35 lines
1.2 KiB
Text
35 lines
1.2 KiB
Text
open lean.parser
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open interactive
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open tactic
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reserve prefix `unquote! `:100
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@[user_notation]
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to_expr e >>= eval_expr pexpr
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meta def unquote_macro (_ : parse $ tk "unquote!") (e : parse lean.parser.pexpr) : parser pexpr :=
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#eval unquote! ``(1 + 1)
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private meta def parse_format : string → string → ℕ × pexpr
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| acc [] := (0, pexpr.of_expr (reflect acc))
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| acc ('{'::'{'::s) := parse_format (acc ++ "{") s
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| acc ('{'::'}'::s) :=
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let (n, f) := parse_format [] s in
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(n + 1, ``(to_fmt %%(reflect acc) ++ to_fmt %%(expr.var n : pexpr) ++ %%f))
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| acc (c::s) := parse_format (acc ++ [c]) s
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reserve prefix `format! `:100
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@[user_notation]
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meta def format_macro (_ : parse $ tk "format!") (s : string) : tactic pexpr :=
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let (n, f) := parse_format "" s.reverse in
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pure $ n.repeat (λ _ e, expr.lam `_ binder_info.default pexpr.mk_placeholder e) f
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#eval format! "a{}c" "b"
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-- #eval format! "{} {}" "a" "bla" -- TODO: delayed abstractions issue
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reserve infix ` +⋯+ `:65
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@[user_notation]
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do n₁ ← to_expr e₁ >>= eval_expr nat,
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meta def upto_notation (e₁ : parse lean.parser.pexpr) (_ : parse $ tk "+⋯+") (n₂ : ℕ) : parser pexpr :=
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pure $ (n₂+1-n₁).repeat (λ i e, ``(%%e + %%(reflect $ n₁ + i))) ``(0)
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#check 1 +⋯+ 10
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