All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.cayenne.exp.parser.JavaCharStream Maven / Gradle / Ivy

There is a newer version: 2.0.4
Show newest version
/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 3.0 */
/*****************************************************************
 *   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.cayenne.exp.parser;

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

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 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 += (8 - (column & 07));
                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,
        int startline,
        int startcolumn,
        int buffersize) {
        this(new java.io.InputStreamReader(dstream), startline, startcolumn, 4096);
    }

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

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

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

}




© 2015 - 2024 Weber Informatics LLC | Privacy Policy