Abbreviation for command line parameters in node.js

na-sample.js

// Example code for node-abbrev
var abbrevlib = require("node-abbrev");
var sys = require("sys");

// valid run modes for the imaginary tool
var validModes = ["help", "start", "stop", "status"];

// create Abbreviate instance for the modes
// second parameter (case sensitivity) optional, defaults to false
var abbrev = new abbrevlib.Abbreviate(validModes);

// .expand() the first command line parameter
var choice = abbrev.expand(process.argv[2]);
if (!choice.length) {
        // the given parameter did not match anything
        // expanding an empty string will return all modes
        console.log('Please provide a valid mode (' + abbrev.expand('').join(', ') + ').');
} else if (choice.length == 1) {
        console.log('Active mode: ' + choice[0]);
} else {
        console.log('Mode parameter was ambiguous, matches: ' + choice.join(', '));
}

node-abbrev.js

/*
 * Abbreviation lookup helper for small amounts of terms.
 * Inspired by http://search.cpan.org/~pinyan/Text-Abbreviate-0.01/
 *
 * @version 0.1.0
 * @author Frank Grimm (http://frankgrimm.net)
 *
*/

/*

// Example for node-abbrev:
var sys = require("sys");
var abbrevlib = require("node-abbrev");
var abbrev = new abbrevlib.Abbreviate(["help", "start", "stop"], false);

console.log(sys.inspect(abbrev.expand("he")));          // [ 'help' ]
console.log(sys.inspect(abbrev.expand("start")));       // [ 'start' ]
console.log(sys.inspect(abbrev.expand("started")));     // []
console.log(sys.inspect(abbrev.expand("st")));          // [ 'start', 'stop' ]
console.log(sys.inspect(abbrev.expand("")));            // [ 'help', 'start', 'stop' ]

*/

var Abbreviate = function(wordList, actCaseSensitive) {
        var wordList = wordList || [];
        var caseSensitive = actCaseSensitive || false;

        this.__defineGetter__("caseSensitive", function(){
                return caseSensitive;
        });

        this.__defineSetter__("caseSensitive", function(val){
                caseSensitive = val;
        });

        this.containsWord = function(theWord) {
                return this.wordList.some(function(element) {
                                        // oder function(element, index, array) {}
                        return this.caseSensitive ? element == theWord : element.toLowerCase() == theWord.toLowerCase();
                        // theWord.toLowerCase could most likely be done upfront
                });
        }

        this.addWord = function(theWord) {
                if (!containsWord(theWord))
                        wordList.push(theWord);
        }

        this.expand = function(lookupWord) {
                var testRegExp = new RegExp("^" + lookupWord, "");
                testRegExp.ignoreCase = this.caseSensitive;

                return wordList.filter(function(currentWord) {
                                return currentWord.match(testRegExp);
                        });
        }
}

exports.Abbreviate = Abbreviate;