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196 lines
6.8 KiB
Scheme
196 lines
6.8 KiB
Scheme
;;;; Copyright (C) 1996, 1998, 1999, 2001 Free Software Foundation, Inc.
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;;;;
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;;;; This program is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;;;; Boston, MA 02110-1301 USA
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;;;;
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;;;; As a special exception, the Free Software Foundation gives permission
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;;;; for additional uses of the text contained in its release of GUILE.
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;;;;
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;;;; The exception is that, if you link the GUILE library with other files
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;;;; to produce an executable, this does not by itself cause the
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;;;; resulting executable to be covered by the GNU General Public License.
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;;;; Your use of that executable is in no way restricted on account of
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;;;; linking the GUILE library code into it.
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;;;;
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;;;; This exception does not however invalidate any other reasons why
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;;;; the executable file might be covered by the GNU General Public License.
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;;;;
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;;;; This exception applies only to the code released by the
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;;;; Free Software Foundation under the name GUILE. If you copy
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;;;; code from other Free Software Foundation releases into a copy of
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;;;; GUILE, as the General Public License permits, the exception does
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;;;; not apply to the code that you add in this way. To avoid misleading
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;;;; anyone as to the status of such modified files, you must delete
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;;;; this exception notice from them.
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;;;;
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;;;; If you write modifications of your own for GUILE, it is your choice
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;;;; whether to permit this exception to apply to your modifications.
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;;;; If you do not wish that, delete this exception notice.
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;;;;
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;;; Commentary:
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;; This module is documented in the Guile Reference Manual.
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;; Briefly, these are exported:
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;; procedures: expect-select, expect-regexec
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;; variables: expect-port, expect-timeout, expect-timeout-proc,
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;; expect-eof-proc, expect-char-proc,
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;; expect-strings-compile-flags, expect-strings-exec-flags,
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;; macros: expect, expect-strings
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;;; Code:
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(define-module (ice-9 expect)
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:use-module (ice-9 regex)
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:export-syntax (expect expect-strings)
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:export (expect-port expect-timeout expect-timeout-proc
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expect-eof-proc expect-char-proc expect-strings-compile-flags
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expect-strings-exec-flags expect-select expect-regexec))
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;;; Expect: a macro for selecting actions based on what it reads from a port.
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;;; The idea is from Don Libes' expect based on Tcl.
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;;; This version by Gary Houston incorporating ideas from Aubrey Jaffer.
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(define expect-port #f)
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(define expect-timeout #f)
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(define expect-timeout-proc #f)
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(define expect-eof-proc #f)
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(define expect-char-proc #f)
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;;; expect: each test is a procedure which is applied to the accumulating
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;;; string.
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(defmacro expect clauses
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(let ((s (gensym))
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(c (gensym))
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(port (gensym))
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(timeout (gensym)))
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`(let ((,s "")
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(,port (or expect-port (current-input-port)))
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;; when timeout occurs, in floating point seconds.
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(,timeout (if expect-timeout
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(let* ((secs-usecs (gettimeofday)))
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(+ (car secs-usecs)
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expect-timeout
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(/ (cdr secs-usecs)
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1000000))) ; one million.
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#f)))
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(let next-char ()
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(if (and expect-timeout
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(not (expect-select ,port ,timeout)))
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(if expect-timeout-proc
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(expect-timeout-proc ,s)
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#f)
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(let ((,c (read-char ,port)))
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(if expect-char-proc
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(expect-char-proc ,c))
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(if (not (eof-object? ,c))
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(set! ,s (string-append ,s (string ,c))))
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(cond
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;; this expands to clauses where the car invokes the
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;; match proc and the cdr is the return value from expect
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;; if the proc matched.
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,@(let next-expr ((tests (map car clauses))
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(exprs (map cdr clauses))
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(body '()))
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(cond
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((null? tests)
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(reverse body))
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(else
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(next-expr
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(cdr tests)
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(cdr exprs)
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(cons
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`((,(car tests) ,s (eof-object? ,c))
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,@(cond ((null? (car exprs))
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'())
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((eq? (caar exprs) '=>)
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(if (not (= (length (car exprs))
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2))
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(scm-error 'misc-error
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"expect"
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"bad recipient: ~S"
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(list (car exprs))
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#f)
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`((apply ,(cadar exprs)
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(,(car tests) ,s ,port)))))
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(else
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(car exprs))))
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body)))))
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;; if none of the clauses matched the current string.
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(else (cond ((eof-object? ,c)
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(if expect-eof-proc
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(expect-eof-proc ,s)
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#f))
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(else
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(next-char)))))))))))
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(define expect-strings-compile-flags regexp/newline)
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(define expect-strings-exec-flags regexp/noteol)
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;;; the regexec front-end to expect:
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;;; each test must evaluate to a regular expression.
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(defmacro expect-strings clauses
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`(let ,@(let next-test ((tests (map car clauses))
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(exprs (map cdr clauses))
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(defs '())
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(body '()))
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(cond ((null? tests)
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(list (reverse defs) `(expect ,@(reverse body))))
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(else
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(let ((rxname (gensym)))
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(next-test (cdr tests)
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(cdr exprs)
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(cons `(,rxname (make-regexp
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,(car tests)
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expect-strings-compile-flags))
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defs)
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(cons `((lambda (s eof?)
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(expect-regexec ,rxname s eof?))
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,@(car exprs))
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body))))))))
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;;; simplified select: returns #t if input is waiting or #f if timed out or
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;;; select was interrupted by a signal.
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;;; timeout is an absolute time in floating point seconds.
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(define (expect-select port timeout)
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(let* ((secs-usecs (gettimeofday))
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(relative (- timeout
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(car secs-usecs)
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(/ (cdr secs-usecs)
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1000000)))) ; one million.
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(and (> relative 0)
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(pair? (car (select (list port) '() '()
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relative))))))
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;;; match a string against a regexp, returning a list of strings (required
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;;; by the => syntax) or #f. called once each time a character is added
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;;; to s (eof? will be #f), and once when eof is reached (with eof? #t).
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(define (expect-regexec rx s eof?)
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;; if expect-strings-exec-flags contains regexp/noteol,
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;; remove it for the eof test.
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(let* ((flags (if (and eof?
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(logand expect-strings-exec-flags regexp/noteol))
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(logxor expect-strings-exec-flags regexp/noteol)
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expect-strings-exec-flags))
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(match (regexp-exec rx s 0 flags)))
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(if match
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(do ((i (- (match:count match) 1) (- i 1))
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(result '() (cons (match:substring match i) result)))
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((< i 0) result))
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#f)))
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;;; expect.scm ends here
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