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a3698041 AC |
1 | (* HCoop Domtool (http://hcoop.sourceforge.net/) |
2 | * Copyright (c) 2006, Adam Chlipala | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
dac62e84 | 17 | *) |
a3698041 AC |
18 | |
19 | (* Execution of Domtool programs reduced to primitive actions *) | |
20 | ||
21 | structure Eval :> EVAL = struct | |
22 | ||
23 | open Ast | |
24 | ||
25 | structure SM = StringMap | |
26 | ||
27 | fun lookup (evs, ev) = | |
28 | case SM.find (evs, ev) of | |
29 | NONE => raise Fail ("Couldn't find an environment variable " | |
30 | ^ ev ^ " that type-checking has guaranteed") | |
31 | | SOME v => v | |
32 | ||
8a7c40fa AC |
33 | fun printEvs (name, evs) = |
34 | (print ("Environment " ^ name ^ "\n"); | |
35 | SM.appi (fn (name, i) => Print.preface (name, Print.p_exp i)) evs; | |
36 | print "\n") | |
37 | ||
a3698041 AC |
38 | val conjoin : Env.env_vars * Env.env_vars -> Env.env_vars = |
39 | SM.unionWith #2 | |
40 | ||
41 | fun findPrimitive e = | |
42 | let | |
43 | fun findPrim (e, _) = | |
44 | case e of | |
45 | EVar name => (name, []) | |
46 | | EApp (e1, e2) => | |
47 | let | |
48 | val (name, args) = findPrim e1 | |
49 | in | |
50 | (name, e2 :: args) | |
51 | end | |
52 | | _ => raise Fail "Non-primitive action left after reduction" | |
53 | ||
54 | val (name, args) = findPrim e | |
55 | in | |
56 | (name, rev args) | |
57 | end | |
58 | ||
1824f573 AC |
59 | fun exec' evs (eAll as (e, _)) = |
60 | case e of | |
61 | ESkip => SM.empty | |
62 | | ESet (ev, e) => SM.insert (SM.empty, ev, e) | |
a356587a AC |
63 | | EGet (x, _, ev, e) => |
64 | let | |
65 | val e' = Reduce.subst x (lookup (evs, ev)) e | |
66 | in | |
67 | exec' evs (Reduce.reduceExp Env.empty e') | |
68 | end | |
1824f573 AC |
69 | | ESeq es => |
70 | let | |
71 | val (new, _) = | |
72 | foldl (fn (e, (new, keep)) => | |
73 | let | |
74 | val new' = exec' keep e | |
75 | in | |
76 | (conjoin (new, new'), | |
77 | conjoin (keep, new')) | |
78 | end) (SM.empty, evs) es | |
79 | in | |
80 | new | |
81 | end | |
82 | | ELocal (e1, e2) => | |
83 | let | |
84 | val evs' = exec' evs e1 | |
1824f573 | 85 | in |
e47271a1 | 86 | exec' (conjoin (evs, evs')) e2 |
1824f573 AC |
87 | end |
88 | | EWith (e1, e2) => | |
89 | let | |
90 | val (prim, args) = findPrimitive e1 | |
91 | in | |
92 | case Env.container prim of | |
93 | NONE => raise Fail "Unbound primitive container" | |
94 | | SOME (action, cleanup) => | |
a3698041 | 95 | let |
1824f573 AC |
96 | val evs' = action (evs, args) |
97 | val evs'' = exec' evs e2 | |
a3698041 | 98 | in |
1824f573 AC |
99 | cleanup (); |
100 | evs' | |
a3698041 | 101 | end |
1824f573 | 102 | end |
a3698041 | 103 | |
1824f573 AC |
104 | | _ => |
105 | let | |
106 | val (prim, args) = findPrimitive eAll | |
107 | in | |
108 | case Env.action prim of | |
109 | NONE => raise Fail "Unbound primitive action" | |
b0963032 | 110 | | SOME action => action (evs, List.map (Reduce.reduceExp Env.empty) args) |
1824f573 | 111 | end |
a3698041 | 112 | |
1824f573 AC |
113 | fun exec evs e = |
114 | let | |
e0b0abd2 | 115 | val _ = Env.pre () |
a3698041 AC |
116 | val evs' = exec' evs e |
117 | in | |
e0b0abd2 | 118 | Env.post () |
a3698041 AC |
119 | end |
120 | ||
24248d62 AC |
121 | val exec' = fn evs => fn e => conjoin (evs, exec' evs e) |
122 | ||
a3698041 | 123 | end |