blob: db832bef9eac39426f0247d82130804b6bcdbacf [file] [log] [blame]
# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from code import Code
from model import PropertyType
import cpp_util
import schema_util
import util_cc_helper
from cpp_namespace_environment import CppNamespaceEnvironment
class CCGenerator(object):
def __init__(self, type_generator):
self._type_generator = type_generator
def Generate(self, namespace):
return _Generator(namespace, self._type_generator).Generate()
class _Generator(object):
"""A .cc generator for a namespace.
"""
def __init__(self, namespace, cpp_type_generator):
assert type(namespace.environment) is CppNamespaceEnvironment
self._namespace = namespace
self._type_helper = cpp_type_generator
self._util_cc_helper = (
util_cc_helper.UtilCCHelper(self._type_helper))
self._generate_error_messages = namespace.compiler_options.get(
'generate_error_messages', False)
def Generate(self):
"""Generates a Code object with the .cc for a single namespace.
"""
cpp_namespace = cpp_util.GetCppNamespace(
self._namespace.environment.namespace_pattern,
self._namespace.unix_name)
c = Code()
(c.Append(cpp_util.CHROMIUM_LICENSE)
.Append()
.Append(cpp_util.GENERATED_FILE_MESSAGE % self._namespace.source_file)
.Append()
.Append(self._util_cc_helper.GetIncludePath())
.Append('#include "base/logging.h"')
.Append('#include "base/stl_util.h"')
.Append('#include "base/strings/string_number_conversions.h"')
.Append('#include "base/strings/utf_string_conversions.h"')
.Append('#include "%s/%s.h"' %
(self._namespace.source_file_dir, self._namespace.short_filename))
.Append('#include <set>')
.Cblock(self._type_helper.GenerateIncludes(include_soft=True))
.Append()
.Append('using base::UTF8ToUTF16;')
.Append()
.Concat(cpp_util.OpenNamespace(cpp_namespace))
)
if self._namespace.properties:
(c.Append('//')
.Append('// Properties')
.Append('//')
.Append()
)
for prop in self._namespace.properties.values():
property_code = self._type_helper.GeneratePropertyValues(
prop,
'const %(type)s %(name)s = %(value)s;',
nodoc=True)
if property_code:
c.Cblock(property_code)
if self._namespace.types:
(c.Append('//')
.Append('// Types')
.Append('//')
.Append()
.Cblock(self._GenerateTypes(None, self._namespace.types.values()))
)
if self._namespace.functions:
(c.Append('//')
.Append('// Functions')
.Append('//')
.Append()
)
for function in self._namespace.functions.values():
c.Cblock(self._GenerateFunction(function))
if self._namespace.events:
(c.Append('//')
.Append('// Events')
.Append('//')
.Append()
)
for event in self._namespace.events.values():
c.Cblock(self._GenerateEvent(event))
c.Cblock(cpp_util.CloseNamespace(cpp_namespace))
c.Append()
return c
def _GenerateType(self, cpp_namespace, type_):
"""Generates the function definitions for a type.
"""
classname = cpp_util.Classname(schema_util.StripNamespace(type_.name))
c = Code()
if type_.functions:
# Wrap functions within types in the type's namespace.
(c.Append('namespace %s {' % classname)
.Append())
for function in type_.functions.values():
c.Cblock(self._GenerateFunction(function))
c.Append('} // namespace %s' % classname)
elif type_.property_type == PropertyType.ARRAY:
c.Cblock(self._GenerateType(cpp_namespace, type_.item_type))
elif type_.property_type in (PropertyType.CHOICES,
PropertyType.OBJECT):
if cpp_namespace is None:
classname_in_namespace = classname
else:
classname_in_namespace = '%s::%s' % (cpp_namespace, classname)
if type_.property_type == PropertyType.OBJECT:
c.Cblock(self._GeneratePropertyFunctions(classname_in_namespace,
type_.properties.values()))
else:
c.Cblock(self._GenerateTypes(classname_in_namespace, type_.choices))
(c.Append('%s::%s()' % (classname_in_namespace, classname))
.Cblock(self._GenerateInitializersAndBody(type_))
.Append('%s::~%s() {}' % (classname_in_namespace, classname))
.Append()
)
if type_.origin.from_json:
c.Cblock(self._GenerateTypePopulate(classname_in_namespace, type_))
if cpp_namespace is None: # only generate for top-level types
c.Cblock(self._GenerateTypeFromValue(classname_in_namespace, type_))
if type_.origin.from_client:
c.Cblock(self._GenerateTypeToValue(classname_in_namespace, type_))
elif type_.property_type == PropertyType.ENUM:
(c.Cblock(self._GenerateEnumToString(cpp_namespace, type_))
.Cblock(self._GenerateEnumFromString(cpp_namespace, type_))
)
return c
def _GenerateInitializersAndBody(self, type_):
items = []
for prop in type_.properties.values():
t = prop.type_
real_t = self._type_helper.FollowRef(t)
if real_t.property_type == PropertyType.ENUM:
items.append('%s(%s)' % (
prop.unix_name,
self._type_helper.GetEnumNoneValue(t)))
elif prop.optional:
continue
elif t.property_type == PropertyType.INTEGER:
items.append('%s(0)' % prop.unix_name)
elif t.property_type == PropertyType.DOUBLE:
items.append('%s(0.0)' % prop.unix_name)
elif t.property_type == PropertyType.BOOLEAN:
items.append('%s(false)' % prop.unix_name)
elif (t.property_type == PropertyType.ANY or
t.property_type == PropertyType.ARRAY or
t.property_type == PropertyType.BINARY or
t.property_type == PropertyType.CHOICES or
t.property_type == PropertyType.OBJECT or
t.property_type == PropertyType.FUNCTION or
t.property_type == PropertyType.REF or
t.property_type == PropertyType.STRING):
