forked from enviPath/enviPy
51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
'use strict';
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var _ = require('lodash');
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// Taken from the punycode library
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function ucs2encode(array) {
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return _.map(array, function (value) {
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var output = '';
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if (value > 0xFFFF) {
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value -= 0x10000;
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output += String.fromCharCode(value >>> 10 & 0x3FF | 0xD800);
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value = 0xDC00 | value & 0x3FF;
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}
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output += String.fromCharCode(value);
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return output;
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}).join('');
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}
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function ucs2decode(string) {
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var output = [],
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counter = 0,
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length = string.length,
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value,
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extra;
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while (counter < length) {
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value = string.charCodeAt(counter++);
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if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
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// high surrogate, and there is a next character
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extra = string.charCodeAt(counter++);
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if ((extra & 0xFC00) === 0xDC00) { // low surrogate
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output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
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} else {
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// unmatched surrogate; only append this code unit, in case the next
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// code unit is the high surrogate of a surrogate pair
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output.push(value);
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counter--;
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}
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} else {
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output.push(value);
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}
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}
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return output;
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}
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module.exports = {
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encode: ucs2encode,
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decode: ucs2decode
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};
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