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|
//! Looks for items missing (or incorrectly having) doctests.
//!
//! This pass is overloaded and runs two different lints.
//!
//! - MISSING_DOC_CODE_EXAMPLES: this lint is **UNSTABLE** and looks for public items missing doctests.
//! - PRIVATE_DOC_TESTS: this lint is **STABLE** and looks for private items with doctests.
use super::Pass;
use crate::clean;
use crate::clean::*;
use crate::core::DocContext;
use crate::html::markdown::{find_testable_code, ErrorCodes, Ignore, LangString};
use crate::visit::DocVisitor;
use crate::visit_ast::inherits_doc_hidden;
use rustc_hir as hir;
use rustc_middle::lint::LintLevelSource;
use rustc_session::lint;
use rustc_span::symbol::sym;
pub(crate) const CHECK_DOC_TEST_VISIBILITY: Pass = Pass {
name: "check_doc_test_visibility",
run: check_doc_test_visibility,
description: "run various visibility-related lints on doctests",
};
struct DocTestVisibilityLinter<'a, 'tcx> {
cx: &'a mut DocContext<'tcx>,
}
pub(crate) fn check_doc_test_visibility(krate: Crate, cx: &mut DocContext<'_>) -> Crate {
let mut coll = DocTestVisibilityLinter { cx };
coll.visit_crate(&krate);
krate
}
impl<'a, 'tcx> DocVisitor for DocTestVisibilityLinter<'a, 'tcx> {
fn visit_item(&mut self, item: &Item) {
let dox = item.attrs.collapsed_doc_value().unwrap_or_default();
look_for_tests(self.cx, &dox, item);
self.visit_item_recur(item)
}
}
pub(crate) struct Tests {
pub(crate) found_tests: usize,
}
impl crate::doctest::Tester for Tests {
fn add_test(&mut self, _: String, config: LangString, _: usize) {
if config.rust && config.ignore == Ignore::None {
self.found_tests += 1;
}
}
}
pub(crate) fn should_have_doc_example(cx: &DocContext<'_>, item: &clean::Item) -> bool {
if !cx.cache.effective_visibilities.is_directly_public(item.item_id.expect_def_id())
|| matches!(
*item.kind,
clean::StructFieldItem(_)
| clean::VariantItem(_)
| clean::AssocConstItem(..)
| clean::AssocTypeItem(..)
| clean::TypedefItem(_)
| clean::StaticItem(_)
| clean::ConstantItem(_)
| clean::ExternCrateItem { .. }
| clean::ImportItem(_)
| clean::PrimitiveItem(_)
| clean::KeywordItem
// check for trait impl
| clean::ImplItem(box clean::Impl { trait_: Some(_), .. })
)
{
return false;
}
// The `expect_def_id()` should be okay because `local_def_id_to_hir_id`
// would presumably panic if a fake `DefIndex` were passed.
let hir_id = cx.tcx.hir().local_def_id_to_hir_id(item.item_id.expect_def_id().expect_local());
// check if parent is trait impl
if let Some(parent_hir_id) = cx.tcx.hir().find_parent_node(hir_id) {
if let Some(parent_node) = cx.tcx.hir().find(parent_hir_id) {
if matches!(
parent_node,
hir::Node::Item(hir::Item {
kind: hir::ItemKind::Impl(hir::Impl { of_trait: Some(_), .. }),
..
})
) {
return false;
}
}
}
if cx.tcx.hir().attrs(hir_id).lists(sym::doc).has_word(sym::hidden)
|| inherits_doc_hidden(cx.tcx, hir_id)
|| cx.tcx.hir().span(hir_id).in_derive_expansion()
{
return false;
}
let (level, source) = cx.tcx.lint_level_at_node(crate::lint::MISSING_DOC_CODE_EXAMPLES, hir_id);
level != lint::Level::Allow || matches!(source, LintLevelSource::Default)
}
pub(crate) fn look_for_tests<'tcx>(cx: &DocContext<'tcx>, dox: &str, item: &Item) {
let Some(hir_id) = DocContext::as_local_hir_id(cx.tcx, item.item_id)
else {
// If non-local, no need to check anything.
return;
};
let mut tests = Tests { found_tests: 0 };
find_testable_code(dox, &mut tests, ErrorCodes::No, false, None);
if tests.found_tests == 0 && cx.tcx.features().rustdoc_missing_doc_code_examples {
if should_have_doc_example(cx, item) {
debug!("reporting error for {:?} (hir_id={:?})", item, hir_id);
let sp = item.attr_span(cx.tcx);
cx.tcx.struct_span_lint_hir(
crate::lint::MISSING_DOC_CODE_EXAMPLES,
hir_id,
sp,
"missing code example in this documentation",
|lint| lint,
);
}
} else if tests.found_tests > 0
&& !cx.cache.effective_visibilities.is_exported(item.item_id.expect_def_id())
{
cx.tcx.struct_span_lint_hir(
crate::lint::PRIVATE_DOC_TESTS,
hir_id,
item.attr_span(cx.tcx),
"documentation test in private item",
|lint| lint,
);
}
}
|
