Rewrite generate-bindings.pl in Python

Source/bindings/scripts/semantic_analyzer.py

Index: Source/bindings/scripts/semantic_analyzer.py
diff --git a/Source/bindings/scripts/semantic_analyzer.py b/Source/bindings/scripts/semantic_analyzer.py
new file mode 100755
index 0000000000000000000000000000000000000000..e05b7f6b5e452da5c55494ae446d8be7579e1887
--- /dev/null
+++ b/Source/bindings/scripts/semantic_analyzer.py
@@ -0,0 +1,97 @@
+# 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.
+
+import os.path
+
+
+class AttributeFileFormatError(Exception):
+    pass
+
+
+class InvalidIDLAttributeError(Exception):
+    pass
+
+
+def read_idl_file(idl_attributes_filename):
+    idl_attributes = {}
+    with open(idl_attributes_filename) as idl_attributes_file:
+        for line in idl_attributes_file:
+            line = line.strip()
+            if not line or line.startswith('#'):
+                continue
+            name, _, values_string = map(str.strip, line.partition('='))
+            if not name:
+                raise AttributeFileFormatError('The format of %s is wrong, in line "%s"' % os.path.basename(idl_attributes_filename), line)
+            idl_attributes[name] = set()
+            value_list = values_string.split('|')
+            if not value_list:
+                idl_attributes[name].add(None)
+                continue
+            for value in value_list:
+                value = value.strip()
+                if not value:
+                    value = None
+                idl_attributes[name].add(value)
+    return idl_attributes
+
+
+class IDLAttributeChecker():
+    def __init__(self, idl_attributes_filename):
+        self.idl_attributes = read_idl_file(idl_attributes_filename)
+
+    def validate_name_value_string(self, name, values_string):
+        if name not in self.idl_attributes:
+            raise InvalidIDLAttributeError('Unknown IDL attribute [%s]' % name)
+        valid_values = self.idl_attributes[name]
+        if '*' in valid_values:  # wildcard, any value ok
+            return
+        value_list = values_string.strip.split('|')
+        for value in value_list:
+            if value not in valid_values:
+                raise InvalidIDLAttributeError('Invalid IDL value {value} found in attribute [{name}={value_string}]'.format(**locals))
+
+    def validate_extended_attributes(self, node):
+        for name, value_string in node['extendedAttributes'].iteritems():
+            self.validate_name_value_string(name, value_string)
+
+    def check_idl_attributes(self, document, idl_filename):
+        # FIXME: this should be done when parsing the tree, rather than after
+        try:
+            for interface in document['interfaces']:
+                self.validate_extended_attributes(interface)
+                for attribute in interface['attributes']:
+                    self.validate_extended_attributes(attribute['signature'])
+                for function in interface['functions']:
+                    self.validate_extended_attributes(function['signature'])
+                    for parameter in function['parameters']:
+                        self.validate_extended_attributes(parameter)
+        except InvalidIDLAttributeError, error:
+            raise InvalidIDLAttributeError("""IDL ATTRIBUTE ERROR in file %s:
+%s
+If you want to add a new IDL attribute, please add it to bindings/scripts/IDLAttributes.txt and add an explanation to the Blink IDL document at http://chromium.org/blink/webidl
+""" % idl_filename, error.value)