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104 lines
3.7 KiB
Dart
104 lines
3.7 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'dart:io';
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abstract class TokenTemplate {
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const TokenTemplate(this.fileName, this.tokens);
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static const String beginGeneratedComment = '''
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// BEGIN GENERATED TOKEN PROPERTIES
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''';
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static const String headerComment = '''
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// Generated code to the end of this file. Do not edit by hand.
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// These defaults are generated from the Material Design Token
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// database by the script dev/tools/gen_defaults/bin/gen_defaults.dart.
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''';
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static const String endGeneratedComment = '''
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// END GENERATED TOKEN PROPERTIES
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''';
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final String fileName;
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final Map<String, dynamic> tokens;
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/// Replace or append the contents of the file with the text from [generate].
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///
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/// If the file already contains generated block at the end, it will
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/// be replaced by the [generate] output. Otherwise the content will
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/// just be appended to the end of the file.
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Future<void> updateFile() async {
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String contents = File(fileName).readAsStringSync();
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final int previousGeneratedIndex = contents.indexOf(beginGeneratedComment);
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if (previousGeneratedIndex != -1) {
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contents = contents.substring(0, previousGeneratedIndex);
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}
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final StringBuffer buffer = StringBuffer(contents);
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buffer.write(beginGeneratedComment);
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buffer.write(headerComment);
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buffer.write(generate());
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buffer.write(endGeneratedComment);
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File(fileName).writeAsStringSync(buffer.toString());
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}
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/// Provide the generated content for the template.
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///
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/// This abstract method needs to be implemented by subclasses
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/// to provide the content that [updateFile] will append to the
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/// bottom of the file.
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String generate();
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/// Generate a [ColorScheme] color name for the given component token.
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///
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/// If there is an opacity specified for the given component, it will
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/// apply that opacity to the component's color.
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String color(String componentToken) {
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final String tokenColor = '$componentToken.color';
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final String tokenOpacity = '$componentToken.opacity';
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String value = '${tokens[tokenColor]!}';
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if (tokens.containsKey(tokenOpacity)) {
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final String opacity = tokens[tokens[tokenOpacity]!]!.toString();
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value += '.withOpacity($opacity)';
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}
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return value;
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}
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/// Generate an elevation value for the given component token.
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String elevation(String componentToken) {
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return tokens[tokens['$componentToken.elevation']!]!.toString();
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}
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/// Generate a shape constant for the given component token.
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///
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/// Currently supports family:
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/// - "SHAPE_FAMILY_ROUNDED_CORNERS" which maps to [RoundedRectangleBorder].
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/// - "SHAPE_FAMILY_CIRCULAR" which maps to a [StadiumBorder].
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String shape(String componentToken) {
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final Map<String, dynamic> shape = tokens[tokens['$componentToken.shape']!]! as Map<String, dynamic>;
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switch (shape['family']) {
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case 'SHAPE_FAMILY_ROUNDED_CORNERS':
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return 'const RoundedRectangleBorder(borderRadius: '
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'BorderRadius.only('
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'topLeft: Radius.circular(${shape['topLeft']}), '
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'topRight: Radius.circular(${shape['topRight']}), '
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'bottomLeft: Radius.circular(${shape['bottomLeft']}), '
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'bottomRight: Radius.circular(${shape['bottomRight']})))';
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case 'SHAPE_FAMILY_CIRCULAR':
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return 'const StadiumBorder()';
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}
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print('Unsupported shape family type: ${shape['family']} for $componentToken');
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return '';
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}
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/// Generate a [TextTheme] text style name for the given component token.
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String textStyle(String componentToken) {
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return tokens['$componentToken.text-style']!.toString();
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}
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}
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