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css_parser.dart
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import 'package:collection/collection.dart';
import 'package:csslib/visitor.dart' as css;
import 'package:csslib/parser.dart' as cssparser;
import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';
import 'package:flutter_html/src/utils.dart';
//TODO refactor
Style declarationsToStyle(Map<String, List<css.Expression>> declarations) {
Style style = Style();
declarations.forEach((property, value) {
if (value.isNotEmpty) {
switch (property) {
case 'background-color':
style.backgroundColor =
ExpressionMapping.expressionToColor(value.first) ??
style.backgroundColor;
break;
case 'border':
List<css.LiteralTerm?>? borderWidths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.width], so make sure to remove those before passing it to [ExpressionMapping]
borderWidths.removeWhere((element) =>
element == null ||
(element.text != "thin" &&
element.text != "medium" &&
element.text != "thick" &&
element is! css.LengthTerm &&
element is! css.PercentageTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm));
List<css.Expression?>? borderColors = value
.where((element) =>
ExpressionMapping.expressionToColor(element) != null)
.toList();
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// Currently doesn't matter, as Flutter only supports "solid" or "none", but may support more in the future.
List<String> possibleBorderValues = [
"dotted",
"dashed",
"solid",
"double",
"groove",
"ridge",
"inset",
"outset",
"none",
"hidden"
];
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.style], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null || !possibleBorderValues.contains(element.text));
List<css.LiteralTerm?>? borderStyles = potentialStyles;
style.border = ExpressionMapping.expressionToBorder(
borderWidths, borderStyles, borderColors);
break;
case 'border-left':
List<css.LiteralTerm?>? borderWidths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.width], so make sure to remove those before passing it to [ExpressionMapping]
borderWidths.removeWhere((element) =>
element == null ||
(element.text != "thin" &&
element.text != "medium" &&
element.text != "thick" &&
element is! css.LengthTerm &&
element is! css.PercentageTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm));
css.LiteralTerm? borderWidth =
borderWidths.firstWhereOrNull((element) => element != null);
css.Expression? borderColor = value.firstWhereOrNull((element) =>
ExpressionMapping.expressionToColor(element) != null);
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// Currently doesn't matter, as Flutter only supports "solid" or "none", but may support more in the future.
List<String> possibleBorderValues = [
"dotted",
"dashed",
"solid",
"double",
"groove",
"ridge",
"inset",
"outset",
"none",
"hidden"
];
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.style], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null || !possibleBorderValues.contains(element.text));
css.LiteralTerm? borderStyle = potentialStyles.firstOrNull;
Border newBorder = Border(
left: style.border?.left.copyWith(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor),
) ??
BorderSide(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor) ??
Colors.black,
),
right: style.border?.right ?? BorderSide.none,
top: style.border?.top ?? BorderSide.none,
bottom: style.border?.bottom ?? BorderSide.none,
);
style.border = newBorder;
break;
case 'border-right':
List<css.LiteralTerm?>? borderWidths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.width], so make sure to remove those before passing it to [ExpressionMapping]
borderWidths.removeWhere((element) =>
element == null ||
(element.text != "thin" &&
element.text != "medium" &&
element.text != "thick" &&
element is! css.LengthTerm &&
element is! css.PercentageTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm));
css.LiteralTerm? borderWidth =
borderWidths.firstWhereOrNull((element) => element != null);
css.Expression? borderColor = value.firstWhereOrNull((element) =>
ExpressionMapping.expressionToColor(element) != null);
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// Currently doesn't matter, as Flutter only supports "solid" or "none", but may support more in the future.
List<String> possibleBorderValues = [
"dotted",
"dashed",
"solid",
"double",
"groove",
"ridge",
"inset",
"outset",
"none",
"hidden"
];
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.style], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null || !possibleBorderValues.contains(element.text));
css.LiteralTerm? borderStyle = potentialStyles.firstOrNull;
Border newBorder = Border(
left: style.border?.left ?? BorderSide.none,
right: style.border?.right.copyWith(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor),
) ??
BorderSide(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor) ??
