77 lines
3.1 KiB
JavaScript
77 lines
3.1 KiB
JavaScript
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/**
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* CSS escaper.
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*/
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export default class CSSEscaper {
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/**
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* Escapes CSS.
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*
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* Based on:
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* https://github.com/mathiasbynens/CSS.escape
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*
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* @param cssText CSS.
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* @returns Escaped CSS.
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*/
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static escape(cssText) {
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if (arguments.length == 0) {
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throw new TypeError('`CSS.escape` requires an argument.');
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}
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const returnValue = String(cssText);
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const length = returnValue.length;
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let index = -1;
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let codeUnit;
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let result = '';
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const firstCodeUnit = returnValue.charCodeAt(0);
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if (
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// If the character is the first character and is a `-` (U+002D), and
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// There is no second character, […]
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length == 1 &&
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firstCodeUnit == 0x002d) {
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return '\\' + returnValue;
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}
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while (++index < length) {
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codeUnit = returnValue.charCodeAt(index);
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// Note: there’s no need to special-case astral symbols, surrogate
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// Pairs, or lone surrogates.
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// If the character is NULL (U+0000), then the REPLACEMENT CHARACTER
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// (U+FFFD).
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if (codeUnit == 0x0000) {
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result += '\uFFFD';
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continue;
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}
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if (
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// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
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// U+007F, […]
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(codeUnit >= 0x0001 && codeUnit <= 0x001f) ||
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codeUnit == 0x007f ||
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// If the character is the first character and is in the range [0-9]
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// (U+0030 to U+0039), […]
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(index == 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
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// If the character is the second character and is in the range [0-9]
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// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
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(index == 1 && codeUnit >= 0x0030 && codeUnit <= 0x0039 && firstCodeUnit == 0x002d)) {
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// https://drafts.csswg.org/cssom/#escape-a-character-as-code-point
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result += '\\' + codeUnit.toString(16) + ' ';
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continue;
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}
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// If the character is not handled by one of the above rules and is
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// Greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
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// Is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
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// U+005A), or [a-z] (U+0061 to U+007A), […]
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if (codeUnit >= 0x0080 ||
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codeUnit == 0x002d ||
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codeUnit == 0x005f ||
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(codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
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(codeUnit >= 0x0041 && codeUnit <= 0x005a) ||
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(codeUnit >= 0x0061 && codeUnit <= 0x007a)) {
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// The character itself
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result += returnValue.charAt(index);
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continue;
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}
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// Otherwise, the escaped character.
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// https://drafts.csswg.org/cssom/#escape-a-character
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result += '\\' + returnValue.charAt(index);
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}
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return result;
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}
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}
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//# sourceMappingURL=CSSEscaper.js.map
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