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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Regenerates a Dart file with a class containing IconData constants.
// See https://github.com/flutter/flutter/wiki/Updating-Material-Design-Fonts-&-Icons
// Should be idempotent with:
// dart dev/tools/update_icons.dart --new-codepoints bin/cache/artifacts/material_fonts/codepoints
import 'dart:collection';
import 'dart:convert' show LineSplitter;
import 'dart:io';
import 'package:args/args.dart';
import 'package:meta/meta.dart';
import 'package:path/path.dart' as path;
const String _iconsPathOption = 'icons';
const String _iconsTemplatePathOption = 'icons-template';
const String _newCodepointsPathOption = 'new-codepoints';
const String _oldCodepointsPathOption = 'old-codepoints';
const String _fontFamilyOption = 'font-family';
const String _possibleStyleSuffixesOption = 'style-suffixes';
const String _classNameOption = 'class-name';
const String _enforceSafetyChecks = 'enforce-safety-checks';
const String _dryRunOption = 'dry-run';
const String _defaultIconsPath = 'packages/flutter/lib/src/material/icons.dart';
const String _defaultNewCodepointsPath = 'codepoints';
const String _defaultOldCodepointsPath = 'bin/cache/artifacts/material_fonts/codepoints';
const String _defaultFontFamily = 'MaterialIcons';
const List<String> _defaultPossibleStyleSuffixes = <String>[
'_outlined',
'_rounded',
'_sharp',
];
const String _defaultClassName = 'Icons';
const String _defaultDemoFilePath = '/tmp/new_icons_demo.dart';
const String _beginGeneratedMark = '// BEGIN GENERATED ICONS';
const String _endGeneratedMark = '// END GENERATED ICONS';
const String _beginPlatformAdaptiveGeneratedMark = '// BEGIN GENERATED PLATFORM ADAPTIVE ICONS';
const String _endPlatformAdaptiveGeneratedMark = '// END GENERATED PLATFORM ADAPTIVE ICONS';
const Map<String, List<String>> _platformAdaptiveIdentifiers = <String, List<String>>{
// Mapping of Flutter IDs to an Android/agnostic ID and an iOS ID.
// Flutter IDs can be anything, but should be chosen to be agnostic.
'arrow_back': <String>['arrow_back', 'arrow_back_ios'],
'arrow_forward': <String>['arrow_forward', 'arrow_forward_ios'],
'flip_camera': <String>['flip_camera_android', 'flip_camera_ios'],
'more': <String>['more_vert', 'more_horiz'],
'share': <String>['share', 'ios_share'],
};
// Rewrite certain Flutter IDs (numbers) using prefix matching.
const Map<String, String> _identifierPrefixRewrites = <String, String>{
'1': 'one_',
'2': 'two_',
'3': 'three_',
'4': 'four_',
'5': 'five_',
'6': 'six_',
'7': 'seven_',
'8': 'eight_',
'9': 'nine_',
'10': 'ten_',
'11': 'eleven_',
'12': 'twelve_',
'13': 'thirteen_',
'14': 'fourteen_',
'15': 'fifteen_',
'16': 'sixteen_',
'17': 'seventeen_',
'18': 'eighteen_',
'19': 'nineteen_',
'20': 'twenty_',
'21': 'twenty_one_',
'22': 'twenty_two_',
'23': 'twenty_three_',
'24': 'twenty_four_',
'30': 'thirty_',
'60': 'sixty_',
'123': 'onetwothree',
'360': 'threesixty',
'2d': 'twod',
'3d': 'threed',
'3d_rotation': 'threed_rotation',
};
// Rewrite certain Flutter IDs (reserved keywords) using exact matching.
