[pypy-svn] r38850 - pypy/dist/pypy/translator/js/examples

Wed Feb 14 16:57:38 CET 2007

Author: guido
Date: Wed Feb 14 16:57:37 2007
New Revision: 38850

Added:
   pypy/dist/pypy/translator/js/examples/guestbook.py
   pypy/dist/pypy/translator/js/examples/guestbook_client.py
Log:
Stupid guestbook example for the 'webapps_with_pypy.txt' doc.


Added: pypy/dist/pypy/translator/js/examples/guestbook.py
==============================================================================

--- (empty file)
+++ pypy/dist/pypy/translator/js/examples/guestbook.py	Wed Feb 14 16:57:37 2007
@@ -0,0 +1,95 @@
+#!/usr/bin/env python
+
+""" the mandatory guestbook example
+
+    accompanies the pypyp/doc/js/webapps_with_pypy.txt document, serves as
+    a simple example to show how to go about writing a pypy web application
+"""
+
+import autopath
+
+from pypy.translator.js.lib import server
+from pypy.translator.js.lib.support import callback
+from pypy.translator.js.main import rpython2javascript
+
+import py
+import shelve
+
+class ExportedMethods(server.ExportedMethods):
+    """ this provides the methods that are exposed to the client ('AJAX' stuff)
+    """
+    def __init__(self):
+        super(ExportedMethods, self).__init__()
+        self._db = shelve.open('messages')
+        self._db.setdefault('messages', [])
+
+    # callback makes that a method gets exposed, it can get 2 arguments,
+    # 'ret' for specifying the return value, and 'args' for specifying the
+    # argument types
+    @callback(retval=[str])
+    def get_messages(self):
+        return self._db['messages']
+
+    @callback(retval=str)
+    def add_message(self, name='', message=''):
+        text = '%s says: %s' % (name, message)
+        m = self._db['messages']
+        m.append(text)
+        self._db['messages'] = m
+        return text
+
+exported_methods = ExportedMethods()
+
+FUNCTION_LIST = ['init_guestbook', 'add_message']
+def guestbook_client():
+    """ compile the rpython guestbook_client code to js
+    """
+    import guestbook_client
+    return rpython2javascript(guestbook_client, FUNCTION_LIST)
+
+class Handler(server.Handler):
+    """ a BaseHTTPRequestHandler subclass providing the HTTP methods
+    """
+    # provide the exported methods
+    exported_methods = exported_methods
+
+    # a simple html page
+    def index(self):
+        html = """
+            <html>
+              <head>
+                <title>Guestbook</title>
+                <script type="text/javascript" src="/guestbook.js"></script>
+              </head>
+              <body onload="init_guestbook()">
+                <h2>Guestbook</h2>
+                <div id="messages">
+                  <!-- this will be filled from javascript -->
+                </div>
+                <form action="." method="post"
+                      onsubmit="add_message(this); return false">
+                  name: <input type="text" name="name" id="name" /><br />
+                  message:<br />
+                  <textarea name="message" id="message"></textarea><br />
+                  <input type="submit" />
+                </form>
+              </body>
+            </html>
+        """
+        return 'text/html', html
+    index.exposed = True
+
+    # the (generated) javascript
+    def guestbook_js(self):
+        if hasattr(self.server, 'source'):
+            source = self.server.source
+        else:
+            source = guestbook_client()
+            self.server.source = source
+        return "text/javascript", source
+    guestbook_js.exposed = True
+
+if __name__ == '__main__':
+    addr = ('', 8008)
+    httpd = server.create_server(server_address=addr, handler=Handler)
+    httpd.serve_forever()

Added: pypy/dist/pypy/translator/js/examples/guestbook_client.py
==============================================================================
--- (empty file)
+++ pypy/dist/pypy/translator/js/examples/guestbook_client.py	Wed Feb 14 16:57:37 2007
@@ -0,0 +1,35 @@
+""" rpython guestbook client-side code
+
+    this code can be tested in CPython, but will also be converted to
+    JavaScript to provide the client-side functionality for the guestbook
+    example
+"""
+
+from pypy.translator.js.modules import dom
+from pypy.translator.js.examples.guestbook import exported_methods
+
+def add_html_message(text=''):
+    doc = dom.window.document
+    div = doc.getElementById('messages')
+    msgdiv = doc.createElement('div')
+    msgdiv.style.border = '1px solid black'
+    msgdiv.style.margin = '1em'
+    msgdiv.appendChild(doc.createTextNode(text))
+    div.appendChild(msgdiv)
+
+def _init_callback(messages):
+    for message in messages:
+        add_html_message(message)
+
+def init_guestbook():
+    exported_methods.get_messages(_init_callback)
+
+def _add_message_callback(message):
+    add_html_message(message)
+
+def add_message():
+    doc = dom.window.document
+    name = doc.getElementById('name').value
+    message = doc.getElementById('message').value
+    exported_methods.add_message(name, message, _add_message_callback)
+

