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implement the djot parser

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Fills out src/Djot.hs, which was a skeleton of `error "todo"` stubs.

Three layers, so container prefixes and indentation never have to be
threaded through the parser state:

  - line primitives (rawLine/peekLine/lineWhen/dedent): block parsers peek
    at the next line, decide whether they want it, then consume it
  - container blocks strip their prefix off the lines they own and re-parse
    the result with subParse, a rank-2 helper that runs a polymorphic parser
    at Identity and shifts error offsets back into the outer input
  - inline content is a second pass over the text a block collected

Blocks: headings, paragraphs, block quotes, fenced code, raw blocks, divs,
tables (alignments, `^` captions, escaped pipes), footnote and reference
definitions, block attributes, thematic breaks, and lists -- bullet,
ordered (decimal/alpha/roman, `.`/`)`/`(n)`), task, and definition. Tight
lists unwrap their paragraphs to Transparent.

Inlines: emphasis and its braced forms, verbatim, raw inline, math, links,
reference links, images, autolinks, spans, footnote references, symbols,
escapes, hard breaks, attribute sets, and smart punctuation.

Two spots where the IR came up short:

  - there is no reference image, so for `![alt][ref]` the label lands in
    the url field
  - unordered lists get style = Nothing rather than the bullet character,
    which HTML.hs would otherwise emit as an invalid type="-"

Also includes the psb.cabal fix dropping OverloadedRecordUpdate, without
which Psb.Main does not build.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Pagwin 2026-09-04 15:15:33 -04:00
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commit d695910c7c
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2 changed files with 1018 additions and 396 deletions
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psb.cabal
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@ -30,7 +30,7 @@ library
exposed-modules: Djot Markdown HTML Logger IR Logger.Shake Psb.Main Utilities Utilities.FilePath Utilities.Action Utilities.Javascript Utilities.CSS Templates Types Config Utilities.Bundling
other-modules: Utilities.Parsing
build-depends: base, mustache >=2.4.2, shake >= 0.19.8, deriving-aeson >= 0.2.9, aeson, text >= 2.1.2, time, unordered-containers, yaml, megaparsec >= 9.7.0, transformers >= 0.6.2, bytestring
default-extensions: ApplicativeDo DataKinds NamedFieldPuns DerivingVia LambdaCase TypeApplications DeriveGeneric OverloadedRecordDot OverloadedRecordUpdate NamedFieldPuns DuplicateRecordFields DisambiguateRecordFields FlexibleInstances
default-extensions: ApplicativeDo DataKinds NamedFieldPuns DerivingVia LambdaCase TypeApplications DeriveGeneric OverloadedRecordDot NamedFieldPuns DuplicateRecordFields DisambiguateRecordFields FlexibleInstances
test-suite test-markdown-parse
hs-source-dirs: tests

1402
src/Djot.hs
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