Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * Copyright 1999-2008 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.  Sun designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Sun in the LICENSE file that accompanied this code.

  *

  * This code 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 Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  */

 package com.sun.tools.javac.util;

 import java.io.*;

 import java.util.HashSet;

 import java.util.Map;

 import java.util.Set;

 import javax.tools.DiagnosticListener;

 import javax.tools.JavaFileObject;

 import com.sun.tools.javac.file.JavacFileManager;

 import com.sun.tools.javac.tree.JCTree;

 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;

 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;

 /** A class for error logs. Reports errors and warnings, and

  *  keeps track of error numbers and positions.

  *

  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If

  *  you write code that depends on this, you do so at your own risk.

  *  This code and its internal interfaces are subject to change or

  *  deletion without notice.</b>

  */

 public class Log extends AbstractLog {

     /** The context key for the log. */

     public static final Context.Key<Log> logKey

         = new Context.Key<Log>();

     /** The context key for the output PrintWriter. */

     public static final Context.Key<PrintWriter> outKey =

         new Context.Key<PrintWriter>();

     //@Deprecated

     public final PrintWriter errWriter;

     //@Deprecated

     public final PrintWriter warnWriter;

     //@Deprecated

     public final PrintWriter noticeWriter;

     /** The maximum number of errors/warnings that are reported.

      */

     public final int MaxErrors;

     public final int MaxWarnings;

     /** Whether or not to display the line of source containing a diagnostic.

      */

     private final boolean showSourceLine;

     /** Switch: prompt user on each error.

      */

     public boolean promptOnError;

     /** Switch: emit warning messages.

      */

     public boolean emitWarnings;

     /** Print stack trace on errors?

      */

     public boolean dumpOnError;

     /** Print multiple errors for same source locations.

      */

     public boolean multipleErrors;

     /**

      * Diagnostic listener, if provided through programmatic

      * interface to javac (JSR 199).

      */

     protected DiagnosticListener<? super JavaFileObject> diagListener;

     /**

      * Formatter for diagnostics

      */

     private DiagnosticFormatter diagFormatter;

     /** Construct a log with given I/O redirections.

      */

     @Deprecated

     protected Log(Context context, PrintWriter errWriter, PrintWriter warnWriter, PrintWriter noticeWriter) {

         super(JCDiagnostic.Factory.instance(context));

         context.put(logKey, this);

         this.errWriter = errWriter;

         this.warnWriter = warnWriter;

         this.noticeWriter = noticeWriter;

         Options options = Options.instance(context);

         this.dumpOnError = options.get("-doe") != null;

         this.promptOnError = options.get("-prompt") != null;

         this.emitWarnings = options.get("-Xlint:none") == null;

         this.MaxErrors = getIntOption(options, "-Xmaxerrs", 100);

         this.MaxWarnings = getIntOption(options, "-Xmaxwarns", 100);

         this.showSourceLine = options.get("rawDiagnostics") == null;

         this.diagFormatter = DiagnosticFormatter.instance(context);

         @SuppressWarnings("unchecked") // FIXME

         DiagnosticListener<? super JavaFileObject> diagListener =

             context.get(DiagnosticListener.class);

         this.diagListener = diagListener;

     }

     // where

         private int getIntOption(Options options, String optionName, int defaultValue) {

             String s = options.get(optionName);

             try {

                 if (s != null) return Integer.parseInt(s);

             } catch (NumberFormatException e) {

                 // silently ignore ill-formed numbers

             }

             return defaultValue;

         }

     /** The default writer for diagnostics

      */

     static final PrintWriter defaultWriter(Context context) {

         PrintWriter result = context.get(outKey);

         if (result == null)

             context.put(outKey, result = new PrintWriter(System.err));

         return result;

     }

     /** Construct a log with default settings.

      */

     protected Log(Context context) {

         this(context, defaultWriter(context));

     }

     /** Construct a log with all output redirected.

      */

     protected Log(Context context, PrintWriter defaultWriter) {

         this(context, defaultWriter, defaultWriter, defaultWriter);

     }

     /** Get the Log instance for this context. */

     public static Log instance(Context context) {

         Log instance = context.get(logKey);

         if (instance == null)

             instance = new Log(context);

         return instance;

     }

     /** The number of errors encountered so far.

      */

     public int nerrors = 0;

     /** The number of warnings encountered so far.

      */

     public int nwarnings = 0;

     /** A set of all errors generated so far. This is used to avoid printing an

      *  error message more than once. For each error, a pair consisting of the

      *  source file name and source code position of the error is added to the set.

      */

     private Set<Pair<JavaFileObject, Integer>> recorded = new HashSet<Pair<JavaFileObject,Integer>>();

     public boolean hasDiagnosticListener() {

         return diagListener != null;

     }

     public void setEndPosTable(JavaFileObject name, Map<JCTree, Integer> table) {

         name.getClass(); // null check

         getSource(name).setEndPosTable(table);

     }

     /** Return current source name.

      */

     public JavaFileObject currentSource() {

         return source == null ? null : source.getFile();

     }

     /** Flush the logs

      */

     public void flush() {

         errWriter.flush();

         warnWriter.flush();

         noticeWriter.flush();

     }

     /** Returns true if an error needs to be reported for a given

      * source name and pos.

      */

     protected boolean shouldReport(JavaFileObject file, int pos) {

         if (multipleErrors || file == null)

             return true;

         Pair<JavaFileObject,Integer> coords = new Pair<JavaFileObject,Integer>(file, pos);

         boolean shouldReport = !recorded.contains(coords);

         if (shouldReport)

             recorded.add(coords);

         return shouldReport;

     }

     /** Prompt user after an error.

