Function Class Reference

#include <function.h>

Collaboration diagram for Function:

Public Member Functions
	Function (ParameterList *pList, StatementList *sList)
	~Function ()
Number	apply (const SymbolTable &, const FunctionTable &, ExpressionList *) const
Number	apply (const SymbolTable &st, const FunctionTable &ft) const

Detailed Description

Definition at line 29 of file function.h.

Constructor & Destructor Documentation

Function()

Function::Function ( ParameterList *  pList, StatementList *  sList  )

inline

Definition at line 31 of file function.h.

: paramList(pList), stmtList(sList) { }

~Function()

Function::~Function

(

)

Definition at line 24 of file function.cpp.

                    {
   delete paramList;
   delete stmtList;
}

Member Function Documentation

apply() [1/2]

Number Function::apply	(	const SymbolTable &	st,
		const FunctionTable &	ft,
		ExpressionList *	argList
	)		const

Definition at line 39 of file function.cpp.

                                                                                                    {

   // copy existing symbol and function tables into local tables
   SymbolTable localST(st);
   FunctionTable localFT(ft);

   // ensure the correct number of args were passed
   if (paramList->size() != argList->size()) {
      throw ParameterMismatch();
   }

   // bind passed arguments to formal parameters in local symbol table
   list<string>::const_iterator      formalIt = paramList->begin();
   list<Expression*>::const_iterator argIt    = argList->begin();

   while (formalIt != paramList->end()) {
      localST[*formalIt] = (*argIt)->eval(st, ft);
      ++formalIt;
      ++argIt;
   } 

   // execute all statements in function. If the function throws a return value, return it
   try {
      stmtList->eval(localST, localFT);
   } catch (ReturnValue r) {
      return r.getValue();
   }
   
   // else, the function had no return statement. Return default 0.
   return Number(0);
}

apply() [2/2]

Number Function::apply	(	const SymbolTable &	st,
		const FunctionTable &	ft
	)		const

Definition at line 29 of file function.cpp.

                                                                           {
   // create dummy empty expressionList to pass to no-arg function
   ExpressionList* el = new ExpressionList();

   // evaluate the function
   Number n = apply(st, ft, el);
   delete el;
   return n;
}

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The documentation for this class was generated from the following files:

• function.h
• function.cpp