dbg_pls/
debug_tuple.rs

1use crate::{DebugPls, Formatter};
2
3/// A helper designed to assist with creation of
4/// [`DebugPls`] implementations for tuples.
5///
6/// # Examples
7///
8/// ```rust
9/// use dbg_pls::{pretty, DebugPls, Formatter};
10///
11/// struct Foo(i32, String);
12///
13/// impl DebugPls for Foo {
14///     fn fmt(&self, f: Formatter) {
15///         f.debug_tuple()
16///             .field(&self.0)
17///             .field(&self.1)
18///             .finish()
19///     }
20/// }
21///
22/// let value = Foo(10, "Hello".to_string());
23/// assert_eq!(format!("{}", pretty(&value)), "(10, \"Hello\")");
24/// ```
25pub struct DebugTuple<'a> {
26    formatter: Formatter<'a>,
27    expr: syn::ExprTuple,
28}
29
30impl<'a> DebugTuple<'a> {
31    pub(crate) fn new(formatter: Formatter<'a>) -> Self {
32        DebugTuple {
33            formatter,
34            expr: syn::ExprTuple {
35                attrs: vec![],
36                paren_token: syn::token::Paren::default(),
37                elems: syn::punctuated::Punctuated::new(),
38            },
39        }
40    }
41
42    /// Adds the field to the tuple output.
43    #[must_use]
44    pub fn field(mut self, value: &dyn DebugPls) -> Self {
45        self.expr.elems.push(Formatter::process(value));
46        self
47    }
48
49    /// Closes off the tuple.
50    pub fn finish(self) {
51        self.formatter.write_expr(self.expr);
52    }
53}
dbg_pls/debug_tuple.rs

dbg_pls/
debug_tuple.rs
