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/*******************************************************************************
* Copyright (c) 2014 Jeff Martin.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the GNU Public License v3.0
* which accompanies this distribution, and is available at
* http://www.gnu.org/licenses/gpl.html
*
* Contributors:
* Jeff Martin - initial API and implementation
******************************************************************************/
package cuchaz.enigma.mapping;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.util.Deque;
import com.google.common.collect.Queues;
public class MappingsReader {
public Mappings read(Reader in) throws IOException, MappingParseException {
return read(new BufferedReader(in));
}
public Mappings read(BufferedReader in) throws IOException, MappingParseException {
Mappings mappings = new Mappings();
Deque<Object> mappingStack = Queues.newArrayDeque();
int lineNumber = 0;
String line = null;
while ( (line = in.readLine()) != null) {
lineNumber++;
// strip comments
int commentPos = line.indexOf('#');
if (commentPos >= 0) {
line = line.substring(0, commentPos);
}
// skip blank lines
if (line.trim().length() <= 0) {
continue;
}
// get the indent of this line
int indent = 0;
for (int i = 0; i < line.length(); i++) {
if (line.charAt(i) != '\t') {
break;
}
indent++;
}
// handle stack pops
while (indent < mappingStack.size()) {
mappingStack.pop();
}
String[] parts = line.trim().split("\\s");
try {
// read the first token
String token = parts[0];
if (token.equalsIgnoreCase("CLASS")) {
ClassMapping classMapping;
if (indent == 0) {
// outer class
classMapping = readClass(parts, false);
mappings.addClassMapping(classMapping);
} else if (indent == 1) {
// inner class
if (! (mappingStack.getFirst() instanceof ClassMapping)) {
throw new MappingParseException(lineNumber, "Unexpected CLASS entry here!");
}
classMapping = readClass(parts, true);
((ClassMapping)mappingStack.getFirst()).addInnerClassMapping(classMapping);
} else {
throw new MappingParseException(lineNumber, "Unexpected CLASS entry nesting!");
}
mappingStack.push(classMapping);
} else if (token.equalsIgnoreCase("FIELD")) {
if (mappingStack.isEmpty() || ! (mappingStack.getFirst() instanceof ClassMapping)) {
throw new MappingParseException(lineNumber, "Unexpected FIELD entry here!");
}
((ClassMapping)mappingStack.getFirst()).addFieldMapping(readField(parts));
} else if (token.equalsIgnoreCase("METHOD")) {
if (mappingStack.isEmpty() || ! (mappingStack.getFirst() instanceof ClassMapping)) {
throw new MappingParseException(lineNumber, "Unexpected METHOD entry here!");
}
MethodMapping methodMapping = readMethod(parts);
((ClassMapping)mappingStack.getFirst()).addMethodMapping(methodMapping);
mappingStack.push(methodMapping);
} else if (token.equalsIgnoreCase("ARG")) {
if (mappingStack.isEmpty() || ! (mappingStack.getFirst() instanceof MethodMapping)) {
throw new MappingParseException(lineNumber, "Unexpected ARG entry here!");
}
((MethodMapping)mappingStack.getFirst()).addArgumentMapping(readArgument(parts));
}
} catch (ArrayIndexOutOfBoundsException | NumberFormatException ex) {
throw new MappingParseException(lineNumber, "Malformed line!");
}
}
return mappings;
}
private ArgumentMapping readArgument(String[] parts) {
return new ArgumentMapping(Integer.parseInt(parts[1]), parts[2]);
}
private ClassMapping readClass(String[] parts, boolean makeSimple) {
if (parts.length == 2) {
return new ClassMapping(parts[1]);
} else {
return new ClassMapping(parts[1], parts[2]);
}
}
private FieldMapping readField(String[] parts) {
return new FieldMapping(parts[1], new Type(parts[3]), parts[2]);
}
private MethodMapping readMethod(String[] parts) {
if (parts.length == 3) {
return new MethodMapping(parts[1], new Signature(parts[2]));
} else {
return new MethodMapping(parts[1], new Signature(parts[3]), parts[2]);
}
}
}
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