author | berghofe |
Fri, 11 Jul 2003 15:00:54 +0200 | |
changeset 14108 | eaf3c75f2c8e |
parent 14078 | cddad2aa025b |
child 14677 | 33a37f091dc5 |
permissions | -rw-r--r-- |
11523 | 1 |
(* Title: Pure/General/scan.ML |
2 |
ID: $Id$ |
|
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Author: Markus Wenzel and Tobias Nipkow, TU Muenchen |
|
8806 | 4 |
License: GPL (GNU GENERAL PUBLIC LICENSE) |
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|
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Generic scanners (for potentially infinite input). |
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7 |
*) |
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|
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infix 5 -- :-- |-- --| ^^; |
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infix 3 >>; |
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infix 0 ||; |
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|
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signature BASIC_SCAN = |
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sig |
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(* error msg handler *) |
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val !! : ('a * string option -> string) -> ('a -> 'b) -> 'a -> 'b |
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(* apply function *) |
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val >> : ('a -> 'b * 'c) * ('b -> 'd) -> 'a -> 'd * 'c |
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(* alternative *) |
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val || : ('a -> 'b) * ('a -> 'b) -> 'a -> 'b |
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(* sequential pairing *) |
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val -- : ('a -> 'b * 'c) * ('c -> 'd * 'e) -> 'a -> ('b * 'd) * 'e |
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(* dependent pairing *) |
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val :-- : ('a -> 'b * 'c) * ('b -> 'c -> 'd * 'e) -> 'a -> ('b * 'd) * 'e |
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(* forget fst *) |
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val |-- : ('a -> 'b * 'c) * ('c -> 'd * 'e) -> 'a -> 'd * 'e |
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(* forget snd *) |
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val --| : ('a -> 'b * 'c) * ('c -> 'd * 'e) -> 'a -> 'b * 'e |
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(* concatenation *) |
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val ^^ : ('a -> string * 'b) * ('b -> string * 'c) -> 'a -> string * 'c |
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(* one element literal *) |
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val $$ : ''a -> ''a list -> ''a * ''a list |
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end; |
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|
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signature SCAN = |
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sig |
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include BASIC_SCAN |
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val fail: 'a -> 'b |
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val fail_with: ('a -> string) -> 'a -> 'b |
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val succeed: 'a -> 'b -> 'a * 'b |
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val one: ('a -> bool) -> 'a list -> 'a * 'a list |
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val any: ('a -> bool) -> 'a list -> 'a list * 'a list |
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val any1: ('a -> bool) -> 'a list -> 'a list * 'a list |
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val optional: ('a -> 'b * 'a) -> 'b -> 'a -> 'b * 'a |
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val option: ('a -> 'b * 'a) -> 'a -> 'b option * 'a |
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val repeat: ('a -> 'b * 'a) -> 'a -> 'b list * 'a |
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val repeat1: ('a -> 'b * 'a) -> 'a -> 'b list * 'a |
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val max: ('a * 'a -> bool) -> ('b -> 'a * 'b) -> ('b -> 'a * 'b) -> 'b -> 'a * 'b |
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val ahead: ('a -> 'b * 'c) -> 'a -> 'b * 'a |
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val unless: ('a -> 'b * 'a) -> ('a -> 'c * 'd) -> 'a -> 'c * 'd |
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val first: ('a -> 'b) list -> 'a -> 'b |
9122 | 52 |
val state: 'a * 'b -> 'a * ('a * 'b) |
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val depend: ('a -> 'b -> ('c * 'd) * 'e) -> 'a * 'b -> 'd * ('c * 'e) |
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val lift: ('a -> 'b * 'c) -> 'd * 'a -> 'b * ('d * 'c) |
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val pass: 'a -> ('a * 'b -> 'c * ('d * 'e)) -> 'b -> 'c * 'e |
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val try: ('a -> 'b) -> 'a -> 'b |
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val force: ('a -> 'b) -> 'a -> 'b |
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val prompt: string -> ('a -> 'b) -> 'a -> 'b |
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val finite': 'a * ('a -> bool) -> ('b * 'a list -> 'c * ('d * 'a list)) |
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-> 'b * 'a list -> 'c * ('d * 'a list) |
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val finite: 'a * ('a -> bool) -> ('a list -> 'b * 'a list) -> 'a list -> 'b * 'a list |
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val read: 'a * ('a -> bool) -> ('a list -> 'b * 'a list) -> 'a list -> 'b option |
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val catch: ('a -> 'b) -> 'a -> 'b |
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val error: ('a -> 'b) -> 'a -> 'b |
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val source': string -> (string -> 'a -> 'b list * 'a) -> ('b list * 'a -> 'c) -> |
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66 |
'b * ('b -> bool) -> ('d * 'b list -> 'e list * ('d * 'b list)) -> |
10746 | 67 |
('d * 'b list -> 'e list * ('d * 'b list)) option -> 'd * 'a -> 'e list * ('d * 'c) |
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val source: string -> (string -> 'a -> 'b list * 'a) -> ('b list * 'a -> 'c) -> |
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'b * ('b -> bool) -> ('b list -> 'd list * 'b list) -> |
10746 | 70 |
('b list -> 'd list * 'b list) option -> 'a -> 'd list * 'c |
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val single: ('a -> 'b * 'a) -> 'a -> 'b list * 'a |
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val bulk: ('a -> 'b * 'a) -> 'a -> 'b list * 'a |
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73 |
type lexicon |
7025 | 74 |
val dest_lexicon: lexicon -> string list |
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val make_lexicon: string list list -> lexicon |
