gh-114099: Additions to standard library to support iOS (GH-117052)

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>
Co-authored-by: Malcolm Smith <smith@chaquo.com>
Co-authored-by: Ned Deily <nad@python.org>

1 files changed, 46 insertions, 7 deletions

diff --git a/Lib/platform.py b/Lib/platform.py
index df1d987..dbcb636 100755
--- a/Lib/platform.py
+++ b/Lib/platform.py
@@ -496,6 +496,30 @@ def mac_ver(release='', versioninfo=('', '', ''), machine=''):
     # If that also doesn't work return the default values
     return release, versioninfo, machine
 
+
+# A namedtuple for iOS version information.
+IOSVersionInfo = collections.namedtuple(
+    "IOSVersionInfo",
+    ["system", "release", "model", "is_simulator"]
+)
+
+
+def ios_ver(system="", release="", model="", is_simulator=False):
+    """Get iOS version information, and return it as a namedtuple:
+        (system, release, model, is_simulator).
+
+    If values can't be determined, they are set to values provided as
+    parameters.
+    """
+    if sys.platform == "ios":
+        import _ios_support
+        result = _ios_support.get_platform_ios()
+        if result is not None:
+            return IOSVersionInfo(*result)
+
+    return IOSVersionInfo(system, release, model, is_simulator)
+
+
 def _java_getprop(name, default):
     """This private helper is deprecated in 3.13 and will be removed in 3.15"""
     from java.lang import System
@@ -654,7 +678,7 @@ def _platform(*args):
         if cleaned == platform:
             break
         platform = cleaned
-    while platform[-1] == '-':
+    while platform and platform[-1] == '-':
         platform = platform[:-1]
 
     return platform
@@ -695,7 +719,7 @@ def _syscmd_file(target, default=''):
         default in case the command should fail.
 
     """
-    if sys.platform in ('dos', 'win32', 'win16'):
+    if sys.platform in {'dos', 'win32', 'win16', 'ios', 'tvos', 'watchos'}:
         # XXX Others too ?
         return default
 
@@ -859,6 +883,14 @@ class _Processor:
             csid, cpu_number = vms_lib.getsyi('SYI$_CPU', 0)
             return 'Alpha' if cpu_number >= 128 else 'VAX'
 
+    # On the iOS simulator, os.uname returns the architecture as uname.machine.
+    # On device it returns the model name for some reason; but there's only one
+    # CPU architecture for iOS devices, so we know the right answer.
+    def get_ios():
+        if sys.implementation._multiarch.endswith("simulator"):
+            return os.uname().machine
+        return 'arm64'
+
     def from_subprocess():
         """
         Fall back to `uname -p`
@@ -1018,6 +1050,10 @@ def uname():
         system = 'Android'
         release = android_ver().release
 
+    # Normalize responses on iOS
+    if sys.platform == 'ios':
+        system, release, _, _ = ios_ver()
+
     vals = system, node, release, version, machine
     # Replace 'unknown' values with the more portable ''
     _uname_cache = uname_result(*map(_unknown_as_blank, vals))
@@ -1297,11 +1333,14 @@ def platform(aliased=False, terse=False):
         system, release, version = system_alias(system, release, version)
 
     if system == 'Darwin':
-        # macOS (darwin kernel)
-        macos_release = mac_ver()[0]
-        if macos_release:
-            system = 'macOS'
-            release = macos_release
+        # macOS and iOS both report as a "Darwin" kernel
+        if sys.platform == "ios":
+            system, release, _, _ = ios_ver()
+        else:
+            macos_release = mac_ver()[0]
+            if macos_release:
+                system = 'macOS'
+                release = macos_release
 
     if system == 'Windows':
         # MS platforms