Add CI job for Pyodide (#1143)

I figured it was worth testing the Pyodide support (#1099) a bit more
comprehensively. The changes to the tests are just to skip the handful
of cases that Pyodide doesn't support related to I/O and threading.

.github/workflows/pyodide.yml

@@ -0,0 +1,64 @@
+# Copied from SymPy https://github.com/sympy/sympy/pull/27183
+
+name: Mathics3 (Pyodide)
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  pyodide-test:
+    runs-on: ubuntu-latest
+    env:
+      PYODIDE_VERSION: 0.27.0a2
+      # PYTHON_VERSION and EMSCRIPTEN_VERSION are determined by PYODIDE_VERSION.
+      # The appropriate versions can be found in the Pyodide repodata.json
+      # "info" field, or in Makefile.envs:
+      # https://github.com/pyodide/pyodide/blob/main/Makefile.envs#L2
+      PYTHON_VERSION: 3.12.1
+      EMSCRIPTEN_VERSION: 3.1.58
+      NODE_VERSION: 20
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Set up Emscripten toolchain
+        uses: mymindstorm/setup-emsdk@v14
+        with:
+          version: ${{ env.EMSCRIPTEN_VERSION }}
+          actions-cache-folder: emsdk-cache
+
+      - name: Install pyodide-build
+        run: pip install pyodide-build
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Set up Pyodide virtual environment and run tests
+        run: |
+          # Set up Pyodide virtual environment
+          pyodide xbuildenv install ${{ env.PYODIDE_VERSION }}
+          pyodide venv .venv-pyodide
+
+          # Activate the virtual environment
+          source .venv-pyodide/bin/activate
+
+          pip install "setuptools>=70.0.0" PyYAML click packaging pytest
+
+          git clone https://github.com/Mathics3/mathics-scanner.git
+          cd mathics-scanner/
+          pip install --no-build-isolation -e .
+          cd ..
+
+          make mathics/data/op-tables.json mathics/data/operator-tables.json
+          pip install --no-build-isolation -e .
+          make -j3 check

.gitignore

@@ -16,6 +16,7 @@
 /.cache
 /.gdbinit
 /.python-version
+/.pyodide-xbuildenv-*
 /Mathics.egg-info
 /Mathics3.egg-info
 ChangeLog

mathics/builtin/file_operations/file_properties.py

@@ -241,9 +241,6 @@ class SetFileDate(Builtin):
 
     >> SetFileDate[tmpfilename, {2002, 1, 1, 0, 0, 0.}, "Access"];
 
-    >> FileDate[tmpfilename, "Access"]
-     = {2002, 1, 1, 0, 0, 0.}
-
     #> DeleteFile[tmpfilename]
     """
 

mathics/builtin/files_io/files.py

@@ -461,8 +461,6 @@ class OpenRead(_OpenAction):
 
     The stream must be closed after using it to release the resource:
     >> Close[%];
-
-    S> Close[OpenRead["https://raw.githubusercontent.com/Mathics3/mathics-core/master/README.rst"]];
     """
 
     summary_text = "open a file for reading"

test/builtin/files_io/test_files.py

@@ -99,6 +99,10 @@ def test_close():
     ), f"temporary filename {temp_filename} should not appear"
 
 
+@pytest.mark.skipif(
+    sys.platform in ("emscripten",),
+    reason="Pyodide has restricted filesystem access",
+)
 @pytest.mark.parametrize(
     ("str_expr", "msgs", "str_expected", "fail_msg"),
     [
@@ -147,6 +151,12 @@ def test_close():
             "OpenRead[]",
             "",
         ),
+        (
+            'Close[OpenRead["https://raw.githubusercontent.com/Mathics3/mathics-core/master/README.rst"]];',
+            None,
+            "Null",
+            "",
+        ),
         (
             'fd=OpenRead["ExampleData/EinsteinSzilLetter.txt", BinaryFormat -> True, CharacterEncoding->"UTF8"]//Head',
             None,
@@ -314,6 +324,16 @@ def test_close():
         ),
         ("FilePrint[pathname]", None, "Null", ""),
         ("DeleteFile[pathname];Clear[pathname];", None, "Null", ""),
+        ('tmpfilename = $TemporaryDirectory <> "/tmp0";', None, "Null", ""),
+        ("Close[OpenWrite[tmpfilename]];", None, "Null", ""),
+        (
+            'SetFileDate[tmpfilename, {2002, 1, 1, 0, 0, 0.}, "Access"];',
+            None,
+            "Null",
+            "",
+        ),
+        ('FileDate[tmpfilename, "Access"]', None, "{2002, 1, 1, 0, 0, 0.}", ""),
+        ("DeleteFile[tmpfilename]", None, "Null", ""),
     ],
 )
 def test_private_doctests_files(str_expr, msgs, str_expected, fail_msg):

test/builtin/test_datentime.py

@@ -11,7 +11,7 @@
 
 
 @pytest.mark.skipif(
-    sys.platform in ("win32",) or hasattr(sys, "pyston_version_info"),
+    sys.platform in ("win32", "emscripten") or hasattr(sys, "pyston_version_info"),
     reason="TimeConstrained needs to be rewritten",
 )
 def test_timeremaining():

test/test_main.py

@@ -2,13 +2,20 @@
 import os.path as osp
 import re
 import subprocess
+import sys
+
+import pytest
 
 
 def get_testdir():
     filename = osp.normcase(osp.dirname(osp.abspath(__file__)))
     return osp.realpath(filename)
 
 
+@pytest.mark.skipif(
+    sys.platform in ("emscripten",),
+    reason="Pyodide does not support processes",
+)
 def test_cli():
     script_file = osp.join(get_testdir(), "data", "script.m")
 

test/test_returncode.py

@@ -1,13 +1,20 @@
 # -*- coding: utf-8 -*-
 import os.path as osp
 import subprocess
+import sys
+
+import pytest
 
 
 def get_testdir():
     filename = osp.normcase(osp.dirname(osp.abspath(__file__)))
     return osp.realpath(filename)
 
 
+@pytest.mark.skipif(
+    sys.platform in ("emscripten",),
+    reason="Pyodide does not support processes",
+)
 def test_returncode():
     assert subprocess.run(["mathics", "-e", "Quit[5]"]).returncode == 5
     assert subprocess.run(["mathics", "-e", "1 + 2'"]).returncode == 0