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import gdb
from .error_code import KstdErrorCodePrinter
class KstdResultPrinter(gdb.ValuePrinter):
def __init__(self, val):
self.__val = val
self.__has_value = bool(val["_M_has_value"])
try:
t = val.type.template_argument(0)
self.__is_void = t.code == gdb.TYPE_CODE_VOID
except (gdb.error, AttributeError):
self.__is_void = False
@property
def _error_code(self):
return self.__val["_M_unex"]
@property
def _value(self):
return self.__val["_M_val"]
def _format_value(self, gdb_value):
printer = gdb.default_visualizer(gdb_value)
if printer is not None:
return printer.to_string()
s = str(gdb_value)
if s.startswith("{"):
return str(gdb_value.type.strip_typedefs())
return s
def _format_error(self, error_code_val):
printer = KstdErrorCodePrinter(error_code_val)
return printer.to_string()
def to_string(self):
if not self.__has_value:
return f"failure: {self._format_error(self._error_code)}"
if self.__is_void:
return "success"
return f"success: {self._format_value(self._value)}"
def children(self):
if not self.__has_value:
yield ("error", self._error_code)
elif not self.__is_void:
yield ("value", self._value)
def display_hint(self):
return None
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