source: Dev/trunk/src/client/dojox/lang/functional/util.js @ 483

dojo.provide("dojox.lang.functional.util");

dojo.require("dojox.lang.functional.lambda");

// This module provides helpers:
//      - inlining string lambda functions.

(function(){
        var df = dojox.lang.functional;

        dojo.mixin(df, {
                inlineLambda: function(/*String*/ lambda, /*String|Array*/ init, /*Function?*/ add2dict){
                        // summary:
                        //              Creates the inlined version of a string lambda.
                        // lambda:
                        //              The String variable representing the lambda function.
                        // init:
                        //              Conveys how to initialize parameters. If it is a String, then the apply() method
                        //              would be emulated treating "init" as a list of input parameters.
                        //              It it is an Array, then the call() method is emulated treating array members
                        //              as input parameters.
                        // add2dict:
                        //              The optional function, which is used to record names of lambda parameters.
                        //              If supplied, this function is called with a name of every parameter.

                        var s = df.rawLambda(lambda);
                        if(add2dict){
                                df.forEach(s.args, add2dict);
                        }
                        var ap = typeof init == "string",       // apply or call?
                                n = ap ? s.args.length : Math.min(s.args.length, init.length),
                                a = new Array(4 * n + 4), i, j = 1;
                        for(i = 0; i < n; ++i){
                                a[j++] = s.args[i];
                                a[j++] = "=";
                                a[j++] = ap ? init + "[" + i + "]": init[i];
                                a[j++] = ",";
                        }
                        a[0] = "(";
                        a[j++] = "(";
                        a[j++] = s.body;
                        a[j] = "))";
                        return a.join("");      // String
                }
        });
})();