Difference between revisions of "Template:Ifnotempty"

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rp>Patrick
(copied from Template:If, to be changed into a version specific to ifnotempty to reduce expansion depth)
 
rp>Patrick
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<includeonly>{{{{{|safesubst:}}}{{{{{|safesubst:}}}#ifeq:{{{1}}}|eq|p1|p2}}|{{{{{|safesubst:}}}{{{{{|safesubst:}}}#ifeq:{{{2}}}|{{{3}}}|p1|p2}}|{{{4|}}}|{{{5|}}}}}|{{{{{|safesubst:}}}{{{{{|safesubst:}}}#switch:{{{{{|safesubst:}}}#if{{{1}}}:{{{2}}}|p1|p2}}|p1=p1|p2={{{{{|safesubst:}}}#ifeq:{{{1}}}|error|{{{{{|safesubst:}}}#ifeq:{{{4|+}}}|{{{4|-}}}|p2|p3}}|p2}}|if/errmsg}}|{{{3}}}|{{{4|}}}|{{{2}}}}}}}</includeonly><noinclude><div class="template-documentation" style="margin-top:1em;">{{#if:defaultnotblank|<div style="padding-bottom:3px; border-bottom:1px solid #aaa; margin-bottom:1ex;">
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<includeonly>{{{{{|safesubst:}}}{{{{{|safesubst:}}}#if:{{{1}}}|p1|p2}}|{{{2}}}|{{{3|}}}}}</includeonly><noinclude><div class="template-documentation" style="margin-top:1em;">{{#if:defaultnotblank|<div style="padding-bottom:3px; border-bottom:1px solid #aaa; margin-bottom:1ex;">
 
<span style="font-size:150%">Documentation</span></div>}}
 
<span style="font-size:150%">Documentation</span></div>}}
 
{{Documentation subpage}}
 
{{Documentation subpage}}
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With this template the parser functions of [[mw:Help:Extension:ParserFunctions|Extension:ParserFunctions]] with names starting with "#if" can be used in a way such that they do not [[Help:Newlines_and_spaces#Stripping_on_expansion|strip spaces and newlines]] from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.
+
With this template [[mw:Help:Extension:ParserFunctions|#if]] can be used in a way such that it does not [[Help:Newlines_and_spaces#Stripping_on_expansion|strip spaces and newlines]] from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.
  
 
==Usage==
 
==Usage==
−
* 4 parameters:
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*<code><nowiki>{{ifnotempty|x| p | q }}</nowiki></code> gives "{{ifnotempty|x| p | q }}"
−
**<code><nowiki>{{if||x| p | q }}</nowiki></code> gives "{{if||x| p | q }}"
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*<code><nowiki>{{ifnotempty|| p | q }}</nowiki></code> gives "{{ifnotempty|| p | q }}"
−
**<code><nowiki>{{if||| p | q }}</nowiki></code> gives "{{if||| p | q }}"
 
−
**<code><nowiki>{{if|expr|2<3| p | q }}</nowiki></code> gives "{{if|expr|2<3| p | q }}"
 
−
**<code><nowiki>{{if|expr|2>3| p | q }}</nowiki></code> gives "{{if|expr|2>3| p | q }}"
 
−
**<code><nowiki>{{if|expr|2{{=}}3| p | q }}</nowiki></code> gives "{{if|expr|2{{=}}3| p | q }}"
 
−
**<code><nowiki>{{if|expr||2=2=3| p | q }}</nowiki></code> gives "{{if|expr||2=2=33| p | q }}"
 
−
**<code><nowiki>{{if|exist| Help:Link | p | q }}</nowiki></code> gives "{{if|exist| Help:Link | p | q }}"
 
−
**<code><nowiki>{{if|exist| Hulp:Link | p | q }}</nowiki></code> gives "{{if|exist| Hulp:Link | p | q }}"
 
−
**<code><nowiki>{{if|error|<span class{{=}}"error">x</span>| p | q }}</nowiki></code> gives "{{if|error|<span class{{=}}"error">x</span>| p | q }}"
 
