lepu-test-platform-web/node_modules/css-tree/lib/syntax/node/AttributeSelector.js

166 lines
4.5 KiB
JavaScript

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