src/location.h

   1 /* Locations for Bison
   2
   3    Copyright (C) 2002, 2004-2012 Free Software Foundation, Inc.
   4
   5    This file is part of Bison, the GNU Compiler Compiler.
   6
   7    This program is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef LOCATION_H_
  21 # define LOCATION_H_
  22
  23 # include "uniqstr.h"
  24
  25 /* A boundary between two characters.  */
  26 typedef struct
  27 {
  28   /* The name of the file that contains the boundary.  */
  29   uniqstr file;
  30
  31   /* If nonnegative, the (origin-1) line that contains the boundary.
  32      If this is INT_MAX, the line number has overflowed.
  33
  34      Meaningless and not displayed if negative.
  35   */
  36   int line;
  37
  38   /* If nonnegative, the (origin-1) column just after the boundary.
  39      This is neither a byte count, nor a character count; it is a
  40      column count.  If this is INT_MAX, the column number has
  41      overflowed.
  42
  43      Meaningless and not displayed if negative.
  44   */
  45   int column;
  46
  47 } boundary;
  48
  49 /* Set the position of \a a. */
  50 static inline void
  51 boundary_set (boundary *b, const char *f, int l, int c)
  52 {
  53   b->file = f;
  54   b->line = l;
  55   b->column = c;
  56 }
  57
  58 /* Return -1, 0, 1, depending whether a is before, equal, or
  59    after b.  */
  60 static inline int
  61 boundary_cmp (boundary a, boundary b)
  62 {
  63   int res = strcmp (a.file, b.file);
  64   if (!res)
  65     res = a.line - b.line;
  66   if (!res)
  67     res = a.column - b.column;
  68   return res;
  69 }
  70
  71 /* Return nonzero if A and B are equal boundaries.  */
  72 static inline bool
  73 equal_boundaries (boundary a, boundary b)
  74 {
  75   return (a.column == b.column
  76           && a.line == b.line
  77           && UNIQSTR_EQ (a.file, b.file));
  78 }
  79
  80 /* A location, that is, a region of source code.  */
  81 typedef struct
  82 {
  83   /* Boundary just before the location starts.  */
  84   boundary start;
  85
  86   /* Boundary just after the location ends.  */
  87   boundary end;
  88
  89 } location;
  90
  91 #define GRAM_LTYPE location
  92
  93 #define EMPTY_LOCATION_INIT {{NULL, 0, 0}, {NULL, 0, 0}}
  94 extern location const empty_location;
  95
  96 /* Set *LOC and adjust scanner cursor to account for token TOKEN of
  97    size SIZE.  */
  98 void location_compute (location *loc,
  99                        boundary *cur, char const *token, size_t size);
 100
 101 /* Print location to file. Return number of actually printed
 102    characters.  */
 103 unsigned location_print (FILE *out, location loc);
 104
 105 /* Return -1, 0, 1, depending whether a is before, equal, or
 106    after b.  */
 107 static inline int
 108 location_cmp (location a, location b)
 109 {
 110   int res = boundary_cmp (a.start, b.start);
 111   if (!res)
 112     res = boundary_cmp (a.end, b.end);
 113   return res;
 114 }
 115
 116 /* LOC_STR must be formatted as `file:line.column', it will be modified.  */
 117 void boundary_set_from_string (boundary *bound, char *loc_str);
 118
 119 #endif /* ! defined LOCATION_H_ */