Commit | Line | Data |
---|---|---|
2645b7b8 | 1 | ;;;; Copyright (C) 1996, 1998, 1999 Free Software Foundation, Inc. |
d7189b49 GH |
2 | ;;;; |
3 | ;;;; This program is free software; you can redistribute it and/or modify | |
4 | ;;;; it under the terms of the GNU General Public License as published by | |
5 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
6 | ;;;; any later version. | |
7 | ;;;; | |
8 | ;;;; This program is distributed in the hope that it will be useful, | |
9 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | ;;;; GNU General Public License for more details. | |
12 | ;;;; | |
13 | ;;;; You should have received a copy of the GNU General Public License | |
14 | ;;;; along with this software; see the file COPYING. If not, write to | |
15328041 JB |
15 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, |
16 | ;;;; Boston, MA 02111-1307 USA | |
d7189b49 GH |
17 | ;;;; |
18 | \f | |
19 | ||
28d8ab3c | 20 | (define-module (ice-9 expect) :use-module (ice-9 regex)) |
ec8469e7 | 21 | |
d7189b49 GH |
22 | ;;; Expect: a macro for selecting actions based on what it reads from a port. |
23 | ;;; The idea is from Don Libes' expect based on Tcl. | |
24 | ;;; This version by Gary Houston incorporating ideas from Aubrey Jaffer. | |
25 | \f | |
26 | ||
ec8469e7 JB |
27 | (define-public expect-port #f) |
28 | (define-public expect-timeout #f) | |
29 | (define-public expect-timeout-proc #f) | |
30 | (define-public expect-eof-proc #f) | |
31 | (define-public expect-char-proc #f) | |
d7189b49 GH |
32 | |
33 | ;;; expect: each test is a procedure which is applied to the accumulating | |
34 | ;;; string. | |
ec8469e7 | 35 | (defmacro-public expect clauses |
d7189b49 GH |
36 | (let ((s (gentemp)) |
37 | (c (gentemp)) | |
38 | (port (gentemp)) | |
39 | (timeout (gentemp))) | |
40 | `(let ((,s "") | |
41 | (,port (or expect-port (current-input-port))) | |
cafa4c68 | 42 | ;; when timeout occurs, in floating point seconds. |
d7189b49 | 43 | (,timeout (if expect-timeout |
cafa4c68 GH |
44 | (let* ((secs-usecs (gettimeofday))) |
45 | (+ (car secs-usecs) | |
46 | expect-timeout | |
47 | (/ (cdr secs-usecs) | |
48 | 1000000))) ; one million. | |
d7189b49 GH |
49 | #f))) |
50 | (let next-char () | |
51 | (if (and expect-timeout | |
28d77376 | 52 | (not (expect-select ,port ,timeout))) |
d7189b49 GH |
53 | (if expect-timeout-proc |
54 | (expect-timeout-proc ,s) | |
55 | #f) | |
56 | (let ((,c (read-char ,port))) | |
57 | (if expect-char-proc | |
58 | (expect-char-proc ,c)) | |
8f59c14e JB |
59 | (if (not (eof-object? ,c)) |
60 | (set! ,s (string-append ,s (string ,c)))) | |
61 | (cond | |
28d77376 GH |
62 | ;; this expands to clauses where the car invokes the |
63 | ;; match proc and the cdr is the return value from expect | |
64 | ;; if the proc matched. | |
8f59c14e JB |
65 | ,@(let next-expr ((tests (map car clauses)) |
66 | (exprs (map cdr clauses)) | |
67 | (body '())) | |
68 | (cond | |
69 | ((null? tests) | |
70 | (reverse body)) | |
d7189b49 | 71 | (else |
8f59c14e JB |
72 | (next-expr |
73 | (cdr tests) | |
74 | (cdr exprs) | |
75 | (cons | |
76 | `((,(car tests) ,s (eof-object? ,c)) | |
77 | ,@(cond ((null? (car exprs)) | |
