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require 'mustermann/ast/pattern'
module Mustermann
# Pyramid style pattern implementation.
#
# @example
# Mustermann.new('/<foo>', type: :pryamid) === '/bar' # => true
#
# @see Mustermann::Pattern
# @see file:README.md#pryamid Syntax description in the README
class Pyramid < AST::Pattern
register :pyramid
on(nil, ?}) { |c| unexpected(c) }
on(?{) do |char|
name = expect(/\w+/, char: char)
constraint = read_brackets(?{, ?}) if scan(?:)
expect(?}) unless constraint
node(:capture, name, constraint: constraint)
end
on(?*) do |char|
node(:named_splat, expect(/\w+$/, char: char), convert: -> e { e.split(?/) })
end
end
end
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