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Issue 5665229014827008: Issue 150 - [Typed objects] Implement string type (Closed)
Patch Set: Created May 19, 2014, 3:15 p.m.
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1 /*
2 * This file is part of Adblock Plus <http://adblockplus.org/>,
3 * Copyright (C) 2006-2014 Eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 "use strict";
19
20 let {uint16} = require("typedObjects/primitiveTypes");
21
22 let string = exports.string = uint16.Array({
23 toString: function()
24 {
25 let buffer = this.getArrayBuffer();
26 if (!buffer)
27 return "";
28 let array = new Uint16Array(buffer, this.arrayByteOffset, this.length);
29 return String.fromCharCode.apply(null, array);
30 }
31 }, {
32 constructor: function(value, offset, length)
33 {
34 let type = typeof value;
35 if (type == "number")
36 this.length = value | 0;
37 else if (type == "string" || (value && string.isInstance(value)))
38 {
39 let sourceLength = value.length | 0;
40 offset = Math.min(sourceLength, offset | 0)
41 length = (typeof length == "number" ? length | 0 : sourceLength);
42 length = Math.min(length, sourceLength - offset);
43 this.length = length;
44
45 if (length > 0)
46 {
47 let dest = new Uint16Array(this.getArrayBuffer(), this.arrayByteOffset, length);
48 if (type == "string")
49 {
50 for (let i = 0; i < length; i++, offset++)
51 dest[i] = value.charCodeAt(offset);
52 }
53 else
54 {
55 let src = new Uint16Array(value.getArrayBuffer(),
56 value.arrayByteOffset + offset * (uint16.referenceLength | 0),
57 length);
58 dest.set(src);
59 }
60 }
61 }
62 }
63 });
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