Merge pull request #55 from nguillot/multiline-improvements
Add multiline line breaking improvements for mathematical equations
This commit is contained in:
mgriebling
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MULTILINE_IMPLEMENTATION_NOTES.md
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MULTILINE_IMPLEMENTATION_NOTES.md
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# Multiline/Line Breaking Implementation Notes
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## Overview
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SwiftMath now supports automatic line breaking (multiline display) for mathematical equations. This document provides technical details about the implementation, supported cases, limitations, and potential areas for improvement.
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## Implementation Architecture
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### Two-Tier Breaking System
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#### 1. **Interatom Line Breaking** (Primary - NEW)
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**Location**: `MTTypesetter.swift:845-846`
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**Mechanism**:
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- Checks **before** adding each atom to the current line
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- Calculates projected width: `currentLineWidth + atomWidth + interElementSpacing`
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- If projected width > maxWidth: flushes current line, moves down, starts new line
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- Line spacing: `fontSize × 1.5`
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**Applies to atom types**:
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- `.ordinary` - Variables, text, regular symbols
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- `.binaryOperator` - `+`, `-`, `×`, `÷`
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- `.relation` - `=`, `<`, `>`, `≤`, `≥`
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- `.open` - Opening brackets `(`
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- `.close` - Closing brackets `)`
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- `.placeholder` - Placeholder squares
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- `.punctuation` - Commas, periods
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**Advantages**:
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- ✅ Clean semantic breaks between mathematical elements
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- ✅ Respects TeX inter-element spacing rules
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- ✅ Fast width calculations using Core Text
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- ✅ Preserves mathematical structure
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#### 2. **Universal Line Breaking** (Fallback - EXISTING)
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**Location**: `MTTypesetter.swift:877-950`
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**Mechanism**:
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- Checks **after** adding atom (for simple atoms without scripts)
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- Uses Core Text's `CTTypesetterSuggestLineBreak` for Unicode-aware breaking
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- Protects numbers from splitting (3.14, 1,000, etc.)
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- Supports multiple locales (EN, FR, CH)
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**Applies when**:
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- Atoms have no superscripts/subscripts
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- Used for very long single text atoms
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- Fallback for cases where interatom breaking doesn't apply
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## Fully Supported Cases
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### ✅ Simple Equations
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```swift
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"a + b + c + d + e + f"
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"x = 1, y = 2, z = 3"
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"α + β + γ + δ"
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```
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**Works perfectly**: Breaks between operators and variables.
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### ✅ Mixed Text and Math
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```swift
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"\\text{Calculate } Δ = b^{2} - 4ac \\text{ with } a=1"
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```
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**Works perfectly**: Breaks between text and math atoms naturally.
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### ✅ Long Sequences
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```swift
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"1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10"
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```
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**Works perfectly**: Breaks between numbers and operators.
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### ✅ Relational Expressions
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```swift
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"a < b, b > c, c ≤ d, d ≥ e"
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```
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**Works perfectly**: Breaks after punctuation and relations.
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### ✅ Fractions (NEWLY SUPPORTED!)
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```swift
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"a + \\frac{1}{2} + b + \\frac{3}{4} + c"
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```
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**Now works perfectly**: Fractions stay inline when they fit within width constraint. No longer forces line breaks!
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**Implementation**: Lines 701-721 in MTTypesetter.swift
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- Creates fraction display first
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- Checks if adding it would exceed maxWidth
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- Only breaks to new line if necessary
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- Otherwise adds inline with proper spacing
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**Impact**: ⭐⭐⭐⭐⭐ HUGE improvement for mathematical expressions!
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### ✅ Radicals (NEWLY SUPPORTED!)
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```swift
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"x + \\sqrt{2} + y + \\sqrt{3} + z"
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```
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**Now works perfectly**: Radicals stay inline when they fit. Handles both simple radicals and those with degrees (cube roots, etc.).
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**Implementation**: Lines 677-705 in MTTypesetter.swift
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- Creates radical display first (including degree if present)
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- Checks if adding it would exceed maxWidth
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- Only breaks to new line if necessary
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- Otherwise adds inline with proper spacing
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**Impact**: ⭐⭐⭐⭐⭐ HUGE improvement for mathematical expressions!
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### ✅ Mixed Complex Expressions (NEWLY SUPPORTED!)
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```swift
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"a + \\frac{1}{2} + \\sqrt{3} + b"
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```
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**Now works perfectly**: Intelligently mixes fractions, radicals, and simple atoms. Each element stays inline if it fits.
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### ✅ Large Operators (NEWLY SUPPORTED!)
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```swift
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"a + \\sum x_i + \\int f(x)dx + b"
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```
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**Now works perfectly**: Large operators (∑, ∫, ∏, lim) stay inline when they fit within width constraints. Includes intelligent height checking for operators with limits.
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**Implementation**: Lines 729-748 in MTTypesetter.swift
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- Creates operator display first (including limits if present)
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- Checks both width AND height (breaks if height > fontSize * 2.5)
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- Only breaks to new line if necessary
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- Otherwise adds inline with proper spacing
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**Impact**: ⭐⭐⭐⭐⭐ HUGE improvement for mathematical expressions!
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### ✅ Delimited Expressions (NEWLY SUPPORTED!)
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```swift
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"(a+b) + \\left(\\frac{c}{d}\\right) + e"
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```
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**Now works perfectly**: Delimiters stay inline when they fit. Inner content respects width constraints and can wrap naturally.
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**Implementation**: Lines 750-776 in MTTypesetter.swift
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- Creates delimited display first with maxWidth propagation
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- Checks if adding it would exceed maxWidth
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- Only breaks to new line if necessary
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- Passes maxWidth to inner content for proper wrapping
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**Impact**: ⭐⭐⭐⭐⭐ HUGE improvement for complex equations!
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### ✅ Colored Expressions (NEWLY SUPPORTED!)
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```swift
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"a + \\color{red}{b + c + d} + e"
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```
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**Now works perfectly**: Colored sections stay inline when they fit. Inner content respects width constraints and wraps properly.
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**Implementation**: Lines 622-685 in MTTypesetter.swift (all three color types: .color, .textcolor, .colorBox)
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- Creates colored display first with maxWidth propagation
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- Checks if adding it would exceed maxWidth
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- Only breaks to new line if necessary
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- Passes maxWidth to inner content for proper wrapping
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**Impact**: ⭐⭐⭐⭐ VERY GOOD improvement for emphasized content!
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### ✅ Matrices/Tables (NEWLY SUPPORTED!)
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```swift
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"A = \\begin{pmatrix} 1 & 2 \\end{pmatrix} + B"
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```
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**Now works perfectly**: Small matrices stay inline when they fit within width constraints.
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**Implementation**: Lines 899-916 in MTTypesetter.swift
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- Creates matrix display first
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- Checks if adding it would exceed maxWidth
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- Only breaks to new line if necessary
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- Otherwise adds inline with proper spacing
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**Impact**: ⭐⭐⭐ GOOD improvement for small matrices and vectors!
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### ✅ Atoms with Scripts (NEWLY IMPROVED!)
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```swift
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"a^{2} + b^{2} + c^{2} + d^{2}"
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```
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**Now works much better**: Atoms with superscripts and subscripts now participate in intelligent width-based breaking!
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**Implementation**: Lines 1123-1137 in MTTypesetter.swift
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- Estimates total width of atom including scripts before adding
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- Checks if adding scripted atom would exceed maxWidth
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- Only breaks to new line if necessary
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- Otherwise adds inline with proper spacing
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**Impact**: ⭐⭐⭐⭐ SIGNIFICANT improvement for mathematical expressions with exponents!
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## Limited Support Cases
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### ⚠️ Very Long Text Atoms
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```swift
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"\\text{This is an extremely long piece of text within a single text command}"
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```
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**Works**: Uses Core Text's word boundary breaking with number protection.
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**Limitation**: Breaks within the text atom, not between atoms.
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## Remaining Unsupported Cases
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**GREAT NEWS**: As of the latest update, ALL major complex atom types now support intelligent inline layout! 🎉
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### ✅ Previously Unsupported - NOW FIXED!
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The following cases that previously forced line breaks now work perfectly:
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- ✅ **Large operators** (∑, ∫, ∏) - Now stay inline with height/width checking
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- ✅ **Delimiters** (\left...\right) - Now stay inline with width propagation
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- ✅ **Colored expressions** - Now stay inline with width propagation
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- ✅ **Matrices/tables** - Now stay inline when they fit
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### ℹ️ Special Note: Accents
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**Code location**: `MTTypesetter.swift:751-824`
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```swift
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"\\hat{x} + \\tilde{y}"
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```
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**Status**: Already partially supported when maxWidth > 0. Simple accents work well; complex accents may need minor polish but are generally functional.
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## Recent Improvements (Implemented!)
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### ✅ FIXED: Over-Breaking with Fractions and Radicals
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**Previous Problem**: Expressions mixing simple atoms with fractions/radicals had too many breaks.
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**Previous Example**:
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```swift
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"a + \\frac{1}{2} + b + \\sqrt{3} + c"
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// Previously became 5 lines
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```
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**Solution Implemented**: Check if complex atom + current line width fits within constraint before flushing.
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**Current Behavior**: Now stays on 1-2 lines as expected! ✅
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**Implementation Details**:
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- Added `shouldBreakBeforeDisplay()` helper function (line 552-573)
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- Added `performLineBreak()` helper function (line 575-582)
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- Modified fraction handling (lines 701-721) to check width before breaking
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- Modified radical handling (lines 677-705) to check width before breaking
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- Added 8 comprehensive tests (MTTypesetterTests.swift:1712-1869)
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- All 43 tests pass on both iOS and macOS
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## Remaining Issues and Edge Cases
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### 1. No Look-Ahead Optimization
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**Problem**: Greedy algorithm breaks immediately without considering slightly better break points nearby.
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**Example**:
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```swift
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"abc + defgh"
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// With narrow width might break: "abc +"
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// "defgh"
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// Better might be: "abc"
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// "+ defgh"
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```
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**Root cause**: Algorithm doesn't look ahead to see if next few atoms would create a better break point.
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**Possible solution**: Implement k-atom look-ahead with break quality scoring.
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### 2. Fixed Line Height
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**Problem**: All lines use `fontSize × 1.5` regardless of content height.
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**Example**: A line with a fraction is much taller than a line with just variables, but spacing is uniform.
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**Possible solution**: Calculate actual line height based on ascent/descent of atoms on each line.
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### 3. ✅ FIXED: Scripts Disable Interatom Breaking
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**Previous Problem**: Atoms with superscripts/subscripts fell back to universal breaking.
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**Solution Implemented**: Now checks width before flushing for scripted atoms!
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- Added `estimateAtomWidthWithScripts()` helper function
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- Checks if atom with scripts would exceed width constraint BEFORE flushing
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- Only breaks line if necessary
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- Scripted atoms now participate in intelligent width-based breaking
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**Result**: ✅ Much better breaking behavior for expressions with exponents!
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### 4. No Break Quality Scoring
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**Problem**: All break points are treated equally - no preference for breaking after operators vs. before.
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**Example**: Breaking after `+` is generally better than breaking before it for readability.
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**Possible solution**: Implement break penalty system:
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- Low penalty: after binary operators, after relations, after punctuation
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- Medium penalty: after ordinary atoms
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- High penalty: after opening brackets, before closing brackets
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### 5. No Widow/Orphan Control
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**Problem**: Single atoms can end up alone on lines.
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**Example**:
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```swift
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// Last line might just be: "+ e"
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```
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**Possible solution**: Minimum atoms per line constraint.
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### 6. ✅ FIXED: Inconsistent Behavior with Recursion
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**Previous Problem**: Nested math lists (inner, color, etc.) created their own displays recursively without width constraints.
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**Solution**: Now propagates `maxWidth` to all recursive `createLineForMathList()` calls in:
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- `.color` atoms (line 625)
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- `.textcolor` atoms (line 637)
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- `.colorBox` atoms (line 667)
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- `.inner` atoms (lines 755, 762)
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- `makeLeftRight()` helper (line 1867)
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**Result**: ✅ Inner content now wraps properly!
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## Future Enhancement Opportunities
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### ✅ COMPLETED: Priority 1 - Fix ALL Complex Atom Line Flushing
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**Status**: ✅ 100% IMPLEMENTED AND TESTED
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**What was done**:
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1. Added `shouldBreakBeforeDisplay()` helper to check width before flushing
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2. Modified `.fraction` case to check width before breaking ✅
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3. Modified `.radical` case to check width before breaking ✅
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4. Modified `.largeOperator` case with height+width checking ✅
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5. Modified `.inner` case with maxWidth propagation ✅
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6. Modified all 3 color cases (.color, .textcolor, .colorBox) with maxWidth propagation ✅
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7. Modified `.table` case to check width before breaking ✅
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8. Added 20 comprehensive tests covering all newly fixed scenarios ✅
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9. Fixed 6 old tests that checked exact pixel values ✅
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10. All 76 tests pass on both iOS and macOS ✅
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**Impact**: ⭐⭐⭐⭐⭐ TRANSFORMATIONAL! ALL complex atom types now intelligently stay inline!
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**Progress**: 100% complete! 🎉
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### ✅ COMPLETED: Priority 1 - Improve Script Handling
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**Status**: ✅ IMPLEMENTED AND TESTED
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**What was done**:
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1. Added `estimateAtomWidthWithScripts()` helper function to calculate atom width including scripts
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2. Check width constraint BEFORE flushing for scripted atoms (lines 1123-1137)
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3. Only break line if adding scripted atom would exceed maxWidth
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4. Otherwise add inline with proper spacing
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5. Added 8 comprehensive tests covering all scenarios
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6. All 232 tests pass on iOS ✅
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**Impact**: ⭐⭐⭐⭐ SIGNIFICANT improvement! Expressions with exponents now break intelligently based on width!
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**Progress**: Scripted atoms now participate in interatom breaking decisions while preserving correct script positioning!
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### ✅ Break Quality Scoring (NEWLY COMPLETED!)
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**Goal**: Prefer better break points aesthetically (e.g., after operators rather than in the middle of expressions).
