Added mathFonts bundle and initial code translation to test MTTypesetter.

Package.swift

@@ -2,6 +2,7 @@
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription
+import CoreGraphics
 
 let package = Package(
     name: "SwiftMathRender",
@@ -20,7 +21,10 @@ let package = Package(
         // Targets can depend on other targets in this package, and on products in packages this package depends on.
         .target(
             name: "SwiftMathRender",
-            dependencies: []),
+            dependencies: [],
+            resources: [
+                .copy("mathFonts.bundle")
+            ]),
         .testTarget(
             name: "SwiftMathRenderTests",
             dependencies: ["SwiftMathRender"]),

Sources/SwiftMathRender/MathRender/MTFont.swift

@@ -33,12 +33,12 @@ public class MTFont {
         // In particular it does not have the math italic characters which breaks our variable rendering.
         // So we first load a CGFont from the file and then convert it to a CTFont.
         self.init()
-        print("Loading font %@", name);
+        print("Loading font \(name)")
         let bundle = MTFont.fontBundle
         let fontPath = bundle.path(forResource: name, ofType: "otf")
         let fontDataProvider = CGDataProvider(filename: fontPath!)
         self.defaultCGFont = CGFont(fontDataProvider!)!
-        print("Num glyphs: %zd", self.defaultCGFont.numberOfGlyphs)
+        print("Num glyphs: \(self.defaultCGFont.numberOfGlyphs)")
         
         self.ctFont = CTFontCreateWithGraphicsFont(self.defaultCGFont, size, nil, nil);
         
@@ -50,7 +50,8 @@ public class MTFont {
     
     static var fontBundle:Bundle {
         // Uses bundle for class so that this can be access by the unit tests.
-        return Bundle(url: Bundle(for: self).url(forResource: "iosMathFonts", withExtension: "bundle")!)!
+        let url = Bundle.module.url(forResource: "mathFonts", withExtension: "bundle")!
+        return Bundle(url: url)!
     }
     
     func copy(withSize size: CGFloat) -> MTFont {

Sources/SwiftMathRender/MathRender/MTMathAtomFactory.swift

@@ -120,6 +120,11 @@ public class MTMathAtomFactory {
         return _accentValueToName!
     }
     
+    static var supportedLatexSymbolNames:[String] {
+        let commands = MTMathAtomFactory.supportedLatexSymbols
+        return commands.keys.map { String($0) }
+    }
+    
     static var supportedLatexSymbols: [String: MTMathAtom] = [
         "square" : MTMathAtomFactory.placeholder(),
         
@@ -663,13 +668,21 @@ public class MTMathAtomFactory {
     /** Returns a fraction with the given numerator and denominator. */
     public static func fraction(withNumerator num: MTMathList, denominator denom: MTMathList) -> MTFraction {
         let frac = MTFraction()
-        
         frac.numerator = num
         frac.denominator = denom
-        
         return frac
     }
     
+    public static func mathListForCharacters(_ chars:String) -> MTMathList? {
+        let list = MTMathList()
+        for ch in chars {
+            if let atom = self.atom(forCharacter: ch) {
+                list.add(atom)
+            }
+        }
+        return list
+    }
+    
     /** Simplification of above function when numerator and denominator are simple strings.
      This function uses `mathListForCharacters` to convert the strings to `MTMathList`s. */
     public static func fraction(withNumeratorString numStr: String, denominatorString denomStr: String) -> MTFraction {

Sources/SwiftMathRender/MathRender/MTMathList.swift

@@ -8,8 +8,9 @@
 import Foundation
 
 // type defines spacing and how it is rendered
-public enum MTMathAtomType: String, CustomStringConvertible {
-    case ordinary // number or text
+public enum MTMathAtomType: Int, CustomStringConvertible, Comparable {
+ 
+    case ordinary = 1 // number or text
     case number     // number
     case variable // text in italic
     case largeOperator // sin/cos, integral
@@ -28,15 +29,15 @@ public enum MTMathAtomType: String, CustomStringConvertible {
     case accent // accented atom
     
     // these atoms do not support subscripts/superscripts:
-    case boundary
-    case space
+    case boundary = 101
+    case space = 201
     
     // Denotes style changes during randering
     case style
     case color
     case colorBox
     
-    case table
+    case table = 1001
     
     func isNotBinaryOperator() -> Bool {
         switch self {
@@ -51,10 +52,40 @@ public enum MTMathAtomType: String, CustomStringConvertible {
     
     // we want string representations to be capitalized
     public var description: String {
-        self.rawValue.capitalized
+        switch self {
+            case .ordinary:       return "Ordinary"
+            case .number:         return "Number"
+            case .variable:       return "Variable"
+            case .largeOperator:  return "Large Operator"
+            case .binaryOperator: return "Binary Operator"
+            case .unaryOperator:  return "Unary Operator"
+            case .relation:       return "Relation"
+            case .open:           return "Open"
+            case .close:          return "Close"
+            case .fraction:       return "Fraction"
+            case .radical:        return "Radical"
+            case .punctuation:    return "Punctuation"
+            case .placeholder:    return "Placeholder"
+            case .inner:          return "Inner"
+            case .underline:      return "Underline"
+            case .overline:       return "Overline"
+            case .accent:         return "Accent"
+            case .boundary:       return "Boundary"
+            case .space:          return "Space"
+            case .style:          return "Style"
+            case .color:          return "Color"
+            case .colorBox:       return "Colorbox"
+            case .table:          return "Table"
         }
     }
     
+    // comparable support
+    public static func < (lhs: MTMathAtomType, rhs: MTMathAtomType) -> Bool {
+        lhs.rawValue < rhs.rawValue
+    }
+    
+}
+
 public enum MTFontStyle:Int {
     /// The default latex rendering style. i.e. variables are italic and numbers are roman.
     case defaultStyle = 0,

Sources/SwiftMathRender/MathRender/MTTypesetter.swift

@@ -378,7 +378,11 @@ class MTTypesetter {
     var currentLine:NSMutableAttributedString!
     var currentAtoms = [MTMathAtom]()   // List of atoms that make the line
     var currentLineIndexRange = NSMakeRange(0, 0)
-    var style:MTLineStyle = .display
+    var style:MTLineStyle {
+        didSet {
+            self.styleFont = self.font.copy(withSize: Self.getStyleSize(self.style, font: self.font))
+        }
+    }
     var styleFont:MTFont!
     var cramped = false
     var spaced = false
@@ -472,11 +476,6 @@ class MTTypesetter {
         }
     }
     
-    func setStyle(_ style:MTLineStyle) {
-        self.style = style
-        self.styleFont = self.font.copy(withSize: Self.getStyleSize(self.style, font: self.font))   //copyFontWithSize:[self.class] getStyleSize:style font:font])
-    }
-    
     func addInterElementSpace(_ prevNode:MTMathAtom?, currentType type:MTMathAtomType) {
         var interElementSpace = CGFloat(0)
         if prevNode != nil {
@@ -754,7 +753,7 @@ class MTTypesetter {
         if (currentLine.length > 0) {
             self.addDisplayLine()
         }
-        if spaced && !lastType.rawValue.isEmpty {
+        if spaced {
             // If spaced then add an interelement space between the last type and close
             let display = displayAtoms.last
             let interElementSpace = self.getInterElementSpace(lastType, right:.close)

Sources/SwiftMathRender/SwiftMathRender.swift

@@ -1,6 +0,0 @@
-public struct SwiftMathRender {
-    public private(set) var text = "Hello, World!"
-
-    public init() {
-    }
-}