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annotate contrib/babel.js @ 530:85e1beadacb0

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Update the copyright line.
author jruigrok
date Sat, 05 Mar 2011 15:22:28 +0000
parents a03ce004eff1
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362
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1 /**
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2 * Babel JavaScript Support
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3 *
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4 * Copyright (C) 2008-2011 Edgewall Software
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5 * All rights reserved.
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6 *
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7 * This software is licensed as described in the file COPYING, which
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8 * you should have received as part of this distribution. The terms
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9 * are also available at http://babel.edgewall.org/wiki/License.
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10 *
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11 * This software consists of voluntary contributions made by many
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12 * individuals. For the exact contribution history, see the revision
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13 * history and logs, available at http://babel.edgewall.org/log/.
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14 */
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15
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16 /**
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17 * A simple module that provides a gettext like translation interface.
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18 * The catalog passed to load() must be a object conforming to this
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19 * interface::
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20 *
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21 * {
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22 * messages: an object of {msgid: translations} items where
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23 * translations is an array of messages or a single
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24 * string if the message is not pluralizable.
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25 * plural_expr: the plural expression for the language.
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26 * locale: the identifier for this locale.
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27 * domain: the name of the domain.
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28 * }
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29 *
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30 * Missing elements in the object are ignored.
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31 *
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32 * Typical usage::
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33 *
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34 * var translations = babel.Translations.load(...).install();
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35 */
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36 var babel = new function() {
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37
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38 var defaultPluralExpr = function(n) { return n == 1 ? 0 : 1; };
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39 var formatRegex = /%?%(?:\(([^\)]+)\))?([disr])/g;
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40
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41 /**
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42 * A translations object implementing the gettext interface
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43 */
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44 var Translations = this.Translations = function(locale, domain) {
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45 this.messages = {};
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46 this.locale = locale || 'unknown';
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47 this.domain = domain || 'messages';
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48 this.pluralexpr = defaultPluralExpr;
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49 };
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50
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51 /**
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52 * Create a new translations object from the catalog and return it.
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53 * See the babel-module comment for more details.
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54 */
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55 Translations.load = function(catalog) {
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56 var rv = new Translations();
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57 rv.load(catalog);
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58 return rv;
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59 };
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60
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61 Translations.prototype = {
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62 /**
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63 * translate a single string.
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64 */
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65 gettext: function(string) {
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66 var translated = this.messages[string];
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67 if (typeof translated == 'undefined')
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68 return string;
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69 return (typeof translated == 'string') ? translated : translated[0];
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70 },
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71
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72 /**
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73 * translate a pluralizable string
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74 */
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75 ngettext: function(singular, plural, n) {
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76 var translated = this.messages[singular];
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77 if (typeof translated == 'undefined')
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78 return (n == 1) ? singular : plural;
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79 return translated[this.pluralexpr(n)];
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80 },
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81
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82 /**
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83 * Install this translation document wide. After this call, there are
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84 * three new methods on the window object: _, gettext and ngettext
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85 */
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86 install: function() {
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87 var self = this;
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88 window._ = window.gettext = function(string) {
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89 return self.gettext(string);
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90 };
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91 window.ngettext = function(singular, plural, n) {
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92 return self.ngettext(singular, plural, n);
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93 };
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94 return this;
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95 },
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96
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97 /**
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98 * Works like Translations.load but updates the instance rather
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99 * then creating a new one.
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100 */
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101 load: function(catalog) {
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102 if (catalog.messages)
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103 this.update(catalog.messages)
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104 if (catalog.plural_expr)
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105 this.setPluralExpr(catalog.plural_expr);
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106 if (catalog.locale)
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107 this.locale = catalog.locale;
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108 if (catalog.domain)
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109 this.domain = catalog.domain;
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110 return this;
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111 },
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112
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113 /**
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114 * Updates the translations with the object of messages.
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115 */
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116 update: function(mapping) {
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117 for (var key in mapping)
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118 if (mapping.hasOwnProperty(key))
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119 this.messages[key] = mapping[key];
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120 return this;
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121 },
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122
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123 /**
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124 * Sets the plural expression
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125 */
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126 setPluralExpr: function(expr) {
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127 this.pluralexpr = new Function('n', 'return +(' + expr + ')');
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128 return this;
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129 }
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130 };
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131
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132 /**
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133 * A python inspired string formatting function. Supports named and
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134 * positional placeholders and "s", "d" and "i" as type characters
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135 * without any formatting specifications.
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136 *
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137 * Examples::
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138 *
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139 * babel.format(_('Hello %s'), name)
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140 * babel.format(_('Progress: %(percent)s%%'), {percent: 100})
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141 */
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142 this.format = function() {
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143 var arg, string = arguments[0], idx = 0;
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144 if (arguments.length == 1)
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145 return string;
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146 else if (arguments.length == 2 && typeof arguments[1] == 'object')
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147 arg = arguments[1];
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148 else {
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149 arg = [];
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150 for (var i = 1, n = arguments.length; i != n; ++i)
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151 arg[i - 1] = arguments[i];
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152 }
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153 return string.replace(formatRegex, function(all, name, type) {
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154 if (all[0] == all[1]) return all.substring(1);
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155 var value = arg[name || idx++];
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156 return (type == 'i' || type == 'd') ? +value : value;
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157 });
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158 }
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159
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160 };
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