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#
# Copyright 2011, edelight GmbH
#
# Authors:
# Markus Korn <markus.korn@edelight.de>
#
# 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.
#
require 'treetop'
require 'chef/solr_query/query_transform'
# mock QueryTransform such that we can access the location of the lucene grammar
class Chef
class SolrQuery
class QueryTransform
def self.base_path
class_variable_get(:@@base_path)
end
end
end
end
def build_flat_hash(hsh, prefix="")
result = {}
hsh.each_pair do |key, value|
if value.kind_of?(Hash)
result.merge!(build_flat_hash(value, "#{prefix}#{key}_"))
else
result[prefix+key] = value
end
end
result
end
module Lucene
class Term < Treetop::Runtime::SyntaxNode
# compares a query value and a value, tailing '*'-wildcards are handled correctly.
# Value can either be a string or an array, all other objects are converted
# to a string and than checked.
def match( value )
if value.is_a?(Array)
value.any?{ |x| self.match(x) }
else
File.fnmatch(self.text_value, value.to_s)
end
end
end
class Field < Treetop::Runtime::SyntaxNode
# simple field -> value matches, supporting tailing '*'-wildcards in keys
# as well as in values
def match( item )
keys = self.elements[0].match(item)
if keys.nil?
false
else
keys.any?{ |key| self.elements[1].match(item[key]) }
end
end
end
# we don't support range matches
# range of integers would be easy to implement
# but string ranges are hard
class FiledRange < Treetop::Runtime::SyntaxNode
end
class InclFieldRange < FieldRange
end
class ExclFieldRange < FieldRange
end
class RangeValue < Treetop::Runtime::SyntaxNode
end
class FieldName < Treetop::Runtime::SyntaxNode
def match( item )
if self.text_value.count("_") > 0
item.merge!(build_flat_hash(item))
end
if self.text_value.end_with?("*")
part = self.text_value.chomp("*")
item.keys.collect{ |key| key.start_with?(part)? key: nil}.compact
else
if item.has_key?(self.text_value)
[self.text_value,]
else
nil
end
end
end
end
class Body < Treetop::Runtime::SyntaxNode
def match( item )
self.elements[0].match( item )
end
end
class Group < Treetop::Runtime::SyntaxNode
def match( item )
self.elements[0].match(item)
end
end
class BinaryOp < Treetop::Runtime::SyntaxNode
def match( item )
self.elements[1].match(
self.elements[0].match(item),
self.elements[2].match(item)
)
end
end
class OrOperator < Treetop::Runtime::SyntaxNode
def match( cond1, cond2 )
cond1 or cond2
end
end
class AndOperator < Treetop::Runtime::SyntaxNode
def match( cond1, cond2 )
cond1 and cond2
end
end
# we don't support fuzzy string matching
class FuzzyOp < Treetop::Runtime::SyntaxNode
end
class BoostOp < Treetop::Runtime::SyntaxNode
end
class FuzzyParam < Treetop::Runtime::SyntaxNode
end
class UnaryOp < Treetop::Runtime::SyntaxNode
def match( item )
self.elements[0].match(
self.elements[1].match(item)
)
end
end
class NotOperator < Treetop::Runtime::SyntaxNode
def match( cond )
not cond
end
end
class RequiredOperator < Treetop::Runtime::SyntaxNode
end
class ProhibitedOperator < Treetop::Runtime::SyntaxNode
end
class Phrase < Treetop::Runtime::SyntaxNode
# a quoted ::Term
def match( value )
self.elements[0].match(value)
end
end
end
class Query
# initialize the parser by using the grammar shipped with chef
@@grammar = File.join(Chef::SolrQuery::QueryTransform.base_path, "lucene.treetop")
Treetop.load(@@grammar)
@@parser = LuceneParser.new
def self.parse(data)
# parse the query into a query tree
if data.nil?
data = "*:*"
end
tree = @@parser.parse(data)
if tree.nil?
msg = "Parse error at offset: #{@@parser.index}\n"
msg += "Reason: #{@@parser.failure_reason}"
raise "Query #{data} is not supported: #{msg}"
end
self.clean_tree(tree)
tree
end
private
def self.clean_tree(root_node)
# remove all SyntaxNode elements from the tree, we don't need them as
# the related ruby class already knowns what to do.
return if root_node.elements.nil?
root_node.elements.delete_if do |node|
node.class.name == "Treetop::Runtime::SyntaxNode"
end
root_node.elements.each { |node| self.clean_tree(node) }
end
end
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