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backend/node_modules/thenby/thenBy.module.js

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+/***
+   Copyright 2013 Teun Duynstee
+
+   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.
+*/
+module.exports = (function() {
+
+    function identity(v){return v;}
+
+    function ignoreCase(v){return typeof(v)==="string" ? v.toLowerCase() : v;}
+
+    function makeCompareFunction(f, opt){
+        opt = typeof(opt)==="object" ? opt : {direction:opt};
+        
+        if(typeof(f)!="function"){
+            var prop = f;
+            // make unary function
+            f = function(v1){return !!v1[prop] ? v1[prop] : "";}
+        }
+        if(f.length === 1) {
+            // f is a unary function mapping a single item to its sort score
+            var uf = f;
+            var preprocess = opt.ignoreCase?ignoreCase:identity;
+            var cmp = opt.cmp || function(v1,v2) {return v1 < v2 ? -1 : v1 > v2 ? 1 : 0;}
+            f = function(v1,v2) {return cmp(preprocess(uf(v1)), preprocess(uf(v2)));}
+        }
+        const descTokens = {"-1":'', desc:''};
+        if(opt.direction in descTokens) return function(v1,v2){return -f(v1,v2)};
+        return f;
+    }
+
+    /* adds a secondary compare function to the target function (`this` context)
+       which is applied in case the first one returns 0 (equal)
+       returns a new compare function, which has a `thenBy` method as well */
+    function tb(func, opt) {
+        /* should get value false for the first call. This can be done by calling the 
+        exported function, or the firstBy property on it (for es6 module compatibility)
+        */
+        var x = (typeof(this) == "function" && !this.firstBy) ? this : false;
+        var y = makeCompareFunction(func, opt);
+        var f = x ? function(a, b) {
+                        return x(a,b) || y(a,b);
+                    }
+                  : y;
+        f.thenBy = tb;
+        return f;
+    }
+    tb.firstBy = tb;
+    return tb;
+})();