author | wenzelm |
Wed, 16 Jun 2004 20:37:00 +0200 | |
changeset 14955 | 08ee855c1d94 |
parent 14927 | 66d797e1b950 |
child 14981 | e73f8140af78 |
permissions | -rw-r--r-- |
11523 | 1 |
(* Title: Pure/General/scan.ML |
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ID: $Id$ |
|
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Author: Markus Wenzel and Tobias Nipkow, TU Muenchen |
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License: GPL (GNU GENERAL PUBLIC LICENSE) |
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|
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Generic scanners (for potentially infinite input). |
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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 this: ''a list -> ''a list -> ''a list * ''a list |
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val this_string: string -> string list -> string * string list |
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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 |
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val trace: ('a list -> 'b * 'c list) -> 'a list -> ('b * 'a list) * 'c list |
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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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'b * ('b -> bool) -> ('d * 'b list -> 'e list * ('d * 'b list)) -> |
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('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) -> |
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('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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type lexicon |
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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 is_literal: lexicon -> string list -> bool |
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val literal: lexicon -> string list -> string list * string list |
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end; |
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|
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structure Scan: SCAN = |
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struct |
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|
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|
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(** scanners **) |
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exception MORE of string option; (*need more input (prompt)*) |
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exception FAIL of string option; (*try alternatives (reason of failure)*) |
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exception ABORT of string; (*dead end*) |
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|
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|
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(* scanner combinators *) |
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|
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(*dependent pairing*) |
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fun (sc1 :-- sc2) toks = |
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let |
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val (x, toks2) = sc1 toks |
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val (y, toks3) = sc2 x toks2 |
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104 |
in ((x, y), toks3) end; |
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(*sequential pairing*) |
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fun (sc1 -- sc2) toks = |
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let |
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val (x, toks2) = sc1 toks |
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val (y, toks3) = sc2 toks2 |
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111 |
in ((x, y), toks3) end; |
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(*application*) |
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fun (sc >> f) toks = |
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let val (x, toks2) = sc toks |
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116 |
in (f x, toks2) end; |
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(*forget snd*) |
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fun (sc1 --| sc2) toks = |
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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; |
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(*forget fst*) |
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fun (sc1 |-- sc2) toks = |
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127 |
let val (_, toks2) = sc1 toks |
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128 |
in sc2 toks2 end; |
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|
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(*concatenation*) |
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fun (sc1 ^^ sc2) toks = |
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132 |
let |
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133 |
val (x, toks2) = sc1 toks |
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134 |
val (y, toks3) = sc2 toks2 |
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135 |
in (x ^ y, toks3) end; |
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136 |
|
14677 | 137 |
(*alternative*) |
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138 |
fun (scan1 || scan2) xs = scan1 xs handle FAIL _ => scan2 xs; |
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|
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140 |
|
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141 |
(* generic scanners *) |
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 |
fun fail _ = raise FAIL None; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
144 |
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
|
145 |
fun succeed y xs = (y, xs); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
146 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
147 |
fun one _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
148 |
| one pred (x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
149 |
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
|
150 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
151 |
fun $$ _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
152 |
| $$ a (x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
153 |
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
|
154 |
|
14833 | 155 |
fun this ys xs = |
14726 | 156 |
let |
157 |
fun drop_prefix [] xs = xs |
|
158 |
| drop_prefix (_ :: _) [] = raise MORE None |
|
159 |
| drop_prefix (y :: ys) (x :: xs) = |
|
160 |
if y = x then drop_prefix ys xs else raise FAIL None; |
|
161 |
in (ys, drop_prefix ys xs) end; |
|
162 |
||
14955 | 163 |
fun this_string s = this (explode s) >> K s; (*primitive string -- no symbols yet!*) |
14907 | 164 |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
165 |
fun any _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
166 |
| any pred (lst as x :: xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
167 |
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
|
168 |
else ([], lst); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
169 |
|
14078 | 170 |
fun any1 p toks = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
171 |
let |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
172 |
val (x, toks2) = one p toks |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
173 |
val (xs,toks3) = any p toks2 |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
174 |
in (x :: xs, toks3) end; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
175 |
|
14078 | 176 |
fun optional scan def = scan || succeed def |
177 |
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
|
178 |
|
13795 | 179 |
fun repeat scan = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
180 |
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
|
181 |
None => (rev ys, xs) | Some (y, xs') => rep (y :: ys) xs') |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
182 |
in rep [] end; |
13795 | 183 |
|
14078 | 184 |
fun repeat1 scan toks = |
14108
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
185 |
let |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
186 |
val (x, toks2) = scan toks |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
187 |
val (xs, toks3) = repeat scan toks2 |
eaf3c75f2c8e
Restored old (tail recursive!) version of repeat.
