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inflection.js
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inflection.js
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/*!
* Lingo - inflection
* Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Language = require('./language');
/**
* Check if a `word` is uncountable.
*
* @param {String} word
* @return {Boolean}
* @api public
*/
Language.prototype.isUncountable = function(word){
return !!this.rules.uncountable[word];
};
/**
* Add an uncountable `word`.
*
* @param {String} word
* @return {Language} for chaining
* @api public
*/
Language.prototype.uncountable = function(word){
this.rules.uncountable[word] = word;
return this;
};
/**
* Add an irreglar `singular` / `plural` map.
*
* @param {String} singular
* @param {String} plural
* @return {Language} for chaining
* @api public
*/
Language.prototype.irregular = function(singular, plural){
this.rules.irregular.plural[singular] = plural;
this.rules.irregular.singular[plural] = singular;
return this;
};
/**
* Add a pluralization `rule` for numbers
*
* @param {RegExp} rule
* @return {Language} for chaining
* @api public
*/
Language.prototype.pluralNumbers = function(rule){
this.rules.pluralNumbers = rule;
return this;
};
/**
* Add a pluralization `rule` with the given `substitution`.
*
* @param {RegExp} rule
* @param {String} substitution
* @return {Language} for chaining
* @api public
*/
Language.prototype.plural = function(rule, substitution){
this.rules.plural.unshift([rule, substitution]);
return this;
};
/**
* Add a singularization `rule` with the given `substitution`.
*
* @param {RegExp} rule
* @param {String} substitution
* @return {Language} for chaining
* @api public
*/
Language.prototype.singular = function(rule, substitution){
this.rules.singular.unshift([rule, substitution]);
return this;
};
/**
* Pluralize the given `word`.
*
* @param {String} word
* @return {String}
* @api public
*/
Language.prototype.pluralize = function(word){
return this.inflect(word, 'plural');
};
/**
* Check if `word` is plural.
*
* @param {String or Number} word
* @return {Boolean}
* @api public
*/
Language.prototype.isPlural = function (word) {
if ('number' == typeof word) {
return (this.rules.pluralNumbers || /.*/).test(word);
} else {
return word == this.pluralize(this.singularize(word));
}
};
/**
* Singularize the given `word`.
*
* @param {String} word
* @return {String}
* @api public
*/
Language.prototype.singularize = function (word) {
return this.inflect(word, 'singular');
};
/**
* Check if `word` is singular.
*
* @param {String or Number} word
* @return {Boolean}
* @api public
*/
Language.prototype.isSingular = function (word) {
return !this.isPlural(word);
};
/**
* Tableize the given `str`.
*
* Examples:
*
* lingo.tableize('UserAccount');
* // => "user_accounts"
*
* lingo.tableize('User');
* // => "users"
*
* @param {String} str
* @return {String}
* @api public
*/
exports.tableize = function(str){
var underscored = exports.underscore(word);
return Language.pluralize(underscored);
};
/**
* Perform `type` inflection rules on the given `word`.
*
* @param {String} word
* @param {String} type
* @return {String}
* @api private
*/
Language.prototype.inflect = function(word, type) {
if (this.isUncountable(word)) return word;
var irregular = this.rules.irregular[type][word];
if (irregular) return irregular;
for (var i = 0, len = this.rules[type].length; i < len; ++i) {
var rule = this.rules[type][i]
, regexp = rule[0]
, sub = rule[1];
if (regexp.test(word)) {
return word.replace(regexp, sub);
}
}
return word;
}