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Added Markdown link and backslash escape support #24

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Nov 8, 2017
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32 changes: 32 additions & 0 deletions Marker/Marker.xcodeproj/project.pbxproj
Original file line number Diff line number Diff line change
Expand Up @@ -50,8 +50,20 @@
27C4E61B1ED5ED6500DDE387 /* TextTransform.swift in Sources */ = {isa = PBXBuildFile; fileRef = 271C85B51ED4E2B700F8BBBB /* TextTransform.swift */; };
27C4E61C1ED5ED6900DDE387 /* Marker.h in Headers */ = {isa = PBXBuildFile; fileRef = 271C858D1ED4E2A000F8BBBB /* Marker.h */; settings = {ATTRIBUTES = (Public, ); }; };
27C4E61D1ED5ED6C00DDE387 /* Marker.h in Headers */ = {isa = PBXBuildFile; fileRef = 271C858D1ED4E2A000F8BBBB /* Marker.h */; settings = {ATTRIBUTES = (Public, ); }; };
480104771FA1355F00F20FF8 /* Rule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104741FA1355F00F20FF8 /* Rule.swift */; };
480104781FA1355F00F20FF8 /* Rule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104741FA1355F00F20FF8 /* Rule.swift */; };
480104791FA1355F00F20FF8 /* Rule.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104741FA1355F00F20FF8 /* Rule.swift */; };
4801047A1FA1355F00F20FF8 /* TokenParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104751FA1355F00F20FF8 /* TokenParser.swift */; };
4801047B1FA1355F00F20FF8 /* TokenParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104751FA1355F00F20FF8 /* TokenParser.swift */; };
4801047C1FA1355F00F20FF8 /* TokenParser.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104751FA1355F00F20FF8 /* TokenParser.swift */; };
4801047D1FA1355F00F20FF8 /* Token.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104761FA1355F00F20FF8 /* Token.swift */; };
4801047E1FA1355F00F20FF8 /* Token.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104761FA1355F00F20FF8 /* Token.swift */; };
4801047F1FA1355F00F20FF8 /* Token.swift in Sources */ = {isa = PBXBuildFile; fileRef = 480104761FA1355F00F20FF8 /* Token.swift */; };
480C7A5F1F15832A0094E4EA /* ParserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 271C85C81ED4E37700F8BBBB /* ParserTests.swift */; };
480C7A601F15832A0094E4EA /* ParserTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 271C85C81ED4E37700F8BBBB /* ParserTests.swift */; };
481303A01FA3BA7C001F1DF1 /* String+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4813039F1FA3BA7C001F1DF1 /* String+Extensions.swift */; };
481303A11FA3BC64001F1DF1 /* String+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4813039F1FA3BA7C001F1DF1 /* String+Extensions.swift */; };
481303A21FA3BC65001F1DF1 /* String+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 4813039F1FA3BA7C001F1DF1 /* String+Extensions.swift */; };
484053B21F72EA6000626C55 /* UIButtonExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 484053A21F72EA4F00626C55 /* UIButtonExtension.swift */; };
484053B31F72EA6000626C55 /* Color.swift in Sources */ = {isa = PBXBuildFile; fileRef = 484053A41F72EA4F00626C55 /* Color.swift */; };
484053B41F72EA6000626C55 /* Font.swift in Sources */ = {isa = PBXBuildFile; fileRef = 484053A61F72EA4F00626C55 /* Font.swift */; };
Expand Down Expand Up @@ -140,6 +152,10 @@
27C4E5CF1ED5ED2400DDE387 /* Marker-tvOSTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "Marker-tvOSTests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
27C4E5E31ED5ED3000DDE387 /* Marker.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Marker.framework; sourceTree = BUILT_PRODUCTS_DIR; };
27C4E5EB1ED5ED3100DDE387 /* Marker-macOSTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "Marker-macOSTests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
480104741FA1355F00F20FF8 /* Rule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Rule.swift; sourceTree = "<group>"; };
480104751FA1355F00F20FF8 /* TokenParser.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TokenParser.swift; sourceTree = "<group>"; };
480104761FA1355F00F20FF8 /* Token.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = Token.swift; sourceTree = "<group>"; };
4813039F1FA3BA7C001F1DF1 /* String+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "String+Extensions.swift"; sourceTree = "<group>"; };
484053A11F72EA4F00626C55 /* NSButtonExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NSButtonExtension.swift; sourceTree = "<group>"; };
