Module: Heist::Scheme

Includes:
Treetop::Runtime
Included in:
SchemeParser
Defined in:
lib/parser/nodes.rb,
lib/parser/scheme.rb

Overview

:nodoc:

Defined Under Namespace

Modules: Boolean0, Cell0, Cell1, Cells0, Cells1, Cells2, Character0, Comment0, Comment1, Complex0, Datum0, Datum1, Identifier, Identifier0, Identifier1, Identifier2, Identifier3, Ignore0, Ignore1, Integer0, Integer1, List, List0, List1, Program0, Rational0, Real0, Real1, Shebang0, Shebang1, String0, Vector, Vector0, Vector1 Classes: Boolean, Cell, Character, Complex, Datum, Integer, Program, QuotedCell, Rational, Real, String

Constant Summary collapse

SHORTHANDS =

Any list-generating shorthands present in the grammar should be listed here. In Scheme, this list includes the various quoting symbols that can be used as shorthands for calling quoting functions.

{
  "'"   => :quote,
  "`"   => :quasiquote,
  ","   => :unquote,
  ",@"  => :'unquote-splicing'
}

Instance Method Summary collapse

Instance Method Details

#_nt_atom ⇒ Object 



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# File 'lib/parser/scheme.rb', line 712

def _nt_atom
  start_index = index
  if node_cache[:atom].has_key?(index)
    cached = node_cache[:atom][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_datum
  if r1
    r0 = r1
  else
    r2 = _nt_identifier
    if r2
      r0 = r2
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:atom][start_index] = r0

  return r0
end

#_nt_boolean ⇒ Object 



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# File 'lib/parser/scheme.rb', line 835

def _nt_boolean
  start_index = index
  if node_cache[:boolean].has_key?(index)
    cached = node_cache[:boolean][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_hash
  s0 << r1
  if r1
    if input.index(Regexp.new('[tf]'), index) == index
      r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      r2 = nil
    end
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(Boolean,input, i0...index, s0)
    r0.extend(Boolean0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:boolean][start_index] = r0

  return r0
end

#_nt_cell ⇒ Object 



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# File 'lib/parser/scheme.rb', line 171

def _nt_cell
  start_index = index
  if node_cache[:cell].has_key?(index)
    cached = node_cache[:cell][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_ignore
  s1 << r2
  if r2
    r3 = _nt_quote
    s1 << r3
    if r3
      r4 = _nt_cell
      s1 << r4
    end
  end
  if s1.last
    r1 = instantiate_node(QuotedCell,input, i1...index, s1)
    r1.extend(Cell0)
  else
    self.index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    i5, s5 = index, []
    r6 = _nt_ignore
    s5 << r6
    if r6
      i7 = index
      r8 = _nt_list
      if r8
        r7 = r8
      else
        r9 = _nt_vector
        if r9
          r7 = r9
        else
          r10 = _nt_atom
          if r10
            r7 = r10
          else
            self.index = i7
            r7 = nil
          end
        end
      end
      s5 << r7
      if r7
        r11 = _nt_ignore
        s5 << r11
      end
    end
    if s5.last
      r5 = instantiate_node(Cell,input, i5...index, s5)
      r5.extend(Cell1)
    else
      self.index = i5
      r5 = nil
    end
    if r5
      r0 = r5
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:cell][start_index] = r0

  return r0
end

#_nt_cells ⇒ Object 



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# File 'lib/parser/scheme.rb', line 476

