116 lines
3.6 KiB
Text
116 lines
3.6 KiB
Text
/-
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Copyright (c) 2018 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Author: Sebastian Ullrich
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Notation parsers
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-/
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prelude
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import init.lean.parser.token
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namespace lean
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namespace parser
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namespace «command»
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open combinators monad_parsec
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open parser.has_tokens parser.has_view
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local postfix `?`:10000 := optional
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local postfix *:10000 := combinators.many
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local postfix +:10000 := combinators.many1
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set_option class.instance_max_depth 100
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namespace notation_spec
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@[derive parser.has_tokens parser.has_view]
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def precedence.parser : term_parser :=
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node! «precedence» [":", prec: number.parser]/-TODO <|> expr-/
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def quoted_symbol.parser : term_parser :=
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do (s, info) ← with_source_info $ take_until (= '`'),
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pure $ syntax.atom ⟨info, s⟩
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instance quoted_symbol.tokens : parser.has_tokens quoted_symbol.parser := ⟨[]⟩
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instance quoted_symbol.view : parser.has_view quoted_symbol.parser syntax := default _
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@[derive parser.has_tokens parser.has_view]
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def symbol_quote.parser : term_parser :=
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node! notation_quoted_symbol [
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left_quote: raw $ ch '`',
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symbol: quoted_symbol.parser,
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right_quote: raw (ch '`') tt, -- consume trailing ws
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prec: precedence.parser?]
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--TODO(Sebastian): cannot be called `symbol` because of hygiene problems
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@[derive parser.has_tokens parser.has_view]
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def notation_symbol.parser : term_parser :=
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node_choice! notation_symbol {
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quoted: symbol_quote.parser
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--TODO, {read := do tk ← token, /- check if reserved token-/}
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}
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@[derive parser.has_tokens parser.has_view]
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def action.parser : term_parser :=
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node! action [":", action: node_choice! action_kind {
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prec: number.parser,
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max: symbol_or_ident "max",
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prev: symbol_or_ident "prev",
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scoped: symbol_or_ident "scoped"
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/-TODO seq [
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"(",
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any_of ["foldl", "foldr"],
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optional prec,
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notation_tk,-/}]
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@[derive parser.has_tokens parser.has_view]
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def transition.parser : term_parser :=
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node_choice! transition {
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binder: node! binder ["binder", prec: precedence.parser?],
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binders: node! binders ["binders", prec: precedence.parser?],
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arg: node! argument [id: ident.parser, action: action.parser?]
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}
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@[derive parser.has_tokens parser.has_view]
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def rule.parser : term_parser :=
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node! rule [symbol: notation_symbol.parser, transition: transition.parser?]
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end notation_spec
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@[derive parser.has_tokens parser.has_view]
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def notation_spec.parser : term_parser :=
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node_choice! notation_spec {
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number_literal: number.parser,
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rules: node! notation_spec.rules [id: ident.parser?, rules: notation_spec.rule.parser*]
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}
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@[derive parser.has_tokens parser.has_view]
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def notation.parser : term_parser :=
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node! «notation» ["notation", spec: notation_spec.parser, ":=", term: recurse 0]
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@[derive parser.has_tokens parser.has_view]
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def reserve_notation.parser : term_parser :=
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node! «reserve_notation» [try ["reserve", "notation"], spec: notation_spec.parser]
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@[derive parser.has_tokens parser.has_view]
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def mixfix.kind.parser : term_parser :=
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node_choice! mixfix.kind {"prefix", "infix", "infixl", "infixr", "postfix"}
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@[derive parser.has_tokens parser.has_view]
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def mixfix.parser : term_parser :=
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node! «mixfix» [
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kind: mixfix.kind.parser,
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symbol: notation_spec.notation_symbol.parser, ":=", term: recurse 0]
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@[derive parser.has_tokens parser.has_view]
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def notation_like.parser : term_parser :=
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node_choice! notation_like {«notation»: notation.parser, mixfix: mixfix.parser}
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@[derive parser.has_tokens parser.has_view]
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def reserve_mixfix.parser : term_parser :=
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node! «reserve_mixfix» [
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try ["reserve", kind: mixfix.kind.parser],
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symbol: notation_spec.notation_symbol.parser]
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end «command»
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end parser
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end lean
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