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