Tests/varLib/builder_test.py

from fontTools.varLib.builder import buildVarData
import pytest


@pytest.mark.parametrize(
    "region_indices, items, expected_num_shorts",
    [
        ([], [], 0),
        ([0], [[1]], 0),
        ([0], [[128]], 1),
        ([0, 1, 2], [[128, 1, 2], [3, -129, 5], [6, 7, 8]], 2),
        ([0, 1, 2], [[0, 128, 2], [3, 4, 5], [6, 7, -129]], 3),
        ([0], [[32768]], 0x8001),
        ([0, 1, 2], [[32768, 1, 2], [3, -129, 5], [6, 7, 8]], 0x8001),
        ([0, 1, 2], [[32768, 1, 2], [3, -32769, 5], [6, 7, 8]], 0x8002),
        ([0, 1, 2], [[0, 32768, 2], [3, 4, 5], [6, 7, -32769]], 0x8003),
    ],
    ids=[
        "0_regions_0_deltas",
        "1_region_1_uint8",
        "1_region_1_short",
        "3_regions_2_shorts_ordered",
        "3_regions_2_shorts_unordered",
        "1_region_1_long",
        "3_regions_1_long_ordered",
        "3_regions_2_longs_ordered",
        "3_regions_2_longs_unordered",
    ],
)
def test_buildVarData_no_optimize(region_indices, items, expected_num_shorts):
    data = buildVarData(region_indices, items, optimize=False)

    assert data.ItemCount == len(items)
    assert data.NumShorts == expected_num_shorts
    assert data.VarRegionCount == len(region_indices)
    assert data.VarRegionIndex == region_indices
    assert data.Item == items


@pytest.mark.parametrize(
    [
        "region_indices",
        "items",
        "expected_num_shorts",
        "expected_regions",
        "expected_items",
    ],
    [
        (
            [0, 1, 2],
            [[0, 1, 2], [3, 4, 5], [6, 7, 8]],
            0,
            [0, 1, 2],
            [[0, 1, 2], [3, 4, 5], [6, 7, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 128, 2], [3, 4, 5], [6, 7, 8]],
            1,
            [1, 0, 2],
            [[128, 0, 2], [4, 3, 5], [7, 6, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 1, 128], [3, 4, 5], [6, -129, 8]],
            2,
            [1, 2, 0],
            [[1, 128, 0], [4, 5, 3], [-129, 8, 6]],
        ),
        (
            [0, 1, 2],
            [[128, 1, -129], [3, 4, 5], [6, 7, 8]],
            2,
            [0, 2, 1],
            [[128, -129, 1], [3, 5, 4], [6, 8, 7]],
        ),
        (
            [0, 1, 2],
            [[0, 1, 128], [3, -129, 5], [256, 7, 8]],
            3,
            [0, 1, 2],
            [[0, 1, 128], [3, -129, 5], [256, 7, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 128, 2], [0, 4, 5], [0, 7, 8]],
            1,
            [1, 2],
            [[128, 2], [4, 5], [7, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 32768, 2], [3, 4, 5], [6, 7, 8]],
            0x8001,
            [1, 0, 2],
            [[32768, 0, 2], [4, 3, 5], [7, 6, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 1, 32768], [3, 4, 5], [6, -32769, 8]],
            0x8002,
            [1, 2, 0],
            [[1, 32768, 0], [4, 5, 3], [-32769, 8, 6]],
        ),
        (
            [0, 1, 2],
            [[32768, 1, -32769], [3, 4, 5], [6, 7, 8]],
            0x8002,
            [0, 2, 1],
            [[32768, -32769, 1], [3, 5, 4], [6, 8, 7]],
        ),
        (
            [0, 1, 2],
            [[0, 1, 32768], [3, -32769, 5], [65536, 7, 8]],
            0x8003,
            [0, 1, 2],
            [[0, 1, 32768], [3, -32769, 5], [65536, 7, 8]],
        ),
        (
            [0, 1, 2],
            [[0, 32768, 2], [0, 4, 5], [0, 7, 8]],
            0x8001,
            [1, 2],
            [[32768, 2], [4, 5], [7, 8]],
        ),
    ],
    ids=[
        "0/3_shorts_no_reorder",
        "1/3_shorts_reorder",
        "2/3_shorts_reorder",
        "2/3_shorts_same_row_reorder",
        "3/3_shorts_no_reorder",
        "1/3_shorts_1/3_zeroes",
        "1/3_longs_reorder",
        "2/3_longs_reorder",
        "2/3_longs_same_row_reorder",
        "3/3_longs_no_reorder",
        "1/3_longs_1/3_zeroes",
    ],
)
def test_buildVarData_optimize(
    region_indices, items, expected_num_shorts, expected_regions, expected_items
):
    data = buildVarData(region_indices, items, optimize=True)

    assert data.ItemCount == len(items)
    assert data.NumShorts == expected_num_shorts
    assert data.VarRegionCount == len(expected_regions)
    assert data.VarRegionIndex == expected_regions
    assert data.Item == expected_items


if __name__ == "__main__":
    import sys

    sys.exit(pytest.main(sys.argv))