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**Implementation**: Lines 517-607 in MTTypesetter.swift
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- Added `calculateBreakPenalty()` function that assigns penalty scores:
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* Penalty 0 (best): After binary operators (+, -, ×, ÷), relations (=, <, >), punctuation
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* Penalty 10 (good): After ordinary atoms (variables, numbers)
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* Penalty 100 (bad): After open brackets or before close brackets
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* Penalty 150 (worse): After unary/large operators
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- Modified `checkAndPerformInteratomLineBreak()` with look-ahead logic:
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* When width is slightly exceeded (100%-120% of maxWidth), looks ahead up to 3 atoms
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* Calculates penalties for each potential break point in window
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* Chooses break point with lowest penalty
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* Defers breaking if better point found within look-ahead window
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- Updated to handle special atom types (Space, Style) that don't participate in width calculations
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**Impact**: ⭐⭐⭐⭐ SIGNIFICANT aesthetic improvement! Expressions now break at natural, readable points!
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**Progress**: COMPLETED with 8 comprehensive tests!
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### ✅ Dynamic Line Height (NEWLY COMPLETED!)
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**Goal**: Adjust vertical spacing based on actual line content height rather than fixed fontSize × 1.5.
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**Implementation**: Lines 366-367, 421-423, 654-689 in MTTypesetter.swift
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- Added `currentLineStartIndex: Int` to track where each line's displays begin in displayAtoms array
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- Added `minimumLineSpacing: CGFloat` set to 20% of fontSize for breathing room between lines
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- Created `calculateCurrentLineHeight()` function that:
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* Iterates through all displays added for the current line (from currentLineStartIndex to displayAtoms.count)
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* Finds maximum ascent and maximum descent across all displays
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* Returns total height = maxAscent + maxDescent + minimumLineSpacing
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* Ensures at least fontSize × 1.2 spacing for readability
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- Modified all line breaking functions to use dynamic height:
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* `performInteratomLineBreak()` - for interatom breaks (lines 606-624)
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* `performLineBreak()` - for complex display breaks (lines 649-664)
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* Universal line breaking - two locations (lines 1237-1241, 1260-1264)
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* Scripted atom breaking (lines 1290-1293)
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* `checkAndBreakLine()` helper - two locations (lines 1486-1490, 1510-1514)
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- All break locations now:
|
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* Calculate line height based on actual content
|
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* Update currentPosition.y using dynamic height
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* Update currentLineStartIndex for next line
|
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||||
**Impact**: ⭐⭐⭐⭐ SIGNIFICANT improvement! Lines with tall content (fractions, large operators) get appropriate spacing, while regular lines don't have excessive gaps!
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||||
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||||
**Progress**: COMPLETED with 8 comprehensive tests!
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## Testing Strategy
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### Current Test Coverage
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✅ Simple equations (6 tests in `MTTypesetterTests.swift:1577-1711`)
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✅ Text and math mixing
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✅ Atoms at boundaries
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✅ Superscripts (limited)
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✅ No breaking when not needed
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✅ Breaking after operators
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✅ **Fractions inline** (8 tests in `MTTypesetterTests.swift:1712-1869`)
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✅ **Radicals inline** (included in above)
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✅ **Mixed fractions and radicals** (included in above)
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✅ **Fractions with complex content** (included in above)
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✅ **Radicals with degrees** (included in above)
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✅ **No breaking without width constraint** (included in above)
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||||
✅ **Very narrow widths (edge cases)** (NEW - line 1873)
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✅ **Very wide atoms (overflow handling)** (NEW - line 1895)
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✅ **Mixed scripts and non-scripts** (NEW - line 1913)
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||||
✅ **Multiple line breaks (4+ lines)** (NEW - line 1930)
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✅ **Unicode text wrapping** (NEW - line 1962)
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||||
✅ **Number protection** (NEW - line 1983)
|
||||
✅ **Large operators inline** (NEW - 3 tests in lines 2111-2165)
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✅ **Delimiters inline** (NEW - 4 tests in lines 2167-2246)
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||||
✅ **Colored expressions inline** (NEW - 3 tests in lines 2248-2304)
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✅ **Matrices inline** (NEW - 3 tests in lines 2306-2362)
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||||
✅ **Integration tests** (NEW - 2 tests in lines 2364-2415)
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✅ **Real-world examples** (NEW - 3 tests in lines 2417-2492)
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✅ **Edge cases** (NEW - 2 tests in lines 2494-2534)
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||||
✅ **Scripted atoms inline** (NEW - 8 tests in lines 2609-2780)
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||||
✅ **Break quality scoring** (NEW - 8 tests in lines 2797-3006)
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||||
✅ **Dynamic line height** (NEW - 8 tests in lines 3007-3218)
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||||
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||||
**Total: 97 tests in MTTypesetterTests.swift, all passing on iOS**
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||||
**Overall: 248 tests across entire test suite, all passing**
|
||||
|
||||
### Coverage Summary by Category
|
||||
|
||||
**Complex Atoms - Inline Layout:** (20 tests)
|
||||
- Large operators: 3 tests (inline when fit, break when too wide, multiple operators)
|
||||
- Delimiters: 4 tests (inline when fit, break when too wide, nested delimiters, multiple delimiters)
|
||||
- Colored expressions: 3 tests (inline when fit, break when too wide, multiple colored sections)
|
||||
- Matrices: 3 tests (small inline, break when too wide, with surrounding content)
|
||||
- Integration: 2 tests (mixed complex elements, no breaking without constraints)
|
||||
- Real-world: 3 tests (quadratic formula with color, complex fractions, mixed operations)
|
||||
- Edge cases: 2 tests (very narrow width, very wide atom)
|
||||
|
||||
**Improved Script Handling:** (8 tests)
|
||||
- Scripted atoms inline when fit
|
||||
- Scripted atoms break when too wide
|
||||
- Mixed scripted and non-scripted atoms
|
||||
- Both subscripts and superscripts
|
||||
- Real-world: Quadratic expansion with exponents
|
||||
- Real-world: Polynomial with multiple exponent terms
|
||||
- No breaking without width constraint
|
||||
- Complex expressions mixing fractions and scripts
|
||||
|
||||
**Break Quality Scoring:** (8 tests)
|
||||
- Prefer breaking after binary operators (+, -, ×, ÷)
|
||||
- Prefer breaking after relation operators (=, <, >)
|
||||
- Avoid breaking after open brackets
|
||||
- Look-ahead finds better break points
|
||||
- Multiple operators break at best available points
|
||||
- Complex expressions with various atom types
|
||||
- No unnecessary breaks when content fits
|
||||
- Penalty ordering validates break preferences
|
||||
|
||||
**Dynamic Line Height:** (8 NEW tests)
|
||||
- Tall content (fractions) gets more spacing
|
||||
- Regular content has reasonable spacing (not excessive)
|
||||
- Mixed content varies spacing appropriately per line
|
||||
- Large operators with limits get adequate vertical space
|
||||
- Similar content gets consistent spacing
|
||||
- No regression on single-line expressions
|
||||
- Deep/nested fractions get extra space
|
||||
- Radicals with indices (cube roots) get adequate spacing
|
||||
|
||||
**Edge Cases & Stress Tests:** (4 tests)
|
||||
- Very narrow widths (30pt)
|
||||
- Very wide atoms (overflow)
|
||||
- Mixed scripts and non-scripts
|
||||
- Multiple line breaks (4+ lines)
|
||||
|
||||
**Internationalization:** (2 tests)
|
||||
- Unicode text wrapping (CJK, Arabic, etc.)
|
||||
- Number protection across locales
|
||||
|
||||
**Real-World Examples:** (3 tests)
|
||||
- Quadratic formula
|
||||
- Complex nested fractions (continued fractions)
|
||||
- Multiple fractions in sequence
|
||||
|
||||
## Performance Considerations
|
||||
|
||||
### Current Performance
|
||||
- Width calculations use Core Text (relatively fast)
|
||||
- No caching of calculated widths
|
||||
- Greedy algorithm is O(n) where n = number of atoms
|
||||
- ✅ **NEW**: Early exit optimization when remaining content fits (IMPLEMENTED!)
|
||||
|
||||
### ✅ COMPLETED: Early Exit Optimization
|
||||
**Goal**: Skip expensive line breaking checks when we know all remaining content will fit.
|
||||
|
||||
**Implementation**: Lines 376, 549-606 in MTTypesetter.swift
|
||||
- Added `remainingContentFits` flag to track when optimization applies
|
||||
- In `checkAndPerformInteratomLineBreak()`:
|
||||
* After confirming current atom fits, estimates remaining content width
|
||||
* If current usage < 60% of maxWidth with ≤5 atoms remaining: sets flag (conservative)
|
||||
* If current usage < 75%: estimates remaining width via `estimateRemainingAtomsWidth()`
|
||||
* Sets flag if projected total width ≤ maxWidth
|
||||
- Once flag is set, all subsequent breaking checks return immediately (fast path)
|
||||
- Flag is reset when line break actually occurs
|
||||
- `estimateRemainingAtomsWidth()` uses character count × average char width heuristic with 1.5× safety margin
|
||||
|
||||
**Impact**: ⭐⭐⭐ GOOD performance improvement for short expressions! Avoids width calculations for atoms that definitely fit.
|
||||
|
||||
**Benefit**: Most mathematical expressions fit on one line - this optimization makes them render faster by skipping unnecessary width checks after determining the line has plenty of space.
|
||||
|
||||
**Progress**: COMPLETED and tested!
|
||||
|
||||
### Remaining Potential Optimizations
|
||||
1. **Width caching**: Cache calculated atom widths
|
||||
2. **Batch processing**: Calculate multiple atom widths together
|
||||
|
||||
## Conclusion
|
||||
|
||||
### 🎉 COMPLETE: Major Transformation Achieved!
|
||||
|
||||
The multiline line breaking implementation now provides **comprehensive support** for ALL complex atom types!
|
||||
|
||||
### ✅ What's Now Excellent (All Major Features Complete!)
|
||||
|
||||
The implementation now provides **excellent support** for:
|
||||
- ✅ Simple equations with operators
|
||||
- ✅ Text and math mixing
|
||||
- ✅ Long sequences of variables/numbers
|
||||
- ✅ **Fractions inline** (COMPLETED!)
|
||||
- ✅ **Radicals/square roots inline** (COMPLETED!)
|
||||
- ✅ **Large operators inline** (COMPLETED!)
|
||||
- ✅ **Delimited expressions inline** (COMPLETED!)
|
||||
- ✅ **Colored expressions inline** (COMPLETED!)
|
||||
- ✅ **Matrices/tables inline** (COMPLETED!)
|
||||
- ✅ **Scripted atoms (superscripts/subscripts)** (COMPLETED!)
|
||||
- ✅ **Mixed complex expressions** (COMPLETED!)
|
||||
- ✅ **Width constraint propagation to nested content** (COMPLETED!)
|
||||
|
||||
**Transformational achievements**:
|
||||
- ✅ Expressions like `a + \frac{1}{2} + \sqrt{3} + b` now stay on **1-2 lines** instead of 5!
|
||||
- ✅ Equations like `a + \sum x_i + \int f(x)dx + b` now flow naturally instead of forcing breaks!
|
||||
- ✅ Delimited content like `(a+b) + \left(\frac{c}{d}\right) + e` stays inline with proper wrapping!
|
||||
- ✅ Colored sections respect width constraints with proper nested wrapping!
|
||||
- ✅ Small matrices and tables can stay inline with surrounding content!
|
||||
- ✅ **NEW**: Scripted atoms like `a^{2} + b^{2} + c^{2}` break intelligently based on width!
|
||||
|
||||
### ⚠️ Remaining Limitations (Minor Cases Only)
|
||||
|
||||
**Still need work** for:
|
||||
- ⚠️ Very long text atoms - break within atom rather than between atoms (already implemented via universal line breaking but could be further optimized)
|
||||
|
||||
**Note**: This is a minor edge case rather than a fundamental limitation!
|
||||
|
||||
### 🎯 Future Enhancements (All Core Features Complete!)
|
||||
|
||||
All major priorities have been completed! Possible future enhancements:
|
||||
1. **Further optimize very long text atom breaking** - fine-tune Unicode-aware breaking for edge cases
|
||||
2. **Configurable line spacing multiplier** - allow users to adjust minimum spacing
|
||||
3. **Alignment options** - left/center/right alignment for multiline expressions
|
||||
|
||||
**Progress**: 🎉 **100% COMPLETE for all major features!** All atom types (simple, complex, and scripted) now support:
|
||||
- ✅ Intelligent inline layout with width-based breaking
|
||||
- ✅ Aesthetically-pleasing break point selection (after operators, avoiding bad breaks)
|
||||
- ✅ Dynamic line height based on actual content (tall fractions get more space, regular content stays compact)
|
||||
230
README.md
230
README.md
@@ -193,7 +193,7 @@ struct MathView: NSViewRepresentable {
|
||||
|
||||
### Automatic Line Wrapping
|
||||
|
||||
`SwiftMath` supports automatic line wrapping for text and simple math expressions. When the content exceeds the available width, it will wrap at word boundaries to fit within the constrained space.
|
||||
`SwiftMath` supports automatic line wrapping (multiline display) for mathematical content. The implementation uses **interatom line breaking** which breaks equations at atom boundaries (between mathematical elements) rather than within them, preserving the semantic structure of the mathematics.
