bsh.JavaCharStream Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aibench-shell Show documentation
The newest version!
/*
 * #%L
 * The AIBench Shell Plugin
 * %%
 * Copyright (C) 2006 - 2017 Daniel Glez-Peña and Florentino Fdez-Riverola
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 * #L%
 */
/* Generated By:JavaCC: Do not edit this line. JavaCharStream.java Version 3.0 */
package bsh;

/**
 * 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 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);
		}
	}

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

	/**
	 * 
	 * @return the line.
	 * @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.

	 * 
	 * @param newLine
	 *            the new line value.
	 * @param newCol
	 *            the new column value.
	 */
	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];
	}

}