| /* |
| * Copyright (c) 1999, 2012, 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.io.IOException; |
| import java.lang.ref.SoftReference; |
| import java.nio.CharBuffer; |
| import javax.tools.JavaFileObject; |
| |
| import com.sun.tools.javac.file.JavacFileManager; |
| import com.sun.tools.javac.tree.EndPosTable; |
| |
| 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 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 class DiagnosticSource { |
| |
| /* constant DiagnosticSource to be used when sourcefile is missing */ |
| public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() { |
| @Override |
| protected boolean findLine(int pos) { |
| return false; |
| } |
| }; |
| |
| public DiagnosticSource(JavaFileObject fo, AbstractLog log) { |
| this.fileObject = fo; |
| this.log = log; |
| } |
| |
| private DiagnosticSource() {} |
| |
| /** Return the underlying file object handled by this |
| * DiagnosticSource object. |
| */ |
| public JavaFileObject getFile() { |
| return 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, boolean expandTabs) { |
| try { |
| if (findLine(pos)) { |
| int column = 0; |
| for (int bp = lineStart; bp < pos; bp++) { |
| if (bp >= bufLen) { |
| return 0; |
| } |
| if (buf[bp] == '\t' && expandTabs) { |
| 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 EndPosTable getEndPosTable() { |
| return endPosTable; |
| } |
| |
| public void setEndPosTable(EndPosTable 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 |
| */ |
| protected 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<>(buf); |
| return buf; |
| } |
| |
| /** The underlying file object. */ |
| protected JavaFileObject fileObject; |
| |
| protected EndPosTable 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; |
| } |