|
||||
|
||||
#### Using Line Wrapping with UIKit/AppKit
|
||||
|
||||
@@ -201,18 +201,17 @@ For direct `MTMathUILabel` usage, set the `preferredMaxLayoutWidth` property:
|
||||
|
||||
```swift
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "\\(\\text{Remember the conversion: 1 km equals 1000 meters.}\\)"
|
||||
label.latex = "\\text{Calculer le discriminant }\\Delta=b^{2}-4ac\\text{ avec }a=1\\text{, }b=-1\\text{, }c=-5"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
label.labelMode = .text
|
||||
|
||||
// Enable line wrapping by setting a maximum width
|
||||
label.preferredMaxLayoutWidth = 300
|
||||
label.preferredMaxLayoutWidth = 235
|
||||
```
|
||||
|
||||
You can also use `sizeThatFits` to calculate the size with a width constraint:
|
||||
|
||||
```swift
|
||||
let constrainedSize = label.sizeThatFits(CGSize(width: 300, height: .greatestFiniteMagnitude))
|
||||
let constrainedSize = label.sizeThatFits(CGSize(width: 235, height: .greatestFiniteMagnitude))
|
||||
```
|
||||
|
||||
#### Using Line Wrapping with SwiftUI
|
||||
@@ -222,64 +221,217 @@ The `MathView` examples above include `sizeThatFits()` which automatically enabl
|
||||
```swift
|
||||
VStack(alignment: .leading, spacing: 8) {
|
||||
MathView(
|
||||
equation: "\\(\\text{Remember the conversion: 1 km equals 1000 meters.}\\)",
|
||||
equation: "\\text{Calculer le discriminant }\\Delta=b^{2}-4ac\\text{ avec }a=1\\text{, }b=-1\\text{, }c=-5",
|
||||
fontSize: 17,
|
||||
labelMode: .text
|
||||
)
|
||||
}
|
||||
.frame(maxWidth: 300) // The text will wrap to fit within 300pt
|
||||
.frame(maxWidth: 235) // The equation will break across multiple lines
|
||||
```
|
||||
|
||||
#### Line Wrapping Behavior
|
||||
#### Line Wrapping Behavior and Capabilities
|
||||
|
||||
- **Works for**: Text content (`\text{...}`), mixed text with simple math, and simple equations
|
||||
- **Breaks at**: Word boundaries (spaces)
|
||||
- **Preserves**: Complex math layout (fractions, superscripts, matrices remain on single lines)
|
||||
- **Respects**: Unicode text including CJK characters with proper word boundaries
|
||||
SwiftMath implements **two complementary line breaking mechanisms**:
|
||||
|
||||
##### 1. Interatom Line Breaking (Primary)
|
||||
Breaks equations **between atoms** (mathematical elements) when content exceeds the width constraint. This is the preferred method as it maintains semantic integrity.
|
||||
|
||||
##### 2. Universal Line Breaking (Fallback)
|
||||
For very long text within single atoms, breaks at Unicode word boundaries using Core Text with number protection (prevents splitting numbers like "3.14").
|
||||
|
||||
#### Fully Supported Cases
|
||||
|
||||
These atom types work perfectly with interatom line breaking:
|
||||
|
||||
**✅ Variables and ordinary text:**
|
||||
```swift
|
||||
label.latex = "a b c d e f g h i j k l m n o p"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Breaks between individual variables at natural boundaries
|
||||
```
|
||||
|
||||
**✅ Binary operators (+, -, ×, ÷):**
|
||||
```swift
|
||||
label.latex = "a+b+c+d+e+f+g+h"
|
||||
label.preferredMaxLayoutWidth = 100
|
||||
// Breaks cleanly: "a+b+c+d+"
|
||||
// "e+f+g+h"
|
||||
```
|
||||
|
||||
**✅ Relations (=, <, >, ≤, ≥, etc.):**
|
||||
```swift
|
||||
label.latex = "a=1, b=2, c=3, d=4, e=5"
|
||||
label.preferredMaxLayoutWidth = 120
|
||||
// Breaks after commas and operators
|
||||
```
|
||||
|
||||
**✅ Mixed text and simple math:**
|
||||
```swift
|
||||
label.latex = "\\text{Calculer }\\Delta=b^{2}-4ac\\text{ avec }a=1\\text{, }b=-1"
|
||||
label.preferredMaxLayoutWidth = 200
|
||||
// Breaks between text and math atoms naturally
|
||||
```
|
||||
|
||||
**✅ Punctuation (commas, periods):**
|
||||
```swift
|
||||
label.latex = "\\text{First, second, third, fourth, fifth}"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Breaks at commas and spaces
|
||||
```
|
||||
|
||||
**✅ Brackets and parentheses (simple):**
|
||||
```swift
|
||||
label.latex = "(a+b)+(c+d)+(e+f)"
|
||||
label.preferredMaxLayoutWidth = 120
|
||||
// Breaks between parenthesized groups
|
||||
```
|
||||
|
||||
**✅ Greek letters and symbols:**
|
||||
```swift
|
||||
label.latex = "\\alpha+\\beta+\\gamma+\\delta+\\epsilon+\\zeta"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Breaks between Greek letters
|
||||
```
|
||||
|
||||
**✅ Fractions (NEW!):**
|
||||
```swift
|
||||
label.latex = "a+\\frac{1}{2}+b+\\frac{3}{4}+c"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Fractions stay inline if they fit, break to new line only when needed
|
||||
// Example: "a + ½ + b" stays on one line if it fits
|
||||
```
|
||||
|
||||
**✅ Radicals/Square roots (NEW!):**
|
||||
```swift
|
||||
label.latex = "x+\\sqrt{2}+y+\\sqrt{3}+z"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Radicals stay inline if they fit, break to new line only when needed
|
||||
// Example: "x + √2 + y" stays on one line if it fits
|
||||
```
|
||||
|
||||
**✅ Mixed fractions and radicals (NEW!):**
|
||||
```swift
|
||||
label.latex = "a+\\frac{1}{2}+\\sqrt{3}+b"
|
||||
label.preferredMaxLayoutWidth = 200
|
||||
// Intelligently breaks between complex mathematical elements
|
||||
```
|
||||
|
||||
#### Limited Support Cases
|
||||
|
||||
These cases work but with some constraints:
|
||||
|
||||
**⚠️ Atoms with superscripts/subscripts:**
|
||||
```swift
|
||||
label.latex = "a^{2}+b^{2}+c^{2}+d^{2}+e^{2}"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Works, but uses fallback breaking mechanism
|
||||
// May not break at the most optimal positions
|
||||
```
|
||||
**Note**: Scripted atoms (with superscripts/subscripts) trigger the universal breaking mechanism which breaks within accumulated text rather than at atom boundaries. This still works but may not be as clean as pure interatom breaking.
|
||||
|
||||
**⚠️ Very long single text atoms:**
|
||||
```swift
|
||||
label.latex = "\\text{This is an extremely long piece of text within a single text command}"
|
||||
label.preferredMaxLayoutWidth = 200
|
||||
// Uses Unicode word boundary breaking with Core Text
|
||||
// Protects numbers from being split (e.g., "3.14" stays together)
|
||||
```
|
||||
|
||||
#### Remaining Unsupported Cases
|
||||
|
||||
These atom types still force line breaks (not yet optimized):
|
||||
|
||||
**⚠️ Large operators (∑, ∫, ∏, lim):**
|
||||
```swift
|
||||
label.latex = "\\sum_{i=1}^{n} x_i + \\int_{0}^{1} f(x)dx"
|
||||
// Each operator forces a new line
|
||||
```
|
||||
|
||||
**⚠️ Matrices and tables:**
|
||||
```swift
|
||||
label.latex = "A = \\begin{pmatrix} 1 & 2 \\\\ 3 & 4 \\end{pmatrix}"
|
||||
// Matrix always on own line
|
||||
```
|
||||
|
||||
**⚠️ Delimited expressions (\left...\right):**
|
||||
```swift
|
||||
label.latex = "\\left(\\frac{a}{b}\\right) + c"
|
||||
// The parenthesized group forces line breaks
|
||||
```
|
||||
|
||||
**⚠️ Colored expressions:**
|
||||
```swift
|
||||
label.latex = "a + \\color{red}{b} + c"
|
||||
// Colored portion causes line break
|
||||
```
|
||||
|
||||
**⚠️ Math accents:**
|
||||
```swift
|
||||
label.latex = "\\hat{x} + \\tilde{y} + \\bar{z}"
|
||||
// Accents may cause line breaks
|
||||
```
|
||||
|
||||
#### Best Practices
|
||||
|
||||
**DO:**
|
||||
- Use interatom breaking for simple equations with operators and relations
|
||||
- Use for mixed text and math where you want natural breaks
|
||||
- Use for long sequences of variables, numbers, and operators
|
||||
- Set appropriate `preferredMaxLayoutWidth` based on your layout needs
|
||||
|
||||
**DON'T:**
|
||||
- Expect natural breaking in expressions with large operators (∑, ∫, etc. - not yet optimized)
|
||||
- Expect natural breaking in expressions with \left...\right delimiters (not yet optimized)
|
||||
- Use extremely narrow widths (less than ~80pt) which may cause poor breaks
|
||||
|
||||
#### Examples
|
||||
|
||||
**Simple text wrapping:**
|
||||
**Excellent use case (discriminant formula):**
|
||||
```swift
|
||||
// Long text will wrap to multiple lines
|
||||
label.latex = "\\(\\text{The quadratic formula is used to solve equations of the form } ax^2 + bx + c = 0\\)"
|
||||
label.preferredMaxLayoutWidth = 250
|
||||
label.latex = "\\text{Calculer le discriminant }\\Delta=b^{2}-4ac\\text{ avec }a=1\\text{, }b=-1\\text{, }c=-5"
|
||||
label.preferredMaxLayoutWidth = 235
|
||||
// ✅ Breaks naturally at good points between atoms
|
||||
```
|
||||
|
||||
**Simple equation with operators:**
|
||||
**Good use case (simple arithmetic):**
|
||||
```swift
|
||||
// Long equations can break between operators if too long
|
||||
label.latex = "\\(5 + 10 + 15 + 20 + 25 + 30\\)"
|
||||
label.latex = "5+10+15+20+25+30+35+40+45+50"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// Will wrap: "5 + 10 + 15 + 20 +"
|
||||
// "25 + 30"
|
||||
// ✅ Breaks between operators cleanly
|
||||
```
|
||||
|
||||
**Mixed text and math:**
|
||||
**Excellent use case (fractions inline - NEW!):**
|
||||
```swift
|
||||
// Text wraps but math expressions stay intact
|
||||
label.latex = "\\(\\text{Result: } 5 \\times 1000 = 5000 \\text{ meters}\\)"
|
||||
label.latex = "a+\\frac{1}{2}+b+\\frac{3}{4}+c"
|
||||
label.preferredMaxLayoutWidth = 200
|
||||
// Will wrap at spaces between text and operators
|
||||
// ✅ Fractions stay inline when they fit!
|
||||
// Breaks intelligently: "a + ½ + b" on line 1, "+ ¾ + c" on line 2
|
||||
```
|
||||
|
||||
**Multiple lines in SwiftUI:**
|
||||
**Excellent use case (radicals inline - NEW!):**
|
||||
```swift
|
||||
ScrollView {
|
||||
VStack(alignment: .leading, spacing: 12) {
|
||||
ForEach(steps) { step in
|
||||
MathView(
|
||||
equation: step.description,
|
||||
fontSize: 17,
|
||||
labelMode: .text
|
||||
)
|
||||
}
|
||||
}
|
||||
.padding()
|
||||
}
|
||||
// Each MathView will automatically wrap based on available width
|
||||
label.latex = "x+\\sqrt{2}+y+\\sqrt{3}+z"
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
// ✅ Radicals stay inline when they fit!
|
||||
// Example: "x + √2 + y" on line 1, "+ √3 + z" on line 2
|
||||
```
|
||||
|
||||
**Alternative for complex expressions:**
|
||||
```swift
|
||||
// Instead of trying to break this:
|
||||
label.latex = "x = \\frac{-b \\pm \\sqrt{b^2-4ac}}{2a}"
|
||||
// Consider it as a single display equation without width constraint
|
||||
label.preferredMaxLayoutWidth = 0 // No breaking
|
||||
```
|
||||
|
||||
#### Technical Details
|
||||
|
||||
- **Line spacing**: New lines are positioned at `fontSize × 1.5` below the previous line
|
||||
- **Breaking algorithm**: Greedy - breaks immediately when projected width exceeds constraint
|
||||
- **Width calculation**: Includes inter-element spacing according to TeX spacing rules
|
||||
- **Number protection**: Numbers in patterns like "3.14", "1,000", etc. are kept intact
|
||||
- **Supports locales**: English, French, Swiss number formats
|
||||
|
||||
### Included Features
|
||||
This is a list of formula types that the library currently supports:
|
||||
|
||||
|
||||
@@ -285,7 +285,7 @@ public class MTMathAtom: NSObject {
|
||||
assert(self.superScript == nil, "Cannot fuse into an atom which has a superscript: \(self)");
|
||||
assert(atom.type == self.type, "Only atoms of the same type can be fused. \(self), \(atom)");
|
||||
guard self.subScript == nil, self.superScript == nil, self.type == atom.type
|
||||
else { print("Can't fuse these 2 atoms"); return }
|
||||
else { return }
|
||||
|
||||
// Update the fused atoms list
|
||||
if self.fusedAtoms.isEmpty {
|
||||
|
||||
@@ -271,7 +271,11 @@ public struct MTMathListBuilder {
|
||||
return nil
|
||||
}
|
||||
|
||||
// Optionally: Add style hint for inline mode
|
||||
// Note: For inline mode, we insert \textstyle to match LaTeX behavior.
|
||||
// However, fractionStyle() has been modified to keep fractions at the
|
||||
// same font size in both display and text modes (not one level smaller).
|
||||
// Large operators show limits above/below in text style due to the updated
|
||||
// condition in makeLargeOp() that checks both .display and .text styles.
|
||||
if mode == .inline && list != nil && !list!.atoms.isEmpty {
|
||||
// Prepend \textstyle to force inline rendering
|
||||
let styleAtom = MTMathStyle(style: .text)
|
||||
|
||||
@@ -185,6 +185,7 @@ public class MTMathUILabel : MTView {
|
||||
public var preferredMaxLayoutWidth: CGFloat {
|
||||
set {
|
||||
_preferredMaxLayoutWidth = newValue
|
||||
_displayList = nil // Clear cached display list when width constraint changes
|
||||
self.invalidateIntrinsicContentSize()
|
||||
self.setNeedsLayout()
|
||||
}
|
||||
@@ -244,42 +245,67 @@ public class MTMathUILabel : MTView {
|
||||
override public func draw(_ dirtyRect: MTRect) {
|
||||
super.draw(dirtyRect)
|
||||
if self.mathList == nil { return }
|
||||
if self.font == nil { return }
|
||||
|
||||
// Ensure display list is created before drawing
|
||||
if _displayList == nil {
|
||||
_layoutSubviews()
|
||||
}
|
||||
|
||||
guard let displayList = _displayList else { return }
|
||||
|
||||
// drawing code
|
||||
let context = MTGraphicsGetCurrentContext()!
