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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
/*@z40.c:Filter Handler:FilterInit()@*****************************************/
/* */
/* THE LOUT DOCUMENT FORMATTING SYSTEM (VERSION 3.18) */
/* COPYRIGHT (C) 1991, 2000 Jeffrey H. Kingston */
/* */
/* Jeffrey H. Kingston (jeff@cs.usyd.edu.au) */
/* Basser Department of Computer Science */
/* The University of Sydney 2006 */
/* AUSTRALIA */
/* */
/* 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, 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 */
/* */
/* FILE: z40.c */
/* MODULE: Filter Handler */
/* EXTERNS: FilterInit(), FilterCreate(), FilterSetFileNames(), */
/* FilterExecute(), FilterWrite(), FilterScavenge() */
/* */
/*****************************************************************************/
#include "externs.h"
static int filter_count; /* number of filter files */
static OBJECT filter_active; /* the active filter file records */
static OBJECT filter_in_filename; /* initial name of filter input file */
static OBJECT filter_out_filename; /* initial name of filter ouput file */
/*****************************************************************************/
/* */
/* FilterInit() */
/* */
/* Initialize this module. */
/* */
/*****************************************************************************/
void FilterInit(void)
{ filter_count = 0;
New(filter_active, ACAT);
sym_body(FilterInSym) = MakeWord(WORD, FILTER_IN, no_fpos);
sym_body(FilterOutSym) = MakeWord(WORD, FILTER_OUT, no_fpos);
sym_body(FilterErrSym) = MakeWord(WORD, FILTER_ERR, no_fpos);
filter_in_filename = sym_body(FilterInSym);
filter_out_filename = sym_body(FilterOutSym);
} /* end FilterInit */
/*@::FilterCreate(), FilterSetFileNames()@************************************/
/* */
/* OBJECT FilterCreate(use_begin, act, xfpos) */
/* */
/* Create and return a new FILTERED object. Open the corresponding file */
/* for writing and dump the parameter text to be filtered into it. */
/* */
/*****************************************************************************/
OBJECT FilterCreate(BOOLEAN use_begin, OBJECT act, FILE_POS *xfpos)
{ FULL_CHAR buff[MAX_LINE]; FILE *fp; OBJECT x, res, junk;
debug3(DFH, D, "FilterCreate(%s, %s, %s)", bool(use_begin),
SymName(act), EchoFilePos(xfpos));
New(res, FILTERED);
FposCopy(fpos(res), *xfpos);
++filter_count;
sprintf( (char *) buff, "%s%d", FILTER_IN, filter_count);
fp = StringFOpen(buff, WRITE_TEXT);
if( fp == NULL )
Error(40, 1, "cannot open temporary filter file %s", FATAL, xfpos, buff);
x = MakeWord(WORD, buff, xfpos);
filter_use_begin(x) = use_begin;
filter_actual(x) = act;
Link(res, x);
Link(filter_active, x);
junk = LexScanVerbatim(fp, use_begin, xfpos, FALSE);
fclose(fp);
sprintf( (char *) buff, "%s%d", FILTER_OUT, filter_count);
x = MakeWord(WORD, buff, xfpos);
Link(res, x);
debug2(DFH, D, "FilterCreate returning %d %s", (int) res, EchoObject(res));
return res;
} /* end FilterCreate */
/*****************************************************************************/
/* */
/* FilterSetFileNames(x) */
/* */
/* Set @FilterIn, @FilterOut, and @FilterErr to suitable values for the */
/* manifesting of the command which runs filter x. */
/* */
/*****************************************************************************/
void FilterSetFileNames(OBJECT x)
{ OBJECT y;
assert( type(x) == FILTERED, "FilterSetFileNames: type(x)!" );
assert( Down(x) != x, "FilterSetFileNames: x has no children!" );
debug2(DFH, D, "FilterSetFileNames(%d %s)", (int) x, EchoObject(x));
Child(y, Down(x));
assert( type(y) == WORD, "FilterSetFileNames: type(y)!" );
sym_body(FilterInSym) = y;
Child(y, NextDown(Down(x)));
assert( type(y) == WORD, "FilterSetFileNames: type(y) (2)!" );
sym_body(FilterOutSym) = y;
debug0(DFH, D, "FilterSetFileNames returning.");
} /* end FilterSetFileNames */
/*@::FilterExecute()@*********************************************************/
/* */
/* OBJECT FilterExecute(x, command, env) */
/* */
/* Execute the filter command on FILTERED object x, and return the result. */
