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[MTMathListBuilder][MTTypesetter] add \cfrac support

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This commit is contained in:
Nicolas Guillot
2025-09-30 10:17:08 +02:00
parent 225948c725
commit 7c9766f825
3 changed files with 73 additions and 4 deletions
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52
Sources/SwiftMath/MathRender/MTMathListBuilder.swift
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@@ -508,7 +508,14 @@ public struct MTMathListBuilder {
}
if atom.type == .fraction {
if let frac = atom as? MTFraction {
if frac.hasRule {
if frac.isContinuedFraction {
// Generate \cfrac with optional alignment
if frac.alignment != "c" {
str += "\\cfrac[\(frac.alignment)]{\(mathListToString(frac.numerator!))}{\(mathListToString(frac.denominator!))}"
} else {
str += "\\cfrac{\(mathListToString(frac.numerator!))}{\(mathListToString(frac.denominator!))}"
}
} else if frac.hasRule {
str += "\\frac{\(mathListToString(frac.numerator!))}{\(mathListToString(frac.denominator!))}"
} else {
let command: String
@@ -685,6 +692,28 @@ public struct MTMathListBuilder {
} else if command == "frac" {
// A fraction command has 2 arguments
let frac = MTFraction()
frac.numerator = self.buildInternal(true)
frac.denominator = self.buildInternal(true)
return frac;
} else if command == "cfrac" {
// A continued fraction command with optional alignment and 2 arguments
let frac = MTFraction()
frac.isContinuedFraction = true
// Parse optional alignment parameter [l], [r], [c]
skipSpaces()
if hasCharacters && string[currentCharIndex] == "[" {
_ = getNextCharacter() // consume '['
let alignmentChar = getNextCharacter()
if alignmentChar == "l" || alignmentChar == "r" || alignmentChar == "c" {
frac.alignment = String(alignmentChar)
}
// Consume closing ']'
if hasCharacters && string[currentCharIndex] == "]" {
_ = getNextCharacter()
}
}
frac.numerator = self.buildInternal(true)
frac.denominator = self.buildInternal(true)
return frac;
@@ -981,6 +1010,27 @@ public struct MTMathListBuilder {
return accent
} else if command == "frac" {
let frac = MTFraction()
frac.numerator = self.buildInternal(true)
frac.denominator = self.buildInternal(true)
return frac
} else if command == "cfrac" {
let frac = MTFraction()
frac.isContinuedFraction = true
// Parse optional alignment parameter [l], [r], [c]
skipSpaces()
if hasCharacters && string[currentCharIndex] == "[" {
_ = getNextCharacter() // consume '['
let alignmentChar = getNextCharacter()
if alignmentChar == "l" || alignmentChar == "r" || alignmentChar == "c" {
frac.alignment = String(alignmentChar)
}
// Consume closing ']'
if hasCharacters && string[currentCharIndex] == "]" {
_ = getNextCharacter()
}
}
frac.numerator = self.buildInternal(true)
frac.denominator = self.buildInternal(true)
return frac