aboutsummaryrefslogtreecommitdiff
path: root/src/stklos/eval.stk
blob: 3acace9246f0dbc405abc0fe524312bf8c9bbfc7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
;;;;
;;;; eval.stk		-- Skribe Evaluator
;;;; 
;;;; Copyright � 2003-2004 Erick Gallesio - I3S-CNRS/ESSI <eg@essi.fr>
;;;; 
;;;; 
;;;; This program is free software; you can redistribute it and/or modify
;;;; it under the terms of the GNU General Public License as published by
;;;; the Free Software Foundation; either version 2 of the License, or
;;;; (at your option) any later version.
;;;; 
;;;; This program is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;;; GNU General Public License for more details.
;;;; 
;;;; You should have received a copy of the GNU General Public License
;;;; along with this program; if not, write to the Free Software
;;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
;;;; USA.
;;;; 
;;;;           Author: Erick Gallesio [eg@essi.fr]
;;;;    Creation date: 27-Jul-2003 09:15 (eg)
;;;; Last file update: 28-Oct-2004 15:05 (eg)
;;;;


;; FIXME; On peut impl�menter maintenant skribe-warning/node


(define-module SKRIBE-EVAL-MODULE
  (import SKRIBE-DEBUG-MODULE SKRIBE-ENGINE-MODULE SKRIBE-VERIFY-MODULE
	  SKRIBE-RESOLVE-MODULE SKRIBE-OUTPUT-MODULE)
  (export skribe-eval skribe-eval-port skribe-load skribe-load-options
	  skribe-include)


(define *skribe-loaded* '())  		;; List of already loaded files
(define *skribe-load-options* '())

(define (%evaluate expr)
  (with-handler
      (lambda (c)
	(flush-output-port (current-error-port))
	(raise c))
      (eval expr (find-module 'STklos))))

;;;
;;; SKRIBE-EVAL
;;;
(define (skribe-eval a e :key (env '()))
  (with-debug 2 'skribe-eval
     (debug-item "a=" a " e=" (engine-ident e))
     (let ((a2 (resolve! a e env)))
       (debug-item "resolved a=" a)
       (let ((a3 (verify a2 e)))
	 (debug-item "verified a=" a3)
	 (output a3 e)))))

;;;
;;; SKRIBE-EVAL-PORT
;;;
(define (skribe-eval-port port engine :key (env '()))
  (with-debug 2 'skribe-eval-port
     (debug-item "engine=" engine)
     (let ((e (if (symbol? engine) (find-engine engine) engine)))
       (debug-item "e=" e)
       (if (not (is-a? e <engine>))
	   (skribe-error 'skribe-eval-port "Cannot find engine" engine)
	   (let loop ((exp (read port)))
	     (with-debug 10 'skribe-eval-port
		(debug-item "exp=" exp))
	     (unless (eof-object? exp)
	       (skribe-eval (%evaluate exp) e :env env)
	       (loop (read port))))))))

;;;
;;; SKRIBE-LOAD
;;;
(define *skribe-load-options* '())

(define (skribe-load-options)
  *skribe-load-options*)

(define (skribe-load file :rest opt :key engine path)
  (with-debug 4 'skribe-load
     (debug-item "  engine=" engine)
     (debug-item "  path=" path)
     (debug-item "  opt" opt)

     (let* ((ei  (cond
		  ((not engine) *skribe-engine*)
		  ((engine? engine) engine)
		  ((not (symbol? engine)) (skribe-error 'skribe-load
							"Illegal engine" engine))
		  (else engine)))
	    (path (cond
		    ((not path) (skribe-path))
		    ((string? path) (list path))
		    ((not (and (list? path) (every? string? path)))
		        (skribe-error 'skribe-load "Illegal path" path))
		    (else path)))
	     (filep (find-path file path)))

       (set! *skribe-load-options* opt)

       (unless (and (string? filep) (file-exists? filep))
	 (skribe-error 'skribe-load
		       (format "Cannot find ~S in path" file)
		       *skribe-path*))
       
       ;; Load this file if not already done
       (unless (member filep *skribe-loaded*)
	 (cond
	   ((> *skribe-verbose* 1)
	    (format (current-error-port) "  [loading file: ~S ~S]\n" filep opt))
	   ((> *skribe-verbose* 0)
	    (format (current-error-port) "  [loading file: ~S]\n" filep)))
	 ;; Load it
	 (with-input-from-file filep
	   (lambda ()
	     (skribe-eval-port (current-input-port) ei)))
	 (set! *skribe-loaded* (cons filep *skribe-loaded*))))))

;;;
;;; SKRIBE-INCLUDE
;;;
(define (skribe-include file :optional (path (skribe-path)))
  (unless (every string? path)
    (skribe-error 'skribe-include "Illegal path" path))

  (let ((path (find-path file path)))
    (unless (and (string? path) (file-exists? path))
      (skribe-error 'skribe-load
		    (format "Cannot find ~S in path" file)
		    path))
    (when (> *skribe-verbose* 0)
      (format (current-error-port) "  [including file: ~S]\n" path))
    (with-input-from-file path
      (lambda ()
	(let Loop ((exp (read (current-input-port)))
		   (res '()))
	  (if (eof-object? exp)
	      (if (and (pair? res) (null? (cdr res)))
		  (car res)
		  (reverse! res))
	      (Loop (read (current-input-port))
		    (cons (%evaluate exp) res))))))))
)