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Building a Programing Language – Part I (Creating BrainLess)

, 11 Oct 2013 LGPL3
This is the first of a series of articles where we will explore about writing compilers.
brainlessv0.1-noexe.zip
brainlessv0.1.zip
BrainLess
BrainLess.suo
BrainLess.vcproj.PSFT.smisra.user
m.bl
/*
Author : Shakti Misra
All are welcome to use these files, distribute, modify and release. But This notice should be included.
*/

#include "Interpreter.h"

void Interpreter::interpreteScript()//Main routine to start script interpretation. this is semantic analysis or meaning findout method.
{
    while(eTokenOver != m_lex.getNextToken())
    {
        switch(m_lex.getCurrentToken())
        {//Based on the tokens choose the path.
        case eRdAndStrVal:
            m_tapeVirtualMachine.getCharAndStore();break;
        case eDspCurVal:
            m_tapeVirtualMachine.displayChar();break;
        case eIncrContent:
            m_tapeVirtualMachine.incrementContent();break;
        case eDecrContent:
            m_tapeVirtualMachine.decrementContent();break;
        case eAddWithNext:
            m_tapeVirtualMachine.addWithNext();break;
        case eSubNext:
            m_tapeVirtualMachine.substractFromNext();break;
        case eIncrHead:
            m_tapeVirtualMachine.moveHeadForeward();break;
        case eDecrHead:
            m_tapeVirtualMachine.moveHeadBackward();break;
        case eExclaimationMark:
            intDisplayContent();break;
        }
    }
}

void Interpreter::intDisplayContent()
{//When we are in this function we know that it was due to ![eExclaimationMark] that this function is called.
    //So check for eLeftSqrParen eIntNumber eRightSqrParen structure.
    switch(m_lex.getNextToken())//The tokens group eExclaimationMark eLeftSqrParen eIntNumber eRightSqrParen is a valid token.
    {
    case eLeftSqrParen:
        int len = 0;
        if(eIntNumber == m_lex.getNextToken())
        {
           len = m_lex.getAttribVal();
        }
        if(eRightSqrParen == m_lex.getNextToken())
        {
            m_tapeVirtualMachine.displayMultiChar(len);
        }
    }
}

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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)

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About the Author

BrainlessLabs.com
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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