author | wenzelm |
Wed, 03 Feb 1999 16:31:07 +0100 | |
changeset 6181 | 128646d4a975 |
parent 6118 | caa439435666 |
child 6640 | d2e8342bf5c3 |
permissions | -rw-r--r-- |
6118 | 1 |
(* Title: Pure/General/source.ML |
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2 |
ID: $Id$ |
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3 |
Author: Markus Wenzel, TU Muenchen |
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4 |
|
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Co-algebraic data sources. |
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6 |
*) |
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|
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signature SOURCE = |
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sig |
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type ('a, 'b) source |
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val set_prompt: string -> ('a, 'b) source -> ('a, 'b) source |
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12 |
val get: ('a, 'b) source -> 'a list * ('a, 'b) source |
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val unget: 'a list * ('a, 'b) source -> ('a, 'b) source |
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val get_single: ('a, 'b) source -> ('a * ('a, 'b) source) option |
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val exhaust: ('a, 'b) source -> 'a list |
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val mapfilter: ('a -> 'b option) -> ('a, 'c) source -> ('b, ('a, 'c) source) source |
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val filter: ('a -> bool) -> ('a, 'b) source -> ('a, ('a, 'b) source) source |
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val of_list: 'a list -> ('a, 'a list) source |
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val of_string: string -> (string, string list) source |
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val of_file: Path.T -> (string, string list) source * Position.T |
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val decorate_prompt_fn: (string -> string) ref |
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val of_stream: TextIO.instream -> TextIO.outstream -> (string, unit) source |
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val tty: (string, unit) source |
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val source': 'a -> 'b * ('b -> bool) -> ('a * 'b list -> 'c list * ('a * 'b list)) -> |
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('a * 'b list -> 'd * ('a * 'b list)) option -> |
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('b, 'e) source -> ('c, 'a * ('b, 'e) source) source |
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val source: 'a * ('a -> bool) -> ('a list -> 'b list * 'a list) -> |
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('a list -> 'c * 'a list) option -> |
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('a, 'd) source -> ('b, ('a, 'd) source) source |
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30 |
end; |
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|
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structure Source: SOURCE = |
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struct |
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|
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|
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36 |
(** datatype source **) |
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|
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datatype ('a, 'b) source = |
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Source of |
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{buffer: 'a list, |
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info: 'b, |
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prompt: string, |
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drain: string -> 'b -> 'a list * 'b}; |
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|
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fun make_source buffer info prompt drain = |
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Source {buffer = buffer, info = info, prompt = prompt, drain = drain}; |
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|
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|
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(* prompt *) |
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|
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val default_prompt = "> "; |
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|
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fun set_prompt prompt (Source {buffer, info, prompt = _, drain}) = |
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make_source buffer info prompt drain; |
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|
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|
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(* get / unget *) |
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|
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fun get (Source {buffer = [], info, prompt, drain}) = |
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let val (xs, info') = drain prompt info |
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in (xs, make_source [] info' prompt drain) end |
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| get (Source {buffer, info, prompt, drain}) = |
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(buffer, make_source [] info prompt drain); |
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|
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fun unget (xs, Source {buffer, info, prompt, drain}) = |
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make_source (xs @ buffer) info prompt drain; |
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|
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(* variations on get *) |
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|
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fun get_prompt prompt src = get (set_prompt prompt src); |
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|
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fun get_single src = |
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(case get src of |
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([], _) => None |
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| (x :: xs, src') => Some (x, unget (xs, src'))); |
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|
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fun exhaust src = |
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(case get src of |
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([], _) => [] |
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| (xs, src') => xs @ exhaust src'); |
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|
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84 |
(* (map)filter *) |
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|
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86 |
fun drain_mapfilter f prompt src = |
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87 |
let |
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val (xs, src') = get_prompt prompt src; |
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val xs' = Library.mapfilter f xs; |
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90 |
in |
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91 |
if null xs orelse not (null xs') then (xs', src') |
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92 |
else drain_mapfilter f prompt src' |
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93 |
end; |
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|
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95 |
fun mapfilter f src = make_source [] src default_prompt (drain_mapfilter f); |
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96 |
fun filter pred = mapfilter (fn x => if pred x then Some x else None); |
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97 |
|
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98 |
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99 |
|
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100 |
(** build sources **) |
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101 |
|
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102 |
(* list source *) |
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103 |
|
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104 |
(*limiting the input buffer considerably improves performance*) |
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105 |
val limit = 4000; |
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106 |
|
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107 |
fun drain_list _ xs = (take (limit, xs), drop (limit, xs)); |
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108 |
|
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109 |
fun of_list xs = make_source [] xs default_prompt drain_list; |
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110 |
val of_string = of_list o explode; |
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|
112 |
fun of_file raw_path = |
|
113 |
let val path = Path.expand raw_path |
|
114 |
in (of_string (File.read path), Position.line_name 1 (quote (Path.pack path))) end; |
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117 |
(* stream source *) |
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118 |
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119 |
val decorate_prompt_fn = ref (fn s:string => s); |
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120 |
|
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121 |
fun drain_stream instream outstream prompt () = |
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122 |
(TextIO.output (outstream, ! decorate_prompt_fn prompt); |
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changeset
|
123 |
TextIO.flushOut outstream; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
124 |
(explode (TextIO.inputLine instream), ())); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
125 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
126 |
fun of_stream instream outstream = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
127 |
make_source [] () default_prompt (drain_stream instream outstream); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
128 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
129 |
val tty = of_stream TextIO.stdIn TextIO.stdOut; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
130 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
131 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
132 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
133 |
(** compose sources **) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
134 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
135 |
fun drain_source source stopper scan recover prompt src = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
136 |
source prompt get_prompt unget stopper scan recover src; |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
137 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
138 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
139 |
(* state-based *) |
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 source' init_state stopper scan recover src = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
142 |
make_source [] (init_state, src) default_prompt |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
143 |
(drain_source Scan.source' stopper scan recover); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
144 |
|
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 |
(* non state-based *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
147 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
148 |
fun source stopper scan recover src = |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
149 |
make_source [] src default_prompt |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
150 |
(drain_source Scan.source stopper scan recover); |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
151 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
152 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
parents:
diff
changeset
|
153 |
end; |