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3401f26 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 | 'use strict';
const types = require('../tokenizer/types.cjs');
const PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)
const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
// code:
// 0xxxxxxx x0000000 - char code (0x80 for non-ASCII) or delim value
// 00000000 0xxxxxx0 - token type (0 for delim, 1 for token)
// 00000000 0000000x - reserved for carriage emit flag (0 for no space, 1 for space)
const code = (type, value) => {
if (type === types.Delim) {
type = value;
}
if (typeof type === 'string') {
type = Math.min(type.charCodeAt(0), 0x80) << 6; // replace non-ASCII with 0x80
}
return type << 1;
};
// https://www.w3.org/TR/css-syntax-3/#serialization
// The only requirement for serialization is that it must "round-trip" with parsing,
// that is, parsing the stylesheet must produce the same data structures as parsing,
// serializing, and parsing again, except for consecutive <whitespace-token>s,
// which may be collapsed into a single token.
const specPairs = [
[types.Ident, types.Ident],
[types.Ident, types.Function],
[types.Ident, types.Url],
[types.Ident, types.BadUrl],
[types.Ident, '-'],
[types.Ident, types.Number],
[types.Ident, types.Percentage],
[types.Ident, types.Dimension],
[types.Ident, types.CDC],
[types.Ident, types.LeftParenthesis],
[types.AtKeyword, types.Ident],
[types.AtKeyword, types.Function],
[types.AtKeyword, types.Url],
[types.AtKeyword, types.BadUrl],
[types.AtKeyword, '-'],
[types.AtKeyword, types.Number],
[types.AtKeyword, types.Percentage],
[types.AtKeyword, types.Dimension],
[types.AtKeyword, types.CDC],
[types.Hash, types.Ident],
[types.Hash, types.Function],
[types.Hash, types.Url],
[types.Hash, types.BadUrl],
[types.Hash, '-'],
[types.Hash, types.Number],
[types.Hash, types.Percentage],
[types.Hash, types.Dimension],
[types.Hash, types.CDC],
[types.Dimension, types.Ident],
[types.Dimension, types.Function],
[types.Dimension, types.Url],
[types.Dimension, types.BadUrl],
[types.Dimension, '-'],
[types.Dimension, types.Number],
[types.Dimension, types.Percentage],
[types.Dimension, types.Dimension],
[types.Dimension, types.CDC],
['#', types.Ident],
['#', types.Function],
['#', types.Url],
['#', types.BadUrl],
['#', '-'],
['#', types.Number],
['#', types.Percentage],
['#', types.Dimension],
['#', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
['-', types.Ident],
['-', types.Function],
['-', types.Url],
['-', types.BadUrl],
['-', '-'],
['-', types.Number],
['-', types.Percentage],
['-', types.Dimension],
['-', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
[types.Number, types.Ident],
[types.Number, types.Function],
[types.Number, types.Url],
[types.Number, types.BadUrl],
[types.Number, types.Number],
[types.Number, types.Percentage],
[types.Number, types.Dimension],
[types.Number, '%'],
[types.Number, types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
['@', types.Ident],
['@', types.Function],
['@', types.Url],
['@', types.BadUrl],
['@', '-'],
['@', types.CDC], // https://github.com/w3c/csswg-drafts/pull/6874
['.', types.Number],
['.', types.Percentage],
['.', types.Dimension],
['+', types.Number],
['+', types.Percentage],
['+', types.Dimension],
['/', '*']
];
// validate with scripts/generate-safe
const safePairs = specPairs.concat([
[types.Ident, types.Hash],
[types.Dimension, types.Hash],
[types.Hash, types.Hash],
[types.AtKeyword, types.LeftParenthesis],
[types.AtKeyword, types.String],
[types.AtKeyword, types.Colon],
[types.Percentage, types.Percentage],
[types.Percentage, types.Dimension],
[types.Percentage, types.Function],
[types.Percentage, '-'],
[types.RightParenthesis, types.Ident],
[types.RightParenthesis, types.Function],
[types.RightParenthesis, types.Percentage],
[types.RightParenthesis, types.Dimension],
[types.RightParenthesis, types.Hash],
[types.RightParenthesis, '-']
]);
function createMap(pairs) {
const isWhiteSpaceRequired = new Set(
pairs.map(([prev, next]) => (code(prev) << 16 | code(next)))
);
return function(prevCode, type, value) {
const nextCode = code(type, value);
const nextCharCode = value.charCodeAt(0);
const emitWs =
(nextCharCode === HYPHENMINUS &&
type !== types.Ident &&
type !== types.Function &&
type !== types.CDC) ||
(nextCharCode === PLUSSIGN)
? isWhiteSpaceRequired.has((prevCode & 0xFFFE) << 16 | nextCharCode << 7)
: isWhiteSpaceRequired.has((prevCode & 0xFFFE) << 16 | nextCode);
return nextCode | emitWs;
};
}
const spec = createMap(specPairs);
const safe = createMap(safePairs);
exports.safe = safe;
exports.spec = spec;
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