442 lines
18 KiB
Rust
442 lines
18 KiB
Rust
pub(crate) mod tags;
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mod highlights;
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mod injector;
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mod highlight;
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mod format;
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mod macro_;
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mod inject;
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mod escape;
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mod html;
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#[cfg(test)]
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mod tests;
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use hir::{InFile, Name, Semantics};
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use ide_db::{FxHashMap, RootDatabase};
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use syntax::{
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ast, AstNode, AstToken, NodeOrToken, SyntaxKind::*, SyntaxNode, TextRange, WalkEvent, T,
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};
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use crate::{
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syntax_highlighting::{
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escape::highlight_escape_string, format::highlight_format_string, highlights::Highlights,
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macro_::MacroHighlighter, tags::Highlight,
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},
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FileId, HlMod, HlTag,
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};
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pub(crate) use html::highlight_as_html;
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#[derive(Debug, Clone, Copy)]
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pub struct HlRange {
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pub range: TextRange,
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pub highlight: Highlight,
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pub binding_hash: Option<u64>,
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}
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// Feature: Semantic Syntax Highlighting
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//
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// rust-analyzer highlights the code semantically.
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// For example, `Bar` in `foo::Bar` might be colored differently depending on whether `Bar` is an enum or a trait.
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// rust-analyzer does not specify colors directly, instead it assigns a tag (like `struct`) and a set of modifiers (like `declaration`) to each token.
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// It's up to the client to map those to specific colors.
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//
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// The general rule is that a reference to an entity gets colored the same way as the entity itself.
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// We also give special modifier for `mut` and `&mut` local variables.
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//
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//
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// .Token Tags
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//
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// Rust-analyzer currently emits the following token tags:
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//
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// - For items:
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// +
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// [horizontal]
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// attribute:: Emitted for attribute macros.
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// enum:: Emitted for enums.
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// function:: Emitted for free-standing functions.
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// derive:: Emitted for derive macros.
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// macro:: Emitted for function-like macros.
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// method:: Emitted for associated functions, also knowns as methods.
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// namespace:: Emitted for modules.
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// struct:: Emitted for structs.
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// trait:: Emitted for traits.
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// typeAlias:: Emitted for type aliases and `Self` in `impl`s.
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// union:: Emitted for unions.
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//
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// - For literals:
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// +
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// [horizontal]
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// boolean:: Emitted for the boolean literals `true` and `false`.
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// character:: Emitted for character literals.
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// number:: Emitted for numeric literals.
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// string:: Emitted for string literals.
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// escapeSequence:: Emitted for escaped sequences inside strings like `\n`.
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// formatSpecifier:: Emitted for format specifiers `{:?}` in `format!`-like macros.
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//
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// - For operators:
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// +
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// [horizontal]
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// operator:: Emitted for general operators.
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// arithmetic:: Emitted for the arithmetic operators `+`, `-`, `*`, `/`, `+=`, `-=`, `*=`, `/=`.
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// bitwise:: Emitted for the bitwise operators `|`, `&`, `!`, `^`, `|=`, `&=`, `^=`.
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// comparison:: Emitted for the comparison operators `>`, `<`, `==`, `>=`, `<=`, `!=`.
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// logical:: Emitted for the logical operators `||`, `&&`, `!`.
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//
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// - For punctuation:
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// +
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// [horizontal]
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// punctuation:: Emitted for general punctuation.
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// attributeBracket:: Emitted for attribute invocation brackets, that is the `#[` and `]` tokens.
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// angle:: Emitted for `<>` angle brackets.
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// brace:: Emitted for `{}` braces.
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// bracket:: Emitted for `[]` brackets.
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// parenthesis:: Emitted for `()` parentheses.
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// colon:: Emitted for the `:` token.
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// comma:: Emitted for the `,` token.
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// dot:: Emitted for the `.` token.
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// semi:: Emitted for the `;` token.
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// macroBang:: Emitted for the `!` token in macro calls.
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//
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// //-
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//
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// [horizontal]
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// builtinAttribute:: Emitted for names to builtin attributes in attribute path, the `repr` in `#[repr(u8)]` for example.
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// builtinType:: Emitted for builtin types like `u32`, `str` and `f32`.
