tests/qunit/suites/resources/jquery/jquery.lengthLimit.test.js

   1 ( function () {
   2         var simpleSample, U_20AC, poop, mbSample;
   3
   4         QUnit.module( 'jquery.lengthLimit', QUnit.newMwEnvironment() );
   5
   6         // Simple sample (20 chars, 20 bytes)
   7         simpleSample = '12345678901234567890';
   8
   9         // 3 bytes (euro-symbol)
  10         U_20AC = '\u20AC';
  11
  12         // Outside of the BMP (pile of poo emoji)
  13         poop = '\uD83D\uDCA9'; // "💩"
  14
  15         // Multi-byte sample (22 chars, 26 bytes)
  16         mbSample = '1234567890' + U_20AC + '1234567890' + U_20AC;
  17
  18         // Basic sendkey-implementation
  19         function addChars( $input, charstr ) {
  20                 var c, len;
  21
  22                 function x( $input, i ) {
  23                         // Add character to the value
  24                         return $input.val() + charstr.charAt( i );
  25                 }
  26
  27                 for ( c = 0, len = charstr.length; c < len; c += 1 ) {
  28                         $input
  29                                 .val( x( $input, c ) )
  30                                 .trigger( 'change' );
  31                 }
  32         }
  33
  34         /**
  35          * Test factory for $.fn.byteLimit
  36          *
  37          * @param {Object} options
  38          * @param {string} options.description Test name
  39          * @param {jQuery} options.$input jQuery object in an input element
  40          * @param {string} options.sample Sequence of characters to simulate being
  41          *  added one by one
  42          * @param {string} options.expected Expected final value of `$input`
  43          */
  44         function byteLimitTest( options ) {
  45                 var opt = $.extend( {
  46                         description: '',
  47                         $input: null,
  48                         sample: '',
  49                         expected: ''
  50                 }, options );
  51
  52                 QUnit.test( opt.description, function ( assert ) {
  53                         opt.$input.appendTo( '#qunit-fixture' );
  54
  55                         // Simulate pressing keys for each of the sample characters
  56                         addChars( opt.$input, opt.sample );
  57
  58                         assert.strictEqual(
  59                                 opt.$input.val(),
  60                                 opt.expected,
  61                                 'New value matches the expected string'
  62                         );
  63                 } );
  64         }
  65
  66         byteLimitTest( {
  67                 description: 'Plain text input',
  68                 $input: $( '<input>' ).attr( 'type', 'text' ),
  69                 sample: simpleSample,
  70                 expected: simpleSample
  71         } );
  72
  73         byteLimitTest( {
  74                 description: 'Plain text input. Calling byteLimit with no parameters and no maxlength attribute (T38310)',
  75                 $input: $( '<input>' ).attr( 'type', 'text' )
  76                         .byteLimit(),
  77                 sample: simpleSample,
  78                 expected: simpleSample
  79         } );
  80
  81         byteLimitTest( {
  82                 description: 'Limit using the maxlength attribute',
  83                 $input: $( '<input>' ).attr( 'type', 'text' )
  84                         .attr( 'maxlength', '10' )
  85                         .byteLimit(),
  86                 sample: simpleSample,
  87                 expected: '1234567890'
  88         } );
  89
  90         byteLimitTest( {
  91                 description: 'Limit using a custom value',
  92                 $input: $( '<input>' ).attr( 'type', 'text' )
  93                         .byteLimit( 10 ),
  94                 sample: simpleSample,
  95                 expected: '1234567890'
  96         } );
  97
  98         byteLimitTest( {
  99                 description: 'Limit using a custom value, overriding maxlength attribute',
 100                 $input: $( '<input>' ).attr( 'type', 'text' )
 101                         .attr( 'maxlength', '10' )
 102                         .byteLimit( 15 ),
 103                 sample: simpleSample,
 104                 expected: '123456789012345'
 105         } );
 106
