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add logic to highlight continue and break keywords according to expectations

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This commit is contained in:
Moritz Vetter 2022-02-13 12:48:04 +01:00
parent cad0cf6950
commit 3da08071ce
2 changed files with 60 additions and 32 deletions
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63
crates/ide/src/highlight_related.rs
View File

@ -2,7 +2,9 @@ use hir::Semantics;
use ide_db::{
base_db::{FileId, FilePosition},
defs::{Definition, IdentClass},
helpers::{for_each_break_expr, for_each_tail_expr, node_ext::walk_expr, pick_best_token},
helpers::{
for_each_break_and_continue_expr, for_each_tail_expr, node_ext::walk_expr, pick_best_token,
},
search::{FileReference, ReferenceCategory, SearchScope},
RootDatabase,
};
@ -10,7 +12,7 @@ use rustc_hash::FxHashSet;
use syntax::{
ast::{self, HasLoopBody},
match_ast, AstNode,
SyntaxKind::{IDENT, INT_NUMBER},
SyntaxKind::{self, IDENT, INT_NUMBER},
SyntaxNode, SyntaxToken, TextRange, T,
};
@ -66,7 +68,9 @@ pub(crate) fn highlight_related(
T![for] if config.break_points && token.parent().and_then(ast::ForExpr::cast).is_some() => {
highlight_break_points(token)
}
T![break] | T![loop] | T![while] if config.break_points => highlight_break_points(token),
T![break] | T![loop] | T![while] | T![continue] if config.break_points => {
highlight_break_points(token)
}
_ if config.references => highlight_references(sema, &syntax, token, file_id),
_ => None,
}
@ -187,6 +191,7 @@ fn highlight_exit_points(
fn highlight_break_points(token: SyntaxToken) -> Option<Vec<HighlightedRange>> {
fn hl(
cursor_token_kind: SyntaxKind,
token: Option<SyntaxToken>,
label: Option<ast::Label>,
body: Option<ast::StmtList>,
@ -197,11 +202,20 @@ fn highlight_break_points(token: SyntaxToken) -> Option<Vec<HighlightedRange>> {
label.as_ref().map(|it| it.syntax().text_range()),
);
highlights.extend(range.map(|range| HighlightedRange { category: None, range }));
for_each_break_expr(label, body, &mut |expr| {
let range: Option<TextRange> = match expr {
ast::Expr::BreakExpr(break_) => cover_range(
break_.break_token().map(|it| it.text_range()),
break_.lifetime().map(|it| it.syntax().text_range()),
for_each_break_and_continue_expr(label, body, &mut |expr| {
let range: Option<TextRange> = match (cursor_token_kind, expr) {
(T![for] | T![while] | T![loop] | T![break], ast::Expr::BreakExpr(break_)) => {
cover_range(
break_.break_token().map(|it| it.text_range()),
break_.lifetime().map(|it| it.syntax().text_range()),
)
}
(
T![for] | T![while] | T![loop] | T![continue],
ast::Expr::ContinueExpr(continue_),
) => cover_range(
continue_.continue_token().map(|it| it.text_range()),
continue_.lifetime().map(|it| it.syntax().text_range()),
),
_ => None,
};
@ -213,6 +227,7 @@ fn highlight_break_points(token: SyntaxToken) -> Option<Vec<HighlightedRange>> {
let lbl = match_ast! {
match parent {
ast::BreakExpr(b) => b.lifetime(),
ast::ContinueExpr(c) => c.lifetime(),
ast::LoopExpr(l) => l.label().and_then(|it| it.lifetime()),
ast::ForExpr(f) => f.label().and_then(|it| it.lifetime()),
ast::WhileExpr(w) => w.label().and_then(|it| it.lifetime()),
@ -227,19 +242,29 @@ fn highlight_break_points(token: SyntaxToken) -> Option<Vec<HighlightedRange>> {
}
None => true,
};
let token_kind = token.kind();
for anc in token.ancestors().flat_map(ast::Expr::cast) {
return match anc {
ast::Expr::LoopExpr(l) if label_matches(l.label()) => {
hl(l.loop_token(), l.label(), l.loop_body().and_then(|it| it.stmt_list()))
}
ast::Expr::ForExpr(f) if label_matches(f.label()) => {
hl(f.for_token(), f.label(), f.loop_body().and_then(|it| it.stmt_list()))
}
ast::Expr::WhileExpr(w) if label_matches(w.label()) => {
hl(w.while_token(), w.label(), w.loop_body().and_then(|it| it.stmt_list()))
}
ast::Expr::LoopExpr(l) if label_matches(l.label()) => hl(
token_kind,
l.loop_token(),
l.label(),
l.loop_body().and_then(|it| it.stmt_list()),
),
ast::Expr::ForExpr(f) if label_matches(f.label()) => hl(
token_kind,
f.for_token(),
f.label(),
f.loop_body().and_then(|it| it.stmt_list()),
),
ast::Expr::WhileExpr(w) if label_matches(w.label()) => hl(
token_kind,
w.while_token(),
w.label(),
w.loop_body().and_then(|it| it.stmt_list()),
),
ast::Expr::BlockExpr(e) if e.label().is_some() && label_matches(e.label()) => {
hl(None, e.label(), e.stmt_list())
hl(token_kind, None, e.label(), e.stmt_list())
}
_ => continue,
};
@ -882,7 +907,7 @@ fn foo() {
check(
r#"
fn foo() {
'outer$0: for _ in () {
'outer: fo$0r _ in () {
// ^^^^^^^^^^^
break;
// ^^^^^

