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use std::collections::BTreeMap;
#[derive(Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct StringTemplate {
template: String,
vars: BTreeMap<String, String>
}
impl StringTemplate {
pub fn new(template: impl Into<String>) -> Self {
Self {
template: template.into(),
vars: BTreeMap::new(),
}
}
pub fn set(&mut self, key: impl AsRef<str>, replacement: impl Into<String>) {
self.vars.insert(format!("~{{{}}}", key.as_ref()), replacement.into());
}
pub fn format(&self) -> String {
let mut s = self.template.clone();
self.vars.iter().for_each(|(k, v)| {
s = s.replace(k, v);
});
s
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn fmt_test() {
let mut template = StringTemplate::new("hello ~{name2} my name is ~{name}");
template.set("name", "grok");
template.set("name2", "traveler");
assert!(template.format() == "hello traveler my name is grok");
}
}