43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
// Copyright © 2006, Ondra Kamenik
|
|
|
|
// $Id: location.h 762 2006-05-22 13:00:07Z kamenik $
|
|
|
|
// Purpose: This file defines macros for lex and bison so that the
|
|
// very primitive location tracking would be enabled. The location of
|
|
// a token is given by offset of its first character. The offset is
|
|
// relative to the number which is (and must be) initialized before
|
|
// parsing. This file is to be included to the top of bison and lex
|
|
// sources.
|
|
|
|
// How to use: in preamble of bison and flex, you must include this
|
|
// file and declare extern YYLTYPE prefix##lloc. In addition, in flex,
|
|
// you must define int prefix##ll =0; and use macro SET_LLOC(prefix)
|
|
// in EVERY action consuming material (this can be done with #define
|
|
// YY_USER_ACTION) and in bison you must use option %locations.
|
|
|
|
#ifndef OG_LOCATION_H
|
|
#define OG_LOCATION_H
|
|
|
|
namespace ogp
|
|
{
|
|
struct location_type
|
|
{
|
|
int off{0}; // offset of the token
|
|
int ll{0}; // length ot the token
|
|
location_type() = default;
|
|
};
|
|
};
|
|
|
|
// set current off to the first off and add all lengths
|
|
#define YYLLOC_DEFAULT(Current, Rhs, N) \
|
|
{ \
|
|
(Current).off = (Rhs)[1].off; \
|
|
(Current).ll = 0; \
|
|
for (int i = 1; i <= N; i++) \
|
|
(Current).ll += (Rhs)[i].ll; \
|
|
}
|
|
|
|
#define SET_LLOC(prefix) (prefix ## lloc.off += prefix ## lloc.ll, prefix ## lloc.ll = prefix ## leng)
|
|
|
|
#endif
|