User:DESiegel60/If-PF/Doc

Purpose

With this template the parser functions of the ParserFunctions collection with names starting with "#if" can be used in a way such that they do not strip spaces and newlines from the "then" and "else" part. Spaces still do not affect the outcome of the condition.

Usage

• {{if||x| p | q }} gives "Template:If"
• {{if|expr|2<3| p | q }} gives " p "
• {{if|eq| u |u| p | q }} gives "Template:If"
• {{if|exist| Help:Link | p | q }} gives "Template:If"
• {{if|error|{{#expr:x}}| p | q }} gives "Template:If"

Compare:

• {{#if:x| p | q }} gives "{{#if:x| p | q }}"
• {{#ifexpr:2<3| p | q }} gives "{{#ifexpr:2<3| p | q }}"
• {{#ifeq: u |u| p | q }} gives "{{#ifeq: u |u| p | q }}"
• {{#ifexist: Help:Link | p | q }} gives "{{#ifexist: Help:Link | p | q }}"
• {{#iferror:{{#expr:x}}| p | q }} gives "{{#iferror:{{#expr:x}}| p | q }}"

For full substitution, use e.g. {{subst:if|expr|2<3| p | q |subst=subst:}}. If the condition contains a parser function or template etc., that should be substituted too. Optionally the "then" or "else" part can also be substituted.

Requirements

This template requires that the Parser Functions MediaWiki extension be installed.