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import pytest
import altair as alt
from altair.utils.mimebundle import spec_to_mimebundle
try:
import altair_saver # noqa: F401
except ImportError:
altair_saver = None
try:
import vl_convert as vlc # noqa: F401
except ImportError:
vlc = None
@pytest.fixture
def vegalite_spec():
return {
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"description": "A simple bar chart with embedded data.",
"data": {
"values": [
{"a": "A", "b": 28},
{"a": "B", "b": 55},
{"a": "C", "b": 43},
{"a": "D", "b": 91},
{"a": "E", "b": 81},
{"a": "F", "b": 53},
{"a": "G", "b": 19},
{"a": "H", "b": 87},
{"a": "I", "b": 52},
]
},
"mark": {"type": "bar"},
"encoding": {
"x": {"field": "a", "type": "ordinal"},
"y": {"field": "b", "type": "quantitative"},
},
}
@pytest.fixture
def vega_spec():
return {
"$schema": "https://vega.github.io/schema/vega/v5.json",
"axes": [
{
"aria": False,
"domain": False,
"grid": True,
"gridScale": "x",
"labels": False,
"maxExtent": 0,
"minExtent": 0,
"orient": "left",
"scale": "y",
"tickCount": {"signal": "ceil(height/40)"},
"ticks": False,
"zindex": 0,
},
{
"grid": False,
"labelAlign": "right",
"labelAngle": 270,
"labelBaseline": "middle",
"orient": "bottom",
"scale": "x",
"title": "a",
"zindex": 0,
},
{
"grid": False,
"labelOverlap": True,
"orient": "left",
"scale": "y",
"tickCount": {"signal": "ceil(height/40)"},
"title": "b",
"zindex": 0,
},
],
"background": "white",
"data": [
{
"name": "source_0",
"values": [
{"a": "A", "b": 28},
{"a": "B", "b": 55},
{"a": "C", "b": 43},
{"a": "D", "b": 91},
{"a": "E", "b": 81},
{"a": "F", "b": 53},
{"a": "G", "b": 19},
{"a": "H", "b": 87},
{"a": "I", "b": 52},
],
},
{
"name": "data_0",
"source": "source_0",
"transform": [
{
"as": ["b_start", "b_end"],
"field": "b",
"groupby": ["a"],
"offset": "zero",
"sort": {"field": [], "order": []},
"type": "stack",
},
{
"expr": 'isValid(datum["b"]) && isFinite(+datum["b"])',
"type": "filter",
},
],
},
],
"description": "A simple bar chart with embedded data.",
"height": 200,
"marks": [
{
"encode": {
"update": {
"ariaRoleDescription": {"value": "bar"},
"description": {
"signal": '"a: " + (isValid(datum["a"]) ? datum["a"] : ""+datum["a"]) + "; b: " + (format(datum["b"], ""))'
},
"fill": {"value": "#4c78a8"},
"width": {"signal": "max(0.25, bandwidth('x'))"},
"x": {"field": "a", "scale": "x"},
"y": {"field": "b_end", "scale": "y"},
"y2": {"field": "b_start", "scale": "y"},
}
},
"from": {"data": "data_0"},
"name": "marks",
"style": ["bar"],
"type": "rect",
}
],
"padding": 5,
"scales": [
{
"domain": {"data": "data_0", "field": "a", "sort": True},
"name": "x",
"paddingInner": 0.1,
"paddingOuter": 0.05,
"range": {"step": {"signal": "x_step"}},
"type": "band",
},
{
"domain": {"data": "data_0", "fields": ["b_start", "b_end"]},
"name": "y",
"nice": True,
"range": [{"signal": "height"}, 0],
"type": "linear",
"zero": True,
},
],
"signals": [
{"name": "x_step", "value": 20},
{
"name": "width",
"update": "bandspace(domain('x').length, 0.1, 0.05) * x_step",
},
],
"style": "cell",
}
@pytest.mark.save_engine
@pytest.mark.parametrize("engine", ["vl-convert", "altair_saver", None])
def test_vegalite_to_vega_mimebundle(engine, vegalite_spec, vega_spec):
if engine == "vl-convert" and vlc is None:
pytest.skip("vl_convert not importable; cannot run mimebundle tests")
elif engine == "altair_saver" and altair_saver is None:
pytest.skip("altair_saver not importable; cannot run mimebundle tests")
elif vlc is None and altair_saver is None:
pytest.skip(
"Neither altair_saver nor vl_convert are importable;"
+ " cannot run mimebundle tests"
)
bundle = spec_to_mimebundle(
spec=vegalite_spec,
format="vega",
mode="vega-lite",
vega_version=alt.VEGA_VERSION,
vegalite_version=alt.VEGALITE_VERSION,
vegaembed_version=alt.VEGAEMBED_VERSION,
engine=engine,
)
assert bundle == {"application/vnd.vega.v5+json": vega_spec}
def test_spec_to_vegalite_mimebundle(vegalite_spec):
bundle = spec_to_mimebundle(
spec=vegalite_spec,
mode="vega-lite",
format="vega-lite",
vegalite_version=alt.VEGALITE_VERSION,
)
assert bundle == {"application/vnd.vegalite.v5+json": vegalite_spec}
def test_spec_to_vega_mimebundle(vega_spec):
# ValueError: mode must be 'vega-lite'
with pytest.raises(ValueError):
spec_to_mimebundle(
spec=vega_spec,
mode="vega",
format="vega",
vega_version=alt.VEGA_VERSION,
)
def test_spec_to_json_mimebundle():
bundle = spec_to_mimebundle(
spec=vegalite_spec,
mode="vega-lite",
format="json",
)
assert bundle == {"application/json": vegalite_spec}
|
