org.directwebremoting.json.parse.javacc.SimpleCharStream Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.
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/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 4.0 */
package org.directwebremoting.json.parse.javacc;

/**
 * An implementation of interface CharStream, where the stream is assumed to
 * contain only ASCII characters (without unicode processing).
 */

public class SimpleCharStream
{
    public static final boolean staticFlag = false;

    int bufsize;

    int available;

    int tokenBegin;

    public int bufpos = -1;

    protected int bufline[];

    protected int bufcolumn[];

    protected int column = 0;

    protected int line = 1;

    protected boolean prevCharIsCR = false;

    protected boolean prevCharIsLF = false;

    protected java.io.Reader inputStream;

    protected char[] buffer;

    protected int maxNextCharInd = 0;

    protected int inBuf = 0;

    protected int tabSize = 8;

    protected void setTabSize(int i)
    {
        tabSize = i;
    }

    /**
     * @param i Eh? parameters to a getter?
     * @return ...
     */
    protected int getTabSize(int i)
    {
        return tabSize;
    }

    protected void ExpandBuff(boolean wrapAround)
    {
        char[] newbuffer = new char[bufsize + 2048];
        int newbufline[] = new int[bufsize + 2048];
        int newbufcolumn[] = new int[bufsize + 2048];

        try
        {
            if (wrapAround)
            {
                System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
                System.arraycopy(buffer, 0, newbuffer, bufsize - tokenBegin, bufpos);
                buffer = newbuffer;

                System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
                System.arraycopy(bufline, 0, newbufline, bufsize - tokenBegin, bufpos);
                bufline = newbufline;

                System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
                System.arraycopy(bufcolumn, 0, newbufcolumn, bufsize - tokenBegin, bufpos);
                bufcolumn = newbufcolumn;

                maxNextCharInd = (bufpos += (bufsize - tokenBegin));
            }
            else
            {
                System.arraycopy(buffer, tokenBegin, newbuffer, 0, bufsize - tokenBegin);
                buffer = newbuffer;

                System.arraycopy(bufline, tokenBegin, newbufline, 0, bufsize - tokenBegin);
                bufline = newbufline;

                System.arraycopy(bufcolumn, tokenBegin, newbufcolumn, 0, bufsize - tokenBegin);
                bufcolumn = newbufcolumn;

                maxNextCharInd = (bufpos -= tokenBegin);
            }
        }
        catch (Throwable t)
        {
            throw new Error(t.getMessage());
        }

        bufsize += 2048;
        available = bufsize;
        tokenBegin = 0;
    }

    protected void FillBuff() throws java.io.IOException
    {
        if (maxNextCharInd == available)
        {
            if (available == bufsize)
            {
                if (tokenBegin > 2048)
                {
                    bufpos = maxNextCharInd = 0;
                    available = tokenBegin;
                }
                else if (tokenBegin < 0)
                {
                    bufpos = maxNextCharInd = 0;
                }
                else
                {
                    ExpandBuff(false);
                }
            }
            else if (available > tokenBegin)
            {
                available = bufsize;
            }
            else if ((tokenBegin - available) < 2048)
            {
                ExpandBuff(true);
            }
            else
            {
                available = tokenBegin;
            }
        }

        int i;
        try
        {
            if ((i = inputStream.read(buffer, maxNextCharInd, available - maxNextCharInd)) == -1)
            {
                inputStream.close();
                throw new java.io.IOException();
            }
            else
            {
                maxNextCharInd += i;
            }
            return;
        }
        catch (java.io.IOException e)
        {
            --bufpos;
            backup(0);
            if (tokenBegin == -1)
            {
                tokenBegin = bufpos;
            }
            throw e;
        }
    }

    public char BeginToken() throws java.io.IOException
    {
        tokenBegin = -1;
        char c = readChar();
        tokenBegin = bufpos;

        return c;
    }

    protected void UpdateLineColumn(char c)
    {
        column++;

        if (prevCharIsLF)
        {
            prevCharIsLF = false;
            line += (column = 1);
        }
        else if (prevCharIsCR)
        {
            prevCharIsCR = false;
            if (c == '\n')
            {
                prevCharIsLF = true;
            }
            else
            {
                line += (column = 1);
            }
        }

        switch (c)
        {
        case '\r':
            prevCharIsCR = true;
            break;
        case '\n':
            prevCharIsLF = true;
            break;
        case '\t':
            column--;
            column += (tabSize - (column % tabSize));
            break;
        default:
            break;
        }

        bufline[bufpos] = line;
        bufcolumn[bufpos] = column;
    }

    public char readChar() throws java.io.IOException
    {
        if (inBuf > 0)
        {
            --inBuf;

            if (++bufpos == bufsize)
            {
                bufpos = 0;
            }

            return buffer[bufpos];
        }

        if (++bufpos >= maxNextCharInd)
        {
            FillBuff();
        }

        char c = buffer[bufpos];

        UpdateLineColumn(c);
        return (c);
    }

    /**
     * @deprecated
     * @see #getEndColumn
     * @return ...
     */
    @Deprecated
    public int getColumn()
    {
        return bufcolumn[bufpos];
    }

