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