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[smlnj] Annotation of /sml/trunk/src/cm/semant/semant.sml
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Annotation of /sml/trunk/src/cm/semant/semant.sml

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1 : blume 267 (*
2 :     * semantic actions to go with the grammar for CM description files
3 :     *
4 :     * (C) 1999 Lucent Technologies, Bell Laboratories
5 :     *
6 :     * Author: Matthias Blume (blume@kurims.kyoto-u.ac.jp)
7 :     *)
8 : blume 265 signature CM_SEMANT = sig
9 :    
10 : blume 270 type context = AbsPath.context
11 : blume 268 type pathname = AbsPath.t
12 : blume 265 type ml_symbol
13 :     type cm_symbol
14 :    
15 :     type group
16 :    
17 : blume 266 type perms
18 : blume 275 type permspec
19 : blume 265 type aexp
20 :     type exp
21 :     type members (* still conditional *)
22 :     type exports (* still conditional *)
23 :    
24 : blume 266 type complainer = string -> unit
25 :    
26 : blume 267 (* getting elements of primitive types (pathnames and symbols) *)
27 : blume 270 val file_native : string * context -> pathname
28 :     val file_standard : string * context -> pathname
29 : blume 265 val cm_symbol : string -> cm_symbol
30 :     val ml_structure : string -> ml_symbol
31 :     val ml_signature : string -> ml_symbol
32 :     val ml_functor : string -> ml_symbol
33 :     val ml_funsig : string -> ml_symbol
34 :    
35 : blume 270 (* getting the full analysis for a group/library *)
36 : blume 274 val emptyGroup : group
37 : blume 275 val group : permspec * exports * members -> group
38 :     val library : permspec * exports * members -> group
39 : blume 265
40 : blume 267 (* assembling permission lists *)
41 : blume 275 val initialPermSpec : permspec
42 :     val require : permspec * cm_symbol * complainer -> permspec
43 :     val grant : permspec * cm_symbol * complainer -> permspec
44 : blume 265
45 : blume 267 (* constructing member collections *)
46 : blume 265 val emptyMembers : members
47 : blume 270 val member : (pathname -> group)
48 : blume 275 -> { sourcepath: pathname, group: pathname, class: cm_symbol option,
49 :     error: string -> unit }
50 : blume 270 -> members
51 : blume 265 val members : members * members -> members
52 : blume 275 val guarded_members :
53 :     exp * (members * members) * (string -> unit) -> members
54 :     val error_member : (unit -> unit) -> members
55 : blume 265
56 : blume 267 (* constructing export lists *)
57 : blume 265 val emptyExports : exports
58 :     val export : ml_symbol -> exports
59 :     val exports : exports * exports -> exports
60 : blume 275 val guarded_exports :
61 :     exp * (exports * exports) * (string -> unit) -> exports
62 :     val error_export : (unit -> unit) -> exports
63 : blume 265
64 : blume 267 (* arithmetic (number-valued) expression *)
65 : blume 265 val number : int -> aexp
66 :     val variable : cm_symbol -> aexp
67 :     val plus : aexp * aexp -> aexp
68 :     val minus : aexp * aexp -> aexp
69 :     val times : aexp * aexp -> aexp
70 :     val divide : aexp * aexp -> aexp
71 :     val modulus : aexp * aexp -> aexp
72 :     val negate : aexp -> aexp
73 :    
74 : blume 267 (* (bool-valued) expressions *)
75 : blume 265 val ml_defined : ml_symbol -> exp
76 :     val cm_defined : cm_symbol -> exp
77 :     val conj : exp * exp -> exp
78 :     val disj : exp * exp -> exp
79 :     val beq : exp * exp -> exp
80 :     val bne : exp * exp -> exp
81 :     val not : exp -> exp
82 :     val lt : aexp * aexp -> exp
83 :     val le : aexp * aexp -> exp
84 :     val gt : aexp * aexp -> exp
85 :     val ge : aexp * aexp -> exp
86 :     val eq : aexp * aexp -> exp
87 :     val ne : aexp * aexp -> exp
88 :     end
89 :    
90 :     structure CMSemant :> CM_SEMANT = struct
91 :    
92 : blume 267 structure Symbol = GenericVC.Symbol
93 :     structure SymPath = GenericVC.SymPath
94 :    
95 : blume 265 type pathname = AbsPath.t
96 : blume 270 type context = AbsPath.context
97 : blume 267 type ml_symbol = Symbol.symbol
98 : blume 265 type cm_symbol = string
99 :    
100 : blume 270 type group = Dummy.t
101 : blume 265
102 : blume 268 type environment = MemberCollection.collection
103 : blume 265
