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

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1 : blume 270 (*
2 :     * Parser 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 310 signature PARSE = sig
9 : blume 301 val parse :
10 : blume 355 GroupReg.groupreg option ->
11 : blume 310 GeneralParams.param -> bool option ->
12 : blume 354 SrcPath.t -> (CMSemant.group * GeneralParams.info) option
13 : blume 367 val reset : unit -> unit
14 : blume 404 val listLibs : unit -> unit
15 :     val dismissLib : SrcPath.t -> unit
16 : blume 268 end
17 :    
18 : blume 362 functor ParseFn (val pending : unit -> DependencyGraph.impexp SymbolMap.map
19 :     structure Stabilize: STABILIZE) :> PARSE = struct
20 : blume 268
21 :     val lookAhead = 30
22 :    
23 :     structure S = GenericVC.Source
24 :     structure EM = GenericVC.ErrorMsg
25 :     structure SM = GenericVC.SourceMap
26 : blume 348 structure GG = GroupGraph
27 : blume 268
28 :     structure CMLrVals = CMLrValsFun (structure Token = LrParser.Token)
29 :     structure CMLex = CMLexFun (structure Tokens = CMLrVals.Tokens)
30 :     structure CMParse =
31 :     JoinWithArg (structure ParserData = CMLrVals.ParserData
32 :     structure Lex = CMLex
33 :     structure LrParser = LrParser)
34 :    
35 : blume 367 (* the "stable group cache" *)
36 :     val sgc = ref (SrcPathMap.empty: CMSemant.group SrcPathMap.map)
37 :     fun reset () = sgc := SrcPathMap.empty
38 :    
39 : blume 404 fun listLibs () = let
40 :     fun show (sp, _) =
41 :     Say.say [SrcPath.descr sp, "\n"]
42 :     in
43 :     SrcPathMap.appi show (!sgc)
44 :     end
45 :    
46 :     fun dismissLib l =
47 :     (sgc := #1 (SrcPathMap.remove (!sgc, l)))
48 :     handle LibBase.NotFound => ()
49 :    
50 : blume 355 fun parse gropt param stabflag group = let
51 : blume 270
52 : blume 311 val stabthis = isSome stabflag
53 :     val staball = stabflag = SOME true
54 : blume 310
55 : blume 355 val groupreg =
56 :     case gropt of
57 :     SOME r => r
58 :     | NONE => GroupReg.new ()
59 : blume 309 val errcons = EM.defaultConsumer ()
60 :     val ginfo = { param = param, groupreg = groupreg, errcons = errcons }
61 : blume 268
62 : blume 301 (* The "group cache" -- we store "group options"; having
63 :     * NONE registered for a group means that a previous attempt
64 :     * to parse it had failed. *)
65 : blume 354 val gc = ref (SrcPathMap.empty: CMSemant.group option SrcPathMap.map)
66 : blume 273
67 : blume 367 fun mparse (group, groupstack, pErrFlag, stabthis, curlib) =
68 :     case SrcPathMap.find (!sgc, group) of
69 :     SOME g => SOME g
70 :     | NONE =>
71 :     (case SrcPathMap.find (!gc, group) of
72 :     SOME gopt => gopt
73 :     | NONE => let
74 :     fun cache_nonstable gopt =
75 :     (gc := SrcPathMap.insert (!gc, group, gopt);
76 :     gopt)
77 :     fun cache_stable g =
78 :     (sgc := SrcPathMap.insert (!sgc, group, g);
79 :     SOME g)
80 :     fun isStable (GG.GROUP { kind, ... }) =
81 : blume 398 case kind of GG.STABLELIB => true | _ => false
82 : blume 367 val pres =
83 :     parse' (group, groupstack, pErrFlag,
84 :     stabthis, curlib)
85 :     in
86 :     case pres of
87 :     NONE => cache_nonstable NONE
88 :     | SOME g =>
89 :     if isStable g then cache_stable g
90 :     else cache_nonstable (SOME g)
91 :     end)
92 : blume 273
93 : blume 367 and parse' (group, groupstack, pErrFlag, stabthis, curlib) = let
94 : blume 286 (* checking for cycles among groups and printing them nicely *)
95 : blume 294 fun findCycle ([], _) = []
96 :     | findCycle ((h as (g, (s, p1, p2))) :: t, cyc) =
97 : blume 354 if SrcPath.compare (g, group) = EQUAL then rev (h :: cyc)
98 : blume 294 else findCycle (t, h :: cyc)
99 :     fun report ((g, (s, p1, p2)), hist) = let
100 :     fun pphist pps = let
101 :     fun loop (_, []) = ()
102 :     | loop (g0, (g, (s, p1, p2)) :: t) = let
103 :     val s = EM.matchErrorString s (p1, p2)
