stream.h

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#pragma once
#include "defs.h"
#ifndef PAULA_MINI
#include <fstream>
#endif
 
namespace paula
{
    namespace core { class TreeIterator; }
    class Var;
 
    // OUTPUT
 
    class IOutputStream
    {
    public:
        virtual void flush()  const = 0;
        virtual void close()  const = 0;
        virtual bool closed() const = 0;
    };
    class POut : public IOutputStream
    {
    public:
 
        virtual void flush()  const = 0;
 
        // paula printing interface
        
        virtual const POut& print(char) const = 0; // eg. std::cout<<c; return *this;
        virtual const POut& print(const char*) const = 0;
        virtual const POut& print(long) const = 0;
        virtual const POut& print(double) const = 0;
 
        const POut& print(int x) const;
        const POut& print(float x) const;
        const POut& print(bool x) const;
        const POut& printHex(INT i) const;
        const POut& printCharSymbol(CHAR c) const;
        const POut& print(const Error* a) const;
        const POut& println(const char*) const;
        const POut& endl() const;
 
        const POut& print(const core::TreeIterator& x) const;
 
        const POut& print(const Var& x) const;
 
        // TODO
        // printIntsToText(x*)
    };
 
    class NullPrint
    {
        // dummy printer that does nothing.
        // use to get debug prints optimized away on release.
    public:
        void flush() const;
        const NullPrint& print(const char*) const;
        const NullPrint& print(double) const; // take care of all numbers and bool
        const NullPrint& printHex(INT i) const;
        const NullPrint& printCharSymbol(CHAR c) const;
        const NullPrint& print(const Error* a) const;
        const NullPrint& println(const char*) const;
        const NullPrint& print(const core::TreeIterator& x) const;
        const NullPrint& print(const Var& x) const;
        const NullPrint& endl() const;
    };
    class STDOut : public POut
    {
    public:
        // Inherited via POut
        void flush()  const override;
        void close()  const override;
        bool closed() const override;
        const POut& print(char) const override;
        const POut& print(const char*) const override;
        const POut& print(long) const override;
        const POut& print(double) const override;
    };
    class STDErr : public POut
    {
    public:
        // Inherited via POut
        void flush()  const override;
        void close()  const override;
        bool closed() const  override;
        const POut& print(char) const override;
        const POut& print(const char*) const override;
        const POut& print(long) const override;
        const POut& print(double) const override;
    };
 
    // INPUT
 
    class IInputStream
    {
    public:
        virtual bool read(BYTE&) = 0; // we don't know we're at end before reaching it
        virtual void close() = 0;
    };
    class CharInput : public IInputStream
    {
    public:
        CharInput(const char *);
        bool read(BYTE&) override;
        void close() override;
    private:
        const char * str;
        INT i;
    };
    class StandardInput : public IInputStream
    {
    public:
        StandardInput() {};
        // Inherited via IInputStream
        bool read(BYTE&) override;
        void close() override;
    };
 
#ifndef PAULA_MINI
    class FileInput : public IInputStream
    {
    private:
        std::ifstream file; // The internal ifstream object
        FileInput() = delete;
    public:
        static bool exists(const std::string& name);
 
        explicit FileInput(const char *);
        ~FileInput();
        // Inherited via IInputStream
        bool read(BYTE&) override;
        void close() override;
        const bool found;
    };
#endif
}