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173 lines
4.9 KiB
173 lines
4.9 KiB
var isHexDigit = require('../../tokenizer').isHexDigit;
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var cmpChar = require('../../tokenizer').cmpChar;
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var TYPE = require('../../tokenizer').TYPE;
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var NAME = require('../../tokenizer').NAME;
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var IDENT = TYPE.Ident;
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var NUMBER = TYPE.Number;
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var DIMENSION = TYPE.Dimension;
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var PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)
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var HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
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var QUESTIONMARK = 0x003F; // U+003F QUESTION MARK (?)
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var U = 0x0075; // U+0075 LATIN SMALL LETTER U (u)
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function eatHexSequence(offset, allowDash) {
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for (var pos = this.scanner.tokenStart + offset, len = 0; pos < this.scanner.tokenEnd; pos++) {
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var code = this.scanner.source.charCodeAt(pos);
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if (code === HYPHENMINUS && allowDash && len !== 0) {
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if (eatHexSequence.call(this, offset + len + 1, false) === 0) {
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this.error();
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}
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return -1;
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}
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if (!isHexDigit(code)) {
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this.error(
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allowDash && len !== 0
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? 'HyphenMinus' + (len < 6 ? ' or hex digit' : '') + ' is expected'
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: (len < 6 ? 'Hex digit is expected' : 'Unexpected input'),
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pos
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);
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}
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if (++len > 6) {
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this.error('Too many hex digits', pos);
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};
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}
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this.scanner.next();
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return len;
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}
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function eatQuestionMarkSequence(max) {
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var count = 0;
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while (this.scanner.isDelim(QUESTIONMARK)) {
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if (++count > max) {
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this.error('Too many question marks');
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}
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this.scanner.next();
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}
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}
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function startsWith(code) {
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if (this.scanner.source.charCodeAt(this.scanner.tokenStart) !== code) {
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this.error(NAME[code] + ' is expected');
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}
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}
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// https://drafts.csswg.org/css-syntax/#urange
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// Informally, the <urange> production has three forms:
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// U+0001
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// Defines a range consisting of a single code point, in this case the code point "1".
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// U+0001-00ff
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// Defines a range of codepoints between the first and the second value, in this case
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// the range between "1" and "ff" (255 in decimal) inclusive.
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// U+00??
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// Defines a range of codepoints where the "?" characters range over all hex digits,
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// in this case defining the same as the value U+0000-00ff.
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// In each form, a maximum of 6 digits is allowed for each hexadecimal number (if you treat "?" as a hexadecimal digit).
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//
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// <urange> =
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// u '+' <ident-token> '?'* |
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// u <dimension-token> '?'* |
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// u <number-token> '?'* |
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// u <number-token> <dimension-token> |
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// u <number-token> <number-token> |
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// u '+' '?'+
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function scanUnicodeRange() {
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var hexLength = 0;
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// u '+' <ident-token> '?'*
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// u '+' '?'+
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if (this.scanner.isDelim(PLUSSIGN)) {
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this.scanner.next();
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if (this.scanner.tokenType === IDENT) {
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hexLength = eatHexSequence.call(this, 0, true);
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if (hexLength > 0) {
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eatQuestionMarkSequence.call(this, 6 - hexLength);
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}
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return;
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}
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if (this.scanner.isDelim(QUESTIONMARK)) {
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this.scanner.next();
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eatQuestionMarkSequence.call(this, 5);
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return;
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}
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this.error('Hex digit or question mark is expected');
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return;
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}
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// u <number-token> '?'*
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// u <number-token> <dimension-token>
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// u <number-token> <number-token>
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if (this.scanner.tokenType === NUMBER) {
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startsWith.call(this, PLUSSIGN);
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hexLength = eatHexSequence.call(this, 1, true);
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if (this.scanner.isDelim(QUESTIONMARK)) {
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eatQuestionMarkSequence.call(this, 6 - hexLength);
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return;
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}
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if (this.scanner.tokenType === DIMENSION ||
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this.scanner.tokenType === NUMBER) {
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startsWith.call(this, HYPHENMINUS);
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eatHexSequence.call(this, 1, false);
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return;
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}
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return;
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}
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// u <dimension-token> '?'*
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if (this.scanner.tokenType === DIMENSION) {
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startsWith.call(this, PLUSSIGN);
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hexLength = eatHexSequence.call(this, 1, true);
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if (hexLength > 0) {
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eatQuestionMarkSequence.call(this, 6 - hexLength);
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}
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return;
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}
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this.error();
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}
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module.exports = {
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name: 'UnicodeRange',
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structure: {
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value: String
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},
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parse: function() {
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var start = this.scanner.tokenStart;
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// U or u
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if (!cmpChar(this.scanner.source, start, U)) {
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this.error('U is expected');
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}
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if (!cmpChar(this.scanner.source, start + 1, PLUSSIGN)) {
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this.error('Plus sign is expected');
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}
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this.scanner.next();
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scanUnicodeRange.call(this);
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return {
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type: 'UnicodeRange',
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loc: this.getLocation(start, this.scanner.tokenStart),
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value: this.scanner.substrToCursor(start)
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};
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},
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generate: function(node) {
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this.chunk(node.value);
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}
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};
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