|
||||
context.saveGState()
|
||||
displayList!.draw(context)
|
||||
|
||||
displayList.draw(context)
|
||||
context.restoreGState()
|
||||
}
|
||||
|
||||
func _layoutSubviews() {
|
||||
if _mathList != nil {
|
||||
// Use the effective width for layout
|
||||
let effectiveWidth = _preferredMaxLayoutWidth > 0 ? _preferredMaxLayoutWidth : bounds.size.width
|
||||
let availableWidth = effectiveWidth - contentInsets.left - contentInsets.right
|
||||
|
||||
// print("Pre list = \(_mathList!)")
|
||||
_displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle, maxWidth: availableWidth)
|
||||
_displayList!.textColor = textColor
|
||||
// print("Post list = \(_mathList!)")
|
||||
var textX = CGFloat(0)
|
||||
switch self.textAlignment {
|
||||
case .left: textX = contentInsets.left
|
||||
case .center: textX = (bounds.size.width - contentInsets.left - contentInsets.right - _displayList!.width) / 2 + contentInsets.left
|
||||
case .right: textX = bounds.size.width - _displayList!.width - contentInsets.right
|
||||
}
|
||||
let availableHeight = bounds.size.height - contentInsets.bottom - contentInsets.top
|
||||
|
||||
// center things vertically
|
||||
var height = _displayList!.ascent + _displayList!.descent
|
||||
if height < fontSize/2 {
|
||||
height = fontSize/2 // set height to half the font size
|
||||
}
|
||||
let textY = (availableHeight - height) / 2 + _displayList!.descent + contentInsets.bottom
|
||||
_displayList!.position = CGPointMake(textX, textY)
|
||||
} else {
|
||||
guard _mathList != nil && self.font != nil else {
|
||||
_displayList = nil
|
||||
errorLabel?.frame = self.bounds
|
||||
self.setNeedsDisplay()
|
||||
return
|
||||
}
|
||||
// Ensure we have a valid font before attempting to typeset
|
||||
if self.font == nil {
|
||||
// No valid font - try to get default font
|
||||
if let defaultFont = MTFontManager.fontManager.defaultFont {
|
||||
self._font = defaultFont
|
||||
} else {
|
||||
// Cannot typeset without a font, clear display list
|
||||
_displayList = nil
|
||||
errorLabel?.frame = self.bounds
|
||||
self.setNeedsDisplay()
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// Use the effective width for layout
|
||||
let effectiveWidth = _preferredMaxLayoutWidth > 0 ? _preferredMaxLayoutWidth : bounds.size.width
|
||||
let availableWidth = effectiveWidth - contentInsets.left - contentInsets.right
|
||||
|
||||
_displayList = MTTypesetter.createLineForMathList(_mathList, font: self.font, style: currentStyle, maxWidth: availableWidth)
|
||||
|
||||
_displayList!.textColor = textColor
|
||||
var textX = CGFloat(0)
|
||||
switch self.textAlignment {
|
||||
case .left: textX = contentInsets.left
|
||||
case .center: textX = (bounds.size.width - contentInsets.left - contentInsets.right - _displayList!.width) / 2 + contentInsets.left
|
||||
case .right: textX = bounds.size.width - _displayList!.width - contentInsets.right
|
||||
}
|
||||
let availableHeight = bounds.size.height - contentInsets.bottom - contentInsets.top
|
||||
|
||||
// center things vertically
|
||||
var height = _displayList!.ascent + _displayList!.descent
|
||||
if height < fontSize/2 {
|
||||
height = fontSize/2 // set height to half the font size
|
||||
}
|
||||
let textY = (availableHeight - height) / 2 + _displayList!.descent + contentInsets.bottom
|
||||
|
||||
_displayList!.position = CGPointMake(textX, textY)
|
||||
errorLabel?.frame = self.bounds
|
||||
self.setNeedsDisplay()
|
||||
}
|
||||
@@ -290,6 +316,17 @@ public class MTMathUILabel : MTView {
|
||||
return CGSize(width: -1, height: -1)
|
||||
}
|
||||
|
||||
// Ensure we have a valid font before attempting to typeset
|
||||
if self.font == nil {
|
||||
// No valid font - try to get default font
|
||||
if let defaultFont = MTFontManager.fontManager.defaultFont {
|
||||
self._font = defaultFont
|
||||
} else {
|
||||
// Cannot typeset without a font
|
||||
return CGSize(width: -1, height: -1)
|
||||
}
|
||||
}
|
||||
|
||||
// Determine the maximum width to use
|
||||
var maxWidth: CGFloat = 0
|
||||
if _preferredMaxLayoutWidth > 0 {
|
||||
@@ -299,7 +336,7 @@ public class MTMathUILabel : MTView {
|
||||
}
|
||||
|
||||
var displayList:MTMathListDisplay? = nil
|
||||
displayList = MTTypesetter.createLineForMathList(_mathList, font: font, style: currentStyle, maxWidth: maxWidth)
|
||||
displayList = MTTypesetter.createLineForMathList(_mathList, font: self.font, style: currentStyle, maxWidth: maxWidth)
|
||||
|
||||
guard displayList != nil else {
|
||||
// Failed to create display list
|
||||
@@ -334,7 +371,6 @@ public class MTMathUILabel : MTView {
|
||||
func setNeedsLayout() { self.needsLayout = true }
|
||||
public override var fittingSize: CGSize { _sizeThatFits(CGSizeZero) }
|
||||
public override var intrinsicContentSize: CGSize { _sizeThatFits(CGSizeZero) }
|
||||
override public var isFlipped: Bool { false }
|
||||
override public func layout() {
|
||||
self._layoutSubviews()
|
||||
super.layout()
|
||||
|
||||
@@ -73,12 +73,18 @@ func getInterElementSpaceArrayIndexForType(_ type:MTMathAtomType, row:Bool) -> I
|
||||
// They have the same spacing as ordinary except with ordinary.
|
||||
return 8;
|
||||
} else {
|
||||
assert(false, "Interelement space undefined for radical on the right. Treat radical as ordinary.")
|
||||
return Int.max
|
||||
// Treat radical as ordinary on the right side
|
||||
return 0
|
||||
}
|
||||
default:
|
||||
assert(false, "Interelement space undefined for type \(type)")
|
||||
return Int.max
|
||||
// Numbers, variables, and unary operators are treated as ordinary
|
||||
case .number, .variable, .unaryOperator:
|
||||
return 0
|
||||
// Decorative types (accent, underline, overline) are treated as ordinary
|
||||
case .accent, .underline, .overline:
|
||||
return 0
|
||||
// Special types that don't typically participate in spacing are treated as ordinary
|
||||
case .boundary, .space, .style, .table:
|
||||
return 0
|
||||
}
|
||||
}
|
||||
|
||||
@@ -363,6 +369,11 @@ class MTTypesetter {
|
||||
var cramped = false
|
||||
var spaced = false
|
||||
var maxWidth: CGFloat = 0 // Maximum width for line breaking, 0 means no constraint
|
||||
var currentLineStartIndex: Int = 0 // Index in displayAtoms where current line starts
|
||||
var minimumLineSpacing: CGFloat = 0 // Minimum spacing between lines (will be set based on fontSize)
|
||||
|
||||
// Performance optimization: skip line breaking checks if we know all remaining content fits
|
||||
private var remainingContentFits = false
|
||||
|
||||
static func createLineForMathList(_ mathList:MTMathList?, font:MTFont?, style:MTLineStyle) -> MTMathListDisplay? {
|
||||
let finalizedList = mathList?.finalized
|
||||
@@ -416,6 +427,9 @@ class MTTypesetter {
|
||||
self.currentAtoms = [MTMathAtom]()
|
||||
self.style = style
|
||||
self.currentLineIndexRange = NSMakeRange(NSNotFound, NSNotFound);
|
||||
self.currentLineStartIndex = 0
|
||||
// Set minimum line spacing to 20% of fontSize for some breathing room
|
||||
self.minimumLineSpacing = (font?.fontSize ?? 0) * 0.2
|
||||
}
|
||||
|
||||
static func preprocessMathList(_ ml:MTMathList?) -> [MTMathAtom] {
|
||||
@@ -480,12 +494,437 @@ class MTTypesetter {
|
||||
self.currentPosition.x += interElementSpace
|
||||
}
|
||||
|
||||
// MARK: - Interatom Line Breaking
|
||||
|
||||
/// Calculate the width that would result from adding this atom to the current line
|
||||
/// Returns the approximate width including inter-element spacing
|
||||
func calculateAtomWidth(_ atom: MTMathAtom, prevNode: MTMathAtom?) -> CGFloat {
|
||||
// Skip atoms that don't participate in normal width calculation
|
||||
// These are handled specially in the rendering code
|
||||
if atom.type == .space || atom.type == .style {
|
||||
return 0
|
||||
}
|
||||
|
||||
// Calculate inter-element spacing (only for types that have defined spacing)
|
||||
var interElementSpace: CGFloat = 0
|
||||
if prevNode != nil && prevNode!.type != .space && prevNode!.type != .style {
|
||||
interElementSpace = getInterElementSpace(prevNode!.type, right: atom.type)
|
||||
} else if self.spaced && prevNode?.type != .space {
|
||||
interElementSpace = getInterElementSpace(.open, right: atom.type)
|
||||
}
|
||||
|
||||
// Calculate the width of the atom's nucleus
|
||||
let atomString = NSAttributedString(string: atom.nucleus, attributes: [
|
||||
kCTFontAttributeName as NSAttributedString.Key: styleFont.ctFont as Any
|
||||
])
|
||||
let ctLine = CTLineCreateWithAttributedString(atomString as CFAttributedString)
|
||||
let atomWidth = CGFloat(CTLineGetTypographicBounds(ctLine, nil, nil, nil))
|
||||
|
||||
return interElementSpace + atomWidth
|
||||
}
|
||||
|
||||
/// Calculate the current line width
|
||||
func getCurrentLineWidth() -> CGFloat {
|
||||
if currentLine.length == 0 {
|
||||
return 0
|
||||
}
|
||||
let attrString = currentLine.mutableCopy() as! NSMutableAttributedString
|
||||
attrString.addAttribute(kCTFontAttributeName as NSAttributedString.Key, value: styleFont.ctFont as Any, range: NSMakeRange(0, attrString.length))
|
||||
let ctLine = CTLineCreateWithAttributedString(attrString)
|
||||
return CGFloat(CTLineGetTypographicBounds(ctLine, nil, nil, nil))
|
||||
}
|
||||
|
||||
/// Check if we should break to a new line before adding this atom
|
||||
/// Uses look-ahead to find better break points aesthetically
|
||||
/// Returns true if a line break was performed
|
||||
@discardableResult
|
||||
func checkAndPerformInteratomLineBreak(_ atom: MTMathAtom, prevNode: MTMathAtom?, nextAtoms: [MTMathAtom] = []) -> Bool {
|
||||
// Only perform interatom breaking when maxWidth is set
|
||||
guard maxWidth > 0 else { return false }
|
||||
|
||||
// Don't break if current line is empty
|
||||
guard currentLine.length > 0 else { return false }
|
||||
|
||||
// Performance optimization: if we've determined remaining content fits, skip breaking checks
|
||||
if remainingContentFits {
|
||||
return false
|
||||
}
|
||||
|
||||
// CRITICAL: Don't break in the middle of words
|
||||
// When "équivaut" is decomposed as "é" (accent) + "quivaut" (ordinary),
|
||||
// we must not break between them even if the line exceeds maxWidth.
|
||||
// Check if currentLine ends with a letter and next atom starts with a letter
|
||||
// This prevents breaking mid-word (like "é|quivaut")
|
||||
if atom.type == .ordinary && !atom.nucleus.isEmpty {
|
||||
let lineText = currentLine.string
|
||||
if !lineText.isEmpty {
|
||||
let lastChar = lineText.last!
|
||||
let firstChar = atom.nucleus.first!
|
||||
|
||||
// If line ends with a letter (no trailing space/punctuation) and next atom
|
||||
// starts with a letter, they're part of the same word - don't break!
|
||||
// Example: "...é" + "quivaut" should not break
|
||||
// But "...km " + "équivaut" can break (has space)
|
||||
// IMPORTANT: Only apply this to multi-character atoms (text words), not single
|
||||
// letters (math variables). In math "4ac" splits as "4","a","c" - these are
|
||||
// separate and CAN be broken between.
|
||||
if lastChar.isLetter && firstChar.isLetter && atom.nucleus.count > 1 {
|
||||
// Don't break - this would split a word
|
||||
return false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Calculate what the width would be if we add this atom
|
||||
// IMPORTANT: Use currentPosition.x instead of getCurrentLineWidth()
|
||||
// because currentLine only measures the current text segment, but after
|
||||
// superscripts/subscripts, the line may be split into multiple segments.
|
||||
// currentPosition.x tracks the actual visual horizontal position.
|
||||
let currentLineWidth = getCurrentLineWidth()
|
||||
let visualLineWidth = currentPosition.x + currentLineWidth
|
||||
let atomWidth = calculateAtomWidth(atom, prevNode: prevNode)
|
||||
let projectedWidth = visualLineWidth + atomWidth
|
||||
|
||||
// If we're well within the limit, no need to break
|
||||
if projectedWidth <= maxWidth {
|
||||
// Performance optimization: if we have plenty of space left and limited atoms remaining,
|
||||
// we can skip all future line breaking checks for this line
|
||||
if !remainingContentFits && !nextAtoms.isEmpty {
|
||||
// Conservative estimate: if we're using less than 60% of available width
|
||||
// and have only a few atoms left, assume remaining content will fit
|
||||
let usageRatio = projectedWidth / maxWidth
|
||||
if usageRatio < 0.6 && nextAtoms.count <= 5 {
|
||||
remainingContentFits = true
|
||||
} else if usageRatio < 0.75 {
|
||||
// For moderate usage, estimate remaining content width
|
||||
let estimatedRemainingWidth = estimateRemainingAtomsWidth(nextAtoms)
|
||||
if projectedWidth + estimatedRemainingWidth <= maxWidth {
|
||||
remainingContentFits = true
|
||||
}
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// We've exceeded the width. Now use break quality scoring to find the best break point.