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// comment:: Emitted for comments.
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// constParameter:: Emitted for const parameters.
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// enumMember:: Emitted for enum variants.
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// generic:: Emitted for generic tokens that have no mapping.
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// keyword:: Emitted for keywords.
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// label:: Emitted for labels.
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// lifetime:: Emitted for lifetimes.
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// parameter:: Emitted for non-self function parameters.
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// property:: Emitted for struct and union fields.
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// selfKeyword:: Emitted for the self function parameter and self path-specifier.
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// selfTypeKeyword:: Emitted for the Self type parameter.
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// toolModule:: Emitted for tool modules.
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// typeParameter:: Emitted for type parameters.
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// unresolvedReference:: Emitted for unresolved references, names that rust-analyzer can't find the definition of.
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// variable:: Emitted for locals, constants and statics.
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//
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//
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// .Token Modifiers
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//
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// Token modifiers allow to style some elements in the source code more precisely.
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//
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// Rust-analyzer currently emits the following token modifiers:
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//
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// [horizontal]
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// async:: Emitted for async functions and the `async` and `await` keywords.
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// attribute:: Emitted for tokens inside attributes.
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// callable:: Emitted for locals whose types implements one of the `Fn*` traits.
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// constant:: Emitted for consts.
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// consuming:: Emitted for locals that are being consumed when use in a function call.
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// controlFlow:: Emitted for control-flow related tokens, this includes the `?` operator.
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// crateRoot:: Emitted for crate names, like `serde` and `crate`.
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// declaration:: Emitted for names of definitions, like `foo` in `fn foo() {}`.
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// defaultLibrary:: Emitted for items from built-in crates (std, core, alloc, test and proc_macro).
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// documentation:: Emitted for documentation comments.
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// injected:: Emitted for doc-string injected highlighting like rust source blocks in documentation.
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// intraDocLink:: Emitted for intra doc links in doc-strings.
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// library:: Emitted for items that are defined outside of the current crate.
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// mutable:: Emitted for mutable locals and statics as well as functions taking `&mut self`.
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// public:: Emitted for items that are from the current crate and are `pub`.
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// reference:: Emitted for locals behind a reference and functions taking `self` by reference.
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// static:: Emitted for "static" functions, also known as functions that do not take a `self` param, as well as statics and consts.
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// trait:: Emitted for associated trait items.
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// unsafe:: Emitted for unsafe operations, like unsafe function calls, as well as the `unsafe` token.
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//
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//
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// image::https://user-images.githubusercontent.com/48062697/113164457-06cfb980-9239-11eb-819b-0f93e646acf8.png[]
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// image::https://user-images.githubusercontent.com/48062697/113187625-f7f50100-9250-11eb-825e-91c58f236071.png[]
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pub(crate) fn highlight(
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db: &RootDatabase,
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file_id: FileId,
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range_to_highlight: Option<TextRange>,
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syntactic_name_ref_highlighting: bool,
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) -> Vec<HlRange> {
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let _p = profile::span("highlight");
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let sema = Semantics::new(db);
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// Determine the root based on the given range.
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let (root, range_to_highlight) = {
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let source_file = sema.parse(file_id);
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let source_file = source_file.syntax();
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match range_to_highlight {
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Some(range) => {
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let node = match source_file.covering_element(range) {
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NodeOrToken::Node(it) => it,
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NodeOrToken::Token(it) => it.parent().unwrap_or_else(|| source_file.clone()),
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};
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(node, range)
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}
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None => (source_file.clone(), source_file.text_range()),
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}
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};
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let mut hl = highlights::Highlights::new(root.text_range());
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let krate = match sema.scope(&root) {
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Some(it) => it.krate(),
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None => return hl.to_vec(),
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};
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traverse(
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&mut hl,
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&sema,
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file_id,
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&root,
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krate,
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range_to_highlight,
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syntactic_name_ref_highlighting,
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);
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hl.to_vec()
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}
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fn traverse(
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hl: &mut Highlights,
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sema: &Semantics<'_, RootDatabase>,
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file_id: FileId,
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root: &SyntaxNode,
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krate: hir::Crate,
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range_to_highlight: TextRange,
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syntactic_name_ref_highlighting: bool,
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) {
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let is_unlinked = sema.to_module_def(file_id).is_none();
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let mut bindings_shadow_count: FxHashMap<Name, u32> = FxHashMap::default();
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enum AttrOrDerive {
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Attr(ast::Item),
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Derive(ast::Item),
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}
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impl AttrOrDerive {
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fn item(&self) -> &ast::Item {
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match self {
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AttrOrDerive::Attr(item) | AttrOrDerive::Derive(item) => item,
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}
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}
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}
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let mut tt_level = 0;
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let mut attr_or_derive_item = None;
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let mut current_macro: Option<ast::Macro> = None;
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let mut macro_highlighter = MacroHighlighter::default();
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let mut inside_attribute = false;
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// Walk all nodes, keeping track of whether we are inside a macro or not.
