ConditionalExtensions
Question answered by this recipe
I've found the ConditionalMarkup very powerful, but how do I handle more complex expressions involving string/number comparisons, pattern/pagename matching and/or several simultaneous conditions ?
Description
Download extendcond.phpΔ, save it in the cookbook directory and add:
include_once("$FarmD/cookbook/extendcond.php");
to your local configuration file.
Notes
The recipe script provides extras conditional markup verbs to handle regular boolean expressions and string/number comparisons.
String/Number comparisons
(:if eq VALUE1 VALUE2:) (:if lt VALUE1 VALUE2:) (:if le VALUE1 VALUE2:) (:if gt VALUE1 VALUE2:) (:if ge VALUE1 VALUE2:)  All these conditions compares two string/number values.
They may be either literal or variable values as in: 
Strings containing spaces may be enclosed between quotes.
condition  meaning 

eq  synonym for equal 
lt  less than 
le  less or equal than 
gt  greater than 
ge  greater or equal than 
All these condition verbs may be given with a trailing 'i
' as in eqi
, lti
,... to do caseinsensitives comparisons.
Pattern/Pagename matching
(:if regmatch REG_EXPRESSION VALUE:)
 True if the value matches the regular expression. 
(:if matchname NAME_SPEC PAGENAME:)
 True if the given pagename/groupname match the wildcard placeholder specification. 
(:if matchgroup GROUP_SPEC GROUPNAME:)

Boolean expressions
The boolean expressions extension defined by this recipe has been integrated into PmWiki core since v2.1.0beta33: The previously related recipe code part has been dropped.
Following forms are equivalents:
(:if expr BOOLEAN_EXPRESSION :) (:if [ BOOLEAN_EXPRESSION ] :) (:if ( BOOLEAN_EXPRESSION ) :)
The "expr
" condition take subconditions expressions combined with regular PHP boolean operators and brackets, and let PHP evaluate them to get the result.
Example  Name  Result 

A and B  And  TRUE if both A and B are TRUE. 
A or B  Or  TRUE if either A or B is TRUE. 
A xor B  Xor  TRUE if either A or B is TRUE, but not both. 
! A  Not  TRUE if A is not TRUE. 
A && B  And  TRUE if both A and B are TRUE. 
A  B  Or  TRUE if either A or B is TRUE. 
With A and B being either regular conditions (see ConditionalMarkup) or bracketed boolean expressions of regular conditions.
Warnings
 Spaces around operators and brackets are required.
 No specific feedback is given for syntaxic errors or unbalanced brackets.
Sample
With the code below:
(:if expr auth admin  auth attr  auth edit :) [[Logout > {$Name}?action=logout]] %green%{$Author}%% (:if:)
you get a logout link followed by the current author name available only when authentified with higher than 'read' right.
Contributors
See Also
Release Notes
 20050228 Initial proofofconcept release.
 20050420 Updated to a more reliable/usual syntax.
 20050503 Following a Pm's suggestion, spaces around operators are now mandatory to allow exclamation marks and parenthesis in regular conditions terms.
 20050914 Removed extraneous undocumented "Properties" features to its own recipe.
 20050919 Fixed a security issue (thanks to Pm and M.Fick). Added alternates syntax forms and equality condition.
 20060302 Revamped equality condition to more general string/numbers comparisons. Updated licensing terms.
 20060620 Added partial string matches with regular expressions.
 20061028 Added RecipeInfo data. Added pagename wildcard matching.
 20150217 Dropped obsolete code interfering with PHP5.5 compatibility
Sandbox
Some boolean tables:
A  B  C  A or ( B and C )  A and ( ! B or C ) 

F  F  F  F  F 
F  F  T  F  F 
F  T  F  F  F 
F  T  T  T  F 
T  F  F  T  T 
T  F  T  T  T 
T  T  F  T  F 
T  T  T  T  T 
A  B  ( A && ! B )  ( ! A && B )  A xor B 

F  F  F  F 
F  T  T  T 
T  F  T  T 
T  T  F  F 
Comments
See discussion at ConditionalExtensionsTalk
User notes? : If you use, used or reviewed this recipe, you can add your name. These statistics appear in the Cookbook listings and will help newcomers browsing through the wiki.