Method: ERB::Util.tokenize

Defined in:
activesupport/lib/active_support/core_ext/erb/util.rb

.tokenize(source) ⇒ Object

Tokenizes a line of ERB. This is really just for error reporting and nobody should use it.



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# File 'activesupport/lib/active_support/core_ext/erb/util.rb', line 161

def self.tokenize(source) # :nodoc:
  require "strscan"
  source = StringScanner.new(source.chomp)
  tokens = []

  start_re = /<%(?:={1,2}|-|\#|%)?/m
  finish_re = /(?:[-=])?%>/m

  while !source.eos?
    pos = source.pos
    source.scan_until(/(?:#{start_re}|#{finish_re})/)
    raise NotImplementedError if source.matched.nil?
    len = source.pos - source.matched.bytesize - pos

    case source.matched
    when start_re
      tokens << [:TEXT, source.string[pos, len]] if len > 0
      tokens << [:OPEN, source.matched]
      if source.scan(/(.*?)(?=#{finish_re}|\z)/m)
        tokens << [:CODE, source.matched] unless source.matched.empty?
        tokens << [:CLOSE, source.scan(finish_re)] unless source.eos?
      else
        raise NotImplementedError
      end
    when finish_re
      tokens << [:CODE, source.string[pos, len]] if len > 0
      tokens << [:CLOSE, source.matched]
    else
      raise NotImplementedError, source.matched
    end

    unless source.eos? || source.exist?(start_re) || source.exist?(finish_re)
      tokens << [:TEXT, source.rest]
      source.terminate
    end
  end

  tokens
end