| # 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. |
| |
| """Functions shared by various parts of the code generator. |
| |
| Design doc: http://www.chromium.org/developers/design-documents/idl-compiler |
| """ |
| |
| import re |
| |
| from idl_types import IdlTypeBase |
| import idl_types |
| from idl_definitions import Exposure, IdlInterface, IdlAttribute |
| from v8_globals import includes |
| |
| ACRONYMS = [ |
| 'CSSOM', # must come *before* CSS to match full acronym |
| 'CSS', |
| 'HTML', |
| 'IME', |
| 'JS', |
| 'SVG', |
| 'URL', |
| 'WOFF', |
| 'XML', |
| 'XSLT', |
| ] |
| |
| |
| ################################################################################ |
| # Extended attribute parsing |
| ################################################################################ |
| |
| def extended_attribute_value_contains(extended_attribute_value, key): |
| return (extended_attribute_value == key or |
| (isinstance(extended_attribute_value, list) and |
| key in extended_attribute_value)) |
| |
| |
| def has_extended_attribute(definition_or_member, extended_attribute_list): |
| return any(extended_attribute in definition_or_member.extended_attributes |
| for extended_attribute in extended_attribute_list) |
| |
| |
| def has_extended_attribute_value(definition_or_member, name, value): |
| extended_attributes = definition_or_member.extended_attributes |
| return (name in extended_attributes and |
| extended_attribute_value_contains(extended_attributes[name], value)) |
| |
| |
| def extended_attribute_value_as_list(definition_or_member, name): |
| extended_attributes = definition_or_member.extended_attributes |
| if name not in extended_attributes: |
| return None |
| value = extended_attributes[name] |
| if isinstance(value, list): |
| return value |
| return [value] |
| |
| |
| ################################################################################ |
| # String handling |
| ################################################################################ |
| |
| def capitalize(name): |
| """Capitalize first letter or initial acronym (used in setter names).""" |
| for acronym in ACRONYMS: |
| if name.startswith(acronym.lower()): |
| return name.replace(acronym.lower(), acronym) |
| return name[0].upper() + name[1:] |
| |
| |
| def strip_suffix(string, suffix): |
| if not suffix or not string.endswith(suffix): |
| return string |
| return string[:-len(suffix)] |
| |
| |
| def uncapitalize(name): |
| """Uncapitalizes first letter or initial acronym (used in method names). |
| |
| E.g., 'SetURL' becomes 'setURL', but 'URLFoo' becomes 'urlFoo'. |
| """ |
| for acronym in ACRONYMS: |
| if name.startswith(acronym): |
| return name.replace(acronym, acronym.lower()) |
| return name[0].lower() + name[1:] |
| |
| |
| def unique_by(dict_list, key): |
| """Returns elements from a list of dictionaries with unique values for the named key.""" |
| keys_seen = set() |
| filtered_list = [] |
| for item in dict_list: |
| if item.get(key) not in keys_seen: |
| filtered_list.append(item) |
| keys_seen.add(item.get(key)) |
| return filtered_list |
| |
| |
| def for_origin_trial_feature(items, feature_name): |
| """Filters the list of attributes or constants, and returns those defined for the named origin trial feature.""" |
| return [item for item in items if |
| item['origin_trial_feature_name'] == feature_name and |
| not item.get('exposed_test')] |
| |
| |
| ################################################################################ |
| # C++ |
| ################################################################################ |
| |
| def scoped_name(interface, definition, base_name): |
| if 'ImplementedInPrivateScript' in definition.extended_attributes: |
| return '%s::PrivateScript::%s' % (v8_class_name(interface), base_name) |
| # partial interfaces are implemented as separate classes, with their members |
| # implemented as static member functions |
| partial_interface_implemented_as = definition.extended_attributes.get('PartialInterfaceImplementedAs') |
| if partial_interface_implemented_as: |
| return '%s::%s' % (partial_interface_implemented_as, base_name) |
| if (definition.is_static or |
| definition.name in ('Constructor', 'NamedConstructor')): |
| return '%s::%s' % (cpp_name(interface), base_name) |
| return 'impl->%s' % base_name |
| |
| |
| def v8_class_name(interface): |
| return 'V8' + interface.name |
| |
| |