# TODO(miket): It would be nice to initialize CHOICES, but we
# don't presently have the semantics to indicate which one of a set
# should be the default.
continue
else:
raise TypeError(t)
if items:
s = ': %s' % (', '.join(items))
else:
s = ''
s = s + ' {}'
return Code().Append(s)
def _GenerateTypePopulate(self, cpp_namespace, type_):
"""Generates the function for populating a type given a pointer to it.
E.g for type "Foo", generates Foo::Populate()
"""
classname = cpp_util.Classname(schema_util.StripNamespace(type_.name))
c = Code()
(c.Append('// static')
.Append('bool %(namespace)s::Populate(')
.Sblock(' %s) {' % self._GenerateParams(
('const base::Value& value', '%(name)s* out'))))
if self._generate_error_messages:
c.Append('DCHECK(error);')
if type_.property_type == PropertyType.CHOICES:
for choice in type_.choices:
(c.Sblock('if (%s) {' % self._GenerateValueIsTypeExpression('value',
choice))
.Concat(self._GeneratePopulateVariableFromValue(
choice,
'(&value)',
'out->as_%s' % choice.unix_name,
'false',
is_ptr=True))
.Append('return true;')
.Eblock('}')
)
(c.Concat(self._GenerateError(
'"expected %s, got " + %s' %
(" or ".join(choice.name for choice in type_.choices),
self._util_cc_helper.GetValueTypeString('value'))))
.Append('return false;'))
elif type_.property_type == PropertyType.OBJECT:
(c.Sblock('if (!value.IsType(base::Value::TYPE_DICTIONARY)) {')
.Concat(self._GenerateError(
'"expected dictionary, got " + ' +
self._util_cc_helper.GetValueTypeString('value')))
.Append('return false;')
.Eblock('}'))
if type_.properties or type_.additional_properties is not None:
c.Append('const base::DictionaryValue* dict = '
'static_cast<const base::DictionaryValue*>(&value);')
if self._generate_error_messages:
c.Append('std::set<std::string> keys;')
for prop in type_.properties.itervalues():
c.Concat(self._InitializePropertyToDefault(prop, 'out'))
for prop in type_.properties.itervalues():
if self._generate_error_messages:
c.Append('keys.insert("%s");' % (prop.name))
c.Concat(self._GenerateTypePopulateProperty(prop, 'dict', 'out'))
# Check for extra values.
if self._generate_error_messages:
(c.Sblock('for (base::DictionaryValue::Iterator it(*dict); '
'!it.IsAtEnd(); it.Advance()) {')
.Sblock('if (!keys.count(it.key())) {')
.Concat(self._GenerateError('"found unexpected key \'" + '
'it.key() + "\'"'))
.Eblock('}')
.Eblock('}')
)
if type_.additional_properties is not None:
if type_.additional_properties.property_type == PropertyType.ANY:
c.Append('out->additional_properties.MergeDictionary(dict);')
else:
cpp_type = self._type_helper.GetCppType(type_.additional_properties,
is_in_container=True)
(c.Append('for (base::DictionaryValue::Iterator it(*dict);')
.Sblock(' !it.IsAtEnd(); it.Advance()) {')
.Append('%s tmp;' % cpp_type)
.Concat(self._GeneratePopulateVariableFromValue(
type_.additional_properties,
'(&it.value())',
'tmp',
'false'))
.Append('out->additional_properties[it.key()] = tmp;')
.Eblock('}')
)
c.Append('return true;')
(c.Eblock('}')
.Substitute({'namespace': cpp_namespace, 'name': classname}))
return c
def _GenerateValueIsTypeExpression(self, var, type_):
real_type = self._type_helper.FollowRef(type_)
if real_type.property_type is PropertyType.CHOICES:
return '(%s)' % ' || '.join(self._GenerateValueIsTypeExpression(var,
choice)
for choice in real_type.choices)
return '%s.IsType(%s)' % (var, cpp_util.GetValueType(real_type))
def _GenerateTypePopulateProperty(self, prop, src, dst):
"""Generate the code to populate a single property in a type.