/* */
/*****************************************************************************/
OBJECT FilterExecute(OBJECT x, FULL_CHAR *command, OBJECT env)
{ int i, count, status; OBJECT t, res; char line[MAX_LINE];
FILE *err_fp; FILE_NUM filter_out_file;
assert( type(x) == FILTERED, "FilterExecute: type(x)!" );
assert( type(env) == ENV, "FilterExecute: type(env)!" );
debug4(DFH, D, "FilterExecute(%d %s, \"%s\", %s)", (int) x, EchoObject(x),
command, EchoObject(env));
/* reset FilterInSym since Manifest of @Filter is now complete */
sym_body(FilterInSym) = filter_in_filename;
if( SafeExecution )
{
/* if safe execution, print error message and return empty object */
Error(40, 2, "safe execution prohibiting command: %s", WARN, &fpos(x),
command);
res = MakeWord(WORD, STR_EMPTY, &fpos(x));
}
else
{
/* execute the command, echo error messages, and exit if status problem */
status = system( (char *) command);
err_fp = StringFOpen(FILTER_ERR, READ_TEXT);
if( err_fp != NULL )
{ while( fgets(line, MAX_LINE, err_fp) != NULL )
{ if( line[strlen(line)-1] == '\n' )
line[strlen(line)-1] = '\0';
Error(40, 3, "%s", WARN, &fpos(x), line);
}
fclose(err_fp);
StringRemove(FILTER_ERR);
}
if( status != 0 )
Error(40, 4, "failure (non-zero status) of filter: %s",
FATAL, &fpos(x), command);
/* read in output of system command as a Lout object */
SwitchScope(nilobj);
count = 0;
SetScope(env, &count, TRUE);
debug0(DFS, D, " calling DefineFile from FilterExecute");
filter_out_file =
DefineFile(string(sym_body(FilterOutSym)), STR_EMPTY, &fpos(x),
FILTER_FILE, SOURCE_PATH);
LexPush(filter_out_file, 0, FILTER_FILE, 1, FALSE);
t = NewToken(BEGIN, &fpos(x), 0, 0, BEGIN_PREC, FilterOutSym);
res = Parse(&t, nilobj, FALSE, FALSE);
LexPop();
for( i = 1; i <= count; i++ ) PopScope();
UnSwitchScope(nilobj);
StringRemove(string(sym_body(FilterOutSym)));
sym_body(FilterOutSym) = filter_out_filename;
}
debug1(DFH, D, "FilterExecute returning %s", EchoObject(res));
return res;
} /* end FilterExecute */
/*@::FilterWrite(), FilterScavenge()@*****************************************/
/* */
/* FilterWrite(x, fp, linecount) */
/* */
/* Write out the active FILTERED object x by copying the file. */
/* Increment *linecount by the number of lines written. */
/* */
/*****************************************************************************/
void FilterWrite(OBJECT x, FILE *fp, int *linecount)
{ FILE *in_fp; OBJECT y; int ch;
assert( type(x) == FILTERED, "FilterWrite: type(x)!" );
debug2(DFH, D, "[ FilterWrite(%d %s, fp)", (int) x, EchoObject(x));
Child(y, Down(x));
in_fp = StringFOpen(string(y), READ_TEXT);
if( in_fp == NULL )
Error(40, 5, "cannot read filter temporary file %s",
FATAL, &fpos(x), string(y));
if( filter_use_begin(y) )
{ StringFPuts(KW_BEGIN, fp);
StringFPuts("\n", fp);
*linecount += 1;
while( (ch = getc(in_fp)) != EOF )
{ putc(ch, fp);
if( ch == '\n' ) *linecount += 1;
}
StringFPuts(KW_END, fp);
StringFPuts(" ", fp);
StringFPuts(SymName(filter_actual(y)), fp);
}
else
{ StringFPuts(KW_LBR, fp);
StringFPuts("\n", fp);
*linecount += 1;
while( (ch = getc(in_fp)) != EOF )
{ putc(ch, fp);
ifdebug(DFH, D, putc(ch, stderr));
if( ch == '\n' ) *linecount += 1;
}
StringFPuts(KW_RBR, fp);
}
StringFPuts("\n", fp);
*linecount += 1;
fclose(in_fp);
debug0(DFH, D, "] FilterWrite returning.");
} /* end FilterWrite */
/*****************************************************************************/
/* */
/* FilterScavenge(all) */
/* */
/* Unlink unneeded filter files, or all remaining filter files if all. */
/* */
/*****************************************************************************/
void FilterScavenge(BOOLEAN all)
{ OBJECT y, link, nextlink;
debug1(DFH, D, "FilterScavenge(%s)", bool(all));
for( link = Down(filter_active); link != filter_active; link = nextlink )
{ Child(y, link);
nextlink = NextDown(link);
if( all || Up(y) == LastUp(y) )
{ debug1(DFH, D, "FilterScavenge scavenging %s", string(y));
StringRemove(string(y));
DisposeChild(link);
}
}
debug0(DFH, D, "FilterScavenge returning.");
} /* end FilterScavenge */
|
