readparameter.java

词法和语法分析器

/**
 * 
 */
package cminusCompiler;

/**
 * @author tanfei E-mail:[e-mail]
 * @version Create Time：2007-12-6 下午12:58:42 description:
 */

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.StringTokenizer;

public class ReadParameter {

	private LinkedList<Nonterminal> nonterminal;
	
	private HashMap<Integer, String> terminal;
	
	private HashMap<String, Integer> ter;

	private BufferedReader brReaderN;

	private BufferedReader brReader;

	private String strLine;

	private StringTokenizer tokenizer;

	public ReadParameter(LinkedList<Nonterminal> nonterminal, HashMap<Integer, String> terminal, HashMap<String, Integer> ter) {
		this.nonterminal = nonterminal;
		this.terminal = terminal;
		this.ter = ter;
		try {
			brReaderN = new BufferedReader(new FileReader("config/BNF"));
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("The file BNF can not be found!");
			System.exit(1);
		}

		try {
			brReader = new BufferedReader(new FileReader("config/terminal"));
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("The file terminal can not be found!");
			System.exit(1);
		}

	}

	public void readNonterminal() {
		try {
			strLine = brReaderN.readLine();
			LinkedList<String> tempList = new LinkedList<String>();
			Nonterminal nonter;
			String token;
			while (strLine != null) {
				
				tokenizer = new StringTokenizer(strLine);
				token = tokenizer.nextToken();
				nonter = new Nonterminal(token);
				tokenizer.nextToken();
				while (tokenizer.hasMoreTokens()) {
					token = tokenizer.nextToken();
					while ((!token.equals("|"))) {
						tempList.add(token);
						//System.out.println("add the token: " + token);
						if(tokenizer.hasMoreTokens())
							token = tokenizer.nextToken();
						else
							break;
					}
					nonter.getFollowElement().add(tempList);
					tempList = new LinkedList<String>();
					//System.out.println(tempList.size());
					//tempList.clear();
				}
				nonterminal.add(nonter);
				strLine = brReaderN.readLine();

			}
		} catch (Exception e) {
			e.printStackTrace();
			System.out.println("The content in the file BNF may have some errors!");
			System.exit(1);
		}
	}
	
	public void readTerminal(){
		try{
			strLine = brReader.readLine();
			int i = 0;
			String token;
			while(strLine != null){
				tokenizer = new StringTokenizer(strLine);
				token = tokenizer.nextToken();
				
				while(tokenizer.hasMoreTokens()){
					terminal.put(i, token);
					ter.put(token, i);
					i++;
					token = tokenizer.nextToken();
				}
				
				terminal.put(i, token);
				ter.put(token, i);
				i++;
				strLine = brReader.readLine();
				ter.put("$", i);
			}
			
		}catch (Exception e){
			e.printStackTrace();
			System.out.println("The content in the file terminal may have some errors!");
			System.exit(1);
		}
	}
}