src: base::DictionaryValue*
dst: Type*
"""
c = Code()
value_var = prop.unix_name + '_value'
c.Append('const base::Value* %(value_var)s = NULL;')
if prop.optional:
(c.Sblock(
'if (%(src)s->GetWithoutPathExpansion("%(key)s", &%(value_var)s)) {')
.Concat(self._GeneratePopulatePropertyFromValue(
prop, value_var, dst, 'false')))
underlying_type = self._type_helper.FollowRef(prop.type_)
if underlying_type.property_type == PropertyType.ENUM:
(c.Append('} else {')
.Append('%%(dst)s->%%(name)s = %s;' %
self._type_helper.GetEnumNoneValue(prop.type_)))
c.Eblock('}')
else:
(c.Sblock(
'if (!%(src)s->GetWithoutPathExpansion("%(key)s", &%(value_var)s)) {')
.Concat(self._GenerateError('"\'%%(key)s\' is required"'))
.Append('return false;')
.Eblock('}')
.Concat(self._GeneratePopulatePropertyFromValue(
prop, value_var, dst, 'false'))
)
c.Append()
c.Substitute({
'value_var': value_var,
'key': prop.name,
'src': src,
'dst': dst,
'name': prop.unix_name
})
return c
def _GenerateTypeFromValue(self, cpp_namespace, type_):
classname = cpp_util.Classname(schema_util.StripNamespace(type_.name))
c = Code()
(c.Append('// static')
.Append('scoped_ptr<%s> %s::FromValue(%s) {' % (classname,
cpp_namespace, self._GenerateParams(('const base::Value& value',))))
)
if self._generate_error_messages:
c.Append('DCHECK(error);')
(c.Append(' scoped_ptr<%s> out(new %s());' % (classname, classname))
.Append(' if (!Populate(%s))' % self._GenerateArgs(
('value', 'out.get()')))
.Append(' return scoped_ptr<%s>();' % classname)
.Append(' return out.Pass();')
.Append('}')
)
return c
def _GenerateTypeToValue(self, cpp_namespace, type_):
"""Generates a function that serializes the type into a base::Value.
E.g. for type "Foo" generates Foo::ToValue()
"""
if type_.property_type == PropertyType.OBJECT:
return self._GenerateObjectTypeToValue(cpp_namespace, type_)
elif type_.property_type == PropertyType.CHOICES:
return self._GenerateChoiceTypeToValue(cpp_namespace, type_)
else:
raise ValueError("Unsupported property type %s" % type_.type_)
def _GenerateObjectTypeToValue(self, cpp_namespace, type_):
"""Generates a function that serializes an object-representing type
into a base::DictionaryValue.
"""
c = Code()
(c.Sblock('scoped_ptr<base::DictionaryValue> %s::ToValue() const {' %
cpp_namespace)
.Append('scoped_ptr<base::DictionaryValue> value('
'new base::DictionaryValue());')
.Append()
)
for prop in type_.properties.values():
prop_var = 'this->%s' % prop.unix_name
if prop.optional:
# Optional enum values are generated with a NONE enum value.
underlying_type = self._type_helper.FollowRef(prop.type_)
if underlying_type.property_type == PropertyType.ENUM:
c.Sblock('if (%s != %s) {' %
(prop_var,
self._type_helper.GetEnumNoneValue(prop.type_)))
else:
c.Sblock('if (%s.get()) {' % prop_var)
# ANY is a base::Value which is abstract and cannot be a direct member, so
# it will always be a pointer.
is_ptr = prop.optional or prop.type_.property_type == PropertyType.ANY
c.Cblock(self._CreateValueFromType(
'value->SetWithoutPathExpansion("%s", %%s);' % prop.name,
prop.name,
prop.type_,
prop_var,
is_ptr=is_ptr))
if prop.optional:
c.Eblock('}')
if type_.additional_properties is not None:
if type_.additional_properties.property_type == PropertyType.ANY:
c.Append('value->MergeDictionary(&additional_properties);')
else:
# Non-copyable types will be wrapped in a linked_ptr for inclusion in
# maps, so we need to unwrap them.
needs_unwrap = (
not self._type_helper.IsCopyable(type_.additional_properties))
(c.Sblock('for (const auto& it : additional_properties) {')
.Cblock(self._CreateValueFromType(
'value->SetWithoutPathExpansion(it.first, %s);',
type_.additional_properties.name,
type_.additional_properties,
'%sit.second' % ('*' if needs_unwrap else '')))
.Eblock('}')
)
return (c.Append()
.Append('return value.Pass();')
.Eblock('}'))
def _GenerateChoiceTypeToValue(self, cpp_namespace, type_):
"""Generates a function that serializes a choice-representing type
into a base::Value.
