This Lua module is used on approximately 1,640,000 pages, or roughly 2% of all pages. To avoid major disruption and server load, any changes should be tested in the module's /sandbox or /testcases subpages, or in your own module sandbox. The tested changes can be added to this page in a single edit. Consider discussing changes on the talk page before implementing them.

This module counts the number of parameters that are passed to a template. For example, you might put the code {{#invoke:ParameterCount|all}} inside the {{my template}} template. If you then use {{my template}} like this:

{{my template
| one
| two
| three
}}

Then the {{#invoke:ParameterCount|all}} code inside the template will give the result 3.

This module can be configured to count all parameters, or specific parameters defined by a template author. This module is only useful in templates. It should not be used on non-template pages.

The module has two functions available, all and main.

The all function is used to count all parameters specified when using a template, regardless of whether or not they are used in the template itself.

Usage

{{#invoke:ParameterCount|all}}

Examples

If the code {{#invoke:ParameterCount|all}} was added to the {{my example template}} template, the code {{my example template|1|2|foo=bar}} would make ParameterCount produce 3.

The main function is used to count parameters with specific names. There are two ways of specifying parameters: by name, and using Lua patterns.

By name

{{#invoke:ParameterCount|main|1|2|3|abc|def}}

To specify a parameter by name, add the parameter name as a positional parameter.

By pattern

{{#invoke:ParameterCount|main|pattern1=^param%d+$|pattern2=^abc}}

To specify parameters by Lua Ustring pattern, add the pattern to |pattern1=, |pattern2= etc. For information on constructing Lua patterns, see the Lua Users' Wiki pattern tutorial, as well as the Lua reference manual sections on Lua patterns and Ustring patterns.

Examples

If the code {{#invoke:ParameterCount|main|1|2|abc}} was added to the {{my example template}} template, the code {{my example template|1|2|abc=some value|other=some other value}} would make ParameterCount produce 3.

If the code {{#invoke:ParameterCount|main|pattern1=^param%d+$}} was added to the {{my example template}} template, the code {{my example template|param1=a value|param2=another value|param5=yet another value}} would make ParameterCount produce 3.

{{#invoke:ParameterCount|all|checkblanks=no}}

{{#invoke:ParameterCount|main|checkblanks=no}}

By default, the module doesn't count parameters whose values contain only whitespace, e.g. |abc=   . If you wish to count all parameters, regardless of their value, use |checkblanks=no. This works with both the all and main functions.

Examples

If the code {{#invoke:ParameterCount|all|checkblanks=no}} was added to the {{my example template}} template, the code {{my example template|1|2|foo=bar|baz=}} would make ParameterCount produce 4.

• {{#invoke:params|count}}