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//! Module that contains skip related stuffs.
use rustc_ast::ast;
use rustc_ast_pretty::pprust;
/// Take care of skip name stack. You can update it by attributes slice or
/// by other context. Query this context to know if you need skip a block.
#[derive(Default, Clone)]
pub(crate) struct SkipContext {
macros: Vec<String>,
attributes: Vec<String>,
}
impl SkipContext {
pub(crate) fn update_with_attrs(&mut self, attrs: &[ast::Attribute]) {
self.macros.append(&mut get_skip_names("macros", attrs));
self.attributes
.append(&mut get_skip_names("attributes", attrs));
}
pub(crate) fn update(&mut self, mut other: SkipContext) {
self.macros.append(&mut other.macros);
self.attributes.append(&mut other.attributes);
}
pub(crate) fn skip_macro(&self, name: &str) -> bool {
self.macros.iter().any(|n| n == name)
}
pub(crate) fn skip_attribute(&self, name: &str) -> bool {
self.attributes.iter().any(|n| n == name)
}
}
static RUSTFMT: &str = "rustfmt";
static SKIP: &str = "skip";
/// Say if you're playing with `rustfmt`'s skip attribute
pub(crate) fn is_skip_attr(segments: &[ast::PathSegment]) -> bool {
if segments.len() < 2 || segments[0].ident.to_string() != RUSTFMT {
return false;
}
match segments.len() {
2 => segments[1].ident.to_string() == SKIP,
3 => {
segments[1].ident.to_string() == SKIP
&& ["macros", "attributes"]
.iter()
.any(|&n| n == pprust::path_segment_to_string(&segments[2]))
}
_ => false,
}
}
fn get_skip_names(kind: &str, attrs: &[ast::Attribute]) -> Vec<String> {
let mut skip_names = vec![];
let path = format!("{}::{}::{}", RUSTFMT, SKIP, kind);
for attr in attrs {
// rustc_ast::ast::Path is implemented partialEq
// but it is designed for segments.len() == 1
if let ast::AttrKind::Normal(normal) = &attr.kind {
if pprust::path_to_string(&normal.item.path) != path {
continue;
}
}
if let Some(list) = attr.meta_item_list() {
for nested_meta_item in list {
if let Some(name) = nested_meta_item.ident() {
skip_names.push(name.to_string());
}
}
}
}
skip_names
}
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