//
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// YYTextParser.m
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// YYText <https://github.com/ibireme/YYText>
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//
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// Created by ibireme on 15/3/6.
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// Copyright (c) 2015 ibireme.
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//
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// This source code is licensed under the MIT-style license found in the
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// LICENSE file in the root directory of this source tree.
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//
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#import "YYTextParser.h"
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#import "YYTextUtilities.h"
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#import "YYTextAttribute.h"
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#import "NSAttributedString+YYText.h"
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#import "NSParagraphStyle+YYText.h"
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#pragma mark - Markdown Parser
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@implementation YYTextSimpleMarkdownParser {
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UIFont *_font;
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NSMutableArray *_headerFonts; ///< h1~h6
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UIFont *_boldFont;
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UIFont *_italicFont;
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UIFont *_boldItalicFont;
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UIFont *_monospaceFont;
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YYTextBorder *_border;
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NSRegularExpression *_regexEscape; ///< escape
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NSRegularExpression *_regexHeader; ///< #header
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NSRegularExpression *_regexH1; ///< header\n====
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NSRegularExpression *_regexH2; ///< header\n----
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NSRegularExpression *_regexBreakline; ///< ******
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NSRegularExpression *_regexEmphasis; ///< *text* _text_
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NSRegularExpression *_regexStrong; ///< **text**
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NSRegularExpression *_regexStrongEmphasis; ///< ***text*** ___text___
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NSRegularExpression *_regexUnderline; ///< __text__
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NSRegularExpression *_regexStrikethrough; ///< ~~text~~
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NSRegularExpression *_regexInlineCode; ///< `text`
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NSRegularExpression *_regexLink; ///< [name](link)
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NSRegularExpression *_regexLinkRefer; ///< [ref]:
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NSRegularExpression *_regexList; ///< 1.text 2.text 3.text
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NSRegularExpression *_regexBlockQuote; ///< > quote
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NSRegularExpression *_regexCodeBlock; ///< \tcode \tcode
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NSRegularExpression *_regexNotEmptyLine;
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}
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- (void)initRegex {
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#define regexp(reg, option) [NSRegularExpression regularExpressionWithPattern : @reg options : option error : NULL]
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_regexEscape = regexp("(\\\\\\\\|\\\\\\`|\\\\\\*|\\\\\\_|\\\\\\(|\\\\\\)|\\\\\\[|\\\\\\]|\\\\#|\\\\\\+|\\\\\\-|\\\\\\!)", 0);
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_regexHeader = regexp("^((\\#{1,6}[^#].*)|(\\#{6}.+))$", NSRegularExpressionAnchorsMatchLines);
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_regexH1 = regexp("^[^=\\n][^\\n]*\\n=+$", NSRegularExpressionAnchorsMatchLines);
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_regexH2 = regexp("^[^-\\n][^\\n]*\\n-+$", NSRegularExpressionAnchorsMatchLines);
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_regexBreakline = regexp("^[ \\t]*([*-])[ \\t]*((\\1)[ \\t]*){2,}[ \\t]*$", NSRegularExpressionAnchorsMatchLines);
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_regexEmphasis = regexp("((?<!\\*)\\*(?=[^ \\t*])(.+?)(?<=[^ \\t*])\\*(?!\\*)|(?<!_)_(?=[^ \\t_])(.+?)(?<=[^ \\t_])_(?!_))", 0);
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_regexStrong = regexp("(?<!\\*)\\*{2}(?=[^ \\t*])(.+?)(?<=[^ \\t*])\\*{2}(?!\\*)", 0);
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_regexStrongEmphasis = regexp("((?<!\\*)\\*{3}(?=[^ \\t*])(.+?)(?<=[^ \\t*])\\*{3}(?!\\*)|(?<!_)_{3}(?=[^ \\t_])(.+?)(?<=[^ \\t_])_{3}(?!_))", 0);
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_regexUnderline = regexp("(?<!_)__(?=[^ \\t_])(.+?)(?<=[^ \\t_])\\__(?!_)", 0);
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_regexStrikethrough = regexp("(?<!~)~~(?=[^ \\t~])(.+?)(?<=[^ \\t~])\\~~(?!~)", 0);
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_regexInlineCode = regexp("(?<!`)(`{1,3})([^`\n]+?)\\1(?!`)", 0);
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_regexLink = regexp("!?\\[([^\\[\\]]+)\\](\\(([^\\(\\)]+)\\)|\\[([^\\[\\]]+)\\])", 0);
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_regexLinkRefer = regexp("^[ \\t]*\\[[^\\[\\]]\\]:", NSRegularExpressionAnchorsMatchLines);
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_regexList = regexp("^[ \\t]*([*+-]|\\d+[.])[ \\t]+", NSRegularExpressionAnchorsMatchLines);
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_regexBlockQuote = regexp("^[ \\t]*>[ \\t>]*", NSRegularExpressionAnchorsMatchLines);
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_regexCodeBlock = regexp("(^\\s*$\\n)((( {4}|\\t).*(\\n|\\z))|(^\\s*$\\n))+", NSRegularExpressionAnchorsMatchLines);
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_regexNotEmptyLine = regexp("^[ \\t]*[^ \\t]+[ \\t]*$", NSRegularExpressionAnchorsMatchLines);
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#undef regexp
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}
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- (instancetype)init {