104 : blume 275 type perms = StringSet.set
105 :     type permspec = { required : perms, granted : perms }
106 : blume 265
107 :     type aexp = environment -> int
108 :     type exp = environment -> bool
109 : blume 267 type members = environment -> MemberCollection.collection
110 :     type exports = environment -> SymbolSet.set
111 : blume 265
112 : blume 266 type complainer = string -> unit
113 :    
114 : blume 275 fun saveEval (exp, env, error) =
115 : blume 267 exp env
116 :     handle exn =>
117 : blume 275 (error ("expression raises exception: " ^ General.exnMessage exn);
118 :     false)
119 : blume 267
120 : blume 265 fun file_native (s, d) = AbsPath.native { context = d, spec = s }
121 :     fun file_standard (s, d) = AbsPath.standard { context = d, spec = s }
122 :     fun cm_symbol s = s
123 : blume 267 val ml_structure = Symbol.strSymbol
124 :     val ml_signature = Symbol.sigSymbol
125 :     val ml_functor = Symbol.fctSymbol
126 :     val ml_funsig = Symbol.fsigSymbol
127 : blume 265
128 : blume 274 val emptyGroup = Dummy.v
129 : blume 275 fun group (p: permspec, e: exports, m: members) =
130 : blume 274 (ignore (m MemberCollection.empty);
131 :     Dummy.v)
132 : blume 275 fun library (p: permspec, e: exports, m: members) =
133 : blume 274 (ignore (m MemberCollection.empty);
134 :     Dummy.v)
135 : blume 265
136 : blume 266 local
137 : blume 267 val isMember = StringSet.member
138 : blume 266 fun sanity ({ required, granted }, s, error) =
139 : blume 267 if isMember (required, s) orelse isMember (granted, s) then
140 : blume 266 error ("duplicate permission name: " ^ s)
141 :     else ()
142 :     in
143 : blume 275 val initialPermSpec = { required = StringSet.empty,
144 : blume 266 granted = StringSet.empty }
145 :     fun require (a as ({ required, granted }, s, _)) =
146 :     (sanity a;
147 :     { required = StringSet.add (required, s), granted = granted })
148 :     fun grant (a as ({ required, granted }, s, _)) =
149 :     (sanity a;
150 :     { required = required, granted = StringSet.add (granted, s) })
151 :     end
152 : blume 265
153 : blume 270 (* get the export map from a group *)
154 : blume 274 fun getExports (g: group) = (ignore Dummy.v; SymbolMap.empty)
155 : blume 270
156 : blume 268 fun emptyMembers env = env
157 : blume 270 fun member rparse arg env = let
158 :     val coll = MemberCollection.expandOne (getExports o rparse) arg
159 : blume 275 val error = #error arg
160 : blume 270 in
161 : blume 275 MemberCollection.sequential (env, coll, error)
162 : blume 270 end
163 : blume 268 fun members (m1, m2) env = m2 (m1 env)
164 : blume 275 fun guarded_members (c, (m1, m2), error) env =
165 :     if saveEval (c, env, error) then m1 env else m2 env
166 :     fun error_member thunk env = (thunk (); env)
167 : blume 265
168 : blume 267 fun emptyExports env = SymbolSet.empty
169 :     fun export s env = SymbolSet.singleton s
170 :     fun exports (e1, e2) env = SymbolSet.union (e1 env, e2 env)
171 : blume 275 fun guarded_exports (c, (e1, e2), error) env =
172 :     if saveEval (c, env, error) then e1 env else e2 env
173 :     fun error_export thunk env = (thunk (); SymbolSet.empty)
174 : blume 265
175 :     fun number i _ = i
176 : blume 267 fun variable v e = MemberCollection.num_look e v
177 : blume 265 fun plus (e1, e2) e = e1 e + e2 e
178 :     fun minus (e1, e2) e = e1 e - e2 e
179 :     fun times (e1, e2) e = e1 e * e2 e
180 :     fun divide (e1, e2) e = e1 e div e2 e
181 :     fun modulus (e1, e2) e = e1 e mod e2 e
182 :     fun negate ex e = ~(ex e)
183 :    
184 : blume 267 fun ml_defined s e = MemberCollection.ml_look e s
185 :     fun cm_defined s e = MemberCollection.cm_look e s
186 : blume 265 fun conj (e1, e2) e = e1 e andalso e2 e
187 :     fun disj (e1, e2) e = e1 e orelse e2 e
188 :     fun beq (e1: exp, e2) e = e1 e = e2 e
189 :     fun bne (e1: exp, e2) e = e1 e <> e2 e
190 :     fun not ex e = Bool.not (ex e)
191 :     fun lt (e1, e2) e = e1 e < e2 e
192 :     fun le (e1, e2) e = e1 e <= e2 e
193 :     fun gt (e1, e2) e = e1 e > e2 e
194 :     fun ge (e1, e2) e = e1 e >= e2 e
195 :     fun eq (e1: aexp, e2) e = e1 e = e2 e
196 :     fun ne (e1: aexp, e2) e = e1 e <> e2 e
197 :     end

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