Colors.black,
),
top: style.border?.top ?? BorderSide.none,
bottom: style.border?.bottom ?? BorderSide.none,
);
style.border = newBorder;
break;
case 'border-top':
List<css.LiteralTerm?>? borderWidths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.width], so make sure to remove those before passing it to [ExpressionMapping]
borderWidths.removeWhere((element) =>
element == null ||
(element.text != "thin" &&
element.text != "medium" &&
element.text != "thick" &&
element is! css.LengthTerm &&
element is! css.PercentageTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm));
css.LiteralTerm? borderWidth =
borderWidths.firstWhereOrNull((element) => element != null);
css.Expression? borderColor = value.firstWhereOrNull((element) =>
ExpressionMapping.expressionToColor(element) != null);
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// Currently doesn't matter, as Flutter only supports "solid" or "none", but may support more in the future.
List<String> possibleBorderValues = [
"dotted",
"dashed",
"solid",
"double",
"groove",
"ridge",
"inset",
"outset",
"none",
"hidden"
];
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.style], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null || !possibleBorderValues.contains(element.text));
css.LiteralTerm? borderStyle = potentialStyles.firstOrNull;
Border newBorder = Border(
left: style.border?.left ?? BorderSide.none,
right: style.border?.right ?? BorderSide.none,
top: style.border?.top.copyWith(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor),
) ??
BorderSide(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor) ??
Colors.black,
),
bottom: style.border?.bottom ?? BorderSide.none,
);
style.border = newBorder;
break;
case 'border-bottom':
List<css.LiteralTerm?>? borderWidths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.width], so make sure to remove those before passing it to [ExpressionMapping]
borderWidths.removeWhere((element) =>
element == null ||
(element.text != "thin" &&
element.text != "medium" &&
element.text != "thick" &&
element is! css.LengthTerm &&
element is! css.PercentageTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm));
css.LiteralTerm? borderWidth =
borderWidths.firstWhereOrNull((element) => element != null);
css.Expression? borderColor = value.firstWhereOrNull((element) =>
ExpressionMapping.expressionToColor(element) != null);
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// Currently doesn't matter, as Flutter only supports "solid" or "none", but may support more in the future.
List<String> possibleBorderValues = [
"dotted",
"dashed",
"solid",
"double",
"groove",
"ridge",
"inset",
"outset",
"none",
"hidden"
];
/// List<css.LiteralTerm> might include other values than the ones we want for [BorderSide.style], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null || !possibleBorderValues.contains(element.text));
css.LiteralTerm? borderStyle = potentialStyles.firstOrNull;
Border newBorder = Border(
left: style.border?.left ?? BorderSide.none,
right: style.border?.right ?? BorderSide.none,
top: style.border?.top ?? BorderSide.none,
bottom: style.border?.bottom.copyWith(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor),
) ??
BorderSide(
width: ExpressionMapping.expressionToBorderWidth(borderWidth),
style: ExpressionMapping.expressionToBorderStyle(borderStyle),
color: ExpressionMapping.expressionToColor(borderColor) ??
Colors.black,
),
);
style.border = newBorder;
break;
case 'color':
style.color = style.textDecorationColor =
ExpressionMapping.expressionToColor(value.first) ?? style.color;
break;
case 'direction':
style.direction =
ExpressionMapping.expressionToDirection(value.first);
break;
case 'display':
style.display = ExpressionMapping.expressionToDisplay(value.first);
break;
case 'line-height':
style.lineHeight =
ExpressionMapping.expressionToLineHeight(value.first);
break;
case 'font-family':
style.fontFamily =
ExpressionMapping.expressionToFontFamily(value.first) ??
style.fontFamily;
break;
case 'font-feature-settings':
style.fontFeatureSettings =
ExpressionMapping.expressionToFontFeatureSettings(value);
break;
case 'font-size':
style.fontSize =
ExpressionMapping.expressionToFontSize(value.first) ??
