Permit superclass to subclass lazy typing

pydra/engine/helpers.py

@@ -263,7 +263,9 @@ def make_klass(spec):
                     **kwargs,
                 )
             checker_label = f"'{name}' field of {spec.name}"
-            type_checker = TypeParser[newfield.type](newfield.type, label=checker_label)
+            type_checker = TypeParser[newfield.type](
+                newfield.type, label=checker_label, superclass_auto_cast=True
+            )
             if newfield.type in (MultiInputObj, MultiInputFile):
                 converter = attr.converters.pipe(ensure_list, type_checker)
             elif newfield.type in (MultiOutputObj, MultiOutputFile):

pydra/engine/specs.py

@@ -445,7 +445,7 @@ def collect_additional_outputs(self, inputs, output_dir, outputs):
                 ),
             ):
                 raise TypeError(
-                    f"Support for {fld.type} type, required for {fld.name} in {self}, "
+                    f"Support for {fld.type} type, required for '{fld.name}' in {self}, "
                     "has not been implemented in collect_additional_output"
                 )
             # assuming that field should have either default or metadata, but not both

pydra/engine/tests/test_node_task.py

@@ -133,21 +133,7 @@ def test_task_init_3a(
 
 
 def test_task_init_4():
-    """task with interface and inputs. splitter set using split method"""
-    nn = fun_addtwo(name="NA")
-    nn.split(splitter="a", a=[3, 5])
-    assert np.allclose(nn.inputs.a, [3, 5])
-
-    assert nn.state.splitter == "NA.a"
-    assert nn.state.splitter_rpn == ["NA.a"]
-
-    nn.state.prepare_states(nn.inputs)
-    assert nn.state.states_ind == [{"NA.a": 0}, {"NA.a": 1}]
-    assert nn.state.states_val == [{"NA.a": 3}, {"NA.a": 5}]
-
-
-def test_task_init_4a():
-    """task with a splitter and inputs set in the split method"""
+    """task with interface splitter and inputs set in the split method"""
     nn = fun_addtwo(name="NA")
     nn.split(splitter="a", a=[3, 5])
     assert np.allclose(nn.inputs.a, [3, 5])

pydra/utils/tests/test_typing.py

@@ -1,5 +1,6 @@
 import os
 import itertools
+import sys
 import typing as ty
 from pathlib import Path
 import tempfile
@@ -8,13 +9,16 @@
 from ...engine.specs import File, LazyOutField
 from ..typing import TypeParser
 from pydra import Workflow
-from fileformats.application import Json
+from fileformats.application import Json, Yaml, Xml
 from .utils import (
     generic_func_task,
     GenericShellTask,
     specific_func_task,
     SpecificShellTask,
+    other_specific_func_task,
+    OtherSpecificShellTask,
     MyFormatX,
+    MyOtherFormatX,
     MyHeader,
 )
 
@@ -164,6 +168,18 @@ def test_type_check_nested8():
         )(lz(ty.List[float]))
 
 
+def test_type_check_permit_superclass():
+    # Typical case as Json is subclass of File
+    TypeParser(ty.List[File])(lz(ty.List[Json]))
+    # Permissive super class, as File is superclass of Json
+    TypeParser(ty.List[Json], superclass_auto_cast=True)(lz(ty.List[File]))
+    with pytest.raises(TypeError, match="Cannot coerce"):
+        TypeParser(ty.List[Json], superclass_auto_cast=False)(lz(ty.List[File]))
+    # Fails because Yaml is neither sub or super class of Json
+    with pytest.raises(TypeError, match="Cannot coerce"):
+        TypeParser(ty.List[Json], superclass_auto_cast=True)(lz(ty.List[Yaml]))
+
+
 def test_type_check_fail1():
     with pytest.raises(TypeError, match="Wrong number of type arguments in tuple"):
         TypeParser(ty.Tuple[int, int, int])(lz(ty.Tuple[float, float, float, float]))
@@ -538,7 +554,17 @@ def specific_task(request):
         assert False
 
