terry@google.com
6d41224b82
BUG= R=sigmund@google.com Review URL: https://codereview.chromium.org//126063003 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@31578 260f80e4-7a28-3924-810f-c04153c831b5
2674 lines
82 KiB
Dart
2674 lines
82 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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library csslib.parser;
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import 'dart:math' as math;
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import 'package:source_maps/span.dart' show SourceFile, Span, FileSpan;
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import "visitor.dart";
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import 'src/messages.dart';
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import 'src/options.dart';
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part 'src/analyzer.dart';
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part 'src/polyfill.dart';
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part 'src/property.dart';
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part 'src/token.dart';
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part 'src/tokenizer_base.dart';
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part 'src/tokenizer.dart';
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part 'src/tokenkind.dart';
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/** Used for parser lookup ahead (used for nested selectors Less support). */
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class ParserState extends TokenizerState {
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final Token peekToken;
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final Token previousToken;
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ParserState(this.peekToken, this.previousToken, Tokenizer tokenizer)
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: super(tokenizer);
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}
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void _createMessages({List<Message> errors, List<String> options}) {
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if (errors == null) errors = [];
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if (options == null) {
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options = ['--no-colors', 'memory'];
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}
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var opt = PreprocessorOptions.parse(options);
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messages = new Messages(options: opt, printHandler: errors.add);
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}
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/** CSS checked mode enabled. */
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bool get isChecked => messages.options.checked;
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// TODO(terry): Remove nested name parameter.
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/** Parse and analyze the CSS file. */
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StyleSheet compile(var input, {List<Message> errors, List<String> options,
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bool nested: true,
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bool polyfill: false,
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List<StyleSheet> includes: null}) {
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if (includes == null) {
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includes = [];
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}
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var source = _inputAsString(input);
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_createMessages(errors: errors, options: options);
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var file = new SourceFile.text(null, source);
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var tree = new _Parser(file, source).parse();
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analyze([tree], errors: errors, options: options);
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if (polyfill) {
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var processCss = new PolyFill(messages, true);
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processCss.process(tree, includes: includes);
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}
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return tree;
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}
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/** Analyze the CSS file. */
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void analyze(List<StyleSheet> styleSheets,
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{List<Message> errors, List<String> options}) {
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_createMessages(errors: errors, options: options);
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new Analyzer(styleSheets, messages).run();
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}
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/**
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* Parse the [input] CSS stylesheet into a tree. The [input] can be a [String],
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* or [List<int>] of bytes and returns a [StyleSheet] AST. The optional
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* [errors] list will contain each error/warning as a [Message].
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*/
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StyleSheet parse(var input, {List<Message> errors, List<String> options}) {
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var source = _inputAsString(input);
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_createMessages(errors: errors, options: options);
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var file = new SourceFile.text(null, source);
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return new _Parser(file, source).parse();
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}
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/**
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* Parse the [input] CSS selector into a tree. The [input] can be a [String],
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* or [List<int>] of bytes and returns a [StyleSheet] AST. The optional
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* [errors] list will contain each error/warning as a [Message].
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*/
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StyleSheet selector(var input, {List<Message> errors}) {
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var source = _inputAsString(input);
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_createMessages(errors: errors);
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var file = new SourceFile.text(null, source);
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return new _Parser(file, source).parseSelector();
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}
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String _inputAsString(var input) {
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String source;
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if (input is String) {
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source = input;
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} else if (input is List<int>) {
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// TODO(terry): The parse function needs an "encoding" argument and will
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// default to whatever encoding CSS defaults to.
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//
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// Here's some info about CSS encodings:
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// http://www.w3.org/International/questions/qa-css-charset.en.php
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//
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// As JMesserly suggests it will probably need a "preparser" html5lib
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// (encoding_parser.dart) that interprets the bytes as ASCII and scans for
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// @charset. But for now an "encoding" argument would work. Often the
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// HTTP header will indicate the correct encoding.
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//
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// See encoding helpers at: package:html5lib/lib/src/char_encodings.dart
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// These helpers can decode in different formats given an encoding name
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// (mostly unicode, ascii, windows-1252 which is html5 default encoding).
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source = new String.fromCharCodes(input);
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} else {
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// TODO(terry): Support RandomAccessFile using console.
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throw new ArgumentError("'source' must be a String or "
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"List<int> (of bytes). RandomAccessFile not supported from this "
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"simple interface");
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}
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return source;
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}
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// TODO(terry): Consider removing this class when all usages can be eliminated
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// or replaced with compile API.
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/** Public parsing interface for csslib. */
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class Parser {
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final _Parser _parser;
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Parser(SourceFile file, String text, {int start: 0, String baseUrl}) :
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_parser = new _Parser(file, text, start: start, baseUrl: baseUrl);
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StyleSheet parse() => _parser.parse();
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}
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/** A simple recursive descent parser for CSS. */
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class _Parser {
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final Tokenizer tokenizer;
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/** Base url of CSS file. */
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final String _baseUrl;
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/**
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* File containing the source being parsed, used to report errors with
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* source-span locations.
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*/
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final SourceFile file;
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Token _previousToken;
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Token _peekToken;
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_Parser(SourceFile file, String text, {int start: 0, String baseUrl})
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: this.file = file,
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_baseUrl = baseUrl,
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tokenizer = new Tokenizer(file, text, true, start) {
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_peekToken = tokenizer.next();
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}
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/** Main entry point for parsing an entire CSS file. */
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StyleSheet parse() {
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List<TreeNode> productions = [];
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int start = _peekToken.start;
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while (!_maybeEat(TokenKind.END_OF_FILE) && !_peekKind(TokenKind.RBRACE)) {
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// TODO(terry): Need to handle charset.
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var directive = processDirective();
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if (directive != null) {
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productions.add(directive);
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_maybeEat(TokenKind.SEMICOLON);
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} else {
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RuleSet ruleset = processRuleSet();
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if (ruleset != null) {
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productions.add(ruleset);
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} else {
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break;
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}
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}
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}
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checkEndOfFile();
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return new StyleSheet(productions, _makeSpan(start));
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}
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/** Main entry point for parsing a simple selector sequence. */
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StyleSheet parseSelector() {
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List<TreeNode> productions = [];
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int start = _peekToken.start;
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while (!_maybeEat(TokenKind.END_OF_FILE) && !_peekKind(TokenKind.RBRACE)) {
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var selector = processSelector();
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if (selector != null) {
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productions.add(selector);
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}
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}
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checkEndOfFile();
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return new StyleSheet.selector(productions, _makeSpan(start));
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}
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/** Generate an error if [file] has not been completely consumed. */
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void checkEndOfFile() {
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if (!(_peekKind(TokenKind.END_OF_FILE) ||
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_peekKind(TokenKind.INCOMPLETE_COMMENT))) {
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_error('premature end of file unknown CSS', _peekToken.span);
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}
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}
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/** Guard to break out of parser when an unexpected end of file is found. */
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// TODO(jimhug): Failure to call this method can lead to inifinite parser
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// loops. Consider embracing exceptions for more errors to reduce
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// the danger here.
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bool isPrematureEndOfFile() {
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if (_maybeEat(TokenKind.END_OF_FILE)) {
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_error('unexpected end of file', _peekToken.span);
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return true;
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} else {
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return false;
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}
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}
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///////////////////////////////////////////////////////////////////
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// Basic support methods
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///////////////////////////////////////////////////////////////////
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int _peek() {
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return _peekToken.kind;
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}
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Token _next({unicodeRange : false}) {
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_previousToken = _peekToken;
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_peekToken = tokenizer.next(unicodeRange: unicodeRange);
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return _previousToken;
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}
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bool _peekKind(int kind) {
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return _peekToken.kind == kind;
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}
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/* Is the next token a legal identifier? This includes pseudo-keywords. */
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bool _peekIdentifier() {
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return TokenKind.isIdentifier(_peekToken.kind);
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}
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/** Marks the parser/tokenizer look ahead to support Less nested selectors. */
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ParserState get _mark =>
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new ParserState(_peekToken, _previousToken, tokenizer);
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/** Restores the parser/tokenizer state to state remembered by _mark. */
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void _restore(ParserState markedData) {
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tokenizer.restore(markedData);
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_peekToken = markedData.peekToken;
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_previousToken = markedData.previousToken;
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}
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bool _maybeEat(int kind, {unicodeRange : false}) {
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if (_peekToken.kind == kind) {
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_previousToken = _peekToken;
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_peekToken = tokenizer.next(unicodeRange: unicodeRange);
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return true;
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} else {
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return false;
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}
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}
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void _eat(int kind, {unicodeRange : false}) {
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if (!_maybeEat(kind, unicodeRange: unicodeRange)) {
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_errorExpected(TokenKind.kindToString(kind));
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}
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}
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void _eatSemicolon() {
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_eat(TokenKind.SEMICOLON);
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}
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void _errorExpected(String expected) {
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var tok = _next();
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var message;
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try {
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message = 'expected $expected, but found $tok';
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} catch (e) {
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message = 'parsing error expected $expected';
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}
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_error(message, tok.span);
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}
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void _error(String message, Span location) {
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if (location == null) {
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location = _peekToken.span;
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}
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messages.error(message, location);
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}
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void _warning(String message, Span location) {
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if (location == null) {
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location = _peekToken.span;
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}
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messages.warning(message, location);
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}
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Span _makeSpan(int start) {
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// TODO(terry): there are places where we are creating spans before we eat
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// the tokens, so using _previousToken.end is not always valid.
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var end = _previousToken != null && _previousToken.end >= start
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? _previousToken.end : _peekToken.end;
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return file.span(start, end);
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}
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///////////////////////////////////////////////////////////////////
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// Top level productions
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///////////////////////////////////////////////////////////////////
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/**
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* The media_query_list production below replaces the media_list production
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* from CSS2 the new grammar is:
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*
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* media_query_list
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* : S* [media_query [ ',' S* media_query ]* ]?
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* media_query
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* : [ONLY | NOT]? S* media_type S* [ AND S* expression ]*
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* | expression [ AND S* expression ]*
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* media_type
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* : IDENT
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* expression
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* : '(' S* media_feature S* [ ':' S* expr ]? ')' S*
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* media_feature
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* : IDENT
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*/
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List<MediaQuery> processMediaQueryList() {
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var mediaQueries = [];
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bool firstTime = true;
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var mediaQuery;
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do {
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mediaQuery = processMediaQuery(firstTime == true);
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if (mediaQuery != null) {
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mediaQueries.add(mediaQuery);
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firstTime = false;
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continue;
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}
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// Any more more media types separated by comma.
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if (!_maybeEat(TokenKind.COMMA)) break;
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// Yep more media types start again.
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firstTime = true;
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} while ((!firstTime && mediaQuery != null) || firstTime);
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return mediaQueries;
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}
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MediaQuery processMediaQuery([bool startQuery = true]) {
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// Grammar: [ONLY | NOT]? S* media_type S*
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// [ AND S* MediaExpr ]* | MediaExpr [ AND S* MediaExpr ]*
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int start = _peekToken.start;
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// Is it a unary media operator?
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var op = _peekToken.text;
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var opLen = op.length;
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var unaryOp = TokenKind.matchMediaOperator(op, 0, opLen);
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if (unaryOp != -1) {
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if (isChecked) {
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if (startQuery &&
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unaryOp != TokenKind.MEDIA_OP_NOT ||
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unaryOp != TokenKind.MEDIA_OP_ONLY) {
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_warning("Only the unary operators NOT and ONLY allowed",
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_makeSpan(start));
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}
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if (!startQuery && unaryOp != TokenKind.MEDIA_OP_AND) {
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_warning("Only the binary AND operator allowed", _makeSpan(start));
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}
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}
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_next();
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start = _peekToken.start;
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}
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var type;
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if (startQuery && unaryOp != TokenKind.MEDIA_OP_AND) {
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// Get the media type.
