/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 7.0 */
/* JavaCCOptions:STATIC=false,SUPPORT_CLASS_VISIBILITY_PUBLIC=true */
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.tomcat.util.json;

/**
 * An implementation of interface CharStream, where the stream is assumed to contain only ASCII characters (with
 * java-like unicode escape processing).
 */
@SuppressWarnings("all") // Ignore warnings in generated code
public class JavaCharStream {
    /** Whether parser is static. */
    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
    }

    /** Position in buffer. */
    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 = 1;
    protected boolean trackLineColumn = true;

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

    public int getTabSize() {
        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];
    }

    /** @return starting character for token. */
    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;
    }

    /** Read a character. */
    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()) == '\\') {
            if (trackLineColumn) {
                UpdateLineColumn(c);
            }

            int backSlashCnt = 1;

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

                try {
                    if ((buffer[bufpos] = c = ReadByte()) != '\\') {
                        if (trackLineColumn) {
                            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) {
                    // We are returning one backslash so we should only backup (count-1)
                    if (backSlashCnt > 1) {
                        backup(backSlashCnt - 1);
                    }

                    return '\\';
                }

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

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

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

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

    /** @return column of token start */
    public int getBeginColumn() {
        return bufcolumn[tokenBegin];
    }

    /** @return line number of token start */
    public int getBeginLine() {
        return bufline[tokenBegin];
    }

    /** Retreat. */
    public void backup(int amount) {

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

    /** Constructor. */
    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];
    }

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

    /** Constructor. */
    public JavaCharStream(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];
            nextCharBuf = new char[4096];
        }
        prevCharIsLF = prevCharIsCR = false;
        tokenBegin = inBuf = maxNextCharInd = 0;
        nextCharInd = 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 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);
    }

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

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

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

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

    /** Constructor. */
    public JavaCharStream(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, 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);
    }

    /** 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);
    }

    /** @return token image as String */
    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);
        }
    }

    /** @return 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;
    }

    /** Set buffers back to null when finished. */
    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];
    }

    boolean getTrackLineColumn() {
        return trackLineColumn;
    }

    void setTrackLineColumn(boolean tlc) {
        trackLineColumn = tlc;
    }

}
/* JavaCC - OriginalChecksum=58f718af3466d6064ba0132bca4fbce2 (do not edit this line) */
