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

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

Defined Under Namespace

Modules: ParserSymbol Classes: EndSymbolClass, Or, RegexpSymbol, Seq

Constant Summary collapse

EndSymbol = 
EndSymbolClass.new

Instance Method Summary collapse

Constructor Details

#initialize ⇒ TagParser

treetop?



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# File 'lib/nandoc/filters/tag-parser.rb', line 7

def initialize
  @last_failure_lines = nil
end

Instance Method Details

#failure_lines(*ignored) ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 10

def failure_lines *ignored
  @last_failure_lines
end

#get_start_symbol ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 38

def get_start_symbol
  get_symbol(:start)
end

#get_symbol(mixed) ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 13

def get_symbol mixed
  if mixed.kind_of?(ParserSymbol)
    mixed
  elsif :start == mixed
    name = symbols[:start]
    sym = get_symbol_with_name(name)
  elsif :end == mixed
    sym = EndSymbol
  elsif mixed.kind_of?(Array)
    sym = Seq.new(self, mixed)
  else
    sym = get_symbol_with_name(mixed)
  end
  sym
end

#get_symbol_with_name(name) ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 28

def get_symbol_with_name name
  thing = symbols[name] or fail("Symbol not found: #{name.inspect}")
  sym = case thing
    when Hash
      RegexpSymbol.new(self, thing, name)
    else
      fail("no: #{thing.inspect}")
  end
  sym
end

#parse(str) ⇒ Object

return tree or (nil and set failure lines)



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# File 'lib/nandoc/filters/tag-parser.rb', line 42

def parse str
  sym = get_start_symbol
  scn = StringScanner.new(str)
  sex = []
  fails = []
  ok = true
  while sym
    ch_ret = sym.parse(scn, sex, fails)
    case ch_ret
    when ParserSymbol
      sym = ch_ret
    when false;
      ok = false
      break
    when true;
      ok = true
      break
    else
      debugger; 'x'
    end
  end
  if ok
    sex
  else
    @last_failure_lines = fails
    nil
  end
end

#symbols ⇒ Object 



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# File 'lib/nandoc/filters/tag-parser.rb', line 70

def symbols
  @symbols ||= begin
    self.class.const_get(:Symbols) or
      fail("Symbols constant not found in #{self.class}")
  end
end