Difference between revisions of "IF Directive"
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==Purpose== | ==Purpose== | ||
Compiler directives to allow inclusion or exclusion of source code based on a condition | Compiler directives to allow inclusion or exclusion of source code based on a condition | ||
| Line 17: | Line 10: | ||
[#ELIF <expN2> | <expL2> | [#ELIF <expN2> | <expL2> | ||
| − | <statements2> | + | <statements2>... |
#ELIF <expNN> | <expLN> | #ELIF <expNN> | <expLN> | ||
| Line 31: | Line 24: | ||
==See Also== | ==See Also== | ||
| − | [[COMPILE]], [[DEFINE|#DEFINE]], [[DO]], [[DO CASE]], [[IF]], [[IFDEF|#IFDEF]], [[INCLUDE|#INCLUDE]], [[ | + | [[COMPILE]], [[DEFINE|#DEFINE]], [[DO]], [[DO CASE]], [[IF]], [[IFDEF|#IFDEF]], [[INCLUDE|#INCLUDE]], [[SET COMPILE]], [[SET DEVELOPMENT]], [[UNDEF|#UNDEF]] |
==Description== | ==Description== | ||
| − | The #IF compiler directive can be used to allow inclusion or exclusion of source code based on a condition. The condition can be a numeric expression, <expN1> or any valid expression evaluating to a logical true (.T.) or false (.F.), <expL1>, and is evaluated at compile time. If the <expL1> evaluates to true or the <expN1> evaluates to a nonzero value, the <statements1> that follow are included in the compiled program file and the compilation continues after the #ENDIF. The <statements1> can be any valid Recital 4GL commands. If the <expL1> evaluates to false or the <expN1> evaluates to zero, the <statements1> are excluded and any included #ELIF directives are evaluated in turn in a similar way. If a #ELIF condition evaluates to a non-zero value or to true, the statements that immediately follow are included in the compiled program file and the compilation continues after the #ENDIF. If no #ELIF directives are specified, or if they all evaluate to zero or to false, a check is made for a #ELSE directive and its <statements_else> included in the compiled file if it exists. | + | The #IF compiler directive can be used to allow inclusion or exclusion of source code based on a condition. The condition can be a numeric expression, <expN1>, or any valid expression evaluating to a logical true (.T.) or false (.F.), <expL1>, and is evaluated at compile time. If the <expL1> evaluates to true or the <expN1> evaluates to a nonzero value, the <statements1> that follow are included in the compiled program file and the compilation continues after the #ENDIF. The <statements1> can be any valid Recital 4GL commands. If the <expL1> evaluates to false or the <expN1> evaluates to zero, the <statements1> are excluded and any included #ELIF directives are evaluated in turn in a similar way. If a #ELIF condition evaluates to a non-zero value or to true, the statements that immediately follow are included in the compiled program file and the compilation continues after the #ENDIF. If no #ELIF directives are specified, or if they all evaluate to zero or to false, a check is made for a #ELSE directive and its <statements_else> included in the compiled file if it exists. |
This directive can only be used in compiled programs. | This directive can only be used in compiled programs. | ||
| Line 43: | Line 36: | ||
<code lang="recital"> | <code lang="recital"> | ||
#IF OS() = "Windows Servers" | #IF OS() = "Windows Servers" | ||
| − | + | dirterm = "\" | |
#ELIF OS() = "Linux Servers" | #ELIF OS() = "Linux Servers" | ||
| − | + | dirterm = "/" | |
| − | + | set filecase on | |
#ELIF OS() = "OpenVMS Servers" | #ELIF OS() = "OpenVMS Servers" | ||
| − | + | dirterm = "]" | |
#ELSE | #ELSE | ||
| − | + | dirterm = "/" | |
| − | + | set filecase on | |
#ENDIF | #ENDIF | ||
</code> | </code> | ||
| Line 57: | Line 50: | ||
==Products== | ==Products== | ||
| − | Recital | + | Recital Server, Recital |
[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Commands]] | [[Category:Commands]] | ||
| + | [[Category:Applications]] | ||
| + | [[Category:Applications Commands]] | ||
Latest revision as of 16:56, 11 November 2009
Purpose
Compiler directives to allow inclusion or exclusion of source code based on a condition
Syntax
#IF <expN1> | <expL1>
<statements1>
[#ELIF <expN2> | <expL2>
<statements2>...
#ELIF <expNN> | <expLN>
<statementsN>]
[#ELSE
<statements_else>]
#ENDIF
See Also
COMPILE, #DEFINE, DO, DO CASE, IF, #IFDEF, #INCLUDE, SET COMPILE, SET DEVELOPMENT, #UNDEF
Description
The #IF compiler directive can be used to allow inclusion or exclusion of source code based on a condition. The condition can be a numeric expression, <expN1>, or any valid expression evaluating to a logical true (.T.) or false (.F.), <expL1>, and is evaluated at compile time. If the <expL1> evaluates to true or the <expN1> evaluates to a nonzero value, the <statements1> that follow are included in the compiled program file and the compilation continues after the #ENDIF. The <statements1> can be any valid Recital 4GL commands. If the <expL1> evaluates to false or the <expN1> evaluates to zero, the <statements1> are excluded and any included #ELIF directives are evaluated in turn in a similar way. If a #ELIF condition evaluates to a non-zero value or to true, the statements that immediately follow are included in the compiled program file and the compilation continues after the #ENDIF. If no #ELIF directives are specified, or if they all evaluate to zero or to false, a check is made for a #ELSE directive and its <statements_else> included in the compiled file if it exists.
This directive can only be used in compiled programs.
Example
#IF OS() = "Windows Servers" dirterm = "\" #ELIF OS() = "Linux Servers" dirterm = "/" set filecase on #ELIF OS() = "OpenVMS Servers" dirterm = "]" #ELSE dirterm = "/" set filecase on #ENDIF
Products
Recital Server, Recital
