bundles/org.eclipse.wst.jsdt.web.core/src/org/eclipse/wst/jsdt/web/core/internal/java/jspel/ParseException.java

/*******************************************************************************
 * Copyright (c) 2005 BEA Systems and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     BEA Systems - initial implementation
 *     
 *******************************************************************************/
/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 3.0 */
package org.eclipse.wst.jsdt.web.core.internal.java.jspel;

/**
 * This exception is thrown when parse errors are encountered. You can
 * explicitly create objects of this exception type by calling the method
 * generateParseException in the generated parser.
 * 
 * You can modify this class to customize your error reporting mechanisms so
 * long as you retain the public fields.
 */
public class ParseException extends Exception {

	/**
	 * Default <code>serialVersionUID</code>
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * This constructor is used by the method "generateParseException" in the
	 * generated parser. Calling this constructor generates a new object of this
	 * type with the fields "currentToken", "expectedTokenSequences", and
	 * "tokenImage" set. The boolean flag "specialConstructor" is also set to
	 * true to indicate that this constructor was used to create this object.
	 * This constructor calls its super class with the empty string to force the
	 * "toString" method of parent class "Throwable" to print the error message
	 * in the form: ParseException: <result of getMessage>
	 */
	public ParseException(Token currentTokenVal,
			int[][] expectedTokenSequencesVal, String[] tokenImageVal) {
		super("");
		specialConstructor = true;
		currentToken = currentTokenVal;
		expectedTokenSequences = expectedTokenSequencesVal;
		tokenImage = tokenImageVal;
	}

	/**
	 * The following constructors are for use by you for whatever purpose you
	 * can think of. Constructing the exception in this manner makes the
	 * exception behave in the normal way - i.e., as documented in the class
	 * "Throwable". The fields "errorToken", "expectedTokenSequences", and
	 * "tokenImage" do not contain relevant information. The JavaCC generated
	 * code does not use these constructors.
	 */

	public ParseException() {
		super();
		specialConstructor = false;
	}

	public ParseException(String message) {
		super(message);
		specialConstructor = false;
	}

	/**
	 * This variable determines which constructor was used to create this object
	 * and thereby affects the semantics of the "getMessage" method (see below).
	 */
	protected boolean specialConstructor;

	/**
	 * This is the last token that has been consumed successfully. If this
	 * object has been created due to a parse error, the token followng this
	 * token will (therefore) be the first error token.
	 */
	public Token currentToken;

	/**
	 * Each entry in this array is an array of integers. Each array of integers
	 * represents a sequence of tokens (by their ordinal values) that is
	 * expected at this point of the parse.
	 */
	public int[][] expectedTokenSequences;

	/**
	 * This is a reference to the "tokenImage" array of the generated parser
	 * within which the parse error occurred. This array is defined in the
	 * generated ...Constants interface.
	 */
	public String[] tokenImage;

	/**
	 * This method has the standard behavior when this object has been created
	 * using the standard constructors. Otherwise, it uses "currentToken" and
	 * "expectedTokenSequences" to generate a parse error message and returns
	 * it. If this object has been created due to a parse error, and you do not
	 * catch it (it gets thrown from the parser), then this method is called
	 * during the printing of the final stack trace, and hence the correct error
	 * message gets displayed.
	 */
	@Override
	public String getMessage() {
		if (!specialConstructor) {
			return super.getMessage();
		}
		String expected = "";
		int maxSize = 0;
		for (int i = 0; i < expectedTokenSequences.length; i++) {
			if (maxSize < expectedTokenSequences[i].length) {
				maxSize = expectedTokenSequences[i].length;
			}
			for (int j = 0; j < expectedTokenSequences[i].length; j++) {
				expected += tokenImage[expectedTokenSequences[i][j]] + " ";
			}
			if (expectedTokenSequences[i][expectedTokenSequences[i].length - 1] != 0) {
				expected += "...";
			}
			expected += eol + "    ";
		}
		String retval = "Encountered \"";
		Token tok = currentToken.next;
		for (int i = 0; i < maxSize; i++) {
			if (i != 0) {
				retval += " ";
			}
			if (tok.kind == 0) {
				retval += tokenImage[0];
				break;
			}
			retval += add_escapes(tok.image);
			tok = tok.next;
		}
		retval += "\" at line " + currentToken.next.beginLine + ", column "
				+ currentToken.next.beginColumn;
		retval += "." + eol;
		if (expectedTokenSequences.length == 1) {
			retval += "Was expecting:" + eol + "    ";
		} else {
			retval += "Was expecting one of:" + eol + "    ";
		}
		retval += expected;
		return retval;
	}

	/**
	 * The end of line string for this machine.
	 */
	protected String eol = System.getProperty("line.separator", "\n");

	/**
	 * Used to convert raw characters to their escaped version when these raw
	 * version cannot be used as part of an ASCII string literal.
	 */
	protected String add_escapes(String str) {
		StringBuffer retval = new StringBuffer();
		char ch;
		for (int i = 0; i < str.length(); i++) {
			switch (str.charAt(i)) {
			case 0:
				continue;
			case '\b':
				retval.append("\\b");
				continue;
			case '\t':
				retval.append("\\t");
				continue;
			case '\n':
				retval.append("\\n");
				continue;
			case '\f':
				retval.append("\\f");
				continue;
			case '\r':
				retval.append("\\r");
				continue;
			case '\"':
				retval.append("\\\"");
				continue;
			case '\'':
				retval.append("\\\'");
				continue;
			case '\\':
				retval.append("\\\\");
				continue;
			default:
				if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
					String s = "0000" + Integer.toString(ch, 16);
					retval.append("\\u"
							+ s.substring(s.length() - 4, s.length()));
				} else {
					retval.append(ch);
				}
				continue;
			}
		}
		return retval.toString();
	}

}