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/* symtab.h: declarations for our symbol table manipulations.
Copyright (C) 1992, 1993, 2011 Free Software Foundation, Inc.
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, 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef SYMTAB_H
#define SYMTAB_H
#include <kpathsea/types.h>
#include "char.h"
#include "realstrval.h"
/* What a single symbol looks like. */
typedef struct
{
symval_tag_type tag;
union
{
real_string_val_type real_string_val;
char_type char_val;
} value;
} symval_type;
/* Accessor macros. */
#define SYMVAL_TAG(s) ((s).tag)
#define SYMVAL_CHAR(s) ((s).value.char_val)
#define SYMVAL_REAL(s) ((s).value.real_string_val.real_val)
#define SYMVAL_REAL_STRING(s) ((s).value.real_string_val)
#define SYMVAL_STRING(s)((s).value.real_string_val.string_val)
/* Create new value nodes of the various types. */
extern symval_type symtab_char_node (symval_type lsb, symval_type rsb);
extern symval_type symtab_real_node (real);
extern symval_type symtab_real_string_node (real, string);
extern symval_type symtab_string_node (string);
/* Define the identifier KEY to be the value V. Overwrite any
previous definition of KEY. */
extern void symtab_define (string key, symval_type v);
/* Define a kern K between the characters named LEFT and RIGHT. */
extern void symtab_define_kern (string left, string right, symval_type k);
/* Return the value of KEY, or NULL. */
extern symval_type *symtab_lookup (string key);
/* Resolve KEY to a real if possible and return the result. If it
cannot be resolved, give a fatal error. */
extern real symtab_lookup_real (string key);
/* Resolve the definition of SV to a real, if possible. Return success. */
extern boolean symval_resolve (symval_type *sv);
/* Return a string describing SV (e.g., for error messages). The string
is allocated with malloc. */
extern string symval_as_string (symval_type sv);
#endif /* not SYMTAB_H */
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