/*
* Copyright 2011-2011 Gregory Shrago
*
* 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 peg;
import org.antlr.runtime.ANTLRFileStream;
import org.antlr.runtime.CommonTokenStream;
import org.antlr.runtime.tree.CommonTree;
import org.antlr.runtime.tree.Tree;
import java.io.File;
public class Main {
public static void main(String... args) throws Exception {
String filePath = args[0];
String toDir = args.length > 1? args[1] :
new File(new File(filePath).getParentFile(), "gen").getAbsolutePath();
GrammarLexer lex = new GrammarLexer(new ANTLRFileStream(filePath));
CommonTokenStream tokens = new CommonTokenStream(lex);
GrammarParser parser = new GrammarParser(tokens);
CommonTree tree = parser.file().tree;
System.out.println(dumpTree(tree, new StringBuilder(), 0));
new Generator(tree, toDir).generate();
}
public static StringBuilder dumpTree(Tree tree, StringBuilder sb, int level) {
int childCount = tree.getChildCount();
int type = tree.getType();
if (level > 0 && (tree.getParent().getType() == GrammarParser.OR || tree.getChildIndex() == 0 || childCount > 0)) {
sb.append("\n");
for (int i=0; i<level; i++) sb.append(" ");
}
else if (level > 0) sb.append(" ");
sb.append(GrammarParser.tokenNames[type]);
if (childCount == 0) {
sb.append("(").append(tree.getText()).append(")");
}
else {
sb.append(":");
for (int i = 0; i< childCount; i++) {
dumpTree(tree.getChild(i), sb, level + 1);
}
}
return sb;
}
}