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[ty] Implemented support for "selection range" language server feature (#19567)

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This PR adds support for the "selection range" language server feature.
This feature was recently requested by a ty user in [this feature
request](https://github.com/astral-sh/ty/issues/882).

This feature allows a client to implement "smart selection expansion"
based on the structure of the parse tree. For example, if you type
"shift-ctrl-right-arrow" in VS Code, the current selection will be
expanded to include the parent AST node. Conversely,
"shift-ctrl-left-arrow" shrinks the selection.

We will probably need to tune the granularity of selection expansion
based on user feedback. The initial implementation includes most AST
nodes, but users may find this to be too fine-grained. We have the
option of skipping some AST nodes that are not as meaningful when
editing code.

Co-authored-by: UnboundVariable <unbound@gmail.com>
This commit is contained in:
UnboundVariable 2025-07-26 09:08:36 -07:00 • committed by GitHub
parent e867830848
commit 738246627f
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8 changed files with 391 additions and 3 deletions
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8
crates/ty_server/src/server.rs
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@ -7,9 +7,10 @@ use lsp_server::Connection;
use lsp_types::{
ClientCapabilities, DeclarationCapability, DiagnosticOptions, DiagnosticServerCapabilities,
HoverProviderCapability, InitializeParams, InlayHintOptions, InlayHintServerCapabilities,
MessageType, SemanticTokensLegend, SemanticTokensOptions, SemanticTokensServerCapabilities,
ServerCapabilities, SignatureHelpOptions, TextDocumentSyncCapability, TextDocumentSyncKind,
TextDocumentSyncOptions, TypeDefinitionProviderCapability, Url, WorkDoneProgressOptions,
MessageType, SelectionRangeProviderCapability, SemanticTokensLegend, SemanticTokensOptions,
SemanticTokensServerCapabilities, ServerCapabilities, SignatureHelpOptions,
TextDocumentSyncCapability, TextDocumentSyncKind, TextDocumentSyncOptions,
TypeDefinitionProviderCapability, Url, WorkDoneProgressOptions,
};
use ruff_db::system::System;
use std::num::NonZeroUsize;
@ -241,6 +242,7 @@ impl Server {
trigger_characters: Some(vec!['.'.to_string()]),
..Default::default()
}),
selection_range_provider: Some(SelectionRangeProviderCapability::Simple(true)),
document_symbol_provider: Some(lsp_types::OneOf::Left(true)),
workspace_symbol_provider: Some(lsp_types::OneOf::Left(true)),
..Default::default()