usr.bin/indent/pr_comment.c

   1 /*-
   2  * Copyright (c) 1985 Sun Microsystems, Inc.
   3  * Copyright (c) 1980, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #if 0
  37 #ifndef lint
  38 static char sccsid[] = "@(#)pr_comment.c        8.1 (Berkeley) 6/6/93";
  39 #endif /* not lint */
  40 #endif
  41
  42 #include <sys/cdefs.h>
  43 __FBSDID("$FreeBSD$");
  44
  45 #include <err.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include "indent_globs.h"
  50 #include "indent.h"
  51 /*
  52  * NAME:
  53  *      pr_comment
  54  *
  55  * FUNCTION:
  56  *      This routine takes care of scanning and printing comments.
  57  *
  58  * ALGORITHM:
  59  *      1) Decide where the comment should be aligned, and if lines should
  60  *         be broken.
  61  *      2) If lines should not be broken and filled, just copy up to end of
  62  *         comment.
  63  *      3) If lines should be filled, then scan thru input_buffer copying
  64  *         characters to com_buf.  Remember where the last blank, tab, or
  65  *         newline was.  When line is filled, print up to last blank and
  66  *         continue copying.
  67  *
  68  * HISTORY:
  69  *      November 1976   D A Willcox of CAC      Initial coding
  70  *      12/6/76         D A Willcox of CAC      Modification to handle
  71  *                                              UNIX-style comments
  72  *
  73  */\f
  74
  75 /*
  76  * this routine processes comments.  It makes an attempt to keep comments from
  77  * going over the max line length.  If a line is too long, it moves everything
  78  * from the last blank to the next comment line.  Blanks and tabs from the
  79  * beginning of the input line are removed
  80  */
  81
  82 void
  83 pr_comment(void)
  84 {
  85     int         now_col;        /* column we are in now */
  86     int         adj_max_col;    /* Adjusted max_col for when we decide to
  87                                  * spill comments over the right margin */
  88     char       *last_bl;        /* points to the last blank in the output
  89                                  * buffer */
  90     char       *t_ptr;          /* used for moving string */
  91     int         break_delim = comment_delimiter_on_blankline;
  92     int         l_just_saw_decl = ps.just_saw_decl;
  93     adj_max_col = max_col;
  94     ps.just_saw_decl = 0;
  95     last_bl = NULL;             /* no blanks found so far */
  96     ps.box_com = false;         /* at first, assume that we are not in
  97                                          * a boxed comment or some other
  98                                          * comment that should not be touched */
  99     ++ps.out_coms;              /* keep track of number of comments */
 100
 101     /* Figure where to align and how to treat the comment */
 102
 103     if (ps.col_1 && !format_col1_comments) {    /* if comment starts in column
 104                                                  * 1 it should not be touched */
 105         ps.box_com = true;
 106         break_delim = false;
 107         ps.com_col = 1;
 108     }
 109     else {
 110         if (*buf_ptr == '-' || *buf_ptr == '*' ||
 111             (*buf_ptr == '\n' && !format_block_comments)) {
 112             ps.box_com = true;  /* A comment with a '-' or '*' immediately
 113                                  * after the /+* is assumed to be a boxed
 114                                  * comment. A comment with a newline
 115                                  * immediately after the /+* is assumed to
 116                                  * be a block comment and is treated as a
 117                                  * box comment unless format_block_comments
 118                                  * is nonzero (the default). */
 119             break_delim = false;
 120         }
 121         if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
 122             /* klg: check only if this line is blank */
 123             /*
 124              * If this (*and previous lines are*) blank, dont put comment way
 125              * out at left
 126              */
 127             ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
 128             adj_max_col = block_comment_max_col;
 129             if (ps.com_col <= 1)
 130                 ps.com_col = 1 + !format_col1_comments;
 131         }
 132         else {
 133             int target_col;
 134             break_delim = false;
 135             if (s_code != e_code)
 136                 target_col = count_spaces(compute_code_target(), s_code);
 137             else {
 138                 target_col = 1;
 139                 if (s_lab != e_lab)
 140                     target_col = count_spaces(compute_label_target(), s_lab);
 141             }
 142             ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
 143             if (ps.com_col < target_col)
 144                 ps.com_col = ((target_col + 7) & ~7) + 1;
 145             if (ps.com_col + 24 > adj_max_col)
 146                 adj_max_col = ps.com_col + 24;
 147         }
 148     }
 149     if (ps.box_com) {
 150         buf_ptr[-2] = 0;
 151         ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
 152         buf_ptr[-2] = '/';
 153     }
 154     else {
 155         ps.n_comment_delta = 0;
 156         while (*buf_ptr == ' ' || *buf_ptr == '\t')
 157             buf_ptr++;
 158     }
 159     ps.comment_delta = 0;
 160     *e_com++ = '/';             /* put '/' followed by '*' into buffer */
 161     *e_com++ = '*';
 162     if (*buf_ptr != ' ' && !ps.box_com)
 163         *e_com++ = ' ';
 164
 165     /* Don't put a break delimiter if this comment is a one-liner */
 166     for (t_ptr = buf_ptr; *t_ptr != '\0' && *t_ptr != '\n'; t_ptr++) {
 167         if (t_ptr >= buf_end)
 168             fill_buffer();
 169         if (t_ptr[0] == '*' && t_ptr[1] == '/') {
 170             break_delim = false;
 171             break;
 172         }
 173     }
 174
 175     if (break_delim) {
 176         char       *t = e_com;
 177         e_com = s_com + 2;
 178         *e_com = 0;
 179         if (blanklines_before_blockcomments)
 180             prefix_blankline_requested = 1;
 181         dump_line();
 182         e_com = s_com = t;
 183         if (!ps.box_com && star_comment_cont)
 184             *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 185     }
 186
 187     if (troff)
 188         adj_max_col = 80;
 189
 190     /* Start to copy the comment */
 191