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val empty_lexicon: lexicon |
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val extend_lexicon: lexicon -> string list list -> lexicon |
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val merge_lexicons: lexicon -> lexicon -> lexicon |
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val literal: lexicon -> string list -> string list * string list |
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end; |
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81 |
|
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structure Scan: SCAN = |
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struct |
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|
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|
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86 |
(** scanners **) |
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87 |
|
11523 | 88 |
exception MORE of string option; (*need more input (prompt)*) |
89 |
exception FAIL of string option; (*try alternatives (reason of failure)*) |
|
90 |
exception ABORT of string; (*dead end*) |
|
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|
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|
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(* scanner combinators *) |
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94 |
|
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(* dependent pairing *) |
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fun (sc1 :-- sc2) toks = |
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98 |
let |
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99 |
val (x, toks2) = sc1 toks |
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100 |
val (y, toks3) = sc2 x toks2 |
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101 |
in ((x, y), toks3) end; |
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|
103 |
(* sequential pairing *) |
|
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104 |
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fun (sc1 -- sc2) toks = |
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106 |
let |
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val (x, toks2) = sc1 toks |
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108 |
val (y, toks3) = sc2 toks2 |
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109 |
in ((x, y), toks3) end; |
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|
111 |
(* application *) |
|
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112 |
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fun (sc >> f) toks = |
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let val (x, toks2) = sc toks |
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115 |
in (f x, toks2) end; |
14078 | 116 |
|
117 |
(* forget snd *) |
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118 |
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fun (sc1 --| sc2) toks = |
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120 |
let |
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val (x, toks2) = sc1 toks |
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122 |
val (_, toks3) = sc2 toks2 |
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123 |
in (x, toks3) end; |
14078 | 124 |
|
125 |
(* forget fst *) |
|
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126 |
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fun (sc1 |-- sc2) toks = |
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128 |
let val (_, toks2) = sc1 toks |
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129 |
in sc2 toks2 end; |
14078 | 130 |
|
131 |
(* concatenation *) |
|
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132 |
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fun (sc1 ^^ sc2) toks = |
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134 |
let |
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135 |
val (x, toks2) = sc1 toks |
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136 |
val (y, toks3) = sc2 toks2 |
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137 |
in (x ^ y, toks3) end; |
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138 |
|
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139 |
(* alternative *) |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
140 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
141 |
fun (scan1 || scan2) xs = scan1 xs handle FAIL _ => scan2 xs; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
142 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
143 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
144 |
(* generic scanners *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
145 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
146 |
fun fail _ = raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
147 |
fun fail_with msg_of xs = raise FAIL (Some (msg_of xs)); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
148 |
fun succeed y xs = (y, xs); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
149 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
150 |
fun one _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
151 |
| one pred (x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
152 |
if pred x then (x, xs) else raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
153 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
154 |
fun $$ _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
155 |
| $$ a (x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
156 |
if a = x then (x, xs) else raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
157 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
158 |
fun any _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
159 |
| any pred (lst as x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
160 |
if pred x then apfst (cons x) (any pred xs) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
161 |
else ([], lst); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
162 |
|
14078 | 163 |
fun any1 p toks = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
164 |
let |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
165 |
val (x, toks2) = one p toks |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
166 |
val (xs,toks3) = any p toks2 |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
167 |
in (x :: xs, toks3) end; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
168 |
|
14078 | 169 |
fun optional scan def = scan || succeed def |
170 |
fun option scan = (scan >> Some) || succeed None |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
171 |
|
13795 | 172 |
fun repeat scan = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
173 |
let fun rep ys xs = (case (Some (scan xs) handle FAIL _ => None) of |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
174 |
None => (rev ys, xs) | Some (y, xs') => rep (y :: ys) xs') |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
175 |
in rep [] end; |
