Merge pull request #146 from Distributive-Network/feature/pm-new-bug-144

A pm.new and other helpers

Author: zollqir

python/pythonmonkey/__init__.py

@@ -1,5 +1,6 @@
 # Export public PythonMonkey APIs
 from .pythonmonkey import *
+from .helpers import *
 from .require import *
 
 # Expose the package version
@@ -24,4 +25,4 @@
   Object.defineProperty(Object.prototype, "keys", keysMethod)
   Object.defineProperty(Array.prototype, "keys", keysMethod)
 }
-""")(lambda *args: list(args))
+""", { 'filename': __file__, 'fromPythonFrame': True })(lambda *args: list(args))

python/pythonmonkey/helpers.py

@@ -0,0 +1,58 @@
+# @file         helpers.py - Python->JS helpers for PythonMonkey
+#               - typeof operator wrapper
+#               - new operator wrapper
+#
+# @author       Wes Garland, [email protected]
+# @date         July 2023
+#
+
+from . import pythonmonkey as pm 
+evalOpts = { 'filename': __file__, 'fromPythonFrame': True }
+
+def typeof(jsval):
+    """
+    typeof function - wraps JS typeof operator
+    """
+    return pm.eval("""'use strict'; (
+function pmTypeof(jsval) 
+{
+  return typeof jsval;
+}
+    )""", evalOpts)(jsval);
+
+def new(ctor):
+    """
+    new function - emits function which wraps JS new operator, emitting a lambda which constructs a new
+    JS object upon invocation.
+    """
+    if (typeof(ctor) == 'string'):
+        ctor = pm.eval(ctor)
+
+    newCtor = pm.eval("""'use strict'; (
+function pmNewFactory(ctor)
+{
+  return function newCtor(args) {
+    args = Array.from(args || []);
+    return new ctor(...args);
+  };
+}
+    )""", evalOpts)(ctor)
+    return (lambda *args: newCtor(list(args)))
+
+# List which symbols are exposed to the pythonmonkey module.
+__all__ = [ "new", "typeof" ]
+
+# Add the non-enumerable properties of globalThis which don't collide with pythonmonkey.so as exports:
+globalThis = pm.eval('globalThis');
+pmGlobals = vars(pm)
+
+exports = pm.eval("""
+Object.getOwnPropertyNames(globalThis)
+.filter(prop => Object.keys(globalThis).indexOf(prop) === -1);
+""", evalOpts)
+
+for index in range(0, int(exports.length)):
+    name = exports[index]
+    if (pmGlobals.get(name) == None):
+        globals().update({name: globalThis[name]})
+        __all__.append(name)

python/pythonmonkey/require.py

@@ -352,5 +352,5 @@ def require(moduleIdentifier: str):
       filename = os.path.join(os.getcwd(), "__main__") # use the CWD instead
     return createRequire(filename)(moduleIdentifier)
 
-# Restrict what are exposed to the pythonmonkey module.
+# Restrict what symbols are exposed to the pythonmonkey module.
 __all__ = ["globalThis", "require", "createRequire", "runProgramModule"]