mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-11-27 20:10:03 +00:00
100 lines
2.4 KiB
Plaintext
100 lines
2.4 KiB
Plaintext
created: 20150103184022184
|
|
modified: 20150119220342000
|
|
title: $:/plugins/tiddlywiki/railroad/syntax
|
|
|
|
The railroad widget uses a special notation to construct the components defined below.
|
|
|
|
`x` and `y` here stand for any component.
|
|
|
|
Names (as opposed to quoted strings) are available when a value starts with a letter and contains only letters, digits, underscores, dots and hyphens.
|
|
|
|
---
|
|
|
|
; sequence
|
|
: <$railroad text=""" ["<-"] {x} ["->"] """/>
|
|
* A sequence of components
|
|
* The `<-` and `->` delimiters allow you to force a single component to be treated as a sequence. This is occasionally useful for spacing a diagram out
|
|
|
|
---
|
|
|
|
; optional
|
|
: <$railroad text=""" "[" [":"] x "]" """/>
|
|
* A component that can be omitted
|
|
* The colon makes `x` appear straight ahead
|
|
|
|
---
|
|
|
|
; repeated
|
|
: <$railroad text=""" "{" x [:"+" y] "}" """/>
|
|
* A list of one or more `x`
|
|
* The `+` suffix adds `y` as a separator between each `x` and the next
|
|
|
|
---
|
|
|
|
; optional repeated
|
|
: <$railroad text=""" "[{" [":"] x [:"+" y] "}]" """/>
|
|
* An optional list of `x`, i.e. a list of zero or more `x`
|
|
|
|
---
|
|
|
|
; choice
|
|
: <$railroad text=""" "(" {[:":"] x +"|"} ")" """/>
|
|
* A set of alternatives
|
|
* The colon indicates which branch appears straight ahead. By default, it's the first branch
|
|
|
|
---
|
|
|
|
; string / terminal
|
|
: <$railroad text={{$:/plugins/tiddlywiki/railroad/syntax-string}}/>
|
|
* A literal or terminal component
|
|
* This follows the normal ~TiddlyWiki rules for quoted strings
|
|
|
|
---
|
|
|
|
; nonterminal
|
|
: <$railroad text=""" (name | "<" string ">") """/>
|
|
* A nonterminal component, i.e. the name of another diagram
|
|
|
|
---
|
|
|
|
; comment
|
|
: <$railroad text=""" "/" string "/" """/>
|
|
* A comment
|
|
|
|
---
|
|
|
|
; dummy
|
|
: <$railroad text=""" "-" """/>
|
|
* The absence of a component
|
|
|
|
---
|
|
|
|
; link
|
|
: <$railroad text=""" "[[" x "|" (name|string) "]]" """/>
|
|
* A link to the tiddler title or URI given by the string or name
|
|
|
|
---
|
|
|
|
; transclusion
|
|
: <$railroad text=""" "{{" (name|string) "}}" """/>
|
|
* Treats the content of another tiddler as diagram syntax and transcludes it into the current diagram
|
|
|
|
---
|
|
|
|
; arrow pragma
|
|
: <$railroad text=""" "\arrow" ("yes" | "no") """/>
|
|
* Controls whether repeat paths have an arrow on them
|
|
* Can be toggled on and off in mid-diagram, if desired
|
|
|
|
---
|
|
|
|
; debug pragma
|
|
: <$railroad text=""" "\debug" """/>
|
|
* Causes the diagram to display its parse tree
|
|
|
|
---
|
|
|
|
; start/end pragma
|
|
: <$railroad text=""" ("\start" |: "\end") ("none" |: "single" | "double") """/>
|
|
* Controls the style of the diagram's startpoint or endpoint
|