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comparison: toolkit/components/url-classifier/content/moz/protocol4.js
toolkit/components/url-classifier/content/moz/protocol4.js
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| 1 # This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 # License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 # file, You can obtain one at http://mozilla.org/MPL/2.0/. | |
| 4 | |
| 5 | |
| 6 // A helper class that knows how to parse from and serialize to | |
| 7 // protocol4. This is a simple, historical format used by some Google | |
| 8 // interfaces, for example the Toolbar (i.e., ancient services). | |
| 9 // | |
| 10 // Protocol4 consists of a newline-separated sequence of name/value | |
| 11 // pairs (strings). Each line consists of the name, the value length, | |
| 12 // and the value itself, all separated by colons. Example: | |
| 13 // | |
| 14 // foo:6:barbaz\n | |
| 15 // fritz:33:issickofdynamicallytypedlanguages\n | |
| 16 | |
| 17 | |
| 18 /** | |
| 19 * This class knows how to serialize/deserialize maps to/from their | |
| 20 * protocol4 representation. | |
| 21 * | |
| 22 * @constructor | |
| 23 */ | |
| 24 function G_Protocol4Parser() { | |
| 25 this.debugZone = "protocol4"; | |
| 26 | |
| 27 this.protocol4RegExp_ = new RegExp("([^:]+):\\d+:(.*)$"); | |
| 28 this.newlineRegExp_ = new RegExp("(\\r)?\\n"); | |
| 29 } | |
| 30 | |
| 31 /** | |
| 32 * Create a map from a protocol4 string. Silently skips invalid lines. | |
| 33 * | |
| 34 * @param text String holding the protocol4 representation | |
| 35 * | |
| 36 * @returns Object as an associative array with keys and values | |
| 37 * given in text. The empty object is returned if none | |
| 38 * are parsed. | |
| 39 */ | |
| 40 G_Protocol4Parser.prototype.parse = function(text) { | |
| 41 | |
| 42 var response = {}; | |
| 43 if (!text) | |
| 44 return response; | |
| 45 | |
| 46 // Responses are protocol4: (repeated) name:numcontentbytes:content\n | |
| 47 var lines = text.split(this.newlineRegExp_); | |
| 48 for (var i = 0; i < lines.length; i++) | |
| 49 if (this.protocol4RegExp_.exec(lines[i])) | |
| 50 response[RegExp.$1] = RegExp.$2; | |
| 51 | |
| 52 return response; | |
| 53 } | |
| 54 | |
| 55 /** | |
| 56 * Create a protocol4 string from a map (object). Throws an error on | |
| 57 * an invalid input. | |
| 58 * | |
| 59 * @param map Object as an associative array with keys and values | |
| 60 * given as strings. | |
| 61 * | |
| 62 * @returns text String holding the protocol4 representation | |
| 63 */ | |
| 64 G_Protocol4Parser.prototype.serialize = function(map) { | |
| 65 if (typeof map != "object") | |
| 66 throw new Error("map must be an object"); | |
| 67 | |
| 68 var text = ""; | |
| 69 for (var key in map) { | |
| 70 if (typeof map[key] != "string") | |
| 71 throw new Error("Keys and values must be strings"); | |
| 72 | |
| 73 text += key + ":" + map[key].length + ":" + map[key] + "\n"; | |
| 74 } | |
| 75 | |
| 76 return text; | |
| 77 } | |
| 78 | |
| 79 #ifdef DEBUG | |
| 80 /** | |
| 81 * Cheesey unittests | |
| 82 */ | |
| 83 function TEST_G_Protocol4Parser() { | |
| 84 if (G_GDEBUG) { | |
| 85 var z = "protocol4 UNITTEST"; | |
| 86 G_debugService.enableZone(z); | |
| 87 | |
| 88 G_Debug(z, "Starting"); | |
| 89 | |
| 90 var p = new G_Protocol4Parser(); | |
| 91 | |
| 92 function isEmpty(map) { | |
| 93 for (var key in map) | |
| 94 return false; | |
| 95 return true; | |
| 96 }; | |
| 97 | |
| 98 G_Assert(z, isEmpty(p.parse(null)), "Parsing null broken"); | |
| 99 G_Assert(z, isEmpty(p.parse("")), "Parsing nothing broken"); | |
| 100 | |
| 101 var t = "foo:3:bar"; | |
| 102 G_Assert(z, p.parse(t)["foo"] === "bar", "Parsing one line broken"); | |
| 103 | |
| 104 t = "foo:3:bar\n"; | |
| 105 G_Assert(z, p.parse(t)["foo"] === "bar", "Parsing line with lf broken"); | |
| 106 | |
| 107 t = "foo:3:bar\r\n"; | |
| 108 G_Assert(z, p.parse(t)["foo"] === "bar", "Parsing with crlf broken"); | |
| 109 | |
| 110 | |
| 111 t = "foo:3:bar\nbar:3:baz\r\nbom:3:yaz\n"; | |
| 112 G_Assert(z, p.parse(t)["foo"] === "bar", "First in multiline"); | |
| 113 G_Assert(z, p.parse(t)["bar"] === "baz", "Second in multiline"); | |
| 114 G_Assert(z, p.parse(t)["bom"] === "yaz", "Third in multiline"); | |
| 115 G_Assert(z, p.parse(t)[""] === undefined, "Nonexistent in multiline"); | |
| 116 | |
| 117 // Test serialization | |
| 118 | |
| 119 var original = { | |
| 120 "1": "1", | |
| 121 "2": "2", | |
| 122 "foobar": "baz", | |
| 123 "hello there": "how are you?" , | |
| 124 }; | |
| 125 var deserialized = p.parse(p.serialize(original)); | |
| 126 for (var key in original) | |
| 127 G_Assert(z, original[key] === deserialized[key], | |
| 128 "Trouble (de)serializing " + key); | |
| 129 | |
| 130 G_Debug(z, "PASSED"); | |
| 131 } | |
| 132 } | |
| 133 #endif |
