mirror of
https://github.com/danog/strum.git
synced 2024-12-04 02:17:56 +01:00
e6a9bf08c4
The default attribute on a tuple like variant now causes the to_string
and display format to use the value of the tuple rather than the name
of the variant.
E.g. Color::Green("lime").to_string() will equal "lime" not "Green"
Fixes: how to round trip Display and EnumString with default="true" #86
BREAKING CHANGE
This changes how Display and ToString cause the following to renders:
```rust
#[strum(default)]
Green(String)
```
To maintain the previous behavior (use the variant name):
```rust
#[strum(default, to_string("Green"))]
Green(String)
```
95 lines
2.1 KiB
Rust
95 lines
2.1 KiB
Rust
use strum::{Display, EnumString};
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#[derive(Debug, Eq, PartialEq, EnumString, Display)]
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enum Color {
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#[strum(to_string = "RedRed")]
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Red,
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#[strum(serialize = "b", to_string = "blue")]
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Blue { hue: usize },
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#[strum(serialize = "y", serialize = "yellow")]
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Yellow,
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#[strum(default)]
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Green(String),
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}
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#[test]
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fn to_blue_string() {
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assert_eq!(String::from("blue"), format!("{}", Color::Blue { hue: 0 }));
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}
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#[test]
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fn test_formatters() {
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assert_eq!(
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String::from(" blue"),
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format!("{:>6}", Color::Blue { hue: 0 })
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);
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assert_eq!(
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String::from("blue "),
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format!("{:<6}", Color::Blue { hue: 0 })
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);
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assert_eq!(
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String::from(" blue "),
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format!("{:^6}", Color::Blue { hue: 0 })
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);
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assert_eq!(String::from("bl"), format!("{:.2}", Color::Blue { hue: 0 }));
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}
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#[test]
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fn to_yellow_string() {
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assert_eq!(String::from("yellow"), format!("{}", Color::Yellow));
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}
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#[test]
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fn to_red_string() {
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assert_eq!(String::from("RedRed"), format!("{}", Color::Red));
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}
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#[test]
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fn to_green_string() {
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assert_eq!(
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String::from("lime"),
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format!("{}", Color::Green("lime".into()))
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);
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}
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#[derive(Debug, Eq, PartialEq, EnumString, Display)]
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enum ColorWithDefaultAndToString {
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#[strum(default, to_string = "GreenGreen")]
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Green(String),
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}
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#[test]
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fn to_green_with_default_and_to_string() {
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assert_eq!(
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String::from("GreenGreen"),
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format!("{}", ColorWithDefaultAndToString::Green("lime".into()))
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);
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}
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#[derive(Display, Debug, Eq, PartialEq)]
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#[strum(serialize_all = "snake_case")]
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enum Brightness {
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DarkBlack,
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Dim {
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glow: usize,
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},
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#[strum(serialize = "bright")]
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BrightWhite,
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}
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#[test]
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fn brightness_to_string() {
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assert_eq!(
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String::from("dark_black"),
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Brightness::DarkBlack.to_string().as_ref()
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);
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assert_eq!(
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String::from("dim"),
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Brightness::Dim { glow: 0 }.to_string().as_ref()
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);
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assert_eq!(
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String::from("bright"),
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Brightness::BrightWhite.to_string().as_ref()
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);
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}
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