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if (_peekIdentifier()) type = identifier();
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}
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var exprs = [];
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if (unaryOp == -1 || unaryOp == TokenKind.MEDIA_OP_AND) {
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var andOp = false;
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while (true) {
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var expr = processMediaExpression(andOp);
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if (expr == null) break;
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exprs.add(expr);
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op = _peekToken.text;
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opLen = op.length;
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andOp = TokenKind.matchMediaOperator(op, 0, opLen) ==
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TokenKind.MEDIA_OP_AND;
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if (!andOp) break;
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_next();
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}
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}
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if (unaryOp != -1 || type != null || exprs.length > 0) {
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return new MediaQuery(unaryOp, type, exprs, _makeSpan(start));
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}
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}
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MediaExpression processMediaExpression([bool andOperator = false]) {
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int start = _peekToken.start;
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// Grammar: '(' S* media_feature S* [ ':' S* expr ]? ')' S*
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if (_maybeEat(TokenKind.LPAREN)) {
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if (_peekIdentifier()) {
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var feature = identifier(); // Media feature.
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while (_maybeEat(TokenKind.COLON)) {
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int startExpr = _peekToken.start;
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var exprs = processExpr();
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if (_maybeEat(TokenKind.RPAREN)) {
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return new MediaExpression(andOperator, feature, exprs,
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_makeSpan(startExpr));
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} else if (isChecked) {
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_warning("Missing parenthesis around media expression",
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_makeSpan(start));
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return null;
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}
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}
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} else if (isChecked) {
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_warning("Missing media feature in media expression", _makeSpan(start));
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return null;
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}
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}
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}
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/**
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* Directive grammar:
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*
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* import: '@import' [string | URI] media_list?
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* media: '@media' media_query_list '{' ruleset '}'
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* page: '@page' [':' IDENT]? '{' declarations '}'
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* stylet: '@stylet' IDENT '{' ruleset '}'
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* media_query_list: IDENT [',' IDENT]
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* keyframes: '@-webkit-keyframes ...' (see grammar below).
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* font_face: '@font-face' '{' declarations '}'
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* namespace: '@namespace name url("xmlns")
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* host: '@host '{' ruleset '}'
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* mixin: '@mixin name [(args,...)] '{' declarations/ruleset '}'
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* include: '@include name [(@arg,@arg1)]
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* '@include name [(@arg...)]
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* content '@content'
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*/
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processDirective() {
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int start = _peekToken.start;
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var tokId = processVariableOrDirective();
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if (tokId is VarDefinitionDirective) return tokId;
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switch (tokId) {
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case TokenKind.DIRECTIVE_IMPORT:
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_next();
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// @import "uri_string" or @import url("uri_string") are identical; only
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// a url can follow an @import.
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String importStr;
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if (_peekIdentifier()) {
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var func = processFunction(identifier());
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if (func is UriTerm) {
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importStr = func.text;
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}
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} else {
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importStr = processQuotedString(false);
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}
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// Any medias?
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var medias = processMediaQueryList();
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if (importStr == null) {
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_error('missing import string', _peekToken.span);
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}
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return new ImportDirective(importStr.trim(), medias, _makeSpan(start));
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case TokenKind.DIRECTIVE_MEDIA:
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_next();
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// Any medias?
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var media = processMediaQueryList();
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List<TreeNode> rulesets = [];
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if (_maybeEat(TokenKind.LBRACE)) {
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while (!_maybeEat(TokenKind.END_OF_FILE)) {
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RuleSet ruleset = processRuleSet();
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if (ruleset == null) break;
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rulesets.add(ruleset);
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}
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if (!_maybeEat(TokenKind.RBRACE)) {
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_error('expected } after ruleset for @media', _peekToken.span);
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}
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} else {
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_error('expected { after media before ruleset', _peekToken.span);
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}
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return new MediaDirective(media, rulesets, _makeSpan(start));
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case TokenKind.DIRECTIVE_HOST:
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_next();
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List<TreeNode> rulesets = [];
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if (_maybeEat(TokenKind.LBRACE)) {
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while (!_maybeEat(TokenKind.END_OF_FILE)) {
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RuleSet ruleset = processRuleSet();
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if (ruleset == null) break;
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rulesets.add(ruleset);
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}
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if (!_maybeEat(TokenKind.RBRACE)) {
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_error('expected } after ruleset for @host', _peekToken.span);
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}
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} else {
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_error('expected { after host before ruleset', _peekToken.span);
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}
|
|
return new HostDirective(rulesets, _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_PAGE:
|
|
/*
|
|
* @page S* IDENT? pseudo_page?
|
|
* S* '{' S*
|
|
* [ declaration | margin ]?
|
|
* [ ';' S* [ declaration | margin ]? ]* '}' S*
|
|
*
|
|
* pseudo_page :
|
|
* ':' [ "left" | "right" | "first" ]
|
|
*
|
|
* margin :
|
|
* margin_sym S* '{' declaration [ ';' S* declaration? ]* '}' S*
|
|
*
|
|
* margin_sym : @top-left-corner, @top-left, @bottom-left, etc.
|
|
*
|
|
* See http://www.w3.org/TR/css3-page/#CSS21
|
|
*/
|
|
_next();
|
|
|
|
// Page name
|
|
var name;
|
|
if (_peekIdentifier()) {
|
|
name = identifier();
|
|
}
|
|
|
|
// Any pseudo page?
|
|
var pseudoPage;
|
|
if (_maybeEat(TokenKind.COLON)) {
|
|
if (_peekIdentifier()) {
|
|
pseudoPage = identifier();
|
|
// TODO(terry): Normalize pseudoPage to lowercase.
|
|
if (isChecked &&
|
|
!(pseudoPage.name == 'left' ||
|
|
pseudoPage.name == 'right' ||
|
|
pseudoPage.name == 'first')) {
|
|
_warning("Pseudo page must be left, top or first",
|
|
pseudoPage.span);
|
|
return null;
|
|
}
|
|
}
|
|
}
|
|
|
|
String pseudoName = pseudoPage is Identifier ? pseudoPage.name : '';
|
|
String ident = name is Identifier ? name.name : '';
|
|
return new PageDirective(ident, pseudoName,
|
|
processMarginsDeclarations(), _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_CHARSET:
|
|
// @charset S* STRING S* ';'
|
|
_next();
|
|
|
|
var charEncoding = processQuotedString(false);
|
|
if (isChecked && charEncoding == null) {
|
|
// Missing character encoding.
|
|
_warning('missing character encoding string', _makeSpan(start));
|
|
}
|
|
|
|
return new CharsetDirective(charEncoding, _makeSpan(start));
|
|
|
|
// TODO(terry): Workaround Dart2js bug continue not implemented in switch
|
|
// see https://code.google.com/p/dart/issues/detail?id=8270
|
|
/*
|
|
case TokenKind.DIRECTIVE_MS_KEYFRAMES:
|
|
// TODO(terry): For now only IE 10 (are base level) supports @keyframes,
|
|
// -moz- has only been optional since Oct 2012 release of Firefox, not
|
|
// all versions of webkit support @keyframes and opera doesn't yet
|
|
// support w/o -o- prefix. Add more warnings for other prefixes when
|
|
// they become optional.
|
|
if (isChecked) {
|
|
_warning('@-ms-keyframes should be @keyframes', _makeSpan(start));
|
|
}
|
|
continue keyframeDirective;
|
|
|
|
keyframeDirective:
|
|
*/
|
|
case TokenKind.DIRECTIVE_KEYFRAMES:
|
|
case TokenKind.DIRECTIVE_WEB_KIT_KEYFRAMES:
|
|
case TokenKind.DIRECTIVE_MOZ_KEYFRAMES:
|
|
case TokenKind.DIRECTIVE_O_KEYFRAMES:
|
|
// TODO(terry): Remove workaround when bug 8270 is fixed.
|
|
case TokenKind.DIRECTIVE_MS_KEYFRAMES:
|
|
if (tokId == TokenKind.DIRECTIVE_MS_KEYFRAMES && isChecked) {
|
|
_warning('@-ms-keyframes should be @keyframes', _makeSpan(start));
|
|
}
|
|
// TODO(terry): End of workaround.
|
|
|
|
/* Key frames grammar:
|
|
*
|
|
* @[browser]? keyframes [IDENT|STRING] '{' keyframes-blocks '}';
|
|
*
|
|
* browser: [-webkit-, -moz-, -ms-, -o-]
|
|
*
|
|
* keyframes-blocks:
|
|
* [keyframe-selectors '{' declarations '}']* ;
|
|
*
|
|
* keyframe-selectors:
|
|
* ['from'|'to'|PERCENTAGE] [',' ['from'|'to'|PERCENTAGE] ]* ;
|
|
*/
|
|
_next();
|
|
|
|
var name;
|
|
if (_peekIdentifier()) {
|
|
name = identifier();
|
|
}
|
|
|
|
_eat(TokenKind.LBRACE);
|
|
|
|
var keyframe = new KeyFrameDirective(tokId, name, _makeSpan(start));
|
|
|
|
do {
|
|
Expressions selectors = new Expressions(_makeSpan(start));
|
|
|
|
do {
|
|
var term = processTerm();
|
|
|
|
// TODO(terry): Only allow from, to and PERCENTAGE ...
|
|
|
|
selectors.add(term);
|
|
} while (_maybeEat(TokenKind.COMMA));
|
|
|
|
keyframe.add(new KeyFrameBlock(selectors, processDeclarations(),
|
|
_makeSpan(start)));
|
|
|
|
} while (!_maybeEat(TokenKind.RBRACE) && !isPrematureEndOfFile());
|
|
|
|
return keyframe;
|
|
|
|
case TokenKind.DIRECTIVE_FONTFACE:
|
|
_next();
|
|
return new FontFaceDirective(processDeclarations(), _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_STYLET:
|
|
/* Stylet grammar:
|
|
*
|
|
* @stylet IDENT '{'
|
|
* ruleset
|
|
* '}'
|
|
*/
|
|
_next();
|
|
|
|
var name;
|
|
if (_peekIdentifier()) {
|
|
name = identifier();
|
|
}
|
|
|
|
_eat(TokenKind.LBRACE);
|
|
|
|
List<TreeNode> productions = [];
|
|
|
|
start = _peekToken.start;
|
|
while (!_maybeEat(TokenKind.END_OF_FILE)) {
|
|
RuleSet ruleset = processRuleSet();
|
|
if (ruleset == null) {
|
|
break;
|
|
}
|
|
productions.add(ruleset);
|
|
}
|
|
|
|
_eat(TokenKind.RBRACE);
|
|
|
|
return new StyletDirective(name, productions, _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_NAMESPACE:
|
|
/* Namespace grammar:
|
|
*
|
|
* @namespace S* [namespace_prefix S*]? [STRING|URI] S* ';' S*
|
|
* namespace_prefix : IDENT
|
|
*
|
|
*/
|
|
_next();
|
|
|
|
var prefix;
|
|
if (_peekIdentifier()) {
|
|
prefix = identifier();
|
|
}
|
|
|
|
// The namespace URI can be either a quoted string url("uri_string")
|
|
// are identical.
|
|
String namespaceUri;
|
|
if (_peekIdentifier()) {
|
|
var func = processFunction(identifier());
|
|
if (func is UriTerm) {
|
|
namespaceUri = func.text;
|
|
}
|
|
} else {
|
|
if (prefix != null && prefix.name == 'url') {
|
|
var func = processFunction(prefix);
|
|
if (func is UriTerm) {
|
|
// @namespace url("");
|
|
namespaceUri = func.text;
|
|
prefix = null;
|
|
}
|
|
} else {
|
|
namespaceUri = processQuotedString(false);
|
|
}
|
|
}
|
|
|
|
return new NamespaceDirective(prefix != null ? prefix.name : '',
|
|
namespaceUri, _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_MIXIN:
|
|
return processMixin(start);
|
|
|
|
case TokenKind.DIRECTIVE_INCLUDE:
|
|
return processInclude( _makeSpan(start));
|
|
|
|
case TokenKind.DIRECTIVE_CONTENT:
|
|
// TODO(terry): TBD
|
|
_warning("@content not implemented.", _makeSpan(start));
|
|
return null;
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Parse the mixin beginning token offset [start]. Returns a [MixinDefinition]
|
|
* node.
