/* Locations for Bison
- Copyright (C) 2002, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2005-2013 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
- Bison is free software; you can redistribute it and/or modify
+ This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
- Bison is distributed in the hope that it will be useful,
+ This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with Bison; see the file COPYING. If not, write to
- the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
+#include <mbswidth.h>
#include <quotearg.h>
+#include "complain.h"
#include "location.h"
-location const empty_location;
+location const empty_location = EMPTY_LOCATION_INIT;
+
+/* If BUF is null, add BUFSIZE (which in this case must be less than
+ INT_MAX) to COLUMN; otherwise, add mbsnwidth (BUF, BUFSIZE, 0) to
+ COLUMN. If an overflow occurs, or might occur but is undetectable,
+ return INT_MAX. Assume COLUMN is nonnegative. */
+
+static inline int
+add_column_width (int column, char const *buf, size_t bufsize)
+{
+ size_t width;
+ unsigned int remaining_columns = INT_MAX - column;
+
+ if (buf)
+ {
+ if (INT_MAX / 2 <= bufsize)
+ return INT_MAX;
+ width = mbsnwidth (buf, bufsize, 0);
+ }
+ else
+ width = bufsize;
+
+ return width <= remaining_columns ? column + width : INT_MAX;
+}
+
+/* Set *LOC and adjust scanner cursor to account for token TOKEN of
+ size SIZE. */
+
+void
+location_compute (location *loc, boundary *cur, char const *token, size_t size)
+{
+ int line = cur->line;
+ int column = cur->column;
+ char const *p0 = token;
+ char const *p = token;
+ char const *lim = token + size;
+
+ loc->start = *cur;
+
+ for (p = token; p < lim; p++)
+ switch (*p)
+ {
+ case '\n':
+ line += line < INT_MAX;
+ column = 1;
+ p0 = p + 1;
+ break;
+
+ case '\t':
+ column = add_column_width (column, p0, p - p0);
+ column = add_column_width (column, NULL, 8 - ((column - 1) & 7));
+ p0 = p + 1;
+ break;
+
+ default:
+ break;
+ }
+
+ cur->line = line;
+ cur->column = column = add_column_width (column, p0, p - p0);
+
+ loc->end = *cur;
+
+ if (line == INT_MAX && loc->start.line != INT_MAX)
+ complain (loc, Wother, _("line number overflow"));
+ if (column == INT_MAX && loc->start.column != INT_MAX)
+ complain (loc, Wother, _("column number overflow"));
+}
+
/* Output to OUT the location LOC.
Warning: it uses quotearg's slot 3. */
-void
+unsigned
location_print (FILE *out, location loc)
{
- fprintf (out, "%s:%d.%d",
- quotearg_n_style (3, escape_quoting_style, loc.start.file),
- loc.start.line, loc.start.column);
-
+ unsigned res = 0;
+ int end_col = 0 != loc.end.column ? loc.end.column - 1 : 0;
+ res += fprintf (out, "%s",
+ quotearg_n_style (3, escape_quoting_style, loc.start.file));
+ if (0 <= loc.start.line)
+ {
+ res += fprintf (out, ":%d", loc.start.line);
+ if (0 <= loc.start.column)
+ res += fprintf (out, ".%d", loc.start.column);
+ }
if (loc.start.file != loc.end.file)
- fprintf (out, "-%s:%d.%d",
- quotearg_n_style (3, escape_quoting_style, loc.end.file),
- loc.end.line, loc.end.column - 1);
- else if (loc.start.line < loc.end.line)
- fprintf (out, "-%d.%d", loc.end.line, loc.end.column - 1);
- else if (loc.start.column < loc.end.column - 1)
- fprintf (out, "-%d", loc.end.column - 1);
+ {
+ res += fprintf (out, "-%s",
+ quotearg_n_style (3, escape_quoting_style,
+ loc.end.file));
+ if (0 <= loc.end.line)
+ {
+ res += fprintf (out, ":%d", loc.end.line);
+ if (0 <= end_col)
+ res += fprintf (out, ".%d", end_col);
+ }
+ }
+ else if (0 <= loc.end.line)
+ {
+ if (loc.start.line < loc.end.line)
+ {
+ res += fprintf (out, "-%d", loc.end.line);
+ if (0 <= end_col)
+ res += fprintf (out, ".%d", end_col);
+ }
+ else if (0 <= end_col && loc.start.column < end_col)
+ res += fprintf (out, "-%d", end_col);
+ }
+
+ return res;
+}
+
+
+/* Persistant data used by location_caret to avoid reopening and rereading the
+ same file all over for each error. */
+struct caret_info
+{
+ FILE *source;
+ size_t line;
+ size_t offset;
+};
+
+static struct caret_info caret_info = { NULL, 1, 0 };
+
+void
+cleanup_caret ()
+{
+ if (caret_info.source)
+ fclose (caret_info.source);
+ caret_info.source = NULL;
+ caret_info.line = 1;
+ caret_info.offset = 0;
+}
+
+void
+location_caret (FILE *out, location loc)
+{
+ /* FIXME: find a way to support multifile locations, and only open once each
+ file. That would make the procedure future-proof. */
+ if (! (caret_info.source
+ || (caret_info.source = fopen (loc.start.file, "r")))
+ || loc.start.column == -1 || loc.start.line == -1)
+ return;
+
+ /* If the line we want to quote is seekable (the same line as the previous
+ location), just seek it. If it was a previous line, we lost track of it,
+ so return to the start of file. */
+ if (caret_info.line <= loc.start.line)
+ fseek (caret_info.source, caret_info.offset, SEEK_SET);
+ else
+ {
+ caret_info.line = 1;
+ caret_info.offset = 0;
+ fseek (caret_info.source, caret_info.offset, SEEK_SET);
+ }
+
+ /* Advance to the line's position, keeping track of the offset. */
+ while (caret_info.line < loc.start.line)
+ caret_info.line += getc (caret_info.source) == '\n';
+ caret_info.offset = ftell (caret_info.source);
+
+ /* Read the actual line. Don't update the offset, so that we keep a pointer
+ to the start of the line. */
+ {
+ char c = getc (caret_info.source);
+ if (c != EOF)
+ {
+ /* Quote the file, indent by a single column. */
+ putc (' ', out);
+ do
+ putc (c, out);
+ while ((c = getc (caret_info.source)) != EOF && c != '\n');
+ putc ('\n', out);
+
+ {
+ /* The caret of a multiline location ends with the first line. */
+ size_t len = loc.start.line != loc.end.line
+ ? ftell (caret_info.source) - caret_info.offset
+ : loc.end.column;
+ int i;
+
+ /* Print the carets (at least one), with the same indent as above.*/
+ fprintf (out, " %*s", loc.start.column - 1, "");
+ for (i = loc.start.column; i == loc.start.column || i < len; ++i)
+ putc ('^', out);
+ }
+ putc ('\n', out);
+ }
+ }
+}
+
+void
+boundary_set_from_string (boundary *bound, char *loc_str)
+{
+ /* Must search in reverse since the file name field may
+ * contain `.' or `:'. */
+ char *delim = strrchr (loc_str, '.');
+ aver (delim);
+ *delim = '\0';
+ bound->column = atoi (delim+1);
+ delim = strrchr (loc_str, ':');
+ aver (delim);
+ *delim = '\0';
+ bound->line = atoi (delim+1);
+ bound->file = uniqstr_new (loc_str);
}
projects / bison.git / blobdiff