273 lines
8.5 KiB
C++
273 lines
8.5 KiB
C++
//
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// The developer of the original code and/or files is Tripwire, Inc.
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// Portions created by Tripwire, Inc. are copyright (C) 2000 Tripwire,
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// Inc. Tripwire is a registered trademark of Tripwire, Inc. All rights
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// reserved.
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//
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// This program is free software. The contents of this file are subject
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// to the terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2 of the License, or (at your
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// option) any later version. You may redistribute it and/or modify it
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// only in compliance with the GNU General Public License.
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//
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// This program is distributed in the hope that it will be useful.
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// However, this program is distributed AS-IS WITHOUT ANY
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// WARRANTY; INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS
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// FOR A PARTICULAR PURPOSE. Please see the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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//
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// Nothing in the GNU General Public License or any other license to use
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// the code or files shall permit you to use Tripwire's trademarks,
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// service marks, or other intellectual property without Tripwire's
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// prior written consent.
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//
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// If you have any questions, please contact Tripwire, Inc. at either
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// info@tripwire.org or www.tripwire.org.
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//
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///////////////////////////////////////////////////////////////////////////////
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// genreparseinfo.cpp -- helper classes that are called by yacc parser
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//
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#include "stdtwparser.h"
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//=========================================================================
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// INCLUDES
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//=========================================================================
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#include "parserhelper.h"
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#include "fco/twfactory.h"
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#include "fco/fconameinfo.h"
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#include "fco/genreswitcher.h"
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#include "fco/parsergenreutil.h"
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//=========================================================================
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// STANDARD LIBRARY INCLUDES
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//=========================================================================
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//=========================================================================
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// DEFINES AND MACROS
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//=========================================================================
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//=========================================================================
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// OTHER DIRECTIVES
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//=========================================================================
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//=========================================================================
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// GLOBALS
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//=========================================================================
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//=========================================================================
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// UTIL FUNCTION PROTOTYES
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//=========================================================================
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//=========================================================================
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// METHOD CODE
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//=========================================================================
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cGenreParseInfo::cGenreParseInfo()
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{
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InitPredefinedVariables();
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}
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///////////////////////////////////////////////////////////////////////////////
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// AddStopPoint
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// NOTE: the list copies the string, so it is safe for the parser to
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// free the lexeme
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///////////////////////////////////////////////////////////////////////////////
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void
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cGenreParseInfo::AddStopPoint( const cFCOName& name )
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{
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mStopList.push_back( name );
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}
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///////////////////////////////////////////////////////////////////////////////
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// AddRule -- adds the specified rule to our list. we will eventually call
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// MakeFCOSpecs(), which will use this list as its source.
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//
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// NOTE: the list is responsible for freeing the pointers
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///////////////////////////////////////////////////////////////////////////////
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void
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cGenreParseInfo::AddRule(const cParseRule *pnode)
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{
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mRuleList.push_back(pnode);
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}
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///////////////////////////////////////////////////////////////////////////////
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// RulePointAlreadyDefined -- returns true if the given name was already used
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// as a start or stop point
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///////////////////////////////////////////////////////////////////////////////
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bool cGenreParseInfo::RulePointAlreadyDefined( const cFCOName& fcoName )
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{
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bool fFound = false;
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// check start points
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for( RuleListType::iterator i = mRuleList.begin(); i != mRuleList.end(); i++ )
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{
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if( (*i)->GetName() == fcoName )
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fFound = true;
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}
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// check stop points
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if( ! fFound )
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{
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for( StopListType::iterator j = mStopList.begin(); j != mStopList.end(); j++ )
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{
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if( *j == fcoName )
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fFound = true;
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}
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}
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return( fFound );
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}
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///////////////////////////////////////////////////////////////////////////////
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// InitPredefinedVariables --
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///////////////////////////////////////////////////////////////////////////////
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void cGenreParseInfo::InitPredefinedVariables()
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{
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iParserGenreUtil* pGU = iTWFactory::GetInstance()->CreateParserGenreUtil();
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TSTRING sVarName, sValue;
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int index = 0;
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while( pGU->EnumPredefinedVariables( index++, sVarName, sValue ) )
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{
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mLocalPredefVarTable.Insert( sVarName, sValue );
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// DoVarSubstitution()
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// replaces any $(VAR) in string with it's value, unless the $ is escaped with
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// a backslash. Fails if symbol isn't found
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///////////////////////////////////////////////////////////////////////////////
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bool cGenreParseInfo::DoVarSubstitution( TSTRING &rval ) //throw( eParserHelper )
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{
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cDebug d("cConfigFile::DoVarSubst()");
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d.TraceDebug("ORIG: %s\n", rval.c_str());
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// walk through string
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// look for $(
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// find matching )
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// pick out subset
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// look up in symbol table
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// substitute subset
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// continue iterating
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// step through string
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// iterate to (slen-1), because we are looking for a two-character sentinel "$("
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bool fEscaping = false;
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for (TSTRING::size_type i = 0; i < rval.size(); i++)
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{
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TCHAR c = rval[i];
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// is it the "$(" sentinel? (an escaped '$' is not a variable)
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if (c == '$' && ! fEscaping )
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{
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c = rval[i+1];
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if (c == '(')
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{
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// ooh, wow! it's a variable! find the end
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bool found = false;
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TSTRING::size_type j;
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for (j = i+1; j < rval.size(); j++)
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{
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if (rval[j] == ')')
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{
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found = true;
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break;
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}
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}
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// did we find it?
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if (!found)
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{
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// TODO: throw error
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return false;
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}
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// otherwise, cut out the variable name
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TSTRING::size_type begin = i + 2;
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TSTRING::size_type size = j - i - 2;
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TSTRING varname;
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varname = rval.substr(begin, size);
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d.TraceDebug("symbol = %s\n", varname.c_str());
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// look up in symbol table
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TSTRING varvalue;
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if ( ! LookupVariable( varname, varvalue ) )
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throw eParserUseUndefVar( varname );
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// replace varname with varvalue
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rval.replace(begin-2, size+3, varvalue);
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d.TraceDebug("POST: %s\n", rval.c_str());
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// no no no
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// we should exit function, and get called again
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// update counters
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// we should bump the cursor over by the length of the
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// varvalue (minus one, to compensate for post-increment of index)
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i += varvalue.size() - 1;
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goto nextchar;
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}
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}
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else if (c == '\\')
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{
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fEscaping = ! fEscaping;
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}
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else
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{
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fEscaping = false;
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}
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nextchar:
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;
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}
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d.TraceDebug("DONE: %s\n", rval.c_str());
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// switch around
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Insert -- add definition to symbol table
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///////////////////////////////////////////////////////////////////////////////
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bool cGenreParseInfo::InsertVariable( const TSTRING& var, const TSTRING& val ) //throw( eParserHelper )
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{
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TSTRING dummy;
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// don't let them redefine predefined vars
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if( mLocalPredefVarTable.Lookup(var, dummy) )
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throw eParserRedefineVar( var );
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return mLocalVarTable.Insert( var, val );
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}
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///////////////////////////////////////////////////////////////////////////////
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// Lookup -- returns value, or returns false
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// This method will return false only if the given variable is not defined
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// in any of the three symbol tables.
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///////////////////////////////////////////////////////////////////////////////
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bool cGenreParseInfo::LookupVariable( const TSTRING& var, TSTRING& val )
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{
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if( mLocalPredefVarTable.Lookup( var, val ) || mLocalVarTable.Lookup( var, val ) )
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return true;
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else
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return ( cParserHelper::GetGlobalVarTable().Lookup( var, val ) );
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}
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