static System.Func<StringTemplate, IStringTemplateWriter, bool> GetEvaluator( ASTExpr chunk, ITree condition )
{
if ( EnableDynamicMethods )
{
try
{
DynamicMethod method = null;
#if CACHE_FUNCTORS
if ( !_methods.TryGetValue( condition, out method ) )
#endif
{
Type[] parameterTypes = { typeof( ASTExpr ), typeof( StringTemplate ), typeof( IStringTemplateWriter ) };
method = new DynamicMethod( "ConditionEvaluator" + _evaluatorNumber, typeof( bool ), parameterTypes, typeof( ConditionalExpr ), true );
method.DefineParameter( 1, ParameterAttributes.None, "chunk" );
method.DefineParameter( 2, ParameterAttributes.None, "self" );
method.DefineParameter( 3, ParameterAttributes.None, "writer" );
_evaluatorNumber++;
var gen = method.GetILGenerator();
ActionEvaluator evalCompiled = new ActionEvaluator( null, chunk, null, condition );
evalCompiled.ifConditionCompiled( gen );
gen.Emit( OpCodes.Ret );
#if CACHE_FUNCTORS
_methods[condition] = method;
#endif
}
var dynamicEvaluator = (System.Func<StringTemplate, IStringTemplateWriter, bool>)method.CreateDelegate( typeof( System.Func<StringTemplate, IStringTemplateWriter, bool> ), chunk );
return dynamicEvaluator;
}
catch
{
// fall back to functional (or interpreted) version
}
}
if ( EnableFunctionalMethods )
{
try
{
ActionEvaluator evalFunctional = new ActionEvaluator( null, chunk, null, condition );
var functionalEvaluator = evalFunctional.ifConditionFunctional();
HoldsConditionFuncAndChunk holder = new HoldsConditionFuncAndChunk()
{
func = functionalEvaluator,
chunk = chunk
};
return (System.Func<StringTemplate, IStringTemplateWriter, bool>)System.Delegate.CreateDelegate( typeof( System.Func<StringTemplate, IStringTemplateWriter, bool> ), holder, typeof( ConditionalExpr ).GetMethod( "CallFunctionalConditionEvaluator" ) );
}
catch
{
// fall back to interpreted version
}
}
return new System.Func<StringTemplate, IStringTemplateWriter, bool>( ( self, @out ) =>
{
ActionEvaluator eval = new ActionEvaluator( self, chunk, @out, condition );
return eval.ifCondition();
} );
}
public virtual void AddElseIfSubtemplate( ASTExpr conditionalTree,
StringTemplate subtemplate )
{
if ( _elseIfSubtemplates == null )
{
_elseIfSubtemplates = new List<ElseIfClauseData>();
}
ElseIfClauseData d = new ElseIfClauseData()
{
expr = conditionalTree,
st = subtemplate
};
_elseIfSubtemplates.Add( d );
}
