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/*
* Module : utils.js
* Copyright : (c) 2011-2012, Galois, Inc.
*
* Maintainer :
* Stability : Provisional
* Portability: Portable
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var fiveui = fiveui || {};
(function() {
fiveui.utils = fiveui.utils || {};
/**
* Chooses a function based on the current browser.
*/
fiveui.utils.pick = function (mozFn, chrFn) {
if (typeof chrome != 'undefined' ) {
return chrFn;
} else {
return mozFn;
}
};
/**
* Create a browser-independent settings object. This uses different
* backing storage depending on the browser:
*
* - Firefox: simple-storage
* - Chrome: localStorage
*
* @return {!fiveui.Settings} A settings object that will persist data
* between browser invocations.
*/
// fiveui.utils.getSettings = fiveui.utils.pick(
// function() {
// // var ss = require('simple-storage');
// var ss = {storage: {}}; // XXX hack, obviously.
// var storageWrapper = new fiveui.utils.StorageWrapper(ss.storage);
// return new fiveui.Settings(storageWrapper);
// },
// function() {
// return new fiveui.Settings(localStorage);
// });
/**
* Get an ID by adding one to the max id in current use.
*
* @param {Array.<number>} list the list of ids that the new id must
* not conflict with.
* @return {!number} A unique id for UrlPats.
*/
fiveui.utils.getNewId = function(list) {
// make sure we have a non-null, non-empty list:
if (list === null || list.length == 0) {
return 0;
} else {
return 1 + Math.max.apply(Math, list);
}
};
/**
* Create a regular expression from a globbed pattern.
*
* @param {!string} str The globbed url.
* @return {!RegExp} A compiled regular expression.
*/
fiveui.utils.compilePattern = function(str) {
var regex = str.replace(/\./g, '\.')
.replace(/\*/g, '.*');
return new RegExp(regex);
};
/**
* Remove c-style comments
*
* There's probably a faster way to do this.
*/
var removeComments = function(data) {
var state = 0;
var toEOL = 1;
var toEOC = 2;
var inQUOTE = 3;
var inDQUOTE = 4;
var sanitized = '';
var len = data.length;
var s = 0, e = 0;
for(; e < len; ++e) {
switch(state) {
case toEOL:
if(data[e] == '\n') {
state = 0;
s = e + 1;
}
break;
case toEOC:
if(data[e] == '*' && data[e+1] == '/') {
state = 0;
s = e + 2;
e = e + 1;
}
break;
case inQUOTE:
if(data[e] == '\'') {
state = 0;
}
break;
case inDQUOTE:
if(data[e] == '"') {
state = 0;
}
break;
default:
if(data[e] == '\'') {
state = inQUOTE;
} else if(data[e] == '"') {
state = inDQUOTE;
} else if(data[e] == '/') {
if(data[e+1] == '/') {
sanitized = sanitized + data.substring(s,e);
state = toEOL;
e = e + 1;
} else if(data[e+1] == '*') {
sanitized = sanitized + data.substring(s,e);
state = toEOC;
e = e + 1;
}
}
break;
}
}
if(state == 0 && s < e) {
sanitized = sanitized + data.substring(s,e);
}
return sanitized;
};
/**
* Filter out comments, and other things that aren't appropriate in JSON.
*/
fiveui.utils.filterJSON = function(data, type) {
if(type == 'json') {
return removeComments(data);
} else {
return data;
}
};
})();
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