var common = require('../common');
var assert = require('assert');
var StringDecoder = require('string_decoder').StringDecoder;
-var decoder = new StringDecoder('utf8');
-
-
-
-var buffer = new Buffer('$');
-assert.deepEqual('$', decoder.write(buffer));
-
-buffer = new Buffer('¢');
-assert.deepEqual('', decoder.write(buffer.slice(0, 1)));
-assert.deepEqual('¢', decoder.write(buffer.slice(1, 2)));
-
-buffer = new Buffer('€');
-assert.deepEqual('', decoder.write(buffer.slice(0, 1)));
-assert.deepEqual('', decoder.write(buffer.slice(1, 2)));
-assert.deepEqual('€', decoder.write(buffer.slice(2, 3)));
-
-buffer = new Buffer([0xF0, 0xA4, 0xAD, 0xA2]);
-var s = '';
-s += decoder.write(buffer.slice(0, 1));
-s += decoder.write(buffer.slice(1, 2));
-s += decoder.write(buffer.slice(2, 3));
-s += decoder.write(buffer.slice(3, 4));
-assert.ok(s.length > 0);
-
-// CESU-8
-buffer = new Buffer('EDA0BDEDB18D', 'hex'); // THUMBS UP SIGN (in CESU-8)
-var s = '';
-s += decoder.write(buffer.slice(0, 1));
-s += decoder.write(buffer.slice(1, 2));
-s += decoder.write(buffer.slice(2, 3)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(3, 4));
-s += decoder.write(buffer.slice(4, 5));
-s += decoder.write(buffer.slice(5, 6)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 2));
-s += decoder.write(buffer.slice(2, 4)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(4, 6)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 3)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(3, 6)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 4)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(4, 5));
-s += decoder.write(buffer.slice(5, 6)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 5)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(5, 6)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 6));
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-
-// UCS-2
-decoder = new StringDecoder('ucs2');
-buffer = new Buffer('ab', 'ucs2');
-assert.equal(decoder.write(buffer), 'ab'); // 2 complete chars
-buffer = new Buffer('abc', 'ucs2');
-assert.equal(decoder.write(buffer.slice(0, 3)), 'a'); // 'a' and first of 'b'
-assert.equal(decoder.write(buffer.slice(3, 6)), 'bc'); // second of 'b' and 'c'
-
-
-// UTF-16LE
-buffer = new Buffer('3DD84DDC', 'hex'); // THUMBS UP SIGN (in CESU-8)
-var s = '';
-s += decoder.write(buffer.slice(0, 1));
-s += decoder.write(buffer.slice(1, 2)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(2, 3));
-s += decoder.write(buffer.slice(3, 4)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 2)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(2, 4)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 3)); // complete lead surrogate
-assert.equal(s, '');
-s += decoder.write(buffer.slice(3, 4)); // complete trail surrogate
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
-
-var s = '';
-s += decoder.write(buffer.slice(0, 4));
-assert.equal(s, '\uD83D\uDC4D'); // THUMBS UP SIGN (in UTF-16)
+process.stdout.write('scanning ');
+// UTF-8
+test('utf-8', new Buffer('$', 'utf-8'), '$');
+test('utf-8', new Buffer('¢', 'utf-8'), '¢');
+test('utf-8', new Buffer('€', 'utf-8'), '€');
+test('utf-8', new Buffer('𤭢', 'utf-8'), '𤭢');
// A mixed ascii and non-ascii string
// Test stolen from deps/v8/test/cctest/test-strings.cc
// U+02E4 -> CB A4
// U+12E4 -> E1 8B A4
// U+0030 -> 30
// U+3045 -> E3 81 85
-var expected = '\u02e4\u0064\u12e4\u0030\u3045';
-var buffer = new Buffer([0xCB, 0xA4, 0x64, 0xE1, 0x8B, 0xA4,
- 0x30, 0xE3, 0x81, 0x85]);
-var charLengths = [0, 0, 1, 2, 2, 2, 3, 4, 4, 4, 5, 5];
+test(
+ 'utf-8',
+ new Buffer([0xCB, 0xA4, 0x64, 0xE1, 0x8B, 0xA4, 0x30, 0xE3, 0x81, 0x85]),
+ '\u02e4\u0064\u12e4\u0030\u3045'
+);
+
+// CESU-8
+test('utf-8', new Buffer('EDA0BDEDB18D', 'hex'), '\ud83d\udc4d'); // thumbs up
+
+// UCS-2
+test('ucs2', new Buffer('ababc', 'ucs2'), 'ababc');
+
+// UTF-16LE
+test('ucs2', new Buffer('3DD84DDC', 'hex'), '\ud83d\udc4d'); // thumbs up
-// Split the buffer into 3 segments
-// |----|------|-------|
-// 0 i j buffer.length
-// Scan through every possible 3 segment combination
-// and make sure that the string is always parsed.