 107         byteLimitTest( {
 108                 description: 'Limit using a custom value (multibyte)',
 109                 $input: $( '<input>' ).attr( 'type', 'text' )
 110                         .byteLimit( 14 ),
 111                 sample: mbSample,
 112                 expected: '1234567890' + U_20AC + '1'
 113         } );
 114
 115         byteLimitTest( {
 116                 description: 'Limit using a custom value (multibyte, outside BMP)',
 117                 $input: $( '<input>' ).attr( 'type', 'text' )
 118                         .byteLimit( 3 ),
 119                 sample: poop,
 120                 expected: ''
 121         } );
 122
 123         byteLimitTest( {
 124                 description: 'Limit using a custom value (multibyte) overlapping a byte',
 125                 $input: $( '<input>' ).attr( 'type', 'text' )
 126                         .byteLimit( 12 ),
 127                 sample: mbSample,
 128                 expected: '123456789012'
 129         } );
 130
 131         byteLimitTest( {
 132                 description: 'Pass the limit and a callback as input filter',
 133                 $input: $( '<input>' ).attr( 'type', 'text' )
 134                         .byteLimit( 6, function ( val ) {
 135                                 var title = mw.Title.newFromText( String( val ) );
 136                                 // Return without namespace prefix
 137                                 return title ? title.getMain() : '';
 138                         } ),
 139                 sample: 'User:Sample',
 140                 expected: 'User:Sample'
 141         } );
 142
 143         byteLimitTest( {
 144                 description: 'Limit using the maxlength attribute and pass a callback as input filter',
 145                 $input: $( '<input>' ).attr( 'type', 'text' )
 146                         .attr( 'maxlength', '6' )
 147                         .byteLimit( function ( val ) {
 148                                 var title = mw.Title.newFromText( String( val ) );
 149                                 // Return without namespace prefix
 150                                 return title ? title.getMain() : '';
 151                         } ),
 152                 sample: 'User:Sample',
 153                 expected: 'User:Sample'
 154         } );
 155
 156         byteLimitTest( {
 157                 description: 'Pass the limit and a callback as input filter',
 158                 $input: $( '<input>' ).attr( 'type', 'text' )
 159                         .byteLimit( 6, function ( val ) {
 160                                 var title = mw.Title.newFromText( String( val ) );
 161                                 // Return without namespace prefix
 162                                 return title ? title.getMain() : '';
 163                         } ),
 164                 sample: 'User:Example',
 165                 // The callback alters the value to be used to calculeate
 166                 // the length. The altered value is "Exampl" which has
 167                 // a length of 6, the "e" would exceed the limit.
 168                 expected: 'User:Exampl'
 169         } );
 170
 171         byteLimitTest( {
 172                 description: 'Input filter that increases the length',
 173                 $input: $( '<input>' ).attr( 'type', 'text' )
 174                         .byteLimit( 10, function ( text ) {
 175                                 return 'prefix' + text;
 176                         } ),
 177                 sample: simpleSample,
 178                 // Prefix adds 6 characters, limit is reached after 4
 179                 expected: '1234'
 180         } );
 181
 182         // Regression tests for T43450
 183         byteLimitTest( {
 184                 description: 'Input filter of which the base exceeds the limit',
 185                 $input: $( '<input>' ).attr( 'type', 'text' )
 186                         .byteLimit( 3, function ( text ) {
 187                                 return 'prefix' + text;
 188                         } ),
 189                 sample: simpleSample,
 190                 expected: ''
 191         } );
 192
 193         QUnit.test( 'Confirm properties and attributes set', function ( assert ) {
 194                 var $el;
 195
 196                 $el = $( '<input>' ).attr( 'type', 'text' )
 197                         .attr( 'maxlength', '7' )
