Add a new bindings2/scripts directory for Dart bindings

sky/engine/bindings2/scripts/code_generator_dart.py

Index: sky/engine/bindings2/scripts/code_generator_dart.py
diff --git a/sky/engine/bindings2/scripts/code_generator_dart.py b/sky/engine/bindings2/scripts/code_generator_dart.py
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+++ b/sky/engine/bindings2/scripts/code_generator_dart.py
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+# 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.
+
+"""Generate Blink C++ bindings (.h and .cpp files) for use by Dart:HTML.
+
+If run itself, caches Jinja templates (and creates dummy file for build,
+since cache filenames are unpredictable and opaque).
+
+This module is *not* concurrency-safe without care: bytecode caching creates
+a race condition on cache *write* (crashes if one process tries to read a
+partially-written cache). However, if you pre-cache the templates (by running
+the module itself), then you can parallelize compiling individual files, since
+cache *reading* is safe.
+
+Input: An object of class IdlDefinitions, containing an IDL interface X
+Output: DartX.h and DartX.cpp
+
+Design doc: http://www.chromium.org/developers/design-documents/idl-compiler
+"""
+
+import os
+import cPickle as pickle
+import re
+import sys
+import logging
+
+# Path handling for libraries and templates
+# Paths have to be normalized because Jinja uses the exact template path to
+# determine the hash used in the cache filename, and we need a pre-caching step
+# to be concurrency-safe. Use absolute path because __file__ is absolute if
+# module is imported, and relative if executed directly.
+# If paths differ between pre-caching and individual file compilation, the cache
+# is regenerated, which causes a race condition and breaks concurrent build,
+# since some compile processes will try to read the partially written cache.
+module_path, module_filename = os.path.split(os.path.realpath(__file__))
+third_party_dir = os.path.normpath(os.path.join(
+    module_path, os.pardir, os.pardir, os.pardir, os.pardir, os.pardir))
+templates_dir = os.path.normpath(os.path.join(module_path, 'templates'))
+
+# Make sure extension is .py, not .pyc or .pyo, so doesn't depend on caching
+module_pyname = os.path.splitext(module_filename)[0] + '.py'
+
+# jinja2 is in chromium's third_party directory.
+# Insert at 1 so at front to override system libraries, and
+# after path[0] == invoking script dir
+sys.path.insert(1, third_party_dir)
+
+
+import jinja2
+
+import idl_types
+from idl_types import IdlType
+import dart_callback_interface
+import dart_interface
+import dart_types
+from dart_utilities import DartUtilities
+from utilities import write_pickle_file, idl_filename_to_interface_name
+from v8_globals import includes, interfaces
+
+
+class CodeGeneratorDart(object):
+    def __init__(self, interfaces_info, cache_dir):
+        interfaces_info = interfaces_info or {}
+        self.interfaces_info = interfaces_info
+        self.jinja_env = initialize_jinja_env(cache_dir)
+
+        # Set global type info
+        idl_types.set_ancestors(dict(
+            (interface_name, interface_info['ancestors'])
+            for interface_name, interface_info in interfaces_info.iteritems()
+            if interface_info['ancestors']))
+        IdlType.set_callback_interfaces(set(
+            interface_name
+            for interface_name, interface_info in interfaces_info.iteritems()
+            if interface_info['is_callback_interface']))
+        IdlType.set_implemented_as_interfaces(dict(
+            (interface_name, interface_info['implemented_as'])
+            for interface_name, interface_info in interfaces_info.iteritems()
+            if interface_info['implemented_as']))
+        dart_types.set_component_dirs(dict(
+            (interface_name, interface_info['component_dir'])
+            for interface_name, interface_info in interfaces_info.iteritems()))
+
+    def generate_code(self, definitions, interface_name, idl_pickle_filename,
+                      only_if_changed):
+        """Returns .h/.cpp/.dart code as (header_text, cpp_text, dart_text)."""
+        try:
+            interface = definitions.interfaces[interface_name]
+        except KeyError:
+            raise Exception('%s not in IDL definitions' % interface_name)
+
+        # Store other interfaces for introspection
+        interfaces.update(definitions.interfaces)
+
+        # Set local type info
+        IdlType.set_callback_functions(definitions.callback_functions.keys())
+        IdlType.set_enums((enum.name, enum.values)
+                          for enum in definitions.enumerations.values())
+
+        # Select appropriate Jinja template and contents function
+        if interface.is_callback:
+            header_template_filename = 'callback_interface_h.template'
+            cpp_template_filename = 'callback_interface_cpp.template'
+            dart_template_filename = 'callback_interface_dart.template'
+            generate_contents = dart_callback_interface.generate_callback_interface
+        else:
+            header_template_filename = 'interface_h.template'
+            cpp_template_filename = 'interface_cpp.template'
+            dart_template_filename = 'interface_dart.template'
+            generate_contents = dart_interface.interface_context
+        header_template = self.jinja_env.get_template(header_template_filename)
+        cpp_template = self.jinja_env.get_template(cpp_template_filename)
+        dart_template = self.jinja_env.get_template(dart_template_filename)
+
+        # Generate contents (input parameters for Jinja)
+        template_contents = generate_contents(interface)
+        template_contents['code_generator'] = module_pyname
+
+        # Add includes for interface itself and any dependencies
+        interface_info = self.interfaces_info[interface_name]
+        template_contents['header_includes'].add(interface_info['include_path'])
+        template_contents['header_includes'] = sorted(template_contents['header_includes'])
+        includes.update(interface_info.get('dependencies_include_paths', []))
+
+        template_contents['cpp_includes'] = sorted(includes)
+
+        idl_world = {'interface': None, 'callback': None}
+
+        # Load the pickle file for this IDL.
