/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 4.0 */
package org.trix.cuery.parser;

/**
 * An implementation of interface CharStream, where the stream is assumed to contain only ASCII
 * characters (with java-like unicode escape processing).
 */

public class JavaCharStream {

    public static final boolean staticFlag = false;

    static final int hexval(char c) throws java.io.IOException {
        switch (c) {
        case '0':
            return 0;
        case '1':
            return 1;
        case '2':
            return 2;
        case '3':
            return 3;
        case '4':
            return 4;
        case '5':
            return 5;
        case '6':
            return 6;
        case '7':
            return 7;
        case '8':
            return 8;
        case '9':
            return 9;

        case 'a':
        case 'A':
            return 10;
        case 'b':
        case 'B':
            return 11;
        case 'c':
        case 'C':
            return 12;
        case 'd':
        case 'D':
            return 13;
        case 'e':
        case 'E':
            return 14;
        case 'f':
        case 'F':
            return 15;
        }

        throw new java.io.IOException(); // Should never come here
    }

    public int bufpos = -1;

    int bufsize;

    int available;

    int tokenBegin;

    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[] nextCharBuf;

    protected char[] buffer;

    protected int maxNextCharInd = 0;

    protected int nextCharInd = -1;

    protected int inBuf = 0;

    protected int tabSize = 8;

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

    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;

                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;

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

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

    protected void FillBuff() throws java.io.IOException {
        int i;
        if (maxNextCharInd == 4096) maxNextCharInd = nextCharInd = 0;

        try {
            if ((i = inputStream.read(nextCharBuf, maxNextCharInd, 4096 - maxNextCharInd)) == -1) {
                inputStream.close();
                throw new java.io.IOException();
            } else
                maxNextCharInd += i;
            return;
        } catch (java.io.IOException e) {
            if (bufpos != 0) {
                --bufpos;
                backup(0);
            } else {
                bufline[bufpos] = line;
                bufcolumn[bufpos] = column;
            }
            throw e;
        }
    }

    protected char ReadByte() throws java.io.IOException {
        if (++nextCharInd >= maxNextCharInd) FillBuff();

        return nextCharBuf[nextCharInd];
    }

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

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

            tokenBegin = bufpos;
            return buffer[bufpos];
        }

        tokenBegin = 0;
        bufpos = -1;

        return readChar();
    }

    protected void AdjustBuffSize() {
        if (available == bufsize) {
            if (tokenBegin > 2048) {
                bufpos = 0;
                available = tokenBegin;
            } else
                ExpandBuff(false);
        } else if (available > tokenBegin)
            available = bufsize;
        else if ((tokenBegin - available) < 2048)
            ExpandBuff(true);
        else
            available = tokenBegin;
    }

    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];
        }

        char c;

        if (++bufpos == available) AdjustBuffSize();

        if ((buffer[bufpos] = c = ReadByte()) == '\\') {
            UpdateLineColumn(c);

            int backSlashCnt = 1;

            for (;;) // Read all the backslashes
            {
                if (++bufpos == available) AdjustBuffSize();

                try {
                    if ((buffer[bufpos] = c = ReadByte()) != '\\') {
                        UpdateLineColumn(c);
                        // found a non-backslash char.
                        if ((c == 'u') && ((backSlashCnt & 1) == 1)) {
                            if (--bufpos < 0) bufpos = bufsize - 1;

                            break;
                        }

                        backup(backSlashCnt);
                        return '\\';
                    }
                } catch (java.io.IOException e) {
                    if (backSlashCnt > 1) backup(backSlashCnt);

                    return '\\';
                }

                UpdateLineColumn(c);
                backSlashCnt++;
            }

            // Here, we have seen an odd number of backslash's followed by a 'u'
            try {
                while ((c = ReadByte()) == 'u')
                    ++column;

                buffer[bufpos] = c = (char) (hexval(c) << 12 | hexval(ReadByte()) << 8 | hexval(ReadByte()) << 4 | hexval(ReadByte()));

                column += 4;
            } catch (java.io.IOException e) {
                throw new Error("Invalid escape character at line " + line + " column " + column + ".");
            }

            if (backSlashCnt == 1)
                return c;
            else {
                backup(backSlashCnt - 1);
                return '\\';
            }
        } else {
            UpdateLineColumn(c);
            return (c);
        }
    }

    /**
     * @deprecated
     * @see #getEndColumn
     */

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

    /**
     * @deprecated
     * @see #getEndLine
     */

    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 JavaCharStream(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];
        nextCharBuf = new char[4096];
    }

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

    public JavaCharStream(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];
            nextCharBuf = new char[4096];
        }
        prevCharIsLF = prevCharIsCR = false;
        tokenBegin = inBuf = maxNextCharInd = 0;
        nextCharInd = 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 JavaCharStream(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 JavaCharStream(java.io.InputStream dstream, int startline, int startcolumn, int buffersize) {
        this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
    }

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

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

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

    public JavaCharStream(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, 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 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 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() {
        nextCharBuf = null;
        buffer = null;
        bufline = null;
        bufcolumn = null;
    }

    /**
     * Method to adjust line and column numbers for the start of a token.
     */
    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];
    }

}
