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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
import libcst as cst
from libcst.metadata.span_provider import (
byte_length_in_utf8,
ByteSpanPositionProvider,
CodeSpan,
SpanProvidingCodegenState,
)
from libcst.testing.utils import UnitTest
class SpanProvidingCodegenStateTest(UnitTest):
def test_initial_position(self) -> None:
state = SpanProvidingCodegenState(
" " * 4,
"\n",
get_length=byte_length_in_utf8,
provider=ByteSpanPositionProvider(),
)
self.assertEqual(state.position, 0)
def test_add_token(self) -> None:
state = SpanProvidingCodegenState(
" " * 4,
"\n",
get_length=byte_length_in_utf8,
provider=ByteSpanPositionProvider(),
)
state.add_token("12")
self.assertEqual(state.position, 2)
def test_add_non_ascii_token(self) -> None:
state = SpanProvidingCodegenState(
" " * 4,
"\n",
get_length=byte_length_in_utf8,
provider=ByteSpanPositionProvider(),
)
state.add_token("🤡")
self.assertEqual(state.position, 4)
def test_add_indent_tokens(self) -> None:
state = SpanProvidingCodegenState(
" " * 4,
"\n",
get_length=byte_length_in_utf8,
provider=ByteSpanPositionProvider(),
)
state.increase_indent(state.default_indent)
state.add_indent_tokens()
self.assertEqual(state.position, 4)
def test_span(self) -> None:
node = cst.Pass()
state = SpanProvidingCodegenState(
" " * 4,
"\n",
get_length=byte_length_in_utf8,
provider=ByteSpanPositionProvider(),
)
state.before_codegen(node)
state.add_token(" ")
with state.record_syntactic_position(node):
state.add_token("pass")
state.add_token(" ")
state.after_codegen(node)
span = state.provider._computed[node]
self.assertEqual(span.start, 1)
self.assertEqual(span.length, 4)
class ByteSpanPositionProviderTest(UnitTest):
def test_visitor_provider(self) -> None:
test = self
class SomeVisitor(cst.CSTVisitor):
METADATA_DEPENDENCIES = (ByteSpanPositionProvider,)
def visit_Pass(self, node: cst.Pass) -> None:
test.assertEqual(
self.get_metadata(ByteSpanPositionProvider, node),
CodeSpan(start=0, length=4),
)
wrapper = cst.MetadataWrapper(cst.parse_module("pass"))
wrapper.visit(SomeVisitor())
def test_batchable_provider(self) -> None:
test = self
class SomeVisitor(cst.BatchableCSTVisitor):
METADATA_DEPENDENCIES = (ByteSpanPositionProvider,)
def visit_Pass(self, node: cst.Pass) -> None:
test.assertEqual(
self.get_metadata(ByteSpanPositionProvider, node),
CodeSpan(start=0, length=4),
)
wrapper = cst.MetadataWrapper(cst.parse_module("pass"))
wrapper.visit_batched([SomeVisitor()])
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