WEB邮件程序

开发平台：
C/C++

http.lex：源码内容
							package net.wastl.webmail.standalone;
import java_cup.runtime.*;   /* this is convenience, but not necessary */
import java.io.Reader;
/*
 * http.lex
 *
 * Created: April 1999
 *
 * Copyright (C) 1999-2000 Sebastian Schaffert
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
%%
%class HTTPLexer
%extends sym
%{
    boolean has_content=false;
    boolean versionset=false;
    boolean set_contenttype=false;
    boolean set_contentlength=false;
    String content_type;
    int contentlength=0;
    int cur_contentlength;
    StringBuffer string = new StringBuffer();
    private Symbol symbol(int type) {
	return new Symbol(type, yyline, yycolumn);
    }
    private Symbol symbol(int type, Object value) {
	return new Symbol(type, yyline, yycolumn, value);
    }
  
    public String getContentType() {
	return content_type;
    }
%}
%8bit
%column
%line
%caseless
%state HEADER
%state HEADERDATA
%state END
%state CONTENT
    //%cup
%type java_cup.runtime.Symbol
%eofval{
    return new java_cup.runtime.Symbol(sym.EOF);
%eofval}
DIGIT=[0-9]
HEX = "A" | "B" | "C" | "D" | "E" | "F" | "a" | "b" | "c" | "d" | "e" | "f" | DIGIT
CR=r
LF=n
SP=" "
HT=t
CRLF={CR} {LF} | {CR} | {LF} 
LWS={CRLF} ({SP}|{HT})+
METHOD="GET" | "POST" | "HEAD" | "PUT" | "OPTION"
VERSION="HTTP" "/" {DIGIT}+ "." {DIGIT}+
HEAD_SEP=({SP}|{HT})* ":" ({SP}|{HT})*
TOKEN=[^()<>@,;:\">/[]?={}t00-32127" "]
ANY=[32-255]
NATIONAL=[128-255]
PATH=":" | "@" | "&" | "=" | "+" | [A-Za-z0-9] | "%" {HEX} {HEX} | ";" | "/" | "?" | ":" | "!" | "*" | "'" | "(" | ")" | "," | "$" | "-" | "_" | "." | "%" | "|"
URI={TOKEN}+ "://" {PATH}+ | "/" {PATH}*
BOUND="multipart/form-data; boundary="
URLENC="application/x-www-form-urlencoded"
%%
/* Parsing the first line that has to contain Method, URI and HTTP-Version */
<YYINITIAL> {
  ({SP}|{HT})+     { 
                      return symbol(SP); 
                   }
  {CRLF}           { 
                      if(versionset) {
                        yybegin(HEADER); 
		        return symbol(CRLF);
                      }
                   }
  {METHOD}         { 
                      versionset=true;
                      return symbol(METHOD,yytext()); 
                   }
  {URI}            { 
                      return symbol(URI,yytext()); 
                   }
  {VERSION}        { 
                      return symbol(VERSION,yytext().substring(5)); 
                   }
}
<HEADER> {
  {CRLF}           {
                     if(has_content) {
			 cur_contentlength=0;
			 string.setLength(0); 
			 yybegin(CONTENT);
                    } else {
			yy_atEOF = true;            /* indicate end of file */
			yy_endRead = yy_startRead;  /* invalidate buffer    */
			yybegin(END);
		    }
		     return symbol(CRLF);
                   }
  {HEAD_SEP}       { 
                     string.setLength(0); 
                     yybegin(HEADERDATA); 
		     return symbol(HEAD_SEP);
                   }
  ({SP}|{HT})+     { 
                     return symbol(SP); 
                   }
  {TOKEN}+ / ":"   { 
		     if(yytext().toUpperCase().trim().equals("CONTENT-LENGTH")) {
			 set_contentlength=true;
		     } else if(yytext().toUpperCase().trim().equals("CONTENT-TYPE")) {
			 set_contenttype=true;
		     }
                     return symbol(TOKEN,yytext()); 
                   }
}
<HEADERDATA> {
  {BOUND} {TOKEN}+ |  {URLENC} {TOKEN}* { 
                     has_content=true;
		     string.append(yytext());
                   }
  {ANY}+           {  
		     string.append(yytext());
                   }
  {LWS}            { 
		     string.append(" ");
                   }
  {CRLF}           { 
		     if(set_contentlength) {
			 try {
			     contentlength=Integer.parseInt(string.toString());
			 } catch(NumberFormatException e) {
			     e.printStackTrace();
			 }
			 set_contentlength=false;
		     } else if(set_contenttype) {
			 content_type=string.toString();
			 set_contenttype=false;
		     }
		     yybegin(HEADER);  
                     return symbol(DATA,string.toString()); 
                   }
}
<CONTENT> {
  .|n            {  
		     string.append(yytext());
		     cur_contentlength++;
		     if(contentlength>0 && cur_contentlength >= contentlength) {
		       yy_atEOF = true;            /* indicate end of file */
		       yy_endRead = yy_startRead;  /* invalidate buffer    */
		       yybegin(END);  
                       return symbol(DATA,string.toString()); 
		     }
                   }
}
<END> {
    .|n { return symbol(EOF); }
}
/* error fallback */
.|n                             { System.err.println("Invalid input!"); }

						