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self = [super init];
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_fontSize = 14;
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_headerFontSize = 20;
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[self _updateFonts];
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[self setColorWithBrightTheme];
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[self initRegex];
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return self;
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}
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- (void)setFontSize:(CGFloat)fontSize {
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if (fontSize < 1) fontSize = 12;
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_fontSize = fontSize;
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[self _updateFonts];
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}
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- (void)setHeaderFontSize:(CGFloat)headerFontSize {
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if (headerFontSize < 1) headerFontSize = 20;
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_headerFontSize = headerFontSize;
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[self _updateFonts];
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}
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- (void)_updateFonts {
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_font = [UIFont systemFontOfSize:_fontSize];
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_headerFonts = [NSMutableArray new];
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for (int i = 0; i < 6; i++) {
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CGFloat size = _headerFontSize - (_headerFontSize - _fontSize) / 5.0 * i;
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[_headerFonts addObject:[UIFont systemFontOfSize:size]];
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}
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_boldFont = YYTextFontWithBold(_font);
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_italicFont = YYTextFontWithItalic(_font);
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_boldItalicFont = YYTextFontWithBoldItalic(_font);
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_monospaceFont = [UIFont fontWithName:@"Menlo" size:_fontSize]; // Since iOS 7
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if (!_monospaceFont) _monospaceFont = [UIFont fontWithName:@"Courier" size:_fontSize]; // Since iOS 3
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}
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- (void)setColorWithBrightTheme {
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_textColor = [UIColor blackColor];
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_controlTextColor = [UIColor colorWithWhite:0.749 alpha:1.000];
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_headerTextColor = [UIColor colorWithRed:1.000 green:0.502 blue:0.000 alpha:1.000];
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_inlineTextColor = [UIColor colorWithWhite:0.150 alpha:1.000];
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_codeTextColor = [UIColor colorWithWhite:0.150 alpha:1.000];
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_linkTextColor = [UIColor colorWithRed:0.000 green:0.478 blue:0.962 alpha:1.000];
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_border = [YYTextBorder new];
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_border.lineStyle = YYTextLineStyleSingle;
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_border.fillColor = [UIColor colorWithWhite:0.184 alpha:0.090];
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_border.strokeColor = [UIColor colorWithWhite:0.546 alpha:0.650];
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_border.insets = UIEdgeInsetsMake(-1, 0, -1, 0);
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_border.cornerRadius = 2;
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_border.strokeWidth = YYTextCGFloatFromPixel(1);
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}
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- (void)setColorWithDarkTheme {
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_textColor = [UIColor whiteColor];
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_controlTextColor = [UIColor colorWithWhite:0.604 alpha:1.000];
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_headerTextColor = [UIColor colorWithRed:0.558 green:1.000 blue:0.502 alpha:1.000];
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_inlineTextColor = [UIColor colorWithRed:1.000 green:0.862 blue:0.387 alpha:1.000];
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_codeTextColor = [UIColor colorWithWhite:0.906 alpha:1.000];
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_linkTextColor = [UIColor colorWithRed:0.000 green:0.646 blue:1.000 alpha:1.000];
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_border = [YYTextBorder new];
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_border.lineStyle = YYTextLineStyleSingle;
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_border.fillColor = [UIColor colorWithWhite:0.820 alpha:0.130];
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_border.strokeColor = [UIColor colorWithWhite:1.000 alpha:0.280];
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_border.insets = UIEdgeInsetsMake(-1, 0, -1, 0);
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_border.cornerRadius = 2;
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_border.strokeWidth = YYTextCGFloatFromPixel(1);
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}
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- (NSUInteger)lenghOfBeginWhiteInString:(NSString *)str withRange:(NSRange)range{
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for (NSUInteger i = 0; i < range.length; i++) {
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unichar c = [str characterAtIndex:i + range.location];
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if (c != ' ' && c != '\t' && c != '\n') return i;
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}
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return str.length;
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}
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- (NSUInteger)lenghOfEndWhiteInString:(NSString *)str withRange:(NSRange)range{
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for (NSInteger i = range.length - 1; i >= 0; i--) {
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unichar c = [str characterAtIndex:i + range.location];
