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

 /*

  * Copyright (c) 2008, 2009, Oracle and/or its affiliates. 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.  Oracle designates this

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

  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  */

 package com.sun.tools.javac.util;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.EnumSet;

 import java.util.HashMap;

 import java.util.Locale;

 import java.util.Map;

 import java.util.Set;

 import javax.tools.JavaFileObject;

 import com.sun.tools.javac.api.DiagnosticFormatter;

 import com.sun.tools.javac.api.DiagnosticFormatter.Configuration.DiagnosticPart;

 import com.sun.tools.javac.api.DiagnosticFormatter.Configuration.MultilineLimit;

 import com.sun.tools.javac.api.DiagnosticFormatter.PositionKind;

 import com.sun.tools.javac.api.Formattable;

 import com.sun.tools.javac.code.Printer;

 import com.sun.tools.javac.code.Symbol;

 import com.sun.tools.javac.code.Type;

 import com.sun.tools.javac.code.Type.CapturedType;

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

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

 /**

  * This abstract class provides a basic implementation of the functionalities that should be provided

  * by any formatter used by javac. Among the main features provided by AbstractDiagnosticFormatter are:

  *

  * <ul>

  *  <li> Provides a standard implementation of the visitor-like methods defined in the interface DiagnisticFormatter.

  *  Those implementations are specifically targeting JCDiagnostic objects.

  *  <li> Provides basic support for i18n and a method for executing all locale-dependent conversions

  *  <li> Provides the formatting logic for rendering the arguments of a JCDiagnostic object.

  * <ul>

  *

  * <p><b>This is NOT part of any supported API.

  * 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 abstract class AbstractDiagnosticFormatter implements DiagnosticFormatter<JCDiagnostic> {

     /**

      * JavacMessages object used by this formatter for i18n.

      */

     protected JavacMessages messages;

     /**

      * Configuration object used by this formatter

      */

     private SimpleConfiguration config;

     /**

      * Current depth level of the disgnostic being formatted

      * (!= 0 for subdiagnostics)

      */

     protected int depth = 0;

     /**

      * All captured types that have been encountered during diagnostic formatting.

      * This info is used by the FormatterPrinter in order to print friendly unique

      * ids for captured types

      */

     private List<Type> allCaptured = List.nil();

     /**

      * Initialize an AbstractDiagnosticFormatter by setting its JavacMessages object.

      * @param messages

      */

     protected AbstractDiagnosticFormatter(JavacMessages messages, SimpleConfiguration config) {

         this.messages = messages;

         this.config = config;

     }

     public String formatKind(JCDiagnostic d, Locale l) {

         switch (d.getType()) {

             case FRAGMENT: return "";

             case NOTE:     return localize(l, "compiler.note.note");

             case WARNING:  return localize(l, "compiler.warn.warning");

             case ERROR:    return localize(l, "compiler.err.error");

             default:

                 throw new AssertionError("Unknown diagnostic type: " + d.getType());

         }

     }

     @Override

     public String format(JCDiagnostic d, Locale locale) {

         allCaptured = List.nil();

         return formatDiagnostic(d, locale);

     }

     protected abstract String formatDiagnostic(JCDiagnostic d, Locale locale);

     public String formatPosition(JCDiagnostic d, PositionKind pk,Locale l) {

         assert (d.getPosition() != Position.NOPOS);

         return String.valueOf(getPosition(d, pk));

     }

     //where

     private long getPosition(JCDiagnostic d, PositionKind pk) {

         switch (pk) {

             case START: return d.getIntStartPosition();

             case END: return d.getIntEndPosition();

             case LINE: return d.getLineNumber();

             case COLUMN: return d.getColumnNumber();

             case OFFSET: return d.getIntPosition();

             default:

                 throw new AssertionError("Unknown diagnostic position: " + pk);

         }

     }

     public String formatSource(JCDiagnostic d, boolean fullname, Locale l) {

         JavaFileObject fo = d.getSource();

         if (fo == null)

             throw new IllegalArgumentException(); // d should have source set

         if (fullname)

             return fo.getName();

         else if (fo instanceof BaseFileObject)

             return ((BaseFileObject) fo).getShortName();

         else

             return BaseFileObject.getSimpleName(fo);

     }

     /**

      * Format the arguments of a given diagnostic.

