lean4-htt/tests/lean/run/Reparen.lean
2020-07-10 07:42:26 -07:00

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/-! Reprint file after removing all parentheses and then passing it through the parenthesizer -/
import Lean.PrettyPrinter.Parenthesizer
open Lean
open Lean.Elab
open Lean.Elab.Term
open Lean.Format
def Substring.beq (ss1 ss2 : Substring) : Bool :=
ss1.toString == ss2.toString
instance : HasBeq Substring := ⟨Substring.beq⟩
partial def Lean.Syntax.structEq : Syntax → Syntax → Bool
| Syntax.missing, Syntax.missing => true
| Syntax.node k args, Syntax.node k' args' => k == k' && args.isEqv args' Lean.Syntax.structEq
| Syntax.atom _ val, Syntax.atom _ val' => val == val'
| Syntax.ident _ rawVal val preresolved, Syntax.ident _ rawVal' val' preresolved' => rawVal == rawVal' && val == val' && preresolved == preresolved'
| _, _ => false
instance : HasBeq Lean.Syntax := ⟨Lean.Syntax.structEq⟩
def unparenAux (parens body : Syntax) : Syntax :=
match parens.getHeadInfo, body.getHeadInfo, body.getTailInfo, parens.getTailInfo with
| some bi', some bi, some ti, some ti' => (body.setHeadInfo { bi with leading := bi'.leading }).setTailInfo { ti with trailing := ti'.trailing }
| _, _, _, _ => body
partial def unparen : Syntax → Syntax
-- don't remove parentheses in syntax quotation, they might be semantically significant
| stx => if stx.isOfKind `Lean.Parser.Term.stxQuot then stx
else match_syntax stx with
| `(($stx')) => unparenAux stx $ unparen stx'
| `(level|($stx')) => unparenAux stx $ unparen stx'
| _ => stx.modifyArgs $ Array.map unparen
unsafe def main (args : List String) : IO Unit := do
let (debug, f) : Bool × String := match args with
| [f, "-d"] => (true, f)
| [f] => (false, f)
| _ => panic! "usage: file [-d]";
initSearchPath none;
withImportModules [{module := `Lean.Parser}] 0 fun env => do
stx ← Lean.Parser.parseFile env args.head!;
let header := stx.getArg 0;
some s ← pure header.reprint | throw $ IO.userError "header reprint failed";
IO.print s;
let cmds := stx.getArgs.extract 1 stx.getArgs.size;
cmds.forM $ fun cmd => do
let cmd := unparen cmd;
(cmd, _) ← IO.runMeta (PrettyPrinter.parenthesizeCommand cmd)
env { opts := KVMap.insert {} `trace.PrettyPrinter.parenthesize debug };
some s ← pure cmd.reprint | throw $ IO.userError "cmd reprint failed";
IO.print s
#eval main ["../../../src/Init/Core.lean"]