double
Feature::eval( NumericExpression& expr, FilterContext const* context ) const
{
const NumericExpression::Variables& vars = expr.variables();
for( NumericExpression::Variables::const_iterator i = vars.begin(); i != vars.end(); ++i )
{
double val = 0.0;
AttributeTable::const_iterator ai = _attrs.find(toLower(i->first));
if (ai != _attrs.end())
{
val = ai->second.getDouble(0.0);
}
else if (context)
{
//No attr found, look for script
ScriptEngine* engine = context->getSession()->getScriptEngine();
if (engine)
{
ScriptResult result = engine->run(i->first, this, context);
if (result.success())
val = result.asDouble();
else
OE_WARN << LC << "Script error:" << result.message() << std::endl;
}
}
expr.set( *i, val); //osgEarth::as<double>(getAttr(i->first),0.0) );
}
return expr.eval();
}
const std::string&
Feature::eval( StringExpression& expr, FilterContext const* context ) const
{
const StringExpression::Variables& vars = expr.variables();
for( StringExpression::Variables::const_iterator i = vars.begin(); i != vars.end(); ++i )
{
std::string val = "";
AttributeTable::const_iterator ai = _attrs.find(toLower(i->first));
if (ai != _attrs.end())
{
val = ai->second.getString();
}
else if (context)
{
//No attr found, look for script
ScriptEngine* engine = context->getSession()->getScriptEngine();
if (engine)
{
ScriptResult result = engine->run(i->first, this, context);
if (result.success())
val = result.asString();
else
OE_WARN << LC << "Feature Script error on '" << expr.expr() << "': " << result.message() << std::endl;
}
}
expr.set( *i, val );
}
return expr.eval();
}
JavascriptEngineV8::JavascriptEngineV8(const ScriptEngineOptions& options)
: ScriptEngine(options)
{
_isolate = v8::Isolate::New();
v8::Locker locker(_isolate);
v8::Isolate::Scope isolate_scope(_isolate);
v8::HandleScope handle_scope(_isolate);
_globalContext.Reset(_isolate, createGlobalContext());
if (options.script().isSet() && !options.script()->getCode().empty())
{
// Create a nested handle scope
v8::HandleScope local_handle_scope(_isolate);
// Enter the global context
v8::Local<v8::Context> globalContext = *reinterpret_cast<v8::Local<v8::Context>*>(&_globalContext);
v8::Context::Scope context_scope(globalContext);
// Compile and run the script
ScriptResult result = executeScript(v8::String::New(options.script()->getCode().c_str(), options.script()->getCode().length()));
if (!result.success())
OE_WARN << LC << "Error reading javascript: " << result.message() << std::endl;
}
}