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Contents
module Alf
module Support
NOT_PROVIDED = Object.new.freeze
# Converts `value` to a lispy expression.
#
# Example:
#
# expr = Alf.examples.compile{
# project(:suppliers, [:name])
# }
# Support.to_lispy(expr)
# # => project(:suppliers, [:name])
#
# @param [Object] expr any ruby object denoting a lispy expression
# @return [String] a lispy expression for `value`
def to_lispy(expr, default = NOT_PROVIDED)
ToLispy.apply(expr)
rescue NotSupportedError
raise if default == NOT_PROVIDED
default
end
# Myrrha rules for converting to ruby literals
ToLispy = Myrrha::coercions do |r|
# Delegate to #to_lispy if it exists
lispy_able = lambda{|v,rd| v.respond_to?(:to_lispy)}
r.upon(lispy_able) do |v,rd|
v.to_lispy
end
# Let's assume to to_ruby_literal will make the job
r.fallback(Object) do |v, _|
Support.to_ruby_literal(v) rescue v.inspect
end
end # ToLispy
end # module Support
end # module Alf
Version data entries
5 entries across 5 versions & 1 rubygems