/* Generated By:JavaCC: Do not edit this line. SimpleCharStream.java Version 5.0 */
/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */
/*
 Copyright (c) 1998-2009 The Regents of the University of California.
 All rights reserved.
 Permission is hereby granted, without written agreement and without
 license or royalty fees, to use, copy, modify, and distribute this
 software and its documentation for any purpose, provided that the above
 copyright notice and the following two paragraphs appear in all copies
 of this software.

 IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.

 THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 ENHANCEMENTS, OR MODIFICATIONS.

                                        PT_COPYRIGHT_VERSION_2
                                        COPYRIGHTENDKEY

Created : May 1998
 */

package ptolemy.data.expr;

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

public class SimpleCharStream {
    /** Whether parser is static. */
    public static final boolean staticFlag = false;
    int bufsize;
    int available;
    int tokenBegin;
    /** Position in buffer. */
    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;
    }

    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;
        }
    }

    /** Start. */
    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;
    }

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

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

    /** Get token end column number. */
    public int getEndColumn() {
        return bufcolumn[bufpos];
    }

    /** Get token end line number. */
    public int getEndLine() {
        return bufline[bufpos];
    }

    /** Get token beginning column number. */
    public int getBeginColumn() {
        return bufcolumn[tokenBegin];
    }

    /** Get token beginning line number. */
    public int getBeginLine() {
        return bufline[tokenBegin];
    }

    /** Backup a number of characters. */
    public void backup(int amount) {

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

    /** Constructor. */
    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];
    }

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

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

    /** Reinitialise. */
    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;
    }

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

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

    /** Constructor. */
    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);
    }

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

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

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

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

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

    /** Reinitialise. */
    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);
    }

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

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

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

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

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

    /** Get token literal value. */
    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);
        }
    }

    /** Get the suffix. */
    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;
    }

    /** Reset buffer when finished. */
    public void Done() {
        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];
    }

}
/* JavaCC - OriginalChecksum=7cd8a7b403c0eb6e4a2ab3acab01887d (do not edit this line) */