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| 1 | +import 'dart:ui'; |
| 2 | + |
| 3 | +import 'package:csslib/visitor.dart' as css; |
| 4 | +import 'package:csslib/parser.dart' as cssparser; |
| 5 | +import 'package:flutter_html/style.dart'; |
| 6 | + |
| 7 | +Style declarationsToStyle(Map<String, List<css.Expression>> declarations) { |
| 8 | + Style style = new Style(); |
| 9 | + declarations.forEach((property, value) { |
| 10 | + switch (property) { |
| 11 | + case 'background-color': |
| 12 | + style.backgroundColor = |
| 13 | + ExpressionMapping.expressionToColor(value.first); |
| 14 | + break; |
| 15 | + case 'color': |
| 16 | + style.color = ExpressionMapping.expressionToColor(value.first); |
| 17 | + break; |
| 18 | + } |
| 19 | + }); |
| 20 | + return style; |
| 21 | +} |
| 22 | + |
| 23 | +Style inlineCSSToStyle(String inlineStyle) { |
| 24 | + final sheet = cssparser.parse("*{$inlineStyle}"); |
| 25 | + final declarations = DeclarationVisitor().getDeclarations(sheet); |
| 26 | + return declarationsToStyle(declarations); |
| 27 | +} |
| 28 | + |
| 29 | +class DeclarationVisitor extends css.Visitor { |
| 30 | + Map<String, List<css.Expression>> _result; |
| 31 | + String _currentProperty; |
| 32 | + |
| 33 | + Map<String, List<css.Expression>> getDeclarations(css.StyleSheet sheet) { |
| 34 | + _result = new Map<String, List<css.Expression>>(); |
| 35 | + sheet.visit(this); |
| 36 | + return _result; |
| 37 | + } |
| 38 | + |
| 39 | + @override |
| 40 | + void visitDeclaration(css.Declaration node) { |
| 41 | + _currentProperty = node.property; |
| 42 | + _result[_currentProperty] = new List<css.Expression>(); |
| 43 | + node.expression.visit(this); |
| 44 | + } |
| 45 | + |
| 46 | + @override |
| 47 | + void visitExpressions(css.Expressions node) { |
| 48 | + node.expressions.forEach((expression) { |
| 49 | + _result[_currentProperty].add(expression); |
| 50 | + }); |
| 51 | + } |
| 52 | +} |
| 53 | + |
| 54 | +//Mapping functions |
| 55 | +class ExpressionMapping { |
| 56 | + static Color expressionToColor(css.Expression value) { |
| 57 | + if (value is css.HexColorTerm) { |
| 58 | + return stringToColor(value.text); |
| 59 | + } else if (value is css.FunctionTerm) { |
| 60 | + if (value.text == 'rgba') { |
| 61 | + return rgbOrRgbaToColor(value.span.text); |
| 62 | + } else if (value.text == 'rgb') { |
| 63 | + return rgbOrRgbaToColor(value.span.text); |
| 64 | + } |
| 65 | + } |
| 66 | + return null; |
| 67 | + } |
| 68 | + |
| 69 | + static Color stringToColor(String _text) { |
| 70 | + var text = _text.replaceFirst('#', ''); |
| 71 | + if (text.length == 3) |
| 72 | + text = text.replaceAllMapped( |
| 73 | + RegExp(r"[a-f]|\d"), (match) => '${match.group(0)}${match.group(0)}'); |
| 74 | + int color = int.parse(text, radix: 16); |
| 75 | + |
| 76 | + if (color <= 0xffffff) { |
| 77 | + return new Color(color).withAlpha(255); |
| 78 | + } else { |
| 79 | + return new Color(color); |
| 80 | + } |
| 81 | + } |
| 82 | + |
| 83 | + static Color rgbOrRgbaToColor(String text) { |
| 84 | + final rgbaText = text.replaceAll(')', '').replaceAll(' ', ''); |
| 85 | + try { |
| 86 | + final rgbaValues = |
| 87 | + rgbaText.split(',').map((value) => double.parse(value)).toList(); |
| 88 | + if (rgbaValues.length == 4) { |
| 89 | + return Color.fromRGBO( |
| 90 | + rgbaValues[0].toInt(), |
| 91 | + rgbaValues[1].toInt(), |
| 92 | + rgbaValues[2].toInt(), |
| 93 | + rgbaValues[3], |
| 94 | + ); |
| 95 | + } else if (rgbaValues.length == 3) { |
| 96 | + return Color.fromRGBO( |
| 97 | + rgbaValues[0].toInt(), |
| 98 | + rgbaValues[1].toInt(), |
| 99 | + rgbaValues[2].toInt(), |
| 100 | + 1.0, |
| 101 | + ); |
| 102 | + } |
| 103 | + return null; |
| 104 | + } catch (e) { |
| 105 | + return null; |
| 106 | + } |
| 107 | + } |
| 108 | +} |
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