const Map<String, String> _identifierExactRewrites = <String, String>{
'class': 'class_',
'new': 'new_',
'switch': 'switch_',
'try': 'try_sms_star',
'door_back': 'door_back_door',
'door_front': 'door_front_door',
};
const Set<String> _iconsMirroredWhenRTL = <String>{
// This list is obtained from:
// https://developers.google.com/fonts/docs/material_icons#which_icons_should_be_mirrored_for_rtl
'arrow_back',
'arrow_back_ios',
'arrow_forward',
'arrow_forward_ios',
'arrow_left',
'arrow_right',
'assignment',
'assignment_return',
'backspace',
'battery_unknown',
'call_made',
'call_merge',
'call_missed',
'call_missed_outgoing',
'call_received',
'call_split',
'chevron_left',
'chevron_right',
'chrome_reader_mode',
'device_unknown',
'dvr',
'event_note',
'featured_play_list',
'featured_video',
'first_page',
'flight_land',
'flight_takeoff',
'format_indent_decrease',
'format_indent_increase',
'format_list_bulleted',
'forward',
'functions',
'help',
'help_outline',
'input',
'keyboard_backspace',
'keyboard_tab',
'label',
'label_important',
'label_outline',
'last_page',
'launch',
'list',
'live_help',
'mobile_screen_share',
'multiline_chart',
'navigate_before',
'navigate_next',
'next_week',
'note',
'open_in',
'playlist_add',
'queue_music',
'redo',
'reply',
'reply_all',
'screen_share',
'send',
'short_text',
'show_chart',
'sort',
'star_half',
'subject',
'trending_flat',
'toc',
'trending_down',
'trending_up',
'undo',
'view_list',
'view_quilt',
'wrap_text',
};
void main(List<String> args) {
// If we're run from the `tools` dir, set the cwd to the repo root.
if (path.basename(Directory.current.path) == 'tools') {
Directory.current = Directory.current.parent.parent;
}
final ArgResults argResults = _handleArguments(args);
final File iconsFile = File(path.normalize(path.absolute(argResults[_iconsPathOption] as String)));
if (!iconsFile.existsSync()) {
stderr.writeln('Error: Icons file not found: ${iconsFile.path}');
exit(1);
}
final File iconsTemplateFile = File(path.normalize(path.absolute(argResults[_iconsTemplatePathOption] as String)));
if (!iconsTemplateFile.existsSync()) {
stderr.writeln('Error: Icons template file not found: ${iconsTemplateFile.path}');
exit(1);
}
final File newCodepointsFile = File(argResults[_newCodepointsPathOption] as String);
if (!newCodepointsFile.existsSync()) {
stderr.writeln('Error: New codepoints file not found: ${newCodepointsFile.path}');
exit(1);
}
final File oldCodepointsFile = File(argResults[_oldCodepointsPathOption] as String);
if (!oldCodepointsFile.existsSync()) {
stderr.writeln('Error: Old codepoints file not found: ${oldCodepointsFile.path}');
exit(1);
}
final String newCodepointsString = newCodepointsFile.readAsStringSync();
final Map<String, String> newTokenPairMap = stringToTokenPairMap(newCodepointsString);
final String oldCodepointsString = oldCodepointsFile.readAsStringSync();
final Map<String, String> oldTokenPairMap = stringToTokenPairMap(oldCodepointsString);
stderr.writeln('Performing safety checks');
final bool isSuperset = testIsSuperset(newTokenPairMap, oldTokenPairMap);
final bool isStable = testIsStable(newTokenPairMap, oldTokenPairMap);
if ((!isSuperset || !isStable) && argResults[_enforceSafetyChecks] as bool) {
exit(1);
}
final String iconsTemplateContents = iconsTemplateFile.readAsStringSync();
stderr.writeln("Generating icons ${argResults[_dryRunOption] as bool ? '' : 'to ${iconsFile.path}'}");
final String newIconsContents = _regenerateIconsFile(
iconsTemplateContents,
newTokenPairMap,
argResults[_fontFamilyOption] as String,
argResults[_classNameOption] as String,
argResults[_enforceSafetyChecks] as bool,
);
if (argResults[_dryRunOption] as bool) {
stdout.write(newIconsContents);
} else {
iconsFile.writeAsStringSync(newIconsContents);