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// If in macro, expand it first and highlight the expanded code.
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for event in root.preorder_with_tokens() {
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use WalkEvent::{Enter, Leave};
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let range = match &event {
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Enter(it) | Leave(it) => it.text_range(),
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};
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// Element outside of the viewport, no need to highlight
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if range_to_highlight.intersect(range).is_none() {
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continue;
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}
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// set macro and attribute highlighting states
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match event.clone() {
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Enter(NodeOrToken::Node(node)) if ast::TokenTree::can_cast(node.kind()) => {
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tt_level += 1;
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}
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Leave(NodeOrToken::Node(node)) if ast::TokenTree::can_cast(node.kind()) => {
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tt_level -= 1;
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}
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Enter(NodeOrToken::Node(node)) if ast::Attr::can_cast(node.kind()) => {
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inside_attribute = true
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}
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Leave(NodeOrToken::Node(node)) if ast::Attr::can_cast(node.kind()) => {
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inside_attribute = false
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}
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Enter(NodeOrToken::Node(node)) if ast::Item::can_cast(node.kind()) => {
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match ast::Item::cast(node.clone()) {
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Some(ast::Item::MacroRules(mac)) => {
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macro_highlighter.init();
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current_macro = Some(mac.into());
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continue;
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}
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Some(ast::Item::MacroDef(mac)) => {
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macro_highlighter.init();
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current_macro = Some(mac.into());
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continue;
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}
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Some(item) => {
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if matches!(node.kind(), FN | CONST | STATIC) {
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bindings_shadow_count.clear();
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}
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if attr_or_derive_item.is_none() {
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if sema.is_attr_macro_call(&item) {
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attr_or_derive_item = Some(AttrOrDerive::Attr(item));
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} else {
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let adt = match item {
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ast::Item::Enum(it) => Some(ast::Adt::Enum(it)),
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ast::Item::Struct(it) => Some(ast::Adt::Struct(it)),
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ast::Item::Union(it) => Some(ast::Adt::Union(it)),
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_ => None,
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};
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match adt {
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Some(adt) if sema.is_derive_annotated(&adt) => {
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attr_or_derive_item =
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Some(AttrOrDerive::Derive(ast::Item::from(adt)));
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}
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_ => (),
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}
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}
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}
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}
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_ => (),
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}
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}
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Leave(NodeOrToken::Node(node)) if ast::Item::can_cast(node.kind()) => {
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match ast::Item::cast(node.clone()) {
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Some(ast::Item::MacroRules(mac)) => {
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assert_eq!(current_macro, Some(mac.into()));
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current_macro = None;
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macro_highlighter = MacroHighlighter::default();
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}
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Some(ast::Item::MacroDef(mac)) => {
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assert_eq!(current_macro, Some(mac.into()));
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current_macro = None;
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macro_highlighter = MacroHighlighter::default();
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}
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Some(item)
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if attr_or_derive_item.as_ref().map_or(false, |it| *it.item() == item) =>
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{
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attr_or_derive_item = None;
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}
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_ => (),
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}
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}
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_ => (),
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}
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let element = match event {
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Enter(NodeOrToken::Token(tok)) if tok.kind() == WHITESPACE => continue,
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Enter(it) => it,
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Leave(NodeOrToken::Token(_)) => continue,
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Leave(NodeOrToken::Node(node)) => {
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// Doc comment highlighting injection, we do this when leaving the node
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// so that we overwrite the highlighting of the doc comment itself.