|
|
*
|
|
* Mixin grammar:
|
|
*
|
|
* @mixin IDENT [(args,...)] '{'
|
|
* [ruleset | property | directive]*
|
|
* '}'
|
|
*/
|
|
MixinDefinition processMixin(int start) {
|
|
_next();
|
|
|
|
var name = identifier();
|
|
|
|
List<VarDefinitionDirective> params = [];
|
|
// Any parameters?
|
|
if (_maybeEat(TokenKind.LPAREN)) {
|
|
var mustHaveParam = false;
|
|
var keepGoing = true;
|
|
while (keepGoing) {
|
|
var varDef = processVariableOrDirective(mixinParameter: true);
|
|
if (varDef is VarDefinitionDirective || varDef is VarDefinition) {
|
|
params.add(varDef);
|
|
} else if (mustHaveParam) {
|
|
_warning("Expecting parameter", _makeSpan(_peekToken.start));
|
|
keepGoing = false;
|
|
}
|
|
if (_maybeEat(TokenKind.COMMA)) {
|
|
mustHaveParam = true;
|
|
continue;
|
|
}
|
|
keepGoing = !_maybeEat(TokenKind.RPAREN);
|
|
}
|
|
}
|
|
|
|
_eat(TokenKind.LBRACE);
|
|
|
|
List<TreeNode> productions = [];
|
|
List<TreeNode> declarations = [];
|
|
var mixinDirective;
|
|
|
|
start = _peekToken.start;
|
|
while (!_maybeEat(TokenKind.END_OF_FILE)) {
|
|
var directive = processDirective();
|
|
if (directive != null) {
|
|
productions.add(directive);
|
|
continue;
|
|
}
|
|
|
|
var declGroup = processDeclarations(checkBrace: false);
|
|
var decls = [];
|
|
if (declGroup.declarations.any((decl) {
|
|
return decl is Declaration &&
|
|
decl is! IncludeMixinAtDeclaration;
|
|
})) {
|
|
var newDecls = [];
|
|
productions.forEach((include) {
|
|
// If declGroup has items that are declarations then we assume
|
|
// this mixin is a declaration mixin not a top-level mixin.
|
|
if (include is IncludeDirective) {
|
|
newDecls.add(new IncludeMixinAtDeclaration(include,
|
|
include.span));
|
|
} else {
|
|
_warning("Error mixing of top-level vs declarations mixins",
|
|
_makeSpan(include));
|
|
}
|
|
});
|
|
declGroup.declarations.insertAll(0, newDecls);
|
|
productions = [];
|
|
} else {
|
|
// Declarations are just @includes make it a list of productions
|
|
// not a declaration group (anything else is a ruleset). Make it a
|
|
// list of productions, not a declaration group.
|
|
for (var decl in declGroup.declarations) {
|
|
productions.add(decl is IncludeMixinAtDeclaration ?
|
|
decl.include : decl);
|
|
};
|
|
declGroup.declarations.clear();
|
|
}
|
|
|
|
if (declGroup.declarations.isNotEmpty) {
|
|
if (productions.isEmpty) {
|
|
mixinDirective = new MixinDeclarationDirective(name.name, params,
|
|
false, declGroup, _makeSpan(start));
|
|
break;
|
|
} else {
|
|
for (var decl in declGroup.declarations) {
|
|
productions.add(decl is IncludeMixinAtDeclaration ?
|
|
decl.include : decl);
|
|
}
|
|
}
|
|
} else {
|
|
mixinDirective = new MixinRulesetDirective(name.name, params,
|
|
false, productions, _makeSpan(start));
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (productions.isNotEmpty) {
|
|
mixinDirective = new MixinRulesetDirective(name.name, params,
|
|
false, productions, _makeSpan(start));
|
|
}
|
|
|
|
_eat(TokenKind.RBRACE);
|
|
|
|
return mixinDirective;
|
|
}
|
|
|
|
/**
|
|
* Returns a VarDefinitionDirective or VarDefinition if a varaible otherwise
|
|
* return the token id of a directive or -1 if neither.
|
|
*/
|
|
processVariableOrDirective({bool mixinParameter: false}) {
|
|
int start = _peekToken.start;
|
|
|
|
var tokId = _peek();
|
|
// Handle case for @ directive (where there's a whitespace between the @
|
|
// sign and the directive name. Technically, it's not valid grammar but
|
|
// a number of CSS tests test for whitespace between @ and name.
|
|
if (tokId == TokenKind.AT) {
|
|
Token tok = _next();
|
|
tokId = _peek();
|
|
if (_peekIdentifier()) {
|
|
// Is it a directive?
|
|
var directive = _peekToken.text;
|
|
var directiveLen = directive.length;
|
|
tokId = TokenKind.matchDirectives(directive, 0, directiveLen);
|
|
if (tokId == -1) {
|
|
tokId = TokenKind.matchMarginDirectives(directive, 0, directiveLen);
|
|
}
|
|
}
|
|
|
|
if (tokId == -1) {
|
|
if (messages.options.lessSupport) {
|
|
// Less compatibility:
|
|
// @name: value; => var-name: value; (VarDefinition)
|
|
// property: @name; => property: var(name); (VarUsage)
|
|
var name;
|
|
if (_peekIdentifier()) {
|
|
name = identifier();
|
|
}
|
|
|
|
Expressions exprs;
|
|
if (mixinParameter && _maybeEat(TokenKind.COLON)) {
|
|
exprs = processExpr();
|
|
} else if (!mixinParameter) {
|
|
_eat(TokenKind.COLON);
|
|
exprs = processExpr();
|
|
}
|
|
|
|
var span = _makeSpan(start);
|
|
return new VarDefinitionDirective(
|
|
new VarDefinition(name, exprs, span), span);
|
|
} else if (isChecked) {
|
|
_error('unexpected directive @$_peekToken', _peekToken.span);
|
|
}
|
|
}
|
|
} else if (mixinParameter && _peekToken.kind == TokenKind.VAR_DEFINITION) {
|
|
_next();
|
|
var definedName;
|
|
if (_peekIdentifier()) definedName = identifier();
|
|
|
|
Expressions exprs;
|
|
if (_maybeEat(TokenKind.COLON)) {
|
|
exprs = processExpr();
|
|
}
|
|
|
|
return new VarDefinition(definedName, exprs, _makeSpan(start));
|
|
}
|
|
|
|
return tokId;
|
|
}
|
|
|
|
IncludeDirective processInclude(Span span, {bool eatSemiColon: true}) {
|
|
/* Stylet grammar:
|
|
*
|
|
* @include IDENT [(args,...)];
|
|
*/
|
|
_next();
|
|
|
|
var name;
|
|
if (_peekIdentifier()) {
|
|
name = identifier();
|
|
}
|
|
|
|
var params = [];
|
|
|
|
// Any parameters? Parameters can be multiple terms per argument e.g.,
|
|
// 3px solid yellow, green is two parameters:
|
|
// 1. 3px solid yellow
|
|
// 2. green
|
|
// the first has 3 terms and the second has 1 term.
|
|
if (_maybeEat(TokenKind.LPAREN)) {
|
|
var terms = [];
|
|
var expr;
|
|
var keepGoing = true;
|
|
while (keepGoing && (expr = processTerm()) != null) {
|
|
// VarUsage is returns as a list
|
|
terms.add(expr is List ? expr[0] : expr);
|
|
keepGoing = !_peekKind(TokenKind.RPAREN);
|
|
if (keepGoing) {
|
|
if (_maybeEat(TokenKind.COMMA)) {
|
|
params.add(terms);
|
|
terms = [];
|
|
}
|
|
}
|
|
}
|
|
params.add(terms);
|
|
_maybeEat(TokenKind.RPAREN);
|
|
}
|
|
|
|
if (eatSemiColon) {
|
|
_eat(TokenKind.SEMICOLON);
|
|
}
|
|
|
|
return new IncludeDirective(name.name, params, span);
|
|
}
|
|
|
|
RuleSet processRuleSet([SelectorGroup selectorGroup]) {
|
|
if (selectorGroup == null) {
|
|
selectorGroup = processSelectorGroup();
|
|
}
|
|
if (selectorGroup != null) {
|
|
return new RuleSet(selectorGroup, processDeclarations(),
|
|
selectorGroup.span);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Look ahead to see if what should be a declaration is really a selector.
|
|
* If it's a selector than it's a nested selector. This support's Less'
|
|
* nested selector syntax (requires a look ahead). E.g.,
|
|
*
|
|
* div {
|
|
* width : 20px;
|
|
* span {
|
|
* color: red;
|
|
* }
|
|
* }
|
|
*
|
|
* Two tag name selectors div and span equivalent to:
|
|
*
|
|
* div {
|
|
* width: 20px;
|
|
* }
|
|
* div span {
|
|
* color: red;
|
|
* }
|
|
*
|
|
* Return [null] if no selector or [SelectorGroup] if a selector was parsed.
|
|
*/
|
|
SelectorGroup _nestedSelector() {
|
|
Messages oldMessages = messages;
|
|
_createMessages();
|
|
|
|
var markedData = _mark;
|
|
|
|
// Look a head do we have a nested selector instead of a declaration?
|
|
SelectorGroup selGroup = processSelectorGroup();
|
|
|
|
var nestedSelector = selGroup != null && _peekKind(TokenKind.LBRACE) &&
|
|
messages.messages.isEmpty;
|
|
|
|
if (!nestedSelector) {
|
|
// Not a selector so restore the world.
|
|
_restore(markedData);
|
|
messages = oldMessages;
|
|
return null;
|
|
} else {
|
|
// Remember any messages from look ahead.
|
|
oldMessages.mergeMessages(messages);
|
|
messages = oldMessages;
|
|
return selGroup;
|
|
}
|
|
}
|
|
|
|
DeclarationGroup processDeclarations({bool checkBrace: true}) {
|
|
int start = _peekToken.start;
|
|
|
|
if (checkBrace) _eat(TokenKind.LBRACE);
|
|
|
|
List decls = [];
|
|
List dartStyles = []; // List of latest styles exposed to Dart.
|
|
|
|
do {
|
|
var selectorGroup = _nestedSelector();
|
|
while (selectorGroup != null) {
|
|
// Nested selector so process as a ruleset.
|
|
var ruleset = processRuleSet(selectorGroup);
|
|
decls.add(ruleset);
|
|
selectorGroup = _nestedSelector();
|
|
}
|
|
|
|
Declaration decl = processDeclaration(dartStyles);
|
|
if (decl != null) {
|
|
if (decl.hasDartStyle) {
|
|
var newDartStyle = decl.dartStyle;
|
|
|
|
// Replace or add latest Dart style.
|
|
bool replaced = false;
|
|
for (var i = 0; i < dartStyles.length; i++) {
|
|
var dartStyle = dartStyles[i];
|
|
if (dartStyle.isSame(newDartStyle)) {
|
|
dartStyles[i] = newDartStyle;
|
|
replaced = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!replaced) {
|
|
dartStyles.add(newDartStyle);
|
|
}
|
|
}
|
|
decls.add(decl);
|
|
}
|
|
} while (_maybeEat(TokenKind.SEMICOLON));
|
|
|
|
if (checkBrace) _eat(TokenKind.RBRACE);
|
|
|
|
// Fixup declaration to only have dartStyle that are live for this set of
|
|
// declarations.
|
|
for (var decl in decls) {
|
|
if (decl is Declaration) {
|
|
if (decl.hasDartStyle && dartStyles.indexOf(decl.dartStyle) < 0) {
|
|
// Dart style not live, ignore these styles in this Declarations.
|
|
decl.dartStyle = null;
|
|
}
|
|
}
|
|
}
|
|
|
|
return new DeclarationGroup(decls, _makeSpan(start));
|
|
}
|
|
|
|
List<DeclarationGroup> processMarginsDeclarations() {
|
|
List groups = [];
|
|
|
|
int start = _peekToken.start;
|
|
|
|
_eat(TokenKind.LBRACE);
|
|
|
|
List<Declaration> decls = [];
|
|
List dartStyles = []; // List of latest styles exposed to Dart.
