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terms.py
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Wed, Jan 1, 08:41

terms.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2014, 2015 CERN.
#
# Invenio is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# Invenio is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""Implement AST vistor."""
from invenio_query_parser.ast import (
AndOp, KeywordOp, OrOp,
NotOp, Keyword, Value,
SingleQuotedValue,
DoubleQuotedValue,
RegexValue, RangeOp,
ValueQuery, EmptyQuery
)
from invenio_query_parser.visitor import make_visitor
class Terms(object):
"""Implement visitor to get all given terms."""
visitor = make_visitor()
def __init__(self, keywords=None):
"""Initialize list of keywords operators."""
self.keywords = keywords
# pylint: disable=W0613,E0102
@visitor(AndOp)
def visit(self, node, left, right):
return left + right
@visitor(OrOp)
def visit(self, node, left, right):
return left + right
@visitor(NotOp)
def visit(self, node, op):
return []
@visitor(KeywordOp)
def visit(self, node, left, right):
return right if left else []
@visitor(ValueQuery)
def visit(self, node, op):
return map(lambda p: p.strip('%'), op)
@visitor(Keyword)
def visit(self, node):
return self.keywords is None or node.value in self.keywords
@visitor(Value)
def visit(self, node):
return [node.value.strip('%')]
@visitor(SingleQuotedValue)
def visit(self, node):
return [node.value]
@visitor(DoubleQuotedValue)
def visit(self, node):
return [node.value]
@visitor(RegexValue)
def visit(self, node):
return [node.value]
@visitor(RangeOp)
def visit(self, node, left, right):
return ["%s->%s" % (left, right)]
@visitor(EmptyQuery)
def visit(self, node):
return []
# pylint: enable=W0612,E0102

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