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182
node_modules/css-tree/lib/generator/token-before.js
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182
node_modules/css-tree/lib/generator/token-before.js
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import {
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WhiteSpace,
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Delim,
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Ident,
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Function as FunctionToken,
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Url,
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BadUrl,
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AtKeyword,
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Hash,
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Percentage,
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Dimension,
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Number as NumberToken,
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String as StringToken,
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Colon,
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LeftParenthesis,
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RightParenthesis,
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CDC
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} from '../tokenizer/index.js';
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const PLUSSIGN = 0x002B; // U+002B PLUS SIGN (+)
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const HYPHENMINUS = 0x002D; // U+002D HYPHEN-MINUS (-)
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const code = (type, value) => {
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if (type === Delim) {
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type = value;
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}
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if (typeof type === 'string') {
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const charCode = type.charCodeAt(0);
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return charCode > 0x7F ? 0x8000 : charCode << 8;
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}
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return type;
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};
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// https://www.w3.org/TR/css-syntax-3/#serialization
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// The only requirement for serialization is that it must "round-trip" with parsing,
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// that is, parsing the stylesheet must produce the same data structures as parsing,
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// serializing, and parsing again, except for consecutive <whitespace-token>s,
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// which may be collapsed into a single token.
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const specPairs = [
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[Ident, Ident],
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[Ident, FunctionToken],
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[Ident, Url],
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[Ident, BadUrl],
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[Ident, '-'],
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[Ident, NumberToken],
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[Ident, Percentage],
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[Ident, Dimension],
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[Ident, CDC],
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[Ident, LeftParenthesis],
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[AtKeyword, Ident],
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[AtKeyword, FunctionToken],
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[AtKeyword, Url],
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[AtKeyword, BadUrl],
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[AtKeyword, '-'],
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[AtKeyword, NumberToken],
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[AtKeyword, Percentage],
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[AtKeyword, Dimension],
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[AtKeyword, CDC],
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[Hash, Ident],
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[Hash, FunctionToken],
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[Hash, Url],
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[Hash, BadUrl],
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[Hash, '-'],
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[Hash, NumberToken],
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[Hash, Percentage],
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[Hash, Dimension],
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[Hash, CDC],
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[Dimension, Ident],
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[Dimension, FunctionToken],
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[Dimension, Url],
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[Dimension, BadUrl],
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[Dimension, '-'],
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[Dimension, NumberToken],
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[Dimension, Percentage],
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[Dimension, Dimension],
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[Dimension, CDC],
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['#', Ident],
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['#', FunctionToken],
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['#', Url],
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['#', BadUrl],
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['#', '-'],
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['#', NumberToken],
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['#', Percentage],
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['#', Dimension],
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['#', CDC], // https://github.com/w3c/csswg-drafts/pull/6874
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['-', Ident],
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['-', FunctionToken],
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['-', Url],
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['-', BadUrl],
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['-', '-'],
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['-', NumberToken],
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['-', Percentage],
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['-', Dimension],
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['-', CDC], // https://github.com/w3c/csswg-drafts/pull/6874
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[NumberToken, Ident],
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[NumberToken, FunctionToken],
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[NumberToken, Url],
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[NumberToken, BadUrl],
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[NumberToken, NumberToken],
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[NumberToken, Percentage],
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[NumberToken, Dimension],
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[NumberToken, '%'],
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[NumberToken, CDC], // https://github.com/w3c/csswg-drafts/pull/6874
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['@', Ident],
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['@', FunctionToken],
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['@', Url],
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['@', BadUrl],
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['@', '-'],
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['@', CDC], // https://github.com/w3c/csswg-drafts/pull/6874
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['.', NumberToken],
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['.', Percentage],
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['.', Dimension],
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['+', NumberToken],
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['+', Percentage],
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['+', Dimension],
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['/', '*']
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];
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// validate with scripts/generate-safe
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const safePairs = specPairs.concat([
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[Ident, Hash],
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[Dimension, Hash],
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[Hash, Hash],
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[AtKeyword, LeftParenthesis],
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[AtKeyword, StringToken],
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[AtKeyword, Colon],
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[Percentage, Percentage],
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[Percentage, Dimension],
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[Percentage, FunctionToken],
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[Percentage, '-'],
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[RightParenthesis, Ident],
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[RightParenthesis, FunctionToken],
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[RightParenthesis, Percentage],
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[RightParenthesis, Dimension],
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[RightParenthesis, Hash],
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[RightParenthesis, '-']
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]);
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function createMap(pairs) {
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const isWhiteSpaceRequired = new Set(
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pairs.map(([prev, next]) => (code(prev) << 16 | code(next)))
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);
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return function(prevCode, type, value) {
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const nextCode = code(type, value);
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const nextCharCode = value.charCodeAt(0);
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const emitWs =
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(nextCharCode === HYPHENMINUS &&
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type !== Ident &&
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type !== FunctionToken &&
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type !== CDC) ||
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(nextCharCode === PLUSSIGN)
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? isWhiteSpaceRequired.has(prevCode << 16 | nextCharCode << 8)
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: isWhiteSpaceRequired.has(prevCode << 16 | nextCode);
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if (emitWs) {
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this.emit(' ', WhiteSpace, true);
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}
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return nextCode;
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};
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}
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export const spec = createMap(specPairs);
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export const safe = createMap(safePairs);
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