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  * @(#)pr_comment.c     8.1 (Berkeley) 6/6/93
  36  * $FreeBSD: src/usr.bin/indent/pr_comment.c,v 1.8 2003/06/15 09:28:17 charnier Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include "indent_globs.h"
  43 #include "indent.h"
  44 /*
  45  * NAME:
  46  *      pr_comment
  47  *
  48  * FUNCTION:
  49  *      This routine takes care of scanning and printing comments.
  50  *
  51  * ALGORITHM:
  52  *      1) Decide where the comment should be aligned, and if lines should
  53  *         be broken.
  54  *      2) If lines should not be broken and filled, just copy up to end of
  55  *         comment.
  56  *      3) If lines should be filled, then scan thru input_buffer copying
  57  *         characters to com_buf.  Remember where the last blank, tab, or
  58  *         newline was.  When line is filled, print up to last blank and
  59  *         continue copying.
  60  *
  61  * HISTORY:
  62  *      November 1976   D A Willcox of CAC      Initial coding
  63  *      12/6/76         D A Willcox of CAC      Modification to handle
  64  *                                              UNIX-style comments
  65  *
  66  */\f
  67
  68 /*
  69  * this routine processes comments.  It makes an attempt to keep comments from
  70  * going over the max line length.  If a line is too long, it moves everything
  71  * from the last blank to the next comment line.  Blanks and tabs from the
  72  * beginning of the input line are removed
  73  */
  74
  75 void
  76 pr_comment(void)
  77 {
  78     int         now_col;        /* column we are in now */
  79     int         adj_max_col;    /* Adjusted max_col for when we decide to
  80                                  * spill comments over the right margin */
  81     char       *last_bl;        /* points to the last blank in the output
  82                                  * buffer */
  83     char       *t_ptr;          /* used for moving string */
  84     int         unix_comment;   /* tri-state variable used to decide if it is
  85                                  * a unix-style comment. 0 means only blanks
  86                                  * since /+*, 1 means regular style comment, 2
  87                                  * means unix style comment */
  88     int         break_delim = comment_delimiter_on_blankline;
  89     int         l_just_saw_decl = ps.just_saw_decl;
  90     /*
  91      * int         ps.last_nl = 0;       true iff the last significant thing
  92      * weve seen is a newline
  93      */
  94     int         one_liner = 1;  /* true iff this comment is a one-liner */
  95     adj_max_col = max_col;
  96     ps.just_saw_decl = 0;
  97     last_bl = NULL;             /* no blanks found so far */
  98     ps.box_com = false;         /* at first, assume that we are not in
  99                                          * a boxed comment or some other
 100                                          * comment that should not be touched */
 101     ++ps.out_coms;              /* keep track of number of comments */
 102     unix_comment = 1;           /* set flag to let us figure out if there is a
 103                                  * unix-style comment ** DISABLED: use 0 to
 104                                  * reenable this hack! */
 105
 106     /* Figure where to align and how to treat the comment */
 107
 108     if (ps.col_1 && !format_col1_comments) {    /* if comment starts in column
 109                                                  * 1 it should not be touched */
 110         ps.box_com = true;
 111         ps.com_col = 1;
 112     }
 113     else {
 114         if (*buf_ptr == '-' || *buf_ptr == '*' ||
 115             (*buf_ptr == '\n' && !format_block_comments)) {
 116             ps.box_com = true;  /* A comment with a '-' or '*' immediately
 117                                  * after the /+* is assumed to be a boxed
 118                                  * comment. A comment with a newline
 119                                  * immediately after the /+* is assumed to
 120                                  * be a block comment and is treated as a
 121                                  * box comment unless format_block_comments
 122                                  * is nonzero (the default). */
 123             break_delim = 0;
 124         }
 125         if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
 126             /* klg: check only if this line is blank */
 127             /*
 128              * If this (*and previous lines are*) blank, dont put comment way
 129              * out at left
 130              */
 131             ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
 132             adj_max_col = block_comment_max_col;
 133             if (ps.com_col <= 1)
 134                 ps.com_col = 1 + !format_col1_comments;
 135         }
 136         else {
 137             int target_col;
 138             break_delim = 0;
 139             if (s_code != e_code)
 140                 target_col = count_spaces(compute_code_target(), s_code);
 141             else {
 142                 target_col = 1;
 143                 if (s_lab != e_lab)
 144                     target_col = count_spaces(compute_label_target(), s_lab);
 145             }
 146             ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
 147             if (ps.com_col < target_col)
 148                 ps.com_col = ((target_col + 7) & ~7) + 1;
 149             if (ps.com_col + 24 > adj_max_col)
 150                 adj_max_col = ps.com_col + 24;
 151         }
 152     }
 153     if (ps.box_com) {
 154         buf_ptr[-2] = 0;
 155         ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
 156         buf_ptr[-2] = '/';
 157     }
 158     else {
 159         ps.n_comment_delta = 0;
 160         while (*buf_ptr == ' ' || *buf_ptr == '\t')