    /**
     * @deprecated
     * @see #getEndLine
     * @return ...
     */
    @Deprecated
    public int getLine()
    {
        return bufline[bufpos];
    }

    public int getEndColumn()
    {
        return bufcolumn[bufpos];
    }

    public int getEndLine()
    {
        return bufline[bufpos];
    }

    public int getBeginColumn()
    {
        return bufcolumn[tokenBegin];
    }

    public int getBeginLine()
    {
        return bufline[tokenBegin];
    }

    public void backup(int amount)
    {

        inBuf += amount;
        if ((bufpos -= amount) < 0)
        {
            bufpos += bufsize;
        }
    }

    public SimpleCharStream(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
    {
        inputStream = dstream;
        line = startline;
        column = startcolumn - 1;

        available = bufsize = buffersize;
        buffer = new char[buffersize];
        bufline = new int[buffersize];
        bufcolumn = new int[buffersize];
    }

    public SimpleCharStream(java.io.Reader dstream, int startline, int startcolumn)
    {
        this(dstream, startline, startcolumn, 4096);
    }

    public SimpleCharStream(java.io.Reader dstream)
    {
        this(dstream, 1, 1, 4096);
    }

    public void ReInit(java.io.Reader dstream, int startline, int startcolumn, int buffersize)
    {
        inputStream = dstream;
        line = startline;
        column = startcolumn - 1;

        if (buffer == null || buffersize != buffer.length)
        {
            available = bufsize = buffersize;
            buffer = new char[buffersize];
            bufline = new int[buffersize];
            bufcolumn = new int[buffersize];
        }
        prevCharIsLF = prevCharIsCR = false;
        tokenBegin = inBuf = maxNextCharInd = 0;
        bufpos = -1;
    }

    public void ReInit(java.io.Reader dstream, int startline, int startcolumn)
    {
        ReInit(dstream, startline, startcolumn, 4096);
    }

    public void ReInit(java.io.Reader dstream)
    {
        ReInit(dstream, 1, 1, 4096);
    }

    public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException
    {
        this(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
    }

    public SimpleCharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
    {
        this(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
    }

    public SimpleCharStream(java.io.InputStream dstream, String encoding, int startline, int startcolumn) throws java.io.UnsupportedEncodingException
    {
        this(dstream, encoding, startline, startcolumn, 4096);
    }

    public SimpleCharStream(java.io.InputStream dstream, int startline, int startcolumn)
    {
        this(dstream, startline, startcolumn, 4096);
    }

    public SimpleCharStream(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException
    {
        this(dstream, encoding, 1, 1, 4096);
    }

    public SimpleCharStream(java.io.InputStream dstream)
    {
        this(dstream, 1, 1, 4096);
    }

    public void ReInit(java.io.InputStream dstream, String encoding, int startline, int startcolumn, int buffersize) throws java.io.UnsupportedEncodingException
    {
        ReInit(encoding == null ? new java.io.InputStreamReader(dstream) : new java.io.InputStreamReader(dstream, encoding), startline, startcolumn, buffersize);
    }

    public void ReInit(java.io.InputStream dstream, int startline, int startcolumn, int buffersize)
    {
        ReInit(new java.io.InputStreamReader(dstream), startline, startcolumn, buffersize);
    }

    public void ReInit(java.io.InputStream dstream, String encoding) throws java.io.UnsupportedEncodingException
    {
        ReInit(dstream, encoding, 1, 1, 4096);
    }

    public void ReInit(java.io.InputStream dstream)
    {
        ReInit(dstream, 1, 1, 4096);
    }

    public void ReInit(java.io.InputStream dstream, String encoding, int startline, int startcolumn) throws java.io.UnsupportedEncodingException
    {
        ReInit(dstream, encoding, startline, startcolumn, 4096);
    }

    public void ReInit(java.io.InputStream dstream, int startline, int startcolumn)
    {
        ReInit(dstream, startline, startcolumn, 4096);
    }

    public String GetImage()
    {
        if (bufpos >= tokenBegin)
        {
            return new String(buffer, tokenBegin, bufpos - tokenBegin + 1);
        }
        else
        {
            return new String(buffer, tokenBegin, bufsize - tokenBegin) + new String(buffer, 0, bufpos + 1);
        }
    }

    public char[] GetSuffix(int len)
    {
        char[] ret = new char[len];

        if ((bufpos + 1) >= len)
        {
            System.arraycopy(buffer, bufpos - len + 1, ret, 0, len);
        }
        else
        {
            System.arraycopy(buffer, bufsize - (len - bufpos - 1), ret, 0, len - bufpos - 1);
            System.arraycopy(buffer, 0, ret, len - bufpos - 1, bufpos + 1);
        }

        return ret;
    }

    public void Done()
    {
        buffer = null;
        bufline = null;
        bufcolumn = null;
    }

    /**
     * Method to adjust line and column numbers for the start of a token.
     * @param newLine ...
     * @param newCol ...
     */
    public void adjustBeginLineColumn(int newLine, int newCol)
    {
        int start = tokenBegin;
        int len;

        if (bufpos >= tokenBegin)
        {
            len = bufpos - tokenBegin + inBuf + 1;
        }
        else
        {
            len = bufsize - tokenBegin + bufpos + 1 + inBuf;
        }

        int i = 0, j = 0, k = 0;
        int nextColDiff = 0, columnDiff = 0;

        while (i < len && bufline[j = start % bufsize] == bufline[k = ++start % bufsize])
        {
            bufline[j] = newLine;
            nextColDiff = columnDiff + bufcolumn[k] - bufcolumn[j];
            bufcolumn[j] = newCol + columnDiff;
            columnDiff = nextColDiff;
            i++;
        }

        if (i < len)
        {
            bufline[j] = newLine++;
            bufcolumn[j] = newCol + columnDiff;

            while (i++ < len)
            {
                if (bufline[j = start % bufsize] != bufline[++start % bufsize])
                {
                    bufline[j] = newLine++;
                }
                else
                {
                    bufline[j] = newLine;
                }
            }
        }

        line = bufline[j];
        column = bufcolumn[j];
    }

}