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@ -0,0 +1,86 @@ |
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# 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[:phrase] |
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PhraseClause.new(prefix, operator, clause[:phrase].map { |p| p[:term].to_s }.join(' ')) |
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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 |