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server.py
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"""Jedi Language Server.
Creates the language server constant and wraps "features" with it.
Official language server spec:
https://microsoft.github.io/language-server-protocol/specification
"""
import itertools
from typing import Any, List, Optional, Union
import cattrs
from jedi import Project, __version__
from jedi.api.refactoring import RefactoringError
from lsprotocol.types import (
COMPLETION_ITEM_RESOLVE,
INITIALIZE,
TEXT_DOCUMENT_CODE_ACTION,
TEXT_DOCUMENT_COMPLETION,
TEXT_DOCUMENT_DEFINITION,
TEXT_DOCUMENT_DID_CHANGE,
TEXT_DOCUMENT_DID_CLOSE,
TEXT_DOCUMENT_DID_OPEN,
TEXT_DOCUMENT_DID_SAVE,
TEXT_DOCUMENT_DOCUMENT_HIGHLIGHT,
TEXT_DOCUMENT_DOCUMENT_SYMBOL,
TEXT_DOCUMENT_HOVER,
TEXT_DOCUMENT_REFERENCES,
TEXT_DOCUMENT_RENAME,
TEXT_DOCUMENT_SIGNATURE_HELP,
TEXT_DOCUMENT_TYPE_DEFINITION,
WORKSPACE_DID_CHANGE_CONFIGURATION,
WORKSPACE_SYMBOL,
CodeAction,
CodeActionKind,
CodeActionOptions,
CodeActionParams,
CompletionItem,
CompletionList,
CompletionOptions,
CompletionParams,
DidChangeConfigurationParams,
DidChangeTextDocumentParams,
DidCloseTextDocumentParams,
DidOpenTextDocumentParams,
DidSaveTextDocumentParams,
DocumentHighlight,
DocumentSymbol,
DocumentSymbolParams,
Hover,
InitializeParams,
InitializeResult,
Location,
MarkupContent,
MarkupKind,
MessageType,
ParameterInformation,
RenameParams,
SignatureHelp,
SignatureHelpOptions,
SignatureInformation,
SymbolInformation,
TextDocumentPositionParams,
WorkspaceEdit,
WorkspaceSymbolParams,
)
from pygls.capabilities import get_capability
from pygls.protocol import LanguageServerProtocol, lsp_method
from pygls.server import LanguageServer
from . import jedi_utils, pygls_utils, text_edit_utils
from .initialization_options import (
InitializationOptions,
initialization_options_converter,
)
class JediLanguageServerProtocol(LanguageServerProtocol):
"""Override some built-in functions."""
@lsp_method(INITIALIZE)
def lsp_initialize(self, params: InitializeParams) -> InitializeResult:
"""Override built-in initialization.
Here, we can conditionally register functions to features based
on client capabilities and initializationOptions.
"""
server: "JediLanguageServer" = self._server
try:
server.initialization_options = (
initialization_options_converter.structure(
{}
if params.initialization_options is None
else params.initialization_options,
InitializationOptions,
)
)
except cattrs.BaseValidationError as error:
msg = (
"Invalid InitializationOptions, using defaults:"
f" {cattrs.transform_error(error)}"
)
server.show_message(msg, msg_type=MessageType.Error)
server.show_message_log(msg, msg_type=MessageType.Error)
server.initialization_options = InitializationOptions()
initialization_options = server.initialization_options
jedi_utils.set_jedi_settings(initialization_options)
# Configure didOpen, didChange, and didSave
# currently need to be configured manually
diagnostics = initialization_options.diagnostics
did_open = (
did_open_diagnostics
if diagnostics.enable and diagnostics.did_open
else did_open_default
)
did_change = (
did_change_diagnostics
if diagnostics.enable and diagnostics.did_change
else did_change_default
)
did_save = (
did_save_diagnostics
if diagnostics.enable and diagnostics.did_save
else did_save_default
)
did_close = (
did_close_diagnostics if diagnostics.enable else did_close_default
)
server.feature(TEXT_DOCUMENT_DID_OPEN)(did_open)
server.feature(TEXT_DOCUMENT_DID_CHANGE)(did_change)
server.feature(TEXT_DOCUMENT_DID_SAVE)(did_save)
server.feature(TEXT_DOCUMENT_DID_CLOSE)(did_close)
if server.initialization_options.hover.enable:
server.feature(TEXT_DOCUMENT_HOVER)(hover)
initialize_result: InitializeResult = super().lsp_initialize(params)
workspace_options = initialization_options.workspace
server.project = (
Project(
path=server.workspace.root_path,
environment_path=workspace_options.environment_path,
added_sys_path=workspace_options.extra_paths,
smart_sys_path=True,
load_unsafe_extensions=False,
)
if server.workspace.root_path
else None
)
return initialize_result
class JediLanguageServer(LanguageServer):
"""Jedi language server.
