/*
* Copyright (c) 2008, 2009, 2010 Denis Tulskiy
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see <http://www.gnu.org/licenses/>.
*/
package com.tulskiy.musique.playlist.formatting;
import com.tulskiy.musique.playlist.formatting.tokens.Expression;
import com.tulskiy.musique.playlist.formatting.tokens.MethodExpression;
import com.tulskiy.musique.playlist.formatting.tokens.ParameterExpression;
import com.tulskiy.musique.playlist.formatting.tokens.TextExpression;
import java.util.ArrayList;
import java.util.Stack;
import java.util.StringTokenizer;
/**
* @Author: Denis Tulskiy
* @Date: Feb 6, 2010
*/
public class Parser {
public static Expression parse(String text) {
text = text.replaceAll("\\s*,\\s*", ",");
StringTokenizer st = new StringTokenizer(text, "$%,\'[])", true);
MethodExpression root = new MethodExpression("eval");
Stack<MethodExpression> stack = new Stack<MethodExpression>();
stack.push(root);
try {
while (st.hasMoreTokens()) {
String token = st.nextToken();
if (token.equals("%")) {
if (st.hasMoreTokens()) {
String s = st.nextToken();
s = Character.toUpperCase(s.charAt(0)) + s.substring(1);
stack.peek().addExpression(new ParameterExpression(s));
if (st.hasMoreTokens() && !st.nextToken().equals("%")) {
break;
}
}
} else if (token.equals("$")) {
if (st.hasMoreTokens()) {
String s = st.nextToken();
s = s.substring(0, s.length() - 1);
MethodExpression m = new MethodExpression(s);
stack.peek().addExpression(m);
stack.push(m);
}
} else if (token.equals(")") || token.equals("]")) {
stack.pop();
} else if (token.equals(",")) {
//ignore
} else if (token.equals("\'")) {
StringBuilder sb = new StringBuilder();
while (st.hasMoreTokens()) {
String str = st.nextToken();
if (str.equals("\'"))
break;
sb.append(str);
}
stack.peek().addExpression(new TextExpression(sb.toString()));
} else if (token.equals("[")) {
MethodExpression m = new MethodExpression("notNull");
stack.peek().addExpression(m);
stack.push(m);
} else {
stack.peek().addExpression(new TextExpression(token));
}
}
} catch (Exception e) {
// e.printStackTrace();
}
ArrayList<Expression> e = root.getExpressions();
if (e.size() == 1) {
return e.get(0);
} else {
return root;
}
}
}