Difference between revisions of "Template:For loop/doc"
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{{Documentation subpage}} | {{Documentation subpage}} | ||
| − | {{high use|35,000}} | + | {{high-use|35,000}} |
| − | <!-- | + | <!-- Please add categories at the bottom of this page, and interwikis at Wikidata (see Wikipedia:Wikidata) --> |
| + | |||
{{lua|Module:For loop}} | {{lua|Module:For loop}} | ||
| − | + | This template implements a [[for loop]] or a [[foreach loop]]. | |
| − | This template calls a user-specified template (the "called template") once for each value in either 1) an iterated sequence or 2) an explicit list. | + | This template calls a user-specified template (the "called template") multiple times: once for each value in either 1) an iterated sequence or 2) an explicit list. Each value in the sequence or list is passed to the same specified parameter of the called template (the "variable parameter"). Optionally, pre- and postfixes can be attached to the passed values. |
| + | |||
| + | In addition to the specified variable parameter, other parameters of the called template ("static parameters") can be given a value which is the same in each iteration. | ||
== Usage == | == Usage == | ||
{| class="wikitable" | {| class="wikitable" | ||
| − | ! Parameter !! | + | ! Group !! Parameter !! Meaning !! Default value |
|- | |- | ||
| − | | '''1 (unnamed)''' || separator to output between calls (whitespace is preserved) || | + | ! scope=row rowspan=3 | Mandatory |
| + | | '''1 (unnamed)''' || separator to output between calls (may be blank; whitespace is preserved) || | ||
|- | |- | ||
| − | | '''call''' || template to call || | + | | '''call''' || template to call || |
|- | |- | ||
| − | | '''pv''' || name of the variable parameter | + | | '''pv''' || name (or number) of the variable parameter of the called template || style="text-align: center" | 1 |
| + | |- style="border-top: 3px solid grey;" | ||
| + | ! scope=row rowspan=3 | Option 1:<br/>iterated sequence | ||
| + | | '''start''' || first numeric value to pass to variable parameter || style="text-align: center" | 1 | ||
|- | |- | ||
| − | | ''' | + | | '''stop''' || maximum numeric value for variable parameter || |
|- | |- | ||
| − | | ''' | + | | '''by''' || iteration step size between values passed to variable parameter || style="text-align: center" | 1 |
| − | |- | + | |- style="border-top: 3px solid grey;" |
| − | | ''' | + | ! scope=row rowspan=2 | Option 2:<br/>explicit values |
| + | | '''(unnamed parameters)''' || | explicit values, given as separate parameters (whitespace is stripped) || | ||
|- | |- | ||
| − | | ''' | + | | '''skipBlanks''' || set to "true" to skip empty parameter values || style="text-align: center" | false |
| − | |||
| − | |||
|- style="border-top: 3px solid grey;" | |- style="border-top: 3px solid grey;" | ||
| − | | ''' | + | ! scope=row rowspan=5 | Other optional<br/>parameters |
| + | | '''pc[N]n''' || name (or number) of the Nth static parameter of the called template || | ||
|- | |- | ||
| − | | ''' | + | | '''pc[N]v''' || value for the Nth static parameter of the called template || |
|- | |- | ||
| − | | ''' | + | | '''prefix''' || static prefix prepended to each value passed to the variable parameter || |
| − | | | ||
| − | | | ||
|- | |- | ||
| − | | ''' | + | | '''postfix''' || static postfix appended to each value passed to the variable parameter || |
| + | |- | ||
| + | | '''substall''' || set to "false" to not substitute the called template when {{tl|for loop}} is substituted || style="text-align: center" | true | ||
|} | |} | ||
| − | + | ''Either'' option 1 (iteration parameters) ''or'' option 2 (an explicit list of values) may be used, but not both. | |
| − | The | + | The first unnamed parameter, prior to any explicit values, is a separator. The separator is a string that is output ''between'' calls to the template named in <code>|call=</code>. It is not output after the last call. |
| − | ==Examples== | + | === Caution === |
| + | *The separator can be prefixed with "1=", but in that case it cannot contain newlines and spaces at the start and end. | ||