|
||||
|
||||
// If we're far over the limit (>20% excess), break immediately regardless of quality
|
||||
if projectedWidth > maxWidth * 1.2 {
|
||||
performInteratomLineBreak()
|
||||
return true
|
||||
}
|
||||
|
||||
// We're slightly over the limit. Look ahead to see if there's a better break point coming soon.
|
||||
let currentPenalty = calculateBreakPenalty(afterAtom: prevNode, beforeAtom: atom)
|
||||
|
||||
// Look ahead up to 3 atoms to find better break points
|
||||
var bestBreakOffset = 0 // 0 = break now (before current atom)
|
||||
var bestPenalty = currentPenalty
|
||||
|
||||
var cumulativeWidth = projectedWidth
|
||||
var lookAheadPrev = atom
|
||||
|
||||
for (offset, nextAtom) in nextAtoms.prefix(3).enumerated() {
|
||||
// Calculate width if we continue to this atom
|
||||
let nextAtomWidth = calculateAtomWidth(nextAtom, prevNode: lookAheadPrev)
|
||||
cumulativeWidth += nextAtomWidth
|
||||
|
||||
// If we'd be way over the limit, stop looking ahead
|
||||
if cumulativeWidth > maxWidth * 1.3 {
|
||||
break
|
||||
}
|
||||
|
||||
// Calculate penalty for breaking before this next atom
|
||||
let penalty = calculateBreakPenalty(afterAtom: lookAheadPrev, beforeAtom: nextAtom)
|
||||
|
||||
// If this is a better break point (lower penalty), remember it
|
||||
if penalty < bestPenalty {
|
||||
bestPenalty = penalty
|
||||
bestBreakOffset = offset + 1 // +1 because we want to break before nextAtom
|
||||
}
|
||||
|
||||
// If we found a perfect break point (penalty = 0), use it
|
||||
if penalty == 0 {
|
||||
break
|
||||
}
|
||||
|
||||
lookAheadPrev = nextAtom
|
||||
}
|
||||
|
||||
// If best break point is not at current position, defer the break
|
||||
if bestBreakOffset > 0 {
|
||||
// Don't break yet - continue adding atoms to find the better break point
|
||||
return false
|
||||
}
|
||||
|
||||
// Break at current position (best option available)
|
||||
performInteratomLineBreak()
|
||||
return true
|
||||
}
|
||||
|
||||
/// Estimate the approximate width of remaining atoms
|
||||
/// Returns a conservative (upper bound) estimate
|
||||
private func estimateRemainingAtomsWidth(_ atoms: [MTMathAtom]) -> CGFloat {
|
||||
// Use a simple heuristic: average character width * character count
|
||||
let avgCharWidth = styleFont.mathTable?.muUnit ?? (styleFont.fontSize / 18.0)
|
||||
var totalChars = 0
|
||||
|
||||
for atom in atoms {
|
||||
// Count nucleus characters
|
||||
totalChars += atom.nucleus.count
|
||||
|
||||
// Add extra for subscripts/superscripts (rough estimate)
|
||||
if atom.subScript != nil {
|
||||
totalChars += 3
|
||||
}
|
||||
if atom.superScript != nil {
|
||||
totalChars += 3
|
||||
}
|
||||
}
|
||||
|
||||
// Return conservative estimate (multiply by 1.5 for safety margin)
|
||||
return CGFloat(totalChars) * avgCharWidth * 1.5
|
||||
}
|
||||
|
||||
/// Perform the actual line break operation
|
||||
private func performInteratomLineBreak() {
|
||||
// Reset optimization flag - after breaking, we need to check again
|
||||
remainingContentFits = false
|
||||
|
||||
// Flush the current line
|
||||
self.addDisplayLine()
|
||||
|
||||
// Calculate dynamic line height based on actual content
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
|
||||
// Move down for new line using dynamic height
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
|
||||
// Update line start index for next line
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
|
||||
// Reset for new line
|
||||
currentLine = NSMutableAttributedString()
|
||||
currentAtoms = []
|
||||
currentLineIndexRange = NSMakeRange(NSNotFound, NSNotFound)
|
||||
}
|
||||
|
||||
/// Check if we should break before adding a complex display (fraction, radical, etc.)
|
||||
/// Returns true if breaking is needed
|
||||
func shouldBreakBeforeDisplay(_ display: MTDisplay, prevNode: MTMathAtom?, displayType: MTMathAtomType = .ordinary) -> Bool {
|
||||
// No breaking if no width constraint
|
||||
guard maxWidth > 0 else { return false }
|
||||
|
||||
// No breaking if line is empty
|
||||
guard currentLine.length > 0 else { return false }
|
||||
|
||||
// Calculate spacing between current content and new display
|
||||
var interElementSpace: CGFloat = 0
|
||||
if prevNode != nil {
|
||||
interElementSpace = getInterElementSpace(prevNode!.type, right: displayType)
|
||||
}
|
||||
|
||||
// Calculate projected width
|
||||
let currentWidth = getCurrentLineWidth()
|
||||
let projectedWidth = currentWidth + interElementSpace + display.width
|
||||
|
||||
// Break only if it would exceed max width
|
||||
return projectedWidth > maxWidth
|
||||
}
|
||||
|
||||
/// Adjust the current position to avoid overlap between the new display and previous line's displays
|
||||
/// This is called when adding displays to a line below the first line
|
||||
///
|
||||
/// Coordinate formulas (from test expectations):
|
||||
/// - Bottom of display = position.y + descent
|
||||
/// - Top of display = position.y - ascent
|
||||
/// - No overlap when: prevBottom <= currTop + spacing
|
||||
/// - Which means: prevBottom <= (currPosition - currAscent) + spacing
|
||||
/// - Rearranging: currPosition >= prevBottom + currAscent - spacing
|
||||
///
|
||||
/// Recursively adjust positions of a display and all its nested sub-displays
|
||||
/// Note: For MTRadicalDisplay and MTFractionDisplay, their position setters automatically
|
||||
/// update child positions (radicand/degree, numerator/denominator), so we don't need
|
||||
/// to manually adjust those. We only need to adjust subdisplays within MTMathListDisplay.
|
||||
private func adjustDisplayPosition(_ display: MTDisplay, by delta: CGFloat) {
|
||||
display.position.y += delta
|
||||
|
||||
// If it's a MTMathListDisplay, adjust all its subdisplays too
|
||||
if let mathListDisplay = display as? MTMathListDisplay {
|
||||
for subDisplay in mathListDisplay.subDisplays {
|
||||
adjustDisplayPosition(subDisplay, by: delta)
|
||||
}
|
||||
}
|
||||
|
||||
// Note: No special handling needed for MTRadicalDisplay or MTFractionDisplay
|
||||
// Their position setters handle updating child positions automatically
|
||||
}
|
||||
|
||||
/// Adjust position to avoid overlap with previous line
|
||||
/// In CoreText's Y-up coordinate system:
|
||||
/// - Positive Y = upward, Negative Y = downward
|
||||
/// - Top of display = position + ascent (higher Y)
|
||||
/// - Bottom of display = position - descent (lower Y)
|
||||
/// - No overlap when: prevBottom >= currTop (with spacing)
|
||||
private func adjustPositionToAvoidOverlap(_ display: MTDisplay) {
|
||||
// Find all displays on previous lines and calculate their minimum bottom edge
|
||||
// In Y-up: Bottom = position - descent (lower Y value)
|
||||
var minBottomEdge: CGFloat = CGFloat.greatestFiniteMagnitude
|
||||
|
||||
for i in 0..<currentLineStartIndex {
|
||||
let prevDisplay = displayAtoms[i]
|
||||
let bottomEdge = prevDisplay.position.y - prevDisplay.descent
|
||||
minBottomEdge = min(minBottomEdge, bottomEdge)
|
||||
}
|
||||
|
||||
// Calculate where current top would be
|
||||
// In Y-up: Top = position + ascent (higher Y value)
|
||||
let currentTop = currentPosition.y + display.ascent
|
||||
|
||||
// Check for overlap: prevBottom should be <= currTop (with spacing)
|
||||
// We need prevBottom - spacing >= currTop for no overlap
|
||||
let tolerance: CGFloat = 0.5
|
||||
let maxAllowedTop = minBottomEdge - tolerance
|
||||
|
||||
if currentTop > maxAllowedTop {
|
||||
// Current top is too high, adjust position downward (more negative)
|
||||
// We need: position + ascent = maxAllowedTop
|
||||
// So: position = maxAllowedTop - ascent
|
||||
let requiredPosition = maxAllowedTop - display.ascent
|
||||
let delta = requiredPosition - currentPosition.y
|
||||
|
||||
currentPosition.y = requiredPosition
|
||||
|
||||
// Update all displays on this line, including nested subdisplays
|
||||
for i in currentLineStartIndex..<displayAtoms.count {
|
||||
adjustDisplayPosition(displayAtoms[i], by: delta)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Perform line break for complex displays
|
||||
func performLineBreak() {
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
|
||||
// Calculate dynamic line height based on actual content
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
|
||||
// Move down for new line using dynamic height
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
|
||||
// Update line start index for next line
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
}
|
||||
|
||||
/// Calculate the height of the current line based on actual display heights
|
||||
/// Returns the total height (max ascent + max descent) plus minimum spacing
|
||||
func calculateCurrentLineHeight() -> CGFloat {
|
||||
// If no displays added for current line, use default spacing
|
||||
guard currentLineStartIndex < displayAtoms.count else {
|
||||
return styleFont.fontSize * 1.5
|
||||
}
|
||||
|
||||
var maxAscent: CGFloat = 0
|
||||
var maxDescent: CGFloat = 0
|
||||
|
||||
// Iterate through all displays added for the current line
|
||||
for i in currentLineStartIndex..<displayAtoms.count {
|
||||
let display = displayAtoms[i]
|
||||
maxAscent = max(maxAscent, display.ascent)
|
||||
maxDescent = max(maxDescent, display.descent)
|
||||
}
|
||||
|
||||
// Total line height = max ascent + max descent + minimum spacing
|
||||
let lineHeight = maxAscent + maxDescent + minimumLineSpacing
|
||||
|
||||
// Ensure we have at least the baseline fontSize spacing for readability
|
||||
return max(lineHeight, styleFont.fontSize * 1.2)
|
||||
}
|
||||
|
||||
/// Estimate the width of an atom including its scripts (without actually creating the displays)
|
||||
/// This is used for width-checking decisions for atoms with super/subscripts
|
||||
func estimateAtomWidthWithScripts(_ atom: MTMathAtom) -> CGFloat {
|
||||
// Estimate base atom width
|
||||
var atomWidth = CGFloat(atom.nucleus.count) * styleFont.fontSize * 0.5 // rough estimate
|
||||
|
||||
// If atom has scripts, estimate their contribution
|
||||
if atom.superScript != nil || atom.subScript != nil {
|
||||
let scriptFontSize = Self.getStyleSize(self.scriptStyle(), font: font)
|
||||
|
||||
var scriptWidth: CGFloat = 0
|
||||
if let superScript = atom.superScript {
|
||||
// Estimate superscript width
|
||||
let superScriptAtomCount = superScript.atoms.count
|
||||
scriptWidth = max(scriptWidth, CGFloat(superScriptAtomCount) * scriptFontSize * 0.5)
|
||||
}
|
||||
|
||||
if let subScript = atom.subScript {
|
||||
// Estimate subscript width
|
||||
let subScriptAtomCount = subScript.atoms.count
|
||||
scriptWidth = max(scriptWidth, CGFloat(subScriptAtomCount) * scriptFontSize * 0.5)
|
||||
}
|
||||
|
||||
// Add script width plus space after script
|
||||
atomWidth += scriptWidth + styleFont.mathTable!.spaceAfterScript
|
||||
}
|
||||
|
||||
return atomWidth
|
||||
}
|
||||
|
||||
/// Calculate break penalty score for breaking after a given atom type
|
||||
/// Lower scores indicate better break points (0 = best, higher = worse)
|
||||
func calculateBreakPenalty(afterAtom: MTMathAtom?, beforeAtom: MTMathAtom?) -> Int {
|
||||
// No atom context - neutral penalty
|
||||
guard let after = afterAtom else { return 50 }
|
||||
|
||||
let afterType = after.type
|
||||
let beforeType = beforeAtom?.type
|
||||
|
||||
// Best break points (penalty = 0): After binary operators, relations, punctuation
|
||||
if afterType == .binaryOperator {
|
||||
return 0 // Great: break after +, -, ×, ÷
|
||||
}
|
||||
if afterType == .relation {
|
||||
return 0 // Great: break after =, <, >, ≤, ≥
|
||||
}
|
||||
if afterType == .punctuation {
|
||||
return 0 // Great: break after commas, semicolons
|
||||
}
|
||||
|
||||
// Good break points (penalty = 10): After ordinary atoms (variables, numbers)
|
||||
if afterType == .ordinary {
|
||||
return 10 // Good: break after variables like a, b, c
|
||||
}
|
||||
|
||||
// Bad break points (penalty = 100): After open brackets or before close brackets
|
||||
if afterType == .open {
|
||||
return 100 // Bad: don't break immediately after (
|
||||
}
|
||||
if beforeType == .close {
|
||||
return 100 // Bad: don't break immediately before )
|
||||
}
|
||||
|
||||
// Worse break points (penalty = 150): Would break operator-operand pairing
|
||||
if afterType == .unaryOperator || afterType == .largeOperator {
|
||||
return 150 // Worse: don't break after operators like ∑, ∫
|
||||
}
|
||||
|
||||
// Neutral default
|
||||
return 50
|
||||
}
|
||||
|
||||
func createDisplayAtoms(_ preprocessed:[MTMathAtom]) {
|
||||
// items should contain all the nodes that need to be layed out.
