/*
Copyright (c) 1997-2008, Perforce Software, Inc.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1.  Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

2.  Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL PERFORCE SOFTWARE, INC. BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"


typedef enum { NUMBER, STRING } RecType;

/*******************************************************************************
 * Function to convert a string of the form "@text with embedded @@ signs@" 
 * into "text with embedded @ signs".
 ******************************************************************************/
static SV *UnescapeField( const char *str, int len )
{
    int	  in, out;
    int	  prev_at = 0;
    char *buf = 0;
    SV	 *cleanSV = 0;

    Newz( 1, buf, len, char );
    if ( len < 2 )
	croak( "Can't un-escape string - too short to be escaped!" );

    /* Skip the first and last @ signs automatically */
    for( in = 1, out = 0; in < ( len - 1 ); )
    {
	if ( str[ in ] == '@' )
	{
	    if ( prev_at ) buf[ out++ ] = '@';
	    prev_at = ! prev_at;
	    in++;
	}
	else
	{
	    buf[ out++ ] = str[ in++ ];
	    prev_at = 0;
	}
    }
    cleanSV = sv_2mortal( newSVpv( buf, out ) );
    Safefree( buf );
    return cleanSV;
}


/*******************************************************************************
 * Function to escape a string and return the escaped string
 ******************************************************************************/
SV *
EscapeField( SV *str )
{
    SV		*newstr;
    SV		**t_ptr;
    char	*p;
    STRLEN	len;
    int		start, end;

    if ( ! SvPOK ( str ) )
	croak( "argument is not a string" );

    p = SvPV( str, len );
    newstr = sv_2mortal( newSVpv( "@", 1 ) );

    for ( start = end = 0; end < len; end++ )
    {
	if ( p[ end ] == '@' )
	{
	    sv_catpvn( newstr, p + start, end - start + 1 );
	    sv_catpv( newstr, "@" );
	    start = end + 1;
	}
    }
    sv_catpvn( newstr, p + start, end - start );
    sv_catpv( newstr, "@" );
    return newstr;
}


MODULE = P4::Journal		PACKAGE = P4::JournalRec

 #******************************************************************************
 # Function to parse a journal record and return a Perl array containing the
 # individual fields
 #******************************************************************************

void
Fields( THIS )
    SV *THIS

    PREINIT:
	register char	*start;
	register char	*end;
	SV	**t_ptr;
	register int	in_string;
	register int	prev_at;	 /* last char was an @ */
    PPCODE:
    	if ( ! sv_isa( THIS, "P4::JournalRec" ) )
	    croak( "Not a P4::JournalRec object" );

	t_ptr = hv_fetch( (HV *)SvRV( THIS ), "record", 6, 0 );
	if ( ! t_ptr )
	    croak( "No member 'record' in P4::JournalRec object" );

	if ( ! SvPOK ( *t_ptr ) )
	    croak( "'record' member is not a string" );

	start = end = SvPV( *t_ptr, PL_na );
	in_string = 0;
	for ( prev_at = 0; *end; )
	{
	    if ( in_string )
	    {
		if ( *end == '@' )
		{
		    prev_at = ! prev_at;
		    end++;
		}
	    	else if ( prev_at )
		{
		    /* Found the end of the string */
		    EXTEND( SP, 1 );
		    XPUSHs( UnescapeField( start, end - start) );
		    in_string = 0;
		    prev_at = 0;
		    start = ++end;
		}
		else
		{
		    end++;
		}
	    }
	    else
	    {
		if ( *start == ' ' )
		{
		    end = ++start;
		}
		else if ( *end == '@' )
		{
		    in_string = 1;
		    end++;
		}
		else if ( *end == ' ' )
		{
		    /* Found the end of the field */
		    EXTEND( SP, 1 );
		    XPUSHs( sv_2mortal( newSVpv( start, end - start ) ) );
		    start = ++end;
		}
		else
		{ 
		    end++;
		}
	    }
	}
	if ( *start )
	{
	    /* Push the last field. */
	    EXTEND( SP, 1 );
	    XPUSHs( sv_2mortal( newSVpv( start, end - start ) ) );
	}

void
Set( THIS, ... )
    SV *THIS

    PREINIT:
	SV	*rec;
	SV	*field;
	int	item;
	char	*p;
	RecType	type;

    PPCODE:
    	if ( ! sv_isa( THIS, "P4::JournalRec" ) )
	    croak( "Not a P4::JournalRec object" );

	rec = newSVpv( "", 0 );

	for ( item = 1; item < items; item++ )
	{
	    int 	offset = 0;
	    STRLEN 	len;

	    type = NUMBER;
	    field = ST( item );
	    for ( p = SvPV( field, len ); *p; p++ )
	    {
		if ( ( *p < '0' || *p > '9' ) &&
		     ( *p < 'A' || *p > 'F' ) &&
		     ( *p != '-' ) )
		    type = STRING;
		else if ( *p == '-' && offset )
		    type = STRING;

		offset++;
	    }

	    /* empty fields are empty strings */
	    if ( len == 0 ) type = STRING;

	    if ( type == STRING  ) field = EscapeField( field );

	    sv_catsv( rec, field );
	    sv_catpv( rec, " " );
	}

	hv_store( (HV *)SvRV( THIS ), "record", 6, rec, 0 );
	EXTEND( SP, 1 );
	XPUSHs( rec );




        

MODULE = P4::Journal		PACKAGE = P4::Journal

 #******************************************************************************
 # Function to determine whether or not the journal record we have is
 # complete, or whether it ends in the middle of a multi-line field. 
 #******************************************************************************

int
CompleteRecord( THIS, rec )
    SV *THIS
    SV *rec

    PREINIT:
	int	in_string = 0;
	int	prev_at = 0;
	char	*str;

    CODE:
	if ( ! SvPOK( rec ) )
	    croak( "Not a string" );

	for( str = SvPV( rec, PL_na ); *str; str++ )
	{
	    if ( in_string )
	    {
		if ( *str == '@' )
		{
		    prev_at = ! prev_at;
		}
		else if ( prev_at )
		{
		    prev_at = 0;
		    in_string = 0;
		}
	    }
	    else
	    {
		if ( *str == '@' )
		    in_string = 1;
	    }
	}
	RETVAL = ! in_string;

    OUTPUT:
    	RETVAL