var common = require('../common'); var assert = require('assert'); var StringDecoder = require('string_decoder').StringDecoder; 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+0064 -> 64 // U+12E4 -> E1 8B A4 // U+0030 -> 30 // U+3045 -> E3 81 85 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 console.log(' crayon!'); // 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); } }); } // 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; } // 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; }