484053A21F72EA4F00626C55 /* UIButtonExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIButtonExtension.swift; sourceTree = "<group>"; };
484053A41F72EA4F00626C55 /* Color.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Color.swift; sourceTree = "<group>"; };
Expand Down Expand Up @@ -268,9 +284,13 @@
271C85AD1ED4E2B700F8BBBB /* ElementParser.swift */,
271C85AE1ED4E2B700F8BBBB /* MarkdownElement.swift */,
271C85AF1ED4E2B700F8BBBB /* MarkdownParser.swift */,
480104741FA1355F00F20FF8 /* Rule.swift */,
4813039F1FA3BA7C001F1DF1 /* String+Extensions.swift */,
271C85B01ED4E2B700F8BBBB /* Symbol.swift */,
271C85B11ED4E2B700F8BBBB /* Tag.swift */,
271C85B21ED4E2B700F8BBBB /* TagParser.swift */,
480104761FA1355F00F20FF8 /* Token.swift */,
480104751FA1355F00F20FF8 /* TokenParser.swift */,
);
path = Parser;
sourceTree = "<group>";
Expand Down Expand Up @@ -613,14 +633,18 @@
buildActionMask = 2147483647;
files = (
271C85C51ED4E2B700F8BBBB /* TextStyle.swift in Sources */,
4801047D1FA1355F00F20FF8 /* Token.swift in Sources */,
48F232751F1FB7B600E86D5D /* TextTransform+Extensions.swift in Sources */,
271C85C01ED4E2B700F8BBBB /* MarkdownParser.swift in Sources */,
484053B81F72EA6000626C55 /* UITextFieldExtension.swift in Sources */,
484053B31F72EA6000626C55 /* Color.swift in Sources */,
480104771FA1355F00F20FF8 /* Rule.swift in Sources */,
271C85BB1ED4E2B700F8BBBB /* Markup.swift in Sources */,
271C85BD1ED4E2B700F8BBBB /* Element.swift in Sources */,
271C85BF1ED4E2B700F8BBBB /* MarkdownElement.swift in Sources */,
271C85C31ED4E2B700F8BBBB /* TagParser.swift in Sources */,
4801047A1FA1355F00F20FF8 /* TokenParser.swift in Sources */,
481303A01FA3BA7C001F1DF1 /* String+Extensions.swift in Sources */,
48F232801F1FBA7800E86D5D /* TextStyle+Extensions.swift in Sources */,
484053B21F72EA6000626C55 /* UIButtonExtension.swift in Sources */,
484053BA1F72EA6000626C55 /* UITextViewExtension.swift in Sources */,
Expand Down Expand Up @@ -653,16 +677,20 @@
buildActionMask = 2147483647;
files = (
27C4E6091ED5ED6400DDE387 /* TextStyle.swift in Sources */,
4801047E1FA1355F00F20FF8 /* Token.swift in Sources */,
48F232761F1FB7B600E86D5D /* TextTransform+Extensions.swift in Sources */,
27C4E6041ED5ED6400DDE387 /* MarkdownParser.swift in Sources */,
484053C21F72EA6000626C55 /* UITextFieldExtension.swift in Sources */,
484053BD1F72EA6000626C55 /* Color.swift in Sources */,
480104781FA1355F00F20FF8 /* Rule.swift in Sources */,
27C4E5FF1ED5ED6400DDE387 /* Markup.swift in Sources */,
484053CF1F72EA7A00626C55 /* UIButtonExtension.swift in Sources */,
27C4E6011ED5ED6400DDE387 /* Element.swift in Sources */,
27C4E6031ED5ED6400DDE387 /* MarkdownElement.swift in Sources */,
4801047B1FA1355F00F20FF8 /* TokenParser.swift in Sources */,
27C4E6071ED5ED6400DDE387 /* TagParser.swift in Sources */,
48F232811F1FBA7800E86D5D /* TextStyle+Extensions.swift in Sources */,
481303A11FA3BC64001F1DF1 /* String+Extensions.swift in Sources */,
484053C41F72EA6000626C55 /* UITextViewExtension.swift in Sources */,
484053C01F72EA6000626C55 /* LineBreakMode.swift in Sources */,
27C4E6051ED5ED6400DDE387 /* Symbol.swift in Sources */,
Expand Down Expand Up @@ -695,6 +723,8 @@
27C4E61A1ED5ED6500DDE387 /* TextStyle.swift in Sources */,
484053C51F72EA6100626C55 /* NSButtonExtension.swift in Sources */,
48F232821F1FBA7800E86D5D /* TextStyle+Extensions.swift in Sources */,
4801047C1FA1355F00F20FF8 /* TokenParser.swift in Sources */,
480104791FA1355F00F20FF8 /* Rule.swift in Sources */,
27C4E6151ED5ED6500DDE387 /* MarkdownParser.swift in Sources */,
484053C71F72EA6100626C55 /* Color.swift in Sources */,
48F232771F1FB7B600E86D5D /* TextTransform+Extensions.swift in Sources */,
Expand All @@ -705,6 +735,8 @@
27C4E6141ED5ED6500DDE387 /* MarkdownElement.swift in Sources */,
27C4E6181ED5ED6500DDE387 /* TagParser.swift in Sources */,
484053CA1F72EA6100626C55 /* LineBreakMode.swift in Sources */,
481303A21FA3BC65001F1DF1 /* String+Extensions.swift in Sources */,
4801047F1FA1355F00F20FF8 /* Token.swift in Sources */,
27C4E6161ED5ED6500DDE387 /* Symbol.swift in Sources */,
27C4E6131ED5ED6500DDE387 /* ElementParser.swift in Sources */,
27C4E60B1ED5ED6500DDE387 /* Marker.swift in Sources */,
Expand Down
65 changes: 35 additions & 30 deletions Marker/Marker/Marker.swift
Original file line number Diff line number Diff line change
Expand Up @@ -64,40 +64,39 @@ public func parsedMarkdownString(from markdownText: String,