      *

      * @param d diagnostic whose arguments are to be formatted

      * @param l locale object to be used for i18n

      * @return a Collection whose elements are the formatted arguments of the diagnostic

      */

     protected Collection<String> formatArguments(JCDiagnostic d, Locale l) {

         ListBuffer<String> buf = new ListBuffer<String>();

         for (Object o : d.getArgs()) {

            buf.append(formatArgument(d, o, l));

         }

         return buf.toList();

     }

     /**

      * Format a single argument of a given diagnostic.

      *

      * @param d diagnostic whose argument is to be formatted

      * @param arg argument to be formatted

      * @param l locale object to be used for i18n

      * @return string representation of the diagnostic argument

      */

     protected String formatArgument(JCDiagnostic d, Object arg, Locale l) {

         if (arg instanceof JCDiagnostic) {

             String s = null;

             depth++;

             try {

                 s = formatMessage((JCDiagnostic)arg, l);

             }

             finally {

                 depth--;

             }

             return s;

         }

         else if (arg instanceof Iterable<?>) {

             return formatIterable(d, (Iterable<?>)arg, l);

         }

         else if (arg instanceof Type) {

             return printer.visit((Type)arg, l);

         }

         else if (arg instanceof Symbol) {

             return printer.visit((Symbol)arg, l);

         }

         else if (arg instanceof JavaFileObject) {

             return ((JavaFileObject)arg).getName();

         }

         else if (arg instanceof Formattable) {

             return ((Formattable)arg).toString(l, messages);

         }

         else {

             return String.valueOf(arg);

         }

     }

     /**

      * Format an iterable argument of a given diagnostic.

      *

      * @param d diagnostic whose argument is to be formatted

      * @param it iterable argument to be formatted

      * @param l locale object to be used for i18n

      * @return string representation of the diagnostic iterable argument

      */

     protected String formatIterable(JCDiagnostic d, Iterable<?> it, Locale l) {

         StringBuilder sbuf = new StringBuilder();

         String sep = "";

         for (Object o : it) {

             sbuf.append(sep);

             sbuf.append(formatArgument(d, o, l));

             sep = ",";

         }

         return sbuf.toString();

     }

     /**

      * Format all the subdiagnostics attached to a given diagnostic.

      *

      * @param d diagnostic whose subdiagnostics are to be formatted

      * @param l locale object to be used for i18n

      * @return list of all string representations of the subdiagnostics

      */

     protected List<String> formatSubdiagnostics(JCDiagnostic d, Locale l) {

         List<String> subdiagnostics = List.nil();

         int maxDepth = config.getMultilineLimit(MultilineLimit.DEPTH);

         if (maxDepth == -1 || depth < maxDepth) {

             depth++;

             try {

                 int maxCount = config.getMultilineLimit(MultilineLimit.LENGTH);

                 int count = 0;

                 for (JCDiagnostic d2 : d.getSubdiagnostics()) {

                     if (maxCount == -1 || count < maxCount) {

                         subdiagnostics = subdiagnostics.append(formatSubdiagnostic(d, d2, l));

                         count++;

                     }

                     else

                         break;

                 }

             }

             finally {

                 depth--;

             }

         }

         return subdiagnostics;

     }

     /**

      * Format a subdiagnostics attached to a given diagnostic.

