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/*
* Copyright (C) 2013 The CyanogenMod Project
*
* 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 com.cyanogenmod.filemanager.ash.scanners;
import java.util.regex.Matcher;
import com.cyanogenmod.filemanager.ash.RegExpUtil;
/**
* An scanner to process an input, reporting every text into new lines.
*/
public class NewLineScanner extends Scanner {
private final NewLineScannerListener mListener;
/**
* The listener for the newline scanner
*/
public interface NewLineScannerListener {
/**
* When a new line is ready
*
* @param newline The newline detected
* @param start The start position of the new line within the input text
* @param end The end position of the new line within the input text
* @param sep The line separator detected
* @return boolean If processor must continue with the next line
*/
boolean onNewLine(CharSequence newline, int start, int end, CharSequence sep);
}
/**
* Constructor of <code>Scanner</code>
*
* @param input The input
* @param listener The listener where return every new line
*/
public NewLineScanner(CharSequence input, NewLineScannerListener listener) {
super(input);
this.mListener = listener;
}
/**
* {@inheritDoc}
*/
@Override
public void scan() {
if (this.mInput.length() == 0) return;
Matcher m = RegExpUtil.NEWLINE_PATTERN.matcher(this.mInput);
int next = 0;
while(m.find(next)) {
CharSequence line = this.mInput.subSequence(next, m.start());
if (!this.mListener.onNewLine(line, next, m.start(), m.group())) {
return;
}
next = m.end();
}
// The non-matched data
CharSequence line = this.mInput.subSequence(next, this.mInput.length());
this.mListener.onNewLine(line, next, this.mInput.length(), null);
}
}
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