| def v8_class_name_or_partial(interface): |
| class_name = v8_class_name(interface) |
| if interface.is_partial: |
| return ''.join([class_name, 'Partial']) |
| return class_name |
| |
| |
| ################################################################################ |
| # Specific extended attributes |
| ################################################################################ |
| |
| # [ActivityLogging] |
| def activity_logging_world_list(member, access_type=''): |
| """Returns a set of world suffixes for which a definition member has activity logging, for specified access type. |
| |
| access_type can be 'Getter' or 'Setter' if only checking getting or setting. |
| """ |
| extended_attributes = member.extended_attributes |
| if 'LogActivity' not in extended_attributes: |
| return set() |
| log_activity = extended_attributes['LogActivity'] |
| if log_activity and not log_activity.startswith(access_type): |
| return set() |
| |
| includes.add('bindings/core/v8/V8DOMActivityLogger.h') |
| if 'LogAllWorlds' in extended_attributes: |
| return set(['', 'ForMainWorld']) |
| return set(['']) # At minimum, include isolated worlds. |
| |
| |
| # [ActivityLogging] |
| def activity_logging_world_check(member): |
| """Returns if an isolated world check is required when generating activity |
| logging code. |
| |
| The check is required when there is no per-world binding code and logging is |
| required only for isolated world. |
| """ |
| extended_attributes = member.extended_attributes |
| if 'LogActivity' not in extended_attributes: |
| return False |
| if ('PerWorldBindings' not in extended_attributes and |
| 'LogAllWorlds' not in extended_attributes): |
| return True |
| return False |
| |
| |
| # [CallWith] |
| CALL_WITH_ARGUMENTS = { |
| 'ScriptState': 'scriptState', |
| 'ExecutionContext': 'executionContext', |
| 'ScriptArguments': 'scriptArguments', |
| 'CurrentWindow': 'currentDOMWindow(info.GetIsolate())', |
| 'EnteredWindow': 'enteredDOMWindow(info.GetIsolate())', |
| 'Document': 'document', |
| 'ThisValue': 'ScriptValue(scriptState, info.Holder())', |
| } |
| # List because key order matters, as we want arguments in deterministic order |
| CALL_WITH_VALUES = [ |
| 'ScriptState', |
| 'ExecutionContext', |
| 'ScriptArguments', |
| 'CurrentWindow', |
| 'EnteredWindow', |
| 'Document', |
| 'ThisValue', |
| ] |
| |
| |
| def call_with_arguments(call_with_values): |
| if not call_with_values: |
| return [] |
| return [CALL_WITH_ARGUMENTS[value] |
| for value in CALL_WITH_VALUES |
| if extended_attribute_value_contains(call_with_values, value)] |
| |
| |
| # [Constructor], [NamedConstructor] |
| def is_constructor_attribute(member): |
| # TODO(yukishiino): replace this with [Constructor] and [NamedConstructor] extended attribute |
| return (type(member) == IdlAttribute and |
| member.idl_type.name.endswith('Constructor')) |
| |
| |
| # [DeprecateAs] |
| def deprecate_as(member): |
| extended_attributes = member.extended_attributes |
| if 'DeprecateAs' not in extended_attributes: |
| return None |
| includes.add('core/frame/Deprecation.h') |
| return extended_attributes['DeprecateAs'] |
| |
| |
| # [Exposed] |
| EXPOSED_EXECUTION_CONTEXT_METHOD = { |
| 'AnimationWorklet': 'isAnimationWorkletGlobalScope', |
| 'CompositorWorker': 'isCompositorWorkerGlobalScope', |
| 'DedicatedWorker': 'isDedicatedWorkerGlobalScope', |
| 'PaintWorklet': 'isPaintWorkletGlobalScope', |
| 'ServiceWorker': 'isServiceWorkerGlobalScope', |
| 'SharedWorker': 'isSharedWorkerGlobalScope', |
| 'Window': 'isDocument', |
| 'Worker': 'isWorkerGlobalScope', |
| 'Worklet': 'isWorkletGlobalScope', |
| } |
| |
| |
| EXPOSED_WORKERS = set([ |
| 'CompositorWorker', |
| 'DedicatedWorker', |
| 'SharedWorker', |
| 'ServiceWorker', |
| ]) |
| |
| |
| class ExposureSet: |
| """An ExposureSet is a collection of Exposure instructions.""" |
| def __init__(self, exposures=None): |
| self.exposures = set(exposures) if exposures else set() |
| |
| def issubset(self, other): |
| """Returns true if |self|'s exposure set is a subset of |
| |other|'s exposure set. This function doesn't care about |
| RuntimeEnabled.""" |
| self_set = self._extended(set(e.exposed for e in self.exposures)) |
| other_set = self._extended(set(e.exposed for e in other.exposures)) |
| return self_set.issubset(other_set) |
| |
| @staticmethod |
| def _extended(target): |
| if EXPOSED_WORKERS.issubset(target): |
