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use std::collections::HashMap;
use crate::error::{ParseError, TemplateError};
use crate::funcs::BUILTINS;
use crate::parse::{parse, Tree};
use gtmpl_value::Func;
/// The main template structure.
pub struct Template {
pub name: String,
pub text: String,
pub funcs: HashMap<String, Func>,
pub tree_set: HashMap<String, Tree>,
}
impl Default for Template {
fn default() -> Template {
Template {
name: String::default(),
text: String::from(""),
funcs: BUILTINS.iter().map(|&(k, v)| (k.to_owned(), v)).collect(),
tree_set: HashMap::default(),
}
}
}
impl Template {
/// Creates a new empty template with a given `name`.
pub fn with_name<T: Into<String>>(name: T) -> Template {
Template {
name: name.into(),
..Default::default()
}
}
/// Adds a single custom function to the template.
///
/// ## Example
///
/// ```rust
/// use gtmpl_ng::{Context, Func, FuncError, Value};
///
/// fn hello_world(_args: &[Value]) -> Result<Value, FuncError> {
/// Ok(Value::from("Hello World!"))
/// }
///
/// let mut tmpl = gtmpl_ng::Template::default();
/// tmpl.add_func("helloWorld", hello_world);
/// tmpl.parse("{{ helloWorld }}").unwrap();
/// let output = tmpl.render(&Context::empty());
/// assert_eq!(&output.unwrap(), "Hello World!");
/// ```
pub fn add_func(&mut self, name: &str, func: Func) {
self.funcs.insert(name.to_owned(), func);
}
/// Adds custom functions to the template.
///
/// ## Example
///
/// ```rust
/// use std::collections::HashMap;
///
/// use gtmpl_ng::{Context, Func, FuncError, Value};
///
/// fn hello_world(_args: &[Value]) -> Result<Value, FuncError> {
/// Ok(Value::from("Hello World!"))
/// }
///
/// let funcs = vec![("helloWorld", hello_world as Func)];
/// let mut tmpl = gtmpl_ng::Template::default();
/// tmpl.add_funcs(&funcs);
/// tmpl.parse("{{ helloWorld }}").unwrap();
/// let output = tmpl.render(&Context::empty());
/// assert_eq!(&output.unwrap(), "Hello World!");
/// ```
pub fn add_funcs<T: Into<String> + Clone>(&mut self, funcs: &[(T, Func)]) {
self.funcs
.extend(funcs.iter().cloned().map(|(k, v)| (k.into(), v)));
}
/// Parse the given `text` as template body.
///
/// ## Example
///
/// ```rust
/// let mut tmpl = gtmpl_ng::Template::default();
/// tmpl.parse("Hello World!").unwrap();
/// ```
pub fn parse<T: Into<String>>(&mut self, text: T) -> Result<(), ParseError> {
let tree_set = parse(
self.name.clone(),
text.into(),
self.funcs.keys().cloned().collect(),
)?;
self.tree_set.extend(tree_set);
Ok(())
}
/// Add the given `text` as a template with a `name`.
///
/// ## Example
///
/// ```rust
/// use gtmpl_ng::Context;
///
/// let mut tmpl = gtmpl_ng::Template::default();
/// tmpl.add_template("fancy", "{{ . }}");
/// tmpl.parse(r#"{{ template "fancy" . }}!"#).unwrap();
/// let output = tmpl.render(&Context::from("Hello World"));
/// assert_eq!(&output.unwrap(), "Hello World!");
/// ```
pub fn add_template<N: Into<String>, T: Into<String>>(
&mut self,
name: N,
text: T,
) -> Result<(), TemplateError> {
let tree_set = parse(
name.into(),
text.into(),
self.funcs.keys().cloned().collect(),
)?;
self.tree_set.extend(tree_set);
Ok(())
}
}
#[cfg(test)]
mod tests_mocked {
use super::*;
#[test]
fn test_parse() {
let mut t = Template::with_name("foo");
assert!(t.parse(r#"{{ if eq "bar" "bar" }} 2000 {{ end }}"#).is_ok());
assert!(t.tree_set.contains_key("foo"));
}
}