use crate::search::Search;
use crate::Error;
use std::fmt;
use std::str::FromStr;
use syn::{Ident, Item};
#[derive(Debug, Clone)]
pub struct Selector {
segments: Vec<SelectorSegment>,
}
impl Selector {
pub fn try_from(s: impl AsRef<str>) -> Result<Self, Error> {
s.as_ref().parse()
}
pub fn apply_to(&self, file: &syn::File) -> Vec<Item> {
let mut search = Search::new(self);
search.search_file(file);
search.results
}
pub(crate) fn part(&self, index: usize) -> &SelectorSegment {
&self.segments[index]
}
pub(crate) fn len(&self) -> usize {
self.segments.len()
}
}
impl fmt::Display for Selector {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.segments[0])?;
for segment in self.segments.iter().skip(1) {
write!(f, "::{}", segment)?;
}
Ok(())
}
}
impl FromStr for Selector {
type Err = Error;
fn from_str(input: &str) -> Result<Self, Self::Err> {
let mut segments = Vec::new();
if input.trim() == "" {
return Err(Error::empty_path());
}
for segment in input.split("::") {
match segment.parse() {
Ok(seg) => segments.push(seg),
Err(_) => return Err(Error::invalid_segment(segment.into())),
}
}
Ok(Selector { segments })
}
}
#[derive(Debug, Clone)]
pub(crate) enum SelectorSegment {
Ident(String),
Wildcard,
}
impl FromStr for SelectorSegment {
type Err = Error;
fn from_str(input: &str) -> Result<Self, Self::Err> {
if input == "_" {
return Ok(SelectorSegment::Wildcard);
}
syn::parse_str::<Ident>(input)
.map(|ident| SelectorSegment::Ident(ident.to_string()))
.map_err(|_| Error::invalid_segment(input.into()))
}
}
impl PartialEq<Ident> for SelectorSegment {
fn eq(&self, other: &Ident) -> bool {
match self {
SelectorSegment::Wildcard => true,
SelectorSegment::Ident(ident) => other == ident,
}
}
}
impl fmt::Display for SelectorSegment {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match self {
SelectorSegment::Wildcard => "_".fmt(f),
SelectorSegment::Ident(ident) => ident.fmt(f),
}
}
}