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/* Generated By:JavaCC: Do not edit this line. ParseException.java Version 6.1 */
/* JavaCCOptions:KEEP_LINE_COLUMN=true */
package com.google.common.css.compiler.ast;

import static com.google.common.css.compiler.ast.EscapeUtil.addEscapes;

/**
 * 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 {

    /**
     * The version identifier for this Serializable class.
     * Increment only if the serialized form of the
     * class changes.
     */
    private static final long serialVersionUID = 1L;

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

    /**
     * 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.
     */
    public ParseException(Token currentTokenVal,
                          int[][] expectedTokenSequencesVal,
                          String[] tokenImageVal
    ) {
        super(initialise(currentTokenVal, expectedTokenSequencesVal, tokenImageVal));
        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();
    }

    /**
     * Constructor with message.
     */
    public ParseException(String message) {
        super(message);
    }


    /**
     * 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;

    /**
     * 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) the correct error message
     * gets displayed.
     */
    private static String initialise(Token currentToken,
                                     int[][] expectedTokenSequences,
                                     String[] tokenImage) {

        StringBuilder expected = new StringBuilder();
        int maxSize = 0;
        for (int[] expectedTokenSequence : expectedTokenSequences) {
            if (maxSize < expectedTokenSequence.length) {
                maxSize = expectedTokenSequence.length;
            }
            for (int i : expectedTokenSequence) {
                expected.append(tokenImage[i]).append(' ');
            }
            if (expectedTokenSequence[expectedTokenSequence.length - 1] != 0) {
                expected.append("...");
            }
            expected.append(EOL).append("    ");
        }
        StringBuilder retval = new StringBuilder("Encountered \"");
        Token tok = currentToken.next;
        for (int i = 0; i < maxSize; i++) {
            if (i != 0) retval.append(" ");
            if (tok.kind == 0) {
                retval.append(tokenImage[0]);
                break;
            }
            retval.append(" ").append(tokenImage[tok.kind]);
            retval.append(" \"");
            retval.append(addEscapes(tok.image));
            retval.append(" \"");
            tok = tok.next;
        }
        retval.append("\" at line ").append(currentToken.next.beginLine).append(", column ").append(currentToken.next.beginColumn);
        retval.append(".").append(EOL);


        if (expectedTokenSequences.length != 0) {
            if (expectedTokenSequences.length == 1) {
                retval.append("Was expecting:").append(EOL).append("    ");
            } else {
                retval.append("Was expecting one of:").append(EOL).append("    ");
            }
            retval.append(expected);
        }

        return retval.toString();
    }

}