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if (c != ' ' && c != '\t' && c != '\n') return range.length - i;
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}
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return str.length;
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}
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- (NSUInteger)lenghOfBeginChar:(unichar)c inString:(NSString *)str withRange:(NSRange)range{
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for (NSUInteger i = 0; i < range.length; i++) {
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if ([str characterAtIndex:i + range.location] != c) return i;
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}
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return str.length;
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}
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- (BOOL)parseText:(NSMutableAttributedString *)text selectedRange:(NSRangePointer)range {
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if (text.length == 0) return NO;
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[text yy_removeAttributesInRange:NSMakeRange(0, text.length)];
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text.yy_font = _font;
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text.yy_color = _textColor;
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NSMutableString *str = text.string.mutableCopy;
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[_regexEscape replaceMatchesInString:str options:kNilOptions range:NSMakeRange(0, str.length) withTemplate:@"@@"];
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[_regexHeader enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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NSUInteger whiteLen = [self lenghOfBeginWhiteInString:str withRange:r];
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NSUInteger sharpLen = [self lenghOfBeginChar:'#' inString:str withRange:NSMakeRange(r.location + whiteLen, r.length - whiteLen)];
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if (sharpLen > 6) sharpLen = 6;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, whiteLen + sharpLen)];
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[text yy_setColor:_headerTextColor range:NSMakeRange(r.location + whiteLen + sharpLen, r.length - whiteLen - sharpLen)];
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[text yy_setFont:_headerFonts[sharpLen - 1] range:result.range];
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}];
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[_regexH1 enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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NSRange linebreak = [str rangeOfString:@"\n" options:0 range:result.range locale:nil];
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if (linebreak.location != NSNotFound) {
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[text yy_setColor:_headerTextColor range:NSMakeRange(r.location, linebreak.location - r.location)];
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[text yy_setFont:_headerFonts[0] range:NSMakeRange(r.location, linebreak.location - r.location + 1)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(linebreak.location + linebreak.length, r.location + r.length - linebreak.location - linebreak.length)];
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}
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}];
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[_regexH2 enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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NSRange linebreak = [str rangeOfString:@"\n" options:0 range:result.range locale:nil];
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if (linebreak.location != NSNotFound) {
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[text yy_setColor:_headerTextColor range:NSMakeRange(r.location, linebreak.location - r.location)];
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[text yy_setFont:_headerFonts[1] range:NSMakeRange(r.location, linebreak.location - r.location + 1)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(linebreak.location + linebreak.length, r.location + r.length - linebreak.location - linebreak.length)];
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}
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}];
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[_regexBreakline enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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[text yy_setColor:_controlTextColor range:result.range];
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}];
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[_regexEmphasis enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, 1)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - 1, 1)];
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[text yy_setFont:_italicFont range:NSMakeRange(r.location + 1, r.length - 2)];
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}];
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[_regexStrong enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, 2)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - 2, 2)];
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[text yy_setFont:_boldFont range:NSMakeRange(r.location + 2, r.length - 4)];
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}];
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[_regexStrongEmphasis enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, 3)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - 3, 3)];
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[text yy_setFont:_boldItalicFont range:NSMakeRange(r.location + 3, r.length - 6)];
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}];
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[_regexUnderline enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, 2)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - 2, 2)];
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[text yy_setTextUnderline:[YYTextDecoration decorationWithStyle:YYTextLineStyleSingle width:@1 color:nil] range:NSMakeRange(r.location + 2, r.length - 4)];
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}];
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[_regexStrikethrough enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, 2)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - 2, 2)];
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[text yy_setTextStrikethrough:[YYTextDecoration decorationWithStyle:YYTextLineStyleSingle width:@1 color:nil] range:NSMakeRange(r.location + 2, r.length - 4)];
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}];
