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63 lines
2.5 KiB
JavaScript
63 lines
2.5 KiB
JavaScript
"use strict";
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function hex( ch ) {
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return ch.charCodeAt( 0 ).toString( 16 ).toUpperCase();
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}
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// JavaScript code generation helpers.
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const 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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