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use std::fmt::{self, Display};
/// Path to the current value in the input, like `dependencies.serde.typo1`.
#[derive(Copy, Clone)]
pub enum Path<'a> {
Root,
Seq { parent: &'a Path<'a>, index: usize },
Map { parent: &'a Path<'a>, key: &'a str },
Alias { parent: &'a Path<'a> },
Unknown { parent: &'a Path<'a> },
}
impl<'a> Display for Path<'a> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
struct Parent<'a>(&'a Path<'a>);
impl<'a> Display for Parent<'a> {
fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match self.0 {
Path::Root => Ok(()),
path => write!(formatter, "{}.", path),
}
}
}
match self {
Path::Root => formatter.write_str("."),
Path::Seq { parent, index } => write!(formatter, "{}[{}]", parent, index),
Path::Map { parent, key } => write!(formatter, "{}{}", Parent(parent), key),
Path::Alias { parent } => write!(formatter, "{}", parent),
Path::Unknown { parent } => write!(formatter, "{}?", Parent(parent)),
}
}
}