|
|
|
|
do {
|
|
switch (_peek()) {
|
|
case TokenKind.MARGIN_DIRECTIVE_TOPLEFTCORNER:
|
|
case TokenKind.MARGIN_DIRECTIVE_TOPLEFT:
|
|
case TokenKind.MARGIN_DIRECTIVE_TOPCENTER:
|
|
case TokenKind.MARGIN_DIRECTIVE_TOPRIGHT:
|
|
case TokenKind.MARGIN_DIRECTIVE_TOPRIGHTCORNER:
|
|
case TokenKind.MARGIN_DIRECTIVE_BOTTOMLEFTCORNER:
|
|
case TokenKind.MARGIN_DIRECTIVE_BOTTOMLEFT:
|
|
case TokenKind.MARGIN_DIRECTIVE_BOTTOMCENTER:
|
|
case TokenKind.MARGIN_DIRECTIVE_BOTTOMRIGHT:
|
|
case TokenKind.MARGIN_DIRECTIVE_BOTTOMRIGHTCORNER:
|
|
case TokenKind.MARGIN_DIRECTIVE_LEFTTOP:
|
|
case TokenKind.MARGIN_DIRECTIVE_LEFTMIDDLE:
|
|
case TokenKind.MARGIN_DIRECTIVE_LEFTBOTTOM:
|
|
case TokenKind.MARGIN_DIRECTIVE_RIGHTTOP:
|
|
case TokenKind.MARGIN_DIRECTIVE_RIGHTMIDDLE:
|
|
case TokenKind.MARGIN_DIRECTIVE_RIGHTBOTTOM:
|
|
// Margin syms processed.
|
|
// margin :
|
|
// margin_sym S* '{' declaration [ ';' S* declaration? ]* '}' S*
|
|
//
|
|
// margin_sym : @top-left-corner, @top-left, @bottom-left, etc.
|
|
var marginSym = _peek();
|
|
|
|
_next();
|
|
|
|
var declGroup = processDeclarations();
|
|
if (declGroup != null) {
|
|
groups.add(new MarginGroup(marginSym, declGroup.declarations,
|
|
_makeSpan(start)));
|
|
}
|
|
break;
|
|
default:
|
|
Declaration decl = processDeclaration(dartStyles);
|
|
if (decl != null) {
|
|
if (decl.hasDartStyle) {
|
|
var newDartStyle = decl.dartStyle;
|
|
|
|
// Replace or add latest Dart style.
|
|
bool replaced = false;
|
|
for (var i = 0; i < dartStyles.length; i++) {
|
|
var dartStyle = dartStyles[i];
|
|
if (dartStyle.isSame(newDartStyle)) {
|
|
dartStyles[i] = newDartStyle;
|
|
replaced = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!replaced) {
|
|
dartStyles.add(newDartStyle);
|
|
}
|
|
}
|
|
decls.add(decl);
|
|
}
|
|
_maybeEat(TokenKind.SEMICOLON);
|
|
break;
|
|
}
|
|
} while (!_maybeEat(TokenKind.RBRACE) && !isPrematureEndOfFile());
|
|
|
|
// Fixup declaration to only have dartStyle that are live for this set of
|
|
// declarations.
|
|
for (var decl in decls) {
|
|
if (decl.hasDartStyle && dartStyles.indexOf(decl.dartStyle) < 0) {
|
|
// Dart style not live, ignore these styles in this Declarations.
|
|
decl.dartStyle = null;
|
|
}
|
|
}
|
|
|
|
if (decls.length > 0) {
|
|
groups.add(new DeclarationGroup(decls, _makeSpan(start)));
|
|
}
|
|
|
|
return groups;
|
|
}
|
|
|
|
SelectorGroup processSelectorGroup() {
|
|
List<Selector> selectors = [];
|
|
int start = _peekToken.start;
|
|
do {
|
|
Selector selector = processSelector();
|
|
if (selector != null) {
|
|
selectors.add(selector);
|
|
}
|
|
} while (_maybeEat(TokenKind.COMMA));
|
|
|
|
if (selectors.length > 0) {
|
|
return new SelectorGroup(selectors, _makeSpan(start));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return list of selectors
|
|
*/
|
|
Selector processSelector() {
|
|
var simpleSequences = <SimpleSelectorSequence>[];
|
|
var start = _peekToken.start;
|
|
while (true) {
|
|
// First item is never descendant make sure it's COMBINATOR_NONE.
|
|
var selectorItem = simpleSelectorSequence(simpleSequences.length == 0);
|
|
if (selectorItem != null) {
|
|
simpleSequences.add(selectorItem);
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (simpleSequences.length > 0) {
|
|
return new Selector(simpleSequences, _makeSpan(start));
|
|
}
|
|
}
|
|
|
|
simpleSelectorSequence(bool forceCombinatorNone) {
|
|
var start = _peekToken.start;
|
|
var combinatorType = TokenKind.COMBINATOR_NONE;
|
|
var thisOperator = false;
|
|
|
|
switch (_peek()) {
|
|
case TokenKind.PLUS:
|
|
_eat(TokenKind.PLUS);
|
|
combinatorType = TokenKind.COMBINATOR_PLUS;
|
|
break;
|
|
case TokenKind.GREATER:
|
|
_eat(TokenKind.GREATER);
|
|
combinatorType = TokenKind.COMBINATOR_GREATER;
|
|
break;
|
|
case TokenKind.TILDE:
|
|
_eat(TokenKind.TILDE);
|
|
combinatorType = TokenKind.COMBINATOR_TILDE;
|
|
break;
|
|
case TokenKind.AMPERSAND:
|
|
_eat(TokenKind.AMPERSAND);
|
|
thisOperator = true;
|
|
break;
|
|
}
|
|
|
|
// Check if WHITESPACE existed between tokens if so we're descendent.
|
|
if (combinatorType == TokenKind.COMBINATOR_NONE && !forceCombinatorNone) {
|
|
if (this._previousToken != null &&
|
|
this._previousToken.end != this._peekToken.start) {
|
|
combinatorType = TokenKind.COMBINATOR_DESCENDANT;
|
|
}
|
|
}
|
|
|
|
var span = _makeSpan(start);
|
|
var simpleSel = thisOperator ?
|
|
new ElementSelector(new ThisOperator(span), span) : simpleSelector();
|
|
if (simpleSel == null &&
|
|
(combinatorType == TokenKind.COMBINATOR_PLUS ||
|
|
combinatorType == TokenKind.COMBINATOR_GREATER ||
|
|
combinatorType == TokenKind.COMBINATOR_TILDE)) {
|
|
// For "+ &", "~ &" or "> &" a selector sequence with no name is needed
|
|
// so that the & will have a combinator too. This is needed to
|
|
// disambiguate selector expressions:
|
|
// .foo&:hover combinator before & is NONE
|
|
// .foo & combinator before & is DESCDENDANT
|
|
// .foo > & combinator before & is GREATER
|
|
simpleSel = new ElementSelector(new Identifier("", span), span);
|
|
}
|
|
if (simpleSel != null) {
|
|
return new SimpleSelectorSequence(simpleSel, span, combinatorType);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Simple selector grammar:
|
|
*
|
|
* simple_selector_sequence
|
|
* : [ type_selector | universal ]
|
|
* [ HASH | class | attrib | pseudo | negation ]*
|
|
* | [ HASH | class | attrib | pseudo | negation ]+
|
|
* type_selector
|
|
* : [ namespace_prefix ]? element_name
|
|
* namespace_prefix
|
|
* : [ IDENT | '*' ]? '|'
|
|
* element_name
|
|
* : IDENT
|
|
* universal
|
|
* : [ namespace_prefix ]? '*'
|
|
* class
|
|
* : '.' IDENT
|
|
*/
|
|
simpleSelector() {
|
|
// TODO(terry): Nathan makes a good point parsing of namespace and element
|
|
// are essentially the same (asterisk or identifier) other
|
|
// than the error message for element. Should consolidate the
|
|
// code.
|
|
// TODO(terry): Need to handle attribute namespace too.
|
|
var first;
|
|
int start = _peekToken.start;
|
|
switch (_peek()) {
|
|
case TokenKind.ASTERISK:
|
|
// Mark as universal namespace.
|
|
var tok = _next();
|
|
first = new Wildcard(_makeSpan(tok.start));
|
|
break;
|
|
case TokenKind.IDENTIFIER:
|
|
first = identifier();
|
|
break;
|
|
default:
|
|
// Expecting simple selector.
|
|
// TODO(terry): Could be a synthesized token like value, etc.
|
|
if (TokenKind.isKindIdentifier(_peek())) {
|
|
first = identifier();
|
|
} else if (_peekKind(TokenKind.SEMICOLON)) {
|
|
// Can't be a selector if we found a semi-colon.
|
|
return null;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (_maybeEat(TokenKind.NAMESPACE)) {
|
|
var element;
|
|
switch (_peek()) {
|
|
case TokenKind.ASTERISK:
|
|
// Mark as universal element
|
|
var tok = _next();
|
|
element = new Wildcard(_makeSpan(tok.start));
|
|
break;
|
|
case TokenKind.IDENTIFIER:
|
|
element = identifier();
|
|
break;
|
|
default:
|
|
_error('expected element name or universal(*), but found $_peekToken',
|
|
_peekToken.span);
|
|
break;
|
|
}
|
|
|
|
return new NamespaceSelector(first,
|
|
new ElementSelector(element, element.span), _makeSpan(start));
|
|
} else if (first != null) {
|
|
return new ElementSelector(first, _makeSpan(start));
|
|
} else {
|
|
// Check for HASH | class | attrib | pseudo | negation
|
|
return simpleSelectorTail();
|
|
}
|
|
}
|
|
|
|
bool _anyWhiteSpaceBeforePeekToken(int kind) {
|
|
if (_previousToken != null && _peekToken != null &&
|
|
_previousToken.kind == kind) {
|
|
// If end of previous token isn't same as the start of peek token then
|
|
// there's something between these tokens probably whitespace.
|
|
return _previousToken.end != _peekToken.start;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* type_selector | universal | HASH | class | attrib | pseudo
|
|
*/
|
|
simpleSelectorTail() {
|
|
// Check for HASH | class | attrib | pseudo | negation
|
|
var start = _peekToken.start;
|
|
switch (_peek()) {
|
|
case TokenKind.HASH:
|
|
_eat(TokenKind.HASH);
|
|
|
|
var hasWhiteSpace = false;
|
|
if (_anyWhiteSpaceBeforePeekToken(TokenKind.HASH)) {
|
|
_warning("Not a valid ID selector expected #id", _makeSpan(start));
|
|
hasWhiteSpace = true;
|
|
}
|
|
if (_peekIdentifier()) {
|
|
var id = identifier();
|
|
if (hasWhiteSpace) {
|
|
// Generate bad selector id (normalized).
|
|
id.name = " ${id.name}";
|
|
}
|
|
return new IdSelector(id, _makeSpan(start));
|
|
}
|
|
return null;
|
|
case TokenKind.DOT:
|
|
_eat(TokenKind.DOT);
|
|
|
|
bool hasWhiteSpace = false;
|
|
if (_anyWhiteSpaceBeforePeekToken(TokenKind.DOT)) {
|
|
_warning("Not a valid class selector expected .className",
|
|
_makeSpan(start));
|
|
hasWhiteSpace = true;
|
|
}
|
|
var id = identifier();
|
|
if (hasWhiteSpace) {
|
|
// Generate bad selector class (normalized).
|
|
id.name = " ${id.name}";
|
|
}
|
|
return new ClassSelector(id, _makeSpan(start));
|
|
case TokenKind.COLON:
|
|
// :pseudo-class ::pseudo-element
|
|
return processPseudoSelector(start);
|
|
case TokenKind.LBRACK:
|
|
return processAttribute();
|
|
case TokenKind.DOUBLE:
|
|
_error('name must start with a alpha character, but found a number',
|
|
_peekToken.span);
|
|
_next();
|
|
break;
|
|
}
|
|
}
|
|
|
|
processPseudoSelector(int start) {
|
|
// :pseudo-class ::pseudo-element
|
|
// TODO(terry): '::' should be token.
|
|
_eat(TokenKind.COLON);
|
|
var pseudoElement = _maybeEat(TokenKind.COLON);
|
|
|
|
// TODO(terry): If no identifier specified consider optimizing out the
|
|
// : or :: and making this a normal selector. For now,
|
|
// create an empty pseudoName.