104 :     in
105 :     PrettyPrint.add_string pps s;
106 :     PrettyPrint.add_string pps ": importing ";
107 : blume 354 PrettyPrint.add_string pps (SrcPath.specOf g0);
108 : blume 294 PrettyPrint.add_newline pps;
109 :     loop (g, t)
110 :     end
111 : blume 273 in
112 : blume 294 PrettyPrint.add_newline pps;
113 :     loop (g, hist)
114 : blume 273 end
115 :     in
116 : blume 294 EM.error s (p1, p2) EM.COMPLAIN
117 :     ("group hierarchy forms a cycle with " ^
118 : blume 354 SrcPath.specOf group)
119 : blume 294 pphist
120 : blume 273 end
121 :    
122 : blume 310 fun getStable gpath = let
123 : blume 330 fun getStableSG p =
124 : blume 367 mparse (p, groupstack, pErrFlag, staball, SOME gpath)
125 : blume 310 in
126 : blume 398 Stabilize.loadStable ginfo { getGroup = getStableSG,
127 :     anyerrors = pErrFlag } gpath
128 : blume 310 end
129 :    
130 : blume 340 (* We stabilize libraries only because a stable library will
131 :     * encompass the contents of its sub-groups
132 :     * (but not sub-libraries!). *)
133 : blume 348 fun stabilize (g as GG.GROUP { kind = GG.NOLIB, ... }) = SOME g
134 : blume 340 | stabilize g =
135 : blume 311 Stabilize.stabilize ginfo { group = g, anyerrors = pErrFlag }
136 : blume 310
137 : blume 294 (* normal processing -- used when there is no cycle to report *)
138 :     fun normal_processing () = let
139 : blume 354 val context = SrcPath.sameDirContext group
140 : blume 294
141 : blume 345 fun work stream = let
142 :     val source =
143 : blume 354 S.newSource (SrcPath.osstring group,
144 :     1, stream, false, errcons)
145 : blume 345 val sourceMap = #sourceMap source
146 :     val _ = GroupReg.register groupreg (group, source)
147 : blume 297
148 : blume 345 (* We can hard-wire the source into this
149 :     * error function because the function is only for
150 :     * immediate use and doesn't get stored into persistent
151 :     * data structures. *)
152 :     fun error r m =
153 :     EM.error source r EM.COMPLAIN m EM.nullErrorBody
154 : blume 397 fun obsolete r =
155 : blume 433 if #get StdConfig.warn_obsolete () then
156 : blume 397 EM.error source r EM.WARN
157 :     "old-style operator (obsolete)" EM.nullErrorBody
158 :     else ()
159 : blume 294
160 : blume 345 (* recParse returns a group (not an option).
161 : blume 380 * This function is used to parse sub-groups.
162 : blume 345 * Errors are propagated by explicitly setting the
163 :     * "anyErrors" flag of the parent group. *)
164 : blume 367 fun recParse (p1, p2) curlib p = let
165 :     val gs' = (group, (source, p1, p2)) :: groupstack
166 : blume 345 val myErrorFlag = #anyErrors source
167 : blume 294 in
168 : blume 367 case mparse (p, gs', myErrorFlag, staball, curlib) of
169 : blume 345 NONE => (myErrorFlag := true;
170 :     CMSemant.emptyGroup group)
171 :     | SOME res => res
172 : blume 294 end
173 : blume 345 handle exn as IO.Io _ =>
174 :     (error (p1, p2) (General.exnMessage exn);
175 :     CMSemant.emptyGroup group)
176 :    
177 :     fun doMember (p, p1, p2, c) =
178 :     CMSemant.member (ginfo, recParse (p1, p2))
179 :     { sourcepath = p, class = c,
180 :     group = (group, (p1, p2)) }
181 :    
182 :     (* Build the argument for the lexer; the lexer's local
183 :     * state is encapsulated here to make sure the parser
184 :     * is re-entrant. *)
185 :     val lexarg = let
186 :     (* local state *)
187 :     val depth = ref 0
188 :     val curstring = ref []
189 :     val startpos = ref 0
190 :     val instring = ref false
191 :     (* handling comments *)
192 :     fun enterC () = depth := !depth + 1
193 :     fun leaveC () = let
194 :     val d = !depth - 1
195 :     in
196 :     depth := d;
197 :     d = 0
198 :     end
199 :     (* handling strings *)
200 :     fun newS pos =
201 :     (instring := true;
202 :     curstring := [];
203 :     startpos := pos)
204 :     fun addS c = curstring := c :: !curstring
