add pyscript python file with python convenience code

pyscriptjs/src/pyscript.py

@@ -0,0 +1,90 @@
+from js import document, setInterval, console
+import asyncio
+import io, base64
+
+loop = asyncio.get_event_loop()
+
+class PyScript:
+    loop = loop
+
+    @staticmethod
+    def write(element_id, value, append=False, exec_id=0):
+        """Writes value to the element with id "element_id"""
+        console.log(f"APPENDING: {append} ==> {element_id} --> {value}")
+        if append:
+            child = document.createElement('div');
+            element = document.querySelector(f'#{element_id}');
+            exec_id = exec_id or element.childElementCount + 1
+            element_id = child.id = f"{element_id}-{exec_id}";
+            element.appendChild(child);
+
+        if hasattr(value, "savefig"):
+            console.log(f"FIGURE: {value}")
+            buf = io.BytesIO()
+            value.savefig(buf, format='png')
+            buf.seek(0)
+            img_str = 'data:image/png;base64,' + base64.b64encode(buf.read()).decode('UTF-8')
+            document.getElementById(element_id).innerHTML = f'<div><img id="plt" src="{img_str}"/></div>'
+        elif hasattr(value, "startswith") and value.startswith("data:image"):
+            console.log(f"DATA/IMAGE: {value}")
+            document.getElementById(element_id).innerHTML = f'<div><img id="plt" src="{value}"/></div>'
+        else:
+            document.getElementById(element_id).innerHTML = repr(value);
+            console.log(f"ELSE: {append} ==> {element_id} --> {value}")
+
+    @staticmethod
+    def run_until_complete(f):
+        p = loop.run_until_complete(f)
+
+
+class Element:
+    def __init__(self, element_id, element=None):
+        self._id = element_id
+        self._element = element
+
+    @property
+    def element(self):
+        """Return the dom element"""
+        if not self._element:
+            self._element = document.querySelector(f'#{self._id}');
+        return self._element
+
+    def write(self, value, append=False):
+        console.log(f"Element.write: {value} --> {append}")
+        # TODO: it should be the opposite... pyscript.write should use the Element.write
+        #       so we can consolidate on how we write depending on the element type
+        pyscript.write(self._id, value, append=append)
+
+    def clear(self):
+        if hasattr(self.element, 'value'):
+            self.element.value = ''
+        else:
+            self.write("", append=False)
+
+    def select(self, query, from_content=False):
+        el = self.element
+        if from_content:
+            el = el.content
+
+        _el = el.querySelector(query)
+        if _el:
+            return Element(_el.id, _el)
+        else:
+            console.log(f"WARNING: can't find element matching query {query}")
+
+    def clone(self, new_id=None, to=None):
+        if new_id is None:
+            new_id = self.element.id
+
+        clone = self.element.cloneNode(True);
+        clone.id = new_id;
+
+        if to:
+            to.element.appendChild(clone)
+
+        # Inject it into the DOM
+        self.element.after(clone);
+        
+        return Element(clone.id, clone)
+
+pyscript = PyScript()