:attr initialization_options: initialized in lsp_initialize from the
protocol_cls.
:attr project: a Jedi project. This value is created in
`JediLanguageServerProtocol.lsp_initialize`.
"""
initialization_options: InitializationOptions
project: Optional[Project]
def __init__(self, *args: Any, **kwargs: Any) -> None:
super().__init__(*args, **kwargs)
SERVER = JediLanguageServer(
name="jedi-language-server",
version=__version__,
protocol_cls=JediLanguageServerProtocol,
)
# Server capabilities
@SERVER.feature(COMPLETION_ITEM_RESOLVE)
def completion_item_resolve(
server: JediLanguageServer, params: CompletionItem
) -> CompletionItem:
"""Resolves documentation and detail of given completion item."""
markup_kind = _choose_markup(server)
return jedi_utils.lsp_completion_item_resolve(
params, markup_kind=markup_kind
)
@SERVER.feature(
TEXT_DOCUMENT_COMPLETION,
CompletionOptions(
trigger_characters=[".", "'", '"'], resolve_provider=True
),
)
def completion(
server: JediLanguageServer, params: CompletionParams
) -> Optional[CompletionList]:
"""Returns completion items."""
# pylint: disable=too-many-locals
snippet_disable = server.initialization_options.completion.disable_snippets
resolve_eagerly = server.initialization_options.completion.resolve_eagerly
ignore_patterns = server.initialization_options.completion.ignore_patterns
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
completions_jedi_raw = jedi_script.complete(*jedi_lines)
if not ignore_patterns:
# A performance optimization. ignore_patterns should usually be empty;
# this special case avoid repeated filter checks for the usual case.
completions_jedi = (comp for comp in completions_jedi_raw)
else:
completions_jedi = (
comp
for comp in completions_jedi_raw
if not any(i.match(comp.name) for i in ignore_patterns)
)
snippet_support = get_capability(
server.client_capabilities,
"text_document.completion.completion_item.snippet_support",
False,
)
markup_kind = _choose_markup(server)
is_import_context = jedi_utils.is_import(
script_=jedi_script,
line=jedi_lines[0],
column=jedi_lines[1],
)
enable_snippets = (
snippet_support and not snippet_disable and not is_import_context
)
char_before_cursor = pygls_utils.char_before_cursor(
document=server.workspace.get_document(params.text_document.uri),
position=params.position,
)
jedi_utils.clear_completions_cache()
# number of characters in the string representation of the total number of
# completions returned by jedi.
total_completion_chars = len(str(len(completions_jedi_raw)))
completion_items = [
jedi_utils.lsp_completion_item(
completion=completion,
char_before_cursor=char_before_cursor,
enable_snippets=enable_snippets,
resolve_eagerly=resolve_eagerly,
markup_kind=markup_kind,
sort_append_text=str(count).zfill(total_completion_chars),
)
for count, completion in enumerate(completions_jedi)
]
return (
CompletionList(is_incomplete=False, items=completion_items)
if completion_items
else None
)
@SERVER.feature(
TEXT_DOCUMENT_SIGNATURE_HELP,
SignatureHelpOptions(trigger_characters=["(", ","]),
)
def signature_help(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[SignatureHelp]:
"""Returns signature help.
Note: for docstring, we currently choose plaintext because coc doesn't
handle markdown well in the signature. Will update if this changes in the
future.
