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comparison: dom/encoding/test/unit/test_utf.js
dom/encoding/test/unit/test_utf.js
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| 1 // NOTE: Requires testharness.js | |
| 2 // http://www.w3.org/2008/webapps/wiki/Harness | |
| 3 | |
| 4 // Extension to testharness.js API which avoids logging enormous strings | |
| 5 // on a coding failure. | |
| 6 function assert_string_equals(actual, expected, description) { | |
| 7 // short circuit success case | |
| 8 if (actual === expected) { | |
| 9 assert_true(true, description + ": <actual> === <expected>"); | |
| 10 return; | |
| 11 } | |
| 12 | |
| 13 // length check | |
| 14 assert_equals(actual.length, expected.length, | |
| 15 description + ": string lengths") | |
| 16 | |
| 17 var i, a, b; | |
| 18 for (i = 0; i < actual.length; i++) { | |
| 19 a = actual.charCodeAt(i); | |
| 20 b = expected.charCodeAt(i); | |
| 21 if (a !== b) | |
| 22 assert_true(false, | |
| 23 description + | |
| 24 ": code unit " + i.toString() + " unequal: " + | |
| 25 cpname(a) + " != " + cpname(b)); // doesn't return | |
| 26 } | |
| 27 | |
| 28 // It should be impossible to get here, because the initial | |
| 29 // comparison failed, so either the length comparison or the | |
| 30 // codeunit-by-codeunit comparison should also fail. | |
| 31 assert_true(false, description + ": failed to detect string difference"); | |
| 32 } | |
| 33 | |
| 34 // Inspired by: | |
| 35 // http://ecmanaut.blogspot.com/2006/07/encoding-decoding-utf8-in-javascript.html | |
| 36 function encode_utf8(string) { | |
| 37 var utf8 = unescape(encodeURIComponent(string)); | |
| 38 var octets = new Uint8Array(utf8.length), i; | |
| 39 for (i = 0; i < utf8.length; i += 1) { | |
| 40 octets[i] = utf8.charCodeAt(i); | |
| 41 } | |
| 42 return octets; | |
| 43 } | |
| 44 | |
| 45 function decode_utf8(octets) { | |
| 46 var utf8 = String.fromCharCode.apply(null, octets); | |
| 47 return decodeURIComponent(escape(utf8)); | |
| 48 } | |
| 49 | |
| 50 // Helpers for test_utf_roundtrip. | |
| 51 function cpname(n) { | |
| 52 if (n+0 !== n) | |
| 53 return n.toString(); | |
| 54 var w = (n <= 0xFFFF) ? 4 : 6; | |
| 55 return 'U+' + ('000000' + n.toString(16).toUpperCase()).slice(-w); | |
| 56 } | |
| 57 | |
| 58 function genblock(from, len) { | |
| 59 var i, j, point, offset; | |
| 60 var size, block; | |
| 61 | |
| 62 // determine size required: | |
| 63 // 1 unit for each point from U+000000 through U+00D7FF | |
| 64 // 0 units U+00D800 through U+00DFFF | |
| 65 // 1 unit U+00E000 through U+00FFFF | |
| 66 // 2 units U+010000 through U+10FFFF | |
| 67 function overlap(min1, max1, min2, max2) { | |
| 68 return Math.max(0, Math.min(max1, max2) - Math.max(min1, min2)); | |
| 69 } | |
| 70 size = (overlap(from, from+len, 0x000000, 0x00D800) + | |
| 71 overlap(from, from+len, 0x00E000, 0x010000) + | |
| 72 overlap(from, from+len, 0x010000, 0x110000)*2); | |
| 73 | |
| 74 block = new Uint16Array(size); | |
| 75 for (i = 0, j = 0; i < len; i++) { | |
| 76 point = from + i; | |
| 77 if (0xD800 <= point && point <= 0xDFFF) | |
| 78 continue; | |
| 79 else if (point <= 0xFFFF) | |
| 80 block[j++] = point; | |
| 81 else { | |
| 82 offset = point - 0x10000; | |
| 83 block[j++] = 0xD800 + (offset >> 10); | |
| 84 block[j++] = 0xDC00 + (offset & 0x3FF); | |
| 85 } | |
| 86 } | |