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[_regexInlineCode enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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NSUInteger len = [self lenghOfBeginChar:'`' inString:str withRange:r];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location, len)];
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[text yy_setColor:_controlTextColor range:NSMakeRange(r.location + r.length - len, len)];
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[text yy_setColor:_inlineTextColor range:NSMakeRange(r.location + len, r.length - 2 * len)];
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[text yy_setFont:_monospaceFont range:r];
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[text yy_setTextBorder:_border.copy range:r];
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}];
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[_regexLink enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_linkTextColor range:r];
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}];
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[_regexLinkRefer enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:r];
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}];
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[_regexList enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:r];
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}];
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[_regexBlockQuote enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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[text yy_setColor:_controlTextColor range:r];
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}];
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[_regexCodeBlock enumerateMatchesInString:str options:0 range:NSMakeRange(0, str.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
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NSRange r = result.range;
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NSRange firstLineRange = [_regexNotEmptyLine rangeOfFirstMatchInString:str options:kNilOptions range:r];
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NSUInteger lenStart = (firstLineRange.location != NSNotFound) ? firstLineRange.location - r.location : 0;
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NSUInteger lenEnd = [self lenghOfEndWhiteInString:str withRange:r];
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if (lenStart + lenEnd < r.length) {
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NSRange codeR = NSMakeRange(r.location + lenStart, r.length - lenStart - lenEnd);
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[text yy_setColor:_codeTextColor range:codeR];
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[text yy_setFont:_monospaceFont range:codeR];
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YYTextBorder *border = [YYTextBorder new];
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border.lineStyle = YYTextLineStyleSingle;
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border.fillColor = [UIColor colorWithWhite:0.184 alpha:0.090];
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border.strokeColor = [UIColor colorWithWhite:0.200 alpha:0.300];
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border.insets = UIEdgeInsetsMake(-1, 0, -1, 0);
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border.cornerRadius = 3;
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border.strokeWidth = YYTextCGFloatFromPixel(2);
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[text yy_setTextBlockBorder:_border.copy range:codeR];
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}
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}];
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return YES;
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}
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@end
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#pragma mark - Emoticon Parser
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#define LOCK(...) dispatch_semaphore_wait(_lock, DISPATCH_TIME_FOREVER); \
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__VA_ARGS__; \
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dispatch_semaphore_signal(_lock);
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@implementation YYTextSimpleEmoticonParser {
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NSRegularExpression *_regex;
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NSDictionary *_mapper;
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dispatch_semaphore_t _lock;
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}
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- (instancetype)init {
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self = [super init];
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_lock = dispatch_semaphore_create(1);
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return self;
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}
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- (NSDictionary *)emoticonMapper {
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LOCK(NSDictionary *mapper = _mapper); return mapper;
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}
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- (void)setEmoticonMapper:(NSDictionary *)emoticonMapper {
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LOCK(
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_mapper = emoticonMapper.copy;
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if (_mapper.count == 0) {
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_regex = nil;
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} else {
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NSMutableString *pattern = @"(".mutableCopy;
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NSArray *allKeys = _mapper.allKeys;
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NSCharacterSet *charset = [NSCharacterSet characterSetWithCharactersInString:@"$^?+*.,#|{}[]()\\"];
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for (NSUInteger i = 0, max = allKeys.count; i < max; i++) {
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NSMutableString *one = [allKeys[i] mutableCopy];
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// escape regex characters
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for (NSUInteger ci = 0, cmax = one.length; ci < cmax; ci++) {
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unichar c = [one characterAtIndex:ci];
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if ([charset characterIsMember:c]) {
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[one insertString:@"\\" atIndex:ci];
