libvirt/scripts/rpcgen/rpcgen/visitor.py
Daniel P. Berrangé 518af85344 rpcgen: define a visitor API for XDR protocol specs
The visitor API defines an interface for visiting each element
in the XDR protocol spec abstract syntax tree.

Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2023-11-03 14:06:35 -04:00

157 lines
4.1 KiB
Python

# SPDX-License-Identifier: LGPL-2.1-or-later
import abc
from .ast import (
XDRSpecification,
XDRDefinition,
XDRDeclaration,
XDRType,
XDREnumValue,
XDREnumBody,
XDRStructBody,
XDRUnionCase,
XDRUnionBody,
)
class XDRVisitor(abc.ABC):
def __init__(self, spec):
self.spec = spec
def visit(self, indent="", context=""):
return self.visit_object(self.spec, indent="", context=context)
def visit_object(self, obj, indent="", context=""):
if isinstance(obj, XDRSpecification):
funcname = "visit_specification"
elif isinstance(obj, XDRDefinition):
funcname = "visit_definition_" + type(obj).__name__[13:].lower()
elif isinstance(obj, XDRDeclaration):
funcname = "visit_declaration_" + type(obj).__name__[14:].lower()
elif isinstance(obj, XDRType):
funcname = "visit_type_" + type(obj).__name__[7:].lower()
elif isinstance(obj, XDREnumValue):
funcname = "visit_enum_value"
elif isinstance(obj, XDREnumBody):
funcname = "visit_enum_body"
elif isinstance(obj, XDRStructBody):
funcname = "visit_struct_body"
elif isinstance(obj, XDRUnionCase):
funcname = "visit_union_case"
elif isinstance(obj, XDRUnionBody):
funcname = "visit_union_body"
else:
raise Exception("Unhandled %s" % obj.__class__.__name__)
func = getattr(self, funcname)
assert func is not None
return func(obj, indent, context)
def visit_specification(self, obj, indent, context):
code = []
for definition in self.spec.definitions:
defcode = self.visit_object(definition, indent, context)
if defcode is not None:
code.append(defcode)
return "\n".join(code)
def visit_definition_cescape(self, obj, indent, context):
pass
def visit_definition_constant(self, obj, indent, context):
pass
def visit_definition_enum(self, obj, indent, context):
pass
def visit_definition_struct(self, obj, indent, context):
pass
def visit_definition_union(self, obj, indent, context):
pass
def visit_definition_typedef(self, obj, indent, context):
pass
def visit_declaration_scalar(self, obj, indent, context):
pass
def visit_declaration_pointer(self, obj, indent, context):
pass
def visit_declaration_fixedarray(self, obj, indent, context):
pass
def visit_declaration_variablearray(self, obj, indent, context):
pass
def visit_type_custom(self, obj, indent, context):
pass
def visit_type_opaque(self, obj, indent, context):
pass
def visit_type_string(self, obj, indent, context):
pass
def visit_type_void(self, obj, indent, context):
pass
def visit_type_char(self, obj, indent, context):
pass
def visit_type_unsignedchar(self, obj, indent, context):
pass
def visit_type_short(self, obj, indent, context):
pass
def visit_type_unsignedshort(self, obj, indent, context):
pass
def visit_type_int(self, obj, indent, context):
pass
def visit_type_unsignedint(self, obj, indent, context):
pass
def visit_type_hyper(self, obj, indent, context):
pass
def visit_type_unsignedhyper(self, obj, indent, context):
pass
def visit_type_bool(self, obj, indent, context):
pass
def visit_type_float(self, obj, indent, context):
pass
def visit_type_double(self, obj, indent, context):
pass
def visit_type_enum(self, obj, indent, context):
pass
def visit_type_struct(self, obj, indent, context):
pass
def visit_type_union(self, obj, indent, context):
pass
def visit_enum_value(self, obj, indent, context):
pass
def visit_enum_body(self, obj, indent, context):
pass
def visit_struct_body(self, obj, indent, context):
pass
def visit_union_case(self, obj, indent, context):
pass
def visit_union_body(self, obj, indent, context):
pass