def _nt_cells
  start_index = index
  if node_cache[:cells].has_key?(index)
    cached = node_cache[:cells][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  s2, i2 = [], index
  loop do
    r3 = _nt_cell
    if r3
      s2 << r3
    else
      break
    end
  end
  if s2.empty?
    self.index = i2
    r2 = nil
  else
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
  end
  s1 << r2
  if r2
    i4, s4 = index, []
    r5 = _nt_dot
    s4 << r5
    if r5
      r6 = _nt_space
      s4 << r6
      if r6
        r7 = _nt_cell
        s4 << r7
      end
    end
    if s4.last
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      r4.extend(Cells0)
    else
      self.index = i4
      r4 = nil
    end
    s1 << r4
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(Cells1)
  else
    self.index = i1
    r1 = nil
  end
  if r1
    r0 = r1
  else
    i8, s8 = index, []
    s9, i9 = [], index
    loop do
      r10 = _nt_cell
      if r10
        s9 << r10
      else
        break
      end
    end
    r9 = instantiate_node(SyntaxNode,input, i9...index, s9)
    s8 << r9
    if r9
      r11 = _nt_ignore
      s8 << r11
    end
    if s8.last
      r8 = instantiate_node(SyntaxNode,input, i8...index, s8)
      r8.extend(Cells2)
    else
      self.index = i8
      r8 = nil
    end
    if r8
      r0 = r8
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:cells][start_index] = r0

  return r0
end

#_nt_character ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1203

def _nt_character
  start_index = index
  if node_cache[:character].has_key?(index)
    cached = node_cache[:character][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if input.index("#\\", index) == index
    r1 = instantiate_node(SyntaxNode,input, index...(index + 2))
    @index += 2
  else
    terminal_parse_failure("#\\")
    r1 = nil
  end
  s0 << r1
  if r1
    i2 = index
    r3 = _nt_identifier
    if r3
      r2 = r3
    else
      if index < input_length
        r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("any character")
        r4 = nil
      end
      if r4
        r2 = r4
      else
        self.index = i2
        r2 = nil
      end
    end
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(Character,input, i0...index, s0)
    r0.extend(Character0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:character][start_index] = r0

  return r0
end

#_nt_comment ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1678

def _nt_comment
  start_index = index
  if node_cache[:comment].has_key?(index)
    cached = node_cache[:comment][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if input.index(";", index) == index
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure(";")
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3, s3 = index, []
      i4 = index
      if input.index(Regexp.new('[\\n\\r]'), index) == index
        r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        r5 = nil
      end
      if r5
        r4 = nil
      else
        self.index = i4
        r4 = instantiate_node(SyntaxNode,input, index...index)
      end
      s3 << r4
      if r4
        if index < input_length
          r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("any character")
          r6 = nil
        end
        s3 << r6
      end
      if s3.last
        r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
        r3.extend(Comment0)
      else
        self.index = i3
        r3 = nil
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(Comment1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:comment][start_index] = r0

  return r0
end

#_nt_complex ⇒ Object 



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# File 'lib/parser/scheme.rb', line 916

def _nt_complex
  start_index = index
  if node_cache[:complex].has_key?(index)
    cached = node_cache[:complex][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1 = index
  r2 = _nt_real
  if r2
    r1 = r2
  else
    r3 = _nt_integer
    if r3
      r1 = r3
    else
      self.index = i1
      r1 = nil
    end
  end
  s0 << r1
  if r1
    if input.index("+", index) == index
      r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("+")
      r4 = nil
    end
    s0 << r4
    if r4
      i5 = index
      r6 = _nt_real
      if r6
        r5 = r6
      else
        r7 = _nt_integer
        if r7
          r5 = r7
        else
          self.index = i5
          r5 = nil
        end
      end
      s0 << r5
      if r5
        if input.index("i", index) == index
          r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("i")
          r8 = nil
        end
        s0 << r8
      end
    end
  end
  if s0.last
    r0 = instantiate_node(Complex,input, i0...index, s0)
    r0.extend(Complex0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:complex][start_index] = r0

  return r0
end

#_nt_datum ⇒ Object 



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# File 'lib/parser/scheme.rb', line 745

