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Building a Programing Language – Part I (Creating BrainLess)

, 11 Oct 2013
This is the first of a series of articles where we will explore about writing compilers.
/*
Author : Shakti Misra
All are welcome to use these files, distribute, modify and release. But This notice should be included.
*/
#include "Helper.h"
#include <ctype.h>
#include <stdlib.h>

char FileRead::getNextCharInternal()
{
    if(NULL == m_pFile)
    {
        m_cCurChar = '\0';
        return m_cCurChar;
    }

    if(0 == m_iCount && !m_bEOFReached)
    {
        m_iCount = _fread_nolock(m_szBuffer, sizeof(char), DIM(m_szBuffer) - 1, m_pFile);
        m_iIndex = 0;
        if(m_iCount < DIM(m_szBuffer) - 1)
        {
            m_bEOFReached = feof(m_pFile);
        }
    }

    if(0 < m_iCount)
    {
        m_cCurChar = m_szBuffer[m_iIndex];
        m_szBuffer[--m_iCount, m_iIndex++] = '\0';
    }
    else if(true == m_bEOFReached)
    {
        m_cCurChar = '\0';
    }
     
    return m_cCurChar;
}

int FileRead::getNextNumber()
{
    char numStr[20] = {0};
    int index = 0;

    while( isdigit( numStr[index++] = getNextCharInternal() ) )
        ;//Empty while loop to get numbers
    numStr[--index] = '\0';

    unreadChar(m_cCurChar);

    return atoi(numStr);
}

bool FileRead::unreadChar(const char ch)
{
    if(0 > --m_iIndex)
        return false;

    m_szBuffer[++m_iCount, m_iIndex] = ch;

    return true;
}

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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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