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View of /branches/vis15/src/compiler/typechecker/check-params.sml

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Revision 3409 - (download) (annotate)
Wed Nov 11 22:38:14 2015 UTC (4 years, 11 months ago) by jhr
File size: 1011 byte(s)
working on merge
(* check-params.sml
 * This code is part of the Diderot Project (http://diderot-language.cs.uchicago.edu)
 * COPYRIGHT (c) 2015 The University of Chicago
 * All rights reserved.

structure CheckParams : sig

  (* check a list of function or strand parameters *)
    val check : Env.t * Env.context * Var.kind * ParseTree.param list -> Var.t list * Env.t

  end = struct

    structure PT = ParseTree

    fun check (env, cxt, kind, params) = let
	  fun chkParam (env, cxt, param) = (case param
		 of PT.P_Mark m => chkParam (Env.withEnvAndContext (env, cxt, m))
		  | PT.P_Param(ty, {span, tree=x}) => let
		      val x' = Var.new(
			    x, Error.location(#1 cxt, span),
			    kind, CheckType.check (env, cxt, ty))
			Env.checkForRedef (env, cxt, x);
			(x', Env.insertLocal(env, cxt, x, x'))
		(* end case *))
	  fun chk (param, (xs, env)) = let
		val (x, env) = chkParam (env, cxt, param)
		  (x::xs, env)
	    List.foldr chk ([], env) params


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