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src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/javac/util/DiagnosticSource.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 1357

c75be5bc5283

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25
aoqi@0	26	package com.sun.tools.javac.util;
aoqi@0	27
aoqi@0	28	import java.io.IOException;
aoqi@0	29	import java.lang.ref.SoftReference;
aoqi@0	30	import java.nio.CharBuffer;
aoqi@0	31	import javax.tools.JavaFileObject;
aoqi@0	32
aoqi@0	33	import com.sun.tools.javac.file.JavacFileManager;
aoqi@0	34	import com.sun.tools.javac.tree.EndPosTable;
aoqi@0	35
aoqi@0	36	import static com.sun.tools.javac.util.LayoutCharacters.*;
aoqi@0	37
aoqi@0	38	/**
aoqi@0	39	* A simple abstraction of a source file, as needed for use in a diagnostic message.
aoqi@0	40	* Provides access to the line and position in a line for any given character offset.
aoqi@0	41	*
aoqi@0	42	* <p><b>This is NOT part of any supported API.
aoqi@0	43	* If you write code that depends on this, you do so at your own risk.
aoqi@0	44	* This code and its internal interfaces are subject to change or
aoqi@0	45	* deletion without notice.</b>
aoqi@0	46	*/
aoqi@0	47	public class DiagnosticSource {
aoqi@0	48
aoqi@0	49	/* constant DiagnosticSource to be used when sourcefile is missing */
aoqi@0	50	public static final DiagnosticSource NO_SOURCE = new DiagnosticSource() {
aoqi@0	51	@Override
aoqi@0	52	protected boolean findLine(int pos) {
aoqi@0	53	return false;
aoqi@0	54	}
aoqi@0	55	};
aoqi@0	56
aoqi@0	57	public DiagnosticSource(JavaFileObject fo, AbstractLog log) {
aoqi@0	58	this.fileObject = fo;
aoqi@0	59	this.log = log;
aoqi@0	60	}
aoqi@0	61
aoqi@0	62	private DiagnosticSource() {}
aoqi@0	63
aoqi@0	64	/** Return the underlying file object handled by this
aoqi@0	65	* DiagnosticSource object.
aoqi@0	66	*/
aoqi@0	67	public JavaFileObject getFile() {
aoqi@0	68	return fileObject;
aoqi@0	69	}
aoqi@0	70
aoqi@0	71	/** Return the one-based line number associated with a given pos
aoqi@0	72	* for the current source file. Zero is returned if no line exists
aoqi@0	73	* for the given position.
aoqi@0	74	*/
aoqi@0	75	public int getLineNumber(int pos) {
aoqi@0	76	try {
aoqi@0	77	if (findLine(pos)) {
aoqi@0	78	return line;
aoqi@0	79	}
aoqi@0	80	return 0;
aoqi@0	81	} finally {
aoqi@0	82	buf = null;
aoqi@0	83	}
aoqi@0	84	}
aoqi@0	85
aoqi@0	86	/** Return the one-based column number associated with a given pos
aoqi@0	87	* for the current source file. Zero is returned if no column exists
aoqi@0	88	* for the given position.
aoqi@0	89	*/
aoqi@0	90	public int getColumnNumber(int pos, boolean expandTabs) {
aoqi@0	91	try {
aoqi@0	92	if (findLine(pos)) {
aoqi@0	93	int column = 0;
aoqi@0	94	for (int bp = lineStart; bp < pos; bp++) {
aoqi@0	95	if (bp >= bufLen) {
aoqi@0	96	return 0;
aoqi@0	97	}
aoqi@0	98	if (buf[bp] == '\t' && expandTabs) {
aoqi@0	99	column = (column / TabInc * TabInc) + TabInc;
aoqi@0	100	} else {
aoqi@0	101	column++;
aoqi@0	102	}
aoqi@0	103	}
aoqi@0	104	return column + 1; // positions are one-based
aoqi@0	105	}
aoqi@0	106	return 0;
aoqi@0	107	} finally {
aoqi@0	108	buf = null;
aoqi@0	109	}
aoqi@0	110	}
aoqi@0	111
aoqi@0	112	/** Return the content of the line containing a given pos.
