www.pudn.com > grammaranalyse.rar > AccAnalyse.java

package jywhu; 
import java.io.*; 
import java.util.*; 
 
public class AccAnalyse { 
	private ArrayList al; 
	private static int i=0; 
	private static final String[] reserveWord={"if","else","while","read","write","int","real"}; 
	private String str; 
	private static int lineCount=0; 
	private int index=0; 
	private String token; 
	public AccAnalyse(String str){ 
		this.str=str; 
		al=new ArrayList(); 
	} 
	/*public ArrayList getList(){ 
		return al; 
	}*/ 
	public void analyse(){ 
		File f=new File(str); 
		try{ 
			if(!f.exists()){ 
				System.out.println("源文件不存在"); 
			}else{ 
					BufferedReader br=new BufferedReader(new FileReader(f)); 
					String s; 
					//开始词法分析 
					while((s=br.readLine())!=null){ 
						lineCount++; 
						//过滤行字符串 
						s=s.trim(); 
						System.out.println(lineCount + ":" + s); 
						char[] c=s.toCharArray(); 
						while(index'){ 
						    	   index++; 
						    	   token=this.contact(token, ch); 
						    	   //System.out.println(" " + " " + lineCount + ":" + token ); 
						    	   al.add(new Token("relop",token,lineCount)); 
						       }else{ 
						    	   //System.out.println(" " + " " + lineCount + ":" + token ); 
						    	   al.add(new Token("relop",token,lineCount)); 
						       } 
						      this.retract(); 
						      token=" "; 
						      break; 
						   case '-': 
							   token=this.contact(token, ch); 
							  // System.out.println(" " + " " + lineCount + ":" + token ); 
							   al.add(new Token("addop",token,lineCount)); 
							   token=" "; 
							   break; 
						   case '/': 
							   token=this.contact(token, ch); 
							   //System.out.println(" " + " " + lineCount + ":" + token ); 
							   al.add(new Token("mulop",token,lineCount)); 
							   token=" "; 
							   break; 
						   case ',': 
							   token=this.contact(token, ch); 
							   //System.out.println(" " + " " + lineCount + ":" + token ); 
							   al.add(new Token("comma",token,lineCount)); 
							   token=" "; 
							   break; 
						   case ';': 
							   token=this.contact(token, ch); 
							  // System.out.println(" " + " " + lineCount + ":" + token ); 
							   al.add(new Token("semicolon",token,lineCount)); 
							   token=" "; 
							   break; 
						default: 
							token=this.contact(token, ch); 
						    System.out.println(" " + " " + lineCount + ":" +  
						    		"[ERROR]在此行发现不能识别的单词,此行分析终止!" + " " + token); 
						    token=" "; 
						    break; 
						} 
						} 
						index=0; 
						} 
			} 
		}catch(Exception e){ 
			e.printStackTrace();		} 
	} 
	 
	//得到一个字符 
	public char getChar(char[] c){ 
		try{ 
			while((c[index]) == ' '){ 
				index++; 
			} 
			index++; 
		}catch(Exception e){ 
			e.printStackTrace(); 
		} 
		return c[index-1]; 
	} 
	 
	//得到先前字符的后一个字符 
	public char getNextChar(char[] c){ 
		index++; 
		return c[index-1]; 
	} 
	 
	public boolean isLetter(char ch){ 
		return Character.isLetter(ch); 
	} 
	 
	public boolean isDigit(char ch){ 
		return Character.isDigit(ch); 
	} 
	 
	//判断此字符串是否为保留字 
	public boolean isReserve(String token){ 
		for(int i=0;i