      *

      * @param parent multiline diagnostic whose subdiagnostics is to be formatted

      * @param sub subdiagnostic to be formatted

      * @param l locale object to be used for i18n

      * @return string representation of the subdiagnostics

      */

     protected String formatSubdiagnostic(JCDiagnostic parent, JCDiagnostic sub, Locale l) {

         return formatMessage(sub, l);

     }

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

      *  @param d The diagnostic for which the error line should be printed

      */

     protected String formatSourceLine(JCDiagnostic d, int nSpaces) {

         StringBuilder buf = new StringBuilder();

         DiagnosticSource source = d.getDiagnosticSource();

         int pos = d.getIntPosition();

         if (d.getIntPosition() == Position.NOPOS)

             throw new AssertionError();

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

         if (line == null)

             return "";

         buf.append(indent(line, nSpaces));

         int col = source.getColumnNumber(pos, false);

         if (config.isCaretEnabled()) {

             buf.append("\n");

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

                 buf.append((line.charAt(i) == '\t') ? "\t" : " ");

             }

             buf.append(indent("^", nSpaces));

         }

         return buf.toString();

     }

     /**

      * Converts a String into a locale-dependent representation accordingly to a given locale.

      *

      * @param l locale object to be used for i18n

      * @param key locale-independent key used for looking up in a resource file

      * @param args localization arguments

      * @return a locale-dependent string

      */

     protected String localize(Locale l, String key, Object... args) {

         return messages.getLocalizedString(l, key, args);

     }

     public boolean displaySource(JCDiagnostic d) {

         return config.getVisible().contains(DiagnosticPart.SOURCE) &&

                 d.getType() != FRAGMENT &&

                 d.getIntPosition() != Position.NOPOS;

     }

     public boolean isRaw() {

         return false;

     }

     /**

      * Creates a string with a given amount of empty spaces. Useful for

      * indenting the text of a diagnostic message.

      *

      * @param nSpaces the amount of spaces to be added to the result string

      * @return the indentation string

      */

     protected String indentString(int nSpaces) {

         String spaces = "                        ";

         if (nSpaces <= spaces.length())

             return spaces.substring(0, nSpaces);

         else {

             StringBuilder buf = new StringBuilder();

             for (int i = 0 ; i < nSpaces ; i++)

                 buf.append(" ");

             return buf.toString();

         }

     }

     /**

      * Indent a string by prepending a given amount of empty spaces to each line

      * of the string.

      *

      * @param s the string to be indented

      * @param nSpaces the amount of spaces that should be prepended to each line

      * of the string

      * @return an indented string

      */

     protected String indent(String s, int nSpaces) {

         String indent = indentString(nSpaces);

         StringBuilder buf = new StringBuilder();

         String nl = "";

         for (String line : s.split("\n")) {

             buf.append(nl);

             buf.append(indent + line);

             nl = "\n";

         }

         return buf.toString();

     }

     public SimpleConfiguration getConfiguration() {

         return config;

     }

     static public class SimpleConfiguration implements Configuration {

         protected Map<MultilineLimit, Integer> multilineLimits;

         protected EnumSet<DiagnosticPart> visibleParts;

         protected boolean caretEnabled;

         public SimpleConfiguration(Set<DiagnosticPart> parts) {

             multilineLimits = new HashMap<MultilineLimit, Integer>();

             setVisible(parts);

             setMultilineLimit(MultilineLimit.DEPTH, -1);

             setMultilineLimit(MultilineLimit.LENGTH, -1);

             setCaretEnabled(true);

         }

         @SuppressWarnings("fallthrough")

         public SimpleConfiguration(Options options, Set<DiagnosticPart> parts) {

             this(parts);

             String showSource = null;

             if ((showSource = options.get("showSource")) != null) {

                 if (showSource.equals("true"))

                     setVisiblePart(DiagnosticPart.SOURCE, true);

                 else if (showSource.equals("false"))

                     setVisiblePart(DiagnosticPart.SOURCE, false);

             }

             String diagOpts = options.get("diags");

             if (diagOpts != null) {//override -XDshowSource

                 Collection<String> args = Arrays.asList(diagOpts.split(","));

                 if (args.contains("short")) {

                     setVisiblePart(DiagnosticPart.DETAILS, false);

                     setVisiblePart(DiagnosticPart.SUBDIAGNOSTICS, false);