style.fontSize;
break;
case 'font-style':
style.fontStyle =
ExpressionMapping.expressionToFontStyle(value.first);
break;
case 'font-weight':
style.fontWeight =
ExpressionMapping.expressionToFontWeight(value.first);
break;
case 'list-style':
css.LiteralTerm? position = value.firstWhereOrNull((e) =>
e is css.LiteralTerm &&
(e.text == "outside" || e.text == "inside")) as css.LiteralTerm?;
css.UriTerm? image =
value.firstWhereOrNull((e) => e is css.UriTerm) as css.UriTerm?;
css.LiteralTerm? type = value.firstWhereOrNull((e) =>
e is css.LiteralTerm &&
e.text != "outside" &&
e.text != "inside") as css.LiteralTerm?;
if (position != null) {
switch (position.text) {
case 'outside':
style.listStylePosition = ListStylePosition.outside;
break;
case 'inside':
style.listStylePosition = ListStylePosition.inside;
break;
}
}
if (image != null) {
style.listStyleImage =
ExpressionMapping.expressionToListStyleImage(image) ??
style.listStyleImage;
} else if (type != null) {
style.listStyleType =
ExpressionMapping.expressionToListStyleType(type) ??
style.listStyleType;
}
break;
case 'list-style-image':
if (value.first is css.UriTerm) {
style.listStyleImage = ExpressionMapping.expressionToListStyleImage(
value.first as css.UriTerm) ??
style.listStyleImage;
}
break;
case 'list-style-position':
if (value.first is css.LiteralTerm) {
switch ((value.first as css.LiteralTerm).text) {
case 'outside':
style.listStylePosition = ListStylePosition.outside;
break;
case 'inside':
style.listStylePosition = ListStylePosition.inside;
break;
}
}
break;
case 'height':
style.height =
ExpressionMapping.expressionToHeight(value.first) ?? style.height;
break;
case 'list-style-type':
if (value.first is css.LiteralTerm) {
style.listStyleType = ExpressionMapping.expressionToListStyleType(
value.first as css.LiteralTerm) ??
style.listStyleType;
}
break;
case 'margin':
List<css.LiteralTerm>? marginLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for margin length, so make sure to remove those before passing it to [ExpressionMapping]
marginLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm &&
!(element.text == 'auto'));
Margins margin = ExpressionMapping.expressionToMargins(marginLengths);
style.margin = (style.margin ?? const Margins()).copyWith(
left: margin.left,
right: margin.right,
top: margin.top,
bottom: margin.bottom,
);
break;
case 'margin-left':
style.margin = (style.margin ?? const Margins()).copyWith(
left: ExpressionMapping.expressionToMargin(value.first));
break;
case 'margin-right':
style.margin = (style.margin ?? const Margins()).copyWith(
right: ExpressionMapping.expressionToMargin(value.first));
break;
case 'margin-top':
style.margin = (style.margin ?? const Margins())
.copyWith(top: ExpressionMapping.expressionToMargin(value.first));
break;
case 'margin-bottom':
style.margin = (style.margin ?? const Margins()).copyWith(
bottom: ExpressionMapping.expressionToMargin(value.first));
break;
case 'margin-inline':
List<css.LiteralTerm>? marginLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for margin length, so make sure to remove those before passing it to [ExpressionMapping]
marginLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm &&
!(element.text == 'auto'));
Margins margin =
ExpressionMapping.expressionToInlineMargins(marginLengths);
style.margin = (style.margin ?? const Margins()).copyWith(
inlineStart: margin.inlineStart,
inlineEnd: margin.inlineEnd,
);
break;
case 'margin-inline-end':
style.margin = (style.margin ?? const Margins()).copyWith(
inlineEnd: ExpressionMapping.expressionToMargin(value.first),
);
break;
case 'margin-inline-start':
style.margin = (style.margin ?? const Margins()).copyWith(
inlineStart: ExpressionMapping.expressionToMargin(value.first),
);
break;
case 'margin-block':
List<css.LiteralTerm>? marginLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for margin length, so make sure to remove those before passing it to [ExpressionMapping]
marginLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm &&
!(element.text == 'auto'));
Margins margin =
ExpressionMapping.expressionToBlockMargins(marginLengths);
style.margin = (style.margin ?? const Margins()).copyWith(
blockStart: margin.blockStart,
blockEnd: margin.blockEnd,
);
break;
case 'margin-block-end':
style.margin = (style.margin ?? const Margins()).copyWith(
blockEnd: ExpressionMapping.expressionToMargin(value.first),
);
break;
