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/*
* Copyright 2003-2004 Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package org.apache.tools.ant.util;
import java.io.Reader;
import java.io.IOException;
import org.apache.tools.ant.ProjectComponent;
/**
* class to tokenize the input as lines seperated
* by \r (mac style), \r\n (dos/windows style) or \n (unix style)
* @author Peter Reilly
* @since Ant 1.6
*/
public class LineTokenizer extends ProjectComponent
implements Tokenizer {
private String lineEnd = "";
private int pushed = -2;
private boolean includeDelims = false;
/**
* attribute includedelims - whether to include
* the line ending with the line, or to return
* it in the posttoken
* default false
* @param includeDelims if true include /r and /n in the line
*/
public void setIncludeDelims(boolean includeDelims) {
this.includeDelims = includeDelims;
}
/**
* get the next line from the input
*
* @param in the input reader
* @return the line excluding /r or /n, unless includedelims is set
* @exception IOException if an error occurs reading
*/
public String getToken(Reader in) throws IOException {
int ch = -1;
if (pushed != -2) {
ch = pushed;
pushed = -2;
} else {
ch = in.read();
}
if (ch == -1) {
return null;
}
lineEnd = "";
StringBuffer line = new StringBuffer();
int state = 0;
while (ch != -1) {
if (state == 0) {
if (ch == '\r') {
state = 1;
} else if (ch == '\n') {
lineEnd = "\n";
break;
} else {
line.append((char) ch);
}
} else {
state = 0;
if (ch == '\n') {
lineEnd = "\r\n";
} else {
pushed = ch;
lineEnd = "\r";
}
break;
}
ch = in.read();
}
if (ch == -1 && state == 1) {
lineEnd = "\r";
}
if (includeDelims) {
line.append(lineEnd);
}
return line.toString();
}
/**
* @return the line ending character(s) for the current line
*/
public String getPostToken() {
if (includeDelims) {
return "";
}
return lineEnd;
}
}
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