1.1 --- a/src/com/sun/org/apache/regexp/internal/ReaderCharacterIterator.java Sat Oct 24 16:18:47 2020 +0800
1.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000
1.3 @@ -1,164 +0,0 @@
1.4 -/*
1.5 - * reserved comment block
1.6 - * DO NOT REMOVE OR ALTER!
1.7 - */
1.8 -/*
1.9 - * Copyright 1999-2004 The Apache Software Foundation.
1.10 - *
1.11 - * Licensed under the Apache License, Version 2.0 (the "License");
1.12 - * you may not use this file except in compliance with the License.
1.13 - * You may obtain a copy of the License at
1.14 - *
1.15 - * http://www.apache.org/licenses/LICENSE-2.0
1.16 - *
1.17 - * Unless required by applicable law or agreed to in writing, software
1.18 - * distributed under the License is distributed on an "AS IS" BASIS,
1.19 - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.20 - * See the License for the specific language governing permissions and
1.21 - * limitations under the License.
1.22 - */
1.23 -
1.24 -package com.sun.org.apache.regexp.internal;
1.25 -
1.26 -import java.io.Reader;
1.27 -import java.io.IOException;
1.28 -
1.29 -/**
1.30 - * Encapsulates java.io.Reader as CharacterIterator
1.31 - *
1.32 - * @author <a href="mailto:ales.novak@netbeans.com">Ales Novak</a>
1.33 - */
1.34 -public final class ReaderCharacterIterator implements CharacterIterator
1.35 -{
1.36 - /** Underlying reader */
1.37 - private final Reader reader;
1.38 -
1.39 - /** Buffer of read chars */
1.40 - private final StringBuffer buff;
1.41 -
1.42 - /** read end? */
1.43 - private boolean closed;
1.44 -
1.45 - /** @param reader a Reader, which is parsed */
1.46 - public ReaderCharacterIterator(Reader reader)
1.47 - {
1.48 - this.reader = reader;
1.49 - this.buff = new StringBuffer(512);
1.50 - this.closed = false;
1.51 - }
1.52 -
1.53 - /** @return a substring */
1.54 - public String substring(int beginIndex, int endIndex)
1.55 - {
1.56 - try
1.57 - {
1.58 - ensure(endIndex);
1.59 - return buff.toString().substring(beginIndex, endIndex);
1.60 - }
1.61 - catch (IOException e)
1.62 - {
1.63 - throw new StringIndexOutOfBoundsException(e.getMessage());
1.64 - }
1.65 - }
1.66 -
1.67 - /** @return a substring */
1.68 - public String substring(int beginIndex)
1.69 - {
1.70 - try
1.71 - {
1.72 - readAll();
1.73 - return buff.toString().substring(beginIndex);
1.74 - }
1.75 - catch (IOException e)
1.76 - {
1.77 - throw new StringIndexOutOfBoundsException(e.getMessage());
1.78 - }
1.79 - }
1.80 -
1.81 - /** @return a character at the specified position. */
1.82 - public char charAt(int pos)
1.83 - {
1.84 - try
1.85 - {
1.86 - ensure(pos);
1.87 - return buff.charAt(pos);
1.88 - }
1.89 - catch (IOException e)
1.90 - {
1.91 - throw new StringIndexOutOfBoundsException(e.getMessage());
1.92 - }
1.93 - }
1.94 -
1.95 - /** @return <tt>true</tt> iff if the specified index is after the end of the character stream */
1.96 - public boolean isEnd(int pos)
1.97 - {
1.98 - if (buff.length() > pos)
1.99 - {
1.100 - return false;
1.101 - }
1.102 - else
1.103 - {
1.104 - try
1.105 - {
1.106 - ensure(pos);
1.107 - return (buff.length() <= pos);
1.108 - }
1.109 - catch (IOException e)
1.110 - {
1.111 - throw new StringIndexOutOfBoundsException(e.getMessage());
1.112 - }
1.113 - }
1.114 - }
1.115 -
1.116 - /** Reads n characters from the stream and appends them to the buffer */
1.117 - private int read(int n) throws IOException
1.118 - {
1.119 - if (closed)
1.120 - {
1.121 - return 0;
1.122 - }
1.123 -
1.124 - char[] c = new char[n];
1.125 - int count = 0;
1.126 - int read = 0;
1.127 -
1.128 - do
1.129 - {
1.130 - read = reader.read(c);
1.131 - if (read < 0) // EOF
1.132 - {
1.133 - closed = true;
1.134 - break;
1.135 - }
1.136 - count += read;
1.137 - buff.append(c, 0, read);
1.138 - }
1.139 - while (count < n);
1.140 -
1.141 - return count;
1.142 - }
1.143 -
1.144 - /** Reads rest of the stream. */
1.145 - private void readAll() throws IOException
1.146 - {
1.147 - while(! closed)
1.148 - {
1.149 - read(1000);
1.150 - }
1.151 - }
1.152 -
1.153 - /** Reads chars up to the idx */
1.154 - private void ensure(int idx) throws IOException
1.155 - {
1.156 - if (closed)
1.157 - {
1.158 - return;
1.159 - }
1.160 -
1.161 - if (idx < buff.length())
1.162 - {
1.163 - return;
1.164 - }
1.165 - read(idx + 1 - buff.length());
1.166 - }
1.167 -}
