-
Notifications
You must be signed in to change notification settings - Fork 0
/
lib.cpp
379 lines (362 loc) · 11 KB
/
lib.cpp
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
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
/**
* based on stripcomments.c, written by Stephan Beal (stephan@wanderinghorse.net),
* which is in the public domain. Thanks mate.
*/
/*
* NB. things like (ignoring (pad))
* /\(pad)
*(pad)/ c++ comment
* (a dumb way to write C++ comments)
*
* or
*
* /\(pad)
*(pad)*
* (a dumb way to write ANSI C comments)
*
* will NOT be implemented. not just because it makes the processing
* logic unnecessarily more complex, but also because apart from GCC,
* most preprocessors do not implement it either, or warn against it.
* and why would they? it's hare-brained, to put it mildly.
*/
#include <cassert>
#include "rmcpp.h"
void CommentStripper::initdefaults()
{
m_state = CT_UNDEF;
m_prevch = EOF;
m_currch = EOF;
m_peekch = EOF;
m_posline = 1;
m_poscol = 0;
m_pascalnest = 0;
m_pascalbrace = false;
m_incomment = false;
}
bool CommentStripper::is_space()
{
if(m_currch == '\n')
{
if((m_peekch == '\r') || (m_peekch == '\n'))
{
return true;
}
return false;
}
return (
(m_currch == ' ') ||
(m_currch == '\t')
);
}
void CommentStripper::do_skipemptylines()
{
while(true)
{
if((m_currch == '\n') && ((m_peekch == '\r') || (m_peekch == '\n')))
{
m_currch = more();
}
else
{
return;
}
}
}
bool CommentStripper::is_pascalcomm_begin()
{
return (
/*
* pascal has two kinds of block comments:
*
* (* traditional comments, derived from modula *)
*
* and
*
* { these things }
*
* both are valid, although the ISO standard only talks about (* these *).
* since they can be nested, they also need to be tracked (see CT_PASCALCOMM).
*/
(('(' == m_currch) && ('*' == m_peekch)) ||
('{' == m_currch)
);
}
CommentStripper::CommentStripper(const Options& opts, std::istream* infp):
m_opts(opts), m_infp(infp)
{
initdefaults();
}
int CommentStripper::more()
{
// store previous character
m_prevch = m_currch;
// get current character
m_currch = m_infp->get();
// store next character, without advancing stream
m_peekch = peek();
// ignore carriage returns
if(m_currch == '\r')
{
return more();
}
if(m_currch == '\n')
{
m_posline++;
m_poscol = 0;
}
m_poscol++;
return m_currch;
}
int CommentStripper::peek()
{
return m_infp->peek();
}
void CommentStripper::forward_comment(State st, char ch)
{
if(m_oncommentcb)
{
if(!m_oncommentcb(st, ch))
{
m_oncommentcb = nullptr;
}
}
}
void CommentStripper::forward_comment(State st, const std::string& str)
{
for(char ch: str)
{
forward_comment(st, ch);
}
}
void CommentStripper::onComment(OnCommentCallback cb)
{
m_oncommentcb = cb;
}
bool CommentStripper::run(std::ostream& outfp)
{
int quote;
int morech;
int state3Col;
long startLine;
long startCol;
bool escaped;
bool endOfString;
state3Col = -99;
while(true)
{
m_prevch = m_currch;
m_currch = more();
if(m_currch == EOF)
{
return true;
}
switch(m_state)
{
case CT_UNDEF:
if('\'' == m_currch || '"' == m_currch)
{
/* Read string literal...