"""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
signatures_jedi = jedi_script.get_signatures(*jedi_lines)
markup_kind = _choose_markup(server)
signatures = [
SignatureInformation(
label=jedi_utils.signature_string(signature),
documentation=MarkupContent(
kind=markup_kind,
value=jedi_utils.convert_docstring(
signature.docstring(raw=True),
markup_kind,
),
),
parameters=[
ParameterInformation(label=info.to_string())
for info in signature.params
],
)
for signature in signatures_jedi
]
return (
SignatureHelp(
signatures=signatures,
active_signature=0,
active_parameter=(
signatures_jedi[0].index if signatures_jedi else 0
),
)
if signatures
else None
)
@SERVER.feature(TEXT_DOCUMENT_DEFINITION)
def definition(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[List[Location]]:
"""Support Goto Definition."""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
names = jedi_script.goto(
*jedi_lines,
follow_imports=True,
follow_builtin_imports=True,
)
definitions = [
definition
for definition in (jedi_utils.lsp_location(name) for name in names)
if definition is not None
]
return definitions if definitions else None
@SERVER.feature(TEXT_DOCUMENT_TYPE_DEFINITION)
def type_definition(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[List[Location]]:
"""Support Goto Type Definition."""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
names = jedi_script.infer(*jedi_lines)
definitions = [
definition
for definition in (jedi_utils.lsp_location(name) for name in names)
if definition is not None
]
return definitions if definitions else None
@SERVER.feature(TEXT_DOCUMENT_DOCUMENT_HIGHLIGHT)
def highlight(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[List[DocumentHighlight]]:
"""Support document highlight request.
This function is called frequently, so we minimize the number of expensive
calls. These calls are:
1. Getting assignment of current symbol (script.goto)
2. Getting all names in the current script (script.get_names)
Finally, we only return names if there are more than 1. Otherwise, we don't
want to highlight anything.
"""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
names = jedi_script.get_references(*jedi_lines, scope="file")
lsp_ranges = [jedi_utils.lsp_range(name) for name in names]
highlight_names = [
DocumentHighlight(range=lsp_range)
for lsp_range in lsp_ranges
if lsp_range
]
return highlight_names if highlight_names else None
# Registered with HOVER dynamically
def hover(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[Hover]:
"""Support Hover."""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
markup_kind = _choose_markup(server)
hover_text = jedi_utils.hover_text(
jedi_script.help(*jedi_lines),
markup_kind,
server.initialization_options,
)
if not hover_text:
return None
contents = MarkupContent(kind=markup_kind, value=hover_text)
_range = pygls_utils.current_word_range(document, params.position)
return Hover(contents=contents, range=_range)
@SERVER.feature(TEXT_DOCUMENT_REFERENCES)
def references(
server: JediLanguageServer, params: TextDocumentPositionParams
) -> Optional[List[Location]]:
"""Obtain all references to text."""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
names = jedi_script.get_references(*jedi_lines)
locations = [
location
for location in (jedi_utils.lsp_location(name) for name in names)
if location is not None
]
return locations if locations else None
@SERVER.feature(TEXT_DOCUMENT_DOCUMENT_SYMBOL)
def document_symbol(
server: JediLanguageServer, params: DocumentSymbolParams
) -> Optional[Union[List[DocumentSymbol], List[SymbolInformation]]]:
"""Document Python document symbols, hierarchically if possible.
In Jedi, valid values for `name.type` are:
- `module`
- `class`
- `instance`
- `function`
- `param`
- `path`
- `keyword`
- `statement`
We do some cleaning here. For hierarchical symbols, names from scopes that
aren't directly accessible with dot notation are removed from display. For
non-hierarchical symbols, we simply remove `param` symbols. Others are
included for completeness.
"""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
names = jedi_script.get_names(all_scopes=True, definitions=True)
if get_capability(
server.client_capabilities,
"text_document.document_symbol.hierarchical_document_symbol_support",
False,
):
document_symbols = jedi_utils.lsp_document_symbols(names)
return document_symbols if document_symbols else None
symbol_information = [
symbol_info
for symbol_info in (
jedi_utils.lsp_symbol_information(name)
for name in names
if name.type != "param"
)
if symbol_info is not None
]
return symbol_information if symbol_information else None
def _ignore_folder(path_check: str, jedi_ignore_folders: List[str]) -> bool:
"""Determines whether there's an ignore folder in the path.
