Add compatibility for Pyodide-tagged wheels

src/packaging/tags.py

@@ -549,6 +549,13 @@ def _linux_platforms(is_32bit: bool = _32_BIT_INTERPRETER) -> Iterator[str]:
         yield f"linux_{arch}"
 
 
+def _emscripten_platforms() -> Iterator[str]:
+    pyemscripten_abi_version = sysconfig.get_config_var("PYEMSCRIPTEN_ABI_VERSION")
+    if pyemscripten_abi_version:
+        yield f"pyemscripten_{pyemscripten_abi_version}_wasm32"
+    yield from _generic_platforms()
+
+
 def _generic_platforms() -> Iterator[str]:
     yield _normalize_string(sysconfig.get_platform())
 
@@ -563,6 +570,8 @@ def platform_tags() -> Iterator[str]:
         return ios_platforms()
     elif platform.system() == "Linux":
         return _linux_platforms()
+    elif platform.system() == "Emscripten":
+        return _emscripten_platforms()
     else:
         return _generic_platforms()
 

tests/test_tags.py

@@ -1465,6 +1465,44 @@ def test_cpython_first_none_any_tag(self, monkeypatch):
         interpreter = f"cp{tags.interpreter_version()}"
         assert tag == tags.Tag(interpreter, "none", "any")
 
+    def test_emscripten(self, mock_interpreter_name, monkeypatch):
+        expected_interpreter = "cp" + tags._version_nodot(sys.version_info[:2])
+        if mock_interpreter_name("CPython"):
+            monkeypatch.setattr(
+                tags, "_cpython_abis", lambda _1, _2: [expected_interpreter]
+            )
+        monkeypatch.setattr(platform, "system", lambda: "Emscripten")
+        monkeypatch.setattr(
+            sysconfig, "get_platform", lambda: "emscripten-3.1.58-wasm32"
+        )
+        assert list(tags.platform_tags()) == ["emscripten_3_1_58_wasm32"]
+        result = list(tags.sys_tags())
+        assert result[0] == tags.Tag(
+            expected_interpreter, expected_interpreter, "emscripten_3_1_58_wasm32"
+        )
+
+    def test_pyemscripten(self, mock_interpreter_name, monkeypatch):
+        expected_interpreter = "cp" + tags._version_nodot(sys.version_info[:2])
+        monkeypatch.setitem(
+            sysconfig.get_config_vars(), "PYEMSCRIPTEN_ABI_VERSION", "2024_0"
+        )
+        if mock_interpreter_name("CPython"):
+            monkeypatch.setattr(
+                tags, "_cpython_abis", lambda _1, _2: [expected_interpreter]
+            )
+        monkeypatch.setattr(platform, "system", lambda: "Emscripten")
+        monkeypatch.setattr(
+            sysconfig, "get_platform", lambda: "emscripten-3.1.58-wasm32"
+        )
+        assert list(tags.platform_tags()) == [
+            "pyemscripten_2024_0_wasm32",
+            "emscripten_3_1_58_wasm32",
+        ]
+        result = list(tags.sys_tags())
+        assert result[0] == tags.Tag(
+            expected_interpreter, expected_interpreter, "pyemscripten_2024_0_wasm32"
+        )
+
 
 class TestBitness:
     def teardown_method(self):