--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/langtools/src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java Tue Jul 15 09:50:36 2008 -0700
@@ -0,0 +1,214 @@
+/*
+ * 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.IOException;
+import java.lang.ref.SoftReference;
+import java.nio.CharBuffer;
+import java.util.Map;
+import javax.tools.JavaFileObject;
+
+import com.sun.tools.javac.file.JavacFileManager;
+import com.sun.tools.javac.tree.JCTree;
+
+import static com.sun.tools.javac.util.LayoutCharacters.*;
+
+/**
+ * A simple abstraction of a source file, as needed for use in a diagnostic message.
+ * Provides access to the line and position in a line for any given character offset.
+ *
+ * <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 DiagnosticSource {
+ public DiagnosticSource(JavaFileObject fo, AbstractLog log) {
+ this.fileObject = fo;
+ this.log = log;
+ }
+
+ /** Return the underlying file object handled by this
+ * DiagnosticSource object.
+ */
+ public JavaFileObject getFile() {
+ return fileObject;
+ }
+
+ public CharSequence getName() {
+ return JavacFileManager.getJavacBaseFileName(fileObject);
+ }
+
+ /** Return the one-based line number associated with a given pos
+ * for the current source file. Zero is returned if no line exists
+ * for the given position.
+ */
+ public int getLineNumber(int pos) {
+ try {
+ if (findLine(pos)) {
+ return line;
+ }
+ return 0;
+ } finally {
+ buf = null;
+ }
+ }
+
+ /** Return the one-based column number associated with a given pos
+ * for the current source file. Zero is returned if no column exists
+ * for the given position.
+ */
+ public int getColumnNumber(int pos) {
+ try {
+ if (findLine(pos)) {
+ int column = 0;
+ for (int bp = lineStart; bp < pos; bp++) {
+ if (bp >= bufLen) {
+ return 0;
+ }
+ if (buf[bp] == '\t') {
+ column = (column / TabInc * TabInc) + TabInc;
+ } else {
+ column++;
+ }
+ }
+ return column + 1; // positions are one-based
+ }
+ return 0;
+ } finally {
+ buf = null;
+ }
+ }
+
+ /** Return the content of the line containing a given pos.
+ */
+ public String getLine(int pos) {
+ try {
+ if (!findLine(pos))
+ return null;
+
+ int lineEnd = lineStart;
+ while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF)
+ lineEnd++;
+ if (lineEnd - lineStart == 0)
+ return null;
+ return new String(buf, lineStart, lineEnd - lineStart);
+ } finally {
+ buf = null;
+ }
+ }
+
+ public Map<JCTree, Integer> getEndPosTable() {
+ return endPosTable;
+ }
+
+ public void setEndPosTable(Map<JCTree, Integer> t) {
+ if (endPosTable != null && endPosTable != t)
+ throw new IllegalStateException("endPosTable already set");
+ endPosTable = t;
+ }
+
+ /** Find the line in the buffer that contains the current position
+ * @param pos Character offset into the buffer
+ */
+ private boolean findLine(int pos) {
+ if (pos == Position.NOPOS)
+ return false;
+
+ try {
+ // try and recover buffer from soft reference cache
+ if (buf == null && refBuf != null)
+ buf = refBuf.get();
+
+ if (buf == null) {
+ buf = initBuf(fileObject);
+ lineStart = 0;
+ line = 1;
+ } else if (lineStart > pos) { // messages don't come in order
+ lineStart = 0;
+ line = 1;
+ }
+
+ int bp = lineStart;
+ while (bp < bufLen && bp < pos) {
+ switch (buf[bp++]) {
+ case CR:
+ if (bp < bufLen && buf[bp] == LF) bp++;
+ line++;
+ lineStart = bp;
+ break;
+ case LF:
+ line++;
+ lineStart = bp;
+ break;
+ }
+ }
+ return bp <= bufLen;
+ } catch (IOException e) {
+ log.directError("source.unavailable");
+ buf = new char[0];
+ return false;
+ }
+ }
+
+ protected char[] initBuf(JavaFileObject fileObject) throws IOException {
+ char[] buf;
+ CharSequence cs = fileObject.getCharContent(true);
+ if (cs instanceof CharBuffer) {
+ CharBuffer cb = (CharBuffer) cs;
+ buf = JavacFileManager.toArray(cb);
+ bufLen = cb.limit();
+ } else {
+ buf = cs.toString().toCharArray();
+ bufLen = buf.length;
+ }
+ refBuf = new SoftReference<char[]>(buf);
+ return buf;
+ }
+
+ /** The underlying file object. */
+ protected JavaFileObject fileObject;
+
+ protected Map<JCTree, Integer> endPosTable;
+
+ /** A soft reference to the content of the file object. */
+ protected SoftReference<char[]> refBuf;
+
+ /** A temporary hard reference to the content of the file object. */
+ protected char[] buf;
+
+ /** The length of the content. */
+ protected int bufLen;
+
+ /** The start of a line found by findLine. */
+ protected int lineStart;
+
+ /** The line number of a line found by findLine. */
+ protected int line;
+
+ /** A log for reporting errors, such as errors accessing the content. */
+ protected AbstractLog log;
+}