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/*** expand.c *****************************************************************
**
** This file is part of BibTool.
** It is distributed under the GNU General Public License.
** See the file COPYING for details.
**
** (c) 1996-2020 Gerd Neugebauer
**
** Net: gene@gerd-neugebauer.de
**
** 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 2, 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.
**
**-----------------------------------------------------------------------------
** Description:
** This module contains functions to expand macros as they are
** appearing in right hand sides of equations. This can be used
** to get rid of additional macro definitions.
**
******************************************************************************/
#include <bibtool/general.h>
#include <bibtool/error.h>
#include <bibtool/expand.h>
#include <bibtool/symbols.h>
#include <bibtool/macros.h>
#include <bibtool/sbuffer.h>
/*****************************************************************************/
/* Internal Programs */
/*===========================================================================*/
#ifdef __STDC__
#define _ARG(A) A
#else
#define _ARG(A) ()
#endif
Symbol expand_rhs _ARG((Symbol s,Symbol pre,Symbol post,DB db, bool lowercase));/* expand.c*/
static bool expand _ARG((String s,StringBuffer *sb,int brace,int first,String q_open,String q_close,DB db));/* expand.c*/
static void expand__ _ARG((String s,StringBuffer *sb,String q_open,String q_close,DB db));/* expand.c*/
/*****************************************************************************/
/* External Programs */
/*===========================================================================*/
/*---------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------
** Function: expand_rhs()
** Purpose: Expand the right hand side of an item. Each macro
** which is defined in this database is replaced by its
** value. The result is kept in a static variable until
** the next invocation of this function overwrites it.
** Arguments:
** s String to expand
** pre This is the opening brace character to be used. For
** \BibTeX{} the valid values are |{| or |"|. This value
** has to match to |post|.
** post This is the closing brace character to be used. For
** \BibTeX{} the valid values are |}| or |"|. This value
** has to match to |pre|.
** db Database containing the macros.
** lowercase
** Returns: A pointer to the expanded string. This value is kept in a
** static variable of this function and will be overwritten with
** the next invocation.
**___________________________________________________ */
Symbol expand_rhs(sym,pre,post,db,lowercase) /* */
Symbol sym; /* */
Symbol pre; /* */
Symbol post; /* */
DB db; /* */
bool lowercase; /* */
{ static StringBuffer *sb = NULL; /* */
String s; /* */
/* */
DebugPrint1("expand_rhs"); /* */
if ( sb == NULL && (sb = sbopen()) == NULL ) /* */
{ OUT_OF_MEMORY("string expansion");} /* */
/* */
DebugPrint2("Expanding ",SymbolValue(sym)); /* */
/* */
sbrewind(sb); /* */
expand__(SymbolValue(sym), /* */
sb, /* */
SymbolValue(pre), /* */
SymbolValue(post), /* */
db); /* */
s = (String)sbflush(sb); /* */
return symbol(lowercase ? lower(s): s); /* */
} /*------------------------*/
#define PUTS(S,SB) (void)sbputs((char*)S,SB)
#define PUTC(C,SB) (void)sbputchar(C,SB)