|
|
var pseudoName;
|
|
if (_peekIdentifier()) {
|
|
pseudoName = identifier();
|
|
} else {
|
|
return null;
|
|
}
|
|
|
|
// Functional pseudo?
|
|
if (_maybeEat(TokenKind.LPAREN)) {
|
|
if (!pseudoElement && pseudoName.name.toLowerCase() == 'not') {
|
|
// Negation : ':NOT(' S* negation_arg S* ')'
|
|
var negArg = simpleSelector();
|
|
|
|
_eat(TokenKind.RPAREN);
|
|
return new NegationSelector(negArg, _makeSpan(start));
|
|
} else {
|
|
// Handle function expression.
|
|
var span = _makeSpan(start);
|
|
var expr = processSelectorExpression();
|
|
|
|
// Used during selector look-a-head if not a SelectorExpression is
|
|
// bad.
|
|
if (expr is! SelectorExpression) {
|
|
_errorExpected("CSS expression");
|
|
return null;
|
|
}
|
|
|
|
_eat(TokenKind.RPAREN);
|
|
return (pseudoElement) ?
|
|
new PseudoElementFunctionSelector(pseudoName, expr, span) :
|
|
new PseudoClassFunctionSelector(pseudoName, expr, span);
|
|
}
|
|
}
|
|
|
|
// TODO(terry): Need to handle specific pseudo class/element name and
|
|
// backward compatible names that are : as well as :: as well as
|
|
// parameters. Current, spec uses :: for pseudo-element and : for
|
|
// pseudo-class. However, CSS2.1 allows for : to specify old
|
|
// pseudo-elements (:first-line, :first-letter, :before and :after) any
|
|
// new pseudo-elements defined would require a ::.
|
|
return pseudoElement ?
|
|
new PseudoElementSelector(pseudoName, _makeSpan(start)) :
|
|
new PseudoClassSelector(pseudoName, _makeSpan(start));
|
|
}
|
|
|
|
/**
|
|
* In CSS3, the expressions are identifiers, strings, or of the form "an+b".
|
|
*
|
|
* : [ [ PLUS | '-' | DIMENSION | NUMBER | STRING | IDENT ] S* ]+
|
|
*
|
|
* num [0-9]+|[0-9]*\.[0-9]+
|
|
* PLUS '+'
|
|
* DIMENSION {num}{ident}
|
|
* NUMBER {num}
|
|
*/
|
|
processSelectorExpression() {
|
|
var start = _peekToken.start;
|
|
|
|
var expression = new SelectorExpression(_makeSpan(start));
|
|
|
|
Token termToken;
|
|
var value;
|
|
|
|
// Special parsing for expressions in pseudo functions. Minus is used as
|
|
// operator not identifier.
|
|
tokenizer.selectorExpression = true;
|
|
|
|
var keepParsing = true;
|
|
while (keepParsing) {
|
|
switch (_peek()) {
|
|
case TokenKind.PLUS:
|
|
start = _peekToken.start;
|
|
termToken = _next();
|
|
expression.add(new OperatorPlus(_makeSpan(start)));
|
|
break;
|
|
case TokenKind.MINUS:
|
|
start = _peekToken.start;
|
|
termToken = _next();
|
|
expression.add(new OperatorMinus(_makeSpan(start)));
|
|
break;
|
|
case TokenKind.INTEGER:
|
|
termToken = _next();
|
|
value = int.parse(termToken.text);
|
|
break;
|
|
case TokenKind.DOUBLE:
|
|
termToken = _next();
|
|
value = double.parse(termToken.text);
|
|
break;
|
|
case TokenKind.SINGLE_QUOTE:
|
|
value = processQuotedString(false);
|
|
value = "'${_escapeString(value, single: true)}'";
|
|
return new LiteralTerm(value, value, _makeSpan(start));
|
|
case TokenKind.DOUBLE_QUOTE:
|
|
value = processQuotedString(false);
|
|
value = '"${_escapeString(value)}"';
|
|
return new LiteralTerm(value, value, _makeSpan(start));
|
|
case TokenKind.IDENTIFIER:
|
|
value = identifier(); // Snarf up the ident we'll remap, maybe.
|
|
break;
|
|
default:
|
|
keepParsing = false;
|
|
}
|
|
|
|
if (keepParsing && value != null) {
|
|
var unitTerm;
|
|
// Don't process the dimension if MINUS or PLUS is next.
|
|
if (_peek() != TokenKind.MINUS && _peek() != TokenKind.PLUS) {
|
|
unitTerm = processDimension(termToken, value, _makeSpan(start));
|
|
}
|
|
if (unitTerm == null) {
|
|
unitTerm = new LiteralTerm(value, value.name, _makeSpan(start));
|
|
}
|
|
expression.add(unitTerm);
|
|
|
|
value = null;
|
|
}
|
|
}
|
|
|
|
tokenizer.selectorExpression = false;
|
|
|
|
return expression;
|
|
}
|
|
|
|
// Attribute grammar:
|
|
//
|
|
// attributes :
|
|
// '[' S* IDENT S* [ ATTRIB_MATCHES S* [ IDENT | STRING ] S* ]? ']'
|
|
//
|
|
// ATTRIB_MATCHES :
|
|
// [ '=' | INCLUDES | DASHMATCH | PREFIXMATCH | SUFFIXMATCH | SUBSTRMATCH ]
|
|
//
|
|
// INCLUDES: '~='
|
|
//
|
|
// DASHMATCH: '|='
|
|
//
|
|
// PREFIXMATCH: '^='
|
|
//
|
|
// SUFFIXMATCH: '$='
|
|
//
|
|
// SUBSTRMATCH: '*='
|
|
//
|
|
//
|
|
AttributeSelector processAttribute() {
|
|
var start = _peekToken.start;
|
|
|
|
if (_maybeEat(TokenKind.LBRACK)) {
|
|
var attrName = identifier();
|
|
|
|
int op;
|
|
switch (_peek()) {
|
|
case TokenKind.EQUALS:
|
|
case TokenKind.INCLUDES: // ~=
|
|
case TokenKind.DASH_MATCH: // |=
|
|
case TokenKind.PREFIX_MATCH: // ^=
|
|
case TokenKind.SUFFIX_MATCH: // $=
|
|
case TokenKind.SUBSTRING_MATCH: // *=
|
|
op = _peek();
|
|
_next();
|
|
break;
|
|
default:
|
|
op = TokenKind.NO_MATCH;
|
|
}
|
|
|
|
var value;
|
|
if (op != TokenKind.NO_MATCH) {
|
|
// Operator hit so we require a value too.
|
|
if (_peekIdentifier()) {
|
|
value = identifier();
|
|
} else {
|
|
value = processQuotedString(false);
|
|
}
|
|
|
|
if (value == null) {
|
|
_error('expected attribute value string or ident', _peekToken.span);
|
|
}
|
|
}
|
|
|
|
_eat(TokenKind.RBRACK);
|
|
|
|
return new AttributeSelector(attrName, op, value, _makeSpan(start));
|
|
}
|
|
}
|
|
|
|
// Declaration grammar:
|
|
//
|
|
// declaration: property ':' expr prio?
|
|
//
|
|
// property: IDENT [or IE hacks]
|
|
// prio: !important
|
|
// expr: (see processExpr)
|
|
//
|
|
// Here are the ugly IE hacks we need to support:
|
|
// property: expr prio? \9; - IE8 and below property, /9 before semi-colon
|
|
// *IDENT - IE7 or below
|
|
// _IDENT - IE6 property (automatically a valid ident)
|
|
//
|
|
Declaration processDeclaration(List dartStyles) {
|
|
Declaration decl;
|
|
|
|
int start = _peekToken.start;
|
|
|
|
// IE7 hack of * before property name if so the property is IE7 or below.
|
|
var ie7 = _peekKind(TokenKind.ASTERISK);
|
|
if (ie7) {
|
|
_next();
|
|
}
|
|
|
|
// IDENT ':' expr '!important'?
|
|
if (TokenKind.isIdentifier(_peekToken.kind)) {
|
|
var propertyIdent = identifier();
|
|
|
|
var ieFilterProperty = propertyIdent.name.toLowerCase() == 'filter';
|
|
|
|
_eat(TokenKind.COLON);
|
|
|
|
Expressions exprs = processExpr(ieFilterProperty);
|
|
|
|
var dartComposite = _styleForDart(propertyIdent, exprs, dartStyles);
|
|
|
|
// Handle !important (prio)
|
|
var importantPriority = _maybeEat(TokenKind.IMPORTANT);
|
|
|
|
decl = new Declaration(propertyIdent, exprs, dartComposite,
|
|
_makeSpan(start), important: importantPriority, ie7: ie7);
|
|
} else if (_peekToken.kind == TokenKind.VAR_DEFINITION) {
|
|
_next();
|
|
var definedName;
|
|
if (_peekIdentifier()) definedName = identifier();
|
|
|
|
_eat(TokenKind.COLON);
|
|
|
|
Expressions exprs = processExpr();
|
|
|
|
decl = new VarDefinition(definedName, exprs, _makeSpan(start));
|
|
} else if (_peekToken.kind == TokenKind.DIRECTIVE_INCLUDE) {
|
|
// @include mixinName in the declaration area.
|
|
var span = _makeSpan(start);
|
|
var include = processInclude(span, eatSemiColon: false);
|
|
decl = new IncludeMixinAtDeclaration(include, span);
|
|
} else if (_peekToken.kind == TokenKind.DIRECTIVE_EXTEND) {
|
|
var simpleSequences = <TreeNode>[];
|
|
|
|
_next();
|
|
var span = _makeSpan(start);
|
|
var selector = simpleSelector();
|
|
if (selector == null) {
|
|
_warning("@extends expecting simple selector name", span);
|
|
} else {
|
|
simpleSequences.add(selector);
|
|
}
|
|
if (_peekKind(TokenKind.COLON)) {
|
|
var pseudoSelector = processPseudoSelector(_peekToken.start);
|
|
if (pseudoSelector is PseudoElementSelector ||
|
|
pseudoSelector is PseudoClassSelector) {
|
|
simpleSequences.add(pseudoSelector);
|
|
} else {
|
|
_warning("not a valid selector", span);
|
|
}
|
|
}
|
|
decl = new ExtendDeclaration(simpleSequences, span);
|
|
}
|
|
|
|
return decl;
|
|
}
|
|
|
|
/** List of styles exposed to the Dart UI framework. */
|
|
static const int _fontPartFont= 0;
|
|
static const int _fontPartVariant = 1;
|
|
static const int _fontPartWeight = 2;
|
|
static const int _fontPartSize = 3;
|
|
static const int _fontPartFamily = 4;
|
|
static const int _fontPartStyle = 5;
|
|
static const int _marginPartMargin = 6;
|
|
static const int _marginPartLeft = 7;
|
|
static const int _marginPartTop = 8;
|
|
static const int _marginPartRight = 9;
|
|
static const int _marginPartBottom = 10;
|
|
static const int _lineHeightPart = 11;
|
|
static const int _borderPartBorder = 12;
|
|
static const int _borderPartLeft = 13;
|
|
static const int _borderPartTop = 14;
|
|
static const int _borderPartRight = 15;
|
|
static const int _borderPartBottom = 16;
|
|
static const int _borderPartWidth = 17;
|
|
static const int _borderPartLeftWidth = 18;
|
|
static const int _borderPartTopWidth = 19;
|
|
static const int _borderPartRightWidth = 20;
|
|
static const int _borderPartBottomWidth = 21;
|
|
static const int _heightPart = 22;
|
|
static const int _widthPart = 23;
|
|
static const int _paddingPartPadding = 24;
|
|
static const int _paddingPartLeft = 25;
|
|
static const int _paddingPartTop = 26;
|
|
static const int _paddingPartRight = 27;
|
|
static const int _paddingPartBottom = 28;
|
|
|
|
static const Map<String, int> _stylesToDart = const {
|
|
'font': _fontPartFont,
|
|
'font-family': _fontPartFamily,
|
|
'font-size': _fontPartSize,
|
|
'font-style': _fontPartStyle,
|
|
'font-variant': _fontPartVariant,
|
|
'font-weight': _fontPartWeight,
|
|
'line-height': _lineHeightPart,
|
|
'margin': _marginPartMargin,
|
|
'margin-left': _marginPartLeft,
|
|
'margin-right': _marginPartRight,
|
|
'margin-top': _marginPartTop,
|
|
'margin-bottom': _marginPartBottom,
|
|
'border': _borderPartBorder,
|
|
'border-left': _borderPartLeft,
|
|
'border-right': _borderPartRight,
|
|
'border-top': _borderPartTop,
|
|
'border-bottom': _borderPartBottom,
|
|
'border-width': _borderPartWidth,
|
|
'border-left-width': _borderPartLeftWidth,
|
|
'border-top-width': _borderPartTopWidth,
|
|
'border-right-width': _borderPartRightWidth,
|
|
'border-bottom-width': _borderPartBottomWidth,
|
|
'height': _heightPart,
|
|
'width': _widthPart,
|
|
'padding': _paddingPartPadding,
|
|
'padding-left': _paddingPartLeft,
|
|
'padding-top': _paddingPartTop,
|
|
'padding-right': _paddingPartRight,
|
|
'padding-bottom': _paddingPartBottom
|
|
};
|
|
|
|
static const Map<String, int> _nameToFontWeight = const {
|
|
'bold' : FontWeight.bold,
|
|
'normal' : FontWeight.normal
|
|
};
|
|
|
|
static int _findStyle(String styleName) => _stylesToDart[styleName];
|
|
|
|
DartStyleExpression _styleForDart(Identifier property, Expressions exprs,
|
|
List dartStyles) {
|
|
var styleType = _findStyle(property.name.toLowerCase());
|
|
if (styleType != null) {
|
|
return buildDartStyleNode(styleType, exprs, dartStyles);
|
|
}
|
|
}
|
|
|
|
FontExpression _mergeFontStyles(FontExpression fontExpr, List dartStyles) {
|
|
// Merge all font styles for this class selector.
