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47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
dojo.provide("dojox.lang.functional.util");
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dojo.require("dojox.lang.functional.lambda");
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// This module provides helpers:
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// - inlining string lambda functions.
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(function(){
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var df = dojox.lang.functional;
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dojo.mixin(df, {
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inlineLambda: function(/*String*/ lambda, /*String|Array*/ init, /*Function?*/ add2dict){
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// summary:
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// Creates the inlined version of a string lambda.
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// lambda:
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// The String variable representing the lambda function.
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// init:
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// Conveys how to initialize parameters. If it is a String, then the apply() method
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// would be emulated treating "init" as a list of input parameters.
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// It it is an Array, then the call() method is emulated treating array members
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// as input parameters.
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// add2dict:
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// The optional function, which is used to record names of lambda parameters.
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// If supplied, this function is called with a name of every parameter.
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var s = df.rawLambda(lambda);
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if(add2dict){
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df.forEach(s.args, add2dict);
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}
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var ap = typeof init == "string", // apply or call?
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n = ap ? s.args.length : Math.min(s.args.length, init.length),
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a = new Array(4 * n + 4), i, j = 1;
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for(i = 0; i < n; ++i){
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a[j++] = s.args[i];
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a[j++] = "=";
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a[j++] = ap ? init + "[" + i + "]": init[i];
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a[j++] = ",";
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}
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a[0] = "(";
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a[j++] = "(";
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a[j++] = s.body;
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a[j] = "))";
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return a.join(""); // String
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}
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});
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})();
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