| + | *If any parameter value contains an equals sign, use {{tlx|{{=}}}} (see [[Help:Template#Usage hints and workarounds|Template Usage hints and workarounds]]). | ||
| + | *If you use named parameters, note that the first value is parameter 2 (e.g. <code>|2=Your1stValue</code>), because parameter 1 is the separator. | ||
| + | *If you use named parameters, you must not skip any numbers. The loop will terminate after the first absent numbered parameter. (Parameters can be blank, but not absent.) | ||
| + | |||
| + | === Substitution === | ||
| + | The current Lua-based template supports [[WP:SUBST|substitution]]. If {{para|substall|no}} is not specified, then substituting the template will substitute everything, including the call to the template passed in {{para|call}}. If it is specified, then the template substitutes into a sequence of calls to the template specified. | ||
| + | |||
| + | Example: {{tlxs|for loop|sep |01|02|03|04|05|06|07|call{{=}}1x}} -> <code><nowiki>01sep 02sep 03sep 04sep 05sep 06sep 07</nowiki></code>, {{tlxs|for loop|sep |01|02|03|04|05|06|07|call={{1x}}|substall{{=}}no}} -> <code><nowiki>{{1x|01}}sep {{1x|02}}sep {{1x|03}}sep {{1x|04}}sep {{1x|05}}sep {{1x|06}}sep {{1x|07}}</nowiki></code> | ||
| + | |||
| + | For full substitution [[Special:ExpandTemplates]] can also be used. | ||
| + | |||
| + | == Examples == | ||
{| class="wikitable", border=1 | {| class="wikitable", border=1 | ||
| + | !Form | ||
!Code | !Code | ||
!Explanation | !Explanation | ||
!Result | !Result | ||
|- | |- | ||
| + | ! scope=row | Iterator | ||
| | | | ||
<pre>{{for loop|&|call = spanbox | <pre>{{for loop|&|call = spanbox | ||
| + | |pv = font size | ||
| + | |start=10|stop=52|by=8 | ||
| + | |postfix = px | ||
|pc1n = 1 | |pc1n = 1 | ||
|pc1v = A | |pc1v = A | ||
|pc2n = background | |pc2n = background | ||
|pc2v = yellow | |pc2v = yellow | ||
| − | |||
| − | |||
| − | |||
}}</pre> | }}</pre> | ||
| − | | | + | | Call the template "spanbox" with values: |
| + | *font size = "[N]px", where N takes values starting with 10 and increasing by 8 while remaining less than or equal to 52 | ||
*1 (first unnamed parameter) = "A" | *1 (first unnamed parameter) = "A" | ||
*background = "yellow" | *background = "yellow" | ||
| − | + | Separating outputs with "&" | |
|{{for loop|&|call = spanbox | |{{for loop|&|call = spanbox | ||
| + | |pv = font size | ||
| + | |start=10|stop=52|by=8 | ||
| + | |postfix = px | ||
|pc1n = 1 | |pc1n = 1 | ||
|pc1v = A | |pc1v = A | ||
|pc2n = background | |pc2n = background | ||
|pc2v = yellow | |pc2v = yellow | ||
| − | |||
| − | |||
| − | |||
}} | }} | ||
|- | |- | ||
| + | ! scope=row | Explicit values | ||
|<pre>{{for loop|, |call=1x | |<pre>{{for loop|, |call=1x | ||
|prefix=1 | |prefix=1 | ||
| Line 101: | Line 125: | ||
|} | |} | ||
| − | ===Other examples=== | + | === Other examples with explicit values === |
| − | |||
<code><nowiki>{{for loop|-|a|3||c|g|call=3x}}</nowiki></code> using {{tiw|3x}} gives | <code><nowiki>{{for loop|-|a|3||c|g|call=3x}}</nowiki></code> using {{tiw|3x}} gives | ||
| Line 167: | Line 190: | ||
|11{{=}}{{=}}{{=}}|12|13|14|15|16|17|18|19|call=1x}}<-end | |11{{=}}{{=}}{{=}}|12|13|14|15|16|17|18|19|call=1x}}<-end | ||
| − | == | + | == Notes about legacy codes == |
| − | + | This template is currently in its third incarnation. It now uses the [[WP:Lua|Lua]] code at [[Module:For loop]]. It was ported to Lua from [[mw:Help:Extension:ParserFunctions|ParserFunctions]]. There was also a previous version with a named "sep" parameter to specify the separator value. The template was originally based on [[m:Template:For|Template:For on meta]]. The template name was changed because there was already a [[Template:For|Template:For on Wikipedia]]. | |
| − | This template is currently in its third incarnation. It now uses the [[WP:Lua|Lua]] code at [[Module: | ||
The old versions were limited to 150 variable values and four fixed parameters. There are no such limits in the current version. Also, in the first version the "sep" parameter didn't allow whitespace in the separator value. This was fixed with the second version and was retained in the current version. | The old versions were limited to 150 variable values and four fixed parameters. There are no such limits in the current version. Also, in the first version the "sep" parameter didn't allow whitespace in the separator value. This was fixed with the second version and was retained in the current version. | ||