 161             buf_ptr++;
 162     }
 163     ps.comment_delta = 0;
 164     *e_com++ = '/';             /* put '/' followed by '*' into buffer */
 165     *e_com++ = '*';
 166     if (*buf_ptr != ' ' && !ps.box_com)
 167         *e_com++ = ' ';
 168
 169     *e_com = '\0';
 170     if (troff) {
 171         now_col = 1;
 172         adj_max_col = 80;
 173     }
 174     else
 175         now_col = count_spaces(ps.com_col, s_com);      /* figure what column we
 176                                                          * would be in if we
 177                                                          * printed the comment
 178                                                          * now */
 179
 180     /* Start to copy the comment */
 181
 182     while (1) {                 /* this loop will go until the comment is
 183                                  * copied */
 184         if (*buf_ptr > 040 && *buf_ptr != '*')
 185             ps.last_nl = 0;
 186         CHECK_SIZE_COM;
 187         switch (*buf_ptr) {     /* this checks for various spcl cases */
 188         case 014:               /* check for a form feed */
 189             if (!ps.box_com) {  /* in a text comment, break the line here */
 190                 ps.use_ff = true;
 191                 /* fix so dump_line uses a form feed */
 192                 dump_line();
 193                 last_bl = NULL;
 194                 *e_com++ = ' ';
 195                 *e_com++ = '*';
 196                 *e_com++ = ' ';
 197                 while (*++buf_ptr == ' ' || *buf_ptr == '\t');
 198             }
 199             else {
 200                 if (++buf_ptr >= buf_end)
 201                     fill_buffer();
 202                 *e_com++ = 014;
 203             }
 204             break;
 205
 206         case '\n':
 207             if (had_eof) {      /* check for unexpected eof */
 208                 printf("Unterminated comment\n");
 209                 *e_com = '\0';
 210                 dump_line();
 211                 return;
 212             }
 213             one_liner = 0;
 214             if (ps.box_com || ps.last_nl) {     /* if this is a boxed comment,
 215                                                  * we dont ignore the newline */
 216                 if (s_com == e_com) {
 217                     *e_com++ = ' ';
 218                     *e_com++ = ' ';
 219                 }
 220                 *e_com = '\0';
 221                 if (!ps.box_com && e_com - s_com > 3) {
 222                     if (break_delim == 1 && s_com[0] == '/'
 223                             && s_com[1] == '*' && s_com[2] == ' ') {
 224                         char       *t = e_com;
 225                         break_delim = 2;
 226                         e_com = s_com + 2;
 227                         *e_com = 0;
 228                         if (blanklines_before_blockcomments)
 229                             prefix_blankline_requested = 1;
 230                         dump_line();
 231                         e_com = t;
 232                         s_com[0] = s_com[1] = s_com[2] = ' ';
 233                     }
 234                     dump_line();
 235                     CHECK_SIZE_COM;
 236                     *e_com++ = ' ';
 237                     *e_com++ = ' ';
 238                 }
 239                 dump_line();
 240                 now_col = ps.com_col;
 241             }
 242             else {
 243                 ps.last_nl = 1;
 244                 if (unix_comment != 1) {        /* we not are in unix_style
 245                                                  * comment */
 246                     if (unix_comment == 0 && s_code == e_code) {
 247                         /*
 248                          * if it is a UNIX-style comment, ignore the
 249                          * requirement that previous line be blank for
 250                          * unindention
 251                          */
 252                         ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
 253                         if (ps.com_col <= 1)
 254                             ps.com_col = 2;
 255                     }
 256                     unix_comment = 2;   /* permanently remember that we are in
 257                                          * this type of comment */
 258                     dump_line();
 259                     ++line_no;
 260                     now_col = ps.com_col;
 261                     *e_com++ = ' ';
 262                     /*
 263                      * fix so that the star at the start of the line will line
 264                      * up
 265                      */
 266                     do          /* flush leading white space */
 267                         if (++buf_ptr >= buf_end)
 268                             fill_buffer();
 269                     while (*buf_ptr == ' ' || *buf_ptr == '\t');
 270                     break;
 271                 }
 272                 if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
 273                     last_bl = e_com - 1;
 274                 /*
 275                  * if there was a space at the end of the last line, remember
 276                  * where it was
 277                  */
 278                 else {          /* otherwise, insert one */
 279                     last_bl = e_com;
 280                     CHECK_SIZE_COM;
 281                     *e_com++ = ' ';
 282                     ++now_col;
 283                 }
 284             }
 285             ++line_no;          /* keep track of input line number */
 286             if (!ps.box_com) {
 287                 int         nstar = 1;
 288                 do {            /* flush any blanks and/or tabs at start of
 289                                  * next line */
 290                     if (++buf_ptr >= buf_end)
 291                         fill_buffer();