| return target | set(['Worker']) |
| elif 'Worker' in target: |
| return target | EXPOSED_WORKERS |
| return target |
| |
| def add(self, exposure): |
| self.exposures.add(exposure) |
| |
| def __len__(self): |
| return len(self.exposures) |
| |
| def __iter__(self): |
| return self.exposures.__iter__() |
| |
| @staticmethod |
| def _code(exposure): |
| exposed = ('executionContext->%s()' % |
| EXPOSED_EXECUTION_CONTEXT_METHOD[exposure.exposed]) |
| if exposure.runtime_enabled is not None: |
| runtime_enabled = ('RuntimeEnabledFeatures::%sEnabled()' % |
| uncapitalize(exposure.runtime_enabled)) |
| return '({0} && {1})'.format(exposed, runtime_enabled) |
| return exposed |
| |
| def code(self): |
| if len(self.exposures) == 0: |
| return None |
| # We use sorted here to deflake output. |
| return ' || '.join(sorted(self._code(e) for e in self.exposures)) |
| |
| |
| def exposed(member, interface): |
| """Returns a C++ code that checks if a method/attribute/etc is exposed. |
| |
| When the Exposed attribute contains RuntimeEnabledFeatures (i.e. |
| Exposed(Arguments) form is given), the code contains check for them as |
| well. |
| |
| EXAMPLE: [Exposed=Window, RuntimeEnabledFeature=Feature1] |
| => context->isDocument() |
| |
| EXAMPLE: [Exposed(Window Feature1, Window Feature2)] |
| => context->isDocument() && RuntimeEnabledFeatures::feature1Enabled() || |
| context->isDocument() && RuntimeEnabledFeatures::feature2Enabled() |
| """ |
| exposure_set = ExposureSet( |
| extended_attribute_value_as_list(member, 'Exposed')) |
| interface_exposure_set = ExposureSet( |
| extended_attribute_value_as_list(interface, 'Exposed')) |
| for e in exposure_set: |
| if e.exposed not in EXPOSED_EXECUTION_CONTEXT_METHOD: |
| raise ValueError('Invalid execution context: %s' % e.exposed) |
| |
| # Methods must not be exposed to a broader scope than their interface. |
| if not exposure_set.issubset(interface_exposure_set): |
| raise ValueError('Interface members\' exposure sets must be a subset of the interface\'s.') |
| |
| return exposure_set.code() |
| |
| |
| # [SecureContext] |
| def secure_context(member, interface): |
| """Returns C++ code that checks whether an interface/method/attribute/etc. is exposed |
| to the current context.""" |
| if 'SecureContext' in member.extended_attributes or 'SecureContext' in interface.extended_attributes: |
| return "executionContext->isSecureContext()" |
| return None |
| |
| |
| # [ImplementedAs] |
| def cpp_name(definition_or_member): |
| extended_attributes = definition_or_member.extended_attributes |
| if 'ImplementedAs' not in extended_attributes: |
| return definition_or_member.name |
| return extended_attributes['ImplementedAs'] |
| |
| |
| def cpp_name_from_interfaces_info(name, interfaces_info): |
| return interfaces_info.get(name, {}).get('implemented_as') or name |
| |
| |
| def cpp_name_or_partial(interface): |
| cpp_class_name = cpp_name(interface) |
| if interface.is_partial: |
| return ''.join([cpp_class_name, 'Partial']) |
| return cpp_class_name |
| |
| |
| # [MeasureAs] |
| def measure_as(definition_or_member, interface): |
| extended_attributes = definition_or_member.extended_attributes |
| if 'MeasureAs' in extended_attributes: |
| includes.add('core/frame/UseCounter.h') |
| return lambda suffix: extended_attributes['MeasureAs'] |
| if 'Measure' in extended_attributes: |
| includes.add('core/frame/UseCounter.h') |
| measure_as_name = capitalize(definition_or_member.name) |
| if interface is not None: |
| measure_as_name = '%s_%s' % (capitalize(interface.name), measure_as_name) |
| return lambda suffix: 'V8%s_%s' % (measure_as_name, suffix) |
| return None |
| |
| |
| # [OriginTrialEnabled] |
| def origin_trial_enabled_function_name(definition_or_member): |
| """Returns the name of the OriginTrials enabled function. |
| |
| An exception is raised if both the OriginTrialEnabled and RuntimeEnabled |
| extended attributes are applied to the same IDL member. Only one of the |
| two attributes can be applied to any member - they are mutually exclusive. |
| |
| The returned function checks if the IDL member should be enabled. |
| Given extended attribute OriginTrialEnabled=FeatureName, return: |
| OriginTrials::{featureName}Enabled |
| |
| If the OriginTrialEnabled extended attribute is found, the includes are |
| also updated as a side-effect. |
| """ |
| extended_attributes = definition_or_member.extended_attributes |
