home *** CD-ROM | disk | FTP | other *** search
- /* Copyright (c) 1992, Free Software Foundation, Inc. All rights reserved.
-
- Copyright (c) 1985 Sun Microsystems, Inc. Copyright (c) 1980 The Regents
- of the University of California. Copyright (c) 1976 Board of Trustees of
- the University of Illinois. All rights reserved.
-
- Redistribution and use in source and binary forms are permitted
- provided that
- the above copyright notice and this paragraph are duplicated in all such
- forms and that any documentation, advertising materials, and other
- materials related to such distribution and use acknowledge that the
- software was developed by the University of California, Berkeley, the
- University of Illinois, Urbana, and Sun Microsystems, Inc. The name of
- either University or Sun Microsystems may not be used to endorse or
- promote products derived from this software without specific prior written
- permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES
- OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */
-
-
- /* 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
- 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 */
-
-
- #include "sys.h"
- #include "indent.h"
-
- /* Declared and documented in indent.h. */
- int out_coms;
-
- pr_comment ()
- {
- 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 = parser_state_tos->just_saw_decl;
- /* int parser_state_tos->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;
- parser_state_tos->just_saw_decl = 0;
- last_bl = 0; /* no blanks found so far */
- parser_state_tos->box_com = false; /* at first, assume that we are not
- in a boxed comment or some other
- comment that should not be touched */
- ++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 (parser_state_tos->col_1 && !format_col1_comments)
- { /* if comment starts in column 1 it should
- not be touched */
- parser_state_tos->box_com = true;
- parser_state_tos->com_col = 1;
- }
- else
- {
- if (*buf_ptr == '-' || *buf_ptr == '*' || !format_comments)
- {
- parser_state_tos->box_com = true; /* a comment with a '-' or
- '*' immediately after the
- /* is assumed to be a
- boxed comment */
- break_delim = 0;
- }
-
-
- /* Used to also check that parser_state_tos->bl_line != 0 */
- if ((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 */
- parser_state_tos->com_col
- = (parser_state_tos->ind_level - unindent_displace) + 1;
- adj_max_col = block_comment_max_col;
- if (parser_state_tos->com_col <= 1)
- parser_state_tos->com_col = 1 + !format_col1_comments;
-
- /* If we have a comment in an old-style (pre-ANSI) parameter
- declaration, indent it like we would the parameter declaration.
- For example:
- int destroy (what) / * N things to destroy. * / int what;
- */
- if (parser_state_tos->in_parameter_declaration
- && indent_parameters != 0
- && parser_state_tos->dec_nest == 0)
- {
- parser_state_tos->com_col = indent_parameters + 1;
- parser_state_tos->ind_stmt = 0;
- }
- }
- else
- {
- register 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);
- }
- parser_state_tos->com_col = parser_state_tos->decl_on_line
- || parser_state_tos->ind_level == 0 ? decl_com_ind : com_ind;
- /* If we are already past the position for the comment, put it at
- the next tab stop. */
- if (parser_state_tos->com_col < target_col)
- parser_state_tos->com_col = ((target_col + (tabsize - 1))
- & ~(tabsize - 1)) + 1;
- if (else_or_endif)
- {
- parser_state_tos->com_col = else_endif_col;
- else_or_endif = false;
- /* We want the comment to appear one space after the #else or
- #endif. */
- if (parser_state_tos->com_col < target_col)
- parser_state_tos->com_col = target_col + 1;
- }
- if (parser_state_tos->com_col + 24 > adj_max_col)
- adj_max_col = parser_state_tos->com_col + 24;
- }
- }
- if (parser_state_tos->box_com)
- {
- parser_state_tos->n_comment_delta = 1 - parser_state_tos->com_col;
- #if 0
- buf_ptr[-2] = 0;
- parser_state_tos->n_comment_delta = 1 - count_spaces (1, cur_line);
- buf_ptr[-2] = '/';
- #endif
- }
- else
- {
- parser_state_tos->n_comment_delta = 0;
- while (*buf_ptr == ' ' || *buf_ptr == '\t')
- buf_ptr++;
- }
- parser_state_tos->comment_delta = 0;
- *e_com++ = '/'; /* put '/*' into buffer */
- *e_com++ = '*';
- if (*buf_ptr != ' ' && !parser_state_tos->box_com)
- *e_com++ = ' ';
-
- *e_com = '\0';
- if (troff)
- {
- now_col = 1;
- adj_max_col = 80;
- }
- else
- /* figure what column we would be in if we printed the comment now */
- now_col = count_spaces (parser_state_tos->com_col, s_com);
-
- /* Start to copy the comment */
-
- while (1)
- { /* this loop will go until the comment is
- copied */
- if (*buf_ptr > 040 && *buf_ptr != '*')
- parser_state_tos->last_nl = 0;
- check_com_size;
- switch (*buf_ptr)
- { /* this checks for various spcl cases */
- case 014: /* check for a form feed */
- if (!parser_state_tos->box_com)
- { /* in a text comment, break the line here */
- parser_state_tos->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 (parser_state_tos->box_com || parser_state_tos->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 (!parser_state_tos->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_com_size;
- *e_com++ = ' ';
- *e_com++ = ' ';
- }
- dump_line ();
- now_col = parser_state_tos->com_col;
- }
- else
- {
- parser_state_tos->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 */
- parser_state_tos->com_col
- = ((parser_state_tos->ind_level - unindent_displace)
- + ind_size);
- if (parser_state_tos->com_col <= 1)
- parser_state_tos->com_col = 2;
- }
- unix_comment = 2; /* permanently remember that we are
- in this type of comment */
- dump_line ();
- ++line_no;
- now_col = parser_state_tos->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_com_size;
- *e_com++ = ' ';
- ++now_col;
- }
- }
- ++line_no; /* keep track of input line number */
- if (!parser_state_tos->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) != ' ' && !parser_state_tos->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 && !parser_state_tos->box_com */ )
- {
- *e_com = '\0';
- dump_line ();
- now_col = parser_state_tos->com_col;
- }
- check_com_size;
- *e_com++ = '*';
- *e_com++ = '/';
- *e_com = '\0';
- parser_state_tos->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 + tabsize - (now_col - 1) % tabsize;
- 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
- && !parser_state_tos->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';
- /* recompute current position */
- now_col = count_spaces (parser_state_tos->com_col, s_com);
- }
- break;
- }
- }
- }
-