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