elements.forEach { (element) in
var font: Font? = nil
var strikethroughStyle: NSUnderlineStyle? = nil
var underlineStyle: NSUnderlineStyle? = nil

switch element {
case .em(_):
case .em:
font = textStyle.emFont
case .strong(_):
case .strong:
font = textStyle.strongFont
case .strikethrough(_):
strikethroughStyle = textStyle.strikethroughStyle
case .underline(_):
underlineStyle = textStyle.underlineStyle
}

if let font = font {
attributedString.addAttributes([AttributedStringKey.font: font], range: NSRange(element.range, in: parsedString))
}

if let strikethroughStyle = strikethroughStyle {
attributedString.addAttributes([AttributedStringKey.strikethroughStyle: strikethroughStyle.rawValue],
range: NSRange(element.range, in: parsedString))

case .strikethrough(let range):
if let strikethroughStyle = textStyle.strikethroughStyle {
attributedString.addAttributes([AttributedStringKey.strikethroughStyle: strikethroughStyle.rawValue],
range: NSRange(range, in: parsedString))
}
if let strikethroughColor = textStyle.strikethroughColor {
attributedString.addAttributes([AttributedStringKey.strikethroughColor: strikethroughColor],
range: NSRange(element.range, in: parsedString))
range: NSRange(range, in: parsedString))
}
case .underline(let range):
if let underlineStyle = textStyle.underlineStyle {
attributedString.addAttributes([AttributedStringKey.underlineStyle: underlineStyle.rawValue],
range: NSRange(range, in: parsedString))
}
}

if let underlineStyle = underlineStyle {
attributedString.addAttributes([AttributedStringKey.underlineStyle: underlineStyle.rawValue], range: NSRange(element.range, in: parsedString))

if let underlineColor = textStyle.underlineColor {
attributedString.addAttributes([AttributedStringKey.underlineColor: underlineColor], range: NSRange(element.range, in: parsedString))
attributedString.addAttributes([AttributedStringKey.underlineColor: underlineColor],
range: NSRange(range, in: parsedString))
}
case .link(let range, let urlString):
attributedString.addAttribute(AttributedStringKey.link,
value: urlString,
range: NSRange(range, in: parsedString))
}

if let font = font {
attributedString.addAttributes([AttributedStringKey.font: font],
range: NSRange(element.range, in: parsedString))
}
}

Expand All @@ -119,17 +118,23 @@ public func parsedMarkupString(from text: String,
return NSAttributedString(string: text, textStyle: textStyle)
}

let (parsedString, elements) = try ElementParser.parse(text, for: markups.map { Symbol(character: $0.0) })

let markupRules = Dictionary(
uniqueKeysWithValues: markups.map { (key, value) in
return (Rule(symbol: Symbol(character: key)), value)
}
)

let (parsedString, elements) = try ElementParser.parse(text, for: Array(markupRules.keys))

let attributedString = NSMutableAttributedString(string: textStyle.textTransform.applied(to: parsedString))
attributedString.addAttributes(textStyle.attributes,
range: NSRange(location: 0, length: parsedString.count))

elements.forEach { (element) in
if let markup = markups[Character(element.symbol.rawValue)] {
if let markup = markupRules[element.rule] {
attributedString.addAttributes(markup.attributes, range: NSRange(element.range, in: parsedString))
}
}

return attributedString
}
6 changes: 2 additions & 4 deletions Marker/Marker/Parser/Element.swift
Original file line number Diff line number Diff line change
Expand Up @@ -8,13 +8,11 @@

import Foundation

internal typealias Index = String.CharacterView.Index

/// Markup element. Contains a symbol and the range it applies to.
internal struct Element {

