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This commit is contained in:
Sergey Pepyakin
2017-11-26 00:29:33 +03:00
parent ea980415f6
commit ea6275cc9d
9 changed files with 82 additions and 114 deletions
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60
src/interpreter/mod.rs
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@ -5,27 +5,30 @@ use std::any::TypeId;
/// Custom user error.
pub trait UserError: 'static + ::std::fmt::Display + ::std::fmt::Debug {
#[doc(hidden)]
fn __private_get_type_id__(&self) -> TypeId {
TypeId::of::<Self>()
}
fn __private_get_type_id__(&self) -> TypeId {
TypeId::of::<Self>()
}
}
impl UserError {
/// Attempt to downcast this `UserError` to a concrete type by reference.
pub fn downcast_ref<T: UserError>(&self) -> Option<&T> {
if self.__private_get_type_id__() == TypeId::of::<T>() {
unsafe { Some(&*(self as *const UserError as *const T)) }
} else {
None
}
}
if self.__private_get_type_id__() == TypeId::of::<T>() {
unsafe { Some(&*(self as *const UserError as *const T)) }
} else {
None
}
}
/// Attempt to downcast this `UserError` to a concrete type by mutable
/// reference.
pub fn downcast_mut<T: UserError>(&mut self) -> Option<&mut T> {
if self.__private_get_type_id__() == TypeId::of::<T>() {
unsafe { Some(&mut *(self as *mut UserError as *mut T)) }
} else {
None
}
}
unsafe { Some(&mut *(self as *mut UserError as *mut T)) }
} else {
None
}
}
}
/// Internal interpreter error.
@ -111,16 +114,6 @@ impl ::std::fmt::Display for Error {
}
}
/// Dummy user error.
#[derive(Debug, Clone, PartialEq)]
pub struct DummyUserError;
impl UserError for DummyUserError {}
impl ::std::fmt::Display for DummyUserError {
fn fmt(&self, _f: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> { Ok(()) }
}
impl<U> From<U> for Error where U: UserError + Sized {
fn from(e: U) -> Self {
Error::User(Box::new(e))
@ -152,22 +145,3 @@ pub use self::value::RuntimeValue;
pub use self::variable::{VariableInstance, VariableType, ExternalVariableValue};
pub use self::env_native::{env_native_module, UserDefinedElements, UserFunctionExecutor, UserFunctionDescriptor};
pub use self::env::EnvParams;
/// Default type of Error if you do not need any custom user errors.
#[deprecated]
pub type DummyError = Error;
/// Default type of ProgramInstance if you do not need any custom user errors.
/// To work with custom user errors or interpreter internals, use CustomProgramInstance.
#[deprecated]
pub type DefaultProgramInstance = self::program::ProgramInstance;
/// Default type of ModuleInstance if you do not need any custom user errors.
/// To work with custom user errors or interpreter internals, use CustomModuleInstance.
#[deprecated]
pub type DefaultModuleInstance = self::module::ModuleInstance;
/// Default type of ModuleInstanceInterface if you do not need any custom user errors.
/// To work with custom user errors or interpreter internals, use CustomModuleInstanceInterface.
#[deprecated]
pub type DefaultModuleInstanceInterface = self::module::ModuleInstanceInterface;