+        if os.path.isfile(idl_pickle_filename):
+            with open(idl_pickle_filename) as idl_pickle_file:
+                idl_global_data = pickle.load(idl_pickle_file)
+                idl_pickle_file.close()
+            idl_world['interface'] = idl_global_data['interface']
+            idl_world['callback'] = idl_global_data['callback']
+
+        if 'interface_name' in template_contents:
+            interface_global = {'component_dir': interface_info['component_dir'],
+                                'name': template_contents['interface_name'],
+                                'parent_interface': template_contents['parent_interface'],
+                                'is_active_dom_object': template_contents['is_active_dom_object'],
+                                'has_resolver': template_contents['interface_name'],
+                                'native_entries': sorted(template_contents['native_entries'], key=lambda(x): x['blink_entry']),
+                               }
+            idl_world['interface'] = interface_global
+        else:
+            callback_global = {'name': template_contents['cpp_class']}
+            idl_world['callback'] = callback_global
+
+        write_pickle_file(idl_pickle_filename,  idl_world, only_if_changed)
+
+        # Render Jinja templates
+        header_text = header_template.render(template_contents)
+        cpp_text = cpp_template.render(template_contents)
+        dart_text = dart_template.render(template_contents)
+        return header_text, cpp_text, dart_text
+
+    def load_global_pickles(self, global_entries):
+        # List of all interfaces and callbacks for global code generation.
+        world = {'interfaces': [], 'callbacks': []}
+
+        # Load all pickled data for each interface.
+        for (directory, file_list) in global_entries:
+            for idl_filename in file_list:
+                interface_name = idl_filename_to_interface_name(idl_filename)
+                idl_pickle_filename = interface_name + "_globals.pickle"
+                idl_pickle_filename = os.path.join(directory, idl_pickle_filename)
+                if not os.path.exists(idl_pickle_filename):
+                    logging.warn("Missing %s" % idl_pickle_filename)
+                    continue
+                with open(idl_pickle_filename) as idl_pickle_file:
+                    idl_world = pickle.load(idl_pickle_file)
+                    if 'interface' in idl_world:
+                        # FIXME: Why are some of these None?
+                        if idl_world['interface']:
+                            world['interfaces'].append(idl_world['interface'])
+                    if 'callback' in idl_world:
+                        # FIXME: Why are some of these None?
+                        if idl_world['callback']:
+                            world['callbacks'].append(idl_world['callback'])
+
+        world['interfaces'] = sorted(world['interfaces'], key=lambda (x): x['name'])
+        world['callbacks'] = sorted(world['callbacks'], key=lambda (x): x['name'])
+        return world
+
+    # Generates global file for all interfaces.
+    def generate_globals(self, global_entries):
+        template_contents = self.load_global_pickles(global_entries)
+        template_contents['code_generator'] = module_pyname
+
+        header_template_filename = 'global_h.template'
+        header_template = self.jinja_env.get_template(header_template_filename)
+        header_text = header_template.render(template_contents)
+
+        cpp_template_filename = 'global_cpp.template'
+        cpp_template = self.jinja_env.get_template(cpp_template_filename)
+        cpp_text = cpp_template.render(template_contents)
+
+        return header_text, cpp_text
+
+    # Generates global dart blink file for all interfaces.
+    def generate_dart_blink(self, global_entries):
+        template_contents = self.load_global_pickles(global_entries)
+        template_contents['code_generator'] = module_pyname
+
+        template_filename = 'dart_blink.template'
+        template = self.jinja_env.get_template(template_filename)
+
+        text = template.render(template_contents)
+        return text
+
+
+def initialize_jinja_env(cache_dir):
+    jinja_env = jinja2.Environment(
+        loader=jinja2.FileSystemLoader(templates_dir),
+        # Bytecode cache is not concurrency-safe unless pre-cached:
+        # if pre-cached this is read-only, but writing creates a race condition.
+        # bytecode_cache=jinja2.FileSystemBytecodeCache(cache_dir),
+        keep_trailing_newline=True,  # newline-terminate generated files
+        lstrip_blocks=True,  # so can indent control flow tags
+        trim_blocks=True)
+    jinja_env.filters.update({
+        'blink_capitalize': DartUtilities.capitalize,
+        })
+    return jinja_env
+
+
+################################################################################
+
+def main(argv):
+    # If file itself executed, cache templates
+    try:
+        cache_dir = argv[1]
+        dummy_filename = argv[2]
+    except IndexError as err:
+        print 'Usage: %s OUTPUT_DIR DUMMY_FILENAME' % argv[0]
+        return 1
+
+    # Cache templates
+    jinja_env = initialize_jinja_env(cache_dir)
+    template_filenames = [filename for filename in os.listdir(templates_dir)
+                          # Skip .svn, directories, etc.
+                          if filename.endswith(('.cpp', '.h', '.template'))]
+    for template_filename in template_filenames:
+        jinja_env.get_template(template_filename)
+
+    # Create a dummy file as output for the build system,
+    # since filenames of individual cache files are unpredictable and opaque
+    # (they are hashes of the template path, which varies based on environment)
+    with open(dummy_filename, 'w') as dummy_file:
+        pass  # |open| creates or touches the file
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))