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ci++;
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cmax++;
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}
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}
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[pattern appendString:one];
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if (i != max - 1) [pattern appendString:@"|"];
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}
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[pattern appendString:@")"];
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_regex = [[NSRegularExpression alloc] initWithPattern:pattern options:kNilOptions error:nil];
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}
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);
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}
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// correct the selected range during text replacement
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- (NSRange)_replaceTextInRange:(NSRange)range withLength:(NSUInteger)length selectedRange:(NSRange)selectedRange {
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// no change
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if (range.length == length) return selectedRange;
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// right
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if (range.location >= selectedRange.location + selectedRange.length) return selectedRange;
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// left
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if (selectedRange.location >= range.location + range.length) {
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selectedRange.location = selectedRange.location + length - range.length;
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return selectedRange;
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}
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// same
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if (NSEqualRanges(range, selectedRange)) {
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selectedRange.length = length;
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return selectedRange;
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}
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// one edge same
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if ((range.location == selectedRange.location && range.length < selectedRange.length) ||
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(range.location + range.length == selectedRange.location + selectedRange.length && range.length < selectedRange.length)) {
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selectedRange.length = selectedRange.length + length - range.length;
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return selectedRange;
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}
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selectedRange.location = range.location + length;
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selectedRange.length = 0;
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return selectedRange;
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}
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- (BOOL)parseText:(NSMutableAttributedString *)text selectedRange:(NSRangePointer)range {
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if (text.length == 0) return NO;
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NSDictionary *mapper;
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NSRegularExpression *regex;
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LOCK(mapper = _mapper; regex = _regex;);
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if (mapper.count == 0 || regex == nil) return NO;
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NSArray *matches = [regex matchesInString:text.string options:kNilOptions range:NSMakeRange(0, text.length)];
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if (matches.count == 0) return NO;
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NSRange selectedRange = range ? *range : NSMakeRange(0, 0);
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NSUInteger cutLength = 0;
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for (NSUInteger i = 0, max = matches.count; i < max; i++) {
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NSTextCheckingResult *one = matches[i];
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NSRange oneRange = one.range;
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if (oneRange.length == 0) continue;
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oneRange.location -= cutLength;
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NSString *subStr = [text.string substringWithRange:oneRange];
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UIImage *emoticon = mapper[subStr];
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if (!emoticon) continue;
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CGFloat fontSize = 12; // CoreText default value
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CTFontRef font = (__bridge CTFontRef)([text yy_attribute:NSFontAttributeName atIndex:oneRange.location]);
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if (font) fontSize = CTFontGetSize(font);
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NSMutableAttributedString *atr = [NSAttributedString yy_attachmentStringWithEmojiImage:emoticon fontSize:fontSize];
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[atr yy_setTextBackedString:[YYTextBackedString stringWithString:subStr] range:NSMakeRange(0, atr.length)];
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[text replaceCharactersInRange:oneRange withString:atr.string];
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[text yy_removeDiscontinuousAttributesInRange:NSMakeRange(oneRange.location, atr.length)];
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[text addAttributes:atr.yy_attributes range:NSMakeRange(oneRange.location, atr.length)];
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selectedRange = [self _replaceTextInRange:oneRange withLength:atr.length selectedRange:selectedRange];
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cutLength += oneRange.length - 1;
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}
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if (range) *range = selectedRange;
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return YES;
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}
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@end
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