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Extra.lean
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Extra.lean
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/-
Copyright (c) 2019 Microsoft Corporation. All rights reserved.
Released under Apache 2.0 license as described in the file LICENSE.
Authors: Leonardo de Moura, Sebastian Ullrich
-/
import Lean.Parser.Extension
-- necessary for auto-generation
import Lean.PrettyPrinter.Parenthesizer
import Lean.PrettyPrinter.Formatter
namespace Lean
namespace Parser
-- synthesize pretty printers for parsers declared prior to `Lean.PrettyPrinter`
-- (because `Parser.Extension` depends on them)
attribute [runBuiltinParserAttributeHooks]
leadingNode termParser commandParser mkAntiquot nodeWithAntiquot sepBy sepBy1
unicodeSymbol nonReservedSymbol
@[runBuiltinParserAttributeHooks] def optional (p : Parser) : Parser :=
optionalNoAntiquot (withAntiquotSpliceAndSuffix `optional p (symbol "?"))
@[runBuiltinParserAttributeHooks] def many (p : Parser) : Parser :=
manyNoAntiquot (withAntiquotSpliceAndSuffix `many p (symbol "*"))
@[runBuiltinParserAttributeHooks] def many1 (p : Parser) : Parser :=
many1NoAntiquot (withAntiquotSpliceAndSuffix `many p (symbol "*"))
@[runBuiltinParserAttributeHooks] def ident : Parser :=
withAntiquot (mkAntiquot "ident" identKind) identNoAntiquot
-- `ident` and `rawIdent` produce the same syntax tree, so we reuse the antiquotation kind name
@[runBuiltinParserAttributeHooks] def rawIdent : Parser :=
withAntiquot (mkAntiquot "ident" identKind) rawIdentNoAntiquot
@[runBuiltinParserAttributeHooks] def numLit : Parser :=
withAntiquot (mkAntiquot "numLit" numLitKind) numLitNoAntiquot
@[runBuiltinParserAttributeHooks] def scientificLit : Parser :=
withAntiquot (mkAntiquot "scientificLit" scientificLitKind) scientificLitNoAntiquot
@[runBuiltinParserAttributeHooks] def strLit : Parser :=
withAntiquot (mkAntiquot "strLit" strLitKind) strLitNoAntiquot
@[runBuiltinParserAttributeHooks] def charLit : Parser :=
withAntiquot (mkAntiquot "charLit" charLitKind) charLitNoAntiquot
@[runBuiltinParserAttributeHooks] def nameLit : Parser :=
withAntiquot (mkAntiquot "nameLit" nameLitKind) nameLitNoAntiquot
@[runBuiltinParserAttributeHooks, inline] def group (p : Parser) : Parser :=
node groupKind p
@[runBuiltinParserAttributeHooks, inline] def many1Indent (p : Parser) : Parser :=
withPosition $ many1 (checkColGe "irrelevant" >> p)
@[runBuiltinParserAttributeHooks, inline] def manyIndent (p : Parser) : Parser :=
withPosition $ many (checkColGe "irrelevant" >> p)
@[runBuiltinParserAttributeHooks] abbrev notSymbol (s : String) : Parser :=
notFollowedBy (symbol s) s
/-- No-op parser that advises the pretty printer to emit a non-breaking space. -/
@[inline] def ppHardSpace : Parser := skip
/-- No-op parser that advises the pretty printer to emit a space/soft line break. -/
@[inline] def ppSpace : Parser := skip
/-- No-op parser that advises the pretty printer to emit a hard line break. -/
@[inline] def ppLine : Parser := skip
/-- No-op parser combinator that advises the pretty printer to emit a `Format.fill` node. -/
@[inline] def ppRealFill : Parser → Parser := id
/-- No-op parser combinator that advises the pretty printer to emit a `Format.group` node. -/
@[inline] def ppRealGroup : Parser → Parser := id
/-- No-op parser combinator that advises the pretty printer to indent the given syntax without grouping it. -/
@[inline] def ppIndent : Parser → Parser := id
/--
No-op parser combinator that advises the pretty printer to group and indent the given syntax.
By default, only syntax categories are grouped. -/
@[inline] def ppGroup (p : Parser) : Parser := ppRealFill (ppIndent p)
/--
No-op parser combinator that advises the pretty printer to dedent the given syntax.