final SplayTreeMap<String, String> sortedNewTokenPairMap = SplayTreeMap<String, String>.of(newTokenPairMap);
_regenerateCodepointsFile(oldCodepointsFile, sortedNewTokenPairMap);
sortedNewTokenPairMap.removeWhere((String key, String value) => oldTokenPairMap.containsKey(key));
_generateIconDemo(File(_defaultDemoFilePath), sortedNewTokenPairMap);
}
}
ArgResults _handleArguments(List<String> args) {
final ArgParser argParser = ArgParser()
..addOption(_iconsPathOption,
defaultsTo: _defaultIconsPath,
help: 'Location of the material icons file')
..addOption(_iconsTemplatePathOption,
defaultsTo: _defaultIconsPath,
help:
'Location of the material icons file template. Usually the same as --$_iconsPathOption')
..addOption(_newCodepointsPathOption,
defaultsTo: _defaultNewCodepointsPath,
help: 'Location of the new codepoints directory')
..addOption(_oldCodepointsPathOption,
defaultsTo: _defaultOldCodepointsPath,
help: 'Location of the existing codepoints directory')
..addOption(_fontFamilyOption,
defaultsTo: _defaultFontFamily,
help: 'The font family to use for the IconData constants')
..addMultiOption(_possibleStyleSuffixesOption,
defaultsTo: _defaultPossibleStyleSuffixes,
help: 'A comma-separated list of suffixes (typically an optional '
'family + a style) e.g. _outlined, _monoline_filled')
..addOption(_classNameOption,
defaultsTo: _defaultClassName,
help: 'The containing class for all icons')
..addFlag(_enforceSafetyChecks,
defaultsTo: true,
help: 'Whether to exit if safety checks fail (e.g. codepoints are missing or unstable')
..addFlag(_dryRunOption);
argParser.addFlag('help', abbr: 'h', negatable: false, callback: (bool help) {
if (help) {
print(argParser.usage);
exit(1);
}
});
return argParser.parse(args);
}
Map<String, String> stringToTokenPairMap(String codepointData) {
final Iterable<String> cleanData = LineSplitter.split(codepointData)
.map((String line) => line.trim())
.where((String line) => line.isNotEmpty);
final Map<String, String> pairs = <String, String>{};
for (final String line in cleanData) {
final List<String> tokens = line.split(' ');
if (tokens.length != 2) {
throw FormatException('Unexpected codepoint data: $line');
}
pairs.putIfAbsent(tokens[0], () => tokens[1]);
}
return pairs;
}
String _regenerateIconsFile(
String templateFileContents,
Map<String, String> tokenPairMap,
String fontFamily,
String className,
bool enforceSafetyChecks,
) {
final List<Icon> newIcons = tokenPairMap.entries
.map((MapEntry<String, String> entry) =>
Icon(entry, fontFamily: fontFamily, className: className))
.toList();
newIcons.sort((Icon a, Icon b) => a._compareTo(b));
final StringBuffer buf = StringBuffer();
bool generating = false;
for (final String line in LineSplitter.split(templateFileContents)) {
if (!generating) {
buf.writeln(line);
}
// Generate for PlatformAdaptiveIcons
if (line.contains(_beginPlatformAdaptiveGeneratedMark)) {
generating = true;
final List<String> platformAdaptiveDeclarations = <String>[];
_platformAdaptiveIdentifiers.forEach((String flutterId, List<String> ids) {
// Automatically finds and generates all icon declarations.
for (final String style in <String>['', '_outlined', '_rounded', '_sharp']) {
try {
final Icon agnosticIcon = newIcons.firstWhere(
(Icon icon) => icon.id == '${ids[0]}$style',
orElse: () => throw ids[0]);
final Icon iOSIcon = newIcons.firstWhere(
(Icon icon) => icon.id == '${ids[1]}$style',
orElse: () => throw ids[1]);
platformAdaptiveDeclarations.add(
agnosticIcon.platformAdaptiveDeclaration('$flutterId$style', iOSIcon),
);
} catch (e) {
if (style == '') {
// Throw an error for baseline icons.
stderr.writeln("❌ Platform adaptive icon '$e' not found.");
if (enforceSafetyChecks) {
stderr.writeln('Safety checks failed');
exit(1);
}
} else {
// Ignore errors for styled icons since some don't exist.
