Roll IDL to Dartium37 (r181268)

bindings/scripts/idl_validator.py

Index: bindings/scripts/idl_validator.py
diff --git a/bindings/scripts/idl_validator.py b/bindings/scripts/idl_validator.py
new file mode 100644
index 0000000000000000000000000000000000000000..e527442cab787ec239c286985442b56a2a3035c4
--- /dev/null
+++ b/bindings/scripts/idl_validator.py
@@ -0,0 +1,108 @@
+# Copyright (C) 2013 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Validate extended attributes.
+
+Design doc: http://www.chromium.org/developers/design-documents/idl-compiler#TOC-Extended-attribute-validation
+"""
+
+
+import os.path
+import re
+
+module_path = os.path.dirname(__file__)
+source_path = os.path.join(module_path, os.pardir, os.pardir)
+EXTENDED_ATTRIBUTES_RELATIVE_PATH = os.path.join('bindings',
+                                                 'IDLExtendedAttributes.txt')
+EXTENDED_ATTRIBUTES_FILENAME = os.path.join(source_path,
+                                            EXTENDED_ATTRIBUTES_RELATIVE_PATH)
+
+class IDLInvalidExtendedAttributeError(Exception):
+    pass
+
+
+class IDLExtendedAttributeValidator(object):
+    def __init__(self):
+        self.valid_extended_attributes = read_extended_attributes_file()
+
+    def validate_extended_attributes(self, definitions):
+        # FIXME: this should be done when parsing the file, rather than after.
+        for interface in definitions.interfaces.itervalues():
+            self.validate_extended_attributes_node(interface)
+            for attribute in interface.attributes:
+                self.validate_extended_attributes_node(attribute)
+            for operation in interface.operations:
+                self.validate_extended_attributes_node(operation)
+                for argument in operation.arguments:
+                    self.validate_extended_attributes_node(argument)
+
+    def validate_extended_attributes_node(self, node):
+        for name, values_string in node.extended_attributes.iteritems():
+            self.validate_name_values_string(name, values_string)
+
+    def validate_name_values_string(self, name, values_string):
+        if name not in self.valid_extended_attributes:
+            raise IDLInvalidExtendedAttributeError(
+                'Unknown extended attribute [%s]' % name)
+        valid_values = self.valid_extended_attributes[name]
+        if values_string is None and None not in valid_values:
+            raise IDLInvalidExtendedAttributeError(
+                'Missing required argument for extended attribute [%s]' % name)
+        if '*' in valid_values:  # wildcard, any (non-empty) value ok
+            return
+        if values_string is None:
+            values = set([None])
+        else:
+            values = set(re.split('[|&]', values_string))
+        invalid_values = values - valid_values
+        if invalid_values:
+            invalid_value = invalid_values.pop()
+            raise IDLInvalidExtendedAttributeError(
+                'Invalid value "%s" found in extended attribute [%s=%s]' %
+                (invalid_value, name, values_string))
+
+
+def read_extended_attributes_file():
+    def extended_attribute_name_values():
+        with open(EXTENDED_ATTRIBUTES_FILENAME) as extended_attributes_file:
+            for line in extended_attributes_file:
+                line = line.strip()
+                if not line or line.startswith('#'):
+                    continue
+                name, _, values_string = map(str.strip, line.partition('='))
+                value_list = [value.strip() for value in values_string.split('|')]
+                yield name, value_list
+
+    valid_extended_attributes = {}
+    for name, value_list in extended_attribute_name_values():
+        if not value_list:
+            valid_extended_attributes[name] = set([None])
+            continue
+        valid_extended_attributes[name] = set([value if value else None
+                                               for value in value_list])
+    return valid_extended_attributes