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# frozen_string_literal: true
require "strscan"
module ActionDispatch
module Journey # :nodoc:
class Scanner # :nodoc:
def initialize
@ss = nil
end
def scan_setup(str)
@ss = StringScanner.new(str)
end
def eos?
@ss.eos?
end
def pos
@ss.pos
end
def pre_match
@ss.pre_match
end
def next_token
return if @ss.eos?
until token = scan || @ss.eos?; end
token
end
private
# takes advantage of String @- deduping capabilities in Ruby 2.5 upwards
# see: https://bugs.ruby-lang.org/issues/13077
def dedup_scan(regex)
r = @ss.scan(regex)
r ? -r : nil
end
def scan
case
# /
when @ss.skip(/\//)
[:SLASH, "/"]
when @ss.skip(/\(/)
[:LPAREN, "("]
when @ss.skip(/\)/)
[:RPAREN, ")"]
when @ss.skip(/\|/)
[:OR, "|"]
when @ss.skip(/\./)
[:DOT, "."]
when text = dedup_scan(/:\w+/)
[:SYMBOL, text]
when text = dedup_scan(/\*\w+/)
[:STAR, text]
when text = @ss.scan(/(?:[\w%\-~!$&'*+,;=@]|\\[:()])+/)
text.tr! "\\", ""
[:LITERAL, -text]
# any char
when text = dedup_scan(/./)
[:LITERAL, text]
end
end
end
end
end
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