      */

     public void prompt() {

         if (promptOnError) {

             System.err.println(getLocalizedString("resume.abort"));

             char ch;

             try {

                 while (true) {

                     switch (System.in.read()) {

                     case 'a': case 'A':

                         System.exit(-1);

                         return;

                     case 'r': case 'R':

                         return;

                     case 'x': case 'X':

                         throw new AssertionError("user abort");

                     default:

                     }

                 }

             } catch (IOException e) {}

         }

     }

     /** Print the faulty source code line and point to the error.

      *  @param pos   Buffer index of the error position, must be on current line

      */

     private void printErrLine(int pos, PrintWriter writer) {

         String line = (source == null ? null : source.getLine(pos));

         if (line == null)

             return;

         int col = source.getColumnNumber(pos);

         printLines(writer, line);

         for (int i = 0; i < col - 1; i++) {

             writer.print((line.charAt(i) == '\t') ? "\t" : " ");

         }

         writer.println("^");

         writer.flush();

     }

     /** Print the text of a message, translating newlines appropriately

      *  for the platform.

      */

     public static void printLines(PrintWriter writer, String msg) {

         int nl;

         while ((nl = msg.indexOf('\n')) != -1) {

             writer.println(msg.substring(0, nl));

             msg = msg.substring(nl+1);

         }

         if (msg.length() != 0) writer.println(msg);

     }

     protected void directError(String key, Object... args) {

         printLines(errWriter, getLocalizedString(key, args));

         errWriter.flush();

     }

     /** Report a warning that cannot be suppressed.

      *  @param pos    The source position at which to report the warning.

      *  @param key    The key for the localized warning message.

      *  @param args   Fields of the warning message.

      */

     public void strictWarning(DiagnosticPosition pos, String key, Object ... args) {

         writeDiagnostic(diags.warning(source, pos, key, args));

         nwarnings++;

     }

     /**

      * Common diagnostic handling.

      * The diagnostic is counted, and depending on the options and how many diagnostics have been

      * reported so far, the diagnostic may be handed off to writeDiagnostic.

      */

     public void report(JCDiagnostic diagnostic) {

         switch (diagnostic.getType()) {

         case FRAGMENT:

             throw new IllegalArgumentException();

         case NOTE:

             // Print out notes only when we are permitted to report warnings

             // Notes are only generated at the end of a compilation, so should be small

             // in number.

             if (emitWarnings || diagnostic.isMandatory()) {

                 writeDiagnostic(diagnostic);

             }

             break;

         case WARNING:

             if (emitWarnings || diagnostic.isMandatory()) {

                 if (nwarnings < MaxWarnings) {

                     writeDiagnostic(diagnostic);

                     nwarnings++;

                 }

             }

             break;

         case ERROR:

             if (nerrors < MaxErrors

                 && shouldReport(diagnostic.getSource(), diagnostic.getIntPosition())) {

                 writeDiagnostic(diagnostic);

                 nerrors++;

             }

             break;

         }

     }

     /**

      * Write out a diagnostic.

      */

     protected void writeDiagnostic(JCDiagnostic diag) {

         if (diagListener != null) {

             try {

                 diagListener.report(diag);

                 return;

             }

             catch (Throwable t) {

                 throw new ClientCodeException(t);

             }

         }

         PrintWriter writer = getWriterForDiagnosticType(diag.getType());

         printLines(writer, diagFormatter.format(diag));

         if (showSourceLine) {

             int pos = diag.getIntPosition();

             if (pos != Position.NOPOS) {

                 JavaFileObject prev = useSource(diag.getSource());

                 printErrLine(pos, writer);

                 useSource(prev);

             }

         }

         if (promptOnError) {

             switch (diag.getType()) {

             case ERROR:

             case WARNING:

                 prompt();

             }

         }

         if (dumpOnError)

             new RuntimeException().printStackTrace(writer);

         writer.flush();

     }

     @Deprecated

     protected PrintWriter getWriterForDiagnosticType(DiagnosticType dt) {

         switch (dt) {

         case FRAGMENT:

             throw new IllegalArgumentException();

         case NOTE:

             return noticeWriter;

         case WARNING:

             return warnWriter;

         case ERROR:

             return errWriter;

         default:

             throw new Error();

         }

     }

     /** Find a localized string in the resource bundle.

      *  @param key    The key for the localized string.

      *  @param args   Fields to substitute into the string.

      */

     public static String getLocalizedString(String key, Object ... args) {

         return Messages.getDefaultLocalizedString("compiler.misc." + key, args);

     }

 /***************************************************************************

  * raw error messages without internationalization; used for experimentation

  * and quick prototyping

  ***************************************************************************/

     /** print an error or warning message:

      */

     private void printRawError(int pos, String msg) {

         if (source == null || pos == Position.NOPOS) {

             printLines(errWriter, "error: " + msg);

         } else {

             int line = source.getLineNumber(pos);

             JavaFileObject file = currentSource();

             if (file != null)

                 printLines(errWriter,

                            JavacFileManager.getJavacFileName(file) + ":" +

                            line + ": " + msg);

             printErrLine(pos, errWriter);

         }

         errWriter.flush();

     }

     /** report an error:

      */

     public void rawError(int pos, String msg) {

         if (nerrors < MaxErrors && shouldReport(currentSource(), pos)) {

             printRawError(pos, msg);

             prompt();

             nerrors++;

         }

         errWriter.flush();

     }

     /** report a warning:

      */

     public void rawWarning(int pos, String msg) {

         if (nwarnings < MaxWarnings && emitWarnings) {

             printRawError(pos, "warning: " + msg);

         }

         prompt();

         nwarnings++;

         errWriter.flush();

     }

     public static String format(String fmt, Object... args) {

         return String.format((java.util.Locale)null, fmt, args);

     }

 }