 
-def test_typing_cast(tmp_path, generic_task, specific_task):
+@pytest.fixture(params=["func", "shell"])
+def other_specific_task(request):
+    if request.param == "func":
+        return other_specific_func_task
+    elif request.param == "shell":
+        return OtherSpecificShellTask
+    else:
+        assert False
+
+
+def test_typing_implicit_cast_from_super(tmp_path, generic_task, specific_task):
     """Check the casting of lazy fields and whether specific file-sets can be recovered
     from generic `File` classes"""
 
@@ -562,33 +588,86 @@ def test_typing_cast(tmp_path, generic_task, specific_task):
         )
     )
 
+    wf.add(
+        specific_task(
+            in_file=wf.generic.lzout.out,
+            name="specific2",
+        )
+    )
+
+    wf.set_output(
+        [
+            ("out_file", wf.specific2.lzout.out),
+        ]
+    )
+
+    in_file = MyFormatX.sample()
+
+    result = wf(in_file=in_file, plugin="serial")
+
+    out_file: MyFormatX = result.output.out_file
+    assert type(out_file) is MyFormatX
+    assert out_file.parent != in_file.parent
+    assert type(out_file.header) is MyHeader
+    assert out_file.header.parent != in_file.header.parent
+
+
+def test_typing_cast(tmp_path, specific_task, other_specific_task):
+    """Check the casting of lazy fields and whether specific file-sets can be recovered
+    from generic `File` classes"""
+
+    wf = Workflow(
+        name="test",
+        input_spec={"in_file": MyFormatX},
+        output_spec={"out_file": MyFormatX},
+    )
+
+    wf.add(
+        specific_task(
+            in_file=wf.lzin.in_file,
+            name="entry",
+        )
+    )
+
+    with pytest.raises(TypeError, match="Cannot coerce"):
+        # No cast of generic task output to MyFormatX
+        wf.add(  # Generic task
+            other_specific_task(
+                in_file=wf.entry.lzout.out,
+                name="inner",
+            )
+        )
+
+    wf.add(  # Generic task
+        other_specific_task(
+            in_file=wf.entry.lzout.out.cast(MyOtherFormatX),
+            name="inner",
+        )
+    )
+
     with pytest.raises(TypeError, match="Cannot coerce"):
         # No cast of generic task output to MyFormatX
         wf.add(
             specific_task(
-                in_file=wf.generic.lzout.out,
-                name="specific2",
+                in_file=wf.inner.lzout.out,
+                name="exit",
             )
         )
 
     wf.add(
         specific_task(
-            in_file=wf.generic.lzout.out.cast(MyFormatX),
-            name="specific2",
+            in_file=wf.inner.lzout.out.cast(MyFormatX),
+            name="exit",
         )
     )
 
     wf.set_output(
         [
-            ("out_file", wf.specific2.lzout.out),
+            ("out_file", wf.exit.lzout.out),
         ]
     )
 
-    my_fspath = tmp_path / "in_file.my"
-    hdr_fspath = tmp_path / "in_file.hdr"
-    my_fspath.write_text("my-format")
-    hdr_fspath.write_text("my-header")
-    in_file = MyFormatX([my_fspath, hdr_fspath])
+    in_file = MyFormatX.sample()
 
     result = wf(in_file=in_file, plugin="serial")
 
@@ -611,6 +690,63 @@ def test_type_is_subclass3():
     assert TypeParser.is_subclass(ty.Type[Json], ty.Type[File])
 
