lUInt32 LVCssSelector::getHash()
{
lUInt32 hash = 0;
lUInt32 nextHash = 0;
if (_next)
nextHash = _next->getHash();
for (LVCssSelectorRule * p = _rules; p; p = p->getNext()) {
lUInt32 ruleHash = p->getHash();
hash = hash * 31 + ruleHash;
}
hash = hash * 31 + nextHash;
if (!_decl.isNull())
hash = hash * 31 + _decl->getHash();
return hash;
}
bool LVCssSelector::check( const ldomNode * node ) const
{
// check main Id
if (_id!=0 && node->getNodeId() != _id)
return false;
if (!_rules)
return true;
// check additional rules
const ldomNode * n = node;
LVCssSelectorRule * rule = _rules;
do
{
if ( !rule->check(n) )
return false;
rule = rule->getNext();
} while (rule!=NULL);
return true;
}
bool LVCssSelector::parse( const char * &str, lxmlDocBase * doc )
{
if (!str || !*str)
return false;
for (;;)
{
skip_spaces( str );
if ( *str == '*' ) // universal selector
{
str++;
skip_spaces( str );
_id = 0;
}
else if ( *str == '.' ) // classname follows
{
_id = 0;
}
else if ( css_is_alpha( *str ) )
{
// ident
char ident[64];
if (!parse_ident( str, ident ))
return false;
_id = doc->getElementNameIndex( lString16(ident).c_str() );
skip_spaces( str );
}
else
{
return false;
}
if ( *str == ',' || *str == '{' )
return true;
// one or more attribute rules
bool attr_rule = false;
while ( *str == '[' || *str=='.' || *str=='#' )
{
LVCssSelectorRule * rule = parse_attr( str, doc );
if (!rule)
return false;
insertRuleStart( rule ); //insertRuleAfterStart
//insertRuleAfterStart( rule ); //insertRuleAfterStart
/*
if ( _id!=0 ) {
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_parent);
rule->setId(_id);
insertRuleStart( rule );
_id=0;
}
*/
skip_spaces( str );
attr_rule = true;
//continue;
}
// element relation
if (*str == '>')
{
str++;
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_parent);
rule->setId(_id);
insertRuleStart( rule );
_id=0;
continue;
}
else if (*str == '+')
{
str++;
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_predecessor);
rule->setId(_id);
insertRuleStart( rule );
_id=0;
continue;
}
else if (css_is_alpha( *str ))
{
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_ancessor);
rule->setId(_id);
insertRuleStart( rule );
_id=0;
continue;
}
if ( !attr_rule )
return false;
else if ( *str == ',' || *str == '{' )
return true;
}
}
LVCssSelectorRule * parse_attr( const char * &str, lxmlDocBase * doc )
{
char attrname[512];
char attrvalue[512];
LVCssSelectorRuleType st = cssrt_universal;
if (*str=='.') {
// E.class
str++;
skip_spaces( str );
if (!parse_ident( str, attrvalue ))
return NULL;
skip_spaces( str );
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_class);
lString16 s( attrvalue );
s.lowercase();
rule->setAttr(attr_class, s);
return rule;
} else if ( *str=='#' ) {
// E#id
str++;
skip_spaces( str );
if (!parse_ident( str, attrvalue ))
return NULL;
skip_spaces( str );
LVCssSelectorRule * rule = new LVCssSelectorRule(cssrt_id);
lString16 s( attrvalue );
rule->setAttr(attr_id, s);
return rule;
} else if (*str != '[')
return NULL;
str++;
skip_spaces( str );
if (!parse_ident( str, attrname ))
return NULL;
skip_spaces( str );
attrvalue[0] = 0;
if (*str==']')
{
st = cssrt_attrset;
str++;
}
else if (*str=='=')
{
str++;
if (!parse_attr_value( str, attrvalue))
return NULL;
st = cssrt_attreq;
}
else if (*str=='~' && str[1]=='=')
{
str+=2;
if (!parse_attr_value( str, attrvalue))
return NULL;
st = cssrt_attrhas;
}
else if (*str=='|' && str[1]=='=')
{
str+=2;
if (!parse_attr_value( str, attrvalue))
return NULL;
st = cssrt_attrstarts;
}
else
{
return NULL;
}
LVCssSelectorRule * rule = new LVCssSelectorRule(st);
lString16 s( attrvalue );
lUInt16 id = doc->getAttrNameIndex( lString16(attrname).c_str() );
rule->setAttr(id, s);
return rule;
}