bdf91b5941
This is purely a mechanical change, not taking advantage of block scope of "let" and "const". Minimizing variable scope will come in the next commit. In general, "var" is converted into "let" and "const" is used only for immutable variables of permanent character (generally spelled in ALL_CAPS). Using it for any immutable variable regardless on its permanence would feel confusing. Any code which is not transpiled and needs to run in ES6 environment (examples, code in grammars embedded in specs, ...) is kept unchanged. This is also true for code generated by PEG.js. See #442.
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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