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Apply couple of rule of thumbs to simplify highlighting code

Browse source 
Main one: instead of adding a parameter to function to handle special
case, make the caller handle it.

Second main one: make sure that function does a reasonable thing.
`highlight_def` picks  a color for def, *regardless* of the context
the def is use. Feeding an info from the call-site muddies the
responsibilities here.

Minor smells, flagging the function as having space for improvement in
the first place:

* many parameters, some of which are set as constants on most
call-sites (introduce severalfunction instad)
* boolean param (add two functions instead)
This commit is contained in:
Aleksey Kladov 2020-08-19 17:53:41 +02:00
parent 11a1bb1c3e
commit b56e020077
1 changed files with 16 additions and 19 deletions
Download patch file Download diff file Expand all files Collapse all files

35
crates/ide/src/syntax_highlighting.rs
View file

@ -484,9 +484,9 @@ fn highlight_element(
match name_kind {
Some(NameClass::ExternCrate(_)) => HighlightTag::Module.into(),
Some(NameClass::Definition(def)) => {
highlight_def(sema, db, def, None, false) | HighlightModifier::Definition
highlight_def(sema, db, def, None) | HighlightModifier::Definition
}
Some(NameClass::ConstReference(def)) => highlight_def(sema, db, def, None, false),
Some(NameClass::ConstReference(def)) => highlight_def(sema, db, def, None),
Some(NameClass::FieldShorthand { field, .. }) => {
let mut h = HighlightTag::Field.into();
if let Definition::Field(field) = field {
@ -519,13 +519,20 @@ fn highlight_element(
binding_hash = Some(calc_binding_hash(&name, *shadow_count))
}
};
let possibly_unsafe = match name_ref.syntax().parent() {
Some(parent) => {
matches!(parent.kind(), FIELD_EXPR | RECORD_PAT_FIELD)
let mut h = highlight_def(sema, db, def, Some(name_ref.clone()));
if let Some(parent) = name_ref.syntax().parent() {
if matches!(parent.kind(), FIELD_EXPR | RECORD_PAT_FIELD) {
if let Definition::Field(field) = def {
if let VariantDef::Union(_) = field.parent_def(db) {
h |= HighlightModifier::Unsafe;
}
}
}
None => false,
};
highlight_def(sema, db, def, Some(name_ref), possibly_unsafe)
}
h
}
NameRefClass::FieldShorthand { .. } => HighlightTag::Field.into(),
},
@ -734,20 +741,10 @@ fn highlight_def(
db: &RootDatabase,
def: Definition,
name_ref: Option<ast::NameRef>,
possibly_unsafe: bool,
) -> Highlight {
match def {
Definition::Macro(_) => HighlightTag::Macro,
Definition::Field(field) => {
let mut h = HighlightTag::Field.into();
if possibly_unsafe {
if let VariantDef::Union(_) = field.parent_def(db) {
h |= HighlightModifier::Unsafe;
}
}
return h;
}
Definition::Field(_) => HighlightTag::Field,
Definition::ModuleDef(def) => match def {
hir::ModuleDef::Module(_) => HighlightTag::Module,
hir::ModuleDef::Function(func) => {