BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
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.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2004 Jan Arne Petersen 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * 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.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2004 Jan Arne Petersen <jpetersen@uni-bonn.de>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.common;

import java.util.EnumSet;
import java.util.Set;
import org.joni.WarnCallback;
import org.jruby.Ruby;
import org.jruby.RubyModule;
import org.jruby.RubyString;
import org.jruby.anno.JRubyMethod;
import org.jruby.lexer.yacc.ISourcePosition;
import org.jruby.runtime.JavaSites;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.backtrace.RubyStackTraceElement;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.TypeConverter;

/**
 *
 */
public class RubyWarnings implements IRubyWarnings, WarnCallback {
    private final Ruby runtime;
    private final Set<ID> oncelers = EnumSet.allOf(IRubyWarnings.ID.class);

    public RubyWarnings(Ruby runtime) {
        this.runtime = runtime;
    }

    public static RubyModule createWarningModule(Ruby runtime) {
        RubyModule warning = runtime.defineModule("Warning");

        warning.defineAnnotatedMethods(RubyWarnings.class);
        warning.extend_object(warning);

        return warning;
    }

    @Override
    public void warn(String message) {
        warn(ID.MISCELLANEOUS, message);
    }

    @Override
    public Ruby getRuntime() {
        return runtime;
    }

    @Override
    public boolean isVerbose() {
        return runtime.isVerbose();
    }

    
Prints a warning, unless $VERBOSE is nil.
/**
     * Prints a warning, unless $VERBOSE is nil.
     */
    @Override
    @Deprecated
    public void warn(ID id, ISourcePosition position, String message) {
        if (!runtime.warningsEnabled()) return;

        warn(id, position.getFile(), position.getLine(), message);
    }

    
Prints a warning, unless $VERBOSE is nil.
/**
     * Prints a warning, unless $VERBOSE is nil.
     */
    @Override
    public void warn(ID id, String fileName, int lineNumber, String message) {
        if (!runtime.warningsEnabled()) return;

        StringBuilder buffer = new StringBuilder(100);

        buffer.append(fileName).append(':').append(lineNumber + 1).append(": ");
        buffer.append("warning: ").append(message).append('\n');
        RubyString errorString = runtime.newString(buffer.toString());

        writeWarningDyncall(runtime.getCurrentContext(), errorString);
    }

    // MRI: rb_write_warning_str
    public static void writeWarningDyncall(ThreadContext context, RubyString errorString) {
        RubyModule warning = context.runtime.getWarning();

        sites(context).warn.call(context, warning, warning, errorString);
    }

    // MR: rb_write_error_str
    public static void writeWarningToError(ThreadContext context, RubyString errorString) {
        Ruby runtime = context.runtime;

        IRubyObject errorStream = runtime.getGlobalVariables().get("$stderr");
        RubyModule warning = runtime.getWarning();

        sites(context).write.call(context, warning, errorStream, errorString);
    }

    @Override
    public void warn(ID id, String message) {
        if (!runtime.warningsEnabled()) return;

        RubyStackTraceElement stack = runtime.getCurrentContext().getSingleBacktrace();
        String file;
        int line;

        if (stack == null) {
            file = "(unknown)";
            line = 0;
        } else {
            file = stack.getFileName();
            line = stack.getLineNumber();
        }

        // 1 is subtracted here because getRubyStackTrace is 1-indexed.
        warn(id, file, line - 1, message);
    }

    public void warn(String filename, String message) {
        if (!runtime.warningsEnabled()) return;

        StringBuilder buffer = new StringBuilder(100);

        buffer.append(filename).append(": ").append(message).append('\n');
        RubyString errorString = runtime.newString(buffer.toString());

        writeWarningDyncall(runtime.getCurrentContext(), errorString);
    }

    public void warnOnce(ID id, String message) {
        if (!runtime.warningsEnabled()) return;
        if (oncelers.contains(id)) return;

        oncelers.add(id);
        warn(id, message);
    }

    
Verbose mode warning methods, their contract is that consumer must explicitly check for runtime.isVerbose()
before calling them
/**
     * Verbose mode warning methods, their contract is that consumer must explicitly check for runtime.isVerbose()
     * before calling them
     */
    public void warning(String message) {
        if (!isVerbose()) return;
        if (!runtime.warningsEnabled()) return;

        warning(ID.MISCELLANEOUS, message);
    }

    @Override
    public void warning(ID id, String message) {
        if (!runtime.warningsEnabled() || !runtime.isVerbose()) return;

        writeWarning(runtime, id, message);
    }

    private static void writeWarning(Ruby runtime, ID id, String message) {
        RubyStackTraceElement stack = runtime.getCurrentContext().getSingleBacktrace();
        String file;
        int line;

        if (stack == null) {
            file = "(unknown)";
            line = -1;
        } else {
            file = stack.getFileName();
            line = stack.getLineNumber();
        }

        runtime.getWarnings().warning(id, file, line, message);
    }

    
Prints a warning, only in verbose mode.
/**
     * Prints a warning, only in verbose mode.
     */
    @Override
    @Deprecated
    public void warning(ID id, ISourcePosition position, String message) {
        warning(id, position.getFile(), position.getLine(), message);
    }

    
Prints a warning, only in verbose mode.
/**
     * Prints a warning, only in verbose mode.
     */
    @Override
    public void warning(ID id, String fileName, int lineNumber, String message) {
        if (!runtime.warningsEnabled() || !runtime.isVerbose()) return;

        warn(id, fileName, lineNumber, message);
    }

    @JRubyMethod
    public static IRubyObject warn(ThreadContext context, IRubyObject recv, IRubyObject arg) {
        Ruby runtime = context.runtime;

        if (!runtime.warningsEnabled()) return context.nil;

        TypeConverter.checkType(context, arg, runtime.getString());
        RubyString str = (RubyString) arg;
        if (!str.getEncoding().isAsciiCompatible()) {
            throw runtime.newEncodingCompatibilityError("ASCII incompatible encoding: " + str.getEncoding());
        }
        writeWarningToError(runtime.getCurrentContext(), str);
        return context.nil;
    }

    private static JavaSites.WarningSites sites(ThreadContext context) {
        return context.sites.Warning;
    }

    
Prints a warning, unless $VERBOSE is nil.
/**
     * Prints a warning, unless $VERBOSE is nil.
     */
    @Override
    @Deprecated
    public void warn(ID id, String fileName, String message) {
        if (!runtime.warningsEnabled()) return;

        StringBuilder buffer = new StringBuilder(100);

        buffer.append(fileName).append(' ');
        buffer.append("warning: ").append(message).append('\n');
        IRubyObject errorStream = runtime.getGlobalVariables().get("$stderr");
        errorStream.callMethod(runtime.getCurrentContext(), "write", runtime.newString(buffer.toString()));
    }
}