From e44a7e37b6c7b5961adaffc62b9042b8d442938e Mon Sep 17 00:00:00 2001
From: mensonge
Date: Thu, 13 Nov 2008 09:49:11 +0000
Subject: New feature: basic Ajax suggestion for tags and implementation of
 Dojo toolkit

git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
---
 includes/js/dojox/lang/functional/fold.js | 87 +++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 includes/js/dojox/lang/functional/fold.js

(limited to 'includes/js/dojox/lang/functional/fold.js')

diff --git a/includes/js/dojox/lang/functional/fold.js b/includes/js/dojox/lang/functional/fold.js
new file mode 100644
index 0000000..90a9a3d
--- /dev/null
+++ b/includes/js/dojox/lang/functional/fold.js
@@ -0,0 +1,87 @@
+if(!dojo._hasResource["dojox.lang.functional.fold"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojox.lang.functional.fold"] = true;
+dojo.provide("dojox.lang.functional.fold");
+
+dojo.require("dojox.lang.functional.lambda");
+
+// This module adds high-level functions and related constructs:
+//	- "fold" family of functions
+
+// Notes:
+//	- missing high-level functions are provided with the compatible API: 
+//		foldl, foldl1, foldr, foldr1
+//	- missing JS standard functions are provided with the compatible API: 
+//		reduce, reduceRight
+
+// Defined methods:
+//	- take any valid lambda argument as the functional argument
+//	- operate on dense arrays
+//	- take a string as the array argument
+//	- take an iterator objects as the array argument (only foldl, foldl1, and reduce)
+
+(function(){
+	var d = dojo, df = dojox.lang.functional;
+
+	d.mixin(df, {
+		// classic reduce-class functions
+		foldl: function(/*Array|String|Object*/ a, /*Function*/ f, /*Object*/ z, /*Object?*/ o){
+			// summary: repeatedly applies a binary function to an array from left 
+			//	to right using a seed value as a starting point; returns the final 
+			//	value.
+			if(typeof a == "string"){ a = a.split(""); }
+			o = o || d.global; f = df.lambda(f);
+			if(d.isArray(a)){
+				for(var i = 0, n = a.length; i < n; z = f.call(o, z, a[i], i, a), ++i);
+			}else{
+				for(var i = 0; a.hasNext(); z = f.call(o, z, a.next(), i++));
+			}
+			return z;	// Object
+		},
+		foldl1: function(/*Array|String|Object*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
+			// summary: repeatedly applies a binary function to an array from left 
+			//	to right; returns the final value.
+			if(typeof a == "string"){ a = a.split(""); }
+			o = o || d.global; f = df.lambda(f);
+			var z;
+			if(d.isArray(a)){
+				z = a[0];
+				for(var i = 1, n = a.length; i < n; z = f.call(o, z, a[i], i, a), ++i);
+			}else if(a.hasNext()){
+				z = a.next();
+				for(var i = 1; a.hasNext(); z = f.call(o, z, a.next(), i++));
+			}
+			return z;	// Object
+		},
+		foldr: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object*/ z, /*Object?*/ o){
+			// summary: repeatedly applies a binary function to an array from right
+			//	to left using a seed value as a starting point; returns the final 
+			//	value.
+			if(typeof a == "string"){ a = a.split(""); }
+			o = o || d.global; f = df.lambda(f);
+			for(var i = a.length; i > 0; --i, z = f.call(o, z, a[i], i, a));
+			return z;	// Object
+		},
+		foldr1: function(/*Array|String*/ a, /*Function|String|Array*/ f, /*Object?*/ o){
+			// summary: repeatedly applies a binary function to an array from right
+			//	to left; returns the final value.
+			if(typeof a == "string"){ a = a.split(""); }
+			o = o || d.global; f = df.lambda(f);
+			var n = a.length, z = a[n - 1];
+			for(var i = n - 1; i > 0; --i, z = f.call(o, z, a[i], i, a));
+			return z;	// Object
+		},
+		// JS 1.8 standard array functions, which can take a lambda as a parameter.
+		reduce: function(/*Array|String|Object*/ a, /*Function*/ f, /*Object?*/ z){
+			// summary: apply a function simultaneously against two values of the array 
+			//	(from left-to-right) as to reduce it to a single value.
+			return arguments.length < 3 ? df.foldl1(a, f) : df.foldl(a, f, z);	// Object
+		},
+		reduceRight: function(/*Array|String*/ a, /*Function*/ f, /*Object?*/ z){
+			// summary: apply a function simultaneously against two values of the array 
+			//	(from right-to-left) as to reduce it to a single value.
+			return arguments.length < 3 ? df.foldr1(a, f) : df.foldr(a, f, z);	// Object
+		}
+	});
+})();
+
+}
-- 
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