Class: NanDoc::Filters::CustomTag::TagParser::Seq

Inherits:
Object
  • Object
show all
Includes:
ParserSymbol
Defined in:
lib/nandoc/filters/tag-parser.rb

Overview

concatentation production

Instance Method Summary collapse

Methods included from ParserSymbol

#secret_grammar

Constructor Details

#initialize(grammar, arr) ⇒ Seq

Returns a new instance of Seq.



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# File 'lib/nandoc/filters/tag-parser.rb', line 157

def initialize grammar, arr
  secret_grammar grammar
  @arr = arr
  @parsers = Array.new(arr.size)
  @done = false
end

Instance Method Details

#get_parser_at(offset) ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 163

def get_parser_at offset
  @parsers[offset] ||= begin
    def_thing = @arr[offset]
    sym = nil
    if def_thing
      sym = grammar.get_symbol(def_thing)
    end
    sym
  end
end

#parse(scn, sex, fails) ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 173

def parse scn, sex, fails
  my_ret = nil
  current = 0
  last = @arr.size - 1
  sym = get_parser_at(current)
  while sym
    puts "sequence at #{current} about to parse #{scn.rest.inspect}"
    ch_ret = sym.parse(scn, sex, fails)
    if ch_ret.kind_of?(ParserSymbol)
      sym = ch_ret
    elsif ch_ret == false
      sym = false
      my_ret = false
      break
    elsif ch_ret == true
      current += 1
      sym = get_parser_at(current)
    else
      fail("don't know what to do with this: #{ch_ret.inspect}")
    end
  end
  if my_ret.nil?
    if current <= last
      fail("what happened?")
    else
      my_ret = true
    end
  end
  my_ret
end