p4mapmaker.cpp #1

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/*******************************************************************************
 * Name		: p4mapmaker.cpp
 *
 * Author	: Tony Smith <tony@perforce.com> 
 *
 * Description	: Class to encapsulate Perforce map manipulation from Ruby
 *
 ******************************************************************************/
#include <ruby.h>
#include "undefdups.h"
#include <p4/clientapi.h>
#include <p4/mapapi.h>
#include <p4/debug.h>
#include "p4rubydebug.h"
#include "p4utils.h"
#include "p4mapmaker.h"


P4MapMaker::P4MapMaker()
{
    map = new MapApi;
}

P4MapMaker::~P4MapMaker()
{
    delete map;
}

P4MapMaker::P4MapMaker( const P4MapMaker &m )
{
    StrBuf	l, r;
    const StrPtr *s;
    MapType	t;
    int 	i;

    map = new MapApi;
    for( i = 0; i < m.map->Count(); i++ )
    {
	s = m.map->GetLeft( i );
	if( !s ) break;
	l = *s;

	s = m.map->GetRight( i );
	if( !s ) break;
	r = *s;

	t = m.map->GetType( i );

	map->Insert( l, r, t );
    }
}
    

P4MapMaker * 
P4MapMaker::Join( P4MapMaker *l, P4MapMaker *r)
{
    P4MapMaker *m = new P4MapMaker();
    delete m->map;

    m->map = MapApi::Join( l->map, r->map );
    return m;
}

void
P4MapMaker::Insert( VALUE m )
{
    StrBuf	in;
    StrBuf	lbuf;
    StrBuf	r;
    StrRef	l;
    MapType	t = MapInclude;

    in = StringValuePtr( m );
    SplitMapping( in, lbuf, r );

    l = lbuf.Text();

    // Look for mapType in lhs only. 
    if( l[ 0 ] == '-' )
    {
	l += 1;
	t = MapExclude;
    }
    else if( l[ 0 ] == '+' )
    {
	l += 1;
	t = MapOverlay;
    }

    map->Insert( l, r, t );
}


void
P4MapMaker::Insert( VALUE l, VALUE r )
{
    StrBuf	left;
    StrBuf	right;
    StrBuf *	dest = &left;
    int		quoted = 0;
    int		index = 0;

    const char *p;
    MapType	t = MapInclude;

    p = StringValuePtr( l );
    for( ; ; )
    {
	for( index = 0; *p; p++ )
	{
	    switch( *p )
	    {
	    case '"':
		quoted = !quoted;
		break;

	    case ' ':
	    case '\t':
		// Embedded whitespace ok; leading not.
		if( quoted || index )
		{
		    dest->Extend( *p );
		    index++;
		}
		break;

	    case '-':
		if( !index )
		    t = MapExclude;
		else 
		    dest->Extend( *p );
		index++;
		break;
		
	    case '+':
		if( !index )
		    t = MapOverlay;
		else 
		    dest->Extend( *p );
		index++;
		break;

	    default:
		dest->Extend( *p );
		index++;
	    }
	}

	if( dest == &right )
	    break;

	dest = &right;
	p = StringValuePtr( r );
	quoted = 0;
    }
    left.Terminate();
    right.Terminate();

    map->Insert( left, right, t );
}

int
P4MapMaker::Count()
{
    return map->Count();
}

void
P4MapMaker::Clear()
{
    map->Clear();
}

void
P4MapMaker::Reverse()
{
    MapApi *		nmap = new MapApi;
    const StrPtr *	l;
    const StrPtr *	r;
    MapType		t;

    for( int i = 0; i < map->Count(); i++ )
    {
	l = map->GetLeft( i );
	r = map->GetRight( i );
	t = map->GetType( i );

	nmap->Insert( *r, *l, t );
    }

    delete map;
    map = nmap;
}
	
VALUE
P4MapMaker::Translate( VALUE p, int fwd )
{
    StrBuf	from;
    StrBuf	to;
    MapDir	dir = MapLeftRight;

    if( !fwd )
	dir = MapRightLeft;

    from = StringValuePtr( p );
    if( map->Translate( from, to, dir ) )
	return P4Utils::ruby_string( to.Text(), to.Length() );
    return Qnil;
}