Intended to be used with the `workspace_symbol` function
"""
for ignore_folder in jedi_ignore_folders:
if f"/{ignore_folder}/" in path_check:
return True
return False
@SERVER.feature(WORKSPACE_SYMBOL)
def workspace_symbol(
server: JediLanguageServer, params: WorkspaceSymbolParams
) -> Optional[List[SymbolInformation]]:
"""Document Python workspace symbols.
Returns up to maxSymbols, or all symbols if maxSymbols is <= 0, ignoring
the following symbols:
1. Those that don't have a module_path associated with them (built-ins)
2. Those that are not rooted in the current workspace.
3. Those whose folders contain a directory that is ignored (.venv, etc)
"""
if not server.project:
return None
names = server.project.complete_search(params.query)
workspace_root = server.workspace.root_path
ignore_folders = (
server.initialization_options.workspace.symbols.ignore_folders
)
unignored_names = (
name
for name in names
if name.module_path is not None
and str(name.module_path).startswith(workspace_root)
and not _ignore_folder(str(name.module_path), ignore_folders)
)
_symbols = (
symbol
for symbol in (
jedi_utils.lsp_symbol_information(name) for name in unignored_names
)
if symbol is not None
)
max_symbols = server.initialization_options.workspace.symbols.max_symbols
symbols = (
list(itertools.islice(_symbols, max_symbols))
if max_symbols > 0
else list(_symbols)
)
return symbols if symbols else None
@SERVER.feature(TEXT_DOCUMENT_RENAME)
def rename(
server: JediLanguageServer, params: RenameParams
) -> Optional[WorkspaceEdit]:
"""Rename a symbol across a workspace."""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
jedi_lines = jedi_utils.line_column(params.position)
try:
refactoring = jedi_script.rename(*jedi_lines, new_name=params.new_name)
except RefactoringError:
return None
changes = text_edit_utils.lsp_document_changes(
server.workspace, refactoring
)
return WorkspaceEdit(document_changes=changes) if changes else None
@SERVER.feature(
TEXT_DOCUMENT_CODE_ACTION,
CodeActionOptions(
code_action_kinds=[
CodeActionKind.RefactorInline,
CodeActionKind.RefactorExtract,
],
),
)
def code_action(
server: JediLanguageServer, params: CodeActionParams
) -> Optional[List[CodeAction]]:
"""Get code actions.
Currently supports:
1. Inline variable
2. Extract variable
3. Extract function
"""
document = server.workspace.get_document(params.text_document.uri)
jedi_script = jedi_utils.script(server.project, document)
code_actions = []
jedi_lines = jedi_utils.line_column(params.range.start)
jedi_lines_extract = jedi_utils.line_column_range(params.range)
try:
if params.range.start.line != params.range.end.line:
# refactor this at some point; control flow with exception == bad
raise RefactoringError("inline only viable for single-line range")
inline_refactoring = jedi_script.inline(*jedi_lines)
except (RefactoringError, AttributeError, IndexError):
inline_changes = []
else:
inline_changes = text_edit_utils.lsp_document_changes(
server.workspace, inline_refactoring
)
if inline_changes:
code_actions.append(
CodeAction(
title="Inline variable",
kind=CodeActionKind.RefactorInline,
edit=WorkspaceEdit(
document_changes=inline_changes,
),
)
)
extract_var = (
server.initialization_options.code_action.name_extract_variable
)
try:
extract_variable_refactoring = jedi_script.extract_variable(
new_name=extract_var, **jedi_lines_extract
)
except (RefactoringError, AttributeError, IndexError):
extract_variable_changes = []
else:
extract_variable_changes = text_edit_utils.lsp_document_changes(
server.workspace, extract_variable_refactoring
)
if extract_variable_changes:
code_actions.append(
CodeAction(
title=f"Extract expression into variable '{extract_var}'",
kind=CodeActionKind.RefactorExtract,
edit=WorkspaceEdit(
document_changes=extract_variable_changes,
),
)
)
extract_func = (
server.initialization_options.code_action.name_extract_function
)
try:
extract_function_refactoring = jedi_script.extract_function(
new_name=extract_func, **jedi_lines_extract
)
except (RefactoringError, AttributeError, IndexError):
extract_function_changes = []
else:
extract_function_changes = text_edit_utils.lsp_document_changes(
server.workspace, extract_function_refactoring
)
if extract_function_changes:
code_actions.append(
CodeAction(
title=f"Extract expression into function '{extract_func}'",
kind=CodeActionKind.RefactorExtract,
edit=WorkspaceEdit(
document_changes=extract_function_changes,
),
)
)
return code_actions if code_actions else None
@SERVER.feature(WORKSPACE_DID_CHANGE_CONFIGURATION)
def did_change_configuration(
server: JediLanguageServer, # pylint: disable=unused-argument
params: DidChangeConfigurationParams, # pylint: disable=unused-argument
) -> None:
"""Implement event for workspace/didChangeConfiguration.
