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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
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6,755 entries across 6,746 versions & 52 rubygems