74 lines
1.7 KiB
Ruby
74 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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require "dice"
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class DiceRoller
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attr_reader :dice
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attr_reader :result
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def initialize(roll_command, stat: nil)
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@roll_command = roll_command
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@stat = stat&.value
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@dice = []
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end
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def roll
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roll_command = parse_roll_command_references(roll_command)
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Dice.roll(roll_command)
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end
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def valid?
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return if @roll_command.blank?
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# No repeated math operators
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return false if @roll_command.match?(/[+\-*\/]{2,}/)
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# No leading or trailing math operators
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return false if @roll_command.match?(/\A[+\-*\/]/) || @roll_command.match?(/[+\-*\/]\z/)
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@roll_command.match?(
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/
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\A(
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(\d*d\d*) |
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([+\-*\/]) |
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(\d+) |
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(self)
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)*\z/xi,
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)
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end
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private
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def roll_delimiters
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[ "+", "-", "*", "/" ]
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end
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def roll_dice(command)
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parts = command.downcase.split("d").compact_blank
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die_type = parts.last
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dice_number = parts.length > 1 ? parts.first.to_i : 1
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result = 0
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dice_number.times do
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roll = rand(1..die_type.to_i)
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result += roll
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dice << [ die_type, result ]
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end
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result
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end
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def parse_roll_command_references(roll_command)
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roll_command = @roll_command.include?("self") ? @roll_command.gsub("self", @stat.to_s) : @roll_command
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roll_command.split(Regexp.union(roll_delimiters)).each do |part|
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next if part.match?(/\A\d*\z/)
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next if part.match?(/\A\d*d\d*\z/)
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value = CharacterSheetFeature.find_by(slug: part).featurable.value
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raise "#{part} not found" if value.blank?
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roll_command.gsub!(part, value.to_s)
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end
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roll_command
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end
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end
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