"""
c = Code()
c.Sblock('scoped_ptr<base::Value> %s::ToValue() const {' % cpp_namespace)
c.Append('scoped_ptr<base::Value> result;')
for choice in type_.choices:
choice_var = 'as_%s' % choice.unix_name
(c.Sblock('if (%s) {' % choice_var)
.Append('DCHECK(!result) << "Cannot set multiple choices for %s";' %
type_.unix_name)
.Cblock(self._CreateValueFromType('result.reset(%s);',
choice.name,
choice,
'*%s' % choice_var))
.Eblock('}')
)
(c.Append('DCHECK(result) << "Must set at least one choice for %s";' %
type_.unix_name)
.Append('return result.Pass();')
.Eblock('}')
)
return c
def _GenerateFunction(self, function):
"""Generates the definitions for function structs.
"""
c = Code()
# TODO(kalman): use function.unix_name not Classname.
function_namespace = cpp_util.Classname(function.name)
# Windows has a #define for SendMessage, so to avoid any issues, we need
# to not use the name.
if function_namespace == 'SendMessage':
function_namespace = 'PassMessage'
(c.Append('namespace %s {' % function_namespace)
.Append()
)
# Params::Populate function
if function.params:
c.Concat(self._GeneratePropertyFunctions('Params', function.params))
(c.Append('Params::Params() {}')
.Append('Params::~Params() {}')
.Append()
.Cblock(self._GenerateFunctionParamsCreate(function))
)
# Results::Create function
if function.callback:
c.Concat(self._GenerateCreateCallbackArguments('Results',
function.callback))
c.Append('} // namespace %s' % function_namespace)
return c
def _GenerateEvent(self, event):
# TODO(kalman): use event.unix_name not Classname.
c = Code()
event_namespace = cpp_util.Classname(event.name)
(c.Append('namespace %s {' % event_namespace)
.Append()
.Cblock(self._GenerateEventNameConstant(event))
.Cblock(self._GenerateCreateCallbackArguments(None, event))
.Append('} // namespace %s' % event_namespace)
)
return c
def _CreateValueFromType(self, code, prop_name, type_, var, is_ptr=False):
"""Creates a base::Value given a type. Generated code passes ownership
to caller.
var: variable or variable*
E.g for std::string, generate new base::StringValue(var)
"""
c = Code()
underlying_type = self._type_helper.FollowRef(type_)
if underlying_type.property_type == PropertyType.ARRAY:
# Enums are treated specially because C++ templating thinks that they're
# ints, but really they're strings. So we create a vector of strings and
# populate it with the names of the enum in the array. The |ToString|
# function of the enum can be in another namespace when the enum is
# referenced. Templates can not be used here because C++ templating does
# not support passing a namespace as an argument.
item_type = self._type_helper.FollowRef(underlying_type.item_type)
if item_type.property_type == PropertyType.ENUM:
varname = ('*' if is_ptr else '') + '(%s)' % var
maybe_namespace = ''
if type_.item_type.property_type == PropertyType.REF:
maybe_namespace = '%s::' % item_type.namespace.unix_name
enum_list_var = '%s_list' % prop_name
# Scope the std::vector variable declaration inside braces.
(c.Sblock('{')
.Append('std::vector<std::string> %s;' % enum_list_var)
.Append('for (const auto& it : %s) {' % varname)
.Append('%s.push_back(%sToString(it));' % (enum_list_var,
maybe_namespace))
.Eblock('}'))
# Because the std::vector above is always created for both required and
# optional enum arrays, |is_ptr| is set to false and uses the
# std::vector to create the values.
(c.Append(code %
self._GenerateCreateValueFromType(type_, enum_list_var, False))
.Eblock('}'))
return c
c.Append(code % self._GenerateCreateValueFromType(type_, var, is_ptr))
return c
def _GenerateCreateValueFromType(self, type_, var, is_ptr):
"""Generates the statement to create a base::Value given a type.
type_: The type of the values being converted.
var: The name of the variable.
is_ptr: Whether |type_| is optional.