| − | + | == See also == | |
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | ==See also== | ||
*[[mw:Template:Fe]] | *[[mw:Template:Fe]] | ||
| − | * | + | *[[mw:Template:foreach]] |
*{{tim|tblb}} | *{{tim|tblb}} | ||
*{{tiw|for nowiki}} | *{{tiw|for nowiki}} | ||
| Line 194: | Line 207: | ||
*[[mw:Extension:LoopFunctions]] | *[[mw:Extension:LoopFunctions]] | ||
| − | <includeonly>{{ | + | <includeonly>{{sandbox other|| |
| − | <!-- | + | <!-- Add categories below this line, and interwikis at Wikidata --> |
[[Category:Wikipedia formatting and function templates]] | [[Category:Wikipedia formatting and function templates]] | ||
}}</includeonly> | }}</includeonly> | ||
Latest revision as of 20:52, 30 August 2020
| This is a documentation subpage for Template:For loop. It contains usage information, categories and other content that is not part of the original template page. |
| This template is used on approximately 53,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them.
Transclusion count updated automatically (see documentation). |
| This template uses Lua: |
This template implements a for loop or a foreach loop.
This template calls a user-specified template (the "called template") multiple times: once for each value in either 1) an iterated sequence or 2) an explicit list. Each value in the sequence or list is passed to the same specified parameter of the called template (the "variable parameter"). Optionally, pre- and postfixes can be attached to the passed values.
In addition to the specified variable parameter, other parameters of the called template ("static parameters") can be given a value which is the same in each iteration.
Contents
Usage
| Group | Parameter | Meaning | Default value |
|---|---|---|---|
| Mandatory | 1 (unnamed) | separator to output between calls (may be blank; whitespace is preserved) | |
| call | template to call | ||
| pv | name (or number) of the variable parameter of the called template | 1 | |
| Option 1: iterated sequence |
start | first numeric value to pass to variable parameter | 1 |
| stop | maximum numeric value for variable parameter | ||
| by | iteration step size between values passed to variable parameter | 1 | |
| Option 2: explicit values |
(unnamed parameters) | explicit values, given as separate parameters (whitespace is stripped) | |
| skipBlanks | set to "true" to skip empty parameter values | false | |
| Other optional parameters |
pc[N]n | name (or number) of the Nth static parameter of the called template | |
| pc[N]v | value for the Nth static parameter of the called template | ||
| prefix | static prefix prepended to each value passed to the variable parameter | ||
| postfix | static postfix appended to each value passed to the variable parameter | ||
| substall | set to "false" to not substitute the called template when {{for loop}} is substituted | true |
Either option 1 (iteration parameters) or option 2 (an explicit list of values) may be used, but not both.
The first unnamed parameter, prior to any explicit values, is a separator. The separator is a string that is output between calls to the template named in |call=. It is not output after the last call.
Caution
- The separator can be prefixed with "1=", but in that case it cannot contain newlines and spaces at the start and end.
- If any parameter value contains an equals sign, use
{{=}}(see Template Usage hints and workarounds). - If you use named parameters, note that the first value is parameter 2 (e.g.
|2=Your1stValue), because parameter 1 is the separator. - If you use named parameters, you must not skip any numbers. The loop will terminate after the first absent numbered parameter. (Parameters can be blank, but not absent.)
Substitution
The current Lua-based template supports substitution. If |substall=no is not specified, then substituting the template will substitute everything, including the call to the template passed in |call=. If it is specified, then the template substitutes into a sequence of calls to the template specified.