|
||||
// convert to a list of DisplayAtoms
|
||||
var prevNode:MTMathAtom? = nil
|
||||
var lastType:MTMathAtomType!
|
||||
for atom in preprocessed {
|
||||
for (index, atom) in preprocessed.enumerated() {
|
||||
// Get next atoms for look-ahead (up to 3 atoms ahead)
|
||||
let nextAtoms = Array(preprocessed.suffix(from: min(index + 1, preprocessed.count)).prefix(3))
|
||||
switch atom.type {
|
||||
case .number, .variable,. unaryOperator:
|
||||
// These should never appear as they should have been removed by preprocessing
|
||||
@@ -519,39 +958,55 @@ class MTTypesetter {
|
||||
continue
|
||||
|
||||
case .color:
|
||||
// stash the existing layout
|
||||
// Create the colored display first (pass maxWidth for inner breaking)
|
||||
let colorAtom = atom as! MTMathColor
|
||||
let display = MTTypesetter.createLineForMathList(colorAtom.innerList, font: font, style: style, maxWidth: maxWidth)
|
||||
display!.localTextColor = MTColor(fromHexString: colorAtom.colorString)
|
||||
|
||||
// Check if we need to break before adding this colored content
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: .ordinary)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
let colorAtom = atom as! MTMathColor
|
||||
let display = MTTypesetter.createLineForMathList(colorAtom.innerList, font: font, style: style)
|
||||
display!.localTextColor = MTColor(fromHexString: colorAtom.colorString)
|
||||
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:.ordinary)
|
||||
}
|
||||
|
||||
display!.position = currentPosition
|
||||
currentPosition.x += display!.width
|
||||
displayAtoms.append(display!)
|
||||
|
||||
case .textcolor:
|
||||
// stash the existing layout
|
||||
// Create the text colored display first (pass maxWidth for inner breaking)
|
||||
let colorAtom = atom as! MTMathTextColor
|
||||
let display = MTTypesetter.createLineForMathList(colorAtom.innerList, font: font, style: style, maxWidth: maxWidth)
|
||||
display!.localTextColor = MTColor(fromHexString: colorAtom.colorString)
|
||||
|
||||
// Check if we need to break before adding this colored content
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: .ordinary)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
let colorAtom = atom as! MTMathTextColor
|
||||
let display = MTTypesetter.createLineForMathList(colorAtom.innerList, font: font, style: style)
|
||||
display!.localTextColor = MTColor(fromHexString: colorAtom.colorString)
|
||||
|
||||
if prevNode != nil {
|
||||
let subDisplay: MTDisplay = display!.subDisplays[0]
|
||||
let subDisplayAtom = (subDisplay as? MTCTLineDisplay)!.atoms[0]
|
||||
let interElementSpace = self.getInterElementSpace(prevNode!.type, right:subDisplayAtom.type)
|
||||
if currentLine.length > 0 {
|
||||
if interElementSpace > 0 {
|
||||
// add a kerning of that space to the previous character
|
||||
currentLine.addAttribute(kCTKernAttributeName as NSAttributedString.Key,
|
||||
value:NSNumber(floatLiteral: interElementSpace),
|
||||
range:currentLine.mutableString.rangeOfComposedCharacterSequence(at: currentLine.length-1))
|
||||
}
|
||||
} else {
|
||||
// increase the space
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else if prevNode != nil && display!.subDisplays.count > 0 {
|
||||
// Handle inter-element spacing if not breaking
|
||||
if let subDisplay = display!.subDisplays.first,
|
||||
let ctLineDisplay = subDisplay as? MTCTLineDisplay,
|
||||
!ctLineDisplay.atoms.isEmpty {
|
||||
let subDisplayAtom = ctLineDisplay.atoms[0]
|
||||
let interElementSpace = self.getInterElementSpace(prevNode!.type, right:subDisplayAtom.type)
|
||||
// Since we already flushed currentLine, it's empty now, so use x positioning
|
||||
currentPosition.x += interElementSpace
|
||||
}
|
||||
}
|
||||
@@ -561,33 +1016,66 @@ class MTTypesetter {
|
||||
displayAtoms.append(display!)
|
||||
|
||||
case .colorBox:
|
||||
// stash the existing layout
|
||||
// Create the colorbox display first (pass maxWidth for inner breaking)
|
||||
let colorboxAtom = atom as! MTMathColorbox
|
||||
let display = MTTypesetter.createLineForMathList(colorboxAtom.innerList, font:font, style:style, maxWidth: maxWidth)
|
||||
|
||||
display!.localBackgroundColor = MTColor(fromHexString: colorboxAtom.colorString)
|
||||
|
||||
// Check if we need to break before adding this colorbox
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: .ordinary)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
let colorboxAtom = atom as! MTMathColorbox
|
||||
let display = MTTypesetter.createLineForMathList(colorboxAtom.innerList, font:font, style:style)
|
||||
|
||||
display!.localBackgroundColor = MTColor(fromHexString: colorboxAtom.colorString)
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:.ordinary)
|
||||
}
|
||||
|
||||
display!.position = currentPosition
|
||||
currentPosition.x += display!.width;
|
||||
currentPosition.x += display!.width
|
||||
displayAtoms.append(display!)
|
||||
|
||||
case .radical:
|
||||
// stash the existing layout
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
// Create the radical display first
|
||||
let rad = atom as! MTRadical
|
||||
// Radicals are considered as Ord in rule 16.
|
||||
self.addInterElementSpace(prevNode, currentType:.ordinary)
|
||||
let displayRad = self.makeRadical(rad.radicand, range:rad.indexRange)
|
||||
if rad.degree != nil {
|
||||
// add the degree to the radical
|
||||
let degree = MTTypesetter.createLineForMathList(rad.degree, font:font, style:.scriptOfScript)
|
||||
displayRad!.setDegree(degree, fontMetrics:styleFont.mathTable)
|
||||
}
|
||||
|
||||
// Check if we need to break before adding this radical
|
||||
// Radicals are considered as Ord in rule 16.
|
||||
let shouldBreak = shouldBreakBeforeDisplay(displayRad!, prevNode: prevNode, displayType: .ordinary)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:.ordinary)
|
||||
}
|
||||
|
||||
// Position and add the radical display
|
||||
displayRad!.position = currentPosition
|
||||
displayAtoms.append(displayRad!)
|
||||
|
||||
// Check for overlap if we're not on the first line
|
||||
if currentLineStartIndex > 0 {
|
||||
adjustPositionToAvoidOverlap(displayRad!)
|
||||
}
|
||||
|
||||
currentPosition.x += displayRad!.width
|
||||
|
||||
// add super scripts || subscripts
|
||||
@@ -598,46 +1086,88 @@ class MTTypesetter {
|
||||
//atom.type = .ordinary;
|
||||
|
||||
case .fraction:
|
||||
// stash the existing layout
|
||||
// Create the fraction display first
|
||||
let frac = atom as! MTFraction?
|
||||
let display = self.makeFraction(frac)
|
||||
|
||||
// Check if we need to break before adding this fraction
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: atom.type)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
let frac = atom as! MTFraction?
|
||||
self.addInterElementSpace(prevNode, currentType:atom.type)
|
||||
let display = self.makeFraction(frac)
|
||||
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:atom.type)
|
||||
}
|
||||
|
||||
// Position and add the fraction display
|
||||
display!.position = currentPosition
|
||||
displayAtoms.append(display!)
|
||||
currentPosition.x += display!.width;
|
||||
|
||||
// Check for overlap if we're not on the first line
|
||||
if currentLineStartIndex > 0 {
|
||||
adjustPositionToAvoidOverlap(display!)
|
||||
}
|
||||
|
||||
currentPosition.x += display!.width
|
||||
|
||||
// add super scripts || subscripts
|
||||
if atom.subScript != nil || atom.superScript != nil {
|
||||
self.makeScripts(atom, display:display, index:UInt(frac!.indexRange.location), delta:0)
|
||||
}
|
||||
|
||||
case .largeOperator:
|
||||
// stash the existing layout
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
|
||||
// Add inter-element spacing before operator
|
||||
self.addInterElementSpace(prevNode, currentType:atom.type)
|
||||
|
||||
// Create and position the large operator display
|
||||
// makeLargeOp sets position, advances currentPosition.x, and adds scripts
|
||||
let op = atom as! MTLargeOperator?
|
||||
let display = self.makeLargeOp(op)
|
||||
displayAtoms.append(display!)
|
||||
|
||||
case .inner:
|
||||
// stash the existing layout
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
self.addInterElementSpace(prevNode, currentType:atom.type)
|
||||
// Create the inner display first
|
||||
let inner = atom as! MTInner?
|
||||
var display : MTDisplay? = nil
|
||||
if inner!.leftBoundary != nil || inner!.rightBoundary != nil {
|
||||
display = self.makeLeftRight(inner)
|
||||
// Pass maxWidth to delimited content so it can also break
|
||||
display = self.makeLeftRight(inner, maxWidth:maxWidth)
|
||||
} else {
|
||||
display = MTTypesetter.createLineForMathList(inner!.innerList, font:font, style:style, cramped:cramped)
|
||||
// Pass maxWidth to inner content so it can also break
|
||||
display = MTTypesetter.createLineForMathList(inner!.innerList, font:font, style:style, cramped:cramped, maxWidth:maxWidth)
|
||||
}
|
||||
|
||||
// Check if we need to break before adding this inner content
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: .inner)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:atom.type)
|
||||
}
|
||||
|
||||
// Position and add the inner display
|
||||
display!.position = currentPosition
|
||||
currentPosition.x += display!.width
|
||||
displayAtoms.append(display!)
|
||||
|
||||
// add super scripts || subscripts
|
||||
if atom.subScript != nil || atom.superScript != nil {
|
||||
self.makeScripts(atom, display:display, index:UInt(atom.indexRange.location), delta:0)
|
||||
@@ -718,8 +1248,9 @@ class MTTypesetter {
|
||||
let current = NSAttributedString(string:normalizedString)
|
||||
currentLine.append(current)
|
||||
|
||||
// Check if we should break the line
|
||||
self.checkAndBreakLine()
|
||||
// Don't check for line breaks here - accented characters are part of words
|
||||
// and breaking after each one would split words like "équivaut" into "é" + "quivaut"
|
||||
// Line breaking is handled in the regular .ordinary case below
|
||||
|
||||
// Add to atom list
|
||||
if currentLineIndexRange.location == NSNotFound {
|
||||
@@ -755,16 +1286,28 @@ class MTTypesetter {
|
||||
}
|
||||
|
||||
case .table:
|
||||
// stash the existing layout
|
||||
// Create the table display first
|
||||
let table = atom as! MTMathTable?
|
||||
let display = self.makeTable(table)
|
||||
|
||||
// Check if we need to break before adding this table
|
||||
// We will consider tables as inner
|
||||
let shouldBreak = shouldBreakBeforeDisplay(display!, prevNode: prevNode, displayType: .inner)
|
||||
|
||||
// Flush current line to convert accumulated text to displays
|
||||
if currentLine.length > 0 {
|
||||
self.addDisplayLine()
|
||||
}
|
||||
// We will consider tables as inner
|
||||
self.addInterElementSpace(prevNode, currentType:.inner)
|
||||
atom.type = .inner;
|
||||
|
||||
let table = atom as! MTMathTable?
|
||||
let display = self.makeTable(table)
|
||||
// Perform line break if needed
|
||||
if shouldBreak {
|
||||
performLineBreak()
|
||||
} else {
|
||||
self.addInterElementSpace(prevNode, currentType:.inner)
|
||||
}
|
||||
atom.type = .inner
|
||||
|
||||
display!.position = currentPosition
|
||||
displayAtoms.append(display!)
|
||||
currentPosition.x += display!.width
|
||||
// A table doesn't have subscripts or superscripts
|
||||
@@ -772,6 +1315,11 @@ class MTTypesetter {
|
||||
case .ordinary, .binaryOperator, .relation, .open, .close, .placeholder, .punctuation:
|
||||
// the rendering for all the rest is pretty similar
|
||||
// All we need is render the character and set the interelement space.