13795 | 176 |
|
14078 | 177 |
fun repeat1 scan toks = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
178 |
let |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
179 |
val (x, toks2) = scan toks |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
180 |
val (xs, toks3) = repeat scan toks2 |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
181 |
in (x :: xs, toks3) end; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
182 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
183 |
fun max leq scan1 scan2 xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
184 |
(case (option scan1 xs, option scan2 xs) of |
11523 | 185 |
((None, _), (None, _)) => raise FAIL None (*looses FAIL msg!*) |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
186 |
| ((Some tok1, xs'), (None, _)) => (tok1, xs') |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
187 |
| ((None, _), (Some tok2, xs')) => (tok2, xs') |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
188 |
| ((Some tok1, xs1'), (Some tok2, xs2')) => |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
189 |
if leq (tok2, tok1) then (tok1, xs1') else (tok2, xs2')); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
190 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
191 |
fun ahead scan xs = (fst (scan xs), xs); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
192 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
193 |
fun unless test scan = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
194 |
ahead (option test) :-- (fn None => scan | _ => fail) >> #2; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
195 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
196 |
fun first [] = fail |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
197 |
| first (scan :: scans) = scan || first scans; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
198 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
199 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
200 |
(* state based scanners *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
201 |
|
9122 | 202 |
fun state (st, xs) = (st, (st, xs)); |
203 |
||
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
204 |
fun depend scan (st, xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
205 |
let val ((st', y), xs') = scan st xs |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
206 |
in (y, (st', xs')) end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
207 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
208 |
fun lift scan (st, xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
209 |
let val (y, xs') = scan xs |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
210 |
in (y, (st, xs')) end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
211 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
212 |
fun pass st scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
213 |
let val (y, (_, xs')) = scan (st, xs) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
214 |
in (y, xs') end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
215 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
216 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
217 |
(* exception handling *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
218 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
219 |
fun !! err scan xs = scan xs handle FAIL msg => raise ABORT (err (xs, msg)); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
220 |
fun try scan xs = scan xs handle MORE _ => raise FAIL None | ABORT _ => raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
221 |
fun force scan xs = scan xs handle MORE _ => raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
222 |
fun prompt str scan xs = scan xs handle MORE None => raise MORE (Some str); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
223 |
fun catch scan xs = scan xs handle ABORT msg => raise FAIL (Some msg); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
224 |
fun error scan xs = scan xs handle ABORT msg => Library.error msg; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
225 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
226 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
227 |
(* finite scans *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
228 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
229 |
fun finite' (stopper, is_stopper) scan (state, input) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
230 |
let |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
231 |
fun lost () = raise ABORT "Scanner bug: lost stopper of finite scan!"; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
232 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
233 |
fun stop [] = lost () |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
234 |
| stop lst = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
235 |
let val (xs, x) = split_last lst |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
236 |
in if is_stopper x then ((), xs) else lost () end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
237 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
238 |
if exists is_stopper input then |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
239 |
raise ABORT "Stopper may not occur in input of finite scan!" |
13795 | 240 |
else (force scan --| lift stop) (state, rev_append (rev input) [stopper]) |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
241 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
242 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
243 |
fun finite stopper scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
244 |
let val (y, ((), xs')) = finite' stopper (lift scan) ((), xs) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
245 |
in (y, xs') end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
246 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
247 |
fun read stopper scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
248 |
(case error (finite stopper (option scan)) xs of |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
249 |
(y as Some _, []) => y |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
250 |
| _ => None); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
251 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
252 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
253 |
(* infinite scans -- draining state-based source *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
254 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
255 |
fun drain def_prmpt get stopper scan ((state, xs), src) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
256 |
(scan (state, xs), src) handle MORE prmpt => |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
257 |
(case get (if_none prmpt def_prmpt) src of |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
258 |
([], _) => (finite' stopper scan (state, xs), src) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
259 |
| (xs', src') => drain def_prmpt get stopper scan ((state, xs @ xs'), src')); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
