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Procedure Calls

 19th April 2023 at 10:31am


This tiddler describes the different ways in which procedure can be called.

Procedure Call Transclusion Shortcut

To call a procedure, place <<double angle brackets>> around the name and any parameter values.

<<my-procedure param:"This is the parameter value">>

By default, parameters are listed in the same order as in the procedure definition. A parameter can be labelled with its name and a colon to allow them to be listed in a different order.

If no value is specified for a parameter, the default value given for that parameter in the procedure definition is used instead. (If no default value was defined, the parameter is blank).

Each parameter value can be enclosed in 'single quotes', "double quotes", """triple double quotes""" or [[double square brackets]]. Triple double quotes allow a value to contain almost anything. If a value contains no spaces or single or double quotes, it requires no delimiters.

See the discussion about parser modes

Procedure Calls with $transclude Widget

The shortcut syntax expands to the $transclude widget with the $variable attribute specifying the name of the procedure to transclude.

<$transclude $variable="my-procedure" param="This is the parameter value"/>

The widget itself offers greater flexibility than the shortcut syntax, including the ability to specify dynamic parameter values.

Assigning Procedure Calls to Attribute Values

The text of a procedure can be directly assigned to an attribute of a widget or HTML element. The result of the procedure is not wikified, which means that parameter handling does not take place.

<div class=<<myclasses>>>

Using Procedure Calls in Filters

Procedure calls can be used in filters. The text is not wikified which again means that the parameters will be ignored.

<$list filter="[<my-procedure>]">