src/location.h

   1 /* Locations for Bison
   2
   3    Copyright (C) 2002, 2004-2014 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 <stdbool.h>
  24 # include <stdio.h>
  25 # include <string.h> /* strcmp */
  26
  27 # include "uniqstr.h"
  28
  29 /* A boundary between two characters.  */
  30 typedef struct
  31 {
  32   /* The name of the file that contains the boundary.  */
  33   uniqstr file;
  34
  35   /* If nonnegative, the (origin-1) line that contains the boundary.
  36      If this is INT_MAX, the line number has overflowed.
  37
  38      Meaningless and not displayed if negative.
  39   */
  40   int line;
  41
  42   /* If nonnegative, the (origin-1) column just after the boundary.
  43      This is neither a byte count, nor a character count; it is a
  44      column count.  If this is INT_MAX, the column number has
  45      overflowed.
  46
  47      Meaningless and not displayed if negative.
  48   */
  49   int column;
  50
  51 } boundary;
  52
  53 /* Set the position of \a a. */
  54 static inline void
  55 boundary_set (boundary *b, const char *f, int l, int c)
  56 {
  57   b->file = f;
  58   b->line = l;
  59   b->column = c;
  60 }
  61
  62 /* Return -1, 0, 1, depending whether a is before, equal, or
  63    after b.  */
  64 static inline int
  65 boundary_cmp (boundary a, boundary b)
  66 {
  67   int res = strcmp (a.file, b.file);
  68   if (!res)
  69     res = a.line - b.line;
  70   if (!res)
  71     res = a.column - b.column;
  72   return res;
  73 }
  74
  75 /* Return nonzero if A and B are equal boundaries.  */
  76 static inline bool
  77 equal_boundaries (boundary a, boundary b)
  78 {
  79   return (a.column == b.column
  80           && a.line == b.line
  81           && UNIQSTR_EQ (a.file, b.file));
  82 }
  83
  84 /* A location, that is, a region of source code.  */
  85 typedef struct
  86 {
  87   /* Boundary just before the location starts.  */
  88   boundary start;
  89
  90   /* Boundary just after the location ends.  */
  91   boundary end;
  92
  93 } location;
  94
  95 # define GRAM_LTYPE location
  96
  97 # define EMPTY_LOCATION_INIT {{NULL, 0, 0}, {NULL, 0, 0}}
  98 extern location const empty_location;
  99
 100 /* Set *LOC and adjust scanner cursor to account for token TOKEN of
 101    size SIZE.  */
 102 void location_compute (location *loc,
 103                        boundary *cur, char const *token, size_t size);
 104
 105 /* Print location to file.
 106    Return number of actually printed characters.
 107    Warning: uses quotearg's slot 3. */
 108 unsigned location_print (location loc, FILE *out);
 109
 110 /* Free any allocated ressources and close any open file handles that are
 111    left-over by the usage of location_caret.  */
 112 void cleanup_caret (void);
 113
 114 /* Output to OUT the line and caret corresponding to location LOC.  */
 115 void location_caret (location loc, FILE *out);
 116
 117 /* Return -1, 0, 1, depending whether a is before, equal, or
 118    after b.  */
 119 static inline int
 120 location_cmp (location a, location b)
 121 {
 122   int res = boundary_cmp (a.start, b.start);
 123   if (!res)
 124     res = boundary_cmp (a.end, b.end);
 125   return res;
 126 }
 127
 128 /* LOC_STR must be formatted as 'file:line.column', it will be modified.  */
 129 void boundary_set_from_string (boundary *bound, char *loc_str);
 130
 131 #endif /* ! defined LOCATION_H_ */