[MNT] readwrite: Replace use of deprecated ast classes

.github/workflows/run-docs-build.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         include:
           - os: ubuntu-20.04
-            python: 3.7
+            python: "3.8"
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/run-tests-workflow.yml

@@ -21,10 +21,6 @@ jobs:
             python-version: 3.8
             test-env: "PyQt5~=5.12.0"
 
-          - os: ubuntu-20.04
-            python-version: 3.7
-            test-env: "PyQt5~=5.15.0"
-
           - os: ubuntu-20.04
             python-version: 3.8
             test-env: "PyQt5~=5.15.0"
@@ -56,31 +52,31 @@ jobs:
             extra-system-packages: "glibc-tools"
 
           # macOS
-          - os: macos-11
+          - os: macos-12
             python-version: 3.8
             test-env: "PyQt5~=5.12.0"
 
-          - os: macos-11
+          - os: macos-12
             python-version: 3.9
             test-env: "PyQt5~=5.14.0"
 
-          - os: macos-11
+          - os: macos-12
             python-version: "3.10"
             test-env: "PyQt5~=5.15.0"
 
-          - os: macos-12
+          - os: macos-13
             python-version: "3.11"
             test-env: "PyQt5~=5.15.0"
 
-          - os: macos-12
+          - os: macos-14
             python-version: "3.11"
             test-env: "PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3"
 
-          - os: macos-12
+          - os: macos-latest
             python-version: "3.11"
             test-env: "PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0"
 
-          - os: macos-12
+          - os: macos-latest
             python-version: "3.12"
             test-env: "PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0"
 

.readthedocs.yml

@@ -3,7 +3,7 @@ version: 2
 build:
   os: ubuntu-22.04
   tools:
-    python: "3.7"
+    python: "3.8"
 
 python:
    install:

docs/requirements-rtd.txt

@@ -3,7 +3,7 @@
 setuptools
 sphinx~=4.2.0
 sphinx-rtd-theme
-PyQt5~=5.9.2
+PyQt5
 AnyQt
 
 # sphinx pins docutils version, but the installation in the RTD worker/config

orangecanvas/scheme/readwrite.py

@@ -3,9 +3,6 @@
 
 """
 import numbers
-import sys
-import types
-import warnings
 import base64
 import binascii
 import itertools
@@ -14,7 +11,7 @@
 from xml.etree.ElementTree import TreeBuilder, Element, ElementTree, parse
 
 from collections import defaultdict
-from itertools import chain, count
+from itertools import chain
 
 import pickle
 import json
@@ -29,6 +26,8 @@
     NamedTuple, Dict, Tuple, List, Union, Any, Optional, AnyStr, IO
 )
 
+from typing_extensions import TypeGuard
+
 from . import SchemeNode, SchemeLink
 from .annotations import SchemeTextAnnotation, SchemeArrowAnnotation
 from .errors import IncompatibleChannelTypeError
@@ -65,9 +64,10 @@ def string_eval(source):
 
     """
     node = _ast_parse_expr(source)
-    if not isinstance(node.body, ast.Str):
+    body = node.body
+    if not _is_constant(body, (str,)):
         raise ValueError("%r is not a string literal" % source)
-    return node.body.s
+    return body.value
 
 
 def tuple_eval(source):
@@ -85,11 +85,11 @@ def tuple_eval(source):
     if not isinstance(node.body, ast.Tuple):
         raise ValueError("%r is not a tuple literal" % source)
 
-    if not all(isinstance(el, (ast.Str, ast.Num)) or
+    if not all(_is_constant(el, (str, float, complex, int)) or
                # allow signed number literals in Python3 (i.e. -1|+1|-1.0)
                (isinstance(el, ast.UnaryOp) and
                 isinstance(el.op, (ast.UAdd, ast.USub)) and
-                isinstance(el.operand, ast.Num))
+                _is_constant(el.operand, (float, complex, int)))
                for el in node.body.elts):
         raise ValueError("Can only contain numbers or strings")
 
@@ -112,18 +112,17 @@ def terminal_eval(source):
 
 def _terminal_value(node):
     # type: (ast.AST) -> Union[str, bytes, int, float, complex, None]
-    if isinstance(node, ast.Str):
-        return node.s
-    elif isinstance(node, ast.Bytes):
-        return node.s
-    elif isinstance(node, ast.Num):
-        return node.n
-    elif isinstance(node, ast.NameConstant):
+    if _is_constant(node, (str, bytes, int, float, complex, type(None))):
         return node.value
-
     raise ValueError("Not a terminal")
 
 
+def _is_constant(
+        node: ast.AST, types: Tuple[type, ...]
+) -> TypeGuard[ast.Constant]:
+    return isinstance(node, ast.Constant) and isinstance(node.value, types)
+
+
 # Intermediate scheme representation
 _scheme = NamedTuple(
     "_scheme", [

orangecanvas/scheme/tests/test_readwrite.py

@@ -81,6 +81,9 @@ def test_safe_evals(self):
         s = readwrite.string_eval(r"'\x00\xff'")
         self.assertEqual(s, chr(0) + chr(255))
 
+        with self.assertRaises(ValueError):
+            readwrite.string_eval("3")
+
         with self.assertRaises(ValueError):
             readwrite.string_eval("[1, 2]")
 
@@ -96,10 +99,14 @@ def test_safe_evals(self):
         self.assertIs(readwrite.terminal_eval("True"), True)
         self.assertIs(readwrite.terminal_eval("False"), False)
         self.assertIs(readwrite.terminal_eval("None"), None)
-
         self.assertEqual(readwrite.terminal_eval("42"), 42)
+        self.assertEqual(readwrite.terminal_eval("42."), 42.)
         self.assertEqual(readwrite.terminal_eval("'42'"), '42')
         self.assertEqual(readwrite.terminal_eval(r"b'\xff\x00'"), b'\xff\x00')
+        with self.assertRaises(ValueError):
+            readwrite.terminal_eval("...")
+        with self.assertRaises(ValueError):
+            readwrite.terminal_eval("{}")
 
     def test_literal_dump(self):
         struct = {1: [{(1, 2): ""}],

setup.py

@@ -32,6 +32,7 @@
     "qasync>=0.10.0",
     "importlib_metadata; python_version<'3.10'",
     "importlib_resources; python_version<'3.9'",
+    "typing_extensions",
     "packaging",
     "numpy",
 )
@@ -59,7 +60,7 @@
     "Documentation": "https://orange-canvas-core.readthedocs.io/en/latest/",
 }
 
-PYTHON_REQUIRES = ">=3.6"
+PYTHON_REQUIRES = ">=3.8"
 
 if __name__ == "__main__":
     setup(