berghofe
parents:
14078
diff
changeset
|
188 |
in (x :: xs, toks3) end; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
189 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
190 |
fun max leq scan1 scan2 xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
191 |
(case (option scan1 xs, option scan2 xs) of |
11523 | 192 |
((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
|
193 |
| ((Some tok1, xs'), (None, _)) => (tok1, xs') |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
194 |
| ((None, _), (Some tok2, xs')) => (tok2, xs') |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
195 |
| ((Some tok1, xs1'), (Some tok2, xs2')) => |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
196 |
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
|
197 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
198 |
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
|
199 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
200 |
fun unless test scan = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
201 |
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
|
202 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
203 |
fun first [] = fail |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
204 |
| first (scan :: scans) = scan || first scans; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
205 |
|
14927 | 206 |
fun trace scan toks = |
207 |
let val (x, toks') = scan toks |
|
208 |
in ((x, take (length toks - length toks', toks)), toks') end; |
|
209 |
||
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
210 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
211 |
(* state based scanners *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
212 |
|
9122 | 213 |
fun state (st, xs) = (st, (st, xs)); |
214 |
||
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
215 |
fun depend scan (st, xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
216 |
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
|
217 |
in (y, (st', xs')) end; |
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 lift scan (st, xs) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
220 |
let val (y, xs') = scan xs |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
221 |
in (y, (st, xs')) end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
222 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
223 |
fun pass st scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
224 |
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
|
225 |
in (y, xs') end; |
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 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
228 |
(* exception handling *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
229 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
230 |
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
|
231 |
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
|
232 |
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
|
233 |
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
|
234 |
fun catch scan xs = scan xs handle ABORT msg => raise FAIL (Some msg); |
14833 | 235 |
fun error scan xs = scan xs handle ABORT msg => Output.error msg; |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
236 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
237 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
238 |
(* finite scans *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
239 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
240 |
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
|
241 |
let |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
242 |
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
|
243 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
244 |
fun stop [] = lost () |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
245 |
| stop lst = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
246 |
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
|
247 |
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
|
248 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
249 |
if exists is_stopper input then |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
250 |
raise ABORT "Stopper may not occur in input of finite scan!" |
13795 | 251 |
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
|
252 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
253 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
254 |
fun finite stopper scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
255 |
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
|
256 |
in (y, xs') end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
257 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
258 |
fun read stopper scan xs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
259 |
(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
|
260 |
(y as Some _, []) => y |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
261 |
| _ => None); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
262 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
263 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
264 |
(* infinite scans -- draining state-based source *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
265 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
266 |
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
|
267 |
(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
|
268 |
(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
|
269 |
([], _) => (finite' stopper scan (state, xs), src) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
270 |
| (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
|
271 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
272 |
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
|
273 |
let |
10746 | 274 |
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
|
275 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
276 |
fun drain_loop recover inp = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
277 |
drain_with (catch scanner) inp handle FAIL msg => |
10746 | 278 |
