101 lines
3 KiB
Dart
101 lines
3 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/widgets.dart';
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import 'package:highlight/highlight.dart' show highlight, Node;
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// TODO TLAD use the TextSpan getter instead of this modified `HighlightView` when this is fixed: https://github.com/git-touch/highlight/issues/6
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/// Highlight Flutter Widget
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class AvesHighlightView extends StatelessWidget {
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/// The original code to be highlighted
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final String source;
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/// Highlight language
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///
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/// It is recommended to give it a value for performance
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///
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/// [All available languages](https://github.com/pd4d10/highlight/tree/master/highlight/lib/languages)
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final String language;
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/// Highlight theme
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///
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/// [All available themes](https://github.com/pd4d10/highlight/blob/master/flutter_highlight/lib/themes)
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final Map<String, TextStyle> theme;
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/// Padding
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final EdgeInsetsGeometry padding;
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/// Text styles
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///
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/// Specify text styles such as font family and font size
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final TextStyle textStyle;
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AvesHighlightView(
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String input, {
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this.language,
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this.theme = const {},
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this.padding,
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this.textStyle,
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int tabSize = 8, // TODO: https://github.com/flutter/flutter/issues/50087
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}) : source = input.replaceAll('\t', ' ' * tabSize);
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List<TextSpan> _convert(List<Node> nodes) {
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final spans = <TextSpan>[];
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var currentSpans = spans;
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final stack = <List<TextSpan>>[];
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void _traverse(Node node) {
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if (node.value != null) {
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currentSpans.add(node.className == null ? TextSpan(text: node.value) : TextSpan(text: node.value, style: theme[node.className]));
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} else if (node.children != null) {
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final tmp = <TextSpan>[];
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currentSpans.add(TextSpan(children: tmp, style: theme[node.className]));
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stack.add(currentSpans);
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currentSpans = tmp;
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node.children.forEach((n) {
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_traverse(n);
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if (n == node.children.last) {
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currentSpans = stack.isEmpty ? spans : stack.removeLast();
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}
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});
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}
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}
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for (var node in nodes) {
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_traverse(node);
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}
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return spans;
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}
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static const _rootKey = 'root';
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static const _defaultFontColor = Color(0xff000000);
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static const _defaultBackgroundColor = Color(0xffffffff);
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// TODO: dart:io is not available at web platform currently
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// See: https://github.com/flutter/flutter/issues/39998
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// So we just use monospace here for now
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static const _defaultFontFamily = 'monospace';
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@override
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Widget build(BuildContext context) {
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var _textStyle = TextStyle(
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fontFamily: _defaultFontFamily,
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color: theme[_rootKey]?.color ?? _defaultFontColor,
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);
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if (textStyle != null) {
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_textStyle = _textStyle.merge(textStyle);
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}
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return Container(
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color: theme[_rootKey]?.backgroundColor ?? _defaultBackgroundColor,
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padding: padding,
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child: SelectableText.rich(
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TextSpan(
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style: _textStyle,
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children: _convert(highlight.parse(source, language: language).nodes),
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),
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),
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);
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}
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}
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