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( function ( $, mw ) {
var simpleSample, U_20AC, poop, mbSample,
trimByteLength = require( 'mediawiki.String' ).trimByteLength;
QUnit.module( 'mediawiki.String.trimByteLength', QUnit.newMwEnvironment() );
// Simple sample (20 chars, 20 bytes)
simpleSample = '12345678901234567890';
// 3 bytes (euro-symbol)
U_20AC = '\u20AC';
// Outside of the BMP (pile of poo emoji)
poop = '\uD83D\uDCA9'; // "💩"
// Multi-byte sample (22 chars, 26 bytes)
mbSample = '1234567890' + U_20AC + '1234567890' + U_20AC;
/**
* Test factory for mw.String#trimByteLength
*
* @param {Object} options
* @param {string} options.description Test name
* @param {string} options.sample Sequence of characters to trim
* @param {string} [options.initial] Previous value of the sequence of characters, if any
* @param {Number} options.limit Length to trim to
* @param {Function} [options.fn] Filter function
* @param {string} options.expected Expected final value
*/
function byteLimitTest( options ) {
var opt = $.extend( {
description: '',
sample: '',
initial: '',
limit: 0,
fn: function ( a ) { return a; },
expected: ''
}, options );
QUnit.test( opt.description, function ( assert ) {
var res = trimByteLength( opt.initial, opt.sample, opt.limit, opt.fn );
assert.equal(
res.newVal,
opt.expected,
'New value matches the expected string'
);
} );
}
byteLimitTest( {
description: 'Limit using the maxlength attribute',
limit: 10,
sample: simpleSample,
expected: '1234567890'
} );
byteLimitTest( {
description: 'Limit using a custom value (multibyte)',
limit: 14,
sample: mbSample,
expected: '1234567890' + U_20AC + '1'
} );
byteLimitTest( {
description: 'Limit using a custom value (multibyte, outside BMP)',
limit: 3,
sample: poop,
expected: ''
} );
byteLimitTest( {
description: 'Limit using a custom value (multibyte) overlapping a byte',
limit: 12,
sample: mbSample,
expected: '1234567890'
} );
byteLimitTest( {
description: 'Pass the limit and a callback as input filter',
limit: 6,
fn: function ( val ) {
var title = mw.Title.newFromText( String( val ) );
// Return without namespace prefix
return title ? title.getMain() : '';
},
sample: 'User:Sample',
expected: 'User:Sample'
} );
byteLimitTest( {
description: 'Pass the limit and a callback as input filter',
limit: 6,
fn: function ( val ) {
var title = mw.Title.newFromText( String( val ) );
// Return without namespace prefix
return title ? title.getMain() : '';
},
sample: 'User:Example',
// The callback alters the value to be used to calculeate
// the length. The altered value is "Exampl" which has
// a length of 6, the "e" would exceed the limit.
expected: 'User:Exampl'
} );
byteLimitTest( {
description: 'Input filter that increases the length',
limit: 10,
fn: function ( text ) {
return 'prefix' + text;
},
sample: simpleSample,
// Prefix adds 6 characters, limit is reached after 4
expected: '1234'
} );
byteLimitTest( {
description: 'Trim from insertion when limit exceeded',
limit: 3,
initial: 'abc',
sample: 'zabc',
// Trim from the insertion point (at 0), not the end
expected: 'abc'
} );
byteLimitTest( {
description: 'Trim from insertion when limit exceeded',
limit: 3,
initial: 'abc',
sample: 'azbc',
// Trim from the insertion point (at 1), not the end
expected: 'abc'
} );
byteLimitTest( {
description: 'Do not cut up false matching substrings in emoji insertions',
limit: 12,
initial: '\uD83D\uDCA9\uD83D\uDCA9', // "💩💩"
sample: '\uD83D\uDCA9\uD83D\uDCB9\uD83E\uDCA9\uD83D\uDCA9', // "💩💹🢩💩"
expected: '\uD83D\uDCA9\uD83D\uDCB9\uD83D\uDCA9' // "💩💹💩"
} );
byteLimitTest( {
description: 'Unpaired surrogates do not crash',
limit: 4,
sample: '\uD800\uD800\uDFFF',
expected: '\uD800'
} );
}( jQuery, mediaWiki ) );
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