/*-----------------------------------------------------------------------------
** Function*: expand__()
** Purpose: Wrapper for expand().
** Things have to be cleaned up afterwards.
** Arguments:
** s the string
** sb the string buffer
** q_open the open characters
** q_close the close characters
** db the database
** Returns: nothing
**___________________________________________________ */
static void expand__(s, sb, q_open, q_close, db) /* */
register String s; /* */
StringBuffer *sb; /* */
String q_open; /* */
String q_close; /* */
DB db; /* */
{ /* */
if (!expand(s,sb,true,true,q_open,q_close,db)) /* */
{ PUTS(q_close, sb); } /* */
else if (sbtell(sb) == 0) /* */
{ PUTS(q_open, sb); /* */
PUTS(q_close, sb); /* */
} /* */
} /*------------------------*/
/*-----------------------------------------------------------------------------
** Function*: expand()
** Purpose:
**
**
** Arguments:
** s String to apply expansion to.
** sb String buffer which will receive the output.
** brace Boolean. Determine if braces should be used.
** The strings of the braces are in q_open and q_close.
** first In multi parts determine if this is the first part.
** q_open Open delimiter. This is an open brace or a double quote.
** q_close Close delimiter. This is a close brace or a double quote.
** Returns:
**___________________________________________________ */
static bool expand(s, sb, brace, first, q_open, q_close, db)/* */
register String s; /* specification */
StringBuffer *sb; /* output device */
bool brace; /* is a brace needed? */
bool first; /* is this the first part?*/
String q_open; /* open delimiter */
String q_close; /* close delimiter */
DB db; /* */
{ /* */
while ( *s ) /* */
{ /* */
switch ( *s ) /* */
{ case '\0': break; /* Just in case. */
case '"': /* Start a string part. */
DebugPrint2("Start String:", s); /* */
if ( *++s == '"' ) { ++s; break; } /* Ignore the empty string*/
if ( brace ) /* */
{ if ( !first ) { PUTS(" # ",sb); } /* */
PUTS(q_open,sb); /* */
brace = false; /* */
} /* */
first = false; /* */
/* */
for ( ; *s && *s != '"'; ++s ) /* Until the end is found */
{ PUTC(*s,sb); /* transfer character. */
if ( *s == '\\' && *(s+1) ) /* \ is for quoting. */
{ ++s; PUTC(*s,sb); } /* */
} /* */
if ( *s ) ++s; /* Advance if not end */
break; /* */
case '{': /* Start a block. */
DebugPrint2("Start block:",s); /* */
if ( *++s == '}' ) { ++s; break; } /* Ignore empty block. */
if ( brace ) /* */
{ if ( !first ) { PUTS(" # ",sb); } /* */
PUTS(q_open,sb); /* */
brace = false; /* */
} /* */
first = false; /* */
/* */
{ register int level = 1; /* Initialize brace count */
for ( ; *s && level > 0; ++s ) /* Until level 0 or end */
{ switch ( *s ) /* */
{ case '\\': /* \ is for quoting. */
PUTC(*s,sb); /* */
if (*++s) { PUTC(*s,sb); } /* */
break; /* */
case '{': /* */
++level; /* */
PUTC(*s,sb); /* */
break; /* */
case '}': /* */
if ( --level > 0 ) PUTC(*s,sb); /* */
break; /* */
default: /* */
PUTC(*s,sb); /* */
} /* */
} /* */
} /* */
break; /* */
case '#': ++s; break; /* Silently assume #. */
case '0': case '1': case '2': case '3': case '4':/* Start a number */
case '5': case '6': case '7': case '8': case '9':/* */
DebugPrint2("Start number:",s); /* */
/* */
if ( brace ) /* */
{ if ( !first ) { PUTS(" # ",sb); } /* */
PUTS(q_open,sb); /* */
brace = false; /* */
} /* */
first = false; /* */
/* */
do /* */
{ PUTC(*s,sb); /* */
++s; /* */
} while ( is_digit(*s) ); /* */
break; /* */
default: /* */
if ( is_space(*s) ) ++s; /* Ignore spaces. */
else if (!is_allowed(*s)) /* */
{ PUTC(*s, sb); /* */
s++; /* */
} /* */
else /* Only macros are left. */
{ String t = (String)s; /* */
Symbol val; /* */
Symbol sym = sym_extract(&t, false); /* */
/* */
DebugPrint2("Start symbol: ", s); /* */
val = db_string(db, sym, 1); /* */
if ( val ) /* */
{ brace = expand(SymbolValue(val), /* */
sb, /* */
brace, /* */
first, /* */
q_open, /* */
q_close, /* */
db); } /* */
else /* */
{ if ( !brace ) PUTS(q_close, sb); /* */
if ( !first ) PUTS(" # ", sb); /* */
PUTS(sym, sb); /* */
brace = true; /* */
first = false; /* */
} /* */
s = t; /* */
} /* */
} /* */
} /* */
return brace; /* */
} /*------------------------*/
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