public void VisitTry(TryStatement t)
{
CodeVariableReferenceExpression?successVar = null;
if (t.elseHandler != null)
{
// C# has no equivalent to Python's else handler, so we have
// to emulate it with a boolean flag.
successVar = gensym.GenSymLocal("_success", gen.TypeRef(typeof(bool)));
gen.Assign(successVar, gen.Prim(false));
}
var tryStmt = gen.Try(
() => {
t.body.Accept(this);
if (successVar != null)
{
gen.Assign(successVar, gen.Prim(true));
}
},
t.exHandlers.Select(eh => GenerateClause(eh)),
() =>
{
if (t.finallyHandler != null)
{
t.finallyHandler.Accept(this);
}
});
if (successVar != null)
{
gen.If(successVar,
() => t.elseHandler !.Accept(this));
}
}
private CodeExpression FuseComparisons(CodeBinaryOperatorExpression binL, Op op, CodeExpression r)
{
if (binL.Right is not CodeVariableReferenceExpression variable)
{
// Python https://docs.python.org/3/reference/expressions.html#comparisons
// Stats that the second expression in a comparison chain is only evaluated once.
variable = gensym.GenSymLocal("_tmp_", m.TypeRef(typeof(object)));
m.Assign(variable, binL.Right);
binL = m.BinOp(binL.Left, binL.Operator, variable);
}
var newR = m.BinOp(variable, mppyoptocsop[op], r);
return(m.BinOp(binL, CodeOperatorType.LogAnd, newR));
}
private CodeVariableReferenceExpression GenSymLocalTuple()
{
return(gensym.GenSymLocal("_tup_", new CodeTypeReference(typeof(object))));
}