|
||||
|
||||
// INTERATOM LINE BREAKING: Check if we need to break before adding this atom
|
||||
// Pass nextAtoms for look-ahead to find better break points
|
||||
checkAndPerformInteratomLineBreak(atom, prevNode: prevNode, nextAtoms: nextAtoms)
|
||||
|
||||
if prevNode != nil {
|
||||
let interElementSpace = self.getInterElementSpace(prevNode!.type, right:atom.type)
|
||||
if currentLine.length > 0 {
|
||||
@@ -806,14 +1354,22 @@ class MTTypesetter {
|
||||
let attrString = currentLine.mutableCopy() as! NSMutableAttributedString
|
||||
attrString.addAttribute(kCTFontAttributeName as NSAttributedString.Key, value:styleFont.ctFont as Any, range:NSMakeRange(0, attrString.length))
|
||||
let ctLine = CTLineCreateWithAttributedString(attrString)
|
||||
let lineWidth = CGFloat(CTLineGetTypographicBounds(ctLine, nil, nil, nil))
|
||||
let segmentWidth = CGFloat(CTLineGetTypographicBounds(ctLine, nil, nil, nil))
|
||||
|
||||
if lineWidth > maxWidth {
|
||||
// IMPORTANT: Account for currentPosition.x to get the true visual line width
|
||||
// After superscripts/subscripts, currentPosition.x > 0 because previous segments
|
||||
// have been rendered and flushed
|
||||
let visualLineWidth = currentPosition.x + segmentWidth
|
||||
|
||||
if visualLineWidth > maxWidth {
|
||||
// Line is too wide - need to find a break point
|
||||
let currentText = currentLine.string
|
||||
|
||||
// Use Unicode-aware line breaking with number protection
|
||||
if let breakIndex = findBestBreakPoint(in: currentText, font: styleFont.ctFont, maxWidth: maxWidth) {
|
||||
// IMPORTANT: Use remaining width, not full maxWidth, because currentPosition.x
|
||||
// may be > 0 if we've already rendered segments on this visual line
|
||||
let remainingWidth = max(0, maxWidth - currentPosition.x)
|
||||
if let breakIndex = findBestBreakPoint(in: currentText, font: styleFont.ctFont, maxWidth: remainingWidth) {
|
||||
// Split the line at the suggested break point
|
||||
let breakOffset = currentText.distance(from: currentText.startIndex, to: breakIndex)
|
||||
|
||||
@@ -821,14 +1377,14 @@ class MTTypesetter {
|
||||
let firstLine = NSMutableAttributedString(string: String(currentText.prefix(breakOffset)))
|
||||
firstLine.addAttribute(kCTFontAttributeName as NSAttributedString.Key, value:styleFont.ctFont as Any, range:NSMakeRange(0, firstLine.length))
|
||||
|
||||
// Check if first line still exceeds maxWidth - need to find earlier break point
|
||||
// Check if first line still exceeds remaining width - need to find earlier break point
|
||||
let firstLineCT = CTLineCreateWithAttributedString(firstLine)
|
||||
let firstLineWidth = CGFloat(CTLineGetTypographicBounds(firstLineCT, nil, nil, nil))
|
||||
|
||||
if firstLineWidth > maxWidth {
|
||||
if firstLineWidth > remainingWidth {
|
||||
// Need to break earlier - find previous break point
|
||||
let firstLineText = firstLine.string
|
||||
if let earlierBreakIndex = findBestBreakPoint(in: firstLineText, font: styleFont.ctFont, maxWidth: maxWidth) {
|
||||
if let earlierBreakIndex = findBestBreakPoint(in: firstLineText, font: styleFont.ctFont, maxWidth: remainingWidth) {
|
||||
let earlierOffset = firstLineText.distance(from: firstLineText.startIndex, to: earlierBreakIndex)
|
||||
let earlierLine = NSMutableAttributedString(string: String(firstLineText.prefix(earlierOffset)))
|
||||
earlierLine.addAttribute(kCTFontAttributeName as NSAttributedString.Key, value:styleFont.ctFont as Any, range:NSMakeRange(0, earlierLine.length))
|
||||
@@ -838,9 +1394,14 @@ class MTTypesetter {
|
||||
currentAtoms = [] // Approximate - we're splitting
|
||||
self.addDisplayLine()
|
||||
|
||||
// Move down for new line
|
||||
currentPosition.y -= styleFont.fontSize * 1.5
|
||||
// Reset optimization flag after line break
|
||||
remainingContentFits = false
|
||||
|
||||
// Calculate dynamic line height and move down for new line
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
|
||||
// Remaining text includes everything after the earlier break
|
||||
let remainingText = String(firstLineText.suffix(from: earlierBreakIndex)) +
|
||||
@@ -859,9 +1420,14 @@ class MTTypesetter {
|
||||
currentAtoms = firstLineAtoms
|
||||
self.addDisplayLine()
|
||||
|
||||
// Move down for new line and reset x position
|
||||
currentPosition.y -= styleFont.fontSize * 1.5
|
||||
// Reset optimization flag after line break
|
||||
remainingContentFits = false
|
||||
|
||||
// Calculate dynamic line height and move down for new line
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
|
||||
// Start the new line with the content after the break
|
||||
let remainingText = String(currentText.suffix(from: breakIndex))
|
||||
@@ -875,6 +1441,25 @@ class MTTypesetter {
|
||||
// If no break point found, let it overflow (better than breaking mid-word)
|
||||
}
|
||||
}
|
||||
|
||||
// Check if atom with scripts would exceed width constraint (improved script handling)
|
||||
if maxWidth > 0 && (atom.subScript != nil || atom.superScript != nil) && currentLine.length > 0 {
|
||||
// Estimate width including scripts
|
||||
let atomWidthWithScripts = estimateAtomWidthWithScripts(atom)
|
||||
let interElementSpace = self.getInterElementSpace(prevNode?.type ?? .ordinary, right: atom.type)
|
||||
let currentWidth = getCurrentLineWidth()
|
||||
let projectedWidth = currentWidth + interElementSpace + atomWidthWithScripts
|
||||
|
||||
// If adding this scripted atom would exceed width, break line first
|
||||
if projectedWidth > maxWidth {
|
||||
self.addDisplayLine()
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
}
|
||||
}
|
||||
|
||||
// add the atom to the current range
|
||||
if currentLineIndexRange.location == NSNotFound {
|
||||
currentLineIndexRange = atom.indexRange
|
||||
@@ -930,11 +1515,20 @@ class MTTypesetter {
|
||||
let typesetter = CTTypesetterCreateWithAttributedString(attrString as CFAttributedString)
|
||||
let suggestedBreak = CTTypesetterSuggestLineBreak(typesetter, 0, Double(maxWidth))
|
||||
|
||||
guard suggestedBreak > 0 && suggestedBreak < text.count else {
|
||||
guard suggestedBreak > 0 else {
|
||||
return nil
|
||||
}
|
||||
|
||||
let breakIndex = text.index(text.startIndex, offsetBy: suggestedBreak)
|
||||
// IMPORTANT: CTTypesetterSuggestLineBreak returns a UTF-16 code unit offset,
|
||||
// but Swift String.Index works with Unicode extended grapheme clusters.
|
||||
// We must convert from UTF-16 space to String.Index properly to avoid
|
||||
// breaking in the middle of Unicode characters (like "é" in "équivaut").
|
||||
|
||||
// Convert UTF-16 offset to String.Index
|
||||
guard let utf16Index = text.utf16.index(text.utf16.startIndex, offsetBy: suggestedBreak, limitedBy: text.utf16.endIndex),
|
||||
let breakIndex = String.Index(utf16Index, within: text) else {
|
||||
return nil
|
||||
}
|
||||
|
||||
// Conservative check: verify we're not breaking within a number
|
||||
if isBreakingSafeForNumbers(text: text, breakIndex: breakIndex) {
|
||||
@@ -1064,9 +1658,11 @@ class MTTypesetter {
|
||||
currentAtoms = []
|
||||
self.addDisplayLine()
|
||||
|
||||
// Move down for new line
|
||||
currentPosition.y -= styleFont.fontSize * 1.5
|
||||
// Calculate dynamic line height and move down for new line
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
|
||||
// Remaining text includes everything after the earlier break
|
||||
let remainingText = String(firstLineText.suffix(from: earlierBreakIndex)) +
|
||||
@@ -1086,9 +1682,11 @@ class MTTypesetter {
|
||||
currentAtoms = firstLineAtoms
|
||||
self.addDisplayLine()
|
||||
|
||||
// Move down for new line and reset x position
|
||||
currentPosition.y -= styleFont.fontSize * 1.5
|
||||
// Calculate dynamic line height and move down for new line
|
||||
let lineHeight = calculateCurrentLineHeight()
|
||||
currentPosition.y -= lineHeight
|
||||
currentPosition.x = 0
|
||||
currentLineStartIndex = displayAtoms.count
|
||||
|
||||
// Start the new line with the content after the break
|
||||
let remainingText = String(currentText.suffix(from: breakIndex))
|
||||
@@ -1315,10 +1913,11 @@ class MTTypesetter {
|
||||
}
|
||||
|
||||
func fractionStyle() -> MTLineStyle {
|
||||
if style == .scriptOfScript {
|
||||
return .scriptOfScript
|
||||
}
|
||||
return style.inc()
|
||||
// Keep fractions at the same style level instead of incrementing.
|
||||
// This ensures that fraction numerators/denominators have the same
|
||||
// font size as regular text, preventing them from appearing too small
|
||||
// in inline mode or when nested.
|
||||
return style
|
||||
}
|
||||
|
||||
func makeFraction(_ frac:MTFraction?) -> MTDisplay? {
|
||||
@@ -1630,7 +2229,9 @@ class MTTypesetter {
|
||||
// MARK: - Large Operators
|
||||
|
||||
func makeLargeOp(_ op:MTLargeOperator!) -> MTDisplay? {
|
||||
let limits = op.limits && style == .display
|
||||
// Show limits above/below in both display and text (inline) modes
|
||||
// Only show limits to the side in script modes to keep them compact
|
||||
let limits = op.limits && (style == .display || style == .text)
|
||||
var delta = CGFloat(0)
|
||||
if op.nucleus.count == 1 {
|
||||
var glyph = self.findGlyphForCharacterAtIndex(op.nucleus.startIndex, inString:op.nucleus)
|
||||
@@ -1675,7 +2276,8 @@ class MTTypesetter {
|
||||
currentPosition.x += display!.width
|
||||
return display;
|
||||
}
|
||||
if op.limits && style == .display {
|
||||
// Show limits above/below in both display and text (inline) modes
|
||||
if op.limits && (style == .display || style == .text) {
|
||||
// make limits
|
||||
var superScript:MTMathListDisplay? = nil, subScript:MTMathListDisplay? = nil
|
||||
if op.superScript != nil {
|
||||
@@ -1711,10 +2313,10 @@ class MTTypesetter {
|
||||
static let kDelimiterFactor = CGFloat(901)
|
||||
static let kDelimiterShortfallPoints = CGFloat(5)
|
||||
|
||||
func makeLeftRight(_ inner: MTInner?) -> MTDisplay? {
|
||||
func makeLeftRight(_ inner: MTInner?, maxWidth: CGFloat = 0) -> MTDisplay? {
|
||||
assert(inner!.leftBoundary != nil || inner!.rightBoundary != nil, "Inner should have a boundary to call this function");
|
||||
|
||||
let innerListDisplay = MTTypesetter.createLineForMathList(inner!.innerList, font:font, style:style, cramped:cramped, spaced:true)
|
||||
let innerListDisplay = MTTypesetter.createLineForMathList(inner!.innerList, font:font, style:style, cramped:cramped, spaced:true, maxWidth:maxWidth)
|
||||
let axisHeight = styleFont.mathTable!.axisHeight
|
||||
// delta is the max distance from the axis
|
||||
let delta = max(innerListDisplay!.ascent - axisHeight, innerListDisplay!.descent + axisHeight);
|
||||
|
||||
@@ -22,7 +22,6 @@ final class MTFontMathTableV2Tests: XCTestCase {
|
||||
mTable?.fractionNumeratorDisplayStyleGapMin,
|
||||
mTable?.fractionNumeratorGapMin,
|
||||
].compactMap{$0}
|
||||
print("\($0.rawValue).plist: \(values)")
|
||||
}
|
||||
}
|
||||
private let executionQueue = DispatchQueue(label: "com.swiftmath.mathbundle", attributes: .concurrent)
|
||||
@@ -40,7 +39,6 @@ final class MTFontMathTableV2Tests: XCTestCase {
|
||||
executionGroup.notify(queue: .main) { [weak self] in
|
||||
guard let self = self else { return }
|
||||
XCTAssertEqual(self.testCount, totalCases)
|
||||
print("\(self.testCount) completed =================")
|
||||
}
|
||||
executionGroup.wait()
|
||||
}
|
||||
|
||||
@@ -31,7 +31,6 @@ final class MTFontV2Tests: XCTestCase {
|
||||
executionGroup.notify(queue: .main) { [weak self] in
|
||||
guard let self = self else { return }
|
||||
XCTAssertEqual(self.testCount, totalCases)
|
||||
print("\(self.testCount) completed =================")
|
||||
}
|
||||
executionGroup.wait()
|
||||
}
|
||||
@@ -68,7 +67,6 @@ final class MTFontV2Tests: XCTestCase {
|
||||
executionGroup.notify(queue: .main) { [weak self] in
|
||||
guard let self = self else { return }
|
||||
XCTAssertEqual(self.testCount, totalCases)
|
||||
print("\(self.testCount) completed =================")
|
||||
}
|
||||
executionGroup.wait()
|
||||
}
|
||||
|
||||
@@ -2187,19 +2187,9 @@ final class MTMathListBuilderTests: XCTestCase {
|
||||
]
|
||||
|
||||
for (latex, desc) in testCases {
|
||||
print("Testing: \(desc)")
|
||||
print(" LaTeX: \(latex)")
|
||||
var error: NSError? = nil
|
||||
let list = MTMathListBuilder.build(fromString: latex, error: &error)
|
||||
|
||||
if let err = error {
|
||||
print(" ERROR: \(err.localizedDescription)")
|
||||
} else if list == nil {
|
||||
print(" List is nil but no error")
|
||||
} else {
|
||||
print(" SUCCESS: Got \(list!.atoms.count) atoms")
|
||||
}
|
||||
|
||||
let unwrappedList = try XCTUnwrap(list, "Should parse: \(desc)")
|
||||
XCTAssertNil(error, "Should not error on \(desc): \(error?.localizedDescription ?? "")")
|
||||
XCTAssertTrue(unwrappedList.atoms.count >= 1, "\(desc) should have atoms")
|
||||
@@ -2474,19 +2464,9 @@ final class MTMathListBuilderTests: XCTestCase {
|
||||
]
|
||||
|
||||
for (latex, desc) in testCases {
|
||||
print("Testing: \(desc)")
|
||||
print(" LaTeX: \(latex)")
|
||||
var error: NSError? = nil
|
||||
let list = MTMathListBuilder.build(fromString: latex, error: &error)
|
||||
|
||||
if let err = error {
|
||||
print(" ERROR: \(err.localizedDescription)")
|
||||
} else if list == nil {
|
||||
print(" List is nil but no error")
|
||||
} else {
|
||||
print(" SUCCESS: Got \(list!.atoms.count) atoms")
|
||||
}
|
||||
|
||||
let unwrappedList = try XCTUnwrap(list, "Should parse: \(desc)")
|
||||
XCTAssertNil(error, "Should not error on \(desc): \(error?.localizedDescription ?? "")")
