106 lines
3.5 KiB
Rust
106 lines
3.5 KiB
Rust
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use rustc::session::Session;
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use rustc_errors::Applicability;
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use std::str::FromStr;
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use syntax::ast;
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/// Deprecation status of attributes known by Clippy.
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#[allow(dead_code)]
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pub enum DeprecationStatus {
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/// Attribute is deprecated
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Deprecated,
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/// Attribute is deprecated and was replaced by the named attribute
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Replaced(&'static str),
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None,
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}
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pub const BUILTIN_ATTRIBUTES: &[(&str, DeprecationStatus)] = &[
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("author", DeprecationStatus::None),
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("cyclomatic_complexity", DeprecationStatus::None),
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("dump", DeprecationStatus::None),
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];
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pub struct LimitStack {
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stack: Vec<u64>,
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}
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impl Drop for LimitStack {
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fn drop(&mut self) {
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assert_eq!(self.stack.len(), 1);
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}
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}
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impl LimitStack {
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pub fn new(limit: u64) -> Self {
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Self { stack: vec![limit] }
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}
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pub fn limit(&self) -> u64 {
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*self.stack.last().expect("there should always be a value in the stack")
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}
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pub fn push_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
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let stack = &mut self.stack;
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parse_attrs(sess, attrs, name, |val| stack.push(val));
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}
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pub fn pop_attrs(&mut self, sess: &Session, attrs: &[ast::Attribute], name: &'static str) {
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let stack = &mut self.stack;
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parse_attrs(sess, attrs, name, |val| assert_eq!(stack.pop(), Some(val)));
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}
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}
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pub fn get_attr<'a>(
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sess: &'a Session,
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attrs: &'a [ast::Attribute],
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name: &'static str,
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) -> impl Iterator<Item = &'a ast::Attribute> {
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attrs.iter().filter(move |attr| {
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let attr_segments = &attr.path.segments;
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if attr_segments.len() == 2 && attr_segments[0].ident.to_string() == "clippy" {
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if let Some(deprecation_status) = BUILTIN_ATTRIBUTES
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.iter()
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.find(|(builtin_name, _)| *builtin_name == attr_segments[1].ident.to_string())
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.map(|(_, deprecation_status)| deprecation_status)
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{
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let mut db = sess.struct_span_err(attr_segments[1].ident.span, "Usage of deprecated attribute");
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match deprecation_status {
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DeprecationStatus::Deprecated => {
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db.emit();
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false
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},
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DeprecationStatus::Replaced(new_name) => {
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db.span_suggestion(
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attr_segments[1].ident.span,
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"consider using",
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new_name.to_string(),
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Applicability::MachineApplicable,
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);
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db.emit();
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false
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},
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DeprecationStatus::None => {
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db.cancel();
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attr_segments[1].ident.to_string() == name
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},
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}
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} else {
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sess.span_err(attr_segments[1].ident.span, "Usage of unknown attribute");
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false
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}
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} else {
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false
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}
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})
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}
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fn parse_attrs<F: FnMut(u64)>(sess: &Session, attrs: &[ast::Attribute], name: &'static str, mut f: F) {
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for attr in get_attr(sess, attrs, name) {
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if let Some(ref value) = attr.value_str() {
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if let Ok(value) = FromStr::from_str(&value.as_str()) {
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f(value)
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} else {
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sess.span_err(attr.span, "not a number");
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}
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} else {
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sess.span_err(attr.span, "bad clippy attribute");
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}
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}
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}
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