/// Markup symbol.
let symbol: Symbol
/// Markup rule.
let rule: Rule

/// Range that the receiver applies to.
let range: Range<Index>
Expand Down
73 changes: 15 additions & 58 deletions Marker/Marker/Parser/ElementParser.swift
Original file line number Diff line number Diff line change
Expand Up @@ -8,79 +8,36 @@

import Foundation

/// Markup element parser.
/// Bare bones parser that strips `string` for symbols defined in `rules`.
internal struct ElementParser {

/// Parser error.
///
/// - tagMismatch: Opening tag doesn't match closing tag.
/// - unclosedTags: A tag was left unclosed.
enum ParserError: LocalizedError {

case tagMismatch
case unclosedTags

var errorDescription: String? {
switch self {
case .tagMismatch:
return "Opening tag doesn't match closing tag."
case .unclosedTags:
return "A tag was left unclosed."
}
}

}


// MARK: - Static functions

/// Parses specified string and returns a tuple containing string stripped of tag characters and an array of markup elements.
/// Parses specified string of symbols defined in `rules` and returns a tuple containing string stripped of matching characters and a list of matched elements.
///
/// - Parameters:
/// - string: String to be parsed.
/// - symbols: Symbols to parse for.
/// - Returns: Tuple containing string stripped of tag characters and an array of markup elements.
/// - rules: Rules with symbols to parse for.
/// - Returns: Tuple containing string stripped of matching characters and a list of matched elements.
/// - Throws: Parser error.
static func parse(_ string: String, for symbols: [Symbol]) throws -> (strippedString: String, elements: [Element]) {
let parser = TagParser(symbols: symbols)
let tags = parser.parse(string)

guard tags.count > 0 else {
static func parse(_ string: String, for rules: [Rule]) throws -> (strippedString: String, elements: [Element]) {
let tokens = try TokenParser.parse(string, using: rules)

guard tokens.count > 0 else {
return (string, [])
}
guard tags.count % 2 == 0 else {
throw ParserError.unclosedTags
}

var strippedString: String = ""
var strippedString = ""
var elements: [Element] = []

var startIndex: Index = string.startIndex
for i in stride(from: 0, to: tags.count, by: 2) {
let openingTag = tags[i]
let closingTag = tags[i + 1]
for token in tokens {
let range = strippedString.append(contentOf: token)

if openingTag.symbol != closingTag.symbol {
throw ParserError.tagMismatch
if let rule = token.rule {
elements.append(Element(rule: rule, range: range))
}

// Add the text from the last closing tag to the current opening tag.
strippedString += string[startIndex..<openingTag.index]

let elementStartIndex = strippedString.endIndex
// Add the text that is in between the opening and closing tags.
strippedString += string[string.index(openingTag.index, offsetBy: openingTag.symbol.length)..<closingTag.index]
let elementEndIndex = strippedString.endIndex

// Create an element that would apply to the new string.
elements.append(Element(symbol: openingTag.symbol, range: elementStartIndex..<elementEndIndex))

// Update the start index for the next iteration.
startIndex = string.index(closingTag.index, offsetBy: closingTag.symbol.length)
}

// Add from the last closing tag to the end of the string.
strippedString += string[startIndex..<string.endIndex]


return (strippedString, elements)
}

Expand Down
18 changes: 7 additions & 11 deletions Marker/Marker/Parser/MarkdownElement.swift
Original file line number Diff line number Diff line change
Expand Up @@ -14,23 +14,19 @@ import Foundation
/// - strong: Strong element.
/// - strikethrough: Strikethrough element.
/// - underline: Underline element.
/// - link: Link element.
internal enum MarkdownElement {

case em(Range<Index>)
case strong(Range<Index>)
case strikethrough(Range<Index>)
case underline(Range<Index>)
case em(range: Range<Index>)
case strong(range: Range<Index>)
case strikethrough(range: Range<Index>)
case underline(range: Range<Index>)
case link(range: Range<Index>, urlString: String)

/// Range of characters that the elements apply to.
var range: Range<Index> {
switch self {
case .em(let range):
return range
case .strong(let range):
return range
case .strikethrough(let range):
return range
case .underline(let range):
case .em(let range), .strong(let range), .strikethrough(let range), .underline(let range), .link(let range, _):
return range
}
}
Expand Down
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