Roll IDL to Dartium37 (r181268)

bindings/scripts/compute_global_objects.py

Index: bindings/scripts/compute_global_objects.py
diff --git a/bindings/scripts/compute_global_objects.py b/bindings/scripts/compute_global_objects.py
new file mode 100755
index 0000000000000000000000000000000000000000..93d2eed5db3d4e7f505fc2bf722938a395152fcd
--- /dev/null
+++ b/bindings/scripts/compute_global_objects.py
@@ -0,0 +1,113 @@
+#!/usr/bin/python
+#
+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Compute global objects.
+
+Global objects are defined by interfaces with [Global] or [PrimaryGlobal] on
+their definition: http://heycam.github.io/webidl/#Global
+
+Design document: http://www.chromium.org/developers/design-documents/idl-build
+"""
+
+import optparse
+import os
+import cPickle as pickle
+import sys
+
+from utilities import get_file_contents, idl_filename_to_interface_name, get_interface_extended_attributes_from_idl, read_file_to_list, read_pickle_files, write_pickle_file
+
+GLOBAL_EXTENDED_ATTRIBUTES = frozenset([
+    'Global',
+    'PrimaryGlobal',
+])
+
+
+def parse_options():
+    usage = 'Usage: %prog [options] [GlobalObjectsComponent.pickle]... [GlobalObjects.pickle]'
+    parser = optparse.OptionParser(usage=usage)
+    parser.add_option('--idl-files-list', help='file listing IDL files')
+    parser.add_option('--write-file-only-if-changed', type='int', help='if true, do not write an output file if it would be identical to the existing one, which avoids unnecessary rebuilds in ninja')
+
+    options, args = parser.parse_args()
+
+    if options.idl_files_list is None:
+        parser.error('Must specify a file listing IDL files using --idl-files-list.')
+    if options.write_file_only_if_changed is None:
+        parser.error('Must specify whether output files are only written if changed using --write-file-only-if-changed.')
+    options.write_file_only_if_changed = bool(options.write_file_only_if_changed)
+    if not args:
+        parser.error('Must specify an output pickle filename as argument, '
+                     'optionally preceeded by input pickle filenames.')
+
+    return options, args
+
+
+def dict_union(dicts):
+    return dict((k, v) for d in dicts for k, v in d.iteritems())
+
+
+def idl_file_to_global_names(idl_filename):
+    """Returns global names, if any, for an IDL file.
+
+    If the [Global] or [PrimaryGlobal] extended attribute is declared with an
+    identifier list argument, then those identifiers are the interface's global
+    names; otherwise, the interface has a single global name, which is the
+    interface's identifier (http://heycam.github.io/webidl/#Global).
+    """
+    interface_name = idl_filename_to_interface_name(idl_filename)
+    full_path = os.path.realpath(idl_filename)
+    idl_file_contents = get_file_contents(full_path)
+    extended_attributes = get_interface_extended_attributes_from_idl(idl_file_contents)
+
+    global_keys = GLOBAL_EXTENDED_ATTRIBUTES.intersection(
+        extended_attributes.iterkeys())
+    if not global_keys:
+        return
+    if len(global_keys) > 1:
+        raise ValueError('The [Global] and [PrimaryGlobal] extended attributes '
+                         'MUST NOT be declared on the same interface.')
+    global_key = next(iter(global_keys))
+
+    global_value = extended_attributes[global_key]
+    if global_value:
+        # FIXME: In spec names are comma-separated, which makes parsing very
+        # difficult (https://www.w3.org/Bugs/Public/show_bug.cgi?id=24959).
+        return global_value.split('&')
+    return [interface_name]
+
+
+def idl_files_to_interface_name_global_names(idl_files):
+    """Yields pairs (interface_name, global_names) found in IDL files."""
+    for idl_filename in idl_files:
+        interface_name = idl_filename_to_interface_name(idl_filename)
+        global_names = idl_file_to_global_names(idl_filename)
+        if global_names:
+            yield interface_name, global_names
+
+
+################################################################################
+
+def main():
+    options, args = parse_options()
+    # args = Input1, Input2, ..., Output
+    output_global_objects_filename = args.pop()
+    interface_name_global_names = dict_union(
+        existing_interface_name_global_names
+        for existing_interface_name_global_names in read_pickle_files(args))
+
+    # Input IDL files are passed in a file, due to OS command line length
+    # limits. This is generated at GYP time, which is ok b/c files are static.
+    idl_files = read_file_to_list(options.idl_files_list)
+    interface_name_global_names.update(
+            idl_files_to_interface_name_global_names(idl_files))
+
+    write_pickle_file(output_global_objects_filename,
+                      interface_name_global_names,
+                      options.write_file_only_if_changed)
+
+
+if __name__ == '__main__':
+    sys.exit(main())