142 lines
3 KiB
Ruby
142 lines
3 KiB
Ruby
module Mutant
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class Matcher
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# Builder for complex matchers
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class Builder
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include NodeHelpers, Concord.new(:cache)
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# Initalize object
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#
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# @param [Cache] cache
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#
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# @return [undefined]
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#
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# @api private
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#
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def initialize(cache)
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super
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@matchers = []
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@subject_ignores = []
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@subject_selectors = []
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end
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# Add a subject ignore
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#
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# @param [Expression] expression
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#
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# @return [self]
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#
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# @api private
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#
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def add_subject_ignore(expression)
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@subject_ignores << expression.matcher(cache)
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self
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end
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# Add a subject selector
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#
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# @param [#call] selector
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#
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# @return [self]
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#
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# @api private
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#
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def add_subject_selector(selector)
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@subject_selectors << selector
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self
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end
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# Add a match expression
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#
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# @param [Expression] expression
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#
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# @return [self]
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#
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# @api private
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#
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def add_match_expression(expression)
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@matchers << expression.matcher(cache)
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self
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end
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# Return generated matcher
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#
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# @return [Mutant::Matcher]
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#
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# @api private
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#
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def matcher
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if @matchers.empty?
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return Matcher::Null.new
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end
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matcher = Matcher::Chain.build(@matchers)
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if predicate
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Matcher::Filter.new(matcher, predicate)
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else
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matcher
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end
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end
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private
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# Return subject selector
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#
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# @return [#call]
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# if selector is present
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#
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# @return [nil]
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# otherwise
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#
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# @api private
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#
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def subject_selector
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Morpher::Evaluator::Predicate::Boolean::Or.new(@subject_selectors) if @subject_selectors.any?
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end
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# Return predicate
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#
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# @return [#call]
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# if filter is needed
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#
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# @return [nil]
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# othrwise
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#
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# @api private
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#
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def predicate
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if subject_selector && subject_rejector
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Morpher::Evaluator::Predicate::Boolean::And.new([
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subject_selector,
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Morpher::Evaluator::Predicate::Negation.new(subject_rejector)
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])
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elsif subject_selector
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subject_selector
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elsif subject_rejector
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Morpher::Evaluator::Predicate::Negation.new(subject_rejector)
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else
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nil
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end
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end
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# Return subject rejector
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#
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# @return [#call]
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# if there is a subject rejector
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#
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# @return [nil]
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# otherwise
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#
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# @api private
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#
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def subject_rejector
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rejectors = @subject_ignores.flat_map(&:to_a).map do |subject|
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Morpher.compile(s(:eql, s(:attribute, :identification), s(:static, subject.identification)))
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end
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Morpher::Evaluator::Predicate::Boolean::Or.new(rejectors) if rejectors.any?
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end
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end # Builder
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end # Matcher
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end # Mutant
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