summaryrefslogtreecommitdiffstats
path: root/usr.bin/indent/pr_comment.c
blob: 9524bf404f1900177216b7d46f0ab6ee58852ab2 (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
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
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
/*
 * Copyright (c) 1985 Sun Microsystems, Inc.
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#if 0
#ifndef lint
static char sccsid[] = "@(#)pr_comment.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include "indent_globs.h"
#include "indent.h"
/*
 * NAME:
 *	pr_comment
 *
 * FUNCTION:
 *	This routine takes care of scanning and printing comments.
 *
 * ALGORITHM:
 *	1) Decide where the comment should be aligned, and if lines should
 *	   be broken.
 *	2) If lines should not be broken and filled, just copy up to end of
 *	   comment.
 *	3) If lines should be filled, then scan thru input_buffer copying
 *	   characters to com_buf.  Remember where the last blank, tab, or
 *	   newline was.  When line is filled, print up to last blank and
 *	   continue copying.
 *
 * HISTORY:
 *	November 1976	D A Willcox of CAC	Initial coding
 *	12/6/76		D A Willcox of CAC	Modification to handle
 *						UNIX-style comments
 *
 */

/*
 * this routine processes comments.  It makes an attempt to keep comments from
 * going over the max line length.  If a line is too long, it moves everything
 * from the last blank to the next comment line.  Blanks and tabs from the
 * beginning of the input line are removed
 */

void
pr_comment(void)
{
    int         now_col;	/* column we are in now */
    int         adj_max_col;	/* Adjusted max_col for when we decide to
				 * spill comments over the right margin */
    char       *last_bl;	/* points to the last blank in the output
				 * buffer */
    char       *t_ptr;		/* used for moving string */
    int         unix_comment;	/* tri-state variable used to decide if it is
				 * a unix-style comment. 0 means only blanks
				 * since /+*, 1 means regular style comment, 2
				 * means unix style comment */
    int         break_delim = comment_delimiter_on_blankline;
    int         l_just_saw_decl = ps.just_saw_decl;
    /*
     * int         ps.last_nl = 0;	 true iff the last significant thing
     * weve seen is a newline
     */
    int         one_liner = 1;	/* true iff this comment is a one-liner */
    adj_max_col = max_col;
    ps.just_saw_decl = 0;
    last_bl = 0;		/* no blanks found so far */
    ps.box_com = false;		/* at first, assume that we are not in
					 * a boxed comment or some other
					 * comment that should not be touched */
    ++ps.out_coms;		/* keep track of number of comments */
    unix_comment = 1;		/* set flag to let us figure out if there is a
				 * unix-style comment ** DISABLED: use 0 to
				 * reenable this hack! */

    /* Figure where to align and how to treat the comment */

    if (ps.col_1 && !format_col1_comments) {	/* if comment starts in column
						 * 1 it should not be touched */
	ps.box_com = true;
	ps.com_col = 1;
    }
    else {
	if (*buf_ptr == '-' || *buf_ptr == '*' ||
	    (*buf_ptr == '\n' && !format_block_comments)) {
	    ps.box_com = true;	/* A comment with a '-' or '*' immediately
				 * after the /+* is assumed to be a boxed
				 * comment. A comment with a newline
				 * immediately after the /+* is assumed to
				 * be a block comment and is treated as a
				 * box comment unless format_block_comments
				 * is nonzero (the default). */
	    break_delim = 0;
	}
	if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
	    /* klg: check only if this line is blank */
	    /*
	     * If this (*and previous lines are*) blank, dont put comment way
	     * out at left
	     */
	    ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
	    adj_max_col = block_comment_max_col;
	    if (ps.com_col <= 1)
		ps.com_col = 1 + !format_col1_comments;
	}
	else {
	    int target_col;
	    break_delim = 0;
	    if (s_code != e_code)
		target_col = count_spaces(compute_code_target(), s_code);
	    else {
		target_col = 1;
		if (s_lab != e_lab)
		    target_col = count_spaces(compute_label_target(), s_lab);
	    }
	    ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
	    if (ps.com_col < target_col)
		ps.com_col = ((target_col + 7) & ~7) + 1;
	    if (ps.com_col + 24 > adj_max_col)
		adj_max_col = ps.com_col + 24;
	}
    }
    if (ps.box_com) {
	buf_ptr[-2] = 0;
	ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
	buf_ptr[-2] = '/';
    }
    else {
	ps.n_comment_delta = 0;
	while (*buf_ptr == ' ' || *buf_ptr == '\t')
	    buf_ptr++;
    }
    ps.comment_delta = 0;
    *e_com++ = '/';		/* put '/' followed by '*' into buffer */
    *e_com++ = '*';
    if (*buf_ptr != ' ' && !ps.box_com)
	*e_com++ = ' ';

