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# frozen_string_literal: true
##
# The {Ryo::Keywords Ryo::Keywords} module implements Ryo equivalents
# to some of JavaScript's keywords - for example: the **in** and **delete**
# operators. The instance methods of this module are available as singleton
# methods on the {Ryo} module.
module Ryo::Keywords
##
# @example
# point = Ryo(x: 0, y: 0, print: Ryo.fn { print x, y, "\n" })
# point.print.()
#
# @param [Proc] b
# The function's body.
#
# @return [Ryo::Function]
# Returns a Ryo function.
#
# @see Ryo::Function Ryo::Function
def fn(&b)
Ryo::Function.new(&b)
end
alias_method :function, :fn
##
# Equivalent to JavaScript's **in** operator.
#
# @param [<Ryo::Object, Ryo::BasicObject>] ryo
# A Ryo object.
#
# @param [<String, #to_s>] property
# A property name.
#
# @return [Boolean]
# Returns true when **property** is a member of **ryo**, or its prototype chain.
def in?(ryo, property)
return false unless ryo
property?(ryo, property) || in?(prototype_of(ryo), property)
end
##
# The {#delete} method deletes a property from a Ryo object.
# More or less equivalent to JavaScript's "delete" operator.
#
# @note
# This method does not delete properties from the prototype(s)
# of a Ryo object. <br>
# For that - see {Ryo::Reflect#delete! Ryo::Reflect#delete!}.
#
# @param [<Ryo::Object, Ryo::BasicObject>] ryo
# A Ryo object.
#
# @param [<String, #to_s>] property
# A property name.
#
# @return [void]
def delete(ryo, property)
property = property.to_s
if property?(ryo, property)
table_of(ryo).delete(property)
else
return if getter_defined?(ryo, property)
define_method!(ryo, property) { ryo[property] }
end
end
end
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