"""
underlying_type = self._type_helper.FollowRef(type_)
if (underlying_type.property_type == PropertyType.CHOICES or
underlying_type.property_type == PropertyType.OBJECT):
if is_ptr:
return '(%s)->ToValue().release()' % var
else:
return '(%s).ToValue().release()' % var
elif (underlying_type.property_type == PropertyType.ANY or
underlying_type.property_type == PropertyType.FUNCTION):
if is_ptr:
vardot = '(%s)->' % var
else:
vardot = '(%s).' % var
return '%sDeepCopy()' % vardot
elif underlying_type.property_type == PropertyType.ENUM:
maybe_namespace = ''
if type_.property_type == PropertyType.REF:
maybe_namespace = '%s::' % underlying_type.namespace.unix_name
return 'new base::StringValue(%sToString(%s))' % (maybe_namespace, var)
elif underlying_type.property_type == PropertyType.BINARY:
if is_ptr:
vardot = var + '->'
ref = var + '.get()'
else:
vardot = var + '.'
ref = '&' + var
return ('base::BinaryValue::CreateWithCopiedBuffer(vector_as_array(%s),'
' %ssize())' % (ref, vardot))
elif underlying_type.property_type == PropertyType.ARRAY:
return '%s.release()' % self._util_cc_helper.CreateValueFromArray(
var,
is_ptr)
elif underlying_type.property_type.is_fundamental:
if is_ptr:
var = '*%s' % var
if underlying_type.property_type == PropertyType.STRING:
return 'new base::StringValue(%s)' % var
else:
return 'new base::FundamentalValue(%s)' % var
else:
raise NotImplementedError('Conversion of %s to base::Value not '
'implemented' % repr(type_.type_))
def _GenerateParamsCheck(self, function, var):
"""Generates a check for the correct number of arguments when creating
Params.
"""
c = Code()
num_required = 0
for param in function.params:
if not param.optional:
num_required += 1
if num_required == len(function.params):
c.Sblock('if (%(var)s.GetSize() != %(total)d) {')
elif not num_required:
c.Sblock('if (%(var)s.GetSize() > %(total)d) {')
else:
c.Sblock('if (%(var)s.GetSize() < %(required)d'
' || %(var)s.GetSize() > %(total)d) {')
(c.Concat(self._GenerateError(
'"expected %%(total)d arguments, got " '
'+ base::IntToString(%%(var)s.GetSize())'))
.Append('return scoped_ptr<Params>();')
.Eblock('}')
.Substitute({
'var': var,
'required': num_required,
'total': len(function.params),
}))
return c
def _GenerateFunctionParamsCreate(self, function):
"""Generate function to create an instance of Params. The generated
function takes a base::ListValue of arguments.
E.g for function "Bar", generate Bar::Params::Create()
"""
c = Code()
(c.Append('// static')
.Sblock('scoped_ptr<Params> Params::Create(%s) {' % self._GenerateParams(
['const base::ListValue& args']))
)
if self._generate_error_messages:
c.Append('DCHECK(error);')
(c.Concat(self._GenerateParamsCheck(function, 'args'))
.Append('scoped_ptr<Params> params(new Params());')
)
for param in function.params:
c.Concat(self._InitializePropertyToDefault(param, 'params'))
for i, param in enumerate(function.params):
# Any failure will cause this function to return. If any argument is
# incorrect or missing, those following it are not processed. Note that
# for optional arguments, we allow missing arguments and proceed because
# there may be other arguments following it.
failure_value = 'scoped_ptr<Params>()'
c.Append()
value_var = param.unix_name + '_value'
(c.Append('const base::Value* %(value_var)s = NULL;')
.Append('if (args.Get(%(i)s, &%(value_var)s) &&')
.Sblock(' !%(value_var)s->IsType(base::Value::TYPE_NULL)) {')
.Concat(self._GeneratePopulatePropertyFromValue(
param, value_var, 'params', failure_value))
.Eblock('}')
)
if not param.optional:
(c.Sblock('else {')
.Concat(self._GenerateError('"\'%%(key)s\' is required"'))
.Append('return %s;' % failure_value)
.Eblock('}'))
c.Substitute({'value_var': value_var, 'i': i, 'key': param.name})
(c.Append()
.Append('return params.Pass();')
.Eblock('}')
.Append()
)
return c
def _GeneratePopulatePropertyFromValue(self,
prop,
src_var,
dst_class_var,
failure_value):
"""Generates code to populate property |prop| of |dst_class_var| (a
pointer) from a Value*. See |_GeneratePopulateVariableFromValue| for
semantics.
"""
return self._GeneratePopulateVariableFromValue(prop.type_,
src_var,
'%s->%s' % (dst_class_var,
prop.unix_name),
failure_value,
is_ptr=prop.optional)
def _GeneratePopulateVariableFromValue(self,
type_,
src_var,
dst_var,
failure_value,
is_ptr=False):
"""Generates code to populate a variable |dst_var| of type |type_| from a
Value* at |src_var|. The Value* is assumed to be non-NULL. In the generated
code, if |dst_var| fails to be populated then Populate will return
|failure_value|.
