(* Title: Pure/section_utils.ML
ID: $Id$
Author: Lawrence C Paulson, Cambridge University Computer Laboratory
Copyright 1994 University of Cambridge
Utilities for writing new theory sections.
*)
fun ap t u = t$u;
fun app t (u1,u2) = t $ u1 $ u2;
(*Make distinct individual variables a1, a2, a3, ..., an. *)
fun mk_frees a [] = []
| mk_frees a (T::Ts) = Free(a,T) :: mk_frees (bump_string a) Ts;
(*Read an assumption in the given theory*)
fun assume_read thy a = Thm.assume (read_cterm (Theory.sign_of thy) (a,propT));
(*Read a term from string "b", with expected type T*)
fun readtm sign T b =
read_cterm sign (b,T) |> term_of
handle ERROR => error ("The error(s) above occurred for " ^ b);
(*From HOL/ex/meson.ML: raises exception if no rules apply -- unlike RL*)
fun tryres (th, rl::rls) = (th RS rl handle THM _ => tryres(th,rls))
| tryres (th, []) = raise THM("tryres", 0, [th]);
fun gen_make_elim elim_rls rl =
standard (tryres (rl, elim_rls @ [revcut_rl]));
(** String manipulation **)
(*Skipping initial blanks, find the first identifier*) (* FIXME *)
fun scan_to_id s =
s |> Symbol.explode
|> Scan.error (Scan.finite Symbol.stopper
(!! (fn _ => "Expected to find an identifier in " ^ s)
(Scan.any Symbol.is_blank |-- Syntax.scan_id)))
|> #1;
fun is_backslash c = c = "\\";