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#include "yacasbase.h" |
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#include "lispenvironment.h" |
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#include "lisphash.h" |
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#include "grower.h" |
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#include "evalfunc.h" |
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/// Abstract class providing the basic user function API. |
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/// via an associated hash table. When obtained, they can be used to |
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/// evaluate the function with some arguments. |
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class LispUserFunction : public EvalFuncBase |
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public: |
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LispUserFunction() : iFenced(LispTrue),iTraced(LispFalse) {}; |
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virtual ~LispUserFunction(); |
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virtual void Evaluate(LispPtr& aResult,LispEnvironment& aEnvironment, |
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LispPtr& aArguments)=0; |
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virtual void HoldArgument(LispString * aVariable) = 0; |
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virtual void DeclareRule(LispInt aPrecedence, LispPtr& aPredicate, |
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LispPtr& aBody) = 0; |
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virtual void DeclareRule(LispInt aPrecedence, LispPtr& aBody) = 0; |
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virtual void DeclarePattern(LispInt aPrecedence, LispPtr& aPredicate, |
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LispPtr& aBody) = 0; |
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virtual LispPtr& ArgList() = 0; |
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public: //unfencing |
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inline LispBoolean Fenced() {return iFenced;}; |
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public: //tracing |
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inline void Trace() {iTraced = LispTrue;}; |
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inline void UnTrace() {iTraced = LispFalse;}; |
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inline LispBoolean Traced() {return iTraced;}; |
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private: |
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LispBoolean iFenced; |
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LispBoolean iTraced; |
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}; |
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/// arguments) of the function is now fixed. |
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class LispArityUserFunction : public LispUserFunction |
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public: |
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virtual LispInt Arity() const = 0; |
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virtual LispInt IsArity(LispInt aArity) const = 0; |
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}; |
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/// different arities) to one name. A specific LispArityUserFunction |
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/// can be selected by providing its name. Additionally, the name of |
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/// the file in which the function is defined, can be specified. |
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class LispMultiUserFunction : public YacasBase |
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public: |
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/// Constructor. |
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LispMultiUserFunction() : iFunctions(),iFileToOpen(NULL) {}; |
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/** When adding a multi-user function to the association hash table, the copy constructor is used. |
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* Casually having a copy-constructor on CDeletingArrayGrower should be avoided, to make sure it is |
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* not used accidentally. |
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*/ |
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inline LispMultiUserFunction(const LispMultiUserFunction& aOther) : iFunctions(), iFileToOpen(NULL) |
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{ |
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LISPASSERT(aOther.iFileToOpen == 0); |
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LISPASSERT(aOther.iFunctions.Size() == 0); |
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} |
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inline LispMultiUserFunction& operator=(const LispMultiUserFunction& aOther) |
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{ |
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// copy constructor not written yet, hence the assert |
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LISPASSERT(aOther.iFileToOpen == 0); |
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LISPASSERT(aOther.iFunctions.Size() == 0); |
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LISPASSERT(iFileToOpen == 0); |
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return *this; |
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} |
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/// Return user function with given arity. |
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/// Destructor. |
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/// Specify that some argument should be held. |
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/// Add another LispArityUserFunction to #iFunctions. |
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/// Delete tuser function with given arity. |
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private: |
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CDeletingArrayGrower > iFunctions; |
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public: |
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LispDefFile* iFileToOpen; |
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}; |
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class LispUserFunctions : public LispAssociatedHash |
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}; |
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