0916 词法分析（3）

package compileWork;

import java.util.ArrayList;
import java.util.Scanner;

public class compileWork_1
{
public static void main(String args[])
{
Scanner s=new Scanner(System.in);
System.out.println("please input code");
String scode=s.nextLine();
s.close();
ArrayList<String> arrayphrase=new ArrayList<String>();
int i;
for(i=0;i<scode.length();i++)
{
char[] stemp=scode.substring(i, i+1).toCharArray();
char cword=stemp[0];
String sphrase="";
int flag=0;
while(i<scode.length()&&cword<='Z'&&cword>='A'||cword<='z'&&cword>='a'||cword>='0'&&cword<='9')
{
flag=1;
i++;
sphrase+=cword;
if(i<scode.length()){
char[] cnextTemp=scode.substring(i,i+1).toCharArray();
cword=cnextTemp[0];
}else{
break;
}
}
if(flag==1){
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword=='<')
{
i++;
sphrase+=cword;
char[] cnextTemp=scode.substring(i,i+1).toCharArray();
cword=cnextTemp[0];
if(i<scode.length()&&i<scode.length()&&cword=='=')
{
sphrase+=cword;
}
if(i<scode.length()&&cword=='>')
{
sphrase+=cword;
}
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword==':')
{
sphrase+=cword;
char[] cnextTemp=scode.substring(i+1,i+2).toCharArray();
cword=cnextTemp[0];
if(i<scode.length()&&i<scode.length()&&cword=='=')
{
i++;
sphrase+=cword;
}
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword=='+')
{
sphrase+=cword;
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword=='-')
{
sphrase+=cword;
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword=='*')
{
sphrase+=cword;
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword=='/')
{
sphrase+=cword;
arrayphrase.add(sphrase);
sphrase="";
}
if(i<scode.length()&&cword==';')
{
sphrase+=cword;
arrayphrase.add(sphrase);
sphrase="";
}

}
for(String ssign :arrayphrase){
switch (ssign){
case "begin":
System.out.print("<1 "+ssign+">");
break;
case "end":
System.out.print("<2 "+ssign+">");
break;
case "if":
System.out.print("<3 "+ssign+">");
break;
case "then":
System.out.print("<4 "+ssign+">");
break;
case "else":
System.out.print("<5 "+ssign+">");
break;
case "while":
System.out.print("<6 "+ssign+">");
break;
case "do":
System.out.print("<7 "+ssign+">");
break;
case "+":
System.out.print("<13 "+ssign+">");
break;
case "-":
System.out.print("<14 "+ssign+">");
break;
case "*":
System.out.print("<15 "+ssign+">");
break;
case "/":
System.out.print("<16 "+ssign+">");
break;
case "<=":
System.out.print("<17 "+ssign+">");
break;
case "<>":
System.out.print("<18 "+ssign+">");
break;
case "<":
System.out.print("<19 "+ssign+">");
break;
case ":":
System.out.print("<21 "+ssign+">");
break;
case ":=":
System.out.print("<22 "+ssign+">");
break;
case ";":
System.out.print("<23 "+ssign+">");
break;
default:
int flagisn=1;
char[] cssigntemp=ssign.toCharArray();
for(int k=0;k<ssign.length();k++){
if(Character.isDigit(cssigntemp[k])!=true){
flagisn=0;
}
}
if(flagisn==1){
System.out.print("<11 "+ssign+">");
}else{
System.out.printf("<10"+ssign+">");
}
}
}
}
}