 192     while (1) {                 /* this loop will go until the comment is
 193                                  * copied */
 194         CHECK_SIZE_COM;
 195         switch (*buf_ptr) {     /* this checks for various spcl cases */
 196         case 014:               /* check for a form feed */
 197             if (!ps.box_com) {  /* in a text comment, break the line here */
 198                 ps.use_ff = true;
 199                 /* fix so dump_line uses a form feed */
 200                 dump_line();
 201                 last_bl = NULL;
 202                 if (!ps.box_com && star_comment_cont)
 203                     *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 204                 while (*++buf_ptr == ' ' || *buf_ptr == '\t')
 205                     ;
 206             }
 207             else {
 208                 if (++buf_ptr >= buf_end)
 209                     fill_buffer();
 210                 *e_com++ = 014;
 211             }
 212             break;
 213
 214         case '\n':
 215             if (had_eof) {      /* check for unexpected eof */
 216                 printf("Unterminated comment\n");
 217                 dump_line();
 218                 return;
 219             }
 220             last_bl = NULL;
 221             if (ps.box_com || ps.last_nl) {     /* if this is a boxed comment,
 222                                                  * we dont ignore the newline */
 223                 if (s_com == e_com)
 224                     *e_com++ = ' ';
 225                 if (!ps.box_com && e_com - s_com > 3) {
 226                     dump_line();
 227                     if (star_comment_cont)
 228                         *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 229                 }
 230                 dump_line();
 231                 if (!ps.box_com && star_comment_cont)
 232                     *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 233             }
 234             else {
 235                 ps.last_nl = 1;
 236                 if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
 237                     last_bl = e_com - 1;
 238                 /*
 239                  * if there was a space at the end of the last line, remember
 240                  * where it was
 241                  */
 242                 else {          /* otherwise, insert one */
 243                     last_bl = e_com;
 244                     CHECK_SIZE_COM;
 245                     *e_com++ = ' ';
 246                 }
 247             }
 248             ++line_no;          /* keep track of input line number */
 249             if (!ps.box_com) {
 250                 int         nstar = 1;
 251                 do {            /* flush any blanks and/or tabs at start of
 252                                  * next line */
 253                     if (++buf_ptr >= buf_end)
 254                         fill_buffer();
 255                     if (*buf_ptr == '*' && --nstar >= 0) {
 256                         if (++buf_ptr >= buf_end)
 257                             fill_buffer();
 258                         if (*buf_ptr == '/')
 259                             goto end_of_comment;
 260                     }
 261                 } while (*buf_ptr == ' ' || *buf_ptr == '\t');
 262             }
 263             else if (++buf_ptr >= buf_end)
 264                 fill_buffer();
 265             break;              /* end of case for newline */
 266
 267         case '*':               /* must check for possibility of being at end
 268                                  * of comment */
 269             if (++buf_ptr >= buf_end)   /* get to next char after * */
 270                 fill_buffer();
 271
 272             if (*buf_ptr == '/') {      /* it is the end!!! */
 273         end_of_comment:
 274                 if (++buf_ptr >= buf_end)
 275                     fill_buffer();
 276                 CHECK_SIZE_COM;
 277                 if (break_delim) {
 278                     if (e_com > s_com + 3) {
 279                         dump_line();
 280                     }
 281                     else
 282                         s_com = e_com;
 283                     *e_com++ = ' ';
 284                 }
 285                 if (e_com[-1] != ' ' && !ps.box_com)
 286                     *e_com++ = ' ';     /* ensure blank before end */
 287                 *e_com++ = '*', *e_com++ = '/', *e_com = '\0';
 288                 ps.just_saw_decl = l_just_saw_decl;
 289                 return;
 290             }
 291             else                /* handle isolated '*' */
 292                 *e_com++ = '*';
 293             break;
 294         default:                /* we have a random char */
 295             now_col = count_spaces_until(ps.com_col, s_com, e_com);
 296             do {
 297                 *e_com = *buf_ptr++;
 298                 if (buf_ptr >= buf_end)
 299                     fill_buffer();
 300                 if (*e_com == ' ' || *e_com == '\t')
 301                     last_bl = e_com;    /* remember we saw a blank */
 302                 ++e_com;
 303                 now_col++;
 304             } while (!memchr("*\n\r\b\t", *buf_ptr, 6) &&
 305                 (now_col <= adj_max_col || !last_bl));
 306             ps.last_nl = false;
 307             if (now_col > adj_max_col && !ps.box_com && e_com[-1] > ' ') {
 308                 /*
 309                  * the comment is too long, it must be broken up
 310                  */
 311                 if (last_bl == NULL) {
 312                     dump_line();
 313                     if (!ps.box_com && star_comment_cont)
 314                         *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 315                     break;
 316                 }
 317                 *e_com = '\0';
 318                 e_com = last_bl;
 319                 dump_line();
 320                 if (!ps.box_com && star_comment_cont)
 321                     *e_com++ = ' ', *e_com++ = '*', *e_com++ = ' ';
 322                 for (t_ptr = last_bl + 1; *t_ptr == ' ' || *t_ptr == '\t';
 323                     t_ptr++)
 324                         ;
 325                 last_bl = NULL;
 326                 while (*t_ptr != '\0') {
 327                     if (*t_ptr == ' ' || *t_ptr == '\t')
 328                         last_bl = e_com;
 329                     *e_com++ = *t_ptr++;
 330                 }
 331             }
 332             break;
 333         }
 334     }
 335 }