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[smlnj] Annotation of /sml/trunk/src/cm/paths/srcpath.sml
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Annotation of /sml/trunk/src/cm/paths/srcpath.sml

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1 : blume 354 (*
2 :     * Operations over abstract path names.
3 :     * This is the "surface" abstraction that the client actually gets to
4 :     * see. It is built on top of the "AbsPath" abstraction, but its
5 :     * important improvement over AbsPath is that the ordering relation
6 :     * is stable: once you have created two "SrcPath"s, they will always
7 :     * compare the same way -- even if files are moved about, file_ids
8 :     * change, etc.
9 :     *
10 :     * Copyright (c) 1999 by Lucent Technologies, Bell Laboratories
11 :     *
12 :     * Author: Matthias Blume (blume@cs.princeton.edu)
13 :     *)
14 :     signature SRCPATH = sig
15 : blume 367
16 :     exception Format (* if something is seriously wrong with a pickle *)
17 :     exception BadAnchor of string (* if anchor cannot be resolved *)
18 :    
19 : blume 354 type context
20 :     type t
21 :     type ord_key = t
22 :    
23 :     val compare : ord_key * ord_key -> order
24 :    
25 :     (* This rebuilds the internal table in a manner consistent with
26 :     * the current state of the file system: *)
27 :     val sync : unit -> unit
28 :    
29 : blume 366 (* This makes sure CM knows what the current working directory is: *)
30 :     val revalidateCwd : unit -> unit
31 :    
32 : blume 354 (* This erases all persistent state: *)
33 :     val clear : unit -> unit
34 :    
35 :     val osstring : t -> string
36 :     val descr : t -> string
37 :     val reAnchoredName : t * string -> string option
38 :     val contextOf : t -> context
39 :     val specOf : t -> string
40 :     val contextName : context -> string
41 :     val sameDirContext : t -> context
42 : blume 366
43 :     (* This will be called at the beginning of most main operations.
44 :     * Therefore, it will automatically do the call to revalidateCwd. *)
45 : blume 354 val cwdContext : unit -> context
46 :    
47 :     val native : { context: context, spec: string } -> t
48 :     val standard : PathConfig.mode -> { context: context, spec: string } -> t
49 :    
50 :     val pickle : (bool -> unit) -> t * t -> string list
51 : blume 367 val unpickle : PathConfig.mode -> string list * t -> t
52 : blume 354
53 :     val tstamp : t -> TStamp.t
54 :     end
55 :    
56 :     structure SrcPath :> SRCPATH = struct
57 :    
58 : blume 367 exception Format = AbsPath.Format
59 :     exception BadAnchor = AbsPath.BadAnchor
60 :    
61 : blume 354 type context = AbsPath.context
62 :     type t = AbsPath.t * int
63 :     type ord_key = t
64 :    
65 :     fun compare ((_, i), (_, i')) = Int.compare (i, i')
66 :    
67 :     val knownPaths = ref (AbsPathMap.empty: int AbsPathMap.map)
68 :     val nextId = ref 0
69 :    
70 :     fun sync () =
71 :     (AbsPath.newEra ();
72 : blume 377 knownPaths :=
73 :     AbsPathMap.foldli (fn (k, v, m) => AbsPathMap.insert (m, k, v))
74 :     AbsPathMap.empty
75 :     (!knownPaths))
76 : blume 354
77 :     fun clear () = knownPaths := AbsPathMap.empty
78 :    
79 :     val revalidateCwd = AbsPath.revalidateCwd
80 :    
81 :     fun intern ap =
82 :     case AbsPathMap.find (!knownPaths, ap) of
83 :     SOME i => (ap, i)
84 :     | NONE => let
85 :     val i = !nextId
86 :     in
87 :     nextId := i + 1;
88 :     knownPaths := AbsPathMap.insert (!knownPaths, ap, i);
89 :     (ap, i)
90 :     end
91 :    
92 :     val native = intern o AbsPath.native
93 :     fun standard m = intern o AbsPath.standard m
94 :    
95 :     val contextName = AbsPath.contextName
96 :     fun contextOf (ap, _) = AbsPath.contextOf ap
97 :     fun specOf (ap, _) = AbsPath.specOf ap
98 :     fun osstring (ap, _) = AbsPath.osstring ap
99 :     fun descr (ap, _) = AbsPath.descr ap
100 :     fun reAnchoredName ((ap, _), root) = AbsPath.reAnchoredName (ap, root)
101 :     fun tstamp (ap, _) = AbsPath.tstamp ap
102 :     fun sameDirContext (ap, _) = AbsPath.sameDirContext ap
103 :     val cwdContext = AbsPath.cwdContext
104 :    
105 :     fun pickle warn ((ap, _), (cap, _)) = AbsPath.pickle warn (ap, cap)
106 : blume 367 fun unpickle m (l, (cap, _)) = intern (AbsPath.unpickle m (l, cap))
107 : blume 354 end

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