−
**<code><nowiki>{{if|error| 7 | p | q }}</nowiki></code> gives "{{if|error| 7 | p | q }}"
 
−
**<code><nowiki>{{if|error| 7 | p | }}</nowiki></code> gives "{{if|error| 7 | p | }}"
 
−
**<code><nowiki>{{if|error| 7 | p |}}</nowiki></code> gives "{{if|error| 7 | p |}}"
 
−
**<code><nowiki>{{if|error| 7 | p }}</nowiki></code> gives "{{if|error| 7 | p }}"
 
−
* 5 parameters:
 
−
**<code><nowiki>{{if|eq| u |u| p | q }}</nowiki></code> gives "{{if|eq| u |u| p | q }}"
 
−
**<code><nowiki>{{if|eq| u |v| p | q }}</nowiki></code> gives "{{if|eq| u |v| p | q }}"
 
−
 
 
 
Compare:
 
Compare:
−
* 3 parameters:
+
*<code><nowiki>{{#if:x| p | q }}</nowiki></code> gives "{{#if:x| p | q }}"
−
**<code><nowiki>{{#if:x| p | q }}</nowiki></code> gives "{{#if:x| p | q }}"
 
−
**<code><nowiki>{{#ifexpr:2<3| p | q }}</nowiki></code> gives "{{#ifexpr:2<3| p | q }}"
 
−
**<code><nowiki>{{#ifexist: Help:Link | p | q }}</nowiki></code> gives "{{#ifexist: Help:Link | p | q }}"
 
−
**<code><nowiki>{{#iferror:<span class="error">x</span>| p | q }}</nowiki></code> gives "{{#iferror:<span class="error">x</span>| p | q }}"
 
−
**<code><nowiki>{{#iferror: 7 | p | q }}</nowiki></code> gives "{{#iferror: 7 | p | q }}"
 
−
**<code><nowiki>{{#iferror: 7 | p | }}</nowiki></code> gives "{{#iferror: 7 | p | }}"
 
−
**<code><nowiki>{{#iferror: 7 | p |}}</nowiki></code> gives "{{#iferror: 7 | p |}}"
 
−
**<code><nowiki>{{#iferror: 7 | p }}</nowiki></code> gives "{{#iferror: 7 | p }}"
 
−
* 4 parameters:
 
−
**<code><nowiki>{{#ifeq: u |u| p | q }}</nowiki></code> gives "{{#ifeq: u |u| p | q }}"
 
−
 
 
 
Note that, unlike parser functions, templates require writing equals signs in values of unnamed parameters as <code><nowiki>{{=}}</nowiki></code>
 
Note that, unlike parser functions, templates require writing equals signs in values of unnamed parameters as <code><nowiki>{{=}}</nowiki></code>
  
 
For full substitution, simply use {{cnw|subst:}} or {{cnw|safesubst:}}. If the condition contains a parser function, template, or variable, that should be substituted too. Optionally the "then" or "else" part can also be substituted.
 
For full substitution, simply use {{cnw|subst:}} or {{cnw|safesubst:}}. If the condition contains a parser function, template, or variable, that should be substituted too. Optionally the "then" or "else" part can also be substituted.
−
 
−
Error messages (examples):
 
−
 
−
*<code><nowiki>{{if|expr|1234>e3|1|0}}</nowiki></code> gives {{if|expr|1234>e3|1|0}}
 
−
*<code><nowiki>{{#ifexpr:1234>e3|1|0}}</nowiki></code> gives {{#ifexpr:1234>e3|1|0}}
 
  
 
==Expansion depth limit==
 
==Expansion depth limit==
Line 69: Line 37:
  
 
Condition: string not empty.
 
Condition: string not empty.
−
 
−
===#ifexist:===
 
−
 
−
Condition: page [[Help:Page existence|exists]] (applies also to special pages).
 
−
 
−
The usual case-sensitivity applies: if a page exists then also a non-canonical name for that page gives a positive result.
 
