2823bebd23
This allows efficient recovery from a parse error as well as implementing `has_to_string` for `message`
44 lines
1.1 KiB
Text
44 lines
1.1 KiB
Text
import init.lean.parser.reader.module system.io
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open lean.parser
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open lean.parser.reader
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def show_result (p : lean.parser.reader) (s : string) : io unit :=
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match p.parse ⟨⟩ s with
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| except.ok stx := do
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guard $ stx.reprint = s,
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io.print_ln "result: ",
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io.print_ln (to_string stx)
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| except.error e := do
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io.print_ln e,
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io.print_ln "partial syntax tree:",
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io.print_ln (to_string e.custom)
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#eval show_result module.reader "prelude"
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#eval show_result module.reader "import me"
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#eval show_result module.reader "importme"
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#eval show_result module.reader "prelude
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import ..a b
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import c"
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#eval show_result module.reader "open me you"
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#eval show_result module.reader "open me as you (a b c) (renaming a->b c->d) (hiding a b)"
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#eval show_result module.reader "open me you."
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#eval show_result module.reader "open a
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section b
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open c
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section d
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open e
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end d
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end b"
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-- should not be a reader error
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#eval show_result module.reader "section a end"
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#eval show_result module.reader "notation `Prop` := _"
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-- slowly progressing...
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#eval do
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s ← io.fs.read_file "../../library/init/core.lean",
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show_result module.reader s
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