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use std::fmt::{self, Write};
use crate::formatter::Formatter;
/// Defines a type.
#[derive(Debug, Clone)]
pub struct Type {
/// The name of the type.
name: String,
/// The type's generics.
generics: Vec<Type>,
}
impl Type {
/// Return a new type with the given name.
///
/// # Arguments
///
/// * `name` - The name of the type.
///
/// # Examples
///
/// ```
/// use rust_codegen::Type;
///
/// let foo_type = Type::new("Foo");
/// ```
pub fn new(name: &str) -> Self {
Type {
name: name.to_string(),
generics: vec![],
}
}
/// Add a generic to the type.
///
/// # Arguments
///
/// * `ty` - The generic to add to the type.
///
/// # Examples
///
/// ```
/// use rust_codegen::Type;
///
/// let mut foo_type = Type::new("Foo");
/// foo_type.generic("T");
/// ```
pub fn generic<T>(&mut self, ty: T) -> &mut Self
where
T: Into<Type>,
{
// Make sure that the name doesn't already include generics
assert!(
!self.name.contains("<"),
"type name already includes generics"
);
self.generics.push(ty.into());
self
}
/// Formats the struct using the given formatter.
///
/// # Examples
///
/// ```
/// use rust_codegen::{Formatter,Type};
///
/// let mut dest = String::new();
/// let mut fmt = Formatter::new(&mut dest);
///
/// let mut foo_type = Type::new("Foo");
/// foo_type.fmt(&mut fmt);
pub fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
write!(fmt, "{}", self.name)?;
Type::fmt_slice(&self.generics, fmt)
}
/// Formats the type using the given formatter with the given generics.
///
/// # Arguments
///
/// * `generics` - The generics to use.
/// * `fmt` - The formatter to use.
fn fmt_slice(generics: &[Type], fmt: &mut Formatter<'_>) -> fmt::Result {
if !generics.is_empty() {
write!(fmt, "<")?;
for (i, ty) in generics.iter().enumerate() {
if i != 0 {
write!(fmt, ", ")?
}
ty.fmt(fmt)?;
}
write!(fmt, ">")?;
}
Ok(())
}
}
impl<'a> From<&'a str> for Type {
fn from(src: &'a str) -> Self {
Type::new(src)
}
}
impl From<String> for Type {
fn from(src: String) -> Self {
Type {
name: src,
generics: vec![],
}
}
}
impl<'a> From<&'a String> for Type {
fn from(src: &'a String) -> Self {
Type::new(src)
}
}
impl<'a> From<&'a Type> for Type {
fn from(src: &'a Type) -> Self {
src.clone()
}
}