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import {
Ident,
String as StringToken,
Delim,
LeftSquareBracket,
RightSquareBracket
} from '../../tokenizer/index.js';
const DOLLARSIGN = 0x0024; // U+0024 DOLLAR SIGN ($)
const ASTERISK = 0x002A; // U+002A ASTERISK (*)
const EQUALSSIGN = 0x003D; // U+003D EQUALS SIGN (=)
const CIRCUMFLEXACCENT = 0x005E; // U+005E (^)
const VERTICALLINE = 0x007C; // U+007C VERTICAL LINE (|)
const TILDE = 0x007E; // U+007E TILDE (~)
function getAttributeName() {
if (this.eof) {
this.error('Unexpected end of input');
}
const start = this.tokenStart;
let expectIdent = false;
if (this.isDelim(ASTERISK)) {
expectIdent = true;
this.next();
} else if (!this.isDelim(VERTICALLINE)) {
this.eat(Ident);
}
if (this.isDelim(VERTICALLINE)) {
if (this.charCodeAt(this.tokenStart + 1) !== EQUALSSIGN) {
this.next();
this.eat(Ident);
} else if (expectIdent) {
this.error('Identifier is expected', this.tokenEnd);
}
} else if (expectIdent) {
this.error('Vertical line is expected');
}
return {
type: 'Identifier',
loc: this.getLocation(start, this.tokenStart),
name: this.substrToCursor(start)
};
}
function getOperator() {
const start = this.tokenStart;
const code = this.charCodeAt(start);
if (code !== EQUALSSIGN && // =
code !== TILDE && // ~=
code !== CIRCUMFLEXACCENT && // ^=
code !== DOLLARSIGN && // $=
code !== ASTERISK && // *=
code !== VERTICALLINE // |=
) {
this.error('Attribute selector (=, ~=, ^=, $=, *=, |=) is expected');
}
this.next();
if (code !== EQUALSSIGN) {
if (!this.isDelim(EQUALSSIGN)) {
this.error('Equal sign is expected');
}
this.next();
}
return this.substrToCursor(start);
}
// '[' <wq-name> ']'
// '[' <wq-name> <attr-matcher> [ <string-token> | <ident-token> ] <attr-modifier>? ']'
export const name = 'AttributeSelector';
export const structure = {
name: 'Identifier',
matcher: [String, null],
value: ['String', 'Identifier', null],
flags: [String, null]
};
export function parse() {
const start = this.tokenStart;
let name;
let matcher = null;
let value = null;
let flags = null;
this.eat(LeftSquareBracket);
this.skipSC();
name = getAttributeName.call(this);
this.skipSC();
if (this.tokenType !== RightSquareBracket) {
// avoid case `[name i]`
if (this.tokenType !== Ident) {
matcher = getOperator.call(this);
this.skipSC();
value = this.tokenType === StringToken
? this.String()
: this.Identifier();
this.skipSC();
}
// attribute flags
if (this.tokenType === Ident) {
flags = this.consume(Ident);
this.skipSC();
}
}
this.eat(RightSquareBracket);
return {
type: 'AttributeSelector',
loc: this.getLocation(start, this.tokenStart),
name,
matcher,
value,
flags
};
}
export function generate(node) {
this.token(Delim, '[');
this.node(node.name);
if (node.matcher !== null) {
this.tokenize(node.matcher);
this.node(node.value);
}
if (node.flags !== null) {
this.token(Ident, node.flags);
}
this.token(Delim, ']');
}