Source/bindings/scripts/unstable/v8_utilities.py

# Copyright (C) 2013 Google Inc. All rights reserved.
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"""Functions shared by various parts of the code generator.

FIXME: Not currently used in build.
This is a rewrite of the Perl IDL compiler in Python, but is not complete.
Once it is complete, we will switch all IDL files over to Python at once.
Until then, please work on the Perl IDL compiler.
For details, see bug http://crbug.com/239771
"""

# FIXME: eliminate this file if possible

import re
import v8_types

ACRONYMS = ['CSS', 'HTML', 'IME', 'JS', 'SVG', 'URL', 'WOFF', 'XML', 'XSLT']


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(extended_attributes, key, value):
    return (key in extended_attributes and
            value in re.split('[|&]', extended_attributes[key]))


def uncapitalize(name):
    """Uncapitalizes first letter or initial acronym (* with some exceptions).

    E.g., 'SetURL' becomes 'setURL', but 'URLFoo' becomes 'urlFoo'.
    Used in method names; exceptions differ from capitalize().
    """
    for acronym in ACRONYMS:
        if name.startswith(acronym):
            name.replace(acronym, acronym.lower())
            return name
    return name[0].lower() + name[1:]


def v8_class_name(interface):
    return v8_types.v8_type(interface.name)


# [ActivityLogging]
def has_activity_logging(member, includes, access_type=None):
    """Returns whether a definition member has activity logging of specified access type.

    access_type can be 'Getter' or 'Setter' if only checking getting or setting.
    """
    if 'ActivityLogging' not in member.extended_attributes:
        return False
    activity_logging = member.extended_attributes['ActivityLogging']
    # ActivityLogging=Access means log for all access, otherwise check that
    # value agrees with specified access_type.
    has_logging = activity_logging in ['Access', access_type]
    if has_logging:
        includes.update(['bindings/v8/V8Binding.h',
                         'bindings/v8/V8DOMActivityLogger.h',
                         'wtf/Vector.h'])
    return has_logging


# [CallWith]
CALL_WITH_ARGUMENTS = {
    'ScriptState': '&state',
    'ExecutionContext': 'scriptContext',
    'ScriptArguments': 'scriptArguments.release()',
    'ActiveWindow': 'activeDOMWindow()',
    'FirstWindow': 'firstDOMWindow()',
}
# List because key order matters, as we want arguments in deterministic order
CALL_WITH_VALUES = [
    'ScriptState',
    'ExecutionContext',
    'ScriptArguments',
    'ActiveWindow',
    'FirstWindow',
]


def call_with_arguments(member, contents):
    extended_attributes = member.extended_attributes
    if 'CallWith' not in extended_attributes:
        return []

    # FIXME: Implement other template values for setters and functions
    contents['is_call_with_script_execution_context'] = has_extended_attribute_value(extended_attributes, 'CallWith', 'ExecutionContext')

    return [CALL_WITH_ARGUMENTS[value]
            for value in CALL_WITH_VALUES
            if has_extended_attribute_value(extended_attributes, 'CallWith', value)]


# [Conditional]
def generate_conditional_string(definition_or_member):
    if 'Conditional' not in definition_or_member.extended_attributes:
        return None
    conditional = definition_or_member.extended_attributes['Conditional']
    for operator in '&|':
        if operator in conditional:
            conditions = set(conditional.split(operator))
            operator_separator = ' %s%s ' % (operator, operator)
            return operator_separator.join('ENABLE(%s)' % expression for expression in sorted(conditions))
    return 'ENABLE(%s)' % conditional


# [DeprecateAs]
def generate_deprecate_as(member, contents, includes):
    deprecate_as = member.extended_attributes.get('DeprecateAs')
    if not deprecate_as:
        return
    contents['deprecate_as'] = deprecate_as
    includes.update(['core/page/UseCounter.h'])


# [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
    """
    extended_attributes = definition_or_member.extended_attributes
    if 'RuntimeEnabled' not in extended_attributes:
        return None
    feature_name = extended_attributes['RuntimeEnabled']
    return 'RuntimeEnabledFeatures::%sEnabled' % uncapitalize(feature_name)


# [ImplementedAs]
def cpp_name(definition_or_member):
    return definition_or_member.extended_attributes.get('ImplementedAs', definition_or_member.name)


# [MeasureAs]
def generate_measure_as(definition_or_member, contents, includes):
    if 'MeasureAs' not in definition_or_member.extended_attributes:
        return
    contents['measure_as'] = definition_or_member.extended_attributes['MeasureAs']
    includes.add('core/page/UseCounter.h')