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59 lines
2.4 KiB
JavaScript
59 lines
2.4 KiB
JavaScript
"use strict";
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function hex(ch) { return ch.charCodeAt(0).toString(16).toUpperCase(); }
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/* JavaScript code generation helpers. */
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let js = {
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stringEscape: 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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*/
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return s
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.replace(/\\/g, '\\\\') // backslash
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.replace(/"/g, '\\"') // closing double quote
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.replace(/\0/g, '\\0') // null
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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(/\v/g, '\\v') // 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(/[\x00-\x0F]/g, function(ch) { return '\\x0' + hex(ch); })
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.replace(/[\x10-\x1F\x7F-\xFF]/g, function(ch) { return '\\x' + hex(ch); })
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.replace(/[\u0100-\u0FFF]/g, function(ch) { return '\\u0' + hex(ch); })
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.replace(/[\u1000-\uFFFF]/g, function(ch) { return '\\u' + hex(ch); });
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},
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regexpClassEscape: 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(/\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(/\v/g, '\\v') // 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(/[\x00-\x0F]/g, function(ch) { return '\\x0' + hex(ch); })
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.replace(/[\x10-\x1F\x7F-\xFF]/g, function(ch) { return '\\x' + hex(ch); })
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.replace(/[\u0100-\u0FFF]/g, function(ch) { return '\\u0' + hex(ch); })
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.replace(/[\u1000-\uFFFF]/g, function(ch) { return '\\u' + hex(ch); });
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}
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};
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module.exports = js;
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