case 'margin-block-start':
style.margin = (style.margin ?? const Margins()).copyWith(
blockStart: ExpressionMapping.expressionToMargin(value.first),
);
break;
case 'padding':
List<css.LiteralTerm>? paddingLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for padding length, so make sure to remove those before passing it to [ExpressionMapping]
paddingLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm);
final padding =
ExpressionMapping.expressionToHtmlPaddings(paddingLengths);
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
left: padding.left,
right: padding.right,
top: padding.top,
bottom: padding.bottom,
);
break;
case 'padding-left':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
left: ExpressionMapping.expressionToHtmlPadding(value.first));
break;
case 'padding-right':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
right: ExpressionMapping.expressionToHtmlPadding(value.first));
break;
case 'padding-top':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
top: ExpressionMapping.expressionToHtmlPadding(value.first));
break;
case 'padding-bottom':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
bottom: ExpressionMapping.expressionToHtmlPadding(value.first));
break;
case 'padding-inline':
List<css.LiteralTerm>? paddingLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for padding length, so make sure to remove those before passing it to [ExpressionMapping]
paddingLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm);
HtmlPaddings padding =
ExpressionMapping.expressionToInlineHtmlPadding(paddingLengths);
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
inlineStart: padding.inlineStart,
inlineEnd: padding.inlineEnd,
);
break;
case 'padding-inline-end':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
inlineEnd: ExpressionMapping.expressionToHtmlPadding(value.first),
);
break;
case 'padding-inline-start':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
inlineStart: ExpressionMapping.expressionToHtmlPadding(value.first),
);
break;
case 'padding-block':
List<css.LiteralTerm>? paddingLengths =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for padding length, so make sure to remove those before passing it to [ExpressionMapping]
paddingLengths.removeWhere((element) =>
element is! css.LengthTerm &&
element is! css.EmTerm &&
element is! css.RemTerm &&
element is! css.NumberTerm);
HtmlPaddings padding =
ExpressionMapping.expressionToBlockHtmlPadding(paddingLengths);
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
blockStart: padding.blockStart,
blockEnd: padding.blockEnd,
);
break;
case 'padding-block-end':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
blockEnd: ExpressionMapping.expressionToHtmlPadding(value.first),
);
break;
case 'padding-block-start':
style.padding = (style.padding ?? const HtmlPaddings()).copyWith(
blockStart: ExpressionMapping.expressionToHtmlPadding(value.first),
);
break;
case 'text-align':
style.textAlign =
ExpressionMapping.expressionToTextAlign(value.first);
break;
case 'text-decoration':
List<css.LiteralTerm?>? textDecorationList =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [textDecorationList], so make sure to remove those before passing it to [ExpressionMapping]
textDecorationList.removeWhere((element) =>
element == null ||
(element.text != "none" &&
element.text != "overline" &&
element.text != "underline" &&
element.text != "line-through"));
List<css.Expression?>? nullableList = value;
css.Expression? textDecorationColor;
textDecorationColor = nullableList.firstWhereOrNull((element) =>
element is css.HexColorTerm || element is css.FunctionTerm);
List<css.LiteralTerm?>? potentialStyles =
value.whereType<css.LiteralTerm>().toList();
/// List<css.LiteralTerm> might include other values than the ones we want for [textDecorationStyle], so make sure to remove those before passing it to [ExpressionMapping]
potentialStyles.removeWhere((element) =>
element == null ||
(element.text != "solid" &&
element.text != "double" &&
element.text != "dashed" &&
element.text != "dotted" &&
element.text != "wavy"));
css.LiteralTerm? textDecorationStyle =
potentialStyles.isNotEmpty ? potentialStyles.last : null;
style.textDecoration =
ExpressionMapping.expressionToTextDecorationLine(
textDecorationList);
if (textDecorationColor != null) {
style.textDecorationColor =
ExpressionMapping.expressionToColor(textDecorationColor) ??
