/*******************************************************************************
* Copyright 2014 Ivan Shubin http://mindengine.net
*
* 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 net.mindengine.galen.parser;
import static net.mindengine.galen.parser.Expectations.isDelimeter;
import static net.mindengine.galen.suite.reader.Line.UNKNOWN_LINE;
import net.mindengine.galen.specs.page.CorrectionsRect;
import net.mindengine.galen.specs.page.CorrectionsRect.Correction;
import net.mindengine.galen.specs.reader.StringCharReader;
public class ExpectCorrection implements Expectation<CorrectionsRect> {
@Override
public CorrectionsRect read(StringCharReader reader) {
boolean started = false;
StringBuffer numbersText = new StringBuffer();
while(reader.hasMore()) {
char symbol = reader.next();
if (symbol == '(' && !started) {
started = true;
}
else if (symbol == ')') {
return processCorrection(numbersText.toString());
}
else if (!isDelimeter(symbol)) {
if (!started) {
throw new SyntaxException(UNKNOWN_LINE, "Error parsing corrections. Missing starting '(' symbol");
}
numbersText.append(symbol);
}
}
throw new SyntaxException(UNKNOWN_LINE, "Error parsing corrections. Missing closing ')' symbol");
}
private CorrectionsRect processCorrection(String numbersText) {
if (!numbersText.isEmpty()) {
String values[] = numbersText.split(",");
if (values.length == 4) {
return new CorrectionsRect(readCorrection(values[0]), readCorrection(values[1]), readCorrection(values[2]), readCorrection(values[3]));
}
else throw new SyntaxException(UNKNOWN_LINE, "Wrong number of arguments in corrections: " + values.length);
}
else throw new SyntaxException(UNKNOWN_LINE, "Error parsing corrections. No values provided");
}
private Correction readCorrection(String value) {
if (value.length() == 0) {
throw new SyntaxException("Incorrect correction. Don't use empty values");
}
char symbol = value.charAt(0);
if (symbol == '-') {
return new Correction(Integer.parseInt(value.substring(1)), CorrectionsRect.Type.MINUS);
}
else if (symbol == '+') {
return new Correction(Integer.parseInt(value.substring(1)), CorrectionsRect.Type.PLUS);
}
if (symbol == '=') {
return new Correction(Integer.parseInt(value.substring(1)), CorrectionsRect.Type.EQUALS);
}
else {
return new Correction(Integer.parseInt(value), CorrectionsRect.Type.PLUS);
}
}
}