70 lines
2.2 KiB
Ruby
70 lines
2.2 KiB
Ruby
class Quantity < ActiveRecord::Base
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require 'ripper'
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enum domain: {
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diet: 0,
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measurement: 1,
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exercise: 2
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}
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acts_as_nested_set dependent: :destroy, scope: :project
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belongs_to :project, required: false
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validates :name, presence: true, uniqueness: {scope: :project_id}
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validates :domain, inclusion: {in: domains.keys}
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validate if: -> { parent.present? } do
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errors.add(:parent, :parent_domain_mismatch) unless domain == parent.domain
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end
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validate if: -> { formula.present? } do
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# 1st: check if formula is valid Ruby code
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tokenized_length = Ripper.tokenize(formula).join.length
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unless tokenized_length == formula.length
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errors.add(:formula, :invalid_formula, {part: formula[0...tokenized_length]})
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end
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# 2nd: check if formula contains only allowed token types
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identifiers = []
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Ripper.lex(formula).each do |location, ttype, token|
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case
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when [:on_ident, :on_tstring_content, :on_const].include?(ttype)
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identifiers << token
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when [:on_sp, :on_int, :on_rational, :on_float, :on_tstring_beg, :on_tstring_end,
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:on_lparen, :on_rparen].include?(ttype)
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when :on_op == ttype && '+-*/'.include?(token)
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else
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errors.add(:formula, :disallowed_token,
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{token: token, ttype: ttype, location: location})
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end
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end
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# 3rd: check for disallowed function calls (they are not detected by Ripper.lex)
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# FIXME: this is unreliable (?) detection of function calls, should be replaced
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# with parsing Ripper.sexp if necessary
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function = Ripper.slice(formula, 'ident [sp]* lparen')
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errors.add(:formula, :disallowed_function_call, {function: function}) if function
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# 4th: check if identifiers used in formula correspond to existing quantities
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identifiers.uniq!
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quantities = self.project.quantities.where(name: identifiers).pluck(:name)
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if quantities.length != identifiers.length
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errors.add(:formula, :unknown_quantity, {quantities: identifiers - quantities})
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end
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end
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after_initialize do
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if new_record?
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self.primary = false if self.primary.nil?
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end
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end
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def toggle_primary!
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self.toggle!(:primary)
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end
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def formula_quantities
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end
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def calculate(inputs)
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end
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end
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