Currently does nothing, but necessary for pygls. See::
<https://github.com/pappasam/jedi-language-server/issues/58>
"""
# Static capability or initializeOptions functions that rely on a specific
# client capability or user configuration. These are associated with
# JediLanguageServer within JediLanguageServerProtocol.lsp_initialize
@jedi_utils.debounce(1, keyed_by="uri")
def _publish_diagnostics(server: JediLanguageServer, uri: str) -> None:
"""Helper function to publish diagnostics for a file."""
# The debounce decorator delays the execution by 1 second
# canceling notifications that happen in that interval.
# Since this function is executed after a delay, we need to check
# whether the document still exists
if uri not in server.workspace.documents:
return
doc = server.workspace.get_document(uri)
diagnostic = jedi_utils.lsp_python_diagnostic(uri, doc.source)
diagnostics = [diagnostic] if diagnostic else []
server.publish_diagnostics(uri, diagnostics)
# TEXT_DOCUMENT_DID_SAVE
def did_save_diagnostics(
server: JediLanguageServer, params: DidSaveTextDocumentParams
) -> None:
"""Actions run on textDocument/didSave: diagnostics."""
_publish_diagnostics(server, params.text_document.uri)
def did_save_default(
server: JediLanguageServer, # pylint: disable=unused-argument
params: DidSaveTextDocumentParams, # pylint: disable=unused-argument
) -> None:
"""Actions run on textDocument/didSave: default."""
# TEXT_DOCUMENT_DID_CHANGE
def did_change_diagnostics(
server: JediLanguageServer, params: DidChangeTextDocumentParams
) -> None:
"""Actions run on textDocument/didChange: diagnostics."""
_publish_diagnostics(server, params.text_document.uri)
def did_change_default(
server: JediLanguageServer, # pylint: disable=unused-argument
params: DidChangeTextDocumentParams, # pylint: disable=unused-argument
) -> None:
"""Actions run on textDocument/didChange: default."""
# TEXT_DOCUMENT_DID_OPEN
def did_open_diagnostics(
server: JediLanguageServer, params: DidOpenTextDocumentParams
) -> None:
"""Actions run on textDocument/didOpen: diagnostics."""
_publish_diagnostics(server, params.text_document.uri)
def did_open_default(
server: JediLanguageServer, # pylint: disable=unused-argument
params: DidOpenTextDocumentParams, # pylint: disable=unused-argument
) -> None:
"""Actions run on textDocument/didOpen: default."""
# TEXT_DOCUMENT_DID_CLOSE
def did_close_diagnostics(
server: JediLanguageServer, params: DidCloseTextDocumentParams
) -> None:
"""Actions run on textDocument/didClose: diagnostics."""
server.publish_diagnostics(params.text_document.uri, [])
def did_close_default(
server: JediLanguageServer, # pylint: disable=unused-argument
params: DidCloseTextDocumentParams, # pylint: disable=unused-argument
) -> None:
"""Actions run on textDocument/didClose: default."""
def _choose_markup(server: JediLanguageServer) -> MarkupKind:
"""Returns the preferred or first of supported markup kinds."""
markup_preferred = server.initialization_options.markup_kind_preferred
markup_supported = get_capability(
server.client_capabilities,
"text_document.completion.completion_item.documentation_format",
[MarkupKind.PlainText],
)
return MarkupKind(
markup_preferred
if markup_preferred in markup_supported
else markup_supported[0]
)