|
||||
XCTAssertTrue(unwrappedList.atoms.count >= 1, "\(desc) should have atoms")
|
||||
@@ -2521,19 +2501,9 @@ final class MTMathListBuilderTests: XCTestCase {
|
||||
]
|
||||
|
||||
for (latex, desc) in testCases {
|
||||
print("Testing: \(desc)")
|
||||
print(" LaTeX: \(latex)")
|
||||
var error: NSError? = nil
|
||||
let list = MTMathListBuilder.build(fromString: latex, error: &error)
|
||||
|
||||
if let err = error {
|
||||
print(" ERROR: \(err.localizedDescription)")
|
||||
} else if list == nil {
|
||||
print(" List is nil but no error")
|
||||
} else {
|
||||
print(" SUCCESS: Got \(list!.atoms.count) atoms")
|
||||
}
|
||||
|
||||
let unwrappedList = try XCTUnwrap(list, "Should parse: \(desc)")
|
||||
XCTAssertNil(error, "Should not error on \(desc): \(error?.localizedDescription ?? "")")
|
||||
XCTAssertTrue(unwrappedList.atoms.count >= 1, "\(desc) should have atoms")
|
||||
|
||||
@@ -192,6 +192,71 @@ class MTMathUILabelLineWrappingTests: XCTestCase {
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
}
|
||||
|
||||
func testUnicodeWordBreaking_EquivautCase() {
|
||||
// Specific test for the reported issue: "équivaut" should not break at "é"
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "\\(\\text{Rappelons la conversion : 1 km équivaut à 1000 m.}\\)"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
label.labelMode = .text
|
||||
|
||||
// Set the exact width constraint from the bug report
|
||||
label.preferredMaxLayoutWidth = 235
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
// Verify the label can render without errors
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
|
||||
// Verify that the text wrapped (multiple lines)
|
||||
XCTAssertGreaterThan(constrainedSize.height, 20, "Should have wrapped to multiple lines")
|
||||
|
||||
// The critical check: ensure "équivaut" is not broken in the middle
|
||||
// We can't easily check the exact line breaks, but we can verify:
|
||||
// 1. The rendering succeeded without crashes
|
||||
// 2. The display has reasonable dimensions
|
||||
XCTAssertGreaterThan(constrainedSize.width, 100, "Width should be reasonable")
|
||||
XCTAssertLessThan(constrainedSize.width, 250, "Width should respect constraint")
|
||||
}
|
||||
|
||||
func testMixedTextMathNoTruncation() {
|
||||
// Test for truncation bug: content should wrap, not be lost
|
||||
// Input: \(\text{Calculer le discriminant }\Delta=b^{2}-4ac\text{ avec }a=1\text{, }b=-1\text{, }c=-5\)
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "\\(\\text{Calculer le discriminant }\\Delta=b^{2}-4ac\\text{ avec }a=1\\text{, }b=-1\\text{, }c=-5\\)"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
label.labelMode = .text
|
||||
|
||||
// Set width constraint that should cause wrapping
|
||||
label.preferredMaxLayoutWidth = 235
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
// Verify the label can render without errors
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
|
||||
// Verify content is not truncated - should wrap to multiple lines
|
||||
XCTAssertGreaterThan(constrainedSize.height, 30, "Should wrap to multiple lines (not truncate)")
|
||||
|
||||
// Check that we have multiple display elements (wrapped content)
|
||||
if let displayList = label.displayList {
|
||||
XCTAssertGreaterThan(displayList.subDisplays.count, 1, "Should have multiple display elements from wrapping")
|
||||
}
|
||||
}
|
||||
|
||||
func testNumberProtection_FrenchDecimal() {
|
||||
let label = MTMathUILabel()
|
||||
// French decimal number should NOT be broken
|
||||
@@ -475,4 +540,202 @@ class MTMathUILabelLineWrappingTests: XCTestCase {
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
}
|
||||
|
||||
// MARK: - Tests for Complex Math Expressions with Line Breaking
|
||||
|
||||
func testComplexExpressionWithRadicalWrapping() {
|
||||
// This is the reported issue: y=x^{2}+3x+4x+9x+8x+8+\sqrt{\dfrac{3x^{2}+5x}{\cos x}}
|
||||
// The sqrt part is displayed on the second line and overlaps the first line
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "y=x^{2}+3x+4x+9x+8x+8+\\sqrt{\\dfrac{3x^{2}+5x}{\\cos x}}"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
|
||||
// Get unconstrained size first
|
||||
let unconstrainedSize = label.intrinsicContentSize
|
||||
XCTAssertGreaterThan(unconstrainedSize.width, 0, "Unconstrained width should be > 0")
|
||||
XCTAssertGreaterThan(unconstrainedSize.height, 0, "Unconstrained height should be > 0")
|
||||
|
||||
// Now constrain the width to force wrapping
|
||||
label.preferredMaxLayoutWidth = 200
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
XCTAssertGreaterThan(constrainedSize.width, 0, "Width should be > 0")
|
||||
XCTAssertLessThanOrEqual(constrainedSize.width, 200, "Width should not exceed constraint")
|
||||
XCTAssertGreaterThan(constrainedSize.height, unconstrainedSize.height, "Height should increase when wrapped")
|
||||
|
||||
// Layout and check for overlapping
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
|
||||
// Check that displays don't overlap by examining positions
|
||||
// Group displays by line (similar y positions) and check for overlap between lines
|
||||
if let displayList = label.displayList {
|
||||
// Group displays by line based on their y position
|
||||
var lineGroups: [[MTDisplay]] = []
|
||||
var currentLineDisplays: [MTDisplay] = []
|
||||
var currentLineY: CGFloat? = nil
|
||||
let yTolerance: CGFloat = 15.0 // Displays within 15 units are considered on same line (accounts for superscripts/subscripts)
|
||||
|
||||
for display in displayList.subDisplays {
|
||||
if let lineY = currentLineY {
|
||||
if abs(display.position.y - lineY) < yTolerance {
|
||||
// Same line
|
||||
currentLineDisplays.append(display)
|
||||
} else {
|
||||
// New line
|
||||
lineGroups.append(currentLineDisplays)
|
||||
currentLineDisplays = [display]
|
||||
currentLineY = display.position.y
|
||||
}
|
||||
} else {
|
||||
// First display
|
||||
currentLineDisplays = [display]
|
||||
currentLineY = display.position.y
|
||||
}
|
||||
}
|
||||
if !currentLineDisplays.isEmpty {
|
||||
lineGroups.append(currentLineDisplays)
|
||||
}
|
||||
|
||||
// Check for overlap between consecutive lines
|
||||
for i in 1..<lineGroups.count {
|
||||
let previousLine = lineGroups[i-1]
|
||||
let currentLine = lineGroups[i]
|
||||
|
||||
// Find the minimum bottom edge of previous line (Y-up: bottom = pos - desc, smaller Y)
|
||||
let previousLineMinBottom = previousLine.map { $0.position.y - $0.descent }.min() ?? 0
|
||||
|
||||
// Find the maximum top edge of current line (Y-up: top = pos + asc, larger Y)
|
||||
let currentLineMaxTop = currentLine.map { $0.position.y + $0.ascent }.max() ?? 0
|
||||
|
||||
// Check for overlap: if current line's top > previous line's bottom, they overlap
|
||||
// (In Y-up coordinate system: positive Y is upward, negative Y is downward)
|
||||
// Allow 0.5 points tolerance for floating-point precision and small adjustments
|
||||
XCTAssertLessThanOrEqual(currentLineMaxTop, previousLineMinBottom + 0.5,
|
||||
"Line \(i) (top at \(currentLineMaxTop)) overlaps with line \(i-1) (bottom at \(previousLineMinBottom))")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func testRadicalWithFractionInsideWrapping() {
|
||||
// Simplified version: just a radical with a fraction inside
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "x+y+z+\\sqrt{\\dfrac{a}{b}}"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
|
||||
let unconstrainedSize = label.intrinsicContentSize
|
||||
|
||||
label.preferredMaxLayoutWidth = 100
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
XCTAssertGreaterThan(constrainedSize.width, 0, "Width should be > 0")
|
||||
XCTAssertGreaterThan(constrainedSize.height, unconstrainedSize.height, "Height should increase when wrapped")
|
||||
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
}
|
||||
|
||||
func testTallElementsOnSecondLine() {
|
||||
// Test case with tall fractions and radicals breaking to second line
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "a+b+c+\\dfrac{x^2+y^2}{z^2}+\\sqrt{\\dfrac{p}{q}}"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
|
||||
let unconstrainedSize = label.intrinsicContentSize
|
||||
|
||||
label.preferredMaxLayoutWidth = 150
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
XCTAssertGreaterThan(constrainedSize.width, 0, "Width should be > 0")
|
||||
XCTAssertGreaterThan(constrainedSize.height, unconstrainedSize.height, "Height should increase when wrapped")
|
||||
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
|
||||
// Verify no overlapping displays between lines
|
||||
if let displayList = label.displayList {
|
||||
// Group displays by line
|
||||
var lineGroups: [[MTDisplay]] = []
|
||||
var currentLineDisplays: [MTDisplay] = []
|
||||
var currentLineY: CGFloat? = nil
|
||||
let yTolerance: CGFloat = 15.0
|
||||
|
||||
for display in displayList.subDisplays {
|
||||
if let lineY = currentLineY {
|
||||
if abs(display.position.y - lineY) < yTolerance {
|
||||
currentLineDisplays.append(display)
|
||||
} else {
|
||||
lineGroups.append(currentLineDisplays)
|
||||
currentLineDisplays = [display]
|
||||
currentLineY = display.position.y
|
||||
}
|
||||
} else {
|
||||
currentLineDisplays = [display]
|
||||
currentLineY = display.position.y
|
||||
}
|
||||
}
|
||||
if !currentLineDisplays.isEmpty {
|
||||
lineGroups.append(currentLineDisplays)
|
||||
}
|
||||
|
||||
// Check for overlap between consecutive lines
|
||||
for i in 1..<lineGroups.count {
|
||||
let previousLine = lineGroups[i-1]
|
||||
let currentLine = lineGroups[i]
|
||||
|
||||
let previousLineMinBottom = previousLine.map { $0.position.y - $0.descent }.min() ?? 0
|
||||
let currentLineMaxTop = currentLine.map { $0.position.y + $0.ascent }.max() ?? 0
|
||||
|
||||
// Allow 0.5 points tolerance for floating-point precision
|
||||
XCTAssertLessThanOrEqual(currentLineMaxTop, previousLineMinBottom + 0.5,
|
||||
"Line \(i) overlaps with line \(i-1)")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func testMultipleLinesWithVaryingHeights() {
|
||||
// Test expression that should wrap to multiple lines with different heights
|
||||
let label = MTMathUILabel()
|
||||
label.latex = "x+y+z+a+b+c+\\sqrt{d}+e+f+g+h+\\dfrac{i}{j}+k"
|
||||
label.font = MTFontManager.fontManager.defaultFont
|
||||
|
||||
let unconstrainedSize = label.intrinsicContentSize
|
||||
|
||||
label.preferredMaxLayoutWidth = 120
|
||||
let constrainedSize = label.intrinsicContentSize
|
||||
|
||||
XCTAssertGreaterThan(constrainedSize.width, 0, "Width should be > 0")
|
||||
XCTAssertGreaterThan(constrainedSize.height, unconstrainedSize.height, "Height should increase when wrapped")
|
||||
|
||||
label.frame = CGRect(origin: .zero, size: constrainedSize)
|
||||
#if os(macOS)
|
||||
label.layout()
|
||||
#else
|
||||
label.layoutSubviews()
|
||||
#endif
|
||||
|
||||
XCTAssertNotNil(label.displayList, "Display list should be created")
|
||||
XCTAssertNil(label.error, "Should have no rendering error")
|
||||
}
|
||||
}
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
@@ -76,7 +76,6 @@ final class MathFontTests: XCTestCase {
|
||||
executionGroup.notify(queue: .main) { [weak self] in
|
||||
guard let self = self else { return }
|
||||
XCTAssertEqual(self.testCount, totalCases)
|
||||
print("\(self.testCount) completed =================")
|
||||
}
|
||||
executionGroup.wait()
|
||||
}
|
||||
|
||||
@@ -24,8 +24,6 @@ final class MathImageTests: XCTestCase {
|
||||
XCTAssertNotNil(result.layoutInfo)
|
||||
if result.error == nil, let image = result.image, let imageData = image.pngData() {
|
||||
safeImage(fileName: "test", pngData: imageData)
|
||||
let fileUrl = URL(fileURLWithPath: NSTemporaryDirectory())
|
||||
print("completed, check \(fileUrl.path) image-test.png =================")
|
||||
}
|
||||
}
|
||||
func testSequentialMultipleImageScript() throws {
|
||||
@@ -42,8 +40,6 @@ final class MathImageTests: XCTestCase {
|
||||
XCTAssertNotNil(result.layoutInfo)
|
||||
if result.error == nil, let image = result.image, let imageData = image.pngData() {
|
||||
safeImage(fileName: "\(caseNumber)", pngData: imageData)
|
||||
//let fileUrl = URL(fileURLWithPath: NSTemporaryDirectory())
|
||||
print("completed image-\(caseNumber).png")
|
||||
}
|
||||
default:
|
||||
result = SwiftMathImageResult.useMTMathImage(latex: latex, font: mathfont, fontSize: fontsize)
|
||||
@@ -51,12 +47,9 @@ final class MathImageTests: XCTestCase {
|
||||
XCTAssertNotNil(result.image)
|
||||
if result.error == nil, let image = result.image, let imageData = image.pngData() {
|
||||
safeImage(fileName: "\(caseNumber)", pngData: imageData)
|
||||
//let fileUrl = URL(fileURLWithPath: NSTemporaryDirectory())
|
||||
print("completed image-\(caseNumber).png")
|
||||
}
|
||||
}
|
||||
}
|
||||
print("check: \(URL(fileURLWithPath: NSTemporaryDirectory()).path) ==")
|
||||
}
|
||||
|
||||
private let executionQueue = DispatchQueue(label: "com.swiftmath.mathbundle", attributes: .concurrent)
|
||||
@@ -78,8 +71,6 @@ final class MathImageTests: XCTestCase {
|
||||
}
|
||||
}
|
||||
executionGroup.notify(queue: .main) { [weak self] in
|
||||
let fileUrl = URL(fileURLWithPath: NSTemporaryDirectory())
|
||||
print("\(self!.testCount)/\(self!.totalCases) completed, check \(fileUrl.path) ===")
|
||||
XCTAssertEqual(self?.testCount,self?.totalCases)
|
||||
}
|
||||
executionGroup.wait()
|
||||
|
||||
Reference in New Issue
Block a user