author | wenzelm |
Thu, 09 Jun 2011 17:51:49 +0200 | |
changeset 43326 | 47cf4bc789aa |
parent 43324 | 2b47822868e4 |
child 43329 | 84472e198515 |
permissions | -rw-r--r-- |
20089 | 1 |
(* Title: Pure/name.ML |
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Author: Makarius |
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Names of basic logical entities (variables etc.). |
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*) |
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signature NAME = |
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sig |
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val uu: string |
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val aT: string |
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val bound: int -> string |
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val is_bound: string -> bool |
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val internal: string -> string |
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val dest_internal: string -> string |
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val skolem: string -> string |
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val dest_skolem: string -> string |
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val clean_index: string * int -> string * int |
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val clean: string -> string |
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type context |
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val context: context |
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val make_context: string list -> context |
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val declare: string -> context -> context |
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val is_declared: context -> string -> bool |
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val invents: context -> string -> int -> string list |
20192
956cd30ef3be
renamed Name.give_names to Name.names and moved Name.alphanum to Symbol.alphanum
haftmann
parents:
20174
diff
changeset
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val names: context -> string -> 'a list -> (string * 'a) list |
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val invent_list: string list -> string -> int -> string list |
43326
47cf4bc789aa
simplified Name.variant -- discontinued builtin fold_map;
wenzelm
parents:
43324
diff
changeset
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val variant: string -> context -> string * context |
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val variant_list: string list -> string list -> string list |
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val desymbolize: bool -> string -> string |
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end; |
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structure Name: NAME = |
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struct |
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(** common defaults **) |
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val uu = "uu"; |
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val aT = "'a"; |
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(** special variable names **) |
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(* encoded bounds *) |
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(*names for numbered variables -- |
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preserves order wrt. int_ord vs. string_ord, avoids allocating new strings*) |
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val small_int = Vector.tabulate (1000, fn i => |
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let val leading = if i < 10 then "00" else if i < 100 then "0" else "" |
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in ":" ^ leading ^ string_of_int i end); |
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fun bound n = |
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if n < 1000 then Vector.sub (small_int, n) |
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else ":" ^ bound (n div 1000) ^ Vector.sub (small_int, n mod 1000); |
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val is_bound = String.isPrefix ":"; |
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(* internal names *) |
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val internal = suffix "_"; |
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val dest_internal = unsuffix "_"; |
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val skolem = suffix "__"; |
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val dest_skolem = unsuffix "__"; |
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fun clean_index (x, i) = |
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(case try dest_internal x of |
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NONE => (x, i) |
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| SOME x' => clean_index (x', i + 1)); |
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fun clean x = #1 (clean_index (x, 0)); |
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(** generating fresh names **) |
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(* context *) |
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datatype context = |
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Context of string option Symtab.table; (*declared names with latest renaming*) |
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fun declare x (Context tab) = |
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Context (Symtab.default (clean x, NONE) tab); |
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fun declare_renaming (x, x') (Context tab) = |
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Context (Symtab.update (clean x, SOME (clean x')) tab); |
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fun is_declared (Context tab) = Symtab.defined tab; |
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fun declared (Context tab) = Symtab.lookup tab; |
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val context = Context Symtab.empty |> fold declare ["", "'"]; |
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fun make_context used = fold declare used context; |
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(* invents *) |
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fun invents ctxt = |
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let |
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fun invs _ 0 = [] |
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| invs x n = |
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let val x' = Symbol.bump_string x in |
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if is_declared ctxt x then invs x' n |
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else x :: invs x' (n - 1) |
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end; |
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in invs o clean end; |
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fun names ctxt x xs = invents ctxt x (length xs) ~~ xs; |
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val invent_list = invents o make_context; |
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(* variants *) |
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(*makes a variant of a name distinct from already used names in a |
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context; preserves a suffix of underscores "_"*) |
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43326
47cf4bc789aa
simplified Name.variant -- discontinued builtin fold_map;
wenzelm
parents:
43324
diff
changeset
|
118 |
fun variant name ctxt = |
20089 | 119 |
let |
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fun vary x = |
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(case declared ctxt x of |
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NONE => x |
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| SOME x' => vary (Symbol.bump_string (the_default x x'))); |
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20121 | 125 |
val (x, n) = clean_index (name, 0); |
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val (x', ctxt') = |
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if not (is_declared ctxt x) then (x, declare x ctxt) |
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else |
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let |
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val x0 = Symbol.bump_init x; |
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val x' = vary x0; |
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val ctxt' = ctxt |
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|> x0 <> x' ? declare_renaming (x0, x') |
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|> declare x'; |
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in (x', ctxt') end; |
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43326
47cf4bc789aa
simplified Name.variant -- discontinued builtin fold_map;
wenzelm
parents:
43324
diff
changeset
|
136 |
in (x' ^ replicate_string n "_", ctxt') end; |
20089 | 137 |
|
43326
47cf4bc789aa
simplified Name.variant -- discontinued builtin fold_map;
wenzelm
parents:
43324
diff
changeset
|
138 |
fun variant_list used names = #1 (make_context used |> fold_map variant names); |
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31013 | 140 |
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31035 | 141 |
(* names conforming to typical requirements of identifiers in the world outside *) |
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fun desymbolize upper "" = if upper then "X" else "x" |
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| desymbolize upper s = |
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let |
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val xs as (x :: _) = Symbol.explode s; |
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val ys = |
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if Symbol.is_ascii_letter x orelse Symbol.is_symbolic x then xs |
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else "x" :: xs; |
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fun is_valid x = |
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34307 | 151 |
Symbol.is_ascii_letter x orelse Symbol.is_ascii_digit x; |
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fun sep [] = [] |
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| sep (xs as "_" :: _) = xs |
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| sep xs = "_" :: xs; |
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fun desep ("_" :: xs) = xs |
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| desep xs = xs; |
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fun desymb x xs = |
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if is_valid x then x :: xs |
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else |
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(case Symbol.decode x of |
40627
becf5d5187cc
renamed raw "explode" function to "raw_explode" to emphasize its meaning;
wenzelm
parents:
34307
diff
changeset
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Symbol.Sym name => "_" :: raw_explode name @ sep xs |
33547 | 162 |
| _ => sep xs); |
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fun upper_lower cs = |
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if upper then nth_map 0 Symbol.to_ascii_upper cs |
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else |
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(if forall Symbol.is_ascii_upper cs then map else nth_map 0) |
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Symbol.to_ascii_lower cs; |
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in fold_rev desymb ys [] |> desep |> upper_lower |> implode end; |
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end; |