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# Copyright 2017-2020 Palantir Technologies, Inc.
# Copyright 2021- Python Language Server Contributors.
from pyflakes import api as pyflakes_api
from pyflakes import messages
from pylsp import hookimpl, lsp
# Pyflakes messages that should be reported as Errors instead of Warns
PYFLAKES_ERROR_MESSAGES = (
messages.UndefinedName,
messages.UndefinedExport,
messages.UndefinedLocal,
messages.DuplicateArgument,
messages.FutureFeatureNotDefined,
messages.ReturnOutsideFunction,
messages.YieldOutsideFunction,
messages.ContinueOutsideLoop,
messages.BreakOutsideLoop,
messages.TwoStarredExpressions,
)
@hookimpl
def pylsp_lint(workspace, document):
with workspace.report_progress("lint: pyflakes"):
reporter = PyflakesDiagnosticReport(document.lines)
pyflakes_api.check(
document.source.encode("utf-8"), document.path, reporter=reporter
)
return reporter.diagnostics
class PyflakesDiagnosticReport:
def __init__(self, lines) -> None:
self.lines = lines
self.diagnostics = []
def unexpectedError(self, _filename, msg) -> None: # pragma: no cover
err_range = {
"start": {"line": 0, "character": 0},
"end": {"line": 0, "character": 0},
}
self.diagnostics.append(
{
"source": "pyflakes",
"range": err_range,
"message": msg,
"severity": lsp.DiagnosticSeverity.Error,
}
)
def syntaxError(self, _filename, msg, lineno, offset, text) -> None:
# We've seen that lineno and offset can sometimes be None
lineno = lineno or 1
offset = offset or 0
# could be None if the error is due to an invalid encoding
# see e.g. https://github.com/python-lsp/python-lsp-server/issues/429
text = text or ""
err_range = {
"start": {"line": lineno - 1, "character": offset},
"end": {"line": lineno - 1, "character": offset + len(text)},
}
self.diagnostics.append(
{
"source": "pyflakes",
"range": err_range,
"message": msg,
"severity": lsp.DiagnosticSeverity.Error,
}
)
def flake(self, message) -> None:
"""Get message like <filename>:<lineno>: <msg>"""
err_range = {
"start": {"line": message.lineno - 1, "character": message.col},
"end": {
"line": message.lineno - 1,
"character": len(self.lines[message.lineno - 1]),
},
}
severity = lsp.DiagnosticSeverity.Warning
for message_type in PYFLAKES_ERROR_MESSAGES:
if isinstance(message, message_type):
severity = lsp.DiagnosticSeverity.Error
break
self.diagnostics.append(
{
"source": "pyflakes",
"range": err_range,
"message": message.message % message.message_args,
"severity": severity,
}
)
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