}
}
}
});
buf.write(platformAdaptiveDeclarations.join());
} else if (line.contains(_endPlatformAdaptiveGeneratedMark)) {
generating = false;
buf.writeln(line);
}
// Generate for Icons
if (line.contains(_beginGeneratedMark)) {
generating = true;
final String iconDeclarationsString = newIcons.map((Icon icon) => icon.fullDeclaration).join();
buf.write(iconDeclarationsString);
} else if (line.contains(_endGeneratedMark)) {
generating = false;
buf.writeln(line);
}
}
return buf.toString();
}
@visibleForTesting
bool testIsSuperset(Map<String, String> newCodepoints, Map<String, String> oldCodepoints) {
final Set<String> newCodepointsSet = newCodepoints.keys.toSet();
final Set<String> oldCodepointsSet = oldCodepoints.keys.toSet();
final int diff = newCodepointsSet.length - oldCodepointsSet.length;
if (diff > 0) {
stderr.writeln('🆕 $diff new codepoints: ${newCodepointsSet.difference(oldCodepointsSet)}');
}
if (!newCodepointsSet.containsAll(oldCodepointsSet)) {
stderr.writeln(
'❌ new codepoints file does not contain all ${oldCodepointsSet.length} '
'existing codepoints. Missing: ${oldCodepointsSet.difference(newCodepointsSet)}');
return false;
} else {
stderr.writeln('✅ new codepoints file contains all ${oldCodepointsSet.length} existing codepoints');
}
return true;
}
@visibleForTesting
bool testIsStable(Map<String, String> newCodepoints, Map<String, String> oldCodepoints) {
final int oldCodepointsCount = oldCodepoints.length;
final List<String> unstable = <String>[];
oldCodepoints.forEach((String key, String value) {
if (newCodepoints.containsKey(key)) {
if (value != newCodepoints[key]) {
unstable.add(key);
}
}
});
if (unstable.isNotEmpty) {
stderr.writeln('❌ out of $oldCodepointsCount existing codepoints, ${unstable.length} were unstable: $unstable');
return false;
} else {
stderr.writeln('✅ all existing $oldCodepointsCount codepoints are stable');
return true;
}
}
void _regenerateCodepointsFile(File oldCodepointsFile, Map<String, String> tokenPairMap) {
stderr.writeln('Regenerating old codepoints file ${oldCodepointsFile.path}');
final StringBuffer buf = StringBuffer();
tokenPairMap.forEach((String key, String value) => buf.writeln('$key $value'));
oldCodepointsFile.writeAsStringSync(buf.toString());
}
void _generateIconDemo(File demoFilePath, Map<String, String> tokenPairMap) {
if (tokenPairMap.isEmpty) {
stderr.writeln('No new icons, skipping generating icon demo');
return;
}
stderr.writeln('Generating icon demo at $_defaultDemoFilePath');
final StringBuffer newIconUsages = StringBuffer();
for (final MapEntry<String, String> entry in tokenPairMap.entries) {
newIconUsages.writeln(Icon(entry).usage);
}
final String demoFileContents = '''
import 'package:flutter/material.dart';
void main() => runApp(const IconDemo());
class IconDemo extends StatelessWidget {
const IconDemo({ Key? key }) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
home: Scaffold(
body: Wrap(
children: const [
$newIconUsages
],
),
),
);
}
}
''';
demoFilePath.writeAsStringSync(demoFileContents);
}
class Icon {
// Parse tokenPair (e.g. {"6_ft_apart_outlined": "e004"}).
Icon(MapEntry<String, String> tokenPair, {
this.fontFamily = _defaultFontFamily,
this.possibleStyleSuffixes = _defaultPossibleStyleSuffixes,
this.className = _defaultClassName,
}) {
id = tokenPair.key;
hexCodepoint = tokenPair.value;
// Determine family and HTML class suffix for Dartdoc.