|
|
for (var dartStyle in dartStyles) {
|
|
if (dartStyle.isFont) {
|
|
fontExpr = new FontExpression.merge(dartStyle, fontExpr);
|
|
}
|
|
}
|
|
|
|
return fontExpr;
|
|
}
|
|
|
|
DartStyleExpression buildDartStyleNode(int styleType, Expressions exprs,
|
|
List dartStyles) {
|
|
|
|
switch (styleType) {
|
|
/*
|
|
* Properties in order:
|
|
*
|
|
* font-style font-variant font-weight font-size/line-height font-family
|
|
*
|
|
* The font-size and font-family values are required. If other values are
|
|
* missing; a default, if it exist, will be used.
|
|
*/
|
|
case _fontPartFont:
|
|
var processor = new ExpressionsProcessor(exprs);
|
|
return _mergeFontStyles(processor.processFont(), dartStyles);
|
|
case _fontPartFamily:
|
|
var processor = new ExpressionsProcessor(exprs);
|
|
|
|
try {
|
|
return _mergeFontStyles(processor.processFontFamily(), dartStyles);
|
|
} catch (fontException) {
|
|
_error(fontException, _peekToken.span);
|
|
}
|
|
break;
|
|
case _fontPartSize:
|
|
var processor = new ExpressionsProcessor(exprs);
|
|
return _mergeFontStyles(processor.processFontSize(), dartStyles);
|
|
case _fontPartStyle:
|
|
/* Possible style values:
|
|
* normal [default]
|
|
* italic
|
|
* oblique
|
|
* inherit
|
|
*/
|
|
// TODO(terry): TBD
|
|
break;
|
|
case _fontPartVariant:
|
|
/* Possible variant values:
|
|
* normal [default]
|
|
* small-caps
|
|
* inherit
|
|
*/
|
|
// TODO(terry): TBD
|
|
break;
|
|
case _fontPartWeight:
|
|
/* Possible weight values:
|
|
* normal [default]
|
|
* bold
|
|
* bolder
|
|
* lighter
|
|
* 100 - 900
|
|
* inherit
|
|
*/
|
|
// TODO(terry): Only 'normal', 'bold', or values of 100-900 supoorted
|
|
// need to handle bolder, lighter, and inherit. See
|
|
// https://github.com/dart-lang/csslib/issues/1
|
|
var expr = exprs.expressions[0];
|
|
if (expr is NumberTerm) {
|
|
var fontExpr = new FontExpression(expr.span,
|
|
weight: expr.value);
|
|
return _mergeFontStyles(fontExpr, dartStyles);
|
|
} else if (expr is LiteralTerm) {
|
|
int weight = _nameToFontWeight[expr.value.toString()];
|
|
if (weight != null) {
|
|
var fontExpr = new FontExpression(expr.span, weight: weight);
|
|
return _mergeFontStyles(fontExpr, dartStyles);
|
|
}
|
|
}
|
|
break;
|
|
case _lineHeightPart:
|
|
num lineHeight;
|
|
if (exprs.expressions.length == 1) {
|
|
var expr = exprs.expressions[0];
|
|
if (expr is UnitTerm) {
|
|
UnitTerm unitTerm = expr;
|
|
// TODO(terry): Need to handle other units and LiteralTerm normal
|
|
// See https://github.com/dart-lang/csslib/issues/2.
|
|
if (unitTerm.unit == TokenKind.UNIT_LENGTH_PX ||
|
|
unitTerm.unit == TokenKind.UNIT_LENGTH_PT) {
|
|
var fontExpr = new FontExpression(expr.span,
|
|
lineHeight: new LineHeight(expr.value, inPixels: true));
|
|
return _mergeFontStyles(fontExpr, dartStyles);
|
|
} else if (isChecked) {
|
|
_warning("Unexpected unit for line-height", expr.span);
|
|
}
|
|
} else if (expr is NumberTerm) {
|
|
var fontExpr = new FontExpression(expr.span,
|
|
lineHeight: new LineHeight(expr.value, inPixels: false));
|
|
return _mergeFontStyles(fontExpr, dartStyles);
|
|
} else if (isChecked) {
|
|
_warning("Unexpected value for line-height", expr.span);
|
|
}
|
|
}
|
|
break;
|
|
case _marginPartMargin:
|
|
return new MarginExpression.boxEdge(exprs.span, processFourNums(exprs));
|
|
case _borderPartBorder:
|
|
for (var expr in exprs.expressions) {
|
|
var v = marginValue(expr);
|
|
if (v != null) {
|
|
final box = new BoxEdge.uniform(v);
|
|
return new BorderExpression.boxEdge(exprs.span, box);
|
|
}
|
|
}
|
|
break;
|
|
case _borderPartWidth:
|
|
var v = marginValue(exprs.expressions[0]);
|
|
if (v != null) {
|
|
final box = new BoxEdge.uniform(v);
|
|
return new BorderExpression.boxEdge(exprs.span, box);
|
|
}
|
|
break;
|
|
case _paddingPartPadding:
|
|
return new PaddingExpression.boxEdge(exprs.span,
|
|
processFourNums(exprs));
|
|
case _marginPartLeft:
|
|
case _marginPartTop:
|
|
case _marginPartRight:
|
|
case _marginPartBottom:
|
|
case _borderPartLeft:
|
|
case _borderPartTop:
|
|
case _borderPartRight:
|
|
case _borderPartBottom:
|
|
case _borderPartLeftWidth:
|
|
case _borderPartTopWidth:
|
|
case _borderPartRightWidth:
|
|
case _borderPartBottomWidth:
|
|
case _heightPart:
|
|
case _widthPart:
|
|
case _paddingPartLeft:
|
|
case _paddingPartTop:
|
|
case _paddingPartRight:
|
|
case _paddingPartBottom:
|
|
if (exprs.expressions.length > 0) {
|
|
return processOneNumber(exprs, styleType);
|
|
}
|
|
break;
|
|
default:
|
|
// Don't handle it.
|
|
return null;
|
|
}
|
|
}
|
|
|
|
// TODO(terry): Look at handling width of thin, thick, etc. any none numbers
|
|
// to convert to a number.
|
|
DartStyleExpression processOneNumber(Expressions exprs, int part) {
|
|
var value = marginValue(exprs.expressions[0]);
|
|
if (value != null) {
|
|
switch (part) {
|
|
case _marginPartLeft:
|
|
return new MarginExpression(exprs.span, left: value);
|
|
case _marginPartTop:
|
|
return new MarginExpression(exprs.span, top: value);
|
|
case _marginPartRight:
|
|
return new MarginExpression(exprs.span, right: value);
|
|
case _marginPartBottom:
|
|
return new MarginExpression(exprs.span, bottom: value);
|
|
case _borderPartLeft:
|
|
case _borderPartLeftWidth:
|
|
return new BorderExpression(exprs.span, left: value);
|
|
case _borderPartTop:
|
|
case _borderPartTopWidth:
|
|
return new BorderExpression(exprs.span, top: value);
|
|
case _borderPartRight:
|
|
case _borderPartRightWidth:
|
|
return new BorderExpression(exprs.span, right: value);
|
|
case _borderPartBottom:
|
|
case _borderPartBottomWidth:
|
|
return new BorderExpression(exprs.span, bottom: value);
|
|
case _heightPart:
|
|
return new HeightExpression(exprs.span, value);
|
|
case _widthPart:
|
|
return new WidthExpression(exprs.span, value);
|
|
case _paddingPartLeft:
|
|
return new PaddingExpression(exprs.span, left: value);
|
|
case _paddingPartTop:
|
|
return new PaddingExpression(exprs.span, top: value);
|
|
case _paddingPartRight:
|
|
return new PaddingExpression(exprs.span, right: value);
|
|
case _paddingPartBottom:
|
|
return new PaddingExpression(exprs.span, bottom: value);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Margins are of the format:
|
|
*
|
|
* top,right,bottom,left (4 parameters)
|
|
* top,right/left, bottom (3 parameters)
|
|
* top/bottom,right/left (2 parameters)
|
|
* top/right/bottom/left (1 parameter)
|
|
*
|
|
* The values of the margins can be a unit or unitless or auto.
|
|
*/
|
|
BoxEdge processFourNums(Expressions exprs) {
|
|
num top;
|
|
num right;
|
|
num bottom;
|
|
num left;
|
|
|
|
int totalExprs = exprs.expressions.length;
|
|
switch (totalExprs) {
|
|
case 1:
|
|
top = marginValue(exprs.expressions[0]);
|
|
right = top;
|
|
bottom = top;
|
|
left = top;
|
|
break;
|
|
case 2:
|
|
top = marginValue(exprs.expressions[0]);
|
|
bottom = top;
|
|
right = marginValue(exprs.expressions[1]);
|
|
left = right;
|
|
break;
|
|
case 3:
|
|
top = marginValue(exprs.expressions[0]);
|
|
right = marginValue(exprs.expressions[1]);
|
|
left = right;
|
|
bottom = marginValue(exprs.expressions[2]);
|
|
break;
|
|
case 4:
|
|
top = marginValue(exprs.expressions[0]);
|
|
right = marginValue(exprs.expressions[1]);
|
|
bottom = marginValue(exprs.expressions[2]);
|
|
left = marginValue(exprs.expressions[3]);
|
|
break;
|
|
default:
|
|
return null;
|
|
}
|
|
|
|
return new BoxEdge.clockwiseFromTop(top, right, bottom, left);
|
|
}
|
|
|
|
// TODO(terry): Need to handle auto.
|
|
marginValue(var exprTerm) {
|
|
if (exprTerm is UnitTerm || exprTerm is NumberTerm) {
|
|
return exprTerm.value;
|
|
}
|
|
}
|
|
|
|
// Expression grammar:
|
|
//
|
|
// expression: term [ operator? term]*
|
|
//
|
|
// operator: '/' | ','
|
|
// term: (see processTerm)
|
|
//
|
|
Expressions processExpr([bool ieFilter = false]) {
|
|
var start = _peekToken.start;
|
|
var expressions = new Expressions(_makeSpan(start));
|
|
|
|
var keepGoing = true;
|
|
var expr;
|
|
while (keepGoing && (expr = processTerm(ieFilter)) != null) {
|
|
var op;
|
|
|
|
var opStart = _peekToken.start;
|
|
|
|
switch (_peek()) {
|
|
case TokenKind.SLASH:
|
|
op = new OperatorSlash(_makeSpan(opStart));
|
|
break;
|
|
case TokenKind.COMMA:
|
|
op = new OperatorComma(_makeSpan(opStart));
|
|
break;
|
|
case TokenKind.BACKSLASH:
|
|
// Backslash outside of string; detected IE8 or older signaled by \9 at
|
|
// end of an expression.