style.textDecorationColor;
}
if (textDecorationStyle != null) {
style.textDecorationStyle =
ExpressionMapping.expressionToTextDecorationStyle(
textDecorationStyle);
}
break;
case 'text-decoration-color':
style.textDecorationColor =
ExpressionMapping.expressionToColor(value.first) ??
style.textDecorationColor;
break;
case 'text-decoration-line':
List<css.LiteralTerm?>? textDecorationList =
value.whereType<css.LiteralTerm>().toList();
style.textDecoration =
ExpressionMapping.expressionToTextDecorationLine(
textDecorationList);
break;
case 'text-decoration-style':
style.textDecorationStyle =
ExpressionMapping.expressionToTextDecorationStyle(
value.first as css.LiteralTerm);
break;
case 'text-shadow':
style.textShadow = ExpressionMapping.expressionToTextShadow(value);
break;
case 'text-transform':
final val = (value.first as css.LiteralTerm).text;
if (val == 'uppercase') {
style.textTransform = TextTransform.uppercase;
} else if (val == 'lowercase') {
style.textTransform = TextTransform.lowercase;
} else if (val == 'capitalize') {
style.textTransform = TextTransform.capitalize;
} else {
style.textTransform = TextTransform.none;
}
break;
case 'vertical-align':
style.verticalAlign =
ExpressionMapping.expressionToVerticalAlign(value.first);
break;
case 'width':
style.width =
ExpressionMapping.expressionToWidth(value.first) ?? style.width;
break;
}
}
});
return style;
}
//TODO refactor
Style? inlineCssToStyle(String? inlineStyle, OnCssParseError? errorHandler) {
var errors = <cssparser.Message>[];
final sheet = cssparser.parse("*{$inlineStyle}", errors: errors);
if (errors.isEmpty) {
final declarations = DeclarationVisitor().getDeclarations(sheet);
return declarationsToStyle(declarations["*"]!);
} else if (errorHandler != null) {
String? newCss = errorHandler.call(inlineStyle ?? "", errors);
if (newCss != null) {
return inlineCssToStyle(newCss, errorHandler);
}
}
return null;
}
//TODO refactor?
Map<String, Map<String, List<css.Expression>>> parseExternalCss(
String css, OnCssParseError? errorHandler) {
if (css.isEmpty) return {};
var errors = <cssparser.Message>[];
final sheet = cssparser.parse(css, errors: errors);
if (errors.isEmpty) {
return DeclarationVisitor().getDeclarations(sheet);
} else if (errorHandler != null) {
String? newCss = errorHandler.call(css, errors);
if (newCss != null) {
return parseExternalCss(newCss, errorHandler);
}
}
return {};
}
class DeclarationVisitor extends css.Visitor {
final Map<String, Map<String, List<css.Expression>>> _result = {};
final Map<String, List<css.Expression>> _properties = {};
late String _selector;
late String _currentProperty;
Map<String, Map<String, List<css.Expression>>> getDeclarations(
css.StyleSheet sheet) {
for (var element in sheet.topLevels) {
if (element.span != null) {
_selector = element.span!.text;
element.visit(this);
if (_result[_selector] != null) {
_properties.forEach((key, value) {
if (_result[_selector]![key] != null) {
_result[_selector]![key]!
