Sha256: 8dc78dac8f9465a5f6a62aa057ae97fbadd5b111efe8895ac824d46938dc3793
Contents?: true
Size: 947 Bytes
Versions: 7347
Compression:
Stored size: 947 Bytes
Contents
module AST
# This simple module is very useful in the cases where one needs
# to define deeply nested ASTs from Ruby code, for example, in
# tests. It should be used like this:
#
# describe YourLanguage::AST do
# include Sexp
#
# it "should correctly parse expressions" do
# YourLanguage.parse("1 + 2 * 3").should ==
# s(:add,
# s(:integer, 1),
# s(:multiply,
# s(:integer, 2),
# s(:integer, 3)))
# end
# end
#
# This way the amount of boilerplate code is greatly reduced.
module Sexp
# Creates a {Node} with type `type` and children `children`.
# Note that the resulting node is of the type AST::Node and not a
# subclass.
# This would not pose a problem with comparisons, as {Node#==}
# ignores metadata.
def s(type, *children)
Node.new(type, children)
end
end
end
Version data entries
7,347 entries across 7,338 versions & 56 rubygems