mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-12-29 11:30:28 +00:00
350 lines
4.6 KiB
Plaintext
350 lines
4.6 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
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
x y z sequence
|
|
```
|
|
<$railroad text=""" x y z """/>
|
|
|
|
```
|
|
<-x y z-> explicit sequence
|
|
```
|
|
|
|
<$railroad text=""" <- x y z -> """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; optional
|
|
: <$railroad text=""" "[" [":"] x "]" """/>
|
|
* A component that can be omitted
|
|
* The colon makes `x` appear straight ahead
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
[:x] optional, normally included
|
|
```
|
|
<$railroad text=""" [:x] """/>
|
|
|
|
```
|
|
[x] optional, normally omitted
|
|
```
|
|
|
|
<$railroad text=""" [x] """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; repeated
|
|
: <$railroad text=""" "{" x [:"+" y] "}" """/>
|
|
* A list of one or more `x`
|
|
* The `+` suffix adds `y` as a separator between each `x` and the next
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
{x} one or more
|
|
```
|
|
<$railroad text=""" {x} """/>
|
|
|
|
```
|
|
{x +","} one or more, comma-separated
|
|
```
|
|
|
|
<$railroad text=""" {x +","} """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; optional repeated
|
|
: <$railroad text=""" "[{" [":"] x [:"+" y] "}]" """/>
|
|
* An optional list of `x`, i.e. a list of zero or more `x`
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
[{:x}] zero or more, normally included
|
|
```
|
|
|
|
<$railroad text=""" [{:x}] """/>
|
|
|
|
```
|
|
[{:x +","}] zero or more, comma-separated, normally included
|
|
```
|
|
|
|
<$railroad text=""" [{:x +","}] """/>
|
|
|
|
```
|
|
[{x}] zero or more, normally omitted
|
|
```
|
|
|
|
<$railroad text=""" [{x}] """/>
|
|
|
|
```
|
|
[{x +","}] zero or more, comma-separated, normally omitted
|
|
```
|
|
|
|
<$railroad text=""" [{x +","}] """/>
|
|
|
|
<<<
|
|
|
|
|
|
|
|
---
|
|
|
|
; choice
|
|
: <$railroad text=""" "(" {[:":"] x +"|"} ")" """/>
|
|
* A set of alternatives
|
|
* The colon indicates which branch appears straight ahead. By default, it's the first branch
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
(x|y|z) alternatives
|
|
```
|
|
|
|
<$railroad text=""" (x|y|z) """/>
|
|
|
|
```
|
|
(x|:y|z) alternatives, normally y
|
|
```
|
|
|
|
<$railroad text=""" (x|:y|z) """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; string / terminal
|
|
: <$railroad text={{$:/plugins/tiddlywiki/railroad/syntax-string}}/>
|
|
* A literal or terminal component
|
|
* This follows the normal ~TiddlyWiki rules for quoted strings
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
"x" terminal
|
|
```
|
|
|
|
<$railroad text=""" "x" """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; nonterminal
|
|
: <$railroad text=""" (name | "<" string ">") """/>
|
|
* A nonterminal component, i.e. the name of another diagram
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
<"x"> nonterminal
|
|
```
|
|
|
|
<$railroad text=""" <"x"> """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; comment
|
|
: <$railroad text=""" "/" string "/" """/>
|
|
* A comment
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
/ "comment" / comment
|
|
```
|
|
|
|
<$railroad text=""" / "comment" / """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; dummy
|
|
: <$railroad text=""" "-" """/>
|
|
* The absence of a component
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
- dummy
|
|
```
|
|
|
|
<$railroad text=""" - """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; link
|
|
: <$railroad text=""" "[[" x "|" (name|string) "]]" """/>
|
|
* A link to the tiddler title or URI given by the string or name
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
[[x|"tiddler"]] link
|
|
```
|
|
|
|
<$railroad text=""" [[x|"tiddler"]] """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; transclusion
|
|
: <$railroad text=""" "{{" (name|string) "}}" """/>
|
|
* Treats the content of another tiddler as diagram syntax and transcludes it into the current diagram
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
{{"$:/plugins/tiddlywiki/railroad/example-transclusion"}} transclusion
|
|
|
|
// "railroad transclusion example" text <- text in the tidlder
|
|
|
|
```
|
|
|
|
<$railroad text=""" {{ "$:/plugins/tiddlywiki/railroad/example-transclusion" }} """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; arrow pragma
|
|
: <$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
|
|
|
|
examples
|
|
|
|
<<<
|
|
```
|
|
<$railroad text="""
|
|
\arrow yes
|
|
[{:x}]
|
|
"""/>
|
|
|
|
```
|
|
|
|
<$railroad text="""\arrow yes [{:x}] """/>
|
|
|
|
```
|
|
<$railroad text="""
|
|
\arrow no
|
|
[{:x}]
|
|
"""/>
|
|
```
|
|
|
|
<$railroad text="""\arrow no [{:x}] """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; debug pragma
|
|
: <$railroad text=""" "\debug" """/>
|
|
* Causes the diagram to display its parse tree
|
|
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
\debug
|
|
x
|
|
```
|
|
|
|
<$railroad text="""\debug x """/>
|
|
|
|
<<<
|
|
|
|
|
|
---
|
|
|
|
; start/end pragma
|
|
: <$railroad text=""" ("\start" |: "\end") ("none" |: "single" | "double") """/>
|
|
* Controls the style of the diagram's startpoint or endpoint
|
|
examples
|
|
|
|
<<<
|
|
|
|
```
|
|
\start none x
|
|
```
|
|
|
|
<$railroad text=""" \start none x """/>
|
|
|
|
```
|
|
\start double
|
|
\end double
|
|
x
|
|
```
|
|
|
|
<$railroad text=""" \start double
|
|
\end double
|
|
x
|
|
"""/>
|
|
|
|
<<<
|
|
|