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100 lines
3.2 KiB
JavaScript
100 lines
3.2 KiB
JavaScript
/* JavaScript code generation helpers. */
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var javascript = {
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/*
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* Returns a string padded on the left to a desired length with a character.
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*
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* The code needs to be in sync with the code template in the compilation
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* function for "action" nodes.
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*/
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padLeft: function(input, padding, length) {
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var result = input;
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var padLength = length - input.length;
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for (var i = 0; i < padLength; i++) {
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result = padding + result;
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}
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return result;
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},
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/*
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* Returns an escape sequence for given character. Uses \x for characters <=
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* 0xFF to save space, \u for the rest.
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*
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* The code needs to be in sync with the code template in the compilation
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* function for "action" nodes.
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*/
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escape: function(ch) {
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var charCode = ch.charCodeAt(0);
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var escapeChar;
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var length;
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if (charCode <= 0xFF) {
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escapeChar = 'x';
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length = 2;
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} else {
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escapeChar = 'u';
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length = 4;
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}
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return '\\' + escapeChar + javascript.padLeft(charCode.toString(16).toUpperCase(), '0', length);
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},
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/*
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* Surrounds the string with quotes and escapes characters inside so that the
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* result is a valid JavaScript string.
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*
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* The code needs to be in sync with the code template in the compilation
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* function for "action" nodes.
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*/
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quote: function(s) {
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/*
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* ECMA-262, 5th ed., 7.8.4: All characters may appear literally in a string
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* literal except for the closing quote character, backslash, carriage
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* return, line separator, paragraph separator, and line feed. Any character
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* may appear in the form of an escape sequence.
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*
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* For portability, we also escape all control and non-ASCII characters.
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* Note that "\0" and "\v" escape sequences are not used because JSHint does
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* not like the first and IE the second.
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*/
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return '"' + s
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.replace(/\\/g, '\\\\') // backslash
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.replace(/"/g, '\\"') // closing quote character
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.replace(/\x08/g, '\\b') // backspace
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.replace(/\t/g, '\\t') // horizontal tab
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.replace(/\n/g, '\\n') // line feed
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.replace(/\f/g, '\\f') // form feed
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.replace(/\r/g, '\\r') // carriage return
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.replace(/[\x00-\x07\x0B\x0E-\x1F\x80-\uFFFF]/g, javascript.escape)
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+ '"';
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},
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/*
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* Escapes characters inside the string so that it can be used as a list of
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* characters in a character class of a regular expression.
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*/
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quoteForRegexpClass: function(s) {
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/*
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* Based on ECMA-262, 5th ed., 7.8.5 & 15.10.1.
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*
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* For portability, we also escape all control and non-ASCII characters.
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*/
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return s
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.replace(/\\/g, '\\\\') // backslash
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.replace(/\//g, '\\/') // closing slash
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.replace(/\]/g, '\\]') // closing bracket
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.replace(/\^/g, '\\^') // caret
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.replace(/-/g, '\\-') // dash
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.replace(/\0/g, '\\0') // null
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.replace(/\t/g, '\\t') // horizontal tab
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.replace(/\n/g, '\\n') // line feed
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.replace(/\v/g, '\\x0B') // vertical tab
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.replace(/\f/g, '\\f') // form feed
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.replace(/\r/g, '\\r') // carriage return
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.replace(/[\x01-\x08\x0E-\x1F\x80-\uFFFF]/g, javascript.escape);
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}
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};
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module.exports = javascript;
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