1 files changed, 159 insertions, 0 deletions
diff --git a/qlparser/symtab.cc b/qlparser/symtab.cc
new file mode 100644
index 0000000..f96e49e
--- /dev/null
+++ b/qlparser/symtab.cc
@@ -0,0 +1,159 @@
+/*
+* This file is part of rasdaman community.
+*
+* Rasdaman community 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 of the License, or
+* (at your option) any later version.
+*
+* Rasdaman community 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 rasdaman community.  If not, see <http://www.gnu.org/licenses/>.
+*
+* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009 Peter Baumann /
+rasdaman GmbH.
+*
+* For more information please see <http://www.rasdaman.org>
+* or contact Peter Baumann via <baumann@rasdaman.com>.
+*/
+/*************************************************************************
+ *
+ *
+ * PURPOSE:
+ *   store symbols (identifiers) during the parse process
+ *
+ *
+ * COMMENTS:
+ *   none
+ *
+ ***********************************************************************/                                                             
+
+//**************************************************************
+// Symbol Table class
+//**************************************************************
+
+//**************************************************************
+// Implementation
+//**************************************************************
+
+#include "symtab.hh"
+
+// constructor
+template <class T>
+SymbolTable<T>::SymbolTable() {
+  initScope();
+  STVars.clear();
+}
+
+// destructor
+template <class T>
+SymbolTable<T>::~SymbolTable() {
+  exitScope();
+}
+
+// put symbol in keys and in the hash-table
+template <class T>
+bool SymbolTable<T>::putSymbol(const std::string& symbol, T value) {
+  bool retVal = false;
+  // if not locally declared
+  if ( (STVars.find(symbol) == STVars.end()) ) {
+    if (getSymbol(symbol) == 0) 
+      keys.push_back(symbol);
+    STVars[symbol] = value;
+    retVal = true;
+  } else 
+    retVal = false;
+  return retVal;  
+}
+
+// store symbol into hash-table
+template <class T>
+void SymbolTable<T>::storeSymbol( const std::string& symbol, T value ) {
+  STVars[symbol] = value;
+}
+
+// get symbol from table
+template <class T>
+T SymbolTable<T>::getSymbol( const std::string& symbol ) {
+  T retVal=NULL;
+
+  // find if locally declared
+  if ( !(STVars.find(symbol) == STVars.end()) )
+  {
+    retVal=STVars[symbol];
+  } 
+  else
+  {
+    // find if declared in outer scopes
+    size_t idx=STScopes.size();  
+    while (idx > 0) {
+      idx--;
+      if ( !(STScopes[idx].find(symbol) == STScopes[idx].end()) )
+        retVal=STScopes[idx][symbol];      
+    }
+  }
+  return retVal;
+}
+
+// lookup symbol in table
+template <class T>
+bool SymbolTable<T>::lookupSymbol( const std::string& symbol ) {
+  bool retVal=false;
+
+  // find if locally declared
+  if ( !(STVars.find(symbol) == STVars.end()) )
+  {
+    retVal=true;
+  }
+  else
+  {  
+    // find if declared in outer scopes
+    size_t idx = STScopes.size();  
+    while (idx > 0) {
+      idx--;
+      if ( !(STScopes[idx].find(symbol) == STScopes[idx].end()) )
+        retVal=true;      
+    }
+  }
+  return retVal;
+}
+
+// output the current scope
+template <class T>
+void SymbolTable<T>::outScope() {
+  RMInit::logOut << "Scope: " << STScopes.size() << endl;
+}
+
+// init scope by clearing inner symbols
+template <class T>
+void SymbolTable<T>::clearScope() {
+  STVars.clear();
+}
+
+// enter new scope
+template <class T>
+void SymbolTable<T>::initScope() {
+  STScopes.push_back(STVars);
+  STVars.clear();
+}
+
+// exit current scope to previous one
+template <class T>
+void SymbolTable<T>::exitScope() {
+  if (!STScopes.empty()) {
+    STVars = STScopes[STScopes.size() - 1];
+    STScopes.pop_back();
+  }
+}
+
+// wipe out everything from symbol table
+template <class T>
+void SymbolTable<T>::wipe() {
+  keys.clear();  
+  STVars.clear();
+  STScopes.clear();
+}