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comparison src/com/go/trove/io/LinePositionReader.java @ 0:3dc0c5604566

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Initial checkin of blitz 2.0 fcs - no installer yet.
author Dan Creswell <dan.creswell@gmail.com>
date Sat, 21 Mar 2009 11:00:06 +0000
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1 /* ====================================================================
2 * Trove - Copyright (c) 1997-2000 Walt Disney Internet Group
3 * ====================================================================
4 * The Tea Software License, Version 1.1
5 *
6 * Copyright (c) 2000 Walt Disney Internet Group. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
18 * distribution.
19 *
20 * 3. The end-user documentation included with the redistribution,
21 * if any, must include the following acknowledgment:
22 * "This product includes software developed by the
23 * Walt Disney Internet Group (http://opensource.go.com/)."
24 * Alternately, this acknowledgment may appear in the software itself,
25 * if and wherever such third-party acknowledgments normally appear.
26 *
27 * 4. The names "Tea", "TeaServlet", "Kettle", "Trove" and "BeanDoc" must
28 * not be used to endorse or promote products derived from this
29 * software without prior written permission. For written
30 * permission, please contact opensource@dig.com.
31 *
32 * 5. Products derived from this software may not be called "Tea",
33 * "TeaServlet", "Kettle" or "Trove", nor may "Tea", "TeaServlet",
34 * "Kettle", "Trove" or "BeanDoc" appear in their name, without prior
35 * written permission of the Walt Disney Internet Group.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE WALT DISNEY INTERNET GROUP OR ITS
41 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
42 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
43 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
44 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
45 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
46 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
47 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
48 * ====================================================================
49 *
50 * For more information about Tea, please see http://opensource.go.com/.
51 */
52
53 package com.go.trove.io;
54
55 import java.io.*;
56
57 /******************************************************************************
58 * LinePositionReader aids in printing line numbers for error reporting.
59 *
60 * @author Brian S O'Neill
61 * @version
62 * <!--$$Revision: 1.1 $-->, <!--$$JustDate:--> 12/11/00 <!-- $-->
63 */
64 public class LinePositionReader extends PositionReader {
65 private int mLineNumber = 1;
66 private int mPushback = -1;
67
68 public LinePositionReader(Reader reader) {
69 super(reader);
70 }
71
72 public int read() throws IOException {
73 int c;
74
75 if (mPushback >= 0) {
76 c = mPushback;
77 mPushback = -1;
78 }
79 else {
80 c = super.read();
81 }
82
83 if (c == '\n') {
84 mLineNumber++;
85 }
86 else if (c == '\r') {
87 int peek = super.read();
88 if (peek != '\n') {
89 mLineNumber++;
90 }
91 mPushback = peek;
92 }
93
94 return c;
95 }
96
97 /**
98 * After calling readLine, calling getLineNumber returns the next line
99 * number.
100 */
101 public String readLine() throws IOException {
102 StringBuffer buf = new StringBuffer(80);
103 int line = mLineNumber;
104 int c;
105 while (line == mLineNumber && (c = read()) >= 0) {
106 buf.append((char)c);
107 }
108 return buf.toString();
109 }
110
111 /**
112 * Skips forward into the stream to the line number specified. The line
113 * can then be read by calling readLine. Calling getPosition
114 * returns the position that the line begins.
115 *
116 * @return the line number reached
117 */
118 public int skipForwardToLine(int line) throws IOException {
119 while (mLineNumber < line && read() >= 0) {}
120 return mLineNumber;
121 }
122
123 /**
124 * @return the number of the line currently being read or the next one
125 * available.
126 */
127 public int getLineNumber() {
128 return mLineNumber;
129 }
130
131 /**
132 * Converts all whitespace characters in a String to space characters
133 * (\u0020).
134 */
135 public static String cleanWhitespace(String str) {
136 int length = str.length();
137
138 StringBuffer buf = new StringBuffer(length);
139 for (int i=0; i<length; i++) {
140 char c = str.charAt(i);
141 if (Character.isWhitespace(c)) {
142 buf.append(' ');
143 }
144 else {
145 buf.append(c);
146 }
147 }
148
149 return buf.toString();
150 }
151
152 /**
153 * Creates and returns a String containing a sequence of the specified
154 * length, repeating the given character.
155 */
156 public static String createSequence(char c, int length) {
157 if (length < 0) length = 1;
158
159 StringBuffer buf = new StringBuffer(length);
160 for (; length > 0; length--) {
161 buf.append(c);
162 }
163 return buf.toString();
164 }
165 }