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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| const { consumeEscaped, decodeEscaped } = require('../tokenizer/utils'); | ||
| const { | ||
| isName, | ||
| isValidEscape | ||
| } = require('../tokenizer/char-code-definitions'); | ||
|
|
||
| const REVERSE_SOLIDUS = 0x005c; // U+005C REVERSE SOLIDUS (\) | ||
|
|
||
| function decode(str) { | ||
| const end = str.length - 1; | ||
| let decoded = ''; | ||
|
|
||
| for (let i = 0; i < str.length; i++) { | ||
| let code = str.charCodeAt(i); | ||
|
|
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| 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); | ||
|
|
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| // 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; | ||
| } | ||
|
|
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| // https://drafts.csswg.org/cssom/#serialize-an-identifier | ||
| // § 2.1. Common Serializing Idioms | ||
| 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++) { | ||
| let 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; | ||
| } | ||
|
|
||
| module.exports = { | ||
| decode, | ||
| encode | ||
| }; |
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