| 87 return String.fromCharCode.apply(null, block); | |
| 88 } | |
| 89 | |
| 90 function test_utf_roundtrip () { | |
| 91 var MIN_CODEPOINT = 0; | |
| 92 var MAX_CODEPOINT = 0x10FFFF; | |
| 93 var BLOCK_SIZE = 0x1000; | |
| 94 | |
| 95 var block, block_tag, i, j, encoded, decoded, exp_encoded, exp_decoded; | |
| 96 | |
| 97 var TE_U16LE = new TextEncoder("UTF-16LE"); | |
| 98 var TD_U16LE = new TextDecoder("UTF-16LE"); | |
| 99 | |
| 100 var TE_U16BE = new TextEncoder("UTF-16BE"); | |
| 101 var TD_U16BE = new TextDecoder("UTF-16BE"); | |
| 102 | |
| 103 var TE_U8 = new TextEncoder("UTF-8"); | |
| 104 var TD_U8 = new TextDecoder("UTF-8"); | |
| 105 | |
| 106 for (i = MIN_CODEPOINT; i < MAX_CODEPOINT; i += BLOCK_SIZE) { | |
| 107 block_tag = cpname(i) + " - " + cpname(i + BLOCK_SIZE - 1); | |
| 108 block = genblock(i, BLOCK_SIZE); | |
| 109 | |
| 110 // test UTF-16LE, UTF-16BE, and UTF-8 encodings against themselves | |
| 111 encoded = TE_U16LE.encode(block); | |
| 112 decoded = TD_U16LE.decode(encoded); | |
| 113 assert_string_equals(block, decoded, "UTF-16LE round trip " + block_tag); | |
| 114 | |
| 115 encoded = TE_U16BE.encode(block); | |
| 116 decoded = TD_U16BE.decode(encoded); | |
| 117 assert_string_equals(block, decoded, "UTF-16BE round trip " + block_tag); | |
| 118 | |
| 119 encoded = TE_U8.encode(block); | |
| 120 decoded = TD_U8.decode(encoded); | |
| 121 assert_string_equals(block, decoded, "UTF-8 round trip " + block_tag); | |
| 122 | |
| 123 // test TextEncoder(UTF-8) against the older idiom | |
| 124 exp_encoded = encode_utf8(block); | |
| 125 assert_array_equals(encoded, exp_encoded, | |
| 126 "UTF-8 reference encoding " + block_tag); | |
| 127 | |
| 128 exp_decoded = decode_utf8(exp_encoded); | |
| 129 assert_string_equals(decoded, exp_decoded, | |
| 130 "UTF-8 reference decoding " + block_tag); | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 function test_utf_samples () { | |
| 135 // z, cent, CJK water, G-Clef, Private-use character | |
| 136 var sample = "z\xA2\u6C34\uD834\uDD1E\uDBFF\uDFFD"; | |
| 137 var cases = [ | |
| 138 { encoding: "utf-8", | |
| 139 expected: [0x7A, 0xC2, 0xA2, 0xE6, 0xB0, 0xB4, 0xF0, 0x9D, 0x84, 0x9E, 0xF4, 0x8F, 0xBF, 0xBD] }, | |
| 140 { encoding: "utf-16le", | |
| 141 expected: [0x7A, 0x00, 0xA2, 0x00, 0x34, 0x6C, 0x34, 0xD8, 0x1E, 0xDD, 0xFF, 0xDB, 0xFD, 0xDF] }, | |
| 142 { encoding: "utf-16", | |
| 143 expected: [0x7A, 0x00, 0xA2, 0x00, 0x34, 0x6C, 0x34, 0xD8, 0x1E, 0xDD, 0xFF, 0xDB, 0xFD, 0xDF] }, | |
| 144 { encoding: "utf-16be", | |
| 145 expected: [0x00, 0x7A, 0x00, 0xA2, 0x6C, 0x34, 0xD8, 0x34, 0xDD, 0x1E, 0xDB, 0xFF, 0xDF, 0xFD] } | |
| 146 ]; | |
| 147 | |
| 148 cases.forEach( | |
| 149 function(t) { | |
| 150 var encoded = new TextEncoder(t.encoding).encode(sample); | |
| 151 assert_array_equals(encoded, t.expected, | |
| 152 "expected equal encodings - " + t.encoding); | |
| 153 | |
| 154 var decoded = new TextDecoder(t.encoding) | |
| 155 .decode(new Uint8Array(t.expected)); | |
| 156 assert_equals(decoded, sample, | |
| 157 "expected equal decodings - " + t.encoding); | |
| 158 }); | |
| 159 } | |
| 160 | |
| 161 test(test_utf_samples, | |
| 162 "UTF-8, UTF-16LE, UTF-16BE - Encode/Decode - reference sample"); | |
| 163 | |
| 164 test(test_utf_roundtrip, | |
| 165 "UTF-8, UTF-16LE, UTF-16BE - Encode/Decode - full roundtrip and "+ | |
| 166 "agreement with encode/decodeURIComponent"); |
