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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:markdown_widget/markdown_widget.dart'; | ||
| import 'package:flutter_math_fork/flutter_math.dart'; | ||
| import 'package:markdown/markdown.dart' as m; | ||
|
|
||
| SpanNodeGeneratorWithTag latexGenerator = SpanNodeGeneratorWithTag( | ||
| tag: _latexTag, | ||
| generator: (e, config, visitor) => | ||
| LatexNode(e.attributes, e.textContent, config)); | ||
|
|
||
| const _latexTag = 'latex'; | ||
|
|
||
| class LatexSyntax extends m.InlineSyntax { | ||
| LatexSyntax() : super(r'(\$\$[\s\S]+\$\$)|(\$.+\$)'); | ||
|
|
||
| @override | ||
| bool onMatch(m.InlineParser parser, Match match) { | ||
| final input = match.input; | ||
| final matchValue = input.substring(match.start, match.end); | ||
| String content = ''; | ||
| bool isInline = true; | ||
| const blockSyntax = '\$\$'; | ||
| const inlineSyntax = '\$'; | ||
| if (matchValue.startsWith(blockSyntax) && | ||
| matchValue.endsWith(blockSyntax) && | ||
| (matchValue != blockSyntax)) { | ||
| content = matchValue.substring(2, matchValue.length - 2); | ||
| isInline = false; | ||
| } else if (matchValue.startsWith(inlineSyntax) && | ||
| matchValue.endsWith(inlineSyntax) && | ||
| matchValue != inlineSyntax) { | ||
| content = matchValue.substring(1, matchValue.length - 1); | ||
| } | ||
| m.Element el = m.Element.text(_latexTag, matchValue); | ||
| el.attributes['content'] = content; | ||
| el.attributes['isInline'] = '$isInline'; | ||
| parser.addNode(el); | ||
| return true; | ||
| } | ||
| } | ||
|
|
||
| class LatexNode extends SpanNode { | ||
| final Map<String, String> attributes; | ||
| final String textContent; | ||
| final MarkdownConfig config; | ||
|
|
||
| LatexNode(this.attributes, this.textContent, this.config); | ||
|
|
||
| @override | ||
| InlineSpan build() { | ||
| final content = attributes['content'] ?? ''; | ||
| final isInline = attributes['isInline'] == 'true'; | ||
| final style = parentStyle ?? config.p.textStyle; | ||
| if (content.isEmpty) return TextSpan(style: style, text: textContent); | ||
| final latex = Math.tex( | ||
| content, | ||
| mathStyle: MathStyle.text, | ||
| // textStyle: style.copyWith(color: isDark ? Colors.white : Colors.black), | ||
| textScaleFactor: 1, | ||
| onErrorFallback: (error) { | ||
| return Text( | ||
| textContent, | ||
| style: style.copyWith(color: Colors.red), | ||
| ); | ||
| }, | ||
| ); | ||
| return WidgetSpan( | ||
| child: !isInline | ||
| ? Container( | ||
| width: double.infinity, | ||
| margin: const EdgeInsets.symmetric(vertical: 16), | ||
| child: Center(child: latex), | ||
| ) | ||
| : latex); | ||
| } | ||
| } |
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