290 lines
9 KiB
JavaScript
290 lines
9 KiB
JavaScript
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var OffsetToLocation = require('../common/OffsetToLocation');
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var SyntaxError = require('../common/SyntaxError');
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var TokenStream = require('../common/TokenStream');
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var List = require('../common/List');
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var tokenize = require('../tokenizer');
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var constants = require('../tokenizer/const');
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var findWhiteSpaceStart = require('../tokenizer/utils').findWhiteSpaceStart;
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var sequence = require('./sequence');
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var noop = function() {};
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var TYPE = constants.TYPE;
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var NAME = constants.NAME;
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var WHITESPACE = TYPE.WhiteSpace;
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var IDENT = TYPE.Ident;
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var FUNCTION = TYPE.Function;
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var URL = TYPE.Url;
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var HASH = TYPE.Hash;
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var PERCENTAGE = TYPE.Percentage;
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var NUMBER = TYPE.Number;
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var NUMBERSIGN = 0x0023; // U+0023 NUMBER SIGN (#)
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var NULL = 0;
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function createParseContext(name) {
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return function() {
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return this[name]();
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};
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}
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function processConfig(config) {
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var parserConfig = {
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context: {},
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scope: {},
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atrule: {},
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pseudo: {}
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};
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if (config.parseContext) {
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for (var name in config.parseContext) {
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switch (typeof config.parseContext[name]) {
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case 'function':
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parserConfig.context[name] = config.parseContext[name];
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break;
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case 'string':
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parserConfig.context[name] = createParseContext(config.parseContext[name]);
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break;
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}
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}
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}
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if (config.scope) {
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for (var name in config.scope) {
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parserConfig.scope[name] = config.scope[name];
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}
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}
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if (config.atrule) {
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for (var name in config.atrule) {
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var atrule = config.atrule[name];
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if (atrule.parse) {
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parserConfig.atrule[name] = atrule.parse;
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}
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}
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}
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if (config.pseudo) {
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for (var name in config.pseudo) {
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var pseudo = config.pseudo[name];
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if (pseudo.parse) {
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parserConfig.pseudo[name] = pseudo.parse;
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}
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}
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}
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if (config.node) {
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for (var name in config.node) {
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parserConfig[name] = config.node[name].parse;
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}
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}
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return parserConfig;
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}
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module.exports = function createParser(config) {
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var parser = {
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scanner: new TokenStream(),
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locationMap: new OffsetToLocation(),
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filename: '<unknown>',
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needPositions: false,
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onParseError: noop,
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onParseErrorThrow: false,
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parseAtrulePrelude: true,
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parseRulePrelude: true,
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parseValue: true,
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parseCustomProperty: false,
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readSequence: sequence,
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createList: function() {
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return new List();
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},
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createSingleNodeList: function(node) {
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return new List().appendData(node);
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},
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getFirstListNode: function(list) {
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return list && list.first();
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},
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getLastListNode: function(list) {
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return list.last();
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},
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parseWithFallback: function(consumer, fallback) {
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var startToken = this.scanner.tokenIndex;
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try {
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return consumer.call(this);
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} catch (e) {
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if (this.onParseErrorThrow) {
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throw e;
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}
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var fallbackNode = fallback.call(this, startToken);
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this.onParseErrorThrow = true;
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this.onParseError(e, fallbackNode);
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this.onParseErrorThrow = false;
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return fallbackNode;
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}
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},
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lookupNonWSType: function(offset) {
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do {
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var type = this.scanner.lookupType(offset++);
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if (type !== WHITESPACE) {
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return type;
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}
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} while (type !== NULL);
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return NULL;
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},
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eat: function(tokenType) {
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if (this.scanner.tokenType !== tokenType) {
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var offset = this.scanner.tokenStart;
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var message = NAME[tokenType] + ' is expected';
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// tweak message and offset
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switch (tokenType) {
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case IDENT:
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// when identifier is expected but there is a function or url
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if (this.scanner.tokenType === FUNCTION || this.scanner.tokenType === URL) {
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offset = this.scanner.tokenEnd - 1;
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message = 'Identifier is expected but function found';
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} else {
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message = 'Identifier is expected';
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}
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break;
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case HASH:
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if (this.scanner.isDelim(NUMBERSIGN)) {
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this.scanner.next();
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offset++;
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message = 'Name is expected';
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}
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break;
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case PERCENTAGE:
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if (this.scanner.tokenType === NUMBER) {
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offset = this.scanner.tokenEnd;
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message = 'Percent sign is expected';
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}
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break;
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default:
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// when test type is part of another token show error for current position + 1
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// e.g. eat(HYPHENMINUS) will fail on "-foo", but pointing on "-" is odd
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if (this.scanner.source.charCodeAt(this.scanner.tokenStart) === tokenType) {
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offset = offset + 1;
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}
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}
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this.error(message, offset);
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}
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this.scanner.next();
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},
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consume: function(tokenType) {
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var value = this.scanner.getTokenValue();
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this.eat(tokenType);
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return value;
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},
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consumeFunctionName: function() {
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var name = this.scanner.source.substring(this.scanner.tokenStart, this.scanner.tokenEnd - 1);
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this.eat(FUNCTION);
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return name;
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},
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getLocation: function(start, end) {
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if (this.needPositions) {
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return this.locationMap.getLocationRange(
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start,
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end,
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this.filename
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);
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}
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return null;
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},
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getLocationFromList: function(list) {
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if (this.needPositions) {
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var head = this.getFirstListNode(list);
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var tail = this.getLastListNode(list);
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return this.locationMap.getLocationRange(
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head !== null ? head.loc.start.offset - this.locationMap.startOffset : this.scanner.tokenStart,
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tail !== null ? tail.loc.end.offset - this.locationMap.startOffset : this.scanner.tokenStart,
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this.filename
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);
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}
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return null;
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},
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error: function(message, offset) {
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var location = typeof offset !== 'undefined' && offset < this.scanner.source.length
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? this.locationMap.getLocation(offset)
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: this.scanner.eof
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? this.locationMap.getLocation(findWhiteSpaceStart(this.scanner.source, this.scanner.source.length - 1))
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: this.locationMap.getLocation(this.scanner.tokenStart);
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throw new SyntaxError(
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message || 'Unexpected input',
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this.scanner.source,
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location.offset,
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location.line,
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location.column
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);
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}
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};
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config = processConfig(config || {});
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for (var key in config) {
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parser[key] = config[key];
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}
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return function(source, options) {
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options = options || {};
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var context = options.context || 'default';
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var ast;
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tokenize(source, parser.scanner);
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parser.locationMap.setSource(
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source,
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options.offset,
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options.line,
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options.column
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);
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parser.filename = options.filename || '<unknown>';
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parser.needPositions = Boolean(options.positions);
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parser.onParseError = typeof options.onParseError === 'function' ? options.onParseError : noop;
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parser.onParseErrorThrow = false;
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parser.parseAtrulePrelude = 'parseAtrulePrelude' in options ? Boolean(options.parseAtrulePrelude) : true;
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parser.parseRulePrelude = 'parseRulePrelude' in options ? Boolean(options.parseRulePrelude) : true;
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parser.parseValue = 'parseValue' in options ? Boolean(options.parseValue) : true;
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parser.parseCustomProperty = 'parseCustomProperty' in options ? Boolean(options.parseCustomProperty) : false;
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if (!parser.context.hasOwnProperty(context)) {
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throw new Error('Unknown context `' + context + '`');
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}
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ast = parser.context[context].call(parser, options);
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if (!parser.scanner.eof) {
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parser.error();
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}
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return ast;
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};
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};
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