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

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