mambo.core.core source code

1 /**
2  * Copyright: Copyright (c) 2012 Jacob Carlborg. All rights reserved.
3  * Authors: Jacob Carlborg
4  * Version: Initial created: Mar 3, 2012
5  * License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0)
6  */
7 module mambo.core.core;
8 
9 import std.regex;
10 
11 import mambo.core.Array;
12 import mambo.core.AssociativeArray;
13 import mambo.util.Traits;
14 
15 /**
16  * Returns true if the given value is blank. A string is considered blank if any of
17  * the following conditions are true:
18  *
19  * $(UL
20  * 	$(LI The string is null)
21  * 	$(LI The length of the string is equal to 0)
22  * 	$(LI The string only contains blank characters, i.e. space, newline or tab)
23  * )
24  *
25  * Params:
26  *     str = the string to test if it's blank
27  *
28  * Returns: $(D_KEYWORD true) if any of the above conditions are met
29  *
30  * See_Also: isPresent
31  */
32 @property bool isBlank (T) (T t)
33 {
34 	static if (isString!(T))
35 	{
36 		if (t.length == 0)
37 			return true;
38 
39 		return match(t, regex(`\S`, "g")).empty;
40 	}
41 
42 	else static if (__traits(compiles, t.isEmpty))
43 		return t.isEmpty;
44 
45 	else static if (isPrimitive!(T) || isStruct!(T) || isUnion!(T))
46 		return false;
47 
48 	else
49 		return T.init == t;
50 }
51 
52 @property bool isPresent (T) (T t)
53 {
54 	return !isBlank(t);
55 }