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1.1 root 1: /*
2: * Copyright (c) 1980 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: static char sccsid[] = "@(#)pr_comment.c 5.3 (Berkeley) 9/8/85";
9: #endif not lint
10:
11: /*-
12: *
13: * Copyright (C) 1976
14: * by the
15: * Board of Trustees
16: * of the
17: * University of Illinois
18: *
19: * All rights reserved
20: *
21: *
22: * NAME:
23: * pr_comment
24: *
25: * FUNCTION:
26: * This routine takes care of scanning and printing comments.
27: *
28: * ALGORITHM:
29: * 1) Decide where the comment should be aligned, and if lines should
30: * be broken.
31: * 2) If lines should not be broken and filled, just copy up to end of
32: * comment.
33: * 3) If lines should be filled, then scan thru input_buffer copying
34: * characters to com_buf. Remember where the last blank, tab, or
35: * newline was. When line is filled, print up to last blank and
36: * continue copying.
37: *
38: * HISTORY:
39: * November 1976 D A Willcox of CAC Initial coding
40: * 12/6/76 D A Willcox of CAC Modification to handle
41: * UNIX-style comments
42: *
43: */
44:
45: /*
46: * this routine processes comments. It makes an attempt to keep comments
47: * from going over the max line length. If a line is too long, it moves
48: * everything from the last blank to the next comment line. Blanks and
49: * tabs from the beginning of the input line are removed
50: */
51:
52: #include "indent_globs.h";
53:
54:
55: pr_comment()
56: {
57: int now_col; /* column we are in now */
58: int adj_max_col; /* Adjusted max_col for when we decide to
59: * spill comments over the right margin */
60: int col_1_com; /* this comment should not be touched */
61: char *last_bl; /* points to the last blank in the output
62: * buffer */
63: char achar;
64: char *t_ptr; /* used for moving string */
65: int unix_comment; /* tri-state variable used to decide if it
66: * is a unix-style comment. 0 means only
67: * blanks since /*, 1 means regular style
68: * comment, 2 means unix style comment */
69: int break_delim = comment_delimiter_on_blankline;
70: int l_just_saw_decl = ps.just_saw_decl;
71: /*
72: * int ps.last_nl = 0; /* true iff the last significant
73: * thing weve seen is a newline
74: */
75: int one_liner = 1; /* true iff this comment is a one-liner */
76: adj_max_col = max_col;
77: ps.just_saw_decl = 0;
78: last_bl = 0; /* no blanks found so far */
79: ps.box_com = col_1_com = false; /* at first, assume that we are
80: * not in a boxed comment or some
81: * other comment that should not
82: * be touched */
83: ++ps.out_coms; /* keep track of number of comments */
84: unix_comment = 1; /* set flag to let us figure out if there
85: * is a unix-style comment ** DISABLED:
86: * use 0 to reenable this hack! */
87:
88: /* Figure where to align and how to treat the comment */
89:
90: if (ps.col_1 && !format_col1_comments) { /* if comment starts in
91: * column 1 it should not
92: * be touched */
93: col_1_com = ps.box_com = true;
94: ps.com_col = 1;
95: } else {
96: if (*buf_ptr == '-' || *buf_ptr == '*') {
97: ps.box_com = true; /* a comment with a '-' or '*' immediately
98: * after the /* is assumed to be a boxed
99: * comment */
100: col_1_com = true;
101: break_delim = 0;
102: }
103: if ( /* ps.bl_line && */ (s_lab == e_lab) && (s_code == e_code)) {
104: /* klg: check only if this line is blank */
105: /*
106: * If this (*and previous lines are*) blank, dont put comment
107: * way out at left
108: */
109: ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
110: adj_max_col = block_comment_max_col;
111: if (ps.com_col <= 1)
112: ps.com_col = 1 + !format_col1_comments;
113: } else {
114: register target_col;
115: break_delim = 0;
116: if (s_code != e_code)
117: target_col = count_spaces(compute_code_target(), s_code);