.addAll(List<css.Expression>.from(value));
} else {
_result[_selector]![key] = List<css.Expression>.from(value);
}
});
} else {
_result[_selector] =
Map<String, List<css.Expression>>.from(_properties);
}
_properties.clear();
}
}
return _result;
}
@override
void visitDeclaration(css.Declaration node) {
_currentProperty = node.property;
_properties[_currentProperty] = <css.Expression>[];
node.expression!.visit(this);
}
@override
void visitExpressions(css.Expressions node) {
if (_properties[_currentProperty] != null) {
_properties[_currentProperty]!.addAll(node.expressions);
} else {
_properties[_currentProperty] = node.expressions;
}
}
}
//Mapping functions
class ExpressionMapping {
static Border expressionToBorder(
List<css.Expression?>? borderWidths,
List<css.LiteralTerm?>? borderStyles,
List<css.Expression?>? borderColors) {
CustomBorderSide left = CustomBorderSide();
CustomBorderSide top = CustomBorderSide();
CustomBorderSide right = CustomBorderSide();
CustomBorderSide bottom = CustomBorderSide();
if (borderWidths != null && borderWidths.isNotEmpty) {
top.width = expressionToBorderWidth(borderWidths.first);
if (borderWidths.length == 4) {
right.width = expressionToBorderWidth(borderWidths[1]);
bottom.width = expressionToBorderWidth(borderWidths[2]);
left.width = expressionToBorderWidth(borderWidths.last);
}
if (borderWidths.length == 3) {
left.width = expressionToBorderWidth(borderWidths[1]);
right.width = expressionToBorderWidth(borderWidths[1]);
bottom.width = expressionToBorderWidth(borderWidths.last);
}
if (borderWidths.length == 2) {
bottom.width = expressionToBorderWidth(borderWidths.first);
left.width = expressionToBorderWidth(borderWidths.last);
right.width = expressionToBorderWidth(borderWidths.last);
}
if (borderWidths.length == 1) {
bottom.width = expressionToBorderWidth(borderWidths.first);
left.width = expressionToBorderWidth(borderWidths.first);
right.width = expressionToBorderWidth(borderWidths.first);
}
}
if (borderStyles != null && borderStyles.isNotEmpty) {
top.style = expressionToBorderStyle(borderStyles.first);
if (borderStyles.length == 4) {
right.style = expressionToBorderStyle(borderStyles[1]);
bottom.style = expressionToBorderStyle(borderStyles[2]);
left.style = expressionToBorderStyle(borderStyles.last);
}
if (borderStyles.length == 3) {
left.style = expressionToBorderStyle(borderStyles[1]);
right.style = expressionToBorderStyle(borderStyles[1]);
bottom.style = expressionToBorderStyle(borderStyles.last);
}
if (borderStyles.length == 2) {
bottom.style = expressionToBorderStyle(borderStyles.first);
left.style = expressionToBorderStyle(borderStyles.last);
right.style = expressionToBorderStyle(borderStyles.last);
}
if (borderStyles.length == 1) {
bottom.style = expressionToBorderStyle(borderStyles.first);
left.style = expressionToBorderStyle(borderStyles.first);
right.style = expressionToBorderStyle(borderStyles.first);
}
}
if (borderColors != null && borderColors.isNotEmpty) {
top.color = expressionToColor(borderColors.first);
if (borderColors.length == 4) {
right.color = expressionToColor(borderColors[1]);
bottom.color = expressionToColor(borderColors[2]);
left.color = expressionToColor(borderColors.last);
}
if (borderColors.length == 3) {
left.color = expressionToColor(borderColors[1]);
right.color = expressionToColor(borderColors[1]);
bottom.color = expressionToColor(borderColors.last);
}
if (borderColors.length == 2) {
bottom.color = expressionToColor(borderColors.first);
left.color = expressionToColor(borderColors.last);
right.color = expressionToColor(borderColors.last);
}
if (borderColors.length == 1) {
bottom.color = expressionToColor(borderColors.first);
left.color = expressionToColor(borderColors.first);
right.color = expressionToColor(borderColors.first);
}
}
return Border(
top: BorderSide(
width: top.width,
color: top.color ?? Colors.black,
style: top.style),
right: BorderSide(
width: right.width,
color: right.color ?? Colors.black,
style: right.style),
bottom: BorderSide(
width: bottom.width,
color: bottom.color ?? Colors.black,
style: bottom.style),
left: BorderSide(
width: left.width,
color: left.color ?? Colors.black,
style: left.style));
}
static double expressionToBorderWidth(css.Expression? value) {
if (value is css.NumberTerm) {
return double.tryParse(value.text) ?? 1.0;
} else if (value is css.PercentageTerm) {
return (double.tryParse(value.text) ?? 400) / 100;
} else if (value is css.EmTerm) {
return double.tryParse(value.text) ?? 1.0;
} else if (value is css.RemTerm) {
return double.tryParse(value.text) ?? 1.0;
} else if (value is css.LengthTerm) {
return double.tryParse(
value.text.replaceAll(RegExp(r'\s+(\d+\.\d+)\s+'), '')) ??
