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88 lines
2.4 KiB
88 lines
2.4 KiB
# frozen_string_literal: true
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class SearchQueryTransformer < Parslet::Transform
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class Query
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attr_reader :should_clauses, :must_not_clauses, :must_clauses
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def initialize(clauses)
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grouped = clauses.chunk(&:operator).to_h
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@should_clauses = grouped.fetch(:should, [])
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@must_not_clauses = grouped.fetch(:must_not, [])
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@must_clauses = grouped.fetch(:must, [])
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end
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def apply(search)
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should_clauses.each { |clause| search = search.query.should(clause_to_query(clause)) }
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must_clauses.each { |clause| search = search.query.must(clause_to_query(clause)) }
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must_not_clauses.each { |clause| search = search.query.must_not(clause_to_query(clause)) }
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search.query.minimum_should_match(1)
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end
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private
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def clause_to_query(clause)
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case clause
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when TermClause
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{ multi_match: { type: 'most_fields', query: clause.term, fields: ['text', 'text.stemmed'] } }
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when PhraseClause
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{ match_phrase: { text: { query: clause.phrase } } }
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else
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raise "Unexpected clause type: #{clause}"
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end
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end
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end
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class Operator
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class << self
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def symbol(str)
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case str
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when '+'
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:must
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when '-'
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:must_not
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when nil
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:should
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else
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raise "Unknown operator: #{str}"
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end
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end
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end
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end
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class TermClause
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attr_reader :prefix, :operator, :term
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def initialize(prefix, operator, term)
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@prefix = prefix
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@operator = Operator.symbol(operator)
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@term = term
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end
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end
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class PhraseClause
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attr_reader :prefix, :operator, :phrase
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def initialize(prefix, operator, phrase)
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@prefix = prefix
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@operator = Operator.symbol(operator)
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@phrase = phrase
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end
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end
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rule(clause: subtree(:clause)) do
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prefix = clause[:prefix][:term].to_s if clause[:prefix]
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operator = clause[:operator]&.to_s
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if clause[:term]
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TermClause.new(prefix, operator, clause[:term].to_s)
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elsif clause[:shortcode]
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TermClause.new(prefix, operator, ":#{clause[:term]}:")
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elsif clause[:phrase]
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PhraseClause.new(prefix, operator, clause[:phrase].is_a?(Array) ? clause[:phrase].map { |p| p[:term].to_s }.join(' ') : clause[:phrase].to_s)
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else
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raise "Unexpected clause type: #{clause}"
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end
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end
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rule(query: sequence(:clauses)) { Query.new(clauses) }
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end
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