private bool Match()
{
if (this.originalStatements.get_Count() == 0)
{
return(false);
}
if (!this.methodContext.get_Method().IsAsync(out this.stateMachineTypeDef) && !this.methodContext.get_Method().HasAsyncAttributes() || !this.IsAsyncFirstAssignmentStatement(this.originalStatements.get_Item(0), out this.stateMachineTypeDef) || !this.methodContext.get_Method().HasAsyncStateMachineVariable())
{
return(false);
}
if (!this.GetBuilderField())
{
return(false);
}
this.asyncStatements = this.GetMoveNextStatements();
if (this.asyncStatements == null || !this.TryRemoveOuterTryCatch(this.asyncStatements))
{
return(false);
}
this.SetParameterMappings(this.originalStatements);
this.matcherState = 0;
this.asyncStatements = (StatementCollection)this.Visit(this.asyncStatements);
if (this.matcherState == RebuildAsyncStatementsStep.MatcherState.FindAwaitExpression)
{
return(true);
}
return(this.matcherState == 4);
}
public override ICodeNode VisitBinaryExpression(BinaryExpression node)
{
if (node.get_Operator() == 26)
{
if (node.get_Left().get_CodeNodeType() == 26 && this.asyncData.get_AwaiterVariables().Contains((node.get_Left() as VariableReferenceExpression).get_Variable()))
{
V_0 = (node.get_Left() as VariableReferenceExpression).get_Variable();
if (node.get_Right().get_CodeNodeType() != 19 || !String.op_Equality((node.get_Right() as MethodInvocationExpression).get_MethodExpression().get_Method().get_Name(), "GetAwaiter"))
{
if (node.get_Right().get_CodeNodeType() == 40 || node.get_Right().get_CodeNodeType() == 22 && (node.get_Right() as LiteralExpression).get_Value() == null && this.matcherState & 4 == 4 && (object)this.currentAwaiterVariable == (object)V_0)
{
this.matcherState = this.matcherState ^ 4;
return(null);
}
}
else
{
V_1 = null;
V_2 = node.get_Right() as MethodInvocationExpression;
if (V_2.get_MethodExpression().get_Target() == null)
{
if (V_2.get_Arguments().get_Count() == 1)
{
V_1 = (Expression)this.Visit(V_2.get_Arguments().get_Item(0));
}
}
else
{
if (V_2.get_Arguments().get_Count() == 0)
{
V_1 = (Expression)this.Visit(V_2.get_MethodExpression().get_Target());
}
}
if (V_1 != null && this.matcherState == RebuildAsyncStatementsStep.MatcherState.FindAwaitExpression || this.matcherState == 4)
{
this.currentAwaiterVariable = V_0;
this.awaitedExpression = V_1;
this.matcherState = 1;
return(null);
}
}
this.matcherState = 8;
return(node);
}
if (node.get_Left().get_CodeNodeType() == 30 && (object)(node.get_Left() as FieldReferenceExpression).get_Field().Resolve() == (object)this.asyncData.get_StateField() || node.get_Right().get_CodeNodeType() == 28)
{
return(null);
}
}
return(this.VisitBinaryExpression(node));
}
public override ICodeNode VisitPropertyReferenceExpression(PropertyReferenceExpression node)
{
V_0 = node.get_MethodExpression();
if (V_0.get_Target() == null || V_0.get_Target().get_CodeNodeType() != 26 || !this.asyncData.get_AwaiterVariables().Contains((V_0.get_Target() as VariableReferenceExpression).get_Variable()))
{
return(this.VisitPropertyReferenceExpression(node));
}
V_1 = (V_0.get_Target() as VariableReferenceExpression).get_Variable();
if ((object)this.currentAwaiterVariable == (object)V_1 && String.op_Equality(V_0.get_Method().get_Name(), "get_IsCompleted") && this.matcherState == 1)
{
this.matcherState = 6;
return(null);
}
this.matcherState = 8;
return(node);
}
public override ICodeNode VisitMethodInvocationExpression(MethodInvocationExpression node)
{
V_0 = node.get_MethodExpression();
if (V_0.get_Target() != null)
{
if (V_0.get_Target().get_CodeNodeType() == 26 && this.asyncData.get_AwaiterVariables().Contains((V_0.get_Target() as VariableReferenceExpression).get_Variable()))
{
V_1 = (V_0.get_Target() as VariableReferenceExpression).get_Variable();
if ((object)this.currentAwaiterVariable == (object)V_1)
{
if (!String.op_Equality(V_0.get_Method().get_Name(), "get_IsCompleted"))
{
if (String.op_Equality(V_0.get_Method().get_Name(), "GetResult") && this.matcherState & 2 == 2)
{
this.matcherState = this.matcherState ^ 2;
return(new AwaitExpression((Expression)this.Visit(this.awaitedExpression), V_0.get_Method().get_ReturnType(), node.get_UnderlyingSameMethodInstructions()));
}
}
else
{
if (this.matcherState == 1)
{
this.matcherState = 6;
return(null);
}
}
}
this.matcherState = 8;
return(node);
}
if (V_0.get_Target().get_CodeNodeType() == 30 && (object)(V_0.get_Target() as FieldReferenceExpression).get_Field().Resolve() == (object)this.builderField && String.op_Equality(V_0.get_Method().get_Name(), "SetResult"))
{
if (node.get_Arguments().get_Count() > 0)
{
stackVariable34 = node.get_Arguments().get_Item(0);
}
else
{
stackVariable34 = null;
}
return(new ReturnExpression(stackVariable34, V_0.get_UnderlyingSameMethodInstructions()));
}
}
return(this.VisitMethodInvocationExpression(node));
}
