ParseNode.java

package net.zerobone.knife.parser;

import net.zerobone.knife.ast.TranslationUnitNode;
import net.zerobone.knife.ast.entities.ProductionStatementBody;
import net.zerobone.knife.ast.statements.ProductionStatementNode;
import net.zerobone.knife.ast.statements.StatementNode;
import net.zerobone.knife.ast.statements.TypeStatementNode;
import net.zerobone.knife.lexer.tokens.CodeToken;
import net.zerobone.knife.lexer.tokens.IdToken;
import net.zerobone.knife.utils.StringUtils;

import java.lang.Object;
import java.util.ArrayList;

final class ParseNode {
	int actionId = 0;

	final int symbolId;

	Object payload = null;

	ArrayList<Object> children;

	ParseNode(int symbolId) {
		this.symbolId = symbolId;
		children = this.symbolId < 0 ? new ArrayList<>() : null;
	}

	void reduce() {
		Object v;
		switch (actionId - 1) {
			case 0:
			{
				v = new TranslationUnitNode();
			}
			break;
			case 1:
			{
				StatementNode s = (StatementNode)((ParseNode)children.get(1)).payload;
				TranslationUnitNode t = (TranslationUnitNode)((ParseNode)children.get(0)).payload;
				t.addStatement(s); v = t;
			}
			break;
			case 2:
			{
				IdToken nonTerminal = (IdToken)((ParseNode)children.get(2)).payload;
				ProductionStatementBody body = (ProductionStatementBody)((ParseNode)children.get(0)).payload;
				v = new ProductionStatementNode(nonTerminal.id, body.getProduction(), body.getCode());
			}
			break;
			case 3:
			{
				IdToken symbol = (IdToken)((ParseNode)children.get(1)).payload;
				IdToken type = (IdToken)((ParseNode)children.get(0)).payload;
				v = new TypeStatementNode(symbol.id, type.id);
			}
			break;
			case 4:
			{
				CodeToken code = (CodeToken)((ParseNode)children.get(0)).payload;
				v = new ProductionStatementBody(code == null ? null : code.code);
			}
			break;
			case 5:
			{
				IdToken s = (IdToken)((ParseNode)children.get(2)).payload;
				IdToken arg = (IdToken)((ParseNode)children.get(1)).payload;
				ProductionStatementBody b = (ProductionStatementBody)((ParseNode)children.get(0)).payload;

				if (StringUtils.isTerminal(s.id)) {
					if (arg == null) {
						b.addTerminal(s.id);
					}
					else {
						b.addTerminal(s.id, arg.id);
					}
				}
				else {
					if (arg == null) {
						b.addNonTerminal(s.id);
					}
					else {
						b.addNonTerminal(s.id, arg.id);
					}
				}
				v = b;

			}
			break;
			case 6:
			{
				v = null;
			}
			break;
			case 7:
			{
				Object c = (Object)((ParseNode)children.get(0)).payload;
				v = c;
			}
			break;
			case 8:
			{
				v = null;
			}
			break;
			case 9:
			{
				IdToken arg = (IdToken)((ParseNode)children.get(1)).payload;
				v = arg;
			}
			break;
			default:
				throw new IllegalStateException();
		}
		payload = v;
		children = null;
	}
}