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import pytest
from textual.app import App, ComposeResult
from textual.widgets import TextArea
from textual.widgets.text_area import LanguageDoesNotExist
class TextAreaApp(App):
def compose(self) -> ComposeResult:
yield TextArea("print('hello')", language="python")
async def test_setting_builtin_language_via_constructor():
class MyTextAreaApp(App):
def compose(self) -> ComposeResult:
yield TextArea("print('hello')", language="python")
app = MyTextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
assert text_area.language == "python"
text_area.language = "markdown"
assert text_area.language == "markdown"
async def test_setting_builtin_language_via_attribute():
class MyTextAreaApp(App):
def compose(self) -> ComposeResult:
text_area = TextArea("print('hello')")
text_area.language = "python"
yield text_area
app = MyTextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
assert text_area.language == "python"
text_area.language = "markdown"
assert text_area.language == "markdown"
async def test_setting_language_to_none():
app = TextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
text_area.language = None
assert text_area.language is None
@pytest.mark.syntax
async def test_setting_unknown_language():
app = TextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
with pytest.raises(LanguageDoesNotExist):
text_area.language = "this-language-doesnt-exist"
@pytest.mark.syntax
async def test_register_language():
app = TextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
from textual._tree_sitter import get_language
language = get_language("python")
assert language is not None
# ...and register it with no highlights
text_area.register_language("python-test", language, "")
assert "python-test" in text_area.available_languages
text_area.language = "python-test"
assert text_area.language == "python-test"
@pytest.mark.syntax
async def test_update_highlight_query():
app = TextAreaApp()
async with app.run_test():
text_area = app.query_one(TextArea)
# Before registering the language, we have highlights as expected.
assert len(text_area._highlights) > 0
# Overwriting the highlight query for Python...
text_area.update_highlight_query("python", "")
# We've overridden the highlight query with a blank one, so there are no highlights.
assert text_area._highlights == {}
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