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Split loop into orthogonal phases

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This commit is contained in:
Aleksey Kladov 2020-02-27 11:56:42 +01:00
parent 9bb1718639
commit a2dbdbba00
1 changed files with 43 additions and 44 deletions
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87
crates/ra_ide/src/syntax_highlighting.rs
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@ -69,7 +69,7 @@ pub(crate) fn highlight(
let mut bindings_shadow_count: FxHashMap<Name, u32> = FxHashMap::default();
let mut res = Vec::new();
let mut in_macro_call = None;
let mut current_macro_call: Option<ast::MacroCall> = None;
for event in root.preorder_with_tokens() {
let event_range = match &event {
@ -81,58 +81,57 @@ pub(crate) fn highlight(
continue;
}
match event {
WalkEvent::Enter(node) => match node.kind() {
MACRO_CALL => {
in_macro_call = Some(node.clone());
if let Some(range) = highlight_macro(node) {
res.push(HighlightedRange {
range,
highlight: HighlightTag::Macro.into(),
binding_hash: None,
});
}
match event.clone().map(|it| it.into_node().and_then(ast::MacroCall::cast)) {
WalkEvent::Enter(Some(mc)) => {
current_macro_call = Some(mc.clone());
if let Some(range) = highlight_macro(&mc) {
res.push(HighlightedRange {
range,
highlight: HighlightTag::Macro.into(),
binding_hash: None,
});
}
_ if in_macro_call.is_some() => {
if let Some(token) = node.as_token() {
if let Some((highlight, binding_hash)) =
highlight_token_tree(&sema, &mut bindings_shadow_count, token.clone())
{
res.push(HighlightedRange {
range: node.text_range(),
highlight,
binding_hash,
});
}
}
}
_ => {
if let Some((highlight, binding_hash)) =
highlight_node(&sema, &mut bindings_shadow_count, node.clone())
{
res.push(HighlightedRange {
range: node.text_range(),
highlight,
binding_hash,
});
}
}
},
WalkEvent::Leave(node) => {
if let Some(m) = in_macro_call.as_ref() {
if *m == node {
in_macro_call = None;
}
continue;
}
WalkEvent::Leave(Some(mc)) => {
assert!(current_macro_call == Some(mc));
current_macro_call = None;
continue;
}
_ => (),
}
let node = match event {
WalkEvent::Enter(it) => it,
WalkEvent::Leave(_) => continue,
};
if current_macro_call.is_some() {
if let Some(token) = node.into_token() {
if let Some((highlight, binding_hash)) =
highlight_token_tree(&sema, &mut bindings_shadow_count, token.clone())
{
res.push(HighlightedRange {
range: token.text_range(),
highlight,
binding_hash,
});
}
}
continue;
}
if let Some((highlight, binding_hash)) =
highlight_node(&sema, &mut bindings_shadow_count, node.clone())
{
res.push(HighlightedRange { range: node.text_range(), highlight, binding_hash });
}
}
res
}
fn highlight_macro(node: SyntaxElement) -> Option<TextRange> {
let macro_call = ast::MacroCall::cast(node.as_node()?.clone())?;
fn highlight_macro(macro_call: &ast::MacroCall) -> Option<TextRange> {
let path = macro_call.path()?;
let name_ref = path.segment()?.name_ref()?;