|
|
var ie8Start = _peekToken.start;
|
|
|
|
_next();
|
|
if (_peekKind(TokenKind.INTEGER)) {
|
|
var numToken = _next();
|
|
var value = int.parse(numToken.text);
|
|
if (value == 9) {
|
|
op = new IE8Term(_makeSpan(ie8Start));
|
|
} else if (isChecked) {
|
|
_warning("\$value is not valid in an expression", _makeSpan(start));
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (expr != null) {
|
|
if (expr is List) {
|
|
expr.forEach((exprItem) {
|
|
expressions.add(exprItem);
|
|
});
|
|
} else {
|
|
expressions.add(expr);
|
|
}
|
|
} else {
|
|
keepGoing = false;
|
|
}
|
|
|
|
if (op != null) {
|
|
expressions.add(op);
|
|
if (op is IE8Term) {
|
|
keepGoing = false;
|
|
} else {
|
|
_next();
|
|
}
|
|
}
|
|
}
|
|
|
|
return expressions;
|
|
}
|
|
|
|
static final int MAX_UNICODE = int.parse('0x10FFFF');
|
|
|
|
// Term grammar:
|
|
//
|
|
// term:
|
|
// unary_operator?
|
|
// [ term_value ]
|
|
// | STRING S* | IDENT S* | URI S* | UNICODERANGE S* | hexcolor
|
|
//
|
|
// term_value:
|
|
// NUMBER S* | PERCENTAGE S* | LENGTH S* | EMS S* | EXS S* | ANGLE S* |
|
|
// TIME S* | FREQ S* | function
|
|
//
|
|
// NUMBER: {num}
|
|
// PERCENTAGE: {num}%
|
|
// LENGTH: {num}['px' | 'cm' | 'mm' | 'in' | 'pt' | 'pc']
|
|
// EMS: {num}'em'
|
|
// EXS: {num}'ex'
|
|
// ANGLE: {num}['deg' | 'rad' | 'grad']
|
|
// TIME: {num}['ms' | 's']
|
|
// FREQ: {num}['hz' | 'khz']
|
|
// function: IDENT '(' expr ')'
|
|
//
|
|
processTerm([bool ieFilter = false]) {
|
|
var start = _peekToken.start;
|
|
Token t; // token for term's value
|
|
var value; // value of term (numeric values)
|
|
|
|
var unary = "";
|
|
switch (_peek()) {
|
|
case TokenKind.HASH:
|
|
this._eat(TokenKind.HASH);
|
|
if (!_anyWhiteSpaceBeforePeekToken(TokenKind.HASH)) {
|
|
String hexText;
|
|
if (_peekKind(TokenKind.INTEGER)) {
|
|
String hexText1 = _peekToken.text;
|
|
_next();
|
|
if (_peekIdentifier()) {
|
|
hexText = '$hexText1${identifier().name}';
|
|
} else {
|
|
hexText = hexText1;
|
|
}
|
|
} else if (_peekIdentifier()) {
|
|
hexText = identifier().name;
|
|
}
|
|
if (hexText != null) {
|
|
return _parseHex(hexText, _makeSpan(start));
|
|
}
|
|
}
|
|
|
|
if (isChecked) {
|
|
_warning("Expected hex number", _makeSpan(start));
|
|
}
|
|
// Construct the bad hex value with a #<space>number.
|
|
return _parseHex(" ${processTerm().text}", _makeSpan(start));
|
|
case TokenKind.INTEGER:
|
|
t = _next();
|
|
value = int.parse("${unary}${t.text}");
|
|
break;
|
|
case TokenKind.DOUBLE:
|
|
t = _next();
|
|
value = double.parse("${unary}${t.text}");
|
|
break;
|
|
case TokenKind.SINGLE_QUOTE:
|
|
value = processQuotedString(false);
|
|
value = "'${_escapeString(value, single: true)}'";
|
|
return new LiteralTerm(value, value, _makeSpan(start));
|
|
case TokenKind.DOUBLE_QUOTE:
|
|
value = processQuotedString(false);
|
|
value = '"${_escapeString(value)}"';
|
|
return new LiteralTerm(value, value, _makeSpan(start));
|
|
case TokenKind.LPAREN:
|
|
_next();
|
|
|
|
GroupTerm group = new GroupTerm(_makeSpan(start));
|
|
|
|
var term;
|
|
do {
|
|
term = processTerm();
|
|
if (term != null && term is LiteralTerm) {
|
|
group.add(term);
|
|
}
|
|
} while (term != null && !_maybeEat(TokenKind.RPAREN) &&
|
|
!isPrematureEndOfFile());
|
|
|
|
return group;
|
|
case TokenKind.LBRACK:
|
|
_next();
|
|
|
|
var term = processTerm();
|
|
if (!(term is NumberTerm)) {
|
|
_error('Expecting a positive number', _makeSpan(start));
|
|
}
|
|
|
|
_eat(TokenKind.RBRACK);
|
|
|
|
return new ItemTerm(term.value, term.text, _makeSpan(start));
|
|
case TokenKind.IDENTIFIER:
|
|
var nameValue = identifier(); // Snarf up the ident we'll remap, maybe.
|
|
|
|
if (!ieFilter && _maybeEat(TokenKind.LPAREN)) {
|
|
// FUNCTION
|
|
return processFunction(nameValue);
|
|
} if (ieFilter) {
|
|
if (_maybeEat(TokenKind.COLON) &&
|
|
nameValue.name.toLowerCase() == 'progid') {
|
|
// IE filter:progid:
|
|
return processIEFilter(start);
|
|
} else {
|
|
// Handle filter:<name> where name is any filter e.g., alpha, chroma,
|
|
// Wave, blur, etc.
|
|
return processIEFilter(start);
|
|
}
|
|
}
|
|
|
|
// TODO(terry): Need to have a list of known identifiers today only
|
|
// 'from' is special.
|
|
if (nameValue.name == 'from') {
|
|
return new LiteralTerm(nameValue, nameValue.name, _makeSpan(start));
|
|
}
|
|
|
|
// What kind of identifier is it, named color?
|
|
var colorEntry = TokenKind.matchColorName(nameValue.name);
|
|
if (colorEntry == null) {
|
|
if (isChecked) {
|
|
var propName = nameValue.name;
|
|
var errMsg = TokenKind.isPredefinedName(propName) ?
|
|
"Improper use of property value ${propName}" :
|
|
"Unknown property value ${propName}";
|
|
_warning(errMsg, _makeSpan(start));
|
|
}
|
|
return new LiteralTerm(nameValue, nameValue.name, _makeSpan(start));
|
|
}
|
|
|
|
// Yes, process the color as an RGB value.
|
|
var rgbColor =
|
|
TokenKind.decimalToHex(TokenKind.colorValue(colorEntry), 6);
|
|
return _parseHex(rgbColor, _makeSpan(start));
|
|
case TokenKind.UNICODE_RANGE:
|
|
var first;
|
|
var second;
|
|
var firstNumber;
|
|
var secondNumber;
|
|
_eat(TokenKind.UNICODE_RANGE, unicodeRange: true);
|
|
if (_maybeEat(TokenKind.HEX_INTEGER, unicodeRange: true)) {
|
|
first = _previousToken.text;
|
|
firstNumber = int.parse('0x$first');
|
|
if (firstNumber > MAX_UNICODE) {
|
|
_error("unicode range must be less than 10FFFF", _makeSpan(start));
|
|
}
|
|
if (_maybeEat(TokenKind.MINUS, unicodeRange: true)) {
|
|
if (_maybeEat(TokenKind.HEX_INTEGER, unicodeRange: true)) {
|
|
second = _previousToken.text;
|
|
secondNumber = int.parse('0x$second');
|
|
if (secondNumber > MAX_UNICODE) {
|
|
_error("unicode range must be less than 10FFFF",
|
|
_makeSpan(start));
|
|
}
|
|
if (firstNumber > secondNumber) {
|
|
_error("unicode first range can not be greater than last",
|
|
_makeSpan(start));
|
|
}
|
|
}
|
|
}
|
|
} else if (_maybeEat(TokenKind.HEX_RANGE, unicodeRange: true)) {
|
|
first = _previousToken.text;
|
|
}
|
|
|
|
return new UnicodeRangeTerm(first, second, _makeSpan(start));
|
|
case TokenKind.AT:
|
|
if (messages.options.lessSupport) {
|
|
_next();
|
|
|
|
var expr = processExpr();
|
|
if (isChecked && expr.expressions.length > 1) {
|
|
_error("only @name for Less syntax", _peekToken.span);
|
|
}
|
|
|
|
var param = expr.expressions[0];
|
|
var varUsage = new VarUsage(param.text, [], _makeSpan(start));
|
|
expr.expressions[0] = varUsage;
|
|
return expr.expressions;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return processDimension(t, value, _makeSpan(start));
|
|
}
|
|
|
|
/** Process all dimension units. */
|
|
LiteralTerm processDimension(Token t, var value, Span span) {
|
|
LiteralTerm term;
|
|
var unitType = this._peek();
|
|
|
|
switch (unitType) {
|
|
case TokenKind.UNIT_EM:
|
|
term = new EmTerm(value, t.text, span);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_EX:
|
|
term = new ExTerm(value, t.text, span);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_LENGTH_PX:
|
|
case TokenKind.UNIT_LENGTH_CM:
|
|
case TokenKind.UNIT_LENGTH_MM:
|
|
case TokenKind.UNIT_LENGTH_IN:
|
|
case TokenKind.UNIT_LENGTH_PT:
|
|
case TokenKind.UNIT_LENGTH_PC:
|
|
term = new LengthTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_ANGLE_DEG:
|
|
case TokenKind.UNIT_ANGLE_RAD:
|
|
case TokenKind.UNIT_ANGLE_GRAD:
|
|
case TokenKind.UNIT_ANGLE_TURN:
|
|
term = new AngleTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_TIME_MS:
|
|
case TokenKind.UNIT_TIME_S:
|
|
term = new TimeTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_FREQ_HZ:
|
|
case TokenKind.UNIT_FREQ_KHZ:
|
|
term = new FreqTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.PERCENT:
|
|
term = new PercentageTerm(value, t.text, span);
|
|
_next(); // Skip the %
|
|
break;
|
|
case TokenKind.UNIT_FRACTION:
|
|
term = new FractionTerm(value, t.text, span);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_RESOLUTION_DPI:
|
|
case TokenKind.UNIT_RESOLUTION_DPCM:
|
|
case TokenKind.UNIT_RESOLUTION_DPPX:
|
|
term = new ResolutionTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_CH:
|
|
term = new ChTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_REM:
|
|
term = new RemTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
case TokenKind.UNIT_VIEWPORT_VW:
|
|
case TokenKind.UNIT_VIEWPORT_VH:
|
|
case TokenKind.UNIT_VIEWPORT_VMIN:
|
|
case TokenKind.UNIT_VIEWPORT_VMAX:
|
|
term = new ViewportTerm(value, t.text, span, unitType);
|
|
_next(); // Skip the unit
|
|
break;
|
|
default:
|
|
if (value != null && t != null) {
|
|
term = (value is Identifier)
|
|
? new LiteralTerm(value, value.name, span)
|
|
: new NumberTerm(value, t.text, span);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return term;
|
|
}
|
|
|
|
String processQuotedString([bool urlString = false]) {
|
|
var start = _peekToken.start;
|
|
|
|
// URI term sucks up everything inside of quotes(' or ") or between parens
|
|
var stopToken = urlString ? TokenKind.RPAREN : -1;
|
|
switch (_peek()) {
|
|
case TokenKind.SINGLE_QUOTE:
|
|
stopToken = TokenKind.SINGLE_QUOTE;
|
|
start = _peekToken.start + 1; // Skip the quote might have whitespace.