"""
c = Code()
underlying_type = self._type_helper.FollowRef(type_)
if underlying_type.property_type.is_fundamental:
if is_ptr:
(c.Append('%(cpp_type)s temp;')
.Sblock('if (!%s) {' % cpp_util.GetAsFundamentalValue(
self._type_helper.FollowRef(type_), src_var, '&temp'))
.Concat(self._GenerateError(
'"\'%%(key)s\': expected ' + '%s, got " + %s' % (
type_.name,
self._util_cc_helper.GetValueTypeString(
'%%(src_var)s', True)))))
c.Append('%(dst_var)s.reset();')
if not self._generate_error_messages:
c.Append('return %(failure_value)s;')
(c.Eblock('}')
.Append('else')
.Append(' %(dst_var)s.reset(new %(cpp_type)s(temp));')
)
else:
(c.Sblock('if (!%s) {' % cpp_util.GetAsFundamentalValue(
self._type_helper.FollowRef(type_),
src_var,
'&%s' % dst_var))
.Concat(self._GenerateError(
'"\'%%(key)s\': expected ' + '%s, got " + %s' % (
type_.name,
self._util_cc_helper.GetValueTypeString(
'%%(src_var)s', True))))
.Append('return %(failure_value)s;')
.Eblock('}')
)
elif underlying_type.property_type == PropertyType.OBJECT:
if is_ptr:
(c.Append('const base::DictionaryValue* dictionary = NULL;')
.Sblock('if (!%(src_var)s->GetAsDictionary(&dictionary)) {')
.Concat(self._GenerateError(
'"\'%%(key)s\': expected dictionary, got " + ' +
self._util_cc_helper.GetValueTypeString('%%(src_var)s', True))))
# If an optional property fails to populate, the population can still
# succeed with a warning. If no error messages are generated, this
# warning is not set and we fail out instead.
if not self._generate_error_messages:
c.Append('return %(failure_value)s;')
(c.Eblock('}')
.Sblock('else {')
.Append('scoped_ptr<%(cpp_type)s> temp(new %(cpp_type)s());')
.Append('if (!%%(cpp_type)s::Populate(%s)) {' % self._GenerateArgs(
('*dictionary', 'temp.get()')))
.Append(' return %(failure_value)s;')
)
(c.Append('}')
.Append('else')
.Append(' %(dst_var)s = temp.Pass();')
.Eblock('}')
)
else:
(c.Append('const base::DictionaryValue* dictionary = NULL;')
.Sblock('if (!%(src_var)s->GetAsDictionary(&dictionary)) {')
.Concat(self._GenerateError(
'"\'%%(key)s\': expected dictionary, got " + ' +
self._util_cc_helper.GetValueTypeString('%%(src_var)s', True)))
.Append('return %(failure_value)s;')
.Eblock('}')
.Append('if (!%%(cpp_type)s::Populate(%s)) {' % self._GenerateArgs(
('*dictionary', '&%(dst_var)s')))
.Append(' return %(failure_value)s;')
.Append('}')
)
elif underlying_type.property_type == PropertyType.FUNCTION:
if is_ptr:
c.Append('%(dst_var)s.reset(new base::DictionaryValue());')
elif underlying_type.property_type == PropertyType.ANY:
c.Append('%(dst_var)s.reset(%(src_var)s->DeepCopy());')
elif underlying_type.property_type == PropertyType.ARRAY:
# util_cc_helper deals with optional and required arrays
(c.Append('const base::ListValue* list = NULL;')
.Sblock('if (!%(src_var)s->GetAsList(&list)) {')
.Concat(self._GenerateError(
'"\'%%(key)s\': expected list, got " + ' +
self._util_cc_helper.GetValueTypeString('%%(src_var)s', True)))
)
if is_ptr and self._generate_error_messages:
c.Append('%(dst_var)s.reset();')
else:
c.Append('return %(failure_value)s;')
c.Eblock('}')
c.Sblock('else {')
item_type = self._type_helper.FollowRef(underlying_type.item_type)
if item_type.property_type == PropertyType.ENUM:
c.Concat(self._GenerateListValueToEnumArrayConversion(
item_type,
'list',
dst_var,
failure_value,
is_ptr=is_ptr))
else:
c.Sblock('if (!%s) {' % self._util_cc_helper.PopulateArrayFromList(
'list',
dst_var,
is_ptr))
c.Concat(self._GenerateError(
'"unable to populate array \'%%(parent_key)s\'"'))
if is_ptr and self._generate_error_messages:
c.Append('%(dst_var)s.reset();')
else:
c.Append('return %(failure_value)s;')
c.Eblock('}')
c.Eblock('}')
elif underlying_type.property_type == PropertyType.CHOICES:
if is_ptr:
(c.Append('scoped_ptr<%(cpp_type)s> temp(new %(cpp_type)s());')
.Append('if (!%%(cpp_type)s::Populate(%s))' % self._GenerateArgs(
('*%(src_var)s', 'temp.get()')))
.Append(' return %(failure_value)s;')
.Append('%(dst_var)s = temp.Pass();')
)
else:
(c.Append('if (!%%(cpp_type)s::Populate(%s))' % self._GenerateArgs(
