Dynamic Formatting README

Simple, dynamic, Python-styled string formatting (Only support String, {key} patterns).

Escape like {{ or }}.

Install

cargo add dyn_formatting@2.0.0

Errors

1. Raise DynamicFormatError::KeyError while the key in the brackets is not found in dictionary.
2. Raise DynamicFormatError::TokenError while there is any unmatched bracket ({ or })

Examples

use dyn_formatting::dynamic_format;
assert_eq!(
    dynamic_format(
        "I'm {name}. I'm {age} years old now.",
        &[("name", "ABC"), ("age", "20")].into()
    ).unwrap(),
    "I'm ABC. I'm 20 years old now.".to_string()
);

use dyn_formatting::dynamic_format;
use std::collections::HashMap;
let value_age = (15).to_string(); // Make lifetime long enough
let dictionary = HashMap::from([
    ("age", value_age.as_str()),
]);
assert_eq!(
    dynamic_format("{{{age} }}{age}", &dictionary).unwrap(),
    "{15 }15"
)

use dyn_formatting::dynamic_format;
assert!(
    dynamic_format(
        "I'm {name}. I'm {age} years old now.",
        &[("name", "ABC")].into()
    ).is_err() // Key error
);

use dyn_formatting::dynamic_format;
assert!(
    dynamic_format(
        "I'm {name{name}}.",
        &[("name", "ABC")].into()
    ).is_err() // Token error: '{' unmatched.
);