| is_origin_trial_enabled = 'OriginTrialEnabled' in extended_attributes |
| |
| if is_origin_trial_enabled and 'RuntimeEnabled' in extended_attributes: |
| raise Exception('[OriginTrialEnabled] and [RuntimeEnabled] must ' |
| 'not be specified on the same definition: ' |
| '%s.%s' % (definition_or_member.idl_name, definition_or_member.name)) |
| |
| if is_origin_trial_enabled: |
| trial_name = extended_attributes['OriginTrialEnabled'] |
| return 'OriginTrials::%sEnabled' % uncapitalize(trial_name) |
| |
| is_feature_policy_enabled = 'FeaturePolicy' in extended_attributes |
| |
| if is_feature_policy_enabled and 'RuntimeEnabled' in extended_attributes: |
| raise Exception('[FeaturePolicy] and [RuntimeEnabled] must ' |
| 'not be specified on the same definition: ' |
| '%s.%s' % (definition_or_member.idl_name, definition_or_member.name)) |
| |
| if is_feature_policy_enabled: |
| includes.add('bindings/core/v8/ScriptState.h') |
| includes.add('platform/feature_policy/FeaturePolicy.h') |
| |
| trial_name = extended_attributes['FeaturePolicy'] |
| return 'FeaturePolicy::%sEnabled' % uncapitalize(trial_name) |
| |
| return None |
| |
| |
| def origin_trial_feature_name(definition_or_member): |
| extended_attributes = definition_or_member.extended_attributes |
| return extended_attributes.get('OriginTrialEnabled') or extended_attributes.get('FeaturePolicy') |
| |
| |
| def runtime_feature_name(definition_or_member): |
| extended_attributes = definition_or_member.extended_attributes |
| if 'RuntimeEnabled' not in extended_attributes: |
| return None |
| return extended_attributes['RuntimeEnabled'] |
| |
| |
| # [RuntimeEnabled] |
| def runtime_enabled_function_name(definition_or_member): |
| """Returns the name of the RuntimeEnabledFeatures function. |
| |
| The returned function checks if a method/attribute is enabled. |
| Given extended attribute RuntimeEnabled=FeatureName, return: |
| RuntimeEnabledFeatures::{featureName}Enabled |
| |
| If the RuntimeEnabled extended attribute is found, the includes |
| are also updated as a side-effect. |
| """ |
| feature_name = runtime_feature_name(definition_or_member) |
| |
| if not feature_name: |
| return |
| |
| includes.add('platform/RuntimeEnabledFeatures.h') |
| return 'RuntimeEnabledFeatures::%sEnabled' % uncapitalize(feature_name) |
| |
| |
| # [Unforgeable] |
| def is_unforgeable(interface, member): |
| return (('Unforgeable' in interface.extended_attributes or |
| 'Unforgeable' in member.extended_attributes) and |
| not member.is_static) |
| |
| |
| # [LegacyInterfaceTypeChecking] |
| def is_legacy_interface_type_checking(interface, member): |
| return ('LegacyInterfaceTypeChecking' in interface.extended_attributes or |
| 'LegacyInterfaceTypeChecking' in member.extended_attributes) |
| |
| |
| # [Unforgeable], [Global], [PrimaryGlobal] |
| def on_instance(interface, member): |
| """Returns True if the interface's member needs to be defined on every |
| instance object. |
| |
| The following members must be defiend on an instance object. |
| - [Unforgeable] members |
| - regular members of [Global] or [PrimaryGlobal] interfaces |
| """ |
| if member.is_static: |
| return False |
| |
| # TODO(yukishiino): Remove a hack for toString once we support |
| # Symbol.toStringTag. |
| if (interface.name == 'Window' and member.name == 'toString'): |
| return False |
| |
| # TODO(yukishiino): Implement "interface object" and its [[Call]] method |
| # in a better way. Then we can get rid of this hack. |
| if is_constructor_attribute(member): |
| return True |
| |
| if ('PrimaryGlobal' in interface.extended_attributes or |
| 'Global' in interface.extended_attributes or |
| 'Unforgeable' in member.extended_attributes or |
| 'Unforgeable' in interface.extended_attributes): |
| return True |
| return False |
| |
| |
| def on_prototype(interface, member): |
| """Returns True if the interface's member needs to be defined on the |
| prototype object. |
| |
| Most members are defined on the prototype object. Exceptions are as |
| follows. |
| - static members (optional) |
| - [Unforgeable] members |
| - members of [Global] or [PrimaryGlobal] interfaces |
| - named properties of [Global] or [PrimaryGlobal] interfaces |
| """ |
| if member.is_static: |
| return False |
| |
| # TODO(yukishiino): Remove a hack for toString once we support |
| # Symbol.toStringTag. |
| if (interface.name == 'Window' and member.name == 'toString'): |
