def parse(cls, caseNode: Iir, choices: Iterable[SequentialChoice], label: str) -> "Case":
from pyGHDL.dom._Translate import GetSequentialStatementsFromChainedNodes
statementChain = nodes.Get_Associated_Chain(caseNode)
statements = GetSequentialStatementsFromChainedNodes(statementChain, "case", label)
return cls(caseNode, choices, statements)
def sequential_iter(n) -> Generator[Any, None, None]:
"""
Iterate sequential statements. The first node must be either
a process or a subprogram body.
"""
if n == nodes.Null_Iir:
return
k = nodes.Get_Kind(n)
if k in (
nodes.Iir_Kind.Process_Statement,
nodes.Iir_Kind.Sensitized_Process_Statement,
nodes.Iir_Kind.Function_Body,
nodes.Iir_Kind.Procedure_Body,
):
for n1 in chain_iter(nodes.Get_Sequential_Statement_Chain(n)):
yield n1
for n2 in sequential_iter(n1):
yield n2
elif k == nodes.Iir_Kind.If_Statement:
while True:
n = nodes.Get_Chain(n)
if n == nodes.Null_Iir:
break
yield n
for n1 in sequential_iter(n):
yield n1
elif k == nodes.Iir_Kind.Case_Statement:
for ch in chain_iter(nodes.Get_Case_Statement_Alternative_Chain(n)):
stmt = nodes.Get_Associated_Chain(ch)
if stmt != nodes.Null_Iir:
for n1 in chain_iter(stmt):
yield n1
for n2 in sequential_iter(n1):
yield n2
elif k in [
nodes.Iir_Kind.For_Loop_Statement,
nodes.Iir_Kind.While_Loop_Statement
]:
for n1 in chain_iter(nodes.Get_Sequential_Statement_Chain(n)):
yield n1
for n2 in sequential_iter(n1):
yield n2
elif k in (
nodes.Iir_Kind.Assertion_Statement,
nodes.Iir_Kind.Wait_Statement,
nodes.Iir_Kind.Null_Statement,
nodes.Iir_Kind.Exit_Statement,
nodes.Iir_Kind.Next_Statement,
nodes.Iir_Kind.Return_Statement,
nodes.Iir_Kind.Variable_Assignment_Statement,
nodes.Iir_Kind.Simple_Signal_Assignment_Statement,
nodes.Iir_Kind.Procedure_Call_Statement,
):
return
else:
raise Exception("Unknown node of kind {}".format(kind_image(k)))