    *e_com = '\0';
    if (troff) {
	now_col = 1;
	adj_max_col = 80;
    }
    else
	now_col = count_spaces(ps.com_col, s_com);	/* figure what column we
							 * would be in if we
							 * printed the comment
							 * now */

    /* Start to copy the comment */

    while (1) {			/* this loop will go until the comment is
				 * copied */
	if (*buf_ptr > 040 && *buf_ptr != '*')
	    ps.last_nl = 0;
	CHECK_SIZE_COM;
	switch (*buf_ptr) {	/* this checks for various spcl cases */
	case 014:		/* check for a form feed */
	    if (!ps.box_com) {	/* in a text comment, break the line here */
		ps.use_ff = true;
		/* fix so dump_line uses a form feed */
		dump_line();
		last_bl = 0;
		*e_com++ = ' ';
		*e_com++ = '*';
		*e_com++ = ' ';
		while (*++buf_ptr == ' ' || *buf_ptr == '\t');
	    }
	    else {
		if (++buf_ptr >= buf_end)
		    fill_buffer();
		*e_com++ = 014;
	    }
	    break;

	case '\n':
	    if (had_eof) {	/* check for unexpected eof */
		printf("Unterminated comment\n");
		*e_com = '\0';
		dump_line();
		return;
	    }
	    one_liner = 0;
	    if (ps.box_com || ps.last_nl) {	/* if this is a boxed comment,
						 * we dont ignore the newline */
		if (s_com == e_com) {
		    *e_com++ = ' ';
		    *e_com++ = ' ';
		}
		*e_com = '\0';
		if (!ps.box_com && e_com - s_com > 3) {
		    if (break_delim == 1 && s_com[0] == '/'
			    && s_com[1] == '*' && s_com[2] == ' ') {
			char       *t = e_com;
			break_delim = 2;
			e_com = s_com + 2;
			*e_com = 0;
			if (blanklines_before_blockcomments)
			    prefix_blankline_requested = 1;
			dump_line();
			e_com = t;
			s_com[0] = s_com[1] = s_com[2] = ' ';
		    }
		    dump_line();
		    CHECK_SIZE_COM;
		    *e_com++ = ' ';
		    *e_com++ = ' ';
		}
		dump_line();
		now_col = ps.com_col;
	    }
	    else {
		ps.last_nl = 1;
		if (unix_comment != 1) {	/* we not are in unix_style
						 * comment */
		    if (unix_comment == 0 && s_code == e_code) {
			/*
			 * if it is a UNIX-style comment, ignore the
			 * requirement that previous line be blank for
			 * unindention
			 */
			ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
			if (ps.com_col <= 1)
			    ps.com_col = 2;
		    }
		    unix_comment = 2;	/* permanently remember that we are in
					 * this type of comment */
		    dump_line();
		    ++line_no;
		    now_col = ps.com_col;
		    *e_com++ = ' ';
		    /*
		     * fix so that the star at the start of the line will line
		     * up
		     */
		    do		/* flush leading white space */
			if (++buf_ptr >= buf_end)
			    fill_buffer();
		    while (*buf_ptr == ' ' || *buf_ptr == '\t');
		    break;
		}
		if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
		    last_bl = e_com - 1;
		/*
		 * if there was a space at the end of the last line, remember
		 * where it was
		 */
		else {		/* otherwise, insert one */
		    last_bl = e_com;
		    CHECK_SIZE_COM;
		    *e_com++ = ' ';
		    ++now_col;
		}
	    }
	    ++line_no;		/* keep track of input line number */
	    if (!ps.box_com) {
		int         nstar = 1;
		do {		/* flush any blanks and/or tabs at start of
				 * next line */
		    if (++buf_ptr >= buf_end)
			fill_buffer();
		    if (*buf_ptr == '*' && --nstar >= 0) {
			if (++buf_ptr >= buf_end)
			    fill_buffer();
			if (*buf_ptr == '/')
			    goto end_of_comment;
		    }
		} while (*buf_ptr == ' ' || *buf_ptr == '\t');
	    }
	    else if (++buf_ptr >= buf_end)
		fill_buffer();
	    break;		/* end of case for newline */

