78 lines
2.6 KiB
Rust
78 lines
2.6 KiB
Rust
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mod completion_item;
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mod completion_context;
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mod complete_dot;
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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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use ra_db::SyntaxDatabase;
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use crate::{
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db,
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Cancelable, 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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pub use crate::completion::completion_item::{CompletionItem, InsertText, CompletionItemKind};
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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 subtelty 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(
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db: &db::RootDatabase,
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position: FilePosition,
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) -> Cancelable<Option<Completions>> {
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let original_file = db.source_file(position.file_id);
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let ctx = ctry!(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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Ok(Some(acc))
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}
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#[cfg(test)]
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fn check_completion(code: &str, expected_completions: &str, kind: CompletionKind) {
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use crate::mock_analysis::{single_file_with_position, analysis_and_position};
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let (analysis, position) = if code.contains("//-") {
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analysis_and_position(code)
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} else {
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single_file_with_position(code)
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};
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let completions = completions(&analysis.db, position).unwrap().unwrap();
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completions.assert_match(expected_completions, kind);
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}
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