import { isName, isValidEscape, consumeEscaped, decodeEscaped } from '../tokenizer/index.js'; const REVERSE_SOLIDUS = 0x005c; // U+005C REVERSE SOLIDUS (\) export function decode(str) { const end = str.length - 1; let decoded = ''; for (let i = 0; i < str.length; i++) { let code = str.charCodeAt(i); if (code === REVERSE_SOLIDUS) { // special case at the ending if (i === end) { // if the next input code point is EOF, do nothing break; } code = str.charCodeAt(++i); // consume escaped if (isValidEscape(REVERSE_SOLIDUS, code)) { const escapeStart = i - 1; const escapeEnd = consumeEscaped(str, escapeStart); i = escapeEnd - 1; decoded += decodeEscaped(str.substring(escapeStart + 1, escapeEnd)); } else { // \r\n if (code === 0x000d && str.charCodeAt(i + 1) === 0x000a) { i++; } } } else { decoded += str[i]; } } return decoded; } // https://drafts.csswg.org/cssom/#serialize-an-identifier // ยง 2.1. Common Serializing Idioms export function encode(str) { let encoded = ''; // If the character is the first character and is a "-" (U+002D), // and there is no second character, then the escaped character. // Note: That's means a single dash string "-" return as escaped dash, // so move the condition out of the main loop if (str.length === 1 && str.charCodeAt(0) === 0x002D) { return '\\-'; } // To serialize an identifier means to create a string represented // by the concatenation of, for each character of the identifier: for (let i = 0; i < str.length; i++) { const code = str.charCodeAt(i); // If the character is NULL (U+0000), then the REPLACEMENT CHARACTER (U+FFFD). if (code === 0x0000) { encoded += '\uFFFD'; continue; } if ( // If the character is in the range [\1-\1f] (U+0001 to U+001F) or is U+007F ... // Note: Do not compare with 0x0001 since 0x0000 is precessed before code <= 0x001F || code === 0x007F || // [or] ... is in the range [0-9] (U+0030 to U+0039), (code >= 0x0030 && code <= 0x0039 && ( // If the character is the first character ... i === 0 || // If the character is the second character ... and the first character is a "-" (U+002D) i === 1 && str.charCodeAt(0) === 0x002D )) ) { // ... then the character escaped as code point. encoded += '\\' + code.toString(16) + ' '; continue; } // If the character is not handled by one of the above rules and is greater // than or equal to U+0080, is "-" (U+002D) or "_" (U+005F), or is in one // of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to U+005A), // or \[a-z] (U+0061 to U+007A), then the character itself. if (isName(code)) { encoded += str.charAt(i); } else { // Otherwise, the escaped character. encoded += '\\' + str.charAt(i); } } return encoded; }