|
|
_next(); // Skip the SINGLE_QUOTE.
|
|
break;
|
|
case TokenKind.DOUBLE_QUOTE:
|
|
stopToken = TokenKind.DOUBLE_QUOTE;
|
|
start = _peekToken.start + 1; // Skip the quote might have whitespace.
|
|
_next(); // Skip the DOUBLE_QUOTE.
|
|
break;
|
|
default:
|
|
if (urlString) {
|
|
if (_peek() == TokenKind.LPAREN) {
|
|
_next(); // Skip the LPAREN.
|
|
start = _peekToken.start;
|
|
}
|
|
stopToken = TokenKind.RPAREN;
|
|
} else {
|
|
_error('unexpected string', _makeSpan(start));
|
|
}
|
|
break;
|
|
}
|
|
|
|
// Gobble up everything until we hit our stop token.
|
|
var runningStart = _peekToken.start;
|
|
while (_peek() != stopToken && _peek() != TokenKind.END_OF_FILE) {
|
|
var tok = _next();
|
|
}
|
|
|
|
// All characters between quotes is the string.
|
|
var end = _peekToken.end;
|
|
var stringValue = (_peekToken.span as FileSpan).file.getText(start,
|
|
end - 1);
|
|
|
|
if (stopToken != TokenKind.RPAREN) {
|
|
_next(); // Skip the SINGLE_QUOTE or DOUBLE_QUOTE;
|
|
}
|
|
|
|
return stringValue;
|
|
}
|
|
|
|
// TODO(terry): Should probably understand IE's non-standard filter syntax to
|
|
// fully support calc, var(), etc.
|
|
/**
|
|
* IE's filter property breaks CSS value parsing. IE's format can be:
|
|
*
|
|
* filter: progid:DXImageTransform.MS.gradient(Type=0, Color='#9d8b83');
|
|
*
|
|
* We'll just parse everything after the 'progid:' look for the left paren
|
|
* then parse to the right paren ignoring everything in between.
|
|
*/
|
|
processIEFilter(int startAfterProgidColon) {
|
|
var parens = 0;
|
|
|
|
while (_peek() != TokenKind.END_OF_FILE) {
|
|
switch (_peek()) {
|
|
case TokenKind.LPAREN:
|
|
_eat(TokenKind.LPAREN);
|
|
parens++;
|
|
break;
|
|
case TokenKind.RPAREN:
|
|
_eat(TokenKind.RPAREN);
|
|
if (--parens == 0) {
|
|
var tok = tokenizer.makeIEFilter(startAfterProgidColon,
|
|
_peekToken.start);
|
|
return new LiteralTerm(tok.text, tok.text, tok.span);
|
|
}
|
|
break;
|
|
default:
|
|
_eat(_peek());
|
|
}
|
|
}
|
|
}
|
|
|
|
// Function grammar:
|
|
//
|
|
// function: IDENT '(' expr ')'
|
|
//
|
|
processFunction(Identifier func) {
|
|
var start = _peekToken.start;
|
|
|
|
var name = func.name;
|
|
|
|
switch (name) {
|
|
case 'url':
|
|
// URI term sucks up everything inside of quotes(' or ") or between parens
|
|
var urlParam = processQuotedString(true);
|
|
|
|
// TODO(terry): Better error messge and checking for mismatched quotes.
|
|
if (_peek() == TokenKind.END_OF_FILE) {
|
|
_error("problem parsing URI", _peekToken.span);
|
|
}
|
|
|
|
if (_peek() == TokenKind.RPAREN) {
|
|
_next();
|
|
}
|
|
|
|
return new UriTerm(urlParam, _makeSpan(start));
|
|
case 'calc':
|
|
// TODO(terry): Implement expression handling...
|
|
break;
|
|
case 'var':
|
|
// TODO(terry): Consider handling var in IE specific filter/progid. This
|
|
// will require parsing entire IE specific syntax e.g.,
|
|
// param = value or progid:com_id, etc. for example:
|
|
//
|
|
// var-blur: Blur(Add = 0, Direction = 225, Strength = 10);
|
|
// var-gradient: progid:DXImageTransform.Microsoft.gradient"
|
|
// (GradientType=0,StartColorStr='#9d8b83', EndColorStr='#847670');
|
|
var expr = processExpr();
|
|
if (!_maybeEat(TokenKind.RPAREN)) {
|
|
_error("problem parsing var expected ), ", _peekToken.span);
|
|
}
|
|
if (isChecked &&
|
|
expr.expressions.where((e) => e is OperatorComma).length > 1) {
|
|
_error("too many parameters to var()", _peekToken.span);
|
|
}
|
|
|
|
var paramName = expr.expressions[0].text;
|
|
|
|
// [0] - var name, [1] - OperatorComma, [2] - default value.
|
|
var defaultValues = expr.expressions.length >= 3
|
|
? expr.expressions.sublist(2) : [];
|
|
return new VarUsage(paramName, defaultValues, _makeSpan(start));
|
|
default:
|
|
var expr = processExpr();
|
|
if (!_maybeEat(TokenKind.RPAREN)) {
|
|
_error("problem parsing function expected ), ", _peekToken.span);
|
|
}
|
|
|
|
return new FunctionTerm(name, name, expr, _makeSpan(start));
|
|
}
|
|
|
|
return null;
|
|
}
|
|
|
|
Identifier identifier() {
|
|
var tok = _next();
|
|
|
|
if (!TokenKind.isIdentifier(tok.kind) &&
|
|
!TokenKind.isKindIdentifier(tok.kind)) {
|
|
if (isChecked) {
|
|
_warning('expected identifier, but found $tok', tok.span);
|
|
}
|
|
return new Identifier("", _makeSpan(tok.start));
|
|
}
|
|
|
|
return new Identifier(tok.text, _makeSpan(tok.start));
|
|
}
|
|
|
|
// TODO(terry): Move this to base <= 36 and into shared code.
|
|
static int _hexDigit(int c) {
|
|
if (c >= 48/*0*/ && c <= 57/*9*/) {
|
|
return c - 48;
|
|
} else if (c >= 97/*a*/ && c <= 102/*f*/) {
|
|
return c - 87;
|
|
} else if (c >= 65/*A*/ && c <= 70/*F*/) {
|
|
return c - 55;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
HexColorTerm _parseHex(String hexText, Span span) {
|
|
var hexValue = 0;
|
|
|
|
for (var i = 0; i < hexText.length; i++) {
|
|
var digit = _hexDigit(hexText.codeUnitAt(i));
|
|
if (digit < 0) {
|
|
_warning('Bad hex number', span);
|
|
return new HexColorTerm(new BAD_HEX_VALUE(), hexText, span);
|
|
}
|
|
hexValue = (hexValue << 4) + digit;
|
|
}
|
|
|
|
// Make 3 character hex value #RRGGBB => #RGB iff:
|
|
// high/low nibble of RR is the same, high/low nibble of GG is the same and
|
|
// high/low nibble of BB is the same.
|
|
if (hexText.length == 6 &&
|
|
hexText[0] == hexText[1] &&
|
|
hexText[2] == hexText[3] &&
|
|
hexText[4] == hexText[5]) {
|
|
hexText = '${hexText[0]}${hexText[2]}${hexText[4]}';
|
|
} else if (hexText.length == 4 &&
|
|
hexText[0] == hexText[1] &&
|
|
hexText[2] == hexText[3]) {
|
|
hexText = '${hexText[0]}${hexText[2]}';
|
|
} else if (hexText.length == 2 && hexText[0] == hexText[1]) {
|
|
hexText = '${hexText[0]}';
|
|
}
|
|
return new HexColorTerm(hexValue, hexText, span);
|
|
}
|
|
}
|
|
|
|
class ExpressionsProcessor {
|
|
final Expressions _exprs;
|
|
int _index = 0;
|
|
|
|
ExpressionsProcessor(this._exprs);
|
|
|
|
// TODO(terry): Only handles ##px unit.
|
|
FontExpression processFontSize() {
|
|
/* font-size[/line-height]
|
|
*
|
|
* Possible size values:
|
|
* xx-small
|
|
* small
|
|
* medium [default]
|
|
* large
|
|
* x-large
|
|
* xx-large
|
|
* smaller
|
|
* larger
|
|
* ##length in px, pt, etc.
|
|
* ##%, percent of parent elem's font-size
|
|
* inherit
|
|
*/
|
|
LengthTerm size;
|
|
LineHeight lineHt;
|
|
var nextIsLineHeight = false;
|
|
for (; _index < _exprs.expressions.length; _index++) {
|
|
var expr = _exprs.expressions[_index];
|
|
if (size == null && expr is LengthTerm) {
|
|
// font-size part.
|
|
size = expr;
|
|
} else if (size != null) {
|
|
if (expr is OperatorSlash) {
|
|
// LineHeight could follow?
|
|
nextIsLineHeight = true;
|
|
} else if (nextIsLineHeight && expr is LengthTerm) {
|
|
assert(expr.unit == TokenKind.UNIT_LENGTH_PX);
|
|
lineHt = new LineHeight(expr.value, inPixels: true);
|
|
nextIsLineHeight = false;
|
|
_index++;
|
|
break;
|
|
} else {
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return new FontExpression(_exprs.span, size: size, lineHeight: lineHt);
|
|
}
|
|
|
|
FontExpression processFontFamily() {
|
|
var family = <String>[];
|
|
|
|
/* Possible family values:
|
|
* font-family: arial, Times new roman ,Lucida Sans Unicode,Courier;
|
|
* font-family: "Times New Roman", arial, Lucida Sans Unicode, Courier;
|
|
*/
|
|
var moreFamilies = false;
|
|
|
|
for (; _index < _exprs.expressions.length; _index++) {
|
|
Expression expr = _exprs.expressions[_index];
|
|
if (expr is LiteralTerm) {
|
|
if (family.length == 0 || moreFamilies) {
|
|
// It's font-family now.
|
|
family.add(expr.toString());
|
|
moreFamilies = false;
|
|
} else if (isChecked) {
|
|
messages.warning('Only font-family can be a list', _exprs.span);
|
|
}
|
|
} else if (expr is OperatorComma && family.length > 0) {
|
|
moreFamilies = true;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return new FontExpression(_exprs.span, family: family);
|
|
}
|
|
|
|
FontExpression processFont() {
|
|
List<String> family;
|
|
|
|
// Process all parts of the font expression.
|
|
FontExpression fontSize;
|
|
FontExpression fontFamily;
|
|
for (; _index < _exprs.expressions.length; _index++) {
|
|
var expr = _exprs.expressions[_index];
|
|
// Order is font-size font-family
|
|
if (fontSize == null) {
|
|
fontSize = processFontSize();
|
|
}
|
|
if (fontFamily == null) {
|
|
fontFamily = processFontFamily();
|
|
}
|
|
//TODO(terry): Handle font-weight, font-style, and font-variant. See
|
|
// https://github.com/dart-lang/csslib/issues/3
|
|
// https://github.com/dart-lang/csslib/issues/4
|
|
// https://github.com/dart-lang/csslib/issues/5
|
|
}
|
|
|
|
return new FontExpression(_exprs.span,
|
|
size: fontSize.font.size,
|
|
lineHeight: fontSize.font.lineHeight,
|
|
family: fontFamily.font.family);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Escapes [text] for use in a CSS string.
|
|
* [single] specifies single quote `'` vs double quote `"`.
|
|
*/
|
|
String _escapeString(String text, {bool single: false}) {
|
|
StringBuffer result = null;
|
|
|
|
for (int i = 0; i < text.length; i++) {
|
|
var code = text.codeUnitAt(i);
|
|
String replace = null;
|
|
switch (code) {
|
|
case 34/*'"'*/: if (!single) replace = r'\"'; break;
|
|
case 39/*"'"*/: if (single) replace = r"\'"; break;
|
|
}
|
|
|
|
if (replace != null && result == null) {
|
|
result = new StringBuffer(text.substring(0, i));
|
|
}
|
|
|
|
if (result != null) result.write(replace != null ? replace : text[i]);
|
|
}
|
|
|
|
return result == null ? text : result.toString();
|
|
}
|