1.0;
} else if (value is css.LiteralTerm) {
switch (value.text) {
case "thin":
return 2.0;
case "medium":
return 4.0;
case "thick":
return 6.0;
}
}
return 4.0;
}
static BorderStyle expressionToBorderStyle(css.LiteralTerm? value) {
if (value != null && value.text != "none" && value.text != "hidden") {
return BorderStyle.solid;
}
return BorderStyle.none;
}
static Color? expressionToColor(css.Expression? value) {
if (value != null) {
if (value is css.HexColorTerm) {
return stringToColor(value.text);
} else if (value is css.FunctionTerm) {
if (value.text == 'rgba' || value.text == 'rgb') {
return rgbOrRgbaToColor(value.span!.text);
} else if (value.text == 'hsla' || value.text == 'hsl') {
return hslToRgbToColor(value.span!.text);
}
} else if (value is css.LiteralTerm) {
return namedColorToColor(value.text);
}
}
return null;
}
static TextDirection expressionToDirection(css.Expression value) {
if (value is css.LiteralTerm) {
switch (value.text) {
case "ltr":
return TextDirection.ltr;
case "rtl":
return TextDirection.rtl;
}
}
return TextDirection.ltr;
}
static Display expressionToDisplay(css.Expression value) {
if (value is css.LiteralTerm) {
switch (value.text) {
case 'block':
return Display.block;
case 'inline-block':
return Display.inlineBlock;
case 'inline':
return Display.inline;
case 'list-item':
return Display.listItem;
case 'none':
return Display.none;
}
}
return Display.inline;
}
static List<FontFeature> expressionToFontFeatureSettings(
List<css.Expression> value) {
List<FontFeature> fontFeatures = [];
for (int i = 0; i < value.length; i++) {
css.Expression exp = value[i];
if (exp is css.LiteralTerm) {
if (exp.text != "on" &&
exp.text != "off" &&
exp.text != "1" &&
exp.text != "0") {
if (i < value.length - 1) {
css.Expression nextExp = value[i + 1];
if (nextExp is css.LiteralTerm &&
(nextExp.text == "on" ||
nextExp.text == "off" ||
nextExp.text == "1" ||
nextExp.text == "0")) {
fontFeatures.add(FontFeature(exp.text,
nextExp.text == "on" || nextExp.text == "1" ? 1 : 0));
} else {
fontFeatures.add(FontFeature.enable(exp.text));
}
} else {
fontFeatures.add(FontFeature.enable(exp.text));
}
}
}
}
List<FontFeature> finalFontFeatures = fontFeatures.toSet().toList();
return finalFontFeatures;
}
static FontSize? expressionToFontSize(css.Expression value) {
if (value is css.NumberTerm) {
return FontSize(double.tryParse(value.text) ?? 16, Unit.px);
} else if (value is css.PercentageTerm) {
return FontSize(double.tryParse(value.text) ?? 100, Unit.percent);
} else if (value is css.EmTerm) {
return FontSize(double.tryParse(value.text) ?? 1, Unit.em);
// } else if (value is css.RemTerm) { TODO
// return FontSize.rem(double.tryParse(value.text) ?? 1, Unit.em);
} else if (value is css.LengthTerm) {
return FontSize(double.tryParse(
value.text.replaceAll(RegExp(r'\s+(\d+\.\d+)\s+'), '')) ??
16);
} else if (value is css.LiteralTerm) {
switch (value.text) {
case "xx-small":
return FontSize.xxSmall;
case "x-small":
return FontSize.xSmall;
case "small":
return FontSize.small;
case "medium":
return FontSize.medium;
case "large":
return FontSize.large;
case "x-large":
return FontSize.xLarge;
case "xx-large":
return FontSize.xxLarge;
}
}
return null;
}
static FontStyle expressionToFontStyle(css.Expression value) {
if (value is css.LiteralTerm) {
switch (value.text) {
case "italic":
case "oblique":
return FontStyle.italic;
}
return FontStyle.normal;
}
return FontStyle.normal;
}