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60 lines
2.1 KiB
JavaScript
60 lines
2.1 KiB
JavaScript
"use strict";
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function hex(character) {
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return character
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.charCodeAt(0)
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.toString(16)
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.toUpperCase();
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}
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// JavaScript code generation helpers.
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let js = {
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stringEscape(s) {
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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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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, ch => "\\x0" + hex(ch))
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.replace(/[\x10-\x1F\x7F-\xFF]/g, ch => "\\x" + hex(ch))
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.replace(/[\u0100-\u0FFF]/g, ch => "\\u0" + hex(ch))
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.replace(/[\u1000-\uFFFF]/g, ch => "\\u" + hex(ch));
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},
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regexpClassEscape(s) {
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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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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, ch => "\\x0" + hex(ch))
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.replace(/[\x10-\x1F\x7F-\xFF]/g, ch => "\\x" + hex(ch))
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.replace(/[\u0100-\u0FFF]/g, ch => "\\u0" + hex(ch))
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.replace(/[\u1000-\uFFFF]/g, ch => "\\u" + hex(ch));
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}
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};
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module.exports = js;
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