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/* Locations for Bison
Copyright (C) 2002, 2004-2015, 2018-2021 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/>. */
#ifndef LOCATION_H_
# define LOCATION_H_
# include <stdbool.h>
# include <stdio.h>
# include <string.h> /* strcmp */
# include "uniqstr.h"
/* A boundary between two characters. */
typedef struct
{
/* The name of the file that contains the boundary. */
uniqstr file;
/* If positive, the line (starting at 1) that contains the boundary.
If this is INT_MAX, the line number has overflowed.
Meaningless and not displayed if nonpositive.
*/
int line;
/* If positive, the column (starting at 1) just after the boundary.
This is neither a byte count, nor a character count; it is a
(visual) column count. If this is INT_MAX, the column number has
overflowed.
Meaningless and not displayed if nonpositive. */
int column;
/* If nonnegative, the byte number (starting at 0) in the current
line. Not displayed (unless --trace=location). */
int byte;
} boundary;
/* Set the position of \a p. */
static inline void
boundary_set (boundary *p, const char *f, int l, int c, int b)
{
p->file = f;
p->line = l;
p->column = c;
p->byte = b;
}
/* Return -1, 0, 1, depending whether a is before, equal, or
after b. */
static inline int
boundary_cmp (boundary a, boundary b)
{
/* Locations with no file first. */
int res =
a.file && b.file ? strcmp (a.file, b.file)
: a.file ? 1
: b.file ? -1
: 0;
if (!res)
res = a.line - b.line;
if (!res)
res = a.column - b.column;
return res;
}
/* Return nonzero if A and B are equal boundaries. */
static inline bool
equal_boundaries (boundary a, boundary b)
{
return (a.column == b.column
&& a.line == b.line
&& UNIQSTR_EQ (a.file, b.file));
}
/* A location, that is, a region of source code. */
typedef struct
{
/* Boundary just before the location starts. */
boundary start;
/* Boundary just after the location ends. */
boundary end;
} location;
# define GRAM_LTYPE location
# define EMPTY_LOCATION_INIT {{NULL, 0, 0, 0}, {NULL, 0, 0, 0}}
extern location const empty_loc;
/* 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);
/* Print location to file.
Return number of actually printed characters.
Warning: uses quotearg's slot 3. */
int location_print (location loc, FILE *out);
/* Prepare the use of location_caret. */
void caret_init (void);
/* Free any allocated resources and close any open file handles that are
left-over by the usage of location_caret. */
void caret_free (void);
/* If -fcaret is enabled, quote the line containing LOC onto OUT.
Highlight the part of LOC with the color STYLE. */
void location_caret (location loc, const char* style, FILE *out);
/* If -fcaret is enabled, display a suggestion of replacement for LOC
with S. To call after location_caret. */
void location_caret_suggestion (location loc, const char *s, FILE *out);
/* Return -1, 0, 1, depending whether a is before, equal, or
after b. */
static inline int
location_cmp (location a, location b)
{
int res = boundary_cmp (a.start, b.start);
if (!res)
res = boundary_cmp (a.end, b.end);
return res;
}
/* Whether this is the empty location. */
bool location_empty (location loc);
/* STR must be formatted as 'file:line.column@byte' or 'file:line.column',
it will be modified. */
void boundary_set_from_string (boundary *bound, char *str);
#endif /* ! defined LOCATION_H_ */
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