118: else {
119: target_col = 1;
120: if (s_lab != e_lab)
121: target_col = count_spaces(compute_label_target(), s_lab);
122: }
123: ps.com_col = ps.decl_on_line || ps.ind_level == 0 ? ps.decl_com_ind : ps.com_ind;
124: if (ps.com_col < target_col)
125: ps.com_col = ((target_col + 7) & ~7) + 1;
126: if (ps.com_col + 24 > adj_max_col)
127: adj_max_col = ps.com_col + 24;
128: }
129: }
130: if (ps.box_com) {
131: buf_ptr[-2] = 0;
132: ps.n_comment_delta = 1 - count_spaces(1, in_buffer);
133: ps.comment_delta = 0;
134: buf_ptr[-2] = '/';
135: } else {
136: ps.n_comment_delta = 0;
137: ps.comment_delta = 0;
138: while (*buf_ptr == ' ' || *buf_ptr == '\t')
139: buf_ptr++;
140: }
141: ps.comment_delta = 0;
142: *e_com++ = '/'; /* put '/*' into buffer */
143: *e_com++ = '*';
144: if (*buf_ptr != ' ' && !ps.box_com)
145: *e_com++ = ' ';
146:
147: *e_com = '\0';
148: now_col = count_spaces(ps.com_col, s_com); /* figure what column we
149: * would be in if we
150: * printed the comment now */
151:
152: /* Start to copy the comment */
153:
154: while (1) { /* this loop will go until the comment is
155: * copied */
156: if (*buf_ptr > 040 && *buf_ptr != '*')
157: ps.last_nl = 0;
158: switch (*buf_ptr) { /* this checks for various spcl cases */
159: case 014: /* check for a form feed */
160: if (!ps.box_com) { /* in a text comment, break the
161: * line here */
162: ps.use_ff = true;
163: /* fix so dump_line uses a form feed */
164: dump_line();
165: last_bl = 0;
166: *e_com++ = ' ';
167: *e_com++ = '*';
168: *e_com++ = ' ';
169: while (*++buf_ptr == ' ' || *buf_ptr == '\t');
170: } else {
171: if (++buf_ptr >= buf_end)
172: fill_buffer();
173: *e_com++ = 014;
174: }
175: break;
176:
177: case '\n':
178: if (had_eof) { /* check for unexpected eof */
179: printf("Unterminated comment\n");
180: *e_com = '\0';
181: dump_line();
182: return;
183: }
184: one_liner = 0;
185: if (ps.box_com || ps.last_nl) { /* if this is a boxed
186: * comment, we dont ignore
187: * the newline */
188: if (s_com == e_com) {
189: *e_com++ = ' ';
190: *e_com++ = ' ';
191: }
192: *e_com = '\0';
193: if (!ps.box_com && e_com - s_com > 3) {
194: if (break_delim == 1 && s_com[0] == '/'
195: && s_com[1] == '*' && s_com[2] == ' ') {
196: char *t = e_com;
197: break_delim = 2;
198: e_com = s_com + 2;
199: *e_com = 0;
200: if (blanklines_before_blockcomments) prefix_blankline_requested = 1;
201: dump_line();
202: e_com = t;
203: s_com[0] = s_com[1] = s_com[2] = ' ';
204: }
205: dump_line();
206: *e_com++ = ' ';
207: *e_com++ = ' ';
208: }
209: dump_line();
210: now_col = ps.com_col;
211: } else {
212: ps.last_nl = 1;
213: if (unix_comment != 1) { /* we not are in
214: * unix_style comment */
215: if (unix_comment == 0 && s_code == e_code) {
216: /*
217: * if it is a UNIX-style comment, ignore the
218: * requirement that previous line be blank for
219: * unindention
220: */
221: ps.com_col = (ps.ind_level - ps.unindent_displace) * ps.ind_size + 1;
222: if (ps.com_col <= 1)
223: ps.com_col = 2;
224: }
225: unix_comment = 2; /* permanently remember that we
226: * are in this type of comment */
227: dump_line();
228: ++line_no;
229: now_col = ps.com_col;
230: *e_com++ = ' ';
231: /*
232: * fix so that the star at the start of the line will
233: * line up
234: */
235: do /* flush leading white space */
236: if (++buf_ptr >= buf_end)
237: fill_buffer();
238: while (*buf_ptr == ' ' || *buf_ptr == '\t');
239: break;
240: }
241: if (*(e_com - 1) == ' ' || *(e_com - 1) == '\t')
242: last_bl = e_com - 1;
243: /*
244: * if there was a space at the end of the last line,
245: * remember where it was
246: */
247: else { /* otherwise, insert one */
248: last_bl = e_com;
249: *e_com++ = ' ';
250: ++now_col;
251: }
252: }
253: ++line_no; /* keep track of input line number */
