C语言词法分析程序java版
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附录：核心代码清单
C语言词法分析代码算法实习--------------------------------------------------------By NLLWRQ
功能类：
package conversion;
import java.io.*;
public class Work{
public String filename;
public int flage=1;
public int error[]={0,0,0,0,0};
public int error1[]={0,0,0,0,0,0};
StringBuffer buffer=new StringBuffer();
private String
Keychar[]={"int","char","long","float","double","short","unsigned","struct","union","enum","auto","ext ern",
"static","register","typedef","void","if","else","switch","case","default","do","while","for","break", "continue","return","goto","define","include","undef","ifdef","endif","line","sizeof","asm","fortran","ad a","pascal"};
private String Keyfile[]={"stdio","windows","stdlib","ctype","math","time","string"};
public Work(String filename){
this.filename=filename;
}
boolean isKeyfile(String ch){
for(int i=0;i if(Keyfile[i].equals(ch)) return true; return false; } boolean isKeychar(String ch){ for(int i=0;i if(Keychar[i].equals(ch)) return true; return false; } boolean isDigit(char ch){ if(ch>='0'&&ch<='9') return true; else return false; } boolean isLeter(char ch){ if((ch>='A'&&ch<='Z')||(ch>='a'&&ch<='z')||ch=='_') return true; else return false; } boolean isendline(char ch) { if(ch=='@') return true; else return false; } public void readFile()throws FileNotFoundException{ try{ FileReader fr=new FileReader(this.filename); BufferedReader br=new BufferedReader(fr); String temp=null; char end='@'; while((temp=br.readLine())!=null){ buffer.append(temp); buffer.append(end); } }catch(Exception e){ System.out.println("文件操作错误："+e.toString()); } } public String Analysis(){ int i=0; char ch; String str1=""; ViewFile a=null; while(i ch=buffer.charAt(i); if(isLeter(ch)){ StringBuffer temp=new StringBuffer(); temp.append(ch); ch=buffer.charAt(++i); while(isLeter(ch)||isDigit(ch)){ temp.append(ch); ch=buffer.charAt(++i); } if(isKeyfile(temp.toString())) { ch=buffer.charAt(i++); if(ch!='.') error[2]++; else { temp.append(ch); ch=buffer.charAt(i++); if(ch!='h') { error[3]++; } else temp.append(ch); } str1+="("+temp+"，"+"“"+"line="+flage+"”"+")"+"\t是头文件"+"\n"; } else if(isKeychar(temp.toString())) str1+="("+temp+"，"+"“"+"line="+flage+"”"+")"+"\t是关键字"+"\n"; else str1+="("+temp+"，"+"“"+"line="+flage+"”"+")"+"\t是标识符"+"\n"; } else if((ch=='[')||(ch==']')) { str1+="("+ch+"，"+"”"+"line="+flage+"“"+")"+"\t是运算符"+"\n"; i++; if(ch=='[') error[0]++; else error[1]++; }