common/__init__.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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"""Common subpackage of cubicweb : defines library functions used both on the
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hg stserver side and on the client side
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:organization: Logilab
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:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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from logilab.common.adbh import FunctionDescr
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from cubicweb._exceptions import * # bw compat
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from rql.utils import register_function, iter_funcnode_variables
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class COMMA_JOIN(FunctionDescr):
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    supported_backends = ('postgres', 'sqlite',)
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    rtype = 'String'
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    @classmethod
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    def st_description(cls, funcnode):
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        return ', '.join(term.get_description()
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                         for term in iter_funcnode_variables(funcnode))
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register_function(COMMA_JOIN)  # XXX do not expose?
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class CONCAT_STRINGS(COMMA_JOIN):
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    aggregat = True
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register_function(CONCAT_STRINGS) # XXX bw compat
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class GROUP_CONCAT(CONCAT_STRINGS):
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    supported_backends = ('mysql', 'postgres', 'sqlite',)
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register_function(GROUP_CONCAT)
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class LIMIT_SIZE(FunctionDescr):
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    supported_backends = ('postgres', 'sqlite',)
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    rtype = 'String'
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    @classmethod
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    def st_description(cls, funcnode):
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        return funcnode.children[0].get_description()
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register_function(LIMIT_SIZE)
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class TEXT_LIMIT_SIZE(LIMIT_SIZE):
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    supported_backends = ('mysql', 'postgres', 'sqlite',)
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register_function(TEXT_LIMIT_SIZE)