VALUE
P4MapMaker::Lhs()
{
    VALUE		a = rb_ary_new();
    StrBuf		s;
    const StrPtr *	l;
    MapType		t;
    int			quote;

    for( int i = 0; i < map->Count(); i++ )
    {
	s.Clear();
	quote = 0;

	l = map->GetLeft( i );
	t = map->GetType( i );

	if( l->Contains( StrRef( " " ) ) )
	{
	    quote++;
	    s << "\"";
	}

	switch( t )
	{
	case MapInclude:
	    break;
	case MapExclude:
	    s << "-";
	    break;
	case MapOverlay:
	    s << "+";
	};

	s << l->Text();
	if( quote ) s << "\"";

	rb_ary_push( a, P4Utils::ruby_string( s.Text(), s.Length() ) );
    }
    return a;
}

VALUE
P4MapMaker::Rhs()
{
    VALUE		a = rb_ary_new();
    StrBuf		s;
    const StrPtr *	r;
    int			quote;

    for( int i = 0; i < map->Count(); i++ )
    {
	s.Clear();
	quote = 0;

	r = map->GetRight( i );

	if( r->Contains( StrRef( " " ) ) )
	{
	    quote++;
	    s << "\"";
	}

	s << r->Text();
	if( quote ) s << "\"";

	rb_ary_push( a, P4Utils::ruby_string( s.Text(), s.Length() ) );
    }
    return a;
}

VALUE
P4MapMaker::ToA()
{
    VALUE		a = rb_ary_new();
    StrBuf		s;
    const StrPtr *	l;
    const StrPtr *	r;
    MapType		t;
    int			quote;

    for( int i = 0; i < map->Count(); i++ )
    {
	s.Clear();
	quote = 0;

	l = map->GetLeft( i );
	r = map->GetRight( i );
	t = map->GetType( i );

	if( l->Contains( StrRef( " " ) ) ||
	    r->Contains( StrRef( " " ) ) )
	{
	    quote++;
	    s << "\"";
	}

	switch( t )
	{
	case MapInclude:
	    break;
	case MapExclude:
	    s << "-";
	    break;
	case MapOverlay:
	    s << "+";
	};

	s << l->Text();

	if( quote ) s << "\" \"";
	else s << " ";

	s << r->Text();
	if( quote ) s << "\"";

	rb_ary_push( a, P4Utils::ruby_string( s.Text(), s.Length() ) );
    }
    return a;
}

void
P4MapMaker::Inspect( StrBuf &b )
{
    if( !map->Count() )
    {
	b << "(empty)";
	return;
    }

    const StrPtr *l, *r;
    int	  t;

    b << "\n";

    for( int i = 0; i < map->Count(); i++ )
    {

	l = map->GetLeft( i );
	r = map->GetRight( i );
	t = map->GetType( i );

	b << "\t";
	switch( t )
	{
	case MapExclude:
	    b << "-";
	    break;

	case MapOverlay:
	    b << "+";
	    break;

	case MapInclude:
	    break;
	}

	b << l->Text();
	b << " ";
	b << r->Text();
	b << "\n";
    }
}

//
// Take a single string containing either a half-map, or both halves of
// a mapping and split it in two. If there's only one half of a mapping in
// the input, then l, and r are set to the same value as 'in'. If 'in'
// contains two halves, then they are split.
//
void
P4MapMaker::SplitMapping( const StrPtr &in, StrBuf &l, StrBuf &r )
{
    char *	pos;
    int		quoted = 0;
    int		split = 0;
    StrBuf *	dest = &l;

    pos = in.Text();

    l.Clear();
    r.Clear();

    while( *pos )
    {
	switch( *pos )
	{
	case '"':
	    quoted = !quoted;
	    break;

	case ' ':
	    if( !quoted && !split )
	    {
		// whitespace in the middle. skip it, and start updating
		// the destination
		split = 1;
		dest->Terminate();
		dest = &r;
	    }
	    else if( !quoted )
	    {
		// Trailing space on rhs. ignore
	    }
	    else
	    {
		// Embedded space
		dest->Extend( *pos );
	    }
	    break;

	default:
	    dest->Extend( *pos );
	}
	pos++;
    }
    l.Terminate();
    r.Terminate();

    if( !r.Length() )
	r = l;
}