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"""
Provides helper functionality specificially for Qt C++/QML code generators
"""
import qface.idl.domain as domain
from jinja2 import environmentfilter
from ..filters import upper_first
class Filters(object):
"""provides a set of filters to be used with the template engine"""
classPrefix = ''
@staticmethod
def className(symbol):
classPrefix = Filters.classPrefix
return '{0}{1}'.format(classPrefix, symbol.name)
@staticmethod
def defaultValue(symbol):
prefix = Filters.classPrefix
t = symbol.type # type: qface.domain.TypeSymbol
if t.is_primitive:
if t.is_int:
return 'int(0)'
if t.is_bool:
return 'bool(false)'
if t.is_string:
return 'QString()'
if t.is_real:
return 'qreal(0.0)'
if t.is_variant:
return 'QVariant()'
elif t.is_void:
return ''
elif t.is_enum:
module_name = upper_first(t.reference.module.module_name)
value = next(iter(t.reference.members))
return '{0}{1}Module::{2}'.format(prefix, module_name, value)
elif t.is_flag:
return '0'
elif symbol.type.is_list:
nested = Filters.returnType(symbol.type.nested)
return 'QVariantList()'.format(nested)
elif symbol.type.is_struct:
return '{0}{1}()'.format(prefix, symbol.type)
elif symbol.type.is_model:
nested = symbol.type.nested
if nested.is_primitive:
return 'new {0}VariantModel(this)'.format(prefix)
elif nested.is_complex:
return 'new {0}{1}Model(this)'.format(prefix, nested)
return 'XXX'
@staticmethod
def parameterType(symbol):
prefix = Filters.classPrefix
module_name = upper_first(symbol.module.module_name)
if symbol.type.is_enum:
return '{0}{1}Module::{2} {3}'.format(prefix, module_name, symbol.type, symbol)
if symbol.type.is_void or symbol.type.is_primitive:
if symbol.type.name == 'string':
return 'const QString &{0}'.format(symbol)
if symbol.type.name == 'var':
return 'const QVariant &{0}'.format(symbol)
if symbol.type.name == 'real':
return 'qreal {0}'.format(symbol)
return '{0} {1}'.format(symbol.type, symbol)
elif symbol.type.is_list:
nested = Filters.returnType(symbol.type.nested)
return 'const QVariantList &{1}'.format(nested, symbol)
elif symbol.type.is_model:
nested = symbol.type.nested
if nested.is_primitive:
return '{0}VariantModel *{1}'.format(prefix, symbol)
elif nested.is_complex:
return '{0}{1}Model *{2}'.format(prefix, nested, symbol)
else:
return 'const {0}{1} &{2}'.format(prefix, symbol.type, symbol)
return 'XXX'
@staticmethod
def returnType(symbol):
prefix = Filters.classPrefix
module_name = upper_first(symbol.module.module_name)
if symbol.type.is_enum:
return '{0}{1}Module::{2}'.format(prefix, module_name, symbol.type)
if symbol.type.is_void or symbol.type.is_primitive:
if symbol.type.name == 'string':
return 'QString'
if symbol.type.name == 'var':
return 'QVariant'
if symbol.type.name == 'real':
return 'qreal'
return symbol.type.name
elif symbol.type.is_list:
nested = Filters.returnType(symbol.type.nested)
return 'QVariantList'.format(nested)
elif symbol.type.is_model:
nested = symbol.type.nested
if nested.is_primitive:
return '{0}VariantModel *'.format(prefix)
elif nested.is_complex:
return '{0}{1}Model *'.format(prefix, nested)
else:
return '{0}{1}'.format(prefix, symbol.type)
return 'XXX'
@staticmethod
def open_ns(symbol):
''' generates a open namespace from symbol namespace x { y { z {'''
blocks = ['namespace {0} {{'.format(x) for x in symbol.module.name_parts]
return ' '.join(blocks)
@staticmethod
def close_ns(symbol):
'''generates a closing names statement from a symbol'''
return ' '.join(['}' for x in symbol.module.name_parts])
@staticmethod
def using_ns(symbol):
'''generates a using namespace x::y::z statement from a symbol'''
id = '::'.join(symbol.module.name_parts)
return 'using namespace {0};'.format(id)
@staticmethod
def ns(symbol):
'''generates a namespace x::y::z statement from a symbol'''
return '::'.join(symbol.module.name_parts)
@staticmethod
def signalName(s):
if isinstance(s, domain.Property):
return '{0}Changed'.format(s)
return s
@staticmethod
@environmentfilter
def parameters(env, s, filter=None, spaces=True):
if not filter:
filter = Filters.parameterType
elif isinstance(filter, str):
filter = env.filters[filter]
args = []
indent = ', '
if not spaces:
indent = ','
if isinstance(s, domain.Operation):
args = s.parameters
elif isinstance(s, domain.Signal):
args = s.parameters
elif isinstance(s, domain.Struct):
args = s.fields
elif isinstance(s, domain.Property):
args = [s]
return indent.join([filter(a) for a in args])
@staticmethod
@environmentfilter
def signature(env, s, expand=False, filter=None):
if not filter:
filter = Filters.returnType
elif isinstance(filter, str):
filter = env.filters[filter]
if isinstance(s, domain.Operation):
args = s.parameters
elif isinstance(s, domain.Signal):
args = s.parameters
elif isinstance(s, domain.Property):
args = [s] # for <property>Changed(<type>)
elif isinstance(s, domain.Struct):
args = s.fields
else:
args = []
if expand:
return ', '.join(['{0} {1}'.format(filter(a), a.name) for a in args])
return ','.join([filter(a) for a in args])
@staticmethod
def identifier(s):
return str(s).lower().replace('.', '_')
@staticmethod
def path(s):
return str(s).replace('.', '/')
@staticmethod
def get_filters():
return {
'defaultValue': Filters.defaultValue,
'returnType': Filters.returnType,
'parameterType': Filters.parameterType,
'open_ns': Filters.open_ns,
'close_ns': Filters.close_ns,
'using_ns': Filters.using_ns,
'ns': Filters.ns,
'signalName': Filters.signalName,
'parameters': Filters.parameters,
'signature': Filters.signature,
'identifier': Filters.identifier,
'path': Filters.path,
'className': Filters.className,
}
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