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Contents
# frozen_string_literal: true
require "dry/core/equalizer"
require "dry/logic/operators"
module Dry
module Schema
# Predicate objects used within the DSL
#
# @api public
class Predicate
# A negated predicate
#
# @api private
class Negation
include Dry::Logic::Operators
# @api private
attr_reader :predicate
# @api private
def initialize(predicate)
@predicate = predicate
end
# Dump negated predicate to an AST
#
# @return [Array]
#
# @api private
def to_ast(...)
[:not, predicate.to_ast(...)]
end
alias_method :ast, :to_ast
end
include Dry::Logic::Operators
include Dry::Equalizer(:name, :args, :block)
# @api private
attr_reader :compiler
# @api private
attr_reader :name
# @api private
attr_reader :args
# @api private
attr_reader :block
# @api private
def initialize(compiler, name, args, block)
@compiler = compiler
@name = name
@args = args
@block = block
end
# Negate a predicate
#
# @example
# required(:name).value(:string) { !empty? }
#
# @return [Negation]
#
# @api public
def !
Negation.new(self)
end
# @api private
def ensure_valid
if compiler.predicates[name].arity - 1 != args.size
raise ArgumentError, "#{name} predicate arity is invalid"
end
end
# Compile predicate to a rule object
#
# @api private
def to_rule
compiler.visit(to_ast)
end
# Dump predicate to an AST
#
# @return [Array]
#
# @api private
def to_ast(*)
[:predicate, [name, compiler.predicates.arg_list(name, *args)]]
end
alias_method :ast, :to_ast
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems