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# frozen_string_literal: true # CSV Decision: CSV based Ruby decision tables. # Created December 2017. # @author Brett Vickers <brett@phillips-vickers.com> # See LICENSE and README.md for details. module CSVDecision # Methods to assign a matcher to data cells. # @api private class Matchers # Recognise numeric comparison expressions - e.g., +> 100+ or +!= 0+. class Numeric < Matcher # For example: +>= 100+ or +!= 0+. COMPARISON = /\A(?<comparator><=|>=|<|>|!=)\s*(?<value>\S.*)\z/ private_constant :COMPARISON # Coerce the input value to a numeric representation before invoking the comparison. # If the coercion fails, it will produce a nil value which always fails to match. COMPARATORS = { '>' => proc { |numeric_cell, value| Matchers.numeric(value)&.> numeric_cell }, '>=' => proc { |numeric_cell, value| Matchers.numeric(value)&.>= numeric_cell }, '<' => proc { |numeric_cell, value| Matchers.numeric(value)&.< numeric_cell }, '<=' => proc { |numeric_cell, value| Matchers.numeric(value)&.<= numeric_cell }, '!=' => proc { |numeric_cell, value| Matchers.numeric(value)&.!= numeric_cell } }.freeze private_constant :COMPARATORS # (see Matcher#matches?) def self.matches?(cell) match = COMPARISON.match(cell) return false unless match numeric_cell = Matchers.to_numeric(match['value']) return false unless numeric_cell comparator = match['comparator'] Matchers::Proc.new(type: :proc, function: COMPARATORS[comparator].curry[numeric_cell].freeze) end # (see Matcher#matches?) def matches?(cell) Numeric.matches?(cell) end end end end
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