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package com.jantuomi.interpreter.main.core.parser;
import com.jantuomi.interpreter.main.core.parser.ast.ASTNode;
import com.jantuomi.interpreter.main.core.tokenizer.token.ArgumentInfo;
import com.jantuomi.interpreter.main.core.tokenizer.token.Token;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Stack;
/**
* Created by jan on 11.6.2016.
*/
public class Parser {
private static final Parser instance = new Parser();
private List<Token> tokens;
private List<ASTNode> statementSequence;
public static Parser getInstance() {
return instance;
}
private Parser() {
}
private Stack<Token> stack;
public List<Token> parse(List<Token> tokens) {
this.tokens = tokens;
this.stack = new Stack<>();
List<Token> args = new ArrayList<>();
List<Token> output = new ArrayList<>();
for (Token t : tokens) {
if (t.getTokenType() == Token.Type.NewlineToken) {
// if (stack.size() > 0) {
// output.add(stack.pop());
// }
continue;
}
args.clear();
ArgumentInfo argumentInfo = t.getArgumentInfo();
if (!argumentInfo.getVarargs()) {
for (int i = 0; i < argumentInfo.getCount(); i++) {
args.add(stack.pop());
}
} else {
System.err.println("no vararg support yet");
}
Collections.reverse(args);
Token result = t.setArguments(args);
stack.push(result);
}
while (stack.size() > 0) {
output.add(stack.pop());
}
return output;
}
public void printTree(Token e) {
System.out.println("### Tree begin ###");
e.print(0);
System.out.println("### Tree end ###");
}
}
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