aoqi@0	113	*/
aoqi@0	114	public String getLine(int pos) {
aoqi@0	115	try {
aoqi@0	116	if (!findLine(pos))
aoqi@0	117	return null;
aoqi@0	118
aoqi@0	119	int lineEnd = lineStart;
aoqi@0	120	while (lineEnd < bufLen && buf[lineEnd] != CR && buf[lineEnd] != LF)
aoqi@0	121	lineEnd++;
aoqi@0	122	if (lineEnd - lineStart == 0)
aoqi@0	123	return null;
aoqi@0	124	return new String(buf, lineStart, lineEnd - lineStart);
aoqi@0	125	} finally {
aoqi@0	126	buf = null;
aoqi@0	127	}
aoqi@0	128	}
aoqi@0	129
aoqi@0	130	public EndPosTable getEndPosTable() {
aoqi@0	131	return endPosTable;
aoqi@0	132	}
aoqi@0	133
aoqi@0	134	public void setEndPosTable(EndPosTable t) {
aoqi@0	135	if (endPosTable != null && endPosTable != t)
aoqi@0	136	throw new IllegalStateException("endPosTable already set");
aoqi@0	137	endPosTable = t;
aoqi@0	138	}
aoqi@0	139
aoqi@0	140	/** Find the line in the buffer that contains the current position
aoqi@0	141	* @param pos Character offset into the buffer
aoqi@0	142	*/
aoqi@0	143	protected boolean findLine(int pos) {
aoqi@0	144	if (pos == Position.NOPOS)
aoqi@0	145	return false;
aoqi@0	146
aoqi@0	147	try {
aoqi@0	148	// try and recover buffer from soft reference cache
aoqi@0	149	if (buf == null && refBuf != null)
aoqi@0	150	buf = refBuf.get();
aoqi@0	151
aoqi@0	152	if (buf == null) {
aoqi@0	153	buf = initBuf(fileObject);
aoqi@0	154	lineStart = 0;
aoqi@0	155	line = 1;
aoqi@0	156	} else if (lineStart > pos) { // messages don't come in order
aoqi@0	157	lineStart = 0;
aoqi@0	158	line = 1;
aoqi@0	159	}
aoqi@0	160
aoqi@0	161	int bp = lineStart;
aoqi@0	162	while (bp < bufLen && bp < pos) {
aoqi@0	163	switch (buf[bp++]) {
aoqi@0	164	case CR:
aoqi@0	165	if (bp < bufLen && buf[bp] == LF) bp++;
aoqi@0	166	line++;
aoqi@0	167	lineStart = bp;
aoqi@0	168	break;
aoqi@0	169	case LF:
aoqi@0	170	line++;
aoqi@0	171	lineStart = bp;
aoqi@0	172	break;
aoqi@0	173	}
aoqi@0	174	}
aoqi@0	175	return bp <= bufLen;
aoqi@0	176	} catch (IOException e) {
aoqi@0	177	log.directError("source.unavailable");
aoqi@0	178	buf = new char[0];
aoqi@0	179	return false;
aoqi@0	180	}
aoqi@0	181	}
aoqi@0	182
aoqi@0	183	protected char[] initBuf(JavaFileObject fileObject) throws IOException {
aoqi@0	184	char[] buf;
aoqi@0	185	CharSequence cs = fileObject.getCharContent(true);
aoqi@0	186	if (cs instanceof CharBuffer) {
aoqi@0	187	CharBuffer cb = (CharBuffer) cs;
aoqi@0	188	buf = JavacFileManager.toArray(cb);
aoqi@0	189	bufLen = cb.limit();
aoqi@0	190	} else {
aoqi@0	191	buf = cs.toString().toCharArray();
aoqi@0	192	bufLen = buf.length;
aoqi@0	193	}
aoqi@0	194	refBuf = new SoftReference<char[]>(buf);
aoqi@0	195	return buf;
aoqi@0	196	}
aoqi@0	197
aoqi@0	198	/** The underlying file object. */
aoqi@0	199	protected JavaFileObject fileObject;
aoqi@0	200
aoqi@0	201	protected EndPosTable endPosTable;
aoqi@0	202
aoqi@0	203	/** A soft reference to the content of the file object. */
aoqi@0	204	protected SoftReference<char[]> refBuf;
aoqi@0	205
aoqi@0	206	/** A temporary hard reference to the content of the file object. */
aoqi@0	207	protected char[] buf;
aoqi@0	208
aoqi@0	209	/** The length of the content. */
aoqi@0	210	protected int bufLen;
aoqi@0	211
aoqi@0	212	/** The start of a line found by findLine. */
aoqi@0	213	protected int lineStart;
aoqi@0	214
aoqi@0	215	/** The line number of a line found by findLine. */
aoqi@0	216	protected int line;
aoqi@0	217
aoqi@0	218	/** A log for reporting errors, such as errors accessing the content. */
aoqi@0	219	protected AbstractLog log;
aoqi@0	220	}