Mercurial > hg > blitz_condensed
view src/com/go/trove/io/SourceReader.java @ 0:3dc0c5604566
Initial checkin of blitz 2.0 fcs - no installer yet.
author | Dan Creswell <dan.creswell@gmail.com> |
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date | Sat, 21 Mar 2009 11:00:06 +0000 |
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/* ==================================================================== * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group * ==================================================================== * The Tea Software License, Version 1.1 * * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. The end-user documentation included with the redistribution, * if any, must include the following acknowledgment: * "This product includes software developed by the * Walt Disney Internet Group (http://opensource.go.com/)." * Alternately, this acknowledgment may appear in the software itself, * if and wherever such third-party acknowledgments normally appear. * * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must * not be used to endorse or promote products derived from this * software without prior written permission. For written * permission, please contact opensource@dig.com. * * 5. Products derived from this software may not be called "Tea", * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet", * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior * written permission of the Walt Disney Internet Group. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * For more information about Tea, please see http://opensource.go.com/. */ package com.go.trove.io; import java.io.*; /****************************************************************************** * The SourceReader provides several services for reading source input. * It calculates line numbers, position in the source file, supports two * character pushback, extracts code from text that allows mixed code and * plain text, and it processes unicode escape sequences that appear in * source code. * * <p>Readers return -1 when the end of the stream, has been reached, and so * does SourceReader. SourceReader will also return other special negative * values to indicate a tag substitution. ENTER_CODE is returned to indicate * that characters read are in source code, and ENTER_TEXT is returned to * indicate that characters read are in plain text. The first character read * from a SourceReader is either ENTER_CODE or ENTER_TEXT; * * @author Brian S O'Neill * @version * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 4/26/01 <!-- $--> */ public class SourceReader extends PushbackPositionReader { public static final int ENTER_CODE = -2; public static final int ENTER_TEXT = -3; private static Reader createReader(Reader source, String beginTag, String endTag) { String[] tags = new String[4]; int[] codes = new int[4]; int i = 0; // Convert different kinds of line breaks into the newline character. tags[i] = "\r\n"; codes[i++] = '\n'; tags[i] = "\r"; codes[i++] = '\n'; if (beginTag != null && beginTag.length() > 0) { tags[i] = beginTag; codes[i++] = ENTER_CODE; } if (endTag != null && endTag.length() > 0) { tags[i] = endTag; codes[i++] = ENTER_TEXT; } if (i < 4) { String[] newTags = new String[i]; System.arraycopy(tags, 0, newTags, 0, i); tags = newTags; int[] newCodes = new int[i]; System.arraycopy(codes, 0, newCodes, 0, i); codes = newCodes; } return new UnicodeReader(new TagReader(source, tags, codes)); } private UnicodeReader mUnicodeReader; private TagReader mTagReader; private boolean mClosed = false; // The current line in the source. (1..) private int mLine = 1; private int mFirst; private String mBeginTag; private String mEndTag; /** * The begin and end tags for a SourceReader are optional. If the begin * tag is null or has zero length, then the SourceReader starts reading * characters as if they were source code. * * <p>If the end tag is null or has zero length, then a source code * region continues to the end of the input Reader's characters. * * @param source the source reader * @param beginTag tag that marks the beginning of a source code region * @param endTag tag that marks the end of a source code region */ public SourceReader(Reader source, String beginTag, String endTag) { this(source, beginTag, endTag, false); } /** * The begin and end tags for a SourceReader are optional. If the begin * tag is null or has zero length, then the SourceReader starts reading * characters as if they were source code. * * <p>If the end tag is null or has zero length, then a source code * region continues to the end of the input Reader's characters. * * @param source the source reader * @param beginTag tag that marks the beginning of a source code region * @param endTag tag that marks the end of a source code region * @param inCode flag that indicates if the stream is starting in code */ public SourceReader(Reader source, String beginTag, String endTag, boolean inCode) { super(createReader(source, beginTag, endTag), 2); mUnicodeReader = (UnicodeReader)in; mTagReader = (TagReader)mUnicodeReader.getOriginalSource(); boolean codeMode = ((beginTag == null || beginTag.length() == 0) || inCode); mFirst = (codeMode) ? ENTER_CODE : ENTER_TEXT; mBeginTag = beginTag; mEndTag = endTag; } public String getBeginTag() { return mBeginTag; } public String getEndTag() { return mEndTag; } /** * All newline character patterns are are converted to \n. */ public int read() throws IOException { int c; if (mFirst != 0) { c = mFirst; mFirst = 0; } else { c = super.read(); } if (c == '\n') { mLine++; } else if (c == ENTER_CODE) { mUnicodeReader.setEscapesEnabled(true); } else if (c == ENTER_TEXT) { mUnicodeReader.setEscapesEnabled(false); } return c; } public int getLineNumber() { return mLine; } /** * The position in the reader where the last read character ended. The * position of the first character read from a Reader is zero. * * <p>The end position is usually the same as the start position, but * sometimes a SourceReader may combine multiple characters into a * single one. * * @return the end position where the last character was read */ public int getEndPosition() { int e = getNextPosition() - 1; return (e < getStartPosition()) ? getStartPosition() : e; } public void ignoreTags(boolean ignore) { mTagReader.setEscapesEnabled(!ignore); } public boolean isClosed() { return mClosed; } public void close() throws IOException { mClosed = true; super.close(); } protected void unreadHook(int c) { if (c == '\n') { mLine--; } else if (c == ENTER_CODE) { mUnicodeReader.setEscapesEnabled(false); } else if (c == ENTER_TEXT) { mUnicodeReader.setEscapesEnabled(true); } } /** * Simple test program */ public static void main(String[] arg) throws Exception { Tester.test(arg); } private static class Tester { public static void test(String[] arg) throws Exception { String str = "This is \\" + "u0061 test.\n" + "This is \\" + "u00612 test.\n" + "This is \\" + "u0061" + "\\" + "u0061" + " test.\n" + "This is \\" + "u061 test.\n" + "This is \\\\" + "u0061 test.\n" + "This is \\" + "a test.\n" + "Plain text <%put code here%> plain text.\n" + "Plain text <\\" + "u0025put code here%> plain text.\n" + "Plain text <%put code here\\" + "u0025> plain text.\n"; Reader reader; if (arg.length > 0) { reader = new java.io.FileReader(arg[0]); } else { System.out.println("\nOriginal:\n"); reader = new StringReader(str); int c; while ( (c = reader.read()) != -1 ) { System.out.print((char)c); } } System.out.println("\nTest 1:\n"); if (arg.length > 0) { reader = new java.io.FileReader(arg[0]); } else { reader = new StringReader(str); } SourceReader sr = new SourceReader(reader, "<%", "%>"); int c; while ( (c = sr.read()) != -1 ) { System.out.print((char)c); System.out.print("\t" + c); System.out.print("\t" + sr.getLineNumber()); System.out.print("\t" + sr.getStartPosition()); System.out.println("\t" + sr.getEndPosition()); } System.out.println("\nTest 2:\n"); if (arg.length > 0) { reader = new java.io.FileReader(arg[0]); } else { reader = new StringReader(str); } sr = new SourceReader(reader, null, null); while ( (c = sr.read()) != -1 ) { System.out.print((char)c); System.out.print("\t" + c); System.out.print("\t" + sr.getLineNumber()); System.out.print("\t" + sr.getStartPosition()); System.out.println("\t" + sr.getEndPosition()); } } } }