 198                         .appendTo( '#qunit-fixture' )
 199                         .byteLimit();
 200
 201                 assert.strictEqual( $el.attr( 'maxlength' ), '7', 'maxlength attribute unchanged for simple limit' );
 202
 203                 $el = $( '<input>' ).attr( 'type', 'text' )
 204                         .attr( 'maxlength', '7' )
 205                         .appendTo( '#qunit-fixture' )
 206                         .byteLimit( 12 );
 207
 208                 assert.strictEqual( $el.attr( 'maxlength' ), '12', 'maxlength attribute updated for custom limit' );
 209
 210                 $el = $( '<input>' ).attr( 'type', 'text' )
 211                         .attr( 'maxlength', '7' )
 212                         .appendTo( '#qunit-fixture' )
 213                         .byteLimit( 12, function ( val ) {
 214                                 return val;
 215                         } );
 216
 217                 assert.strictEqual( $el.attr( 'maxlength' ), undefined, 'maxlength attribute removed for limit with callback' );
 218
 219                 $( '<input>' ).attr( 'type', 'text' )
 220                         .addClass( 'mw-test-byteLimit-foo' )
 221                         .attr( 'maxlength', '7' )
 222                         .appendTo( '#qunit-fixture' );
 223
 224                 $( '<input>' ).attr( 'type', 'text' )
 225                         .addClass( 'mw-test-byteLimit-foo' )
 226                         .attr( 'maxlength', '12' )
 227                         .appendTo( '#qunit-fixture' );
 228
 229                 $el = $( '.mw-test-byteLimit-foo' );
 230
 231                 assert.strictEqual( $el.length, 2, 'Verify that there are no other elements clashing with this test suite' );
 232
 233                 $el.byteLimit();
 234         } );
 235
 236         QUnit.test( 'Trim from insertion when limit exceeded', function ( assert ) {
 237                 var $el;
 238
 239                 // Use a new <input> because the bug only occurs on the first time
 240                 // the limit it reached (T42850)
 241                 $el = $( '<input>' ).attr( 'type', 'text' )
 242                         .appendTo( '#qunit-fixture' )
 243                         .byteLimit( 3 )
 244                         .val( 'abc' ).trigger( 'change' )
 245                         .val( 'zabc' ).trigger( 'change' );
 246
 247                 assert.strictEqual( $el.val(), 'abc', 'Trim from the insertion point (at 0), not the end' );
 248
 249                 $el = $( '<input>' ).attr( 'type', 'text' )
 250                         .appendTo( '#qunit-fixture' )
 251                         .byteLimit( 3 )
 252                         .val( 'abc' ).trigger( 'change' )
 253                         .val( 'azbc' ).trigger( 'change' );
 254
 255                 assert.strictEqual( $el.val(), 'abc', 'Trim from the insertion point (at 1), not the end' );
 256         } );
 257
 258         QUnit.test( 'Do not cut up false matching substrings in emoji insertions', function ( assert ) {
 259                 var $el,
 260                         oldVal = '\uD83D\uDCA9\uD83D\uDCA9', // "💩💩"
 261                         newVal = '\uD83D\uDCA9\uD83D\uDCB9\uD83E\uDCA9\uD83D\uDCA9', // "💩💹🢩💩"
 262                         expected = '\uD83D\uDCA9\uD83D\uDCB9\uD83D\uDCA9'; // "💩💹💩"
 263
 264                 // Possible bad results:
 265                 // * With no surrogate support:
 266                 //   '\uD83D\uDCA9\uD83D\uDCB9\uD83E\uDCA9' "💩💹🢩"
 267                 // * With correct trimming but bad detection of inserted text:
 268                 //   '\uD83D\uDCA9\uD83D\uDCB9\uDCA9' "💩💹�"
 269
 270                 $el = $( '<input>' ).attr( 'type', 'text' )
 271                         .appendTo( '#qunit-fixture' )
 272                         .byteLimit( 12 )
 273                         .val( oldVal ).trigger( 'change' )
 274                         .val( newVal ).trigger( 'change' );
 275
 276                 assert.strictEqual( $el.val(), expected, 'Pasted emoji correctly trimmed at the end' );
 277         } );
 278
 279         byteLimitTest( {
 280                 description: 'Unpaired surrogates do not crash',
 281                 $input: $( '<input>' ).attr( 'type', 'text' ).byteLimit( 4 ),
 282                 sample: '\uD800\uD800\uDFFF',
 283                 expected: '\uD800'
 284         } );
 285
 286 }() );