1 /*
  2  * ctype.islpha.js - Character type is alphabetic
  3  *
  4  * Copyright © 2012-2015, 2018, JEDLSoft
  5  *
  6  * Licensed under the Apache License, Version 2.0 (the "License");
  7  * you may not use this file except in compliance with the License.
  8  * You may obtain a copy of the License at
  9  *
 10  *     http://www.apache.org/licenses/LICENSE-2.0
 11  *
 12  * Unless required by applicable law or agreed to in writing, software
 13  * distributed under the License is distributed on an "AS IS" BASIS,
 14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 15  *
 16  * See the License for the specific language governing permissions and
 17  * limitations under the License.
 18  */
 19 
 20 // !data ctype_l
 21 
 22 var ilib = require("./ilib.js");
 23 var CType = require("./CType.js");
 24 var IString = require("./IString.js");
 25 
 26 /**
 27  * Return whether or not the first character is alphabetic.<p>
 28  *
 29  * @static
 30  * @param {string|IString|number} ch character or code point to examine
 31  * @return {boolean} true if the first character is alphabetic.
 32  */
 33 var isAlpha = function (ch) {
 34     var num;
 35     switch (typeof(ch)) {
 36         case 'number':
 37             num = ch;
 38             break;
 39         case 'string':
 40             num = IString.toCodePoint(ch, 0);
 41             break;
 42         case 'undefined':
 43             return false;
 44         default:
 45             num = ch._toCodePoint(0);
 46             break;
 47     }
 48     return ilib.data.ctype_l ?
 49         (CType._inRange(num, 'Lu', ilib.data.ctype_l) ||
 50         CType._inRange(num, 'Ll', ilib.data.ctype_l) ||
 51         CType._inRange(num, 'Lt', ilib.data.ctype_l) ||
 52         CType._inRange(num, 'Lm', ilib.data.ctype_l) ||
 53         CType._inRange(num, 'Lo', ilib.data.ctype_l)) :
 54         ((num >= 0x41 && num <= 0x5A) || (num >= 0x61 && num <= 0x7A));
 55 };
 56 
 57 /**
 58  * @protected
 59  * @param {boolean} sync
 60  * @param {Object|undefined} loadParams
 61  * @param {function(*)|undefined} onLoad
 62  */
 63 isAlpha._init = function (sync, loadParams, onLoad) {
 64     CType._load("ctype_l", sync, loadParams, onLoad);
 65 };
 66 
 67 module.exports = isAlpha;