Add Python flow to bindings generation, move dummy-generating IDL files over

Source/bindings/scripts/idl_reader.py

+# Copyright (C) 2013 Google Inc. All rights reserved.
+#
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+# modification, are permitted provided that the following conditions are
+# met:
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+
+"""Read an IDL file or complete IDL interface, producing an IdlDefinitions object.
+
+FIXME: Currently a stub, as part of landing the parser incrementally.
+Just create dummy IdlDefinitions objects (no parsing or object building done),
+and resolve dependencies.
+The interface reader should always return None, indicating that bindings should
+not be generated, since the code generator has also not landed yet.
+"""
+
+import os.path
+
+import interface_dependency_resolver
+
+
+class IdlDefinitions():

[haraken, 2013/07/10 07:13:46]

Your comment makes sense. IdlDefinitions sounds better.

+    """Top-level IDL class.
+
+    In Web IDL spec terms, represents a set of definitions, obtained by parsing
+    a set of IDL fragments (i.e., the contents of .idl files).
+    See: http://www.w3.org/TR/WebIDL/#idl
+    """
+    # FIXME: Dummy class; full class hierarchy will be added with parser
+    pass
+
+
+def read_idl_interface(idl_filename, interface_dependencies_filename, additional_idl_filenames):

[haraken, 2013/07/10 07:13:46]

You might want to rename it to read_idl_definitions.

[Nils Barth (inactive), 2013/07/10 07:35:36]

Good point, done.

+    """Returns an IdlDefinitions object for an IDL interface, including all dependencies."""

[haraken, 2013/07/10 07:13:46]

for an IDL interface => for a given IDL file

As I commented before, we've been confused with concepts of IDL interfaces, IDL
definitions and IDL files (e.g. we should list not IDL files but IDL interfaces
in InterfaceDependencies.txt). Let's clean up all of these confusions in a
follow-up CL.

[Nils Barth (inactive), 2013/07/10 07:35:36]

Done.
Yeah, there's a lot of confusion, old hacks, and cruft.
Will fix!

+    basename = os.path.basename(idl_filename)
+
+    idl_definitions = read_idl_file(idl_filename)
+    should_generate_bindings = interface_dependency_resolver.merge_interface_dependencies(idl_definitions, idl_filename, interface_dependencies_filename, additional_idl_filenames)
+    if not should_generate_bindings:
+        return None
+    # FIXME: turn on validator
+    # idl_validator.validate_extended_attributes(idl_definitions, basename, options.idl_attributes_file)
+    return idl_definitions
+
+
+def read_idl_file(idl_filename, verbose=False):
+    """Returns an IdlDefinitions object for an IDL file, without any dependencies."""
+    # FIXME: Currently returns dummy object, as parser not present yet.
+    # parser = BlinkIDLParser(verbose=verbose)
+    # file_node = blink_idl_parser.parse_file(parser, idl_filename)
+    # return idl_object_builder.file_node_to_idl_definitions(file_node)
+    return IdlDefinitions()