205 :     fun addSC (s, offs) =
206 :     addS (chr (ord (String.sub (s, 2)) - offs))
207 :     fun addSN (s, pos) = let
208 :     val ns = substring (s, 1, 3)
209 :     val n = Int.fromString ns
210 :     in
211 :     addS (chr (valOf n))
212 :     handle _ =>
213 :     error (pos, pos + size s)
214 :     ("illegal decimal char spec: " ^ ns)
215 :     end
216 :     fun getS (pos, tok) =
217 :     (instring := false;
218 :     tok (implode (rev (!curstring)), !startpos, pos))
219 :     (* handling EOF *)
220 :     fun handleEof () = let
221 :     val pos = SM.lastChange sourceMap
222 :     in
223 :     if !depth > 0 then
224 :     error (pos, pos)
225 :     "unexpected end of input in comment"
226 :     else if !instring then
227 :     error (pos, pos)
228 :     "unexpected end of input in string"
229 :     else ();
230 :     pos
231 :     end
232 :     (* handling line breaks *)
233 :     fun newline pos = SM.newline sourceMap pos
234 :     (* handling #line directives *)
235 :     fun sync (p, t) = let
236 :     fun sep c = c = #"#" orelse Char.isSpace c
237 :     fun cvt s = getOpt (Int.fromString s, 0)
238 :     fun r (line, col, file) = SM.resynch sourceMap
239 :     (p, { fileName = file,
240 :     line = line, column = col })
241 :     in
242 :     case String.tokens sep t of
243 :     [_, line] =>
244 :     r (cvt line, NONE, NONE)
245 :     | [_, line, file] =>
246 :     r (cvt line, NONE, SOME file)
247 :     | [_, line, col, file] =>
248 :     r (cvt line, SOME (cvt col), SOME file)
249 :     | _ => error (p, p + size t)
250 :     "illegal #line directive"
251 :     end
252 : blume 294 in
253 : blume 345 { enterC = enterC,
254 :     leaveC = leaveC,
255 :     newS = newS,
256 :     addS = addS,
257 :     addSC = addSC,
258 :     addSN = addSN,
259 :     getS = getS,
260 :     handleEof = handleEof,
261 :     newline = newline,
262 : blume 397 obsolete = obsolete,
263 : blume 345 error = error,
264 :     sync = sync}
265 : blume 294 end
266 : blume 345
267 :     fun inputc k = TextIO.input stream
268 :    
269 :     val lexer = CMLex.makeLexer inputc lexarg
270 :     val tokenStream = LrParser.Stream.streamify lexer
271 :     val (parseResult, _) =
272 :     CMParse.parse (lookAhead, tokenStream,
273 :     fn (s,p1,p2) => error (p1, p2) s,
274 : blume 397 (group, context, obsolete, error,
275 : blume 367 doMember, curlib, ginfo))
276 : blume 294 in
277 : blume 345 if !(#anyErrors source) then NONE
278 :     else SOME parseResult
279 : blume 294 end
280 : blume 364 fun openIt () = TextIO.openIn (SrcPath.osstring group)
281 : blume 345 val pro =
282 : blume 364 SafeIO.perform { openIt = openIt,
283 : blume 345 closeIt = TextIO.closeIn,
284 :     work = work,
285 :     cleanup = fn () => () }
286 : blume 268 in
287 : blume 345 case pro of
288 :     NONE => NONE
289 :     | SOME pr =>
290 :     if stabthis then stabilize pr
291 :     else SOME pr
292 : blume 268 end
293 : blume 294 handle LrParser.ParseError => NONE
294 : blume 268 in
295 : blume 294 case findCycle (groupstack, []) of
296 :     h :: t => (report (h, t); NONE)
297 : blume 310 | [] =>
298 :     (case getStable group of
299 : blume 364 NONE =>
300 :     (Say.vsay ["[scanning ", SrcPath.descr group,
301 :     "]\n"];
302 :     normal_processing ())
303 :     | SOME g =>
304 :     (Say.vsay ["[library ", SrcPath.descr group,
305 :     " is stable]\n"];
306 :     SOME g))
307 : blume 268 end
308 :     in
309 : blume 367 case mparse (group, [], ref false, stabthis, NONE) of
310 : blume 303 NONE => NONE
311 : blume 387 | SOME g => let
312 :     val reach1 = Reachable.reachable g
313 :     val reach2 = Reachable.reachable' (pending ())
314 :     val reach = SrcPathSet.union (reach1, reach2)
315 :     in
316 :     SmlInfo.forgetAllBut reach;
317 :     SOME (g, ginfo)
318 :     end
319 : blume 274 end
320 : blume 268 end

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