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#
# Author:: Seth Falcon (<seth@opscode.com>)
# Copyright:: Copyright (c) 2010-2011 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
grammar Lucene
rule body
(expression / space)* <Body>
end
rule expression
operation / group / field / field_range / term / string
end
rule term
keyword valid_letter+ <Term> / !keyword !"?" valid_letter <Term>
end
rule field
field_name ":" (term/string/group) <Field>
end
rule field_range
field_name ":" "[" range_value " TO " range_value "]" <InclFieldRange>
/
field_name ":" "{" range_value " TO " range_value "}" <ExclFieldRange>
end
rule field_name
!keyword valid_letter+ <FieldName>
end
rule range_value
valid_letter+ <RangeValue> / "*" <RangeValue>
end
rule group
space? '(' body ')' space? <Group>
end
rule operation
binary_op / unary_op / fuzzy_op / boost_op
end
rule unary_op
not_op / required_op / prohibited_op
end
rule binary_op
(group / field / field_range / term) space? boolean_operator space+ body <BinaryOp>
end
rule boolean_operator
and_operator / or_operator
end
rule and_operator
'AND' <AndOperator> / '&&' <AndOperator>
end
rule or_operator
'OR' <OrOperator> / '||' <OrOperator>
end
rule not_op
not_operator space (group / field / field_range / term / string) <UnaryOp>
/
bang_operator space? (group / field / field_range / term / string) <UnaryOp>
end
rule not_operator
'NOT' <NotOperator>
end
rule bang_operator
'!' <NotOperator>
end
rule required_op
!valid_letter required_operator (term/string) <UnaryOp>
/
required_operator (term/string) <UnaryOp>
end
rule required_operator
'+' <RequiredOperator>
end
rule prohibited_op
!valid_letter prohibited_operator (field/field_range/term/string) <UnaryOp>
end
rule prohibited_operator
'-' <ProhibitedOperator>
end
rule boost_op
(term/string) '^' fuzzy_param <BoostOp>
end
rule fuzzy_op
(term/string) '~' fuzzy_param? (space / !valid_letter) <FuzzyOp>
end
rule fuzzy_param
[0-9] '.'? [0-9] <FuzzyParam> / [0-9]+ <FuzzyParam>
end
rule string
'"' term (space term)* '"' <Phrase>
end
rule keyword
'AND' / 'OR' / 'NOT'
end
rule valid_letter
start_letter+ ([a-zA-Z0-9@*?_.-] / '\\' special_char)*
end
rule start_letter
[a-zA-Z0-9@._*] / '\\' special_char
end
rule end_letter
[a-zA-Z0-9*?_.] / '\\' special_char
end
rule special_char
[-+&|!(){}\[\]^"~*?:\\]
end
rule space
[\s]+
end
end
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