Example: {{subst:for loop|sep|01|02|03|04|05|06|07|call=1x}} -> 01sep 02sep 03sep 04sep 05sep 06sep 07, {{subst:for loop|sep|01|02|03|04|05|06|07|substall=no}} -> {{1x|01}}sep {{1x|02}}sep {{1x|03}}sep {{1x|04}}sep {{1x|05}}sep {{1x|06}}sep {{1x|07}}
For full substitution Special:ExpandTemplates can also be used.
Examples
| Form | Code | Explanation | Result |
|---|---|---|---|
| Iterator |
{{for loop|&|call = spanbox
|pv = font size
|start=10|stop=52|by=8
|postfix = px
|pc1n = 1
|pc1v = A
|pc2n = background
|pc2v = yellow
}}
|
Call the template "spanbox" with values:
Separating outputs with "&" |
Lua error: expandTemplate: template "spanbox" does not exist. |
| Explicit values | {{for loop|, |call=1x
|prefix=1
|00|01|02|03|04|05|06|07|08|09
|10|11|12|13|14|15|16|17|18|19
|20|21|22|23|24|25|26|27|28|29
|30|31|32|33|34|35|36|37|38|39
|40|41|42|43|44|45|46|47|48|49
|50|51|52|53|54|55|56|57|58|59
|60|61|62|63|64|65|66|67|68|69
|70|71|72|73|74|75|76|77|78|79
|80|81|82|83|84|85|86|87|88|89
|90|91|92|93|94|95|96|97|98|99
}}
|
Call the template "1x" with values "1[NN]", where NN = "00" through "99" (given explicitly), separating the outputs with the string ", " | 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199 |
Other examples with explicit values
{{for loop|-|a|3||c|g|call=3x}} using Template:3x (backlinks edit) gives
aaa-333-ccc-ggg
{{for loop|
|a|3||c|g|call=3x}} gives
aaa
333
ccc
ggg
{|class="wikitable sortable"
|-
!Test
|-
| {{for loop|
{{!}}-
{{!}} |a|b|c|d|e|call=3x}}
|}
gives:
| Test |
|---|
| aaa |
| bbb |
| ccc |
| ddd |
| eee |
{{for loop| |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|17|18|19
|20|21|22|23|24|25|26|27|28|29|30|31|32|33|34|35|36|37|38|39
|40|41|42|43|44|45|46|47|48|49|50|51|52|53|54|55|56|57|58|59
|60|61|62|63|64|65|66|67|68|69|70|71|72|73|74|75|76|77|78|79
|80|81|82|83|84|85|86|87|88|89|90|91|92|93|94|95|96|97|98|99
|100|101|102|103|104|105|106|107|108|109|110|111|112|113|114|115|116|117|118|119
|120|121|122|123|124|125|126|127|128|129|130|131|132|133|134|135|136|137|138|139
|140|141|142|143|144|145|146|147|148|149|150|151|152|153|154|call=1x}}
gives:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154
begin->{{for loop|{{=}} |01|02|03|04|05|06|07|08|09|10
|11{{=}}{{=}}{{=}}|12|13|14|15|16|17|18|19|call=1x}}<-end
gives:
begin->01= 02= 03= 04= 05= 06= 07= 08= 09= 10= 11==== 12= 13= 14= 15= 16= 17= 18= 19<-end
Notes about legacy codes
This template is currently in its third incarnation. It now uses the Lua code at Module:For loop. It was ported to Lua from ParserFunctions. There was also a previous version with a named "sep" parameter to specify the separator value. The template was originally based on Template:For on meta. The template name was changed because there was already a Template:For on Wikipedia.
The old versions were limited to 150 variable values and four fixed parameters. There are no such limits in the current version. Also, in the first version the "sep" parameter didn't allow whitespace in the separator value. This was fixed with the second version and was retained in the current version.
See also
- mw:Template:Fe
- mw:Template:foreach
- m:Template:tblb (backlinks edit)
- Template:for nowiki (backlinks edit)
- Template:item (backlinks edit)
- Template:loop (backlinks edit)
- Template:simple recursion (backlinks edit)
- Help:Parameter default
- Help:Array
- mw:Extension:LoopFunctions