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//
//  ========================================================================
//  Copyright (c) 1995-2018 Mort Bay Consulting Pty. Ltd.
//  ------------------------------------------------------------------------
//  All rights reserved. This program and the accompanying materials
//  are made available under the terms of the Eclipse Public License v1.0
//  and Apache License v2.0 which accompanies this distribution.
//
//      The Eclipse Public License is available at
//      http://www.eclipse.org/legal/epl-v10.html
//
//      The Apache License v2.0 is available at
//      http://www.opensource.org/licenses/apache2.0.php
//
//  You may elect to redistribute this code under either of these licenses.
//  ========================================================================
//

package org.eclipse.jetty.http;

import org.eclipse.jetty.util.TypeUtil;

/**
 * HTTP constants
 */
public class HttpTokens
{
    static final byte COLON= (byte)':';
    static final byte TAB= 0x09;
    static final byte LINE_FEED= 0x0A;
    static final byte CARRIAGE_RETURN= 0x0D;
    static final byte SPACE= 0x20;
    static final byte[] CRLF = {CARRIAGE_RETURN,LINE_FEED};

    public enum EndOfContent { UNKNOWN_CONTENT,NO_CONTENT,EOF_CONTENT,CONTENT_LENGTH,CHUNKED_CONTENT }


    public enum Type 
    { 
        CNTL,    // Control characters excluding LF, CR
        HTAB,    // Horizontal tab 
        LF,      // Line feed
        CR,      // Carriage return
        SPACE,   // Space 
        COLON,   // Colon character
        DIGIT,   // Digit
        ALPHA,   // Alpha
        TCHAR,   // token characters excluding COLON,DIGIT,ALPHA, which is equivalent to VCHAR excluding delimiters
        VCHAR,   // Visible characters excluding COLON,DIGIT,ALPHA
        OTEXT    // Obsolete text
    }
    
    public static class Token
    {
        private final Type _type;
        private final byte _b;
        private final char _c;
        private final int _x;
        
        private Token(byte b, Type type)
        {
            _type = type;
            _b = b;
            _c = (char)(0xff&b);
            char lc = (_c>='A' & _c<='Z')?((char)(_c-'A'+'a')):_c;
            _x = (_type==Type.DIGIT || _type==Type.ALPHA && lc>='a' && lc<='f')?TypeUtil.convertHexDigit(b):-1;
        }

        public Type getType()
        {
            return _type;
        }

        public byte getByte()
        {
            return _b;
        }

        public char getChar()
        {
            return _c;
        }
        
        public boolean isHexDigit()
        {
            return _x>=0;
        }
        
        public int getHexDigit()
        {
            return _x;
        }
        
        @Override
        public String toString()
        {
            switch(_type)
            {
                case SPACE:
                case COLON:
                case ALPHA:
                case DIGIT:
                case TCHAR:
                case VCHAR:
                    return _type+"='"+_c+"'";
                    
                case CR:
                    return "CR=\\r";
                    
                case LF:
                    return "LF=\\n";
                    
                default:
                    return String.format("%s=0x%x",_type,_b);
            }
        }

    }
    
    public final static Token[] TOKENS = new Token[256];

    static
    {
        for (int b=0; b<256; b++)
        {
            // token          = 1*tchar
            // tchar          = "!" / "#" / "$" / "%" / "&" / "'" / "*"
            //                / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
            //                / DIGIT / ALPHA
            //                ; any VCHAR, except delimiters
            // quoted-string  = DQUOTE *( qdtext / quoted-pair ) DQUOTE
            // qdtext         = HTAB / SP /%x21 / %x23-5B / %x5D-7E / obs-text
            // obs-text       = %x80-FF
            // comment        = "(" *( ctext / quoted-pair / comment ) ")"
            // ctext          = HTAB / SP / %x21-27 / %x2A-5B / %x5D-7E / obs-text
            // quoted-pair    = "\" ( HTAB / SP / VCHAR / obs-text )
            
            switch (b)
            {
                case LINE_FEED: 
                    TOKENS[b] = new Token((byte)b,Type.LF);
                    break;
                case CARRIAGE_RETURN: 
                    TOKENS[b] = new Token((byte)b,Type.CR);
                    break;
                case SPACE: 
                    TOKENS[b] = new Token((byte)b,Type.SPACE);
                    break;
                case TAB: 
                    TOKENS[b] = new Token((byte)b,Type.HTAB);
                    break;
                case COLON: 
                    TOKENS[b] = new Token((byte)b,Type.COLON);
                    break;
                    
                case '!': 
                case '#': 
                case '$': 
                case '%': 
                case '&': 
                case '\'': 
                case '*': 
                case '+': 
                case '-': 
                case '.': 
                case '^': 
                case '_': 
                case '`': 
                case '|': 
                case '~': 
                    TOKENS[b] = new Token((byte)b,Type.TCHAR);
                    break;
                    
                default:
                    if (b>=0x30 &&b<=0x39) // DIGIT
                        TOKENS[b] = new Token((byte)b,Type.DIGIT);
                    else if (b>=0x41 &&b<=0x5A) // ALPHA (uppercase)
                        TOKENS[b] = new Token((byte)b,Type.ALPHA);
                    else if (b>=0x61 &&b<=0x7A) // ALPHA (lowercase)
                        TOKENS[b] = new Token((byte)b,Type.ALPHA);
                    else if (b>=0x21 &&b<=0x7E) // Visible
                        TOKENS[b] = new Token((byte)b,Type.VCHAR);
                    else if (b>=0x80) // OBS
                        TOKENS[b] = new Token((byte)b,Type.OTEXT);
                    else
                        TOKENS[b] = new Token((byte)b,Type.CNTL);
            }
        }
    }
}