| return True |
| |
| # TODO(yukishiino): Implement "interface object" and its [[Call]] method |
| # in a better way. Then we can get rid of this hack. |
| if is_constructor_attribute(member): |
| return False |
| |
| if ('PrimaryGlobal' in interface.extended_attributes or |
| 'Global' in interface.extended_attributes or |
| 'Unforgeable' in member.extended_attributes or |
| 'Unforgeable' in interface.extended_attributes): |
| return False |
| return True |
| |
| |
| # static, const |
| def on_interface(interface, member): |
| """Returns True if the interface's member needs to be defined on the |
| interface object. |
| |
| The following members must be defiend on an interface object. |
| - static members |
| """ |
| if member.is_static: |
| return True |
| return False |
| |
| |
| ################################################################################ |
| # Indexed properties |
| # http://heycam.github.io/webidl/#idl-indexed-properties |
| ################################################################################ |
| |
| def indexed_property_getter(interface): |
| try: |
| # Find indexed property getter, if present; has form: |
| # getter TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG1) |
| return next( |
| method |
| for method in interface.operations |
| if ('getter' in method.specials and |
| len(method.arguments) == 1 and |
| str(method.arguments[0].idl_type) == 'unsigned long')) |
| except StopIteration: |
| return None |
| |
| |
| def indexed_property_setter(interface): |
| try: |
| # Find indexed property setter, if present; has form: |
| # setter RETURN_TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG1, ARG_TYPE ARG2) |
| return next( |
| method |
| for method in interface.operations |
| if ('setter' in method.specials and |
| len(method.arguments) == 2 and |
| str(method.arguments[0].idl_type) == 'unsigned long')) |
| except StopIteration: |
| return None |
| |
| |
| def indexed_property_deleter(interface): |
| try: |
| # Find indexed property deleter, if present; has form: |
| # deleter TYPE [OPTIONAL_IDENTIFIER](unsigned long ARG) |
| return next( |
| method |
| for method in interface.operations |
| if ('deleter' in method.specials and |
| len(method.arguments) == 1 and |
| str(method.arguments[0].idl_type) == 'unsigned long')) |
| except StopIteration: |
| return None |
| |
| |
| ################################################################################ |
| # Named properties |
| # http://heycam.github.io/webidl/#idl-named-properties |
| ################################################################################ |
| |
| def named_property_getter(interface): |
| try: |
| # Find named property getter, if present; has form: |
| # getter TYPE [OPTIONAL_IDENTIFIER](DOMString ARG1) |
| getter = next( |
| method |
| for method in interface.operations |
| if ('getter' in method.specials and |
| len(method.arguments) == 1 and |
| str(method.arguments[0].idl_type) == 'DOMString')) |
| getter.name = getter.name or 'anonymousNamedGetter' |
| return getter |
| except StopIteration: |
| return None |
| |
| |
| def named_property_setter(interface): |
| try: |
| # Find named property setter, if present; has form: |
| # setter RETURN_TYPE [OPTIONAL_IDENTIFIER](DOMString ARG1, ARG_TYPE ARG2) |
| return next( |
| method |
| for method in interface.operations |
| if ('setter' in method.specials and |
| len(method.arguments) == 2 and |
| str(method.arguments[0].idl_type) == 'DOMString')) |
| except StopIteration: |
| return None |
| |
| |
| def named_property_deleter(interface): |
| try: |
| # Find named property deleter, if present; has form: |
| # deleter TYPE [OPTIONAL_IDENTIFIER](DOMString ARG) |
| return next( |
| method |
| for method in interface.operations |
| if ('deleter' in method.specials and |
| len(method.arguments) == 1 and |
| str(method.arguments[0].idl_type) == 'DOMString')) |
| except StopIteration: |
| return None |
| |
| |
| IdlInterface.indexed_property_getter = property(indexed_property_getter) |
| IdlInterface.indexed_property_setter = property(indexed_property_setter) |
| IdlInterface.indexed_property_deleter = property(indexed_property_deleter) |
| IdlInterface.named_property_getter = property(named_property_getter) |
| IdlInterface.named_property_setter = property(named_property_setter) |
| IdlInterface.named_property_deleter = property(named_property_deleter) |
