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use std::collections::HashMap;
pub fn render_template<ES>(escaped_template: &ES, params: HashMap<&'static str, ES>) -> String
where ES: AsRef<str>
{
let mut escaped_template: &str = escaped_template.as_ref();
let mut result = String::new();
for (k, v) in params {
let mut full_key = String::with_capacity(k.len() + 4 );
full_key.push_str("{{");
full_key.push_str(&k[..]);
full_key.push_str("}}");
result = escaped_template.replace(&full_key[..], v.as_ref());
escaped_template = &result[..];
}
result
}
pub trait EscapedString : AsRef<str> + std::fmt::Debug + Send + Sync + 'static {
fn from_unescaped(unescaped_str: &str) -> Self;
fn already_escaped(escaped_str: String) -> Self;
}
#[derive(Debug)]
pub struct HtmlEscapedString(String);
impl EscapedString for HtmlEscapedString {
fn from_unescaped(unescaped_str: &str) -> Self {
HtmlEscapedString(htmlescape::encode_attribute(unescaped_str))
}
fn already_escaped(escaped_str: String) -> Self {
HtmlEscapedString(escaped_str)
}
}
impl HtmlEscapedString {
pub fn len(&self) -> usize {
self.0.len()
}
}
impl AsRef<str> for HtmlEscapedString {
fn as_ref(&self) -> &str {
&(self.0)[..]
}
}
#[derive(Debug)]
pub struct UriEscapedString(String);
impl EscapedString for UriEscapedString {
fn from_unescaped(unescaped_str: &str) -> Self {
UriEscapedString(urlencoding::encode(unescaped_str))
}
fn already_escaped(escaped_str: String) -> Self {
UriEscapedString(escaped_str)
}
}
impl AsRef<str> for UriEscapedString {
fn as_ref(&self) -> &str {
&(self.0)[..]
}
}
#[cfg(test)]
mod tests {
use std::collections::HashMap;
use super::render_template;
struct Escaped(&'static str);
impl AsRef<str> for Escaped {
fn as_ref(&self) -> &str {
self.0
}
}
#[test]
fn handlebars_basic() {
let mut params = HashMap::new();
params.insert("name", Escaped("bob"));
params.insert("value", Escaped("myvalue"));
let output = render_template::<Escaped>(&Escaped("name{{name}}, value{{value}}"), params);
assert_eq!(output, "namebob, valuemyvalue");
}
}