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require 'mustermann/ast/pattern'
module Mustermann
# Express style pattern implementation.
#
# @example
# Mustermann.new('/:foo', type: :express) === '/bar' # => true
#
# @see Mustermann::Pattern
# @see file:README.md#flask Syntax description in the README
class Express < AST::Pattern
register :express
on(nil, ??, ?+, ?*, ?)) { |c| unexpected(c) }
on(?:) { |c| node(:capture) { scan(/\w+/) } }
on(?() { |c| node(:splat, constraint: read_brackets(?(, ?))) }
suffix ??, after: :capture do |char, element|
unexpected(char) unless element.is_a? :capture
node(:optional, element)
end
suffix ?*, after: :capture do |match, element|
node(:named_splat, element.name)
end
suffix ?+, after: :capture do |match, element|
node(:named_splat, element.name, constraint: ".+")
end
suffix ?(, after: :capture do |match, element|
element.constraint = read_brackets(?(, ?))
element
end
end
end
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