wit_encoder/
use_.rs

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1use std::fmt;
2
3use crate::{Ident, Render};
4
5/// Enable the union of a world with another world
6#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
7#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
8#[cfg_attr(feature = "serde", serde(rename_all = "kebab-case"))]
9pub struct Use {
10    target: Ident,
11    use_names_list: Vec<(Ident, Option<Ident>)>,
12}
13
14impl Use {
15    pub fn new(use_target: impl Into<Ident>) -> Self {
16        Self {
17            target: use_target.into(),
18            use_names_list: vec![],
19        }
20    }
21
22    pub fn target(&self) -> &Ident {
23        &self.target
24    }
25
26    pub fn set_target(&mut self, target: Ident) {
27        self.target = target;
28    }
29
30    // `alias` is a concrete type because of https://github.com/rust-lang/rust/issues/36887
31    pub fn item(&mut self, id: impl Into<Ident>, alias: Option<Ident>) {
32        self.use_names_list
33            .push((id.into(), alias.map(|s| s.into())));
34    }
35
36    pub fn use_names_list(&self) -> &[(Ident, Option<Ident>)] {
37        &self.use_names_list
38    }
39
40    pub fn use_names_list_mut(&mut self) -> &mut Vec<(Ident, Option<Ident>)> {
41        &mut self.use_names_list
42    }
43}
44
45impl Render for Use {
46    fn render(&self, f: &mut fmt::Formatter<'_>, opts: &crate::RenderOpts) -> fmt::Result {
47        let len = self.use_names_list.len();
48
49        write!(f, "{}use {}.{{ ", opts.spaces(), self.target)?;
50        for (i, (id, alias)) in self.use_names_list.iter().enumerate() {
51            if let Some(alias) = alias {
52                write!(f, "{id} as {alias}")?;
53            } else {
54                write!(f, "{id}")?;
55            }
56            if i < len - 1 {
57                write!(f, ", ")?;
58            }
59        }
60        write!(f, " }};\n")?;
61        Ok(())
62    }
63}
wit_encoder/use_.rs

wit_encoder/
use_.rs
