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