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/* Project STARS
John DiCamillo Software Consulting
Copyright © 1997-2000. All Rights Reserved.
SUBSYSTEM: Stars
FILE: term.h
AUTHOR: John DiCamillo
OVERVIEW
========
Declaration of the Abstract Syntax Tree classes
*/
#ifndef TERM_H
#define TERM_H
#include "Text.h"
#include "List.h"
// +-------------------------------------------------------------------+
class Term;
class TermBool;
class TermNumber;
class TermText;
class TermArray;
class TermDef;
class TermStruct;
// +-------------------------------------------------------------------+
class Term
{
public:
static const char* TYPENAME() { return "Term"; }
Term() { }
virtual ~Term() { }
virtual int operator==(const Term& rhs) const { return 0; }
virtual void print(int level=10) { }
// conversion tests
virtual Term* touch() { return this; }
virtual TermBool* isBool() { return 0; }
virtual TermNumber* isNumber() { return 0; }
virtual TermText* isText() { return 0; }
virtual TermArray* isArray() { return 0; }
virtual TermDef* isDef() { return 0; }
virtual TermStruct* isStruct() { return 0; }
};
Term* error(char*, char* = 0);
// +-------------------------------------------------------------------+
typedef List<Term> TermList;
typedef ListIter<Term> TermListIter;
// +-------------------------------------------------------------------+
class TermBool : public Term
{
public:
static const char* TYPENAME() { return "TermBool"; }
TermBool(bool v) : val(v) { }
virtual void print(int level=10);
virtual TermBool* isBool() { return this; }
bool value() const { return val; }
private:
bool val;
};
// +-------------------------------------------------------------------+
class TermNumber : public Term
{
public:
static const char* TYPENAME() { return "TermNumber"; }
TermNumber(double v) : val(v) { }
virtual void print(int level=10);
virtual TermNumber* isNumber() { return this; }
double value() const { return val; }
private:
double val;
};
// +-------------------------------------------------------------------+
class TermText : public Term
{
public:
static const char* TYPENAME() { return "TermText"; }
TermText(const Text& v) : val(v) { }
virtual void print(int level=10);
virtual TermText* isText() { return this; }
Text value() const { return val; }
private:
Text val;
};
// +-------------------------------------------------------------------+
class TermArray : public Term
{
public:
static const char* TYPENAME() { return "TermArray"; }
TermArray(TermList* elist);
virtual ~TermArray();
virtual void print(int level=10);
virtual TermArray* isArray() { return this; }
TermList* elements() { return elems; }
private:
TermList* elems;
};
// +-------------------------------------------------------------------+
class TermStruct : public Term
{
public:
static const char* TYPENAME() { return "TermStruct"; }
TermStruct(TermList* elist);
virtual ~TermStruct();
virtual void print(int level=10);
virtual TermStruct* isStruct() { return this; }
TermList* elements() { return elems; }
private:
TermList* elems;
};
// +-------------------------------------------------------------------+
class TermDef : public Term
{
public:
static const char* TYPENAME() { return "TermDef"; }
TermDef(TermText* n, Term* v) : mname(n), mval(v) { }
virtual ~TermDef();
virtual void print(int level=10);
virtual TermDef* isDef() { return this; }
virtual TermText* name() { return mname; }
virtual Term* term() { return mval; }
private:
TermText* mname;
Term* mval;
};
#endif
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