−
 
−
[[Template:Exists]] gives the same result, except that the result is positive for an interwiki link. You can also handle an interwiki link differently with [[Template:If interwiki link]].
 
−
 
−
The page A checking existence of page B is listed on Special:Whatlinkshere/B as a page which links to B.
 
−
 
−
On Wikimedia wikis there is a maximum for the number of distinct pages for which #ifexist is called on a page. A call of #ifexist after a transclusion of the same page does not require an extra database query and is therefore not counted. A call beyond the maximum returns "false". The html-source of each page shows the counted number of calls, as well as the maximum. The maximum is currently 500, see [[w:Wikipedia:Template limits#Expensive parser function calls]].
 
−
 
−
===#ifexpr:===
 
−
Condition: non-zero.<ref>[http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/ParserFunctions/Expr.php?view=markup Expr.php]</ref>
 
−
 
−
Empty gives false. Other strings which are not correct numerical or Boolean expressions give an error message<ref>[http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/ParserFunctions/ParserFunctions.i18n.php?view=markup ParserFunctions.i18n.php]</ref>:
 
−
<pre>
 
−
16 'pfunc_expr_stack_exhausted' => 'Expression error: Stack exhausted',
 
−
17 'pfunc_expr_unexpected_number' => 'Expression error: Unexpected number',
 
−
18 'pfunc_expr_preg_match_failure' => 'Expression error: Unexpected preg_match failure',
 
−
19 'pfunc_expr_unrecognised_word' => 'Expression error: Unrecognised word "$1"',
 
−
20 'pfunc_expr_unexpected_operator' => 'Expression error: Unexpected $1 operator',
 
−
21 'pfunc_expr_missing_operand' => 'Expression error: Missing operand for $1',
 
−
22 'pfunc_expr_unexpected_closing_bracket' => 'Expression error: Unexpected closing bracket',
 
−
23 'pfunc_expr_unrecognised_punctuation' => 'Expression error: Unrecognised punctuation character "$1"',
 
−
24 'pfunc_expr_unclosed_bracket' => 'Expression error: Unclosed bracket',
 
−
25 'pfunc_expr_division_by_zero' => 'Division by zero',
 
−
26 'pfunc_expr_invalid_argument' => 'Invalid argument for $1: < -1 or > 1',
 
−
27 'pfunc_expr_invalid_argument_ln' => 'Invalid argument for ln: <= 0',
 
−
28 'pfunc_expr_unknown_error' => 'Expression error: Unknown error ($1)',
 
−
29 'pfunc_expr_not_a_number' => 'In $1: result is not a number',
 
−
</pre>
 
−
 
−
===#iferror:===
 
−
 
−
Condition: contains <code>class="error"</code> as attribute of <code><nowiki><strong></nowiki></code>, <code><nowiki><span></nowiki></code>, <code><nowiki><p></nowiki></code>, or <code><nowiki><div></nowiki></code> tags.<ref>[http://svn.wikimedia.org/viewvc/mediawiki/trunk/extensions/ParserFunctions/ParserFunctions_body.php?view=markup ParserFunctions_body.php]</ref>
 
−
 
−
These are generated by #expr, #ifexpr, #time, #rel2abs, some other MediaWiki situations (such as recursive depth and template loop checks), and this template.
 
−
 
−
If the error condition does not apply and there is no "else" part, the function gives the input wikitext.
 
−
 
−
===#ifeq:===
 
−
Condition: equal as strings (case-sensitive) or numbers.<ref>#ifeq: uses the PHP comparison operator ==.[http://www.php.net/manual/en/language.operators.comparison.php]</ref>
 
−
 
−
*<code><nowiki>{{if|eq| 1e3 | 1000 | 1 | 0 }}</nowiki></code> gives "{{if|eq| 1e3 | 1000 | 1 | 0 }}".
 
−
*<code><nowiki>{{#ifeq: 1e3 | 1000 | 1 | 0 }}</nowiki></code> gives "{{#ifeq: 1e3 | 1000 | 1 | 0 }}".
 
−
 
−
To force a string-based comparison, add a non-numerical character to both compared arguments.
 
