128 lines
3.6 KiB
Rust
128 lines
3.6 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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use std::collections::HashSet;
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/// Track which blocks of code are to be skipped when formatting.
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///
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/// You can update it by:
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///
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/// - attributes slice
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/// - manually feeding values into the underlying contexts
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///
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/// Query this context to know if you need to skip a block.
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#[derive(Default, Clone)]
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pub(crate) struct SkipContext {
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pub(crate) macros: SkipNameContext,
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pub(crate) attributes: SkipNameContext,
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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.extend(get_skip_names("macros", attrs));
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self.attributes.extend(get_skip_names("attributes", attrs));
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}
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pub(crate) fn update(&mut self, other: SkipContext) {
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let SkipContext { macros, attributes } = other;
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self.macros.update(macros);
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self.attributes.update(attributes);
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}
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}
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/// Track which names to skip.
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///
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/// Query this context with a string to know whether to skip it.
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#[derive(Clone)]
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pub(crate) enum SkipNameContext {
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All,
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Values(HashSet<String>),
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}
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impl Default for SkipNameContext {
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fn default() -> Self {
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Self::Values(Default::default())
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}
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}
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impl Extend<String> for SkipNameContext {
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fn extend<T: IntoIterator<Item = String>>(&mut self, iter: T) {
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match self {
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Self::All => {}
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Self::Values(values) => values.extend(iter),
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}
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}
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}
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impl SkipNameContext {
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pub(crate) fn update(&mut self, other: Self) {
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match (self, other) {
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// If we're already skipping everything, nothing more can be added
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(Self::All, _) => {}
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// If we want to skip all, set it
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(this, Self::All) => {
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*this = Self::All;
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}
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// If we have some new values to skip, add them
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(Self::Values(existing_values), Self::Values(new_values)) => {
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existing_values.extend(new_values)
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}
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}
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}
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pub(crate) fn skip(&self, name: &str) -> bool {
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match self {
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Self::All => true,
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Self::Values(values) => values.contains(name),
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}
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}
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pub(crate) fn skip_all(&mut self) {
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*self = Self::All;
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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(normal) = &attr.kind {
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if pprust::path_to_string(&normal.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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