260 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
261 |
fun source' def_prmpt get unget stopper scanner opt_recover (state, src) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
262 |
let |
10746 | 263 |
val drain_with = drain def_prmpt get stopper; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
264 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
265 |
fun drain_loop recover inp = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
266 |
drain_with (catch scanner) inp handle FAIL msg => |
10746 | 267 |
(error_msg (if_none msg "Syntax error."); drain_with recover inp); |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
268 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
269 |
val ((ys, (state', xs')), src') = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
270 |
(case (get def_prmpt src, opt_recover) of |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
271 |
(([], s), _) => (([], (state, [])), s) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
272 |
| ((xs, s), None) => drain_with (error scanner) ((state, xs), s) |
8653 | 273 |
| ((xs, s), Some r) => drain_loop (unless (lift (one (#2 stopper))) r) ((state, xs), s)); |
274 |
in (ys, (state', unget (xs', src'))) end; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
275 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
276 |
fun source def_prmpt get unget stopper scan opt_recover src = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
277 |
let val (ys, ((), src')) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
278 |
source' def_prmpt get unget stopper (lift scan) (apsome lift opt_recover) ((), src) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
279 |
in (ys, src') end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
280 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
281 |
fun single scan = scan >> (fn x => [x]); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
282 |
fun bulk scan = scan -- repeat (try scan) >> (op ::); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
283 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
284 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
285 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
286 |
(** datatype lexicon **) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
287 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
288 |
datatype lexicon = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
289 |
Empty | |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
290 |
Branch of string * string list * lexicon * lexicon * lexicon; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
291 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
292 |
val no_literal = []; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
293 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
294 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
295 |
(* dest_lexicon *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
296 |
|
7025 | 297 |
fun dest_lex Empty = [] |
298 |
| dest_lex (Branch (_, [], lt, eq, gt)) = |
|
299 |
dest_lex lt @ dest_lex eq @ dest_lex gt |
|
300 |
| dest_lex (Branch (_, cs, lt, eq, gt)) = |
|
301 |
dest_lex lt @ [cs] @ dest_lex eq @ dest_lex gt; |
|
302 |
||
303 |
val dest_lexicon = map implode o dest_lex; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
304 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
305 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
306 |
(* empty, extend, make, merge lexicons *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
307 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
308 |
val empty_lexicon = Empty; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
309 |
|
11523 | 310 |
fun extend_lexicon lexicon [] = lexicon |
311 |
| extend_lexicon lexicon chrss = |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
312 |
let |
11523 | 313 |
fun ext (lex, chrs) = |
314 |
let |
|
315 |
fun add (Branch (d, a, lt, eq, gt)) (chs as c :: cs) = |
|
316 |
if c < d then Branch (d, a, add lt chs, eq, gt) |
|
317 |
else if c > d then Branch (d, a, lt, eq, add gt chs) |
|
318 |
else Branch (d, if null cs then chrs else a, lt, add eq cs, gt) |
|
319 |
| add Empty [c] = |
|
320 |
Branch (c, chrs, Empty, Empty, Empty) |
|
321 |
| add Empty (c :: cs) = |
|
322 |
Branch (c, no_literal, Empty, add Empty cs, Empty) |
|
323 |
| add lex [] = lex; |
|
324 |
in add lex chrs end; |
|
325 |
in foldl ext (lexicon, chrss \\ dest_lex lexicon) end; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
326 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
327 |
val make_lexicon = extend_lexicon empty_lexicon; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
328 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
329 |
fun merge_lexicons lex1 lex2 = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
330 |
let |
7025 | 331 |
val chss1 = dest_lex lex1; |
332 |
val chss2 = dest_lex lex2; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
333 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
334 |
if chss2 subset chss1 then lex1 |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
335 |
else if chss1 subset chss2 then lex2 |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
336 |
else extend_lexicon lex1 chss2 |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
337 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
338 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
339 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
340 |
(* scan literal *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
341 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
342 |
fun literal lex chrs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
343 |
let |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
344 |
fun lit Empty res _ = res |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
345 |
| lit (Branch _) _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
346 |
| lit (Branch (d, a, lt, eq, gt)) res (chs as c :: cs) = |
11523 | 347 |
if c < d then lit lt res chs |
348 |
else if c > d then lit gt res chs |
|
349 |
else lit eq (if a = no_literal then res else Some (a, cs)) cs; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
350 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
351 |
(case lit lex None chrs of |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
352 |
None => raise FAIL None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
353 |
| Some res => res) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
354 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
355 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
356 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
357 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
358 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
359 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
360 |
structure BasicScan: BASIC_SCAN = Scan; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
361 |
open BasicScan; |