resources/lib/jquery.i18n/src/jquery.i18n.emitter.js

   1 /**
   2  * jQuery Internationalization library
   3  *
   4  * Copyright (C) 2011-2013 Santhosh Thottingal, Neil Kandalgaonkar
   5  *
   6  * jquery.i18n is dual licensed GPLv2 or later and MIT. You don't have to do
   7  * anything special to choose one license or the other and you don't have to
   8  * notify anyone which license you are using. You are free to use
   9  * UniversalLanguageSelector in commercial projects as long as the copyright
  10  * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
  11  *
  12  * @licence GNU General Public Licence 2.0 or later
  13  * @licence MIT License
  14  */
  15
  16 ( function ( $ ) {
  17         'use strict';
  18
  19         var MessageParserEmitter = function () {
  20                 this.language = $.i18n.languages[String.locale] || $.i18n.languages['default'];
  21         };
  22
  23         MessageParserEmitter.prototype = {
  24                 constructor: MessageParserEmitter,
  25
  26                 /**
  27                  * (We put this method definition here, and not in prototype, to make
  28                  * sure it's not overwritten by any magic.) Walk entire node structure,
  29                  * applying replacements and template functions when appropriate
  30                  *
  31                  * @param {Mixed} node abstract syntax tree (top node or subnode)
  32                  * @param {Array} replacements for $1, $2, ... $n
  33                  * @return {Mixed} single-string node or array of nodes suitable for
  34                  *  jQuery appending.
  35                  */
  36                 emit: function ( node, replacements ) {
  37                         var ret, subnodes, operation,
  38                                 messageParserEmitter = this;
  39
  40                         switch ( typeof node ) {
  41                         case 'string':
  42                         case 'number':
  43                                 ret = node;
  44                                 break;
  45                         case 'object':
  46                                 // node is an array of nodes
  47                                 subnodes = $.map( node.slice( 1 ), function ( n ) {
  48                                         return messageParserEmitter.emit( n, replacements );
  49                                 } );
  50
  51                                 operation = node[0].toLowerCase();
  52
  53                                 if ( typeof messageParserEmitter[operation] === 'function' ) {
  54                                         ret = messageParserEmitter[operation]( subnodes, replacements );
  55                                 } else {
  56                                         throw new Error( 'unknown operation "' + operation + '"' );
  57                                 }
  58
  59                                 break;
  60                         case 'undefined':
  61                                 // Parsing the empty string (as an entire expression, or as a
  62                                 // paramExpression in a template) results in undefined
  63                                 // Perhaps a more clever parser can detect this, and return the
  64                                 // empty string? Or is that useful information?
  65                                 // The logical thing is probably to return the empty string here
  66                                 // when we encounter undefined.
  67                                 ret = '';
  68                                 break;
  69                         default:
  70                                 throw new Error( 'unexpected type in AST: ' + typeof node );
  71                         }
  72
  73                         return ret;
  74                 },
  75
  76                 /**
  77                  * Parsing has been applied depth-first we can assume that all nodes
  78                  * here are single nodes Must return a single node to parents -- a
  79                  * jQuery with synthetic span However, unwrap any other synthetic spans
  80                  * in our children and pass them upwards
  81                  *
  82                  * @param {Array} nodes Mixed, some single nodes, some arrays of nodes.
  83                  * @return String
  84                  */
  85                 concat: function ( nodes ) {
  86                         var result = '';
  87
  88                         $.each( nodes, function ( i, node ) {
  89                                 // strings, integers, anything else
  90                                 result += node;
  91                         } );
  92
  93                         return result;
  94                 },
  95
  96                 /**
  97                  * Return escaped replacement of correct index, or string if
  98                  * unavailable. Note that we expect the parsed parameter to be
  99                  * zero-based. i.e. $1 should have become [ 0 ]. if the specified
 100                  * parameter is not found return the same string (e.g. "$99" ->
 101                  * parameter 98 -> not found -> return "$99" ) TODO throw error if
 102                  * nodes.length > 1 ?
 103                  *
 104                  * @param {Array} nodes One element, integer, n >= 0
 105                  * @param {Array} replacements for $1, $2, ... $n
 106                  * @return {string} replacement
 107                  */
 108                 replace: function ( nodes, replacements ) {
 109                         var index = parseInt( nodes[0], 10 );
 110
 111                         if ( index < replacements.length ) {
 112                                 // replacement is not a string, don't touch!
 113                                 return replacements[index];
 114                         } else {
 115                                 // index not found, fallback to displaying variable
 116                                 return '$' + ( index + 1 );
 117                         }
 118                 },
 119
 120                 /**
 121                  * Transform parsed structure into pluralization n.b. The first node may
 122                  * be a non-integer (for instance, a string representing an Arabic
 123                  * number). So convert it back with the current language's
 124                  * convertNumber.
 125                  *
 126                  * @param {Array} nodes List [ {String|Number}, {String}, {String} ... ]
 127                  * @return {String} selected pluralized form according to current
 128                  *  language.
 129                  */
 130                 plural: function ( nodes ) {
 131                         var count = parseFloat( this.language.convertNumber( nodes[0], 10 ) ),
 132                                 forms = nodes.slice( 1 );
 133
 134                         return forms.length ? this.language.convertPlural( count, forms ) : '';
 135                 },
 136
 137                 /**
 138                  * Transform parsed structure into gender Usage
 139                  * {{gender:gender|masculine|feminine|neutral}}.
 140                  *
 141                  * @param {Array} nodes List [ {String}, {String}, {String} , {String} ]
 142                  * @return {String} selected gender form according to current language
 143                  */
 144                 gender: function ( nodes ) {
 145                         var gender = nodes[0],
 146                                 forms = nodes.slice( 1 );
 147
 148                         return this.language.gender( gender, forms );
 149                 },
 150
 151                 /**
 152                  * Transform parsed structure into grammar conversion. Invoked by
 153                  * putting {{grammar:form|word}} in a message
 154                  *
 155                  * @param {Array} nodes List [{Grammar case eg: genitive}, {String word}]
 156                  * @return {String} selected grammatical form according to current
 157                  *  language.
 158                  */
 159                 grammar: function ( nodes ) {
 160                         var form = nodes[0],
 161                                 word = nodes[1];
 162
 163                         return word && form && this.language.convertGrammar( word, form );
 164                 }
 165         };
 166
 167         $.extend( $.i18n.parser.emitter, new MessageParserEmitter() );
 168 }( jQuery ) );