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inject::doc_comment(hl, sema, InFile::new(file_id.into(), &node));
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continue;
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}
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};
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if current_macro.is_some() {
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if let Some(tok) = element.as_token() {
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macro_highlighter.advance(tok);
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}
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}
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let element = match element.clone() {
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NodeOrToken::Node(n) => match ast::NameLike::cast(n) {
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Some(n) => NodeOrToken::Node(n),
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None => continue,
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},
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NodeOrToken::Token(t) => NodeOrToken::Token(t),
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};
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let token = element.as_token().cloned();
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// Descending tokens into macros is expensive even if no descending occurs, so make sure
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// that we actually are in a position where descending is possible.
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let in_macro = tt_level > 0
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|| match attr_or_derive_item {
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Some(AttrOrDerive::Attr(_)) => true,
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Some(AttrOrDerive::Derive(_)) => inside_attribute,
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None => false,
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};
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let descended_element = if in_macro {
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// Attempt to descend tokens into macro-calls.
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match element {
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NodeOrToken::Token(token) if token.kind() != COMMENT => {
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let token = match attr_or_derive_item {
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Some(AttrOrDerive::Attr(_)) => {
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sema.descend_into_macros_with_kind_preference(token)
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}
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Some(AttrOrDerive::Derive(_)) | None => {
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sema.descend_into_macros_single(token)
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}
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};
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match token.parent().and_then(ast::NameLike::cast) {
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// Remap the token into the wrapping single token nodes
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Some(parent) => match (token.kind(), parent.syntax().kind()) {
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(T![self] | T![ident], NAME | NAME_REF) => NodeOrToken::Node(parent),
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(T![self] | T![super] | T![crate] | T![Self], NAME_REF) => {
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NodeOrToken::Node(parent)
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}
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(INT_NUMBER, NAME_REF) => NodeOrToken::Node(parent),
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(LIFETIME_IDENT, LIFETIME) => NodeOrToken::Node(parent),
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_ => NodeOrToken::Token(token),
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},
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None => NodeOrToken::Token(token),
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}
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}
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e => e,
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}
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} else {
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element
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};
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// FIXME: do proper macro def highlighting https://github.com/rust-lang/rust-analyzer/issues/6232
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// Skip metavariables from being highlighted to prevent keyword highlighting in them
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if descended_element.as_token().and_then(|t| macro_highlighter.highlight(t)).is_some() {
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continue;
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}
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// string highlight injections, note this does not use the descended element as proc-macros
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// can rewrite string literals which invalidates our indices
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if let (Some(token), Some(descended_token)) = (token, descended_element.as_token()) {
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if ast::String::can_cast(token.kind()) && ast::String::can_cast(descended_token.kind())
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{
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let string = ast::String::cast(token);
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let string_to_highlight = ast::String::cast(descended_token.clone());
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if let Some((string, expanded_string)) = string.zip(string_to_highlight) {
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if string.is_raw() {
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if inject::ra_fixture(hl, sema, &string, &expanded_string).is_some() {
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continue;
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}
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}
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highlight_format_string(hl, &string, &expanded_string, range);
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highlight_escape_string(hl, &string, range.start());
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}
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} else if ast::ByteString::can_cast(token.kind())
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&& ast::ByteString::can_cast(descended_token.kind())
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{
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if let Some(byte_string) = ast::ByteString::cast(token) {
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highlight_escape_string(hl, &byte_string, range.start());
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}
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}
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}
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let element = match descended_element {
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NodeOrToken::Node(name_like) => highlight::name_like(
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sema,
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krate,
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&mut bindings_shadow_count,
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syntactic_name_ref_highlighting,
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name_like,
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),
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NodeOrToken::Token(token) => highlight::token(sema, token).zip(Some(None)),
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};
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if let Some((mut highlight, binding_hash)) = element {
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if is_unlinked && highlight.tag == HlTag::UnresolvedReference {
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// do not emit unresolved references if the file is unlinked
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// let the editor do its highlighting for these tokens instead
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continue;
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}
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if inside_attribute {
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highlight |= HlMod::Attribute
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}
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hl.add(HlRange { range, highlight, binding_hash });
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}
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}
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}
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