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Building a Programming Language: Part II (Adding Conditions, Loop and Blocks to BrainLess)

, 11 Oct 2013
In this article, we will discuss implementing conditional statements, loops and blocks.
#ifndef __BRAINLESS_INTERPRETER__
#define __BRAINLESS_INTERPRETER__
/*
Author : Shakti Misra
All are welcome to use these files, distribute, modify and release. But This notice should be included.
This software is given as is, for use and modification.
*/
#include "VMInterface.h"
#include "TapeMachine.h"
#include "Lexer.h"
#include <map>
#include <string>

using namespace std;

typedef map<string, ulong> symTable;
/*This class starts the interpretation of the instructions. This will find out the meaning and interprete.*/
class Interpreter
{
private:
	Lex m_lex;//We will need a lexer to get the tokens from the source file
	TapeMachine<ulong, IOInterface, TAPE_SIZE> m_tapeVirtualMachine;//We will interprete the meaning of the above tokens and we will invoke the proper function in the VM
	const string m_sFileName;

	symTable m_funSymTable;

	int _ifCount;

public:
	Interpreter(string sFileName, string sTokenFile = ""):
	  m_sFileName(sFileName),
		  m_lex(sFileName),
		  _ifCount(0)
	  {
	  }

	  ~Interpreter()
	  {
	  }

	  void interpreteScript();

private:
	void ExecuteSentence();
	bool isBlankOrNull(const char*);

	void compareWithNext();
	void compareWithNextBoolean();
	void IFBlock();
	void Sentence();
	void Block();
	void DOLoop();
	void intDisplayContent();
};

#endif //__BRAINLESS_INTERPRETER__

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License

This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)

About the Author

BrainlessLabs
Engineer
India India
I like to explore different aspects of technology. Try new things, and get delighted. My interests are programming language, and Imaging. But its not hard to work on other things also. Algorithms delight me over a coffee break.
 
I basically code in C++, but JAVA is not so alien for me. I know few scripting languages also. Basically I feel that knowing a programing language is just a matter of getting introduced to it.
 
For my other articles check my blog on homepage
http://brainlesslabs.com/
 
https://github.com/BrainlessLabs
 
http://www.luxrender.net/en_GB/authors_contributors - SMISRA
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