78 | '()) | |
79 | ((eq? (caar exprs) '=>) | |
80 | (if (not (= (length (car exprs)) | |
81 | 2)) | |
82 | (scm-error 'misc-error | |
83 | "expect" | |
8641dd9e | 84 | "bad recipient: ~S" |
8f59c14e JB |
85 | (list (car exprs)) |
86 | #f) | |
87 | `((apply ,(cadar exprs) | |
88 | (,(car tests) ,s ,port))))) | |
89 | (else | |
90 | (car exprs)))) | |
91 | body))))) | |
92 | ;; if none of the clauses matched the current string. | |
93 | (else (cond ((eof-object? ,c) | |
94 | (if expect-eof-proc | |
95 | (expect-eof-proc ,s) | |
96 | #f)) | |
d7189b49 | 97 | (else |
8f59c14e | 98 | (next-char))))))))))) |
d7189b49 | 99 | |
156ecad5 JB |
100 | |
101 | (define-public expect-strings-compile-flags regexp/newline) | |
2645b7b8 | 102 | (define-public expect-strings-exec-flags regexp/noteol) |
156ecad5 | 103 | |
d7189b49 GH |
104 | ;;; the regexec front-end to expect: |
105 | ;;; each test must evaluate to a regular expression. | |
ec8469e7 | 106 | (defmacro-public expect-strings clauses |
d7189b49 GH |
107 | `(let ,@(let next-test ((tests (map car clauses)) |
108 | (exprs (map cdr clauses)) | |
28d8ab3c GH |
109 | (defs '()) |
110 | (body '())) | |
d7189b49 GH |
111 | (cond ((null? tests) |
112 | (list (reverse defs) `(expect ,@(reverse body)))) | |
113 | (else | |
114 | (let ((rxname (gentemp))) | |
115 | (next-test (cdr tests) | |
116 | (cdr exprs) | |
156ecad5 JB |
117 | (cons `(,rxname (make-regexp |
118 | ,(car tests) | |
119 | expect-strings-compile-flags)) | |
d7189b49 | 120 | defs) |
8f59c14e JB |
121 | (cons `((lambda (s eof?) |
122 | (expect-regexec ,rxname s eof?)) | |
d7189b49 GH |
123 | ,@(car exprs)) |
124 | body)))))))) | |
125 | ||
28d77376 GH |
126 | ;;; simplified select: returns #t if input is waiting or #f if timed out or |
127 | ;;; select was interrupted by a signal. | |
cafa4c68 | 128 | ;;; timeout is an absolute time in floating point seconds. |
ec8469e7 | 129 | (define-public (expect-select port timeout) |
cafa4c68 GH |
130 | (let* ((secs-usecs (gettimeofday)) |
131 | (relative (- timeout | |
132 | (car secs-usecs) | |
133 | (/ (cdr secs-usecs) | |
134 | 1000000)))) ; one million. | |
d7189b49 | 135 | (and (> relative 0) |
28d8ab3c | 136 | (pair? (car (select (list port) '() '() |
cafa4c68 | 137 | relative)))))) |
28d8ab3c | 138 | |
8f59c14e JB |
139 | ;;; match a string against a regexp, returning a list of strings (required |
140 | ;;; by the => syntax) or #f. called once each time a character is added | |
141 | ;;; to s (eof? will be #f), and once when eof is reached (with eof? #t). | |
142 | (define-public (expect-regexec rx s eof?) | |
2645b7b8 | 143 | ;; if expect-strings-exec-flags contains regexp/noteol, |
8f59c14e JB |
144 | ;; remove it for the eof test. |
145 | (let* ((flags (if (and eof? | |
146 | (logand expect-strings-exec-flags regexp/noteol)) | |
2645b7b8 JB |
147 | (logxor expect-strings-exec-flags regexp/noteol) |
148 | expect-strings-exec-flags)) | |
156ecad5 | 149 | (match (regexp-exec rx s 0 flags))) |
28d8ab3c GH |
150 | (if match |
151 | (do ((i (- (match:count match) 1) (- i 1)) | |
152 | (result '() (cons (match:substring match i) result))) | |
153 | ((< i 0) result)) | |
154 | #f))) | |
2645b7b8 | 155 |