/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.ast;

import java.util.ArrayList;
import java.util.List;

import org.mozilla.javascript.EvaluatorException;

/**
 * An error reporter that gathers the errors and warnings for later display.
 * This a useful {@link org.mozilla.javascript.ErrorReporter} when the
 * {@link org.mozilla.javascript.CompilerEnvirons} is set to
 * ide-mode (for IDEs).
 *
 * @author Steve Yegge
 */
public class ErrorCollector implements IdeErrorReporter {

    private List<ParseProblem> errors = new ArrayList<ParseProblem>();

    /**
     * This is not called during AST generation.
     * {@link #warning(String,String,int,int)} is used instead.
     * @throws UnsupportedOperationException
     */
    @Override
    public void warning(String message, String sourceName, int line,
                        String lineSource, int lineOffset) {
        throw new UnsupportedOperationException();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void warning(String message, String sourceName, int offset, int length)
    {
        errors.add(new ParseProblem(ParseProblem.Type.Warning,
                                    message, sourceName,
                                    offset, length));
    }

    /**
     * This is not called during AST generation.
     * {@link #warning(String,String,int,int)} is used instead.
     * @throws UnsupportedOperationException
     */
    @Override
    public void error(String message, String sourceName, int line,
                      String lineSource, int lineOffset)
    {
        throw new UnsupportedOperationException();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void error(String message, String sourceName,
                      int fileOffset, int length)
    {
        errors.add(new ParseProblem(ParseProblem.Type.Error,
                                    message, sourceName,
                                    fileOffset, length));
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public EvaluatorException runtimeError(String message, String sourceName,
                                           int line, String lineSource,
                                           int lineOffset)
    {
        throw new UnsupportedOperationException();
    }

    /**
     * Returns the list of errors and warnings produced during parsing.
     */
    public List<ParseProblem> getErrors() {
        return errors;
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder(errors.size() * 100);
        for (ParseProblem pp : errors) {
            sb.append(pp.toString()).append("\n");
        }
        return sb.toString();
    }
}