29
crates/ide_db/src/helpers.rs
View File

@ -120,9 +120,7 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
) => return cb(expr),
Some(ast::BlockModifier::Label(label)) => {
for_each_break_expr(Some(label), b.stmt_list(), &mut |b| {
cb(&b)
});
for_each_break_and_continue_expr(Some(label), b.stmt_list(), &mut |b| cb(&b));
}
Some(ast::BlockModifier::Unsafe(_)) => (),
None => (),
@ -149,16 +147,16 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
}
}
}
ast::Expr::LoopExpr(l) => {
for_each_break_expr(l.label(), l.loop_body().and_then(|it| it.stmt_list()), &mut |b| {
cb(&b)
})
}
ast::Expr::LoopExpr(l) => for_each_break_and_continue_expr(
l.label(),
l.loop_body().and_then(|it| it.stmt_list()),
&mut |b| cb(&b),
),
ast::Expr::MatchExpr(m) => {
if let Some(arms) = m.match_arm_list() {
arms.arms().filter_map(|arm| arm.expr()).for_each(|e| for_each_tail_expr(&e, &mut |b| {
cb(&b)
}));
arms.arms()
.filter_map(|arm| arm.expr())
.for_each(|e| for_each_tail_expr(&e, &mut |b| cb(&b)));
}
}
ast::Expr::ArrayExpr(_)
@ -192,8 +190,8 @@ pub fn for_each_tail_expr(expr: &ast::Expr, cb: &mut dyn FnMut(&ast::Expr)) {
}
}
/// Calls `cb` on each break expr inside of `body` that is applicable for the given label.
pub fn for_each_break_expr(
/// Calls `cb` on each break expr and continue expr inside of `body` that is applicable for the given label.
pub fn for_each_break_and_continue_expr(
label: Option<ast::Label>,
body: Option<ast::StmtList>,
cb: &mut dyn FnMut(ast::Expr),
@ -221,6 +219,11 @@ pub fn for_each_break_expr(
{
cb(ast::Expr::BreakExpr(b));
}
ast::Expr::ContinueExpr(c)
if (depth == 0 && c.lifetime().is_none()) || eq_label(c.lifetime()) =>
{
cb(ast::Expr::ContinueExpr(c))
}
_ => (),
},
WalkEvent::Leave(expr) => match expr {