 292                     if (*buf_ptr == '*' && --nstar >= 0) {
 293                         if (++buf_ptr >= buf_end)
 294                             fill_buffer();
 295                         if (*buf_ptr == '/')
 296                             goto end_of_comment;
 297                     }
 298                 } while (*buf_ptr == ' ' || *buf_ptr == '\t');
 299             }
 300             else if (++buf_ptr >= buf_end)
 301                 fill_buffer();
 302             break;              /* end of case for newline */
 303
 304         case '*':               /* must check for possibility of being at end
 305                                  * of comment */
 306             if (++buf_ptr >= buf_end)   /* get to next char after * */
 307                 fill_buffer();
 308
 309             if (unix_comment == 0)      /* set flag to show we are not in
 310                                          * unix-style comment */
 311                 unix_comment = 1;
 312
 313             if (*buf_ptr == '/') {      /* it is the end!!! */
 314         end_of_comment:
 315                 if (++buf_ptr >= buf_end)
 316                     fill_buffer();
 317
 318                 if (*(e_com - 1) != ' ' && !ps.box_com) {       /* insure blank before
 319                                                                  * end */
 320                     *e_com++ = ' ';
 321                     ++now_col;
 322                 }
 323                 if (break_delim == 1 && !one_liner && s_com[0] == '/'
 324                         && s_com[1] == '*' && s_com[2] == ' ') {
 325                     char       *t = e_com;
 326                     break_delim = 2;
 327                     e_com = s_com + 2;
 328                     *e_com = 0;
 329                     if (blanklines_before_blockcomments)
 330                         prefix_blankline_requested = 1;
 331                     dump_line();
 332                     e_com = t;
 333                     s_com[0] = s_com[1] = s_com[2] = ' ';
 334                 }
 335                 if (break_delim == 2 && e_com > s_com + 3
 336                          /* now_col > adj_max_col - 2 && !ps.box_com */ ) {
 337                     *e_com = '\0';
 338                     dump_line();
 339                     now_col = ps.com_col;
 340                 }
 341                 CHECK_SIZE_COM;
 342                 *e_com++ = '*';
 343                 *e_com++ = '/';
 344                 *e_com = '\0';
 345                 ps.just_saw_decl = l_just_saw_decl;
 346                 return;
 347             }
 348             else {              /* handle isolated '*' */
 349                 *e_com++ = '*';
 350                 ++now_col;
 351             }
 352             break;
 353         default:                /* we have a random char */
 354             if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
 355                 unix_comment = 1;       /* we are not in unix-style comment */
 356
 357             *e_com = *buf_ptr++;
 358             if (buf_ptr >= buf_end)
 359                 fill_buffer();
 360
 361             if (*e_com == '\t') /* keep track of column */
 362                 now_col = ((now_col - 1) & tabmask) + tabsize + 1;
 363             else if (*e_com == '\b')    /* this is a backspace */
 364                 --now_col;
 365             else
 366                 ++now_col;
 367
 368             if (*e_com == ' ' || *e_com == '\t')
 369                 last_bl = e_com;
 370             /* remember we saw a blank */
 371
 372             ++e_com;
 373             if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') {
 374                 /*
 375                  * the comment is too long, it must be broken up
 376                  */
 377                 if (break_delim == 1 && s_com[0] == '/'
 378                         && s_com[1] == '*' && s_com[2] == ' ') {
 379                     char       *t = e_com;
 380                     break_delim = 2;
 381                     e_com = s_com + 2;
 382                     *e_com = 0;
 383                     if (blanklines_before_blockcomments)
 384                         prefix_blankline_requested = 1;
 385                     dump_line();
 386                     e_com = t;
 387                     s_com[0] = s_com[1] = s_com[2] = ' ';
 388                 }
 389                 if (last_bl == NULL) {  /* we have seen no blanks */
 390                     last_bl = e_com;    /* fake it */
 391                     *e_com++ = ' ';
 392                 }
 393                 *e_com = '\0';  /* print what we have */
 394                 *last_bl = '\0';
 395                 while (last_bl > s_com && last_bl[-1] < 040)
 396                     *--last_bl = 0;
 397                 e_com = last_bl;
 398                 dump_line();
 399
 400                 *e_com++ = ' '; /* add blanks for continuation */
 401                 *e_com++ = ' ';
 402                 *e_com++ = ' ';
 403
 404                 t_ptr = last_bl + 1;
 405                 last_bl = NULL;
 406                 if (t_ptr >= e_com) {
 407                     while (*t_ptr == ' ' || *t_ptr == '\t')
 408                         t_ptr++;
 409                     while (*t_ptr != '\0') {    /* move unprinted part of
 410                                                  * comment down in buffer */
 411                         if (*t_ptr == ' ' || *t_ptr == '\t')
 412                             last_bl = e_com;
 413                         *e_com++ = *t_ptr++;
 414                     }
 415                 }
 416                 *e_com = '\0';
 417                 now_col = count_spaces(ps.com_col, s_com);      /* recompute current
 418                                                                  * position */
 419             }
 420             break;
 421         }
 422     }
 423 }