if (id.endsWith('_gm_outlined')) {
dartdocFamily = 'GM';
dartdocHtmlSuffix = '-outlined';
} else if (id.endsWith('_gm_filled')) {
dartdocFamily = 'GM';
dartdocHtmlSuffix = '-filled';
} else if (id.endsWith('_monoline_outlined')) {
dartdocFamily = 'Monoline';
dartdocHtmlSuffix = '-outlined';
} else if (id.endsWith('_monoline_filled')) {
dartdocFamily = 'Monoline';
dartdocHtmlSuffix = '-filled';
} else {
dartdocFamily = 'material';
if (id.endsWith('_baseline')) {
id = _removeLast(id, '_baseline');
dartdocHtmlSuffix = '';
} else if (id.endsWith('_outlined')) {
dartdocHtmlSuffix = '-outlined';
} else if (id.endsWith('_rounded')) {
dartdocHtmlSuffix = '-round';
} else if (id.endsWith('_sharp')) {
dartdocHtmlSuffix = '-sharp';
}
}
_generateShortId();
_generateFlutterId();
}
late String id; // e.g. 5g, 5g_outlined, 5g_rounded, 5g_sharp
late String shortId; // e.g. 5g
late String flutterId; // e.g. five_g, five_g_outlined, five_g_rounded, five_g_sharp
late String hexCodepoint; // e.g. e547
late String dartdocFamily; // e.g. material
late String dartdocHtmlSuffix = ''; // The suffix for the 'material-icons' HTML class.
String fontFamily; // The IconData font family.
List<String> possibleStyleSuffixes; // A list of possible suffixes e.g. _outlined, _monoline_filled.
String className; // The containing class.
String get name => shortId.replaceAll('_', ' ').trim();
String get style => dartdocHtmlSuffix == '' ? '' : ' (${dartdocHtmlSuffix.replaceFirst('-', '')})';
String get dartDoc =>
'<i class="material-icons$dartdocHtmlSuffix md-36">$shortId</i> — $dartdocFamily icon named "$name"$style';
String get usage => 'Icon($className.$flutterId),';
bool get isMirroredInRTL {
// Remove common suffixes (e.g. "_new" or "_alt") from the shortId.
final String normalizedShortId = shortId.replaceAll(RegExp(r'_(new|alt|off|on)$'), '');
return _iconsMirroredWhenRTL.any((String shortIdMirroredWhenRTL) => normalizedShortId == shortIdMirroredWhenRTL);
}
String get declaration =>
"static const IconData $flutterId = IconData(0x$hexCodepoint, fontFamily: '$fontFamily'${isMirroredInRTL ? ', matchTextDirection: true' : ''});";
String get fullDeclaration => '''
/// $dartDoc.
$declaration
''';
String platformAdaptiveDeclaration(String fullFlutterId, Icon iOSIcon) => '''
/// Platform-adaptive icon for $dartDoc and ${iOSIcon.dartDoc}.;
IconData get $fullFlutterId => !_isCupertino() ? $className.$flutterId : $className.${iOSIcon.flutterId};
''';
@override
String toString() => id;
/// Analogous to [String.compareTo]
int _compareTo(Icon b) {
if (shortId == b.shortId) {
// Sort a regular icon before its variants.
return id.length - b.id.length;
}
return shortId.compareTo(b.shortId);
}
static String _removeLast(String string, String toReplace) {
return string.replaceAll(RegExp('$toReplace\$'), '');
}
/// See [shortId].
void _generateShortId() {
shortId = id;
for (final String styleSuffix in possibleStyleSuffixes) {
shortId = _removeLast(shortId, styleSuffix);
if (shortId != id) {
break;
}
}
}
/// See [flutterId].
void _generateFlutterId() {
flutterId = id;
// Exact identifier rewrites.
for (final MapEntry<String, String> rewritePair in _identifierExactRewrites.entries) {
if (shortId == rewritePair.key) {
flutterId = id.replaceFirst(
rewritePair.key,
_identifierExactRewrites[rewritePair.key]!,
);
}
}
// Prefix identifier rewrites.
for (final MapEntry<String, String> rewritePair in _identifierPrefixRewrites.entries) {
if (id.startsWith(rewritePair.key)) {
flutterId = id.replaceFirst(
rewritePair.key,
_identifierPrefixRewrites[rewritePair.key]!,
);
}
}
// Prevent double underscores.
flutterId = flutterId.replaceAll('__', '_');
}
}