                 }

                 if (args.contains("source"))

                     setVisiblePart(DiagnosticPart.SOURCE, true);

                 if (args.contains("-source"))

                     setVisiblePart(DiagnosticPart.SOURCE, false);

             }

             String multiPolicy = null;

             if ((multiPolicy = options.get("multilinePolicy")) != null) {

                 if (multiPolicy.equals("disabled"))

                     setVisiblePart(DiagnosticPart.SUBDIAGNOSTICS, false);

                 else if (multiPolicy.startsWith("limit:")) {

                     String limitString = multiPolicy.substring("limit:".length());

                     String[] limits = limitString.split(":");

                     try {

                         switch (limits.length) {

                             case 2: {

                                 if (!limits[1].equals("*"))

                                     setMultilineLimit(MultilineLimit.DEPTH, Integer.parseInt(limits[1]));

                             }

                             case 1: {

                                 if (!limits[0].equals("*"))

                                     setMultilineLimit(MultilineLimit.LENGTH, Integer.parseInt(limits[0]));

                             }

                         }

                     }

                     catch(NumberFormatException ex) {

                         setMultilineLimit(MultilineLimit.DEPTH, -1);

                         setMultilineLimit(MultilineLimit.LENGTH, -1);

                     }

                 }

             }

             String showCaret = null;

             if (((showCaret = options.get("showCaret")) != null) &&

                 showCaret.equals("false"))

                     setCaretEnabled(false);

             else

                 setCaretEnabled(true);

         }

         public int getMultilineLimit(MultilineLimit limit) {

             return multilineLimits.get(limit);

         }

         public EnumSet<DiagnosticPart> getVisible() {

             return EnumSet.copyOf(visibleParts);

         }

         public void setMultilineLimit(MultilineLimit limit, int value) {

             multilineLimits.put(limit, value < -1 ? -1 : value);

         }

         public void setVisible(Set<DiagnosticPart> diagParts) {

             visibleParts = EnumSet.copyOf(diagParts);

         }

         public void setVisiblePart(DiagnosticPart diagParts, boolean enabled) {

             if (enabled)

                 visibleParts.add(diagParts);

             else

                 visibleParts.remove(diagParts);

         }

         /**

          * Shows a '^' sign under the source line displayed by the formatter

          * (if applicable).

          *

          * @param caretEnabled if true enables caret

          */

         public void setCaretEnabled(boolean caretEnabled) {

             this.caretEnabled = caretEnabled;

         }

         /**

          * Tells whether the caret display is active or not.

          *

          * @param caretEnabled if true the caret is enabled

          */

         public boolean isCaretEnabled() {

             return caretEnabled;

         }

     }

     public Printer getPrinter() {

         return printer;

     }

     public void setPrinter(Printer printer) {

         this.printer = printer;

     }

     /**

      * An enhanced printer for formatting types/symbols used by

      * AbstractDiagnosticFormatter. Provides alternate numbering of captured

      * types (they are numbered starting from 1 on each new diagnostic, instead

      * of relying on the underlying hashcode() method which generates unstable

      * output). Also detects cycles in wildcard messages (e.g. if the wildcard

      * type referred by a given captured type C contains C itself) which might

      * lead to infinite loops.

      */

     protected Printer printer = new Printer() {

         @Override

         protected String localize(Locale locale, String key, Object... args) {

             return AbstractDiagnosticFormatter.this.localize(locale, key, args);

         }

         @Override

         protected String capturedVarId(CapturedType t, Locale locale) {

             return "" + (allCaptured.indexOf(t) + 1);

         }

         @Override

         public String visitCapturedType(CapturedType t, Locale locale) {

             if (!allCaptured.contains(t)) {

                 allCaptured = allCaptured.append(t);

             }

             return super.visitCapturedType(t, locale);

         }

     };

 }