Dedenting can in particular be used to counteract automatic indentation. -/
@[inline] def ppDedent : Parser → Parser := id
/--
No-op parser combinator that allows the pretty printer to omit the group and
indent operation in the enclosing category parser.
```
syntax ppAllowUngrouped "by " tacticSeq : term
-- allows a `by` after `:=` without linebreak in between:
theorem foo : True := by
trivial
```
-/
@[inline] def ppAllowUngrouped : Parser := skip
/--
No-op parser combinator that advises the pretty printer to dedent the given syntax,
if it was grouped by the category parser.
Dedenting can in particular be used to counteract automatic indentation. -/
@[inline] def ppDedentIfGrouped : Parser → Parser := id
/--
No-op parser combinator that prints a line break.
The line break is soft if the combinator is followed
by an ungrouped parser (see ppAllowUngrouped), otherwise hard. -/
@[inline] def ppHardLineUnlessUngrouped : Parser := skip
end Parser
section
open PrettyPrinter
@[combinatorFormatter Lean.Parser.ppHardSpace] def ppHardSpace.formatter : Formatter := Formatter.pushWhitespace " "
@[combinatorFormatter Lean.Parser.ppSpace] def ppSpace.formatter : Formatter := Formatter.pushLine
@[combinatorFormatter Lean.Parser.ppLine] def ppLine.formatter : Formatter := Formatter.pushWhitespace "\n"
@[combinatorFormatter Lean.Parser.ppRealFill] def ppRealFill.formatter (p : Formatter) : Formatter := Formatter.fill p
@[combinatorFormatter Lean.Parser.ppRealGroup] def ppRealGroup.formatter (p : Formatter) : Formatter := Formatter.group p
@[combinatorFormatter Lean.Parser.ppIndent] def ppIndent.formatter (p : Formatter) : Formatter := Formatter.indent p
@[combinatorFormatter Lean.Parser.ppDedent] def ppDedent.formatter (p : Formatter) : Formatter := do
let opts ← getOptions
Formatter.indent p (some ((0:Int) - Std.Format.getIndent opts))
@[combinatorFormatter Lean.Parser.ppAllowUngrouped] def ppAllowUngrouped.formatter : Formatter := do
modify ({ · with mustBeGrouped := false })
@[combinatorFormatter Lean.Parser.ppDedentIfGrouped] def ppDedentIfGrouped.formatter (p : Formatter) : Formatter := do
Formatter.concat p
let indent := Std.Format.getIndent (← getOptions)
unless (← get).isUngrouped do
modify fun st => { st with stack := st.stack.modify (st.stack.size - 1) (·.nest (0 - indent)) }
@[combinatorFormatter Lean.Parser.ppHardLineUnlessUngrouped] def ppHardLineUnlessUngrouped.formatter : Formatter := do
if (← get).isUngrouped then
Formatter.pushLine
else
ppLine.formatter
end
namespace Parser
-- now synthesize parenthesizers
attribute [runBuiltinParserAttributeHooks]
ppHardSpace ppSpace ppLine ppGroup ppRealGroup ppRealFill ppIndent ppDedent
ppAllowUngrouped ppDedentIfGrouped ppHardLineUnlessUngrouped
macro "register_parser_alias" aliasName?:optional(strLit) declName:ident : term =>
let aliasName := aliasName?.getD (Syntax.mkStrLit declName.getId.toString)
`(do Parser.registerAlias $aliasName $declName
PrettyPrinter.Formatter.registerAlias $aliasName $(mkIdentFrom declName (declName.getId ++ `formatter))
PrettyPrinter.Parenthesizer.registerAlias $aliasName $(mkIdentFrom declName (declName.getId ++ `parenthesizer)))
builtin_initialize
register_parser_alias group
register_parser_alias ppHardSpace
register_parser_alias ppSpace
register_parser_alias ppLine
register_parser_alias ppGroup
register_parser_alias ppRealGroup
register_parser_alias ppRealFill
register_parser_alias ppIndent
register_parser_alias ppDedent
register_parser_alias ppAllowUngrouped
register_parser_alias ppDedentIfGrouped
register_parser_alias ppHardLineUnlessUngrouped
end Parser
end Lean