	case '*':		/* must check for possibility of being at end
				 * of comment */
	    if (++buf_ptr >= buf_end)	/* get to next char after * */
		fill_buffer();

	    if (unix_comment == 0)	/* set flag to show we are not in
					 * unix-style comment */
		unix_comment = 1;

	    if (*buf_ptr == '/') {	/* it is the end!!! */
	end_of_comment:
		if (++buf_ptr >= buf_end)
		    fill_buffer();

		if (*(e_com - 1) != ' ' && !ps.box_com) {	/* insure blank before
								 * end */
		    *e_com++ = ' ';
		    ++now_col;
		}
		if (break_delim == 1 && !one_liner && s_com[0] == '/'
			&& s_com[1] == '*' && s_com[2] == ' ') {
		    char       *t = e_com;
		    break_delim = 2;
		    e_com = s_com + 2;
		    *e_com = 0;
		    if (blanklines_before_blockcomments)
			prefix_blankline_requested = 1;
		    dump_line();
		    e_com = t;
		    s_com[0] = s_com[1] = s_com[2] = ' ';
		}
		if (break_delim == 2 && e_com > s_com + 3
			 /* now_col > adj_max_col - 2 && !ps.box_com */ ) {
		    *e_com = '\0';
		    dump_line();
		    now_col = ps.com_col;
		}
		CHECK_SIZE_COM;
		*e_com++ = '*';
		*e_com++ = '/';
		*e_com = '\0';
		ps.just_saw_decl = l_just_saw_decl;
		return;
	    }
	    else {		/* handle isolated '*' */
		*e_com++ = '*';
		++now_col;
	    }
	    break;
	default:		/* we have a random char */
	    if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
		unix_comment = 1;	/* we are not in unix-style comment */

	    *e_com = *buf_ptr++;
	    if (buf_ptr >= buf_end)
		fill_buffer();

	    if (*e_com == '\t')	/* keep track of column */
		now_col = ((now_col - 1) & tabmask) + tabsize + 1;
	    else if (*e_com == '\b')	/* this is a backspace */
		--now_col;
	    else
		++now_col;

	    if (*e_com == ' ' || *e_com == '\t')
		last_bl = e_com;
	    /* remember we saw a blank */

	    ++e_com;
	    if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') {
		/*
		 * the comment is too long, it must be broken up
		 */
		if (break_delim == 1 && s_com[0] == '/'
			&& s_com[1] == '*' && s_com[2] == ' ') {
		    char       *t = e_com;
		    break_delim = 2;
		    e_com = s_com + 2;
		    *e_com = 0;
		    if (blanklines_before_blockcomments)
			prefix_blankline_requested = 1;
		    dump_line();
		    e_com = t;
		    s_com[0] = s_com[1] = s_com[2] = ' ';
		}
		if (last_bl == 0) {	/* we have seen no blanks */
		    last_bl = e_com;	/* fake it */
		    *e_com++ = ' ';
		}
		*e_com = '\0';	/* print what we have */
		*last_bl = '\0';
		while (last_bl > s_com && last_bl[-1] < 040)
		    *--last_bl = 0;
		e_com = last_bl;
		dump_line();

		*e_com++ = ' ';	/* add blanks for continuation */
		*e_com++ = ' ';
		*e_com++ = ' ';

		t_ptr = last_bl + 1;
		last_bl = 0;
		if (t_ptr >= e_com) {
		    while (*t_ptr == ' ' || *t_ptr == '\t')
			t_ptr++;
		    while (*t_ptr != '\0') {	/* move unprinted part of
						 * comment down in buffer */
			if (*t_ptr == ' ' || *t_ptr == '\t')
			    last_bl = e_com;
			*e_com++ = *t_ptr++;
		    }
		}
		*e_com = '\0';
		now_col = count_spaces(ps.com_col, s_com);	/* recompute current
								 * position */
	    }
	    break;
	}
    }
}
OpenPOWER on IntegriCloud