(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
|
279 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
280 |
val ((ys, (state', xs')), src') = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
281 |
(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
|
282 |
(([], s), _) => (([], (state, [])), s) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
283 |
| ((xs, s), None) => drain_with (error scanner) ((state, xs), s) |
8653 | 284 |
| ((xs, s), Some r) => drain_loop (unless (lift (one (#2 stopper))) r) ((state, xs), s)); |
285 |
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
|
286 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
287 |
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
|
288 |
let val (ys, ((), src')) = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
289 |
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
|
290 |
in (ys, src') end; |
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 |
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
|
293 |
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
|
294 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
295 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
296 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
297 |
(** datatype lexicon **) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
298 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
299 |
datatype lexicon = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
300 |
Empty | |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
301 |
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
|
302 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
303 |
val no_literal = []; |
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 |
(* dest_lexicon *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
307 |
|
7025 | 308 |
fun dest_lex Empty = [] |
309 |
| dest_lex (Branch (_, [], lt, eq, gt)) = |
|
310 |
dest_lex lt @ dest_lex eq @ dest_lex gt |
|
311 |
| dest_lex (Branch (_, cs, lt, eq, gt)) = |
|
312 |
dest_lex lt @ [cs] @ dest_lex eq @ dest_lex gt; |
|
313 |
||
314 |
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
|
315 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
316 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
317 |
(* empty, extend, make, merge lexicons *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
318 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
319 |
val empty_lexicon = Empty; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
320 |
|
11523 | 321 |
fun extend_lexicon lexicon [] = lexicon |
322 |
| extend_lexicon lexicon chrss = |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
323 |
let |
11523 | 324 |
fun ext (lex, chrs) = |
325 |
let |
|
326 |
fun add (Branch (d, a, lt, eq, gt)) (chs as c :: cs) = |
|
14686 | 327 |
(case String.compare (c, d) of |
328 |
LESS => Branch (d, a, add lt chs, eq, gt) |
|
329 |
| EQUAL => Branch (d, if null cs then chrs else a, lt, add eq cs, gt) |
|
330 |
| GREATER => Branch (d, a, lt, eq, add gt chs)) |
|
11523 | 331 |
| add Empty [c] = |
332 |
Branch (c, chrs, Empty, Empty, Empty) |
|
333 |
| add Empty (c :: cs) = |
|
334 |
Branch (c, no_literal, Empty, add Empty cs, Empty) |
|
335 |
| add lex [] = lex; |
|
336 |
in add lex chrs end; |
|
337 |
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
|
338 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
339 |
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
|
340 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
341 |
fun merge_lexicons lex1 lex2 = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
342 |
let |
7025 | 343 |
val chss1 = dest_lex lex1; |
344 |
val chss2 = dest_lex lex2; |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
345 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
346 |
if chss2 subset chss1 then lex1 |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
347 |
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
|
348 |
else extend_lexicon lex1 chss2 |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
349 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
350 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
351 |
|
14686 | 352 |
(* is_literal *) |
353 |
||
354 |
fun is_literal Empty _ = false |
|
355 |
| is_literal _ [] = false |
|
356 |
| is_literal (Branch (d, a, lt, eq, gt)) (chs as c :: cs) = |
|
357 |
(case String.compare (c, d) of |
|
358 |
LESS => is_literal lt chs |
|
359 |
| EQUAL => a <> no_literal andalso null cs orelse is_literal eq cs |
|
360 |
| GREATER => is_literal gt chs); |
|
361 |
||
362 |
||
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
363 |
(* scan literal *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
364 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
365 |
fun literal lex chrs = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
366 |
let |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
367 |
fun lit Empty res _ = res |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
368 |
| lit (Branch _) _ [] = raise MORE None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
369 |
| lit (Branch (d, a, lt, eq, gt)) res (chs as c :: cs) = |
14686 | 370 |
(case String.compare (c, d) of |
371 |
LESS => lit lt res chs |
|
372 |
| EQUAL => lit eq (if a = no_literal then res else Some (a, cs)) cs |
|
373 |
| GREATER => lit gt res chs); |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
374 |
in |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
375 |
(case lit lex None chrs of |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
376 |
None => raise FAIL None |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
377 |
| Some res => res) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
378 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
379 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
380 |
end; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
381 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
382 |
structure BasicScan: BASIC_SCAN = Scan; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
383 |
open BasicScan; |