author | wenzelm |
Thu, 04 Sep 2008 16:43:51 +0200 | |
changeset 28129 | 8f647d24b49f |
parent 27732 | 8dbf5761a24a |
child 29606 | fedb8be05f24 |
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 |
|
8806 | 5 |
Coalgebraic data sources -- efficient purely functional input streams. |
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6 |
*) |
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7 |
|
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8 |
signature SOURCE = |
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9 |
sig |
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10 |
type ('a, 'b) source |
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val default_prompt: string |
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12 |
val set_prompt: string -> ('a, 'b) source -> ('a, 'b) source |
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13 |
val get: ('a, 'b) source -> 'a list * ('a, 'b) source |
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14 |
val unget: 'a list * ('a, 'b) source -> ('a, 'b) source |
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15 |
val get_single: ('a, 'b) source -> ('a * ('a, 'b) source) option |
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16 |
val exhaust: ('a, 'b) source -> 'a list |
19485 | 17 |
val map_filter: ('a -> 'b option) -> ('a, 'c) source -> ('b, ('a, 'c) source) source |
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18 |
val filter: ('a -> bool) -> ('a, 'b) source -> ('a, ('a, 'b) source) source |
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19 |
val of_list: 'a list -> ('a, 'a list) source |
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val of_list_limited: int -> 'a list -> ('a, 'a list) source |
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21 |
val of_string: string -> (string, string list) source |
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val exhausted: ('a, 'b) source -> ('a, 'a list) source |
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val tty: (string, unit) source |
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val source': 'a -> 'b Scan.stopper -> ('a * 'b list -> 'c list * ('a * 'b list)) -> |
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nested source: explicit interactive flag for recover avoids duplicate errors;
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25 |
(bool * (string -> 'a * 'b list -> 'c list * ('a * 'b list))) option -> |
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26 |
('b, 'e) source -> ('c, 'a * ('b, 'e) source) source |
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val source: 'a Scan.stopper -> ('a list -> 'b list * 'a list) -> |
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28 |
(bool * (string -> 'a list -> 'b list * '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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31 |
|
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32 |
structure Source: SOURCE = |
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33 |
struct |
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|
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|
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36 |
(** datatype source **) |
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37 |
|
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38 |
datatype ('a, 'b) source = |
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39 |
Source of |
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40 |
{buffer: 'a list, |
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info: 'b, |
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42 |
prompt: string, |
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43 |
drain: string -> 'b -> 'a list * 'b}; |
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44 |
|
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45 |
fun make_source buffer info prompt drain = |
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46 |
Source {buffer = buffer, info = info, prompt = prompt, drain = drain}; |
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47 |
|
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|
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49 |
(* prompt *) |
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50 |
|
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51 |
val default_prompt = "> "; |
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52 |
|
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53 |
fun set_prompt prompt (Source {buffer, info, prompt = _, drain}) = |
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54 |
make_source buffer info prompt drain; |
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55 |
|
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56 |
|
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57 |
(* get / unget *) |
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58 |
|
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59 |
fun get (Source {buffer = [], info, prompt, drain}) = |
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60 |
let val (xs, info') = drain prompt info |
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61 |
in (xs, make_source [] info' prompt drain) end |
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62 |
| get (Source {buffer, info, prompt, drain}) = |
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63 |
(buffer, make_source [] info prompt drain); |
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64 |
|
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65 |
fun unget (xs, Source {buffer, info, prompt, drain}) = |
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66 |
make_source (xs @ buffer) info prompt drain; |
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67 |
|
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68 |
|
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69 |
(* variations on get *) |
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70 |
|
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71 |
fun get_prompt prompt src = get (set_prompt prompt src); |
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72 |
|
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73 |
fun get_single src = |
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74 |
(case get src of |
15531 | 75 |
([], _) => NONE |
76 |
| (x :: xs, src') => SOME (x, unget (xs, src'))); |
|
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77 |
|
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78 |
fun exhaust src = |
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79 |
(case get src of |
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80 |
([], _) => [] |
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81 |
| (xs, src') => xs @ exhaust src'); |
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82 |
|
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83 |
|
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84 |
(* (map)filter *) |
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85 |
|
19485 | 86 |
