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/* Support for fixing grammar files.
Copyright (C) 2019-2021 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
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 3 of the License, or
(at your option) any later version.
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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include "fixits.h"
#include <error.h>
#include <get-errno.h>
#include <gl_array_list.h>
#include <gl_xlist.h>
#include <progname.h>
#include <quote.h>
#include <quotearg.h>
#include <vasnprintf.h>
#include "system.h"
#include "files.h"
#include "getargs.h"
typedef struct
{
location location;
char *fix;
} fixit;
gl_list_t fixits = NULL;
static fixit *
fixit_new (location const *loc, char const* fix)
{
fixit *res = xmalloc (sizeof *res);
res->location = *loc;
res->fix = xstrdup (fix);
return res;
}
static int
fixit_cmp (const fixit *a, const fixit *b)
{
return location_cmp (a->location, b->location);
}
static void
fixit_free (fixit *f)
{
free (f->fix);
free (f);
}
/* GCC and Clang follow the same pattern.
https://gcc.gnu.org/onlinedocs/gcc/Diagnostic-Message-Formatting-Options.html
https://clang.llvm.org/docs/UsersManual.html#cmdoption-fdiagnostics-parseable-fixits */
static void
fixit_print (fixit const *f, FILE *out)
{
fprintf (out, "fix-it:%s:{%d:%d-%d:%d}:%s\n",
quotearg_n_style (1, c_quoting_style, f->location.start.file),
f->location.start.line, f->location.start.byte,
f->location.end.line, f->location.end.byte,
quotearg_n_style (2, c_quoting_style, f->fix));
}
void
fixits_register (location const *loc, char const* fix)
{
if (!fixits)
fixits = gl_list_create_empty (GL_ARRAY_LIST,
/* equals */ NULL,
/* hashcode */ NULL,
(gl_listelement_dispose_fn) fixit_free,
true);
fixit *f = fixit_new (loc, fix);
gl_sortedlist_add (fixits, (gl_listelement_compar_fn) fixit_cmp, f);
if (feature_flag & feature_fixit)
fixit_print (f, stderr);
}
bool
fixits_empty (void)
{
return !fixits;
}
void
fixits_run (void)
{
if (!fixits)
return;
/* This is not unlike what is done in location_caret. */
uniqstr input = ((fixit *) gl_list_get_at (fixits, 0))->location.start.file;
/* Backup the file. */
char buf[256];
size_t len = sizeof (buf);
char *backup = asnprintf (buf, &len, "%s~", input);
if (!backup)
xalloc_die ();
if (rename (input, backup))
error (EXIT_FAILURE, get_errno (),
_("%s: cannot backup"), quotearg_colon (input));
FILE *in = xfopen (backup, "r");
FILE *out = xfopen (input, "w");
size_t line = 1;
size_t offset = 1;
void const *p = NULL;
gl_list_iterator_t iter = gl_list_iterator (fixits);
while (gl_list_iterator_next (&iter, &p, NULL))
{
fixit const *f = p;
/* Look for the correct line. */
while (line < f->location.start.line)
{
int c = getc (in);
if (c == EOF)
break;
if (c == '\n')
{
++line;
offset = 1;
}
putc (c, out);
}
/* Look for the right offset. */
bool need_eol = false;
while (offset < f->location.start.byte)
{
int c = getc (in);
if (c == EOF)
break;
++offset;
if (c == '\n')
/* The position we are asked for is beyond the actual
line: pad with spaces, and remember we need a \n. */
need_eol = true;
putc (need_eol ? ' ' : c, out);
}
/* Paste the fix instead. */
fputs (f->fix, out);
/* Maybe install the eol afterwards. */
if (need_eol)
putc ('\n', out);
/* Skip the bad input. */
while (line < f->location.end.line)
{
int c = getc (in);
if (c == EOF)
break;
if (c == '\n')
{
++line;
offset = 1;
}
}
while (offset < f->location.end.byte)
{
int c = getc (in);
if (c == EOF)
break;
++offset;
}
/* If erasing the content of a full line, also remove the
end-of-line. */
if (f->fix[0] == 0 && f->location.start.byte == 1)
{
int c = getc (in);
if (c == EOF)
break;
else if (c == '\n')
{
++line;
offset = 1;
}
else
ungetc (c, in);
}
}
/* Paste the rest of the file. */
{
int c;
while ((c = getc (in)) != EOF)
putc (c, out);
}
gl_list_iterator_free (&iter);
xfclose (out);
xfclose (in);
fprintf (stderr, "%s: file %s was updated (backup: %s)\n",
program_name, quote_n (0, input), quote_n (1, backup));
if (backup != buf)
free (backup);
}
/* Free the registered fixits. */
void fixits_free (void)
{
if (fixits)
{
gl_list_free (fixits);
fixits = NULL;
}
}
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