needed to properly catch comments in strings. */
quote = m_currch;
startLine = m_posline;
startCol = m_poscol;
escaped = false;
endOfString = false;
outfp.put(m_currch);
while(true)
{
if(endOfString == true)
{
break;
}
morech = more();
if(morech == EOF)
{
break;
}
switch(morech)
{
case '\\':
escaped = !escaped;
break;
case '\'':
case '"':
if(!escaped && quote == morech)
{
endOfString = true;
}
escaped = false;
break;
default:
escaped = false;
break;
}
outfp.put(morech);
}
if(EOF == morech)
{
warn("unexpected end-of-file while reading %s literal, starting on line %d, column %d",
(('"' == m_currch) ? "string" : "char"),
startLine,
startCol
);
return false;
}
break;
}
else if('/' == m_currch)
{
m_state = CT_FWDSLASH;
break;
}
else if(m_opts.remove_hashcomments && (m_currch == '#'))
{
m_state = CT_HASHCOMM;
m_incomment = true;
break;
}
else if(m_opts.remove_pascalcomments && is_pascalcomm_begin())
{
dbg("begin pascalcomment");
if(m_currch == '{')
{
m_pascalbrace = true;
}
m_state = CT_PASCALCOMM;
m_incomment = true;
break;
}
else if(is_space() && m_opts.remove_emptylines)
{
do_skipemptylines();
if(m_currch == EOF)
{
return false;
}
}
else
{
dbg("???how did we end up here???");
}
outfp.put(m_currch);
break;
case CT_FWDSLASH: /* 1 slash */
/*
* huge kludge for odd corner case:
*/
/*/ <--- here.
* state3Col marks the source column in which a C-style
* comment starts, so that it can tell if star-slash inside a
* C-style comment is the end of the comment or is the weird corner
* case marked at the start of _this_ comment block.
* see also CT_ANSICOMM.
*/
if(('*' == m_currch) && (m_opts.remove_ansicomments == true))
{
m_state = CT_ANSICOMM;
m_incomment = true;
state3Col = m_poscol - 1;
forward_comment(m_state, "/*");
break;
}
if(('/' == m_currch) && ((m_opts.remove_cppcomments || m_opts.do_convertcpp)))
{
m_state = CT_CPPCOMM;
m_incomment = true;
if(m_opts.do_convertcpp)
{
outfp << "/*";
}
else
{
forward_comment(m_state, "//");
}
break;
}
/* It wasn't a comment after all. */
m_state = CT_UNDEF;
m_incomment = false;
outfp.put(m_prevch);
outfp.put(m_currch);
break;
/* C++ comment */
case CT_CPPCOMM:
case CT_HASHCOMM:
forward_comment(m_state, m_currch);
if('\n' == m_currch)
{
if((m_state == CT_CPPCOMM) && (m_opts.do_convertcpp == true))
{
outfp << "*/";
}
m_state = CT_UNDEF;
m_incomment = false;
outfp.put(m_currch);
forward_comment(CT_UNDEF, 0);
}
else if(m_incomment && m_opts.do_convertcpp)
{
outfp.put(m_currch);
}
break;
case CT_ANSICOMM: /* C comment */
dbg("in ansicomment: currch=%q", char(m_currch));
forward_comment(m_state, m_currch);
if('/' == m_currch)
{
if('*' == m_prevch)
{
/* Corner case which breaks this: */
/*/ <-- slash there */
/* That shows up twice in a piece of 3rd-party
code i use. */
/* And thus state3Col was introduced :/ */
if(m_poscol != (state3Col + 2))
{
m_incomment = false;
m_state = CT_UNDEF;
state3Col = -99;
forward_comment(CT_UNDEF, 0);
}
}
}
break;
case CT_PASCALCOMM:
dbg("in pascalcomment: currch=%q", char(m_currch));
forward_comment(m_state, m_currch);
if((('*' == m_prevch) && (')' == m_currch)) || (m_pascalbrace && (m_currch == '}')))
{
if(m_pascalnest == 0)
{
if(m_pascalbrace)
{
m_pascalbrace = false;
}
dbg("end pascalcomment");
m_incomment = false;
m_state = CT_UNDEF;
forward_comment(m_state, 0);
}
else
{
warn("in pascalcomment: unnesting from level %d", m_pascalnest);
m_pascalnest--;
}
}
else if((('(' == m_currch) && (m_peekch == '*')) || (m_pascalbrace && (m_currch == '{')))
{
m_pascalnest += 1;
warn("in pascalcomment: nested comment level %d detected! this may likely break", m_pascalnest);
}
break;
default:
assert(!"impossible!");
break;
}
if('\n' == m_currch)
{
state3Col = -99;
}
}
return true;
}