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use crate::{
LanguageService,
binder::{Symbol, SymbolKey, SymbolKind, SymbolTable},
helpers,
};
use line_index::LineIndex;
use lspt::{DocumentHighlight, DocumentHighlightKind, DocumentHighlightParams};
use rowan::{Direction, ast::AstNode};
use wat_syntax::{SyntaxElement, SyntaxKind, SyntaxNode, ast::PlainInstr};
impl LanguageService {
/// Handler for `textDocument/documentHighlight` request.
pub fn document_highlight(
&self,
params: DocumentHighlightParams,
) -> Option<Vec<DocumentHighlight>> {
let document = self.get_document(params.text_document.uri)?;
let line_index = document.line_index(self);
let root = document.root_tree(self);
let token = super::find_meaningful_token(self, document, &root, params.position)?;
let kind = token.kind();
match kind {
SyntaxKind::KEYWORD
| SyntaxKind::INSTR_NAME
| SyntaxKind::TYPE_KEYWORD
| SyntaxKind::MEM_ARG_KEYWORD
| SyntaxKind::FLOAT
| SyntaxKind::SHAPE_DESCRIPTOR => {
let text = token.text();
Some(
root.descendants_with_tokens()
.filter_map(|element| match element {
SyntaxElement::Token(other)
if other.kind() == kind && other.text() == text =>
{
Some(DocumentHighlight {
range: helpers::rowan_range_to_lsp_range(
line_index,
other.text_range(),
),
kind: Some(DocumentHighlightKind::Text),
})
}
_ => None,
})
.collect(),
)
}
SyntaxKind::IDENT | SyntaxKind::INT | SyntaxKind::UNSIGNED_INT => {
let symbol_table = SymbolTable::of(self, document);
let key = SymbolKey::new(&token.parent()?);
if let Some(symbol) = symbol_table.symbols.get(&key) {
match symbol.kind {
SymbolKind::Module => None,
SymbolKind::Func
| SymbolKind::Param
| SymbolKind::Local
| SymbolKind::Type
| SymbolKind::GlobalDef
| SymbolKind::MemoryDef
| SymbolKind::TableDef
| SymbolKind::FieldDef
| SymbolKind::TagDef => Some(
symbol_table
.find_references_on_def(symbol, true)
.filter_map(|symbol| {
create_symbol_highlight(symbol, &root, line_index)
})
.collect(),
),
SymbolKind::Call
| SymbolKind::LocalRef
| SymbolKind::TypeUse
| SymbolKind::GlobalRef
| SymbolKind::MemoryRef
| SymbolKind::TableRef
| SymbolKind::FieldRef
| SymbolKind::TagRef => Some(
symbol_table
.find_references_on_ref(symbol, true)
.filter_map(|symbol| {
create_symbol_highlight(symbol, &root, line_index)
})
.collect(),
),
SymbolKind::BlockDef => Some(
symbol_table
.find_block_references(key, true)
.filter_map(|symbol| {
create_symbol_highlight(symbol, &root, line_index)
})
.collect(),
),
SymbolKind::BlockRef => symbol_table.resolved.get(&key).map(|def_key| {
symbol_table
.find_block_references(*def_key, true)
.filter_map(|symbol| {
create_symbol_highlight(symbol, &root, line_index)
})
.collect()
}),
}
} else {
let text = token.text();
Some(
root.descendants_with_tokens()
.filter_map(|element| match element {
SyntaxElement::Token(other)
if other.kind() == kind
&& other.text() == text
&& other
.parent()
.and_then(|parent| parent.parent())
.and_then(PlainInstr::cast)
.and_then(|instr| instr.instr_name())
.is_some_and(|name| {
name.text().ends_with(".const")
}) =>
{
Some(DocumentHighlight {
range: helpers::rowan_range_to_lsp_range(
line_index,
other.text_range(),
),
kind: Some(DocumentHighlightKind::Text),
})
}
_ => None,
})
.collect(),
)
}
}
_ => None,
}
}
}
fn create_symbol_highlight(
symbol: &Symbol,
root: &SyntaxNode,
line_index: &LineIndex,
) -> Option<DocumentHighlight> {
let node = symbol.key.to_node(root);
node.children_with_tokens()
.find_map(|element| match element {
SyntaxElement::Token(token)
if matches!(
token.kind(),
SyntaxKind::IDENT
| SyntaxKind::INT
| SyntaxKind::UNSIGNED_INT
| SyntaxKind::TYPE_KEYWORD
) =>
{
Some(DocumentHighlight {
range: helpers::rowan_range_to_lsp_range(line_index, token.text_range()),
kind: get_highlight_kind_of_symbol(symbol, root),
})
}
_ => None,
})
}
fn get_highlight_kind_of_symbol(
symbol: &Symbol,
root: &SyntaxNode,
) -> Option<DocumentHighlightKind> {
match symbol.kind {
SymbolKind::Func
| SymbolKind::Param
| SymbolKind::Local
| SymbolKind::Type
| SymbolKind::GlobalDef
| SymbolKind::MemoryDef
| SymbolKind::TableDef
| SymbolKind::BlockDef
| SymbolKind::FieldDef
| SymbolKind::TagDef => Some(DocumentHighlightKind::Write),
SymbolKind::Call | SymbolKind::TypeUse | SymbolKind::MemoryRef | SymbolKind::BlockRef => {
Some(DocumentHighlightKind::Read)
}
SymbolKind::LocalRef
| SymbolKind::GlobalRef
| SymbolKind::TableRef
| SymbolKind::FieldRef
| SymbolKind::TagRef => {
let node = symbol.key.to_node(root);
if node
.siblings_with_tokens(Direction::Prev)
.any(|element| is_write_access_instr(element, &node))
{
Some(DocumentHighlightKind::Write)
} else {
Some(DocumentHighlightKind::Read)
}
}
SymbolKind::Module => None,
}
}
fn is_write_access_instr(element: SyntaxElement, node: &SyntaxNode) -> bool {
if let SyntaxElement::Token(token) = element {
if token.kind() != SyntaxKind::INSTR_NAME {
return false;
}
let text = token.text();
if text == "table.copy" {
// The first immediate in `table.copy` is the destination table.
node.siblings_with_tokens(Direction::Prev)
.skip(1)
.all(|element| element.kind() != SyntaxKind::IMMEDIATE)
} else {
matches!(
text,
"local.set"
| "local.tee"
| "global.set"
| "table.init"
| "table.set"
| "table.grow"
| "table.fill"
| "struct.set"
)
}
} else {
false
}
}