116 lines
3.8 KiB
Rust
116 lines
3.8 KiB
Rust
mod completion_item;
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mod completion_context;
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mod presentation;
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mod complete_dot;
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mod complete_struct_literal;
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mod complete_pattern;
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mod complete_fn_param;
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mod complete_keyword;
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mod complete_snippet;
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mod complete_path;
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mod complete_scope;
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mod complete_postfix;
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use ra_db::SourceDatabase;
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use ra_syntax::ast::{self, AstNode};
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use crate::{
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db,
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FilePosition,
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completion::{
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completion_item::{Completions, CompletionKind},
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completion_context::CompletionContext,
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},
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};
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#[cfg(test)]
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use crate::completion::completion_item::{do_completion, check_completion};
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pub use crate::completion::completion_item::{CompletionItem, CompletionItemKind, InsertTextFormat};
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/// Main entry point for completion. We run completion as a two-phase process.
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///
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/// First, we look at the position and collect a so-called `CompletionContext.
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/// This is a somewhat messy process, because, during completion, syntax tree is
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/// incomplete and can look really weird.
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///
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/// Once the context is collected, we run a series of completion routines which
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/// look at the context and produce completion items. One subtlety about this
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/// phase is that completion engine should not filter by the substring which is
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/// already present, it should give all possible variants for the identifier at
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/// the caret. In other words, for
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///
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/// ```no-run
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/// fn f() {
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/// let foo = 92;
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/// let _ = bar<|>
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/// }
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/// ```
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///
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/// `foo` *should* be present among the completion variants. Filtering by
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/// identifier prefix/fuzzy match should be done higher in the stack, together
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/// with ordering of completions (currently this is done by the client).
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pub(crate) fn completions(db: &db::RootDatabase, position: FilePosition) -> Option<Completions> {
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let original_file = db.parse(position.file_id);
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let ctx = CompletionContext::new(db, &original_file, position)?;
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let mut acc = Completions::default();
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complete_fn_param::complete_fn_param(&mut acc, &ctx);
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complete_keyword::complete_expr_keyword(&mut acc, &ctx);
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complete_keyword::complete_use_tree_keyword(&mut acc, &ctx);
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complete_snippet::complete_expr_snippet(&mut acc, &ctx);
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complete_snippet::complete_item_snippet(&mut acc, &ctx);
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complete_path::complete_path(&mut acc, &ctx);
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complete_scope::complete_scope(&mut acc, &ctx);
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complete_dot::complete_dot(&mut acc, &ctx);
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complete_struct_literal::complete_struct_literal(&mut acc, &ctx);
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complete_pattern::complete_pattern(&mut acc, &ctx);
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complete_postfix::complete_postfix(&mut acc, &ctx);
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Some(acc)
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}
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pub fn function_label(node: &ast::FnDef) -> Option<String> {
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let label: String = if let Some(body) = node.body() {
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let body_range = body.syntax().range();
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let label: String = node
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.syntax()
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.children()
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.filter(|child| !child.range().is_subrange(&body_range)) // Filter out body
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.filter(|child| ast::Comment::cast(child).is_none()) // Filter out comments
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.filter(|child| ast::Attr::cast(child).is_none()) // Filter out attributes
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.map(|node| node.text().to_string())
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.collect();
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label
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} else {
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node.syntax().text().to_string()
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};
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Some(label.trim().to_owned())
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}
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pub fn const_label(node: &ast::ConstDef) -> String {
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let label: String = node
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.syntax()
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.children()
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.filter(|child| ast::Comment::cast(child).is_none())
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.filter(|child| ast::Attr::cast(child).is_none())
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.map(|node| node.text().to_string())
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.collect();
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label.trim().to_owned()
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}
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pub fn type_label(node: &ast::TypeAliasDef) -> String {
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let label: String = node
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.syntax()
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.children()
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.filter(|child| ast::Comment::cast(child).is_none())
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.filter(|child| ast::Attr::cast(child).is_none())
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.map(|node| node.text().to_string())
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.collect();
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label.trim().to_owned()
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}
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