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48 lines
1.3 KiB
48 lines
1.3 KiB
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/** |
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* multiple ocurrences of: |
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* - alphabetical letter, underscore or dash, or |
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* - non-ascii character, or |
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* - escaped character |
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* @type {RegExp} |
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*/ |
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var rIdentifier = |
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/(?:[A-Za-z0-9_-]|[^\0-\237]|\\(?:[^A-Fa-f0-9]|[A-Fa-f0-9]{1,6} ?))+/; |
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/** |
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* backslash followed by a non-hexadecimal letter or |
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* a 1 to 6 digit hexadecimal number followed by an optional white space |
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* @type {RegExp} |
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*/ |
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var rEscapedCharacter = /\\([^A-Fa-f0-9]|[A-Fa-f0-9]{1,6} ?)/g; |
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/** |
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* Unescapes a single character |
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* @param {string} escapedCharacter escaped character starting with a backslash |
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* @return {string} unescaped character |
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*/ |
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function unescapeCharacter(escapedCharacter) { |
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var escapeValue = escapedCharacter.substr(1); |
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var numberValue = parseInt(escapeValue, 16); |
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if (isNaN(numberValue)) { |
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return escapeValue; |
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} |
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return String.fromCharCode(numberValue); |
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} |
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/** |
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* Unescapes all escaped characters in the given identifier |
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* @param {string} identifier identifier with possible escaped characters |
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* @return {string} unescaped identifier |
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*/ |
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function unescapeIdentifier(identifier) { |
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return identifier.replace(rEscapedCharacter, unescapeCharacter); |
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} |
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module.exports = { |
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rIdentifier: rIdentifier, |
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rEscapedCharacter: rEscapedCharacter, |
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unescapeIdentifier: unescapeIdentifier, |
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unescapeCharacter: unescapeCharacter |
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};
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