demotool/opcomp.hh

#pragma once
#include "filewatcher.hh"
#include "opast.hh"
#include <ebcl/SRDData.hh>


/*= PARSER ===================================================================*/

// Parser output. Consists in a root node as well as other details (table of
// constants, data types, etc...)
struct T_OpsParserOutput
{
	opast::T_RootNode root;
	T_KeyValueTable< T_String , opast::E_DataType > types;
};

// The actual parser
class T_OpsParser : public ebcl::A_PrivateImplementation
{
    private:
	T_Array< ebcl::T_SRDError > errors_;
	T_OwnPtr< T_OpsParserOutput > output_;

    public:
	T_OpsParser( ) noexcept;

	bool parse( ebcl::T_SRDList const& input ) noexcept;

	T_Array< ebcl::T_SRDError > const& errors( ) const noexcept
		{ return errors_; }

	T_OwnPtr< T_OpsParserOutput > result( ) noexcept
		{ return std::move( output_ ); }
};


/*= COMPILER ===================================================================*/

namespace ops { struct T_OpProgram; using P_OpProgram = T_OwnPtr< T_OpProgram >; }

// Generates bytecode based on the type-checked tree produced by the parser
class T_OpsCompiler : public ebcl::A_PrivateImplementation
{
    public:
	T_OpsCompiler( ) noexcept;

	ops::P_OpProgram compile( T_OpsParserOutput const& input ) noexcept;
};


/*= SCRIPT MANAGER =============================================================*/

// The script manager watches over the demo's script, attempting to reload it if
// it is changed.
class T_ScriptManager
{
    private:
	T_WatchedFiles watcher_;

	T_OpsParser parser_;
	T_OpsCompiler compiler_;

	ops::P_OpProgram output_;
	T_Array< ebcl::T_SRDError > errors_;

    public:
	T_ScriptManager( ) noexcept;

	bool hasNewProgram( ) const noexcept
		{ return bool( output_ ); }

	ops::P_OpProgram program( ) noexcept
		{ return std::move( output_ ); }

	T_Array< ebcl::T_SRDError > const& errors( ) const noexcept
		{ return errors_; }

    private:
	void loadScript( ) noexcept;
};