mirror of
https://github.com/Jermolene/TiddlyWiki5
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59 lines
3.5 KiB
Plaintext
59 lines
3.5 KiB
Plaintext
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created: 20220110235808139
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modified: 20220122184232928
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tags: [[WikiText Parser Modes]]
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title: WikiText parser mode transitions
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type: text/vnd.tiddlywiki
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This is a <<.em rough>> diagram whose lines mostly correspond to the parser mode transitions described below:
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<$railroad text="""
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{<"pragma mode">
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{(
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{<"inline mode"> +} |
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({<"block mode">
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+("<<<" | "@@" | "$$")
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}
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"other block mode start punct")
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{<"inline mode"> +}
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)
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+(
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"block mode close punctuation" |
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("blank line" "html open tag")
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)}
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+("transclude widget" | "macrocall")
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}
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"""/>
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!! Start mode
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By default the parser starts in [[block mode|Block Mode WikiText]]. However, a tiddler can instead be transcluded with [[inline mode|Inline Mode WikiText]] in which case [[block mode WikiText|Block Mode WikiText]] will not be recognised.
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At the start of text only, the parser will also recognise any [[pragma mode WikiText|Pragma]].
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!! Transitions from pragma mode
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At the start of text, the parser will recognise any [[pragma|Pragma]]. If none are found then it will move to [[inline|Inline Mode WikiText]] or [[block|Block Mode WikiText]] mode depending on the transclusion mode. If any [[pragma|Pragma]] are found then it will continue looking for [[pragma|Pragma]] until it finds one or more blank lines not followed by the start of a new pragma.
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!! Transitions from block mode
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When the parser encounters most [[block mode|Block Mode WikiText]] start punctuation it transitions to [[inline mode|Inline Mode WikiText]]. This means
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he text enclosed by most [[block mode|Block Mode WikiText]] constructs will be parsed using [[inline mode|Inline Mode WikiText]].
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<<.tip """The start "punctuation" for a paragraph is "invisible". Even for paragraphs the parser moves to [[inline mode|Inline Mode WikiText]]""">>
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However, there are a few constructs whose enclosed text is parsed using [[block mode|Block Mode WikiText]]:
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* [[Multi-line block quotes|Block Quotes in WikiText]]
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* [[Multi-line style blocks|Styles and Classes in WikiText]]
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* [[Typed blocks|Typed Blocks in WikiText]]
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When the start punctuation for these are encountered, the enclosed text will continue to be parsed in [[block mode|Block Mode WikiText]].
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[[Horizontal rules|Horizontal Rules in WikiText]] are another special case. They do not enclose any text, so there is no opportunity for the parser to transition to [[inline mode|Inline Mode WikiText]].
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Opening [[widget|Widgets in WikiText]] or [[HTML|HTML in WikiText]] tags provide another way the parser can transition. When such a tag is <<.em not>> followed by a blank line, then the contents enclosed by the tag will be parsed in [[inline mode|Inline Mode WikiText]]. See the [[HTML examples|WikiText parser mode: HTML examples]].
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!! Transitions from inline mode
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* The parser will move back to [[block mode|Block Mode WikiText]] after the end of a line which terminates [[block mode|Block Mode WikiText]] ~WikiText. In other words, when the block mode close punctuation is encountered.
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* When the opening [[widget|Widgets in WikiText]] or [[HTML|HTML in WikiText]] tag is followed by a blank line, then the contents enclosed by the tag will be parsed in [[block mode|Block Mode WikiText]]. See the [[HTML examples|WikiText parser mode: HTML examples]].
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* Transcluded text and text pulled in via a macro call can transition the parser away from [[inline mode|Inline Mode WikiText]]. See [[transclusion examples|WikiText parser mode: transclusion examples]] and [[macro examples|WikiText parser mode: macro examples]] for more details.
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