57 lines
1.3 KiB
Rust
57 lines
1.3 KiB
Rust
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use std::fmt;
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use crate::db::HirDatabase;
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pub struct HirFormatter<'a, 'b, DB> {
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pub db: &'a DB,
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fmt: &'a mut fmt::Formatter<'b>,
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}
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pub trait HirDisplay {
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fn hir_fmt(&self, f: &mut HirFormatter<impl HirDatabase>) -> fmt::Result;
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fn display<'a, DB>(&'a self, db: &'a DB) -> HirDisplayWrapper<'a, DB, Self>
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where
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Self: Sized,
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{
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HirDisplayWrapper(db, self)
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}
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}
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impl<'a, 'b, DB> HirFormatter<'a, 'b, DB>
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where
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DB: HirDatabase,
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{
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pub fn write_joined<T: HirDisplay>(
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&mut self,
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iter: impl IntoIterator<Item = T>,
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sep: &str,
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) -> fmt::Result {
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let mut first = true;
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for e in iter {
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if !first {
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write!(self, "{}", sep)?;
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}
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first = false;
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e.hir_fmt(self)?;
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}
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Ok(())
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}
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/// This allows using the `write!` macro directly with a `HirFormatter`.
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pub fn write_fmt(&mut self, args: fmt::Arguments) -> fmt::Result {
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fmt::write(self.fmt, args)
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}
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}
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pub struct HirDisplayWrapper<'a, DB, T>(&'a DB, &'a T);
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impl<'a, DB, T> fmt::Display for HirDisplayWrapper<'a, DB, T>
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where
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DB: HirDatabase,
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T: HirDisplay,
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{
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.1.hir_fmt(&mut HirFormatter { db: self.0, fmt: f })
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}
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}
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