−
 
−
*<code><nowiki>{{if|eq| x1e3 | x1000 | 1 | 0 }}</nowiki></code> gives "{{if|eq| x1e3 | x1000 | 1 | 0 }}".
 
−
*<code><nowiki>{{#ifeq: x1e3 | x1000 | 1 | 0 }}</nowiki></code> gives "{{#ifeq: x1e3 | x1000 | 1 | 0 }}".
 
−
 
−
If desired, trim the arguments before adding this non-numerical character, for example with <code><nowiki>{{#if:x|..}}</nowiki></code>.
 
−
 
−
Text between <code>&lt;nowiki&gt;</code> tags is temporarily replaced by a unique code. This affects comparisons:
 
−
 
−
*<code><nowiki>{{if|eq|&lt;nowiki&gt;abc&lt;/nowiki&gt; | &lt;nowiki&gt;abc&lt;/nowiki&gt; | 1 | 0 }}</nowiki></code> gives "{{if|eq|<nowiki>abc</nowiki> | <nowiki>abc</nowiki> | 1 | 0 }}".
 
−
*<code><nowiki>{{#ifeq:&lt;nowiki&gt;abc&lt;/nowiki&gt; | &lt;nowiki&gt;abc&lt;/nowiki&gt; | 1 | 0 }}</nowiki></code> gives "{{#ifeq:<nowiki>abc</nowiki> | <nowiki>abc</nowiki> | 1 | 0 }}".
 
  
 
==See also==
 
==See also==
−
*[[Template:Sw]]
+
*[[Template:If]]
−
*[[Template:Iflenge]]
 
−
*[[w:Template:If]]
 
 
{{refs}}
 
{{refs}}
  
 
<div style="clear:both;" /></div></div></noinclude>
 
<div style="clear:both;" /></div></div></noinclude>

Revision as of 11:54, 27 July 2010

Documentation

Script error: No such module "Template translation". With this template #if can be used in a way such that it does not strip spaces and newlines from the "then" and "else" part. For evaluating the condition spaces and newlines are stripped like with ParserFunctions.

Usage

  • {{ifnotempty|x| p | q }} gives " p "
  • {{ifnotempty|| p | q }} gives " q "

Compare:

  • {{#if:x| p | q }} gives "p"

Note that, unlike parser functions, templates require writing equals signs in values of unnamed parameters as {{=}}

For full substitution, simply use Template:Cnw or Template:Cnw. If the condition contains a parser function, template, or variable, that should be substituted too. Optionally the "then" or "else" part can also be substituted.

Expansion depth limit

7 levels allowed:

{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|a}}}}}}}}}}}}}} gives Template:If

{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|{{if||x|a}}}}}}}}}}}}}}}} gives Template:If

{{if||||{{if||||{{if||||{{if||||{{if||||{{if||||{{if||||a}}}}}}}}}}}}}} gives Template:If

{{if||||{{if||||{{if||||{{if||||{{if||||{{if||||{{if||||{{if||||a}}}}}}}}}}}}}}}} gives Template:If

{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|a}}}}}}}}}}}}}} gives Template:If

{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|{{if|expr|1|a}}}}}}}}}}}}}}}} gives Template:If

To allow more levels there is a separate Template:Ifexpr.

Internal technical details

For evaluating the condition the template uses the actual parser functions; however, not directly with p and q, because this strips spaces and newlines from them, but with index values 1 and 2. The result can be 1, 2, or, only in the case of #ifexpr, an error message. Using a switch these are converted to p1, p2, and if/errmsg, respectively. The template with the applicable name is called (Template:P1, Template:P2, or Template:If/errmsg), with as parameters p, q, and {{{2}}}. Templates p1 and p2 ignore {{{2}}}; template if/errmsg is only called in the case of #ifexpr, in the case of a wrong expression {{{2}}}; it ignores p and q and uses {{{2}}} for display in the error message.

Conditions

#if:

Condition: string not empty.

See also

Retrieved from "https://wiki.everp.online/index.php?title=Template:Ifnotempty&oldid=200340"