('*%(src_var)s', '&%(dst_var)s')))
.Append(' return %(failure_value)s;'))
elif underlying_type.property_type == PropertyType.ENUM:
c.Concat(self._GenerateStringToEnumConversion(underlying_type,
src_var,
dst_var,
failure_value))
elif underlying_type.property_type == PropertyType.BINARY:
(c.Append('const base::BinaryValue* binary_value = NULL;')
.Sblock('if (!%(src_var)s->IsType(base::Value::TYPE_BINARY)) {')
.Concat(self._GenerateError(
'"\'%%(key)s\': expected binary, got " + ' +
self._util_cc_helper.GetValueTypeString('%%(src_var)s', True)))
)
if not self._generate_error_messages:
c.Append('return %(failure_value)s;')
(c.Eblock('}')
.Sblock('else {')
.Append(' binary_value =')
.Append(' static_cast<const base::BinaryValue*>(%(src_var)s);')
)
if is_ptr:
(c.Append('%(dst_var)s.reset(new std::vector<char>(')
.Append(' binary_value->GetBuffer(),')
.Append(' binary_value->GetBuffer() + binary_value->GetSize()));')
)
else:
(c.Append('%(dst_var)s.assign(')
.Append(' binary_value->GetBuffer(),')
.Append(' binary_value->GetBuffer() + binary_value->GetSize());')
)
c.Eblock('}')
else:
raise NotImplementedError(type_)
if c.IsEmpty():
return c
return Code().Sblock('{').Concat(c.Substitute({
'cpp_type': self._type_helper.GetCppType(type_),
'src_var': src_var,
'dst_var': dst_var,
'failure_value': failure_value,
'key': type_.name,
'parent_key': type_.parent.name,
})).Eblock('}')
def _GenerateListValueToEnumArrayConversion(self,
item_type,
src_var,
dst_var,
failure_value,
is_ptr=False):
"""Returns Code that converts a ListValue of string constants from
|src_var| into an array of enums of |type_| in |dst_var|. On failure,
returns |failure_value|.
"""
c = Code()
accessor = '.'
if is_ptr:
accessor = '->'
cpp_type = self._type_helper.GetCppType(item_type, is_in_container=True)
c.Append('%s.reset(new std::vector<%s>);' %
(dst_var, cpp_util.PadForGenerics(cpp_type)))
(c.Sblock('for (const auto& it : *(%s)) {' % src_var)
.Append('%s tmp;' % self._type_helper.GetCppType(item_type))
.Concat(self._GenerateStringToEnumConversion(item_type,
'(it)',
'tmp',
failure_value))
.Append('%s%spush_back(tmp);' % (dst_var, accessor))
.Eblock('}')
)
return c
def _GenerateStringToEnumConversion(self,
type_,
src_var,
dst_var,
failure_value):
"""Returns Code that converts a string type in |src_var| to an enum with
type |type_| in |dst_var|. In the generated code, if |src_var| is not
a valid enum name then the function will return |failure_value|.
"""
if type_.property_type != PropertyType.ENUM:
raise TypeError(type_)
c = Code()
enum_as_string = '%s_as_string' % type_.unix_name
cpp_type_namespace = ''
if type_.namespace != self._namespace:
cpp_type_namespace = '%s::' % type_.namespace.unix_name
(c.Append('std::string %s;' % enum_as_string)
.Sblock('if (!%s->GetAsString(&%s)) {' % (src_var, enum_as_string))
.Concat(self._GenerateError(
'"\'%%(key)s\': expected string, got " + ' +
self._util_cc_helper.GetValueTypeString('%%(src_var)s', True)))
.Append('return %s;' % failure_value)
.Eblock('}')
.Append('%s = %sParse%s(%s);' % (dst_var,
cpp_type_namespace,
cpp_util.Classname(type_.name),
enum_as_string))
.Sblock('if (%s == %s%s) {' % (dst_var,
cpp_type_namespace,
self._type_helper.GetEnumNoneValue(type_)))
.Concat(self._GenerateError(
'\"\'%%(key)s\': expected \\"' +
'\\" or \\"'.join(
enum_value.name
for enum_value in self._type_helper.FollowRef(type_).enum_values) +
'\\", got \\"" + %s + "\\""' % enum_as_string))
.Append('return %s;' % failure_value)
.Eblock('}')
.Substitute({'src_var': src_var, 'key': type_.name})
)
return c
def _GeneratePropertyFunctions(self, namespace, params):
"""Generates the member functions for a list of parameters.
"""
return self._GenerateTypes(namespace, (param.type_ for param in params))
def _GenerateTypes(self, namespace, types):
"""Generates the member functions for a list of types.
"""
c = Code()
for type_ in types:
c.Cblock(self._GenerateType(namespace, type_))
return c
def _GenerateEnumToString(self, cpp_namespace, type_):
"""Generates ToString() which gets the string representation of an enum.
