stepflow_data/value/
string_value.rs

1use std::borrow::{Borrow, Cow};
2use super::{Value, BaseValue, InvalidValue};
3
4#[derive(Debug, PartialEq, Clone)]
5pub struct StringValue {
6  val: Cow<'static, str>,
7}
8
9impl StringValue {
10  pub fn try_new<STR>(val: STR) -> Result<Self, InvalidValue> 
11      where STR: Into<Cow<'static, str>>
12  {
13    let val = val.into();
14    Self::validate(&val)?;
15    Ok(Self { val })
16  }
17
18  pub fn validate(val: &Cow<'static, str>) -> Result<(), InvalidValue> {
19    if val.is_empty() {
20      return Err(InvalidValue::Empty);
21    }
22    Ok(())
23  }
24
25  pub fn val(&self) -> &str {
26    self.val.borrow()
27  }
28  pub fn boxed(self) -> Box<dyn Value> {
29    Box::new(self)
30  }
31}
32
33define_value_impl!(StringValue);
34
35impl std::str::FromStr for StringValue {
36  type Err = InvalidValue;
37
38  fn from_str(s: &str) -> Result<Self, Self::Err> {
39    StringValue::try_new(s.to_owned())
40  }
41}
42
43
44#[cfg(test)]
45mod tests {
46  use super::{InvalidValue, StringValue};
47
48  #[test]
49  fn test_good_string() {
50    let string_value = StringValue::try_new("hi").unwrap();
51    assert_eq!(string_value.val(), "hi");
52  }
53
54  #[test]
55  fn test_bad_string() {
56    assert_eq!(StringValue::try_new(""), Err(InvalidValue::Empty));
57  }
58
59  #[test]
60  fn test_fromstr() {
61    assert!(matches!("".parse::<StringValue>(), Err(_))); 
62    assert_eq!("valid".parse::<StringValue>().unwrap(), StringValue::try_new("valid").unwrap());
63  }
64}
stepflow_data/value/string_value.rs

stepflow_data/value/
string_value.rs
