Move all script generation to backend

src/sage/plot/plot3d/base.pyx

@@ -356,7 +356,7 @@ cdef class Graphics3d(SageObject):
 
         EXAMPLES::
 
-            sage: sphere()._rich_repr_threejs()
+            sage: sphere(online=True)._rich_repr_threejs()
             OutputSceneThreejs container
         """
         options = {}
@@ -372,19 +372,7 @@ cdef class Graphics3d(SageObject):
 
         from sage.repl.rich_output import get_display_manager
         backend = get_display_manager()._backend
-        from sage.repl.rich_output.backend_sagenb import BackendSageNB
-        if isinstance(backend, BackendSageNB):
-            options['online'] = True
-
-        if options['online']:
-            from sage.misc.package import installed_packages
-            version = installed_packages()['threejs']
-            scripts = """
-<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/build/three.min.js"></script>
-<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/examples/js/controls/OrbitControls.js"></script>
-            """.format(version)
-        else:
-            scripts = backend.threejs_offline_scripts()
+        scripts = backend.threejs_scripts(options['online'])
 
         b = self.bounding_box()
         bounds = '[{{"x":{}, "y":{}, "z":{}}}, {{"x":{}, "y":{}, "z":{}}}]'.format(

src/sage/repl/rich_output/backend_base.py

@@ -1,9 +1,9 @@
 # -*- encoding: utf-8 -*-
 r"""
-Base class for Backends
+Base Class for Backends
 
 The display backends are the commandline, the SageNB notebook, the
-ipython notebook, the Emacs sage mode, the Sage doctester, .... All of
+IPython notebook, the Emacs sage mode, the Sage doctester, .... All of
 these have different capabilities for what they can display.
 
 To implement a new display backend, you need to subclass
@@ -594,6 +594,35 @@ def display_immediately(self, plain_text, rich_output):
         """
         raise NotImplementedError('derived classes must implement this method')
 
+    def threejs_scripts(self, online):
+        """
+        Three.js scripts for the backend base
+
+        INPUT:
+
+        - ``online`` -- Boolean determining script usage context
+
+        OUTPUT:
+
+        String containing script tags
+
+        EXAMPLES::
+
+            sage: from sage.repl.rich_output.backend_base import BackendBase
+            sage: backend = BackendBase()
+            sage: backend.threejs_scripts(True)
+            '...<script ...</script>...'
+        """
+        if online:
+            from sage.misc.package import installed_packages
+            version = installed_packages()['threejs']
+            return """
+<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/build/three.min.js"></script>
+<script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/examples/js/controls/OrbitControls.js"></script>
+            """.format(version)
+        else:
+            raise ValueError('online should be true for the backend base')
+
 
 class BackendSimple(BackendBase):
     """

src/sage/repl/rich_output/backend_ipython.py

@@ -396,22 +396,33 @@ def is_in_terminal(self):
         """
         return True
 
-    def threejs_offline_scripts(self):
+    def threejs_scripts(self, online):
         """
-        Three.js offline scripts for the IPython command line
+        Three.js scripts for the IPython command line
+
+        INPUT:
+
+        - ``online`` -- Boolean determining script usage context
+
+        OUTPUT:
+
+        String containing script tags
 
         EXAMPLES::
 
             sage: from sage.repl.rich_output.backend_ipython import BackendIPythonCommandline
             sage: backend = BackendIPythonCommandline()
-            sage: backend.threejs_offline_scripts()
+            sage: backend.threejs_scripts(True)
             '...<script ...</script>...'
         """
-        from sage.env import SAGE_SHARE
-        return """
+        if online:
+            return super(BackendIPythonCommandline, self).threejs_scripts(online)
+        else:
+            from sage.env import SAGE_SHARE
+            return """
 <script src="{0}/threejs/three.min.js"></script>
 <script src="{0}/threejs/OrbitControls.js"></script>
-        """.format(SAGE_SHARE)
+            """.format(SAGE_SHARE)
 
 
 
@@ -572,25 +583,36 @@ def displayhook(self, plain_text, rich_output):
         else:
             raise TypeError('rich_output type not supported')
 
-    def threejs_offline_scripts(self):
+    def threejs_scripts(self, online):
         """
-        Three.js offline scripts for the IPython notebook
+        Three.js scripts for the IPython notebook
+
+        INPUT:
+
+        - ``online`` -- Boolean determining script usage context
+
+        OUTPUT:
+
+        String containing script tags
 
         EXAMPLES::
 
             sage: from sage.repl.rich_output.backend_ipython import BackendIPythonNotebook
             sage: backend = BackendIPythonNotebook()
-            sage: backend.threejs_offline_scripts()
+            sage: backend.threejs_scripts(True)
             '...<script ...</script>...'
         """
-        from sage.misc.package import installed_packages
-        version = installed_packages()['threejs']
-        return """
+        if online:
+            return super(BackendIPythonNotebook, self).threejs_scripts(online)
+        else:
+            from sage.misc.package import installed_packages
+            version = installed_packages()['threejs']
+            return """
 <script src="/nbextensions/threejs/three.min.js"></script>
 <script src="/nbextensions/threejs/OrbitControls.js"></script>
 <script>
   if ( !window.THREE ) document.write('\
 <script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/build/three.min.js"><\/script>\
 <script src="https://cdn.rawgit.com/mrdoob/three.js/{0}/examples/js/controls/OrbitControls.js"><\/script>');
 </script>
-        """.format(version)
+            """.format(version)

src/sage/repl/rich_output/backend_sagenb.py

@@ -452,3 +452,27 @@ def embed_video(self, video_output):
             url='cell://' + filename,
             link_attrs='class="file_link"',
         ))
+
+    def threejs_scripts(self, online):
+        """
+        Three.js scripts for the Sage notebook
+
+        INPUT:
+
+        - ``online`` -- Boolean determining script usage context
+
+        OUTPUT:
+
+        String containing script tags
+
+        EXAMPLES::
+
+            sage: from sage.repl.rich_output.backend_sagenb import BackendSageNB
+            sage: backend = BackendSageNB()
+            sage: backend.threejs_scripts(True)
+            '...<script ...</script>...'
+        """
+        if online:
+            return super(BackendSageNB, self).threejs_scripts(online)
+        else:
+            return super(BackendSageNB, self).threejs_scripts(True)