fun drain_map_filter f prompt src = |
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87 |
let |
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88 |
val (xs, src') = get_prompt prompt src; |
19485 | 89 |
val xs' = map_filter f xs; |
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90 |
in |
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91 |
if null xs orelse not (null xs') then (xs', src') |
19485 | 92 |
else drain_map_filter f prompt src' |
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93 |
end; |
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94 |
|
19485 | 95 |
fun map_filter f src = make_source [] src default_prompt (drain_map_filter f); |
96 |
fun filter pred = map_filter (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 |
|
14727
ab06e87e5c83
Source.of_list: no buffer limitation (now pointless due to tail-recursive Scan.repeat);
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104 |
fun of_list xs = make_source [] xs default_prompt (fn _ => fn xs => (xs, [])); |
24064 | 105 |
fun of_list_limited n xs = make_source [] xs default_prompt (fn _ => chop n); |
6181 | 106 |
|
24064 | 107 |
val of_string = of_list o explode; |
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108 |
|
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added exhausted: ('a, 'b) source -> ('a, 'a list) source;
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109 |
fun exhausted src = of_list (exhaust src); |
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110 |
|
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111 |
|
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112 |
(* stream source *) |
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113 |
|
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stream source: non-critical, assuming exclusive ownership;
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|
114 |
fun slurp_input instream = |
20737 | 115 |
let |
116 |
fun slurp () = |
|
117 |
(case TextIO.canInput (instream, 1) handle IO.Io _ => NONE of |
|
118 |
NONE => [] |
|
119 |
| SOME 0 => [] |
|
120 |
| SOME _ => TextIO.input instream :: slurp ()); |
|
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121 |
in maps explode (slurp ()) end; |
20737 | 122 |
|
25846 | 123 |
val tty = make_source [] () default_prompt (fn prompt => fn () => |
124 |
let val input = slurp_input TextIO.stdIn in |
|
20737 | 125 |
if exists (fn c => c = "\n") input then (input, ()) |
126 |
else |
|
25846 | 127 |
(case (Output.prompt prompt; TextIO.inputLine TextIO.stdIn) of |
25575 | 128 |
SOME line => (input @ explode line, ()) |
129 |
| NONE => (input, ())) |
|
25846 | 130 |
end); |
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131 |
|
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132 |
|
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133 |
|
23700
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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|
134 |
(** cascade sources **) |
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135 |
|
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136 |
(* state-based *) |
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137 |
|
23700
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
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|
138 |
fun drain_source' stopper scan opt_recover prompt (state, src) = |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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|
139 |
let |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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|
140 |
val drain = Scan.drain prompt get_prompt stopper; |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
141 |
val (xs, s) = get_prompt prompt src; |
fb1102e98cd4
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changeset
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142 |
val inp = ((state, xs), s); |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
143 |
val ((ys, (state', xs')), src') = |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
144 |
if null xs then (([], (state, [])), s) |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
145 |
else |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
146 |
(case opt_recover of |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
147 |
NONE => drain (Scan.error scan) inp |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
148 |
| SOME (interactive, recover) => |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
149 |
(drain (Scan.catch scan) inp handle Fail msg => |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
150 |
(if interactive then Output.error_msg msg else (); |
27732 | 151 |
drain (Scan.unless (Scan.lift (Scan.one (Scan.is_stopper stopper))) (recover msg)) inp))); |
23700
fb1102e98cd4
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changeset
|
152 |
in (ys, (state', unget (xs', src'))) end; |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
153 |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
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diff
changeset
|
154 |
fun source' init_state stopper scan recover src = |
23700
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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changeset
|
155 |
make_source [] (init_state, src) default_prompt (drain_source' stopper scan recover); |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
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changeset
|
156 |
|
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;
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diff
changeset
|
158 |
(* non state-based *) |
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
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diff
changeset
|
159 |
|
23700
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
160 |
fun drain_source stopper scan opt_recover prompt = |
fb1102e98cd4
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diff
changeset
|
161 |
Scan.unlift (drain_source' stopper (Scan.lift scan) |
fb1102e98cd4
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changeset
|
162 |
(Option.map (fn (int, r) => (int, Scan.lift o r)) opt_recover) prompt); |
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
163 |
|
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
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diff
changeset
|
164 |
fun source stopper scan recover src = |
23700
fb1102e98cd4
moved source cascading from scan.ML to source.ML;
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diff
changeset
|
165 |
make_source [] src default_prompt (drain_source stopper scan recover); |
6116
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
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diff
changeset
|
166 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
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diff
changeset
|
167 |
|
8ba2f25610f7
files scan.ML, source.ML, symbol.ML, pretty.ML moved to Pure/General;
wenzelm
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diff
changeset
|
168 |
end; |