var TYPE = require('../../tokenizer').TYPE;
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var IDENT = TYPE.Ident;
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var STRING = TYPE.String;
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var COLON = TYPE.Colon;
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var LEFTSQUAREBRACKET = TYPE.LeftSquareBracket;
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var RIGHTSQUAREBRACKET = TYPE.RightSquareBracket;
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var DOLLARSIGN = 0x0024; // U+0024 DOLLAR SIGN ($)
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var ASTERISK = 0x002A; // U+002A ASTERISK (*)
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var EQUALSSIGN = 0x003D; // U+003D EQUALS SIGN (=)
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var CIRCUMFLEXACCENT = 0x005E; // U+005E (^)
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var VERTICALLINE = 0x007C; // U+007C VERTICAL LINE (|)
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var TILDE = 0x007E; // U+007E TILDE (~)
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function getAttributeName() {
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if (this.scanner.eof) {
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this.error('Unexpected end of input');
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}
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var start = this.scanner.tokenStart;
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var expectIdent = false;
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var checkColon = true;
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if (this.scanner.isDelim(ASTERISK)) {
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expectIdent = true;
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checkColon = false;
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this.scanner.next();
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} else if (!this.scanner.isDelim(VERTICALLINE)) {
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this.eat(IDENT);
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}
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if (this.scanner.isDelim(VERTICALLINE)) {
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if (this.scanner.source.charCodeAt(this.scanner.tokenStart + 1) !== EQUALSSIGN) {
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this.scanner.next();
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this.eat(IDENT);
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} else if (expectIdent) {
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this.error('Identifier is expected', this.scanner.tokenEnd);
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}
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} else if (expectIdent) {
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this.error('Vertical line is expected');
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}
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if (checkColon && this.scanner.tokenType === COLON) {
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this.scanner.next();
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this.eat(IDENT);
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}
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return {
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type: 'Identifier',
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loc: this.getLocation(start, this.scanner.tokenStart),
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name: this.scanner.substrToCursor(start)
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};
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}
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function getOperator() {
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var start = this.scanner.tokenStart;
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var code = this.scanner.source.charCodeAt(start);
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if (code !== EQUALSSIGN && // =
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code !== TILDE && // ~=
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code !== CIRCUMFLEXACCENT && // ^=
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code !== DOLLARSIGN && // $=
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code !== ASTERISK && // *=
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code !== VERTICALLINE // |=
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) {
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this.error('Attribute selector (=, ~=, ^=, $=, *=, |=) is expected');
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}
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this.scanner.next();
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if (code !== EQUALSSIGN) {
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if (!this.scanner.isDelim(EQUALSSIGN)) {
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this.error('Equal sign is expected');
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}
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this.scanner.next();
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}
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return this.scanner.substrToCursor(start);
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}
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// '[' <wq-name> ']'
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// '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'
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module.exports = {
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name: 'AttributeSelector',
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structure: {
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name: 'Identifier',
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matcher: [String, null],
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value: ['String', 'Identifier', null],
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flags: [String, null]
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},
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parse: function() {
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var start = this.scanner.tokenStart;
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var name;
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var matcher = null;
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var value = null;
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var flags = null;
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this.eat(LEFTSQUAREBRACKET);
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this.scanner.skipSC();
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name = getAttributeName.call(this);
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this.scanner.skipSC();
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if (this.scanner.tokenType !== RIGHTSQUAREBRACKET) {
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// avoid case `[name i]`
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if (this.scanner.tokenType !== IDENT) {
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matcher = getOperator.call(this);
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this.scanner.skipSC();
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value = this.scanner.tokenType === STRING
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? this.String()
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: this.Identifier();
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this.scanner.skipSC();
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}
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// attribute flags
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if (this.scanner.tokenType === IDENT) {
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flags = this.scanner.getTokenValue();
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this.scanner.next();
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this.scanner.skipSC();
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}
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}
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this.eat(RIGHTSQUAREBRACKET);
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return {
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type: 'AttributeSelector',
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loc: this.getLocation(start, this.scanner.tokenStart),
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name: name,
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matcher: matcher,
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value: value,
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flags: flags
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};
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},
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generate: function(node) {
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var flagsPrefix = ' ';
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this.chunk('[');
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this.node(node.name);
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if (node.matcher !== null) {
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this.chunk(node.matcher);
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if (node.value !== null) {
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this.node(node.value);
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// space between string and flags is not required
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if (node.value.type === 'String') {
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flagsPrefix = '';
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}
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}
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}
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if (node.flags !== null) {
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this.chunk(flagsPrefix);
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this.chunk(node.flags);
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}
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this.chunk(']');
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}
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};
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