1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,220 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.util;
1.30 +
1.31 +import java.io.IOException;
1.32 +import java.lang.ref.SoftReference;
1.33 +import java.nio.CharBuffer;
1.34 +import javax.tools.JavaFileObject;
1.35 +
1.36 +import com.sun.tools.javac.file.JavacFileManager;
1.37 +import com.sun.tools.javac.tree.EndPosTable;
1.38 +
1.39 +import static com.sun.tools.javac.util.LayoutCharacters.*;
1.40 +
1.41 +/**
1.42 + * A simple abstraction of a source file, as needed for use in a diagnostic message.
1.43 + * Provides access to the line and position in a line for any given character offset.
1.44 + *
1.45 + * <p><b>This is NOT part of any supported API.
1.46 + * If you write code that depends on this, you do so at your own risk.
1.47 + * This code and its internal interfaces are subject to change or
1.48 + * deletion without notice.</b>
1.49 + */
1.50 +public class DiagnosticSource {
1.51 +
1.52 + /* constant DiagnosticSource to be used when sourcefile is missing */
1.53 + public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() {
1.54 + @Override
1.55 + protected boolean findLine(int pos) {
1.56 + return false;
1.57 + }
1.58 + };
1.59 +
1.60 + public DiagnosticSource(JavaFileObject fo, AbstractLog log) {
1.61 + this.fileObject = fo;
1.62 + this.log = log;
1.63 + }
1.64 +
1.65 + private DiagnosticSource() {}
1.66 +
1.67 + /** Return the underlying file object handled by this
1.68 + * DiagnosticSource object.
1.69 + */
1.70 + public JavaFileObject getFile() {
1.71 + return fileObject;
1.72 + }
1.73 +
1.74 + /** Return the one-based line number associated with a given pos
1.75 + * for the current source file. Zero is returned if no line exists
1.76 + * for the given position.
1.77 + */
1.78 + public int getLineNumber(int pos) {
1.79 + try {
1.80 + if (findLine(pos)) {
1.81 + return line;
1.82 + }
1.83 + return 0;
1.84 + } finally {
1.85 + buf = null;
1.86 + }
1.87 + }
1.88 +
1.89 + /** Return the one-based column number associated with a given pos
1.90 + * for the current source file. Zero is returned if no column exists
1.91 + * for the given position.
1.92 + */
1.93 + public int getColumnNumber(int pos, boolean expandTabs) {
1.94 + try {
1.95 + if (findLine(pos)) {
1.96 + int column = 0;
1.97 + for (int bp = lineStart; bp < pos; bp++) {
1.98 + if (bp >= bufLen) {
1.99 + return 0;
1.100 + }
1.101 + if (buf[bp] == '\t' && expandTabs) {
1.102 + column = (column / TabInc * TabInc) + TabInc;
1.103 + } else {
1.104 + column++;
1.105 + }
1.106 + }
1.107 + return column + 1; // positions are one-based
1.108 + }
1.109 + return 0;
1.110 + } finally {
1.111 + buf = null;
1.112 + }
1.113 + }
1.114 +
1.115 + /** Return the content of the line containing a given pos.
1.116 + */
1.117 + public String getLine(int pos) {
1.118 + try {
1.119 + if (!findLine(pos))
1.120 + return null;
1.121 +
1.122 + int lineEnd = lineStart;
1.123 + while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF)
1.124 + lineEnd++;
1.125 + if (lineEnd - lineStart == 0)
1.126 + return null;
1.127 + return new String(buf, lineStart, lineEnd - lineStart);
1.128 + } finally {
1.129 + buf = null;
1.130 + }
1.131 + }
1.132 +
1.133 + public EndPosTable getEndPosTable() {
1.134 + return endPosTable;
1.135 + }
1.136 +
1.137 + public void setEndPosTable(EndPosTable t) {
1.138 + if (endPosTable != null && endPosTable != t)
1.139 + throw new IllegalStateException("endPosTable already set");
1.140 + endPosTable = t;
1.141 + }
1.142 +
1.143 + /** Find the line in the buffer that contains the current position
1.144 + * @param pos Character offset into the buffer
1.145 + */
1.146 + protected boolean findLine(int pos) {
1.147 + if (pos == Position.NOPOS)
1.148 + return false;
1.149 +
1.150 + try {
1.151 + // try and recover buffer from soft reference cache
1.152 + if (buf == null && refBuf != null)
1.153 + buf = refBuf.get();
1.154 +
1.155 + if (buf == null) {
1.156 + buf = initBuf(fileObject);
1.157 + lineStart = 0;
1.158 + line = 1;
1.159 + } else if (lineStart > pos) { // messages don't come in order
1.160 + lineStart = 0;
1.161 + line = 1;
1.162 + }
1.163 +
1.164 + int bp = lineStart;
1.165 + while (bp < bufLen && bp < pos) {
1.166 + switch (buf[bp++]) {
1.167 + case CR:
1.168 + if (bp < bufLen && buf[bp] == LF) bp++;
1.169 + line++;
1.170 + lineStart = bp;
1.171 + break;
1.172 + case LF:
1.173 + line++;
1.174 + lineStart = bp;
1.175 + break;
1.176 + }
1.177 + }
1.178 + return bp <= bufLen;
1.179 + } catch (IOException e) {
1.180 + log.directError("source.unavailable");
1.181 + buf = new char[0];
1.182 + return false;
1.183 + }
1.184 + }
1.185 +
1.186 + protected char[] initBuf(JavaFileObject fileObject) throws IOException {
1.187 + char[] buf;
1.188 + CharSequence cs = fileObject.getCharContent(true);
1.189 + if (cs instanceof CharBuffer) {
1.190 + CharBuffer cb = (CharBuffer) cs;
1.191 + buf = JavacFileManager.toArray(cb);
1.192 + bufLen = cb.limit();
1.193 + } else {
1.194 + buf = cs.toString().toCharArray();
1.195 + bufLen = buf.length;
1.196 + }
1.197 + refBuf = new SoftReference<char[]>(buf);
1.198 + return buf;
1.199 + }
1.200 +
1.201 + /** The underlying file object. */
1.202 + protected JavaFileObject fileObject;
1.203 +
1.204 + protected EndPosTable endPosTable;
1.205 +
1.206 + /** A soft reference to the content of the file object. */
1.207 + protected SoftReference<char[]> refBuf;
1.208 +
1.209 + /** A temporary hard reference to the content of the file object. */
1.210 + protected char[] buf;
1.211 +
1.212 + /** The length of the content. */
1.213 + protected int bufLen;
1.214 +
1.215 + /** The start of a line found by findLine. */
1.216 + protected int lineStart;
1.217 +
1.218 + /** The line number of a line found by findLine. */
1.219 + protected int line;
1.220 +
1.221 + /** A log for reporting errors, such as errors accessing the content. */
1.222 + protected AbstractLog log;
1.223 +}
