144 lines
4.8 KiB
Plaintext
144 lines
4.8 KiB
Plaintext
/-
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Copyright (c) 2021 Wojciech Nawrocki. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Wojciech Nawrocki, Sebastian Ullrich, Henrik Böving
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-/
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import Lean.Data.Json
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import Lean.Parser
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/-! This module defines:
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- a representation of HTML trees
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- together with a JSX-like DSL for writing them
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- and widget support for visualizing any type as HTML. -/
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namespace DocGen4
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open Lean
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inductive Html where
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-- TODO(WN): it's nameless for shorter JSON; re-add names when we have deriving strategies for From/ToJson
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-- element (tag : String) (flatten : Bool) (attrs : Array HtmlAttribute) (children : Array Html)
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| element : String → Bool → Array (String × String) → Array Html → Html
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| text : String → Html
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deriving Repr, BEq, Inhabited, FromJson, ToJson
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instance : Coe String Html :=
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⟨Html.text⟩
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namespace Html
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def attributesToString (attrs : Array (String × String)) :String :=
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attrs.foldl (λ acc (k, v) => acc ++ " " ++ k ++ "=\"" ++ v ++ "\"") ""
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-- TODO: Termination proof
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partial def toStringAux : Html → String
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| element tag false attrs #[text s] => s!"<{tag}{attributesToString attrs}>{s}</{tag}>\n"
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| element tag false attrs #[child] => s!"<{tag}{attributesToString attrs}>\n{child.toStringAux}</{tag}>\n"
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| element tag false attrs children => s!"<{tag}{attributesToString attrs}>\n{children.foldl (· ++ toStringAux ·) ""}</{tag}>\n"
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| element tag true attrs children => s!"<{tag}{attributesToString attrs}>{children.foldl (· ++ toStringAux ·) ""}</{tag}>"
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| text s => s
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def toString (html : Html) : String :=
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html.toStringAux.trimRight
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instance : ToString Html :=
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⟨toString⟩
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partial def textLength : Html → Nat
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| text s => s.length
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| element _ _ _ children =>
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let lengths := children.map textLength
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lengths.foldl Nat.add 0
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def escapePairs : Array (String × String) :=
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#[
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("&", "&"),
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("<", "<"),
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(">", ">"),
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("\"", """)
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]
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def escape (s : String) : String :=
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escapePairs.foldl (λ acc (o, r) => acc.replace o r) s
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end Html
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namespace Jsx
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open Parser PrettyPrinter
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declare_syntax_cat jsxElement
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declare_syntax_cat jsxChild
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-- JSXTextCharacter : SourceCharacter but not one of {, <, > or }
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def jsxText : Parser :=
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withAntiquot (mkAntiquot "jsxText" `jsxText) {
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fn := fun c s =>
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let startPos := s.pos
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let s := takeWhile1Fn (not ∘ "[{<>}]$".contains) "expected JSX text" c s
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mkNodeToken `jsxText startPos c s }
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@[combinatorFormatter DocGen4.Jsx.jsxText] def jsxText.formatter : Formatter := pure ()
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@[combinatorParenthesizer DocGen4.Jsx.jsxText] def jsxText.parenthesizer : Parenthesizer := pure ()
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syntax jsxAttrName := rawIdent <|> str
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syntax jsxAttrVal := str <|> group("{" term "}")
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syntax jsxSimpleAttr := jsxAttrName "=" jsxAttrVal
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syntax jsxAttrSpread := "[" term "]"
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syntax jsxAttr := jsxSimpleAttr <|> jsxAttrSpread
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syntax "<" rawIdent jsxAttr* "/>" : jsxElement
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syntax "<" rawIdent jsxAttr* ">" jsxChild* "</" rawIdent ">" : jsxElement
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syntax jsxText : jsxChild
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syntax "{" term "}" : jsxChild
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syntax "[" term "]" : jsxChild
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syntax jsxElement : jsxChild
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scoped syntax:max jsxElement : term
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def translateAttrs (attrs : Array Syntax) : MacroM Syntax := do
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let mut as ← `(#[])
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for attr in attrs do
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as ← match attr with
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| `(jsxAttr| $n:jsxAttrName=$v:jsxAttrVal) =>
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let n ← match n with
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| `(jsxAttrName| $n:str) => pure n
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| `(jsxAttrName| $n:ident) => pure $ quote (toString n.getId)
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| _ => Macro.throwUnsupported
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let v ← match v with
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| `(jsxAttrVal| {$v}) => pure v
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| `(jsxAttrVal| $v:str) => pure v
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| _ => Macro.throwUnsupported
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`(($as).push ($n, ($v : String)))
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| `(jsxAttr| [$t]) => `($as ++ ($t : Array (String × String)))
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| _ => Macro.throwUnsupported
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return as
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macro_rules
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| `(<$n $attrs* />) => do
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`(Html.element $(quote (toString n.getId)) true $(← translateAttrs attrs) #[])
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| `(<$n $attrs* >$children*</$m>) => do
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unless n.getId == m.getId do
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withRef m <| Macro.throwError s!"expected </{n.getId}>"
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let mut cs ← `(#[])
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for child in children do
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cs ← match child with
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| `(jsxChild|$t:jsxText) => `(($cs).push (Html.text $(quote t[0].getAtomVal!)))
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-- TODO(WN): elab as list of children if type is `t Html` where `Foldable t`
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| `(jsxChild|{$t}) => `(($cs).push ($t : Html))
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| `(jsxChild|[$t]) => `($cs ++ ($t : Array Html))
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| `(jsxChild|$e:jsxElement) => `(($cs).push ($e:jsxElement : Html))
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| _ => Macro.throwUnsupported
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let tag := toString n.getId
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`(Html.element $(quote tag) false $(← translateAttrs attrs) $cs)
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end Jsx
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/-- A type which implements `ToHtmlFormat` will be visualized
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as the resulting HTML in editors which support it. -/
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class ToHtmlFormat (α : Type u) where
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formatHtml : α → Html
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end DocGen4
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