mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-02 08:06:17 +00:00
94 lines
2.8 KiB
Plaintext
94 lines
2.8 KiB
Plaintext
created: 20240310165023000
|
|
modified: 20240310175033730
|
|
tags: [[Procedure Syntax]]
|
|
title: Procedure Definition Syntax
|
|
type: text/vnd.tiddlywiki
|
|
|
|
<<.preamble """What follows is a formal presentation of the syntax of the [[Pragma: \procedure]], using [[railroad diagrams|Railroad Diagrams]]. """>>
|
|
|
|
! \procedure
|
|
|
|
There are 2 types of procedure definitions
|
|
|
|
* Single line definitions
|
|
* Multi line definitions
|
|
|
|
!! Single Line
|
|
|
|
Single line definitions should only be used for very short bodies, where the procedure name, params and the body fit into 1 line terminated with a line-feed.
|
|
|
|
<$railroad text="""
|
|
"\procedure"
|
|
[[<"space">|"Filter Whitespace"]]
|
|
"procedure-name"
|
|
<"(params)">
|
|
[:[[<"space">|"Filter Whitespace"]]]
|
|
"body"
|
|
"lf"
|
|
"""/>
|
|
|
|
!! Multi Line
|
|
|
|
The majority of procedure definitions will have a body, that spans over several lines of wikitext. Those procedure definitions are terminated using the "\end" pragma
|
|
|
|
<$railroad text="""
|
|
"\procedure"
|
|
[[<"space">|"Filter Whitespace"]]
|
|
"procedure-name"
|
|
<"(params)">
|
|
[:[[<"space">|"Filter Whitespace"]]]
|
|
body
|
|
"\end"
|
|
"""/>
|
|
|
|
The [[procedure-name|Procedures]] is a sequence of non-whitespace characters other than `(` or `>`.
|
|
|
|
|
|
* <<.place procedure-name>> is a sequence of letters (`A`--`Z`, `a`--`z`), digits (`0`--`9`), hyphens (`-`) and underscores (`_`)
|
|
* <<.place body>> is wikitext including [[nested procedures|Pragma: \procedure]]
|
|
* <<.place space>> denotes a sequence of [[whitespace characters|Filter Whitespace]]
|
|
|
|
!! params
|
|
|
|
The parameter declaration list <<.place (params)>> has the following syntax:
|
|
|
|
<$railroad text="""
|
|
\start none
|
|
\end none
|
|
"(" [:"sep"] [:{ parameter "sep" }] ")"
|
|
"""/>
|
|
|
|
* <<.place sep>> is any sequence of characters that does not match a <<.place param-name>>. <br>Among other things, this includes commas, spaces and linefeeds.
|
|
|
|
|
|
Each ''individual'' <<.place parameter>> has the following syntax:
|
|
|
|
<$railroad text="""
|
|
\start none
|
|
\end none
|
|
"param-name" [: [:[[<"space">|"Filter Whitespace"]]] ":" [:[[<"space">|"Filter Whitespace"]]] default ]
|
|
"""/>
|
|
|
|
* <<.place param-name>> is a sequence of letters (`A`--`Z`, `a`--`z`), digits (`0`--`9`), hyphens (`-`) and underscores (`_`).
|
|
|
|
* <<.place default>> is an optional value of a parameter is specified as follows:
|
|
|
|
<$railroad text={{$:/editions/tw5.com/railroad/macro-parameter-value}}/>
|
|
|
|
!! body
|
|
|
|
The <<.place body>> of the definition has the following syntax:
|
|
|
|
<$railroad text="""
|
|
\start none
|
|
\end none
|
|
{[[<"wikitext">|WikiText]] "lf"}
|
|
"""/>
|
|
|
|
* <<.place wikitext>> is any sequence of characters that doesn't terminate the macro definition.
|
|
** If [[nested procedures|Pragma: \procedure]] are used they need to be at the start of the wikitext. There are the same rules as if the wikitext would be in a tiddler.
|
|
** Pragmas need to be before standard wikitext.
|
|
|
|
* <<.place lf>> denotes a linefeed.
|
|
|