"""
c = Code()
classname = cpp_util.Classname(schema_util.StripNamespace(type_.name))
if cpp_namespace is not None:
c.Append('// static')
maybe_namespace = '' if cpp_namespace is None else '%s::' % cpp_namespace
c.Sblock('std::string %sToString(%s enum_param) {' %
(maybe_namespace, classname))
c.Sblock('switch (enum_param) {')
for enum_value in self._type_helper.FollowRef(type_).enum_values:
name = enum_value.name
if 'camel_case_enum_to_string' in self._namespace.compiler_options:
name = enum_value.CamelName()
(c.Append('case %s: ' % self._type_helper.GetEnumValue(type_, enum_value))
.Append(' return "%s";' % name))
(c.Append('case %s:' % self._type_helper.GetEnumNoneValue(type_))
.Append(' return "";')
.Eblock('}')
.Append('NOTREACHED();')
.Append('return "";')
.Eblock('}')
)
return c
def _GenerateEnumFromString(self, cpp_namespace, type_):
"""Generates FromClassNameString() which gets an enum from its string
representation.
"""
c = Code()
classname = cpp_util.Classname(schema_util.StripNamespace(type_.name))
if cpp_namespace is not None:
c.Append('// static')
maybe_namespace = '' if cpp_namespace is None else '%s::' % cpp_namespace
c.Sblock('%s%s %sParse%s(const std::string& enum_string) {' %
(maybe_namespace, classname, maybe_namespace, classname))
for _, enum_value in enumerate(
self._type_helper.FollowRef(type_).enum_values):
# This is broken up into all ifs with no else ifs because we get
# "fatal error C1061: compiler limit : blocks nested too deeply"
# on Windows.
(c.Append('if (enum_string == "%s")' % enum_value.name)
.Append(' return %s;' %
self._type_helper.GetEnumValue(type_, enum_value)))
(c.Append('return %s;' % self._type_helper.GetEnumNoneValue(type_))
.Eblock('}')
)
return c
def _GenerateCreateCallbackArguments(self,
function_scope,
callback):
"""Generate all functions to create Value parameters for a callback.
E.g for function "Bar", generate Bar::Results::Create
E.g for event "Baz", generate Baz::Create
function_scope: the function scope path, e.g. Foo::Bar for the function
Foo::Bar::Baz(). May be None if there is no function scope.
callback: the Function object we are creating callback arguments for.
"""
c = Code()
params = callback.params
c.Concat(self._GeneratePropertyFunctions(function_scope, params))
(c.Sblock('scoped_ptr<base::ListValue> %(function_scope)s'
'Create(%(declaration_list)s) {')
.Append('scoped_ptr<base::ListValue> create_results('
'new base::ListValue());')
)
declaration_list = []
for param in params:
declaration_list.append(cpp_util.GetParameterDeclaration(
param, self._type_helper.GetCppType(param.type_)))
c.Cblock(self._CreateValueFromType('create_results->Append(%s);',
param.name,
param.type_,
param.unix_name))
c.Append('return create_results.Pass();')
c.Eblock('}')
c.Substitute({
'function_scope': ('%s::' % function_scope) if function_scope else '',
'declaration_list': ', '.join(declaration_list),
'param_names': ', '.join(param.unix_name for param in params)
})
return c
def _GenerateEventNameConstant(self, event):
"""Generates a constant string array for the event name.
"""
c = Code()
c.Append('const char kEventName[] = "%s.%s";' % (
self._namespace.name, event.name))
return c
def _InitializePropertyToDefault(self, prop, dst):
"""Initialize a model.Property to its default value inside an object.
E.g for optional enum "state", generate dst->state = STATE_NONE;
dst: Type*
"""
c = Code()
underlying_type = self._type_helper.FollowRef(prop.type_)
if (underlying_type.property_type == PropertyType.ENUM and
prop.optional):
c.Append('%s->%s = %s;' % (
dst,
prop.unix_name,
self._type_helper.GetEnumNoneValue(prop.type_)))
return c
def _GenerateError(self, body):
"""Generates an error message pertaining to population failure.
E.g 'expected bool, got int'
"""
c = Code()
if not self._generate_error_messages:
return c
(c.Append('if (error->length())')
.Append(' error->append(UTF8ToUTF16("; "));')
.Append('error->append(UTF8ToUTF16(%s));' % body))
return c
def _GenerateParams(self, params):
"""Builds the parameter list for a function, given an array of parameters.
"""
if self._generate_error_messages:
params = list(params) + ['base::string16* error']
return ', '.join(str(p) for p in params)
def _GenerateArgs(self, args):
"""Builds the argument list for a function, given an array of arguments.
"""
if self._generate_error_messages:
args = list(args) + ['error']
return ', '.join(str(a) for a in args)