parserlib: implement @supports selector()
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@ -4020,24 +4020,19 @@ self.parserlib = (() => {
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_supportsCondition() {
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const stream = this._tokenStream;
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if (stream.match(Tokens.IDENT)) {
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const ident = lower(stream._token.value);
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if (ident === 'not') {
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const next = stream.LT(1);
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if (next.type === Tokens.IDENT && lower(next.value) === 'not') {
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stream.get();
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stream.mustMatch(Tokens.S);
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this._supportsConditionInParens();
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} else {
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stream.unget();
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}
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} else {
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this._supportsConditionInParens();
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this._ws();
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while (stream.peek() === Tokens.IDENT) {
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const ident = lower(stream.LT(1).value);
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if (ident === 'and' || ident === 'or') {
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stream.mustMatch(Tokens.IDENT);
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stream.get();
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this._ws();
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this._supportsConditionInParens();
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this._ws();
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}
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}
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}
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@ -4045,36 +4040,41 @@ self.parserlib = (() => {
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_supportsConditionInParens() {
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const stream = this._tokenStream;
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if (stream.match(Tokens.LPAREN)) {
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this._ws();
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if (stream.match([Tokens.IDENT, Tokens.CUSTOM_PROP])) {
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// look ahead for not keyword,
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// if not given, continue with declaration condition.
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const ident = lower(stream._token.value);
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if (ident === 'not') {
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const next = stream.LT(1);
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if (next.type === Tokens.LPAREN) {
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stream.get();
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this._ws();
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const {type, value} = stream.LT(1);
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if (type === Tokens.IDENT || type === Tokens.CUSTOM_PROP) {
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if (lower(value) === 'not') {
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this._supportsCondition();
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stream.mustMatch(Tokens.RPAREN);
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} else {
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stream.unget();
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this._supportsDeclarationCondition(false);
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this._supportsDecl(false);
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}
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} else {
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this._supportsCondition();
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stream.mustMatch(Tokens.RPAREN);
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}
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} else if (next.type === Tokens.FUNCTION && lower(next.value) === 'selector(') {
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stream.get();
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this._ws();
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this._selector();
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stream.mustMatch(Tokens.RPAREN);
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} else {
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this._supportsDeclarationCondition();
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this._supportsDecl();
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}
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this._ws();
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}
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_supportsDeclarationCondition(requireStartParen = true) {
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_supportsDecl(requireStartParen = true) {
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const stream = this._tokenStream;
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if (requireStartParen) {
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this._tokenStream.mustMatch(Tokens.LPAREN);
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stream.mustMatch(Tokens.LPAREN);
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}
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this._ws();
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this._declaration();
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this._tokenStream.mustMatch(Tokens.RPAREN);
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stream.mustMatch(Tokens.RPAREN);
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}
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_media() {
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