-common.print('scanning ');
-for (var j = 2; j < buffer.length; j++) {
- for (var i = 1; i < j; i++) {
- var decoder = new StringDecoder('utf8');
+console.log(' crayon!');
- var sum = decoder.write(buffer.slice(0, i));
+// test verifies that StringDecoder will correctly decode the given input
+// buffer with the given encoding to the expected output. It will attempt all
+// possible ways to write() the input buffer, see writeSequences(). The
+// singleSequence allows for easy debugging of a specific sequence which is
+// useful in case of test failures.
+function test(encoding, input, expected, singleSequence) {
+ var sequences;
+ if (!singleSequence) {
+ sequences = writeSequences(input.length);
+ } else {
+ sequences = [singleSequence];
+ }
+ sequences.forEach(function(sequence) {
+ var decoder = new StringDecoder(encoding);
+ var output = '';
+ sequence.forEach(function(write) {
+ output += decoder.write(input.slice(write[0], write[1]));
+ });
+ process.stdout.write('.');
+ if (output !== expected) {
+ var message =
+ 'Expected "'+unicodeEscape(expected)+'", '+
+ 'but got "'+unicodeEscape(output)+'"\n'+
+ 'Write sequence: '+JSON.stringify(sequence)+'\n'+
+ 'Decoder charBuffer: 0x'+decoder.charBuffer.toString('hex')+'\n'+
+ 'Full Decoder State: '+JSON.stringify(decoder, null, 2);
+ assert.fail(output, expected, message);
+ }
+ });
+}
- // just check that we've received the right amount
- // after the first write
- assert.equal(charLengths[i], sum.length);
+// unicodeEscape prints the str contents as unicode escape codes.
+function unicodeEscape(str) {
+ var r = '';
+ for (var i = 0; i < str.length; i++) {
+ r += '\\u'+str.charCodeAt(i).toString(16);
+ }
+ return r;
+}
- sum += decoder.write(buffer.slice(i, j));
- sum += decoder.write(buffer.slice(j, buffer.length));
- assert.equal(expected, sum);
- common.print('.');
+// writeSequences returns an array of arrays that describes all possible ways a
+// buffer of the given length could be split up and passed to sequential write
+// calls.
+//
+// e.G. writeSequences(3) will return: [
+// [ [ 0, 3 ] ],
+// [ [ 0, 2 ], [ 2, 3 ] ],
+// [ [ 0, 1 ], [ 1, 3 ] ],
+// [ [ 0, 1 ], [ 1, 2 ], [ 2, 3 ] ]
+// ]
+function writeSequences(length, start, sequence) {
+ if (start === undefined) {
+ start = 0;
+ sequence = []
+ } else if (start === length) {
+ return [sequence];
}
+ var sequences = [];
+ for (var end = length; end > start; end--) {
+ var subSequence = sequence.concat([[start, end]]);
+ var subSequences = writeSequences(length, end, subSequence, sequences);
+ sequences = sequences.concat(subSequences);
+ }
+ return sequences;
}
-console.log(' crayon!');