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use stepflow_base::{ObjectStoreContent, IdError, generate_id_type};
use super::InvalidValue;
use super::value::Value;
generate_id_type!(VarId);
pub trait Var: std::fmt::Debug + stepflow_base::as_any::AsAny {
fn id(&self) -> &VarId;
fn value_from_str(&self, s: &str) -> Result<Box<dyn Value>, InvalidValue>;
fn validate_val_type(&self, val: &Box<dyn Value>) -> Result<(), InvalidValue>;
}
impl dyn Var + Send + Sync {
pub fn downcast<T>(&self) -> Option<&T>
where T: Var + std::any::Any
{
self.as_any().downcast_ref::<T>()
}
pub fn is<T>(&self) -> bool
where T: Var + std::any::Any
{
self.as_any().is::<T>()
}
}
impl ObjectStoreContent for Box<dyn Var + Sync + Send> {
type IdType = VarId;
fn new_id(id_val: u32) -> Self::IdType {
VarId::new(id_val)
}
fn id(&self) -> &Self::IdType {
self.as_ref().id()
}
}
macro_rules! define_var {
($name:ident, $valuetype:ident) => {
#[derive(Debug)]
pub struct $name {
id: VarId,
}
impl $name {
pub fn new(id: VarId) -> Self {
Self { id }
}
pub fn boxed(self) -> Box<dyn Var + Send + Sync> {
Box::new(self)
}
}
impl Var for $name {
fn id(&self) -> &VarId { &self.id }
fn value_from_str(&self, s: &str) -> Result<Box<dyn Value>, InvalidValue> {
Ok(Box::new(s.parse::<$valuetype>()?) as Box<dyn Value>)
}
fn validate_val_type(&self, val: &Box<dyn Value>) -> Result<(), InvalidValue> {
if val.is::<$valuetype>() {
Ok(())
} else {
Err(InvalidValue::WrongType)
}
}
}
};
}
use super::value::EmailValue;
define_var!(EmailVar, EmailValue);
use super::value::StringValue;
define_var!(StringVar, StringValue);
use super::value::TrueValue;
define_var!(TrueVar, TrueValue);
use super::value::UriValue;
define_var!(UriVar, UriValue);
use super::value::BoolValue;
define_var!(BoolVar, BoolValue);
#[cfg(test)]
pub fn test_var_val() -> (Box<dyn Var + Send + Sync>, Box<dyn Value>) {
let var = Box::new(StringVar::new(stepflow_test_util::test_id!(VarId)));
let val: Box<dyn Value> = StringValue::try_new("test".to_owned()).unwrap().boxed();
(var, val)
}
#[cfg(test)]
mod tests {
use stepflow_test_util::test_id;
use crate::value::{Value, StringValue, EmailValue};
use super::{Var, VarId, EmailVar, StringVar, UriVar, InvalidValue};
#[test]
fn validate_val_type() {
let email_addr = "is@email.com";
let email_var = EmailVar::new(test_id!(VarId));
let email_strval: Box<dyn Value> = StringValue::try_new(email_addr.to_owned()).unwrap().boxed();
let email_emailval: Box<dyn Value> = EmailValue::try_new(email_addr.to_owned()).unwrap().boxed();
assert!(matches!(email_var.validate_val_type(&email_strval), Err(InvalidValue::WrongType)));
assert!(matches!(email_var.validate_val_type(&email_emailval), Ok(())));
}
#[test]
fn downcast() {
let stringvar = StringVar::new(test_id!(VarId));
let stringvar_boxed = stringvar.boxed();
assert!(matches!(stringvar_boxed.as_any().downcast_ref::<StringVar>(), Some(_)));
assert!(matches!(stringvar_boxed.as_any().downcast_ref::<UriVar>(), None));
assert!(matches!(stringvar_boxed.downcast::<StringVar>(), Some(_)));
assert_eq!(stringvar_boxed.is::<StringVar>(), true);
assert!(matches!(stringvar_boxed.downcast::<UriVar>(), None));
assert_eq!(stringvar_boxed.is::<UriVar>(), false);
}
}