254: if (!ps.box_com) {
255: int nstar = 1;
256: do { /* flush any blanks and/or tabs at start
257: * of next line */
258: if (++buf_ptr >= buf_end)
259: fill_buffer();
260: if (*buf_ptr == '*' && --nstar >= 0) {
261: if (++buf_ptr >= buf_end)
262: fill_buffer();
263: if (*buf_ptr == '/')
264: goto end_of_comment;
265: }
266: } while (*buf_ptr == ' ' || *buf_ptr == '\t');
267: } else if (++buf_ptr >= buf_end) fill_buffer();
268: break; /* end of case for newline */
269:
270: case '*': /* must check for possibility of being at
271: * end of comment */
272: if (++buf_ptr >= buf_end) /* get to next char after * */
273: fill_buffer();
274:
275: if (unix_comment == 0) /* set flag to show we are not in
276: * unix-style comment */
277: unix_comment = 1;
278:
279: if (*buf_ptr == '/') { /* it is the end!!! */
280: end_of_comment:
281: if (++buf_ptr >= buf_end)
282: fill_buffer();
283:
284: if (*(e_com - 1) != ' ' && !ps.box_com) { /* insure blank before
285: * end */
286: *e_com++ = ' ';
287: ++now_col;
288: }
289: if (break_delim == 1 && !one_liner && s_com[0] == '/'
290: && s_com[1] == '*' && s_com[2] == ' ') {
291: char *t = e_com;
292: break_delim = 2;
293: e_com = s_com + 2;
294: *e_com = 0;
295: if (blanklines_before_blockcomments) prefix_blankline_requested = 1;
296: dump_line();
297: e_com = t;
298: s_com[0] = s_com[1] = s_com[2] = ' ';
299: }
300: if (break_delim == 2 && e_com > s_com + 3
301: /* now_col > adj_max_col - 2 && !ps.box_com */ ) {
302: *e_com = '\0';
303: dump_line();
304: now_col = ps.com_col;
305: }
306: *e_com++ = '*';
307: *e_com++ = '/';
308: *e_com = '\0';
309: ps.just_saw_decl = l_just_saw_decl;
310: return;
311: } else { /* handle isolated '*' */
312: *e_com++ = '*';
313: ++now_col;
314: }
315: break;
316: default: /* we have a random char */
317: if (unix_comment == 0 && *buf_ptr != ' ' && *buf_ptr != '\t')
318: unix_comment = 1; /* we are not in unix-style
319: * comment */
320:
321: *e_com = *buf_ptr++;
322: if (buf_ptr >= buf_end)
323: fill_buffer();
324:
325: if (*e_com == '\t') /* keep track of column */
326: now_col = ((now_col - 1) & tabmask) + tabsize + 1;
327: else if (*e_com == '\b') /* this is a backspace */
328: --now_col;
329: else
330: ++now_col;
331:
332: if (*e_com == ' ' || *e_com == '\t')
333: last_bl = e_com;
334: /* remember we saw a blank */
335:
336: ++e_com;
337: if (now_col > adj_max_col && !ps.box_com && unix_comment == 1 && e_com[-1] > ' ') {
338: /* the comment is too long, it must be broken up */
339: if (break_delim == 1 && s_com[0] == '/'
340: && s_com[1] == '*' && s_com[2] == ' ') {
341: char *t = e_com;
342: break_delim = 2;
343: e_com = s_com + 2;
344: *e_com = 0;
345: if (blanklines_before_blockcomments) prefix_blankline_requested = 1;
346: dump_line();
347: e_com = t;
348: s_com[0] = s_com[1] = s_com[2] = ' ';
349: }
350: if (last_bl == 0) { /* we have seen no blanks */
351: last_bl = e_com; /* fake it */
352: *e_com++ = ' ';
353: }
354: *e_com = '\0'; /* print what we have */
355: *last_bl = '\0';
356: while (last_bl > s_com && last_bl[-1] < 040)
357: *--last_bl = 0;
358: e_com = last_bl;
359: dump_line();
360:
361: *e_com++ = ' '; /* add blanks for continuation */
362: *e_com++ = ' ';
363: *e_com++ = ' ';
364:
365: t_ptr = last_bl + 1;
366: last_bl = 0;
367: if (t_ptr >= e_com) {
368: while (*t_ptr == ' ' || *t_ptr == '\t')
369: t_ptr++;
370: while (*t_ptr != '\0') { /* move unprinted part
371: * of comment down in
372: * buffer */
373: if (*t_ptr == ' ' || *t_ptr == '\t')
374: last_bl = e_com;
375: *e_com++ = *t_ptr++;
376: }
377: }
378: *e_com = '\0';
379: now_col = count_spaces(ps.com_col, s_com); /* recompute current
380: * position */
381: }
382: break;
383: }
384: }
385: }
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