 
+def test_union_is_subclass1():
+    assert TypeParser.is_subclass(ty.Union[Json, Yaml], ty.Union[Json, Yaml, Xml])
+
+
+def test_union_is_subclass2():
+    assert not TypeParser.is_subclass(ty.Union[Json, Yaml, Xml], ty.Union[Json, Yaml])
+
+
+def test_union_is_subclass3():
+    assert TypeParser.is_subclass(Json, ty.Union[Json, Yaml])
+
+
+def test_union_is_subclass4():
+    assert not TypeParser.is_subclass(ty.Union[Json, Yaml], Json)
+
+
+def test_generic_is_subclass1():
+    assert TypeParser.is_subclass(ty.List[int], list)
+
+
+def test_generic_is_subclass2():
+    assert not TypeParser.is_subclass(list, ty.List[int])
+
+
+def test_generic_is_subclass3():
+    assert not TypeParser.is_subclass(ty.List[float], ty.List[int])
+
+
+@pytest.mark.skipif(
+    sys.version_info < (3, 9), reason="Cannot subscript tuple in < Py3.9"
+)
+def test_generic_is_subclass4():
+    class MyTuple(tuple):
+        pass
+
+    class A:
+        pass
+
+    class B(A):
+        pass
+
+    assert TypeParser.is_subclass(MyTuple[A], ty.Tuple[A])
+    assert TypeParser.is_subclass(ty.Tuple[B], ty.Tuple[A])
+    assert TypeParser.is_subclass(MyTuple[B], ty.Tuple[A])
+    assert not TypeParser.is_subclass(ty.Tuple[A], ty.Tuple[B])
+    assert not TypeParser.is_subclass(ty.Tuple[A], MyTuple[A])
+    assert not TypeParser.is_subclass(MyTuple[A], ty.Tuple[B])
+    assert TypeParser.is_subclass(MyTuple[A, int], ty.Tuple[A, int])
+    assert TypeParser.is_subclass(ty.Tuple[B, int], ty.Tuple[A, int])
+    assert TypeParser.is_subclass(MyTuple[B, int], ty.Tuple[A, int])
+    assert TypeParser.is_subclass(MyTuple[int, B], ty.Tuple[int, A])
+    assert not TypeParser.is_subclass(MyTuple[B, int], ty.Tuple[int, A])
+    assert not TypeParser.is_subclass(MyTuple[int, B], ty.Tuple[A, int])
+    assert not TypeParser.is_subclass(MyTuple[B, int], ty.Tuple[A])
+    assert not TypeParser.is_subclass(MyTuple[B], ty.Tuple[A, int])
+
+
 def test_type_is_instance1():
     assert TypeParser.is_instance(File, ty.Type[File])
 

pydra/utils/tests/utils.py

@@ -1,12 +1,13 @@
 from fileformats.generic import File
-from fileformats.core.mixin import WithSeparateHeader
+from fileformats.core.mixin import WithSeparateHeader, WithMagicNumber
 from pydra import mark
 from pydra.engine.task import ShellCommandTask
 from pydra.engine import specs
 
 
-class MyFormat(File):
+class MyFormat(WithMagicNumber, File):
     ext = ".my"
+    magic_number = b"MYFORMAT"
 
 
 class MyHeader(File):
@@ -17,6 +18,12 @@ class MyFormatX(WithSeparateHeader, MyFormat):
     header_type = MyHeader
 
 
+class MyOtherFormatX(WithMagicNumber, WithSeparateHeader, File):
+    magic_number = b"MYFORMAT"
+    ext = ".my"
+    header_type = MyHeader
+
+
 @mark.task
 def generic_func_task(in_file: File) -> File:
     return in_file
@@ -118,3 +125,57 @@ class SpecificShellTask(ShellCommandTask):
     input_spec = specific_shell_input_spec
     output_spec = specific_shelloutput_spec
     executable = "echo"
+
+
+@mark.task
+def other_specific_func_task(in_file: MyOtherFormatX) -> MyOtherFormatX:
+    return in_file
+
+
+other_specific_shell_input_fields = [
+    (
+        "in_file",
+        MyOtherFormatX,
+        {
+            "help_string": "the input file",
+            "argstr": "",
+            "copyfile": "copy",
+            "sep": " ",
+        },
+    ),
+    (
+        "out",
+        str,
+        {
+            "help_string": "output file name",
+            "argstr": "",
+            "position": -1,
+            "output_file_template": "{in_file}",  # Pass through un-altered
+        },
+    ),
+]
+
+other_specific_shell_input_spec = specs.SpecInfo(
+    name="Input", fields=other_specific_shell_input_fields, bases=(specs.ShellSpec,)
+)
+
+other_specific_shell_output_fields = [
+    (
+        "out",
+        MyOtherFormatX,
+        {
+            "help_string": "output file",
+        },
+    ),
+]
+other_specific_shelloutput_spec = specs.SpecInfo(
+    name="Output",
+    fields=other_specific_shell_output_fields,
+    bases=(specs.ShellOutSpec,),
+)
+
+
+class OtherSpecificShellTask(ShellCommandTask):
+    input_spec = other_specific_shell_input_spec
+    output_spec = other_specific_shelloutput_spec
+    executable = "echo"