def _nt_datum
  start_index = index
  if node_cache[:datum].has_key?(index)
    cached = node_cache[:datum][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  i1 = index
  r2 = _nt_boolean
  if r2
    r1 = r2
  else
    r3 = _nt_number
    if r3
      r1 = r3
    else
      r4 = _nt_character
      if r4
        r1 = r4
      else
        r5 = _nt_string
        if r5
          r1 = r5
        else
          self.index = i1
          r1 = nil
        end
      end
    end
  end
  s0 << r1
  if r1
    i6 = index
    i7, s7 = index, []
    i8 = index
    r9 = _nt_delimiter
    if r9
      r8 = nil
    else
      self.index = i8
      r8 = instantiate_node(SyntaxNode,input, index...index)
    end
    s7 << r8
    if r8
      if index < input_length
        r10 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("any character")
        r10 = nil
      end
      s7 << r10
    end
    if s7.last
      r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
      r7.extend(Datum0)
    else
      self.index = i7
      r7 = nil
    end
    if r7
      r6 = nil
    else
      self.index = i6
      r6 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r6
  end
  if s0.last
    r0 = instantiate_node(Datum,input, i0...index, s0)
    r0.extend(Datum1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:datum][start_index] = r0

  return r0
end

#_nt_delimiter ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1527

def _nt_delimiter
  start_index = index
  if node_cache[:delimiter].has_key?(index)
    cached = node_cache[:delimiter][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_quote
  if r1
    r0 = r1
  else
    r2 = _nt_hash
    if r2
      r0 = r2
    else
      r3 = _nt_paren
      if r3
        r0 = r3
      else
        r4 = _nt_space
        if r4
          r0 = r4
        else
          self.index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:delimiter][start_index] = r0

  return r0
end

#_nt_digit ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1480

def _nt_digit
  start_index = index
  if node_cache[:digit].has_key?(index)
    cached = node_cache[:digit][index]
    @index = cached.interval.end if cached
    return cached
  end

  if input.index(Regexp.new('[0-9]'), index) == index
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    r0 = nil
  end

  node_cache[:digit][start_index] = r0

  return r0
end

#_nt_dot ⇒ Object 



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# File 'lib/parser/scheme.rb', line 310

def _nt_dot
  start_index = index
  if node_cache[:dot].has_key?(index)
    cached = node_cache[:dot][index]
    @index = cached.interval.end if cached
    return cached
  end

  if input.index(".", index) == index
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure(".")
    r0 = nil
  end

  node_cache[:dot][start_index] = r0

  return r0
end

#_nt_hash ⇒ Object 



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# File 'lib/parser/scheme.rb', line 331

def _nt_hash
  start_index = index
  if node_cache[:hash].has_key?(index)
    cached = node_cache[:hash][index]
    @index = cached.interval.end if cached
    return cached
  end

  if input.index("#", index) == index
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure("#")
    r0 = nil
  end

  node_cache[:hash][start_index] = r0

  return r0
end

#_nt_identifier ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1346

def _nt_identifier
  start_index = index
  if node_cache[:identifier].has_key?(index)
    cached = node_cache[:identifier][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  i2, s2 = index, []
  i3 = index
  r4 = _nt_delimiter
  if r4
    r3 = nil
  else
    self.index = i3
    r3 = instantiate_node(SyntaxNode,input, index...index)
  end
  s2 << r3
  if r3
    if index < input_length
      r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("any character")
      r5 = nil
    end
    s2 << r5
  end
  if s2.last
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    r2.extend(Identifier0)
  else
    self.index = i2
    r2 = nil
  end
  s1 << r2
  if r2
    s6, i6 = [], index
    loop do
      i7, s7 = index, []
      i8 = index
      r9 = _nt_delimiter
      if r9
        r8 = nil
      else
        self.index = i8
        r8 = instantiate_node(SyntaxNode,input, index...index)
      end
      s7 << r8
      if r8
        if index < input_length
          r10 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("any character")
          r10 = nil
        end
        s7 << r10
      end
      if s7.last
        r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
        r7.extend(Identifier1)
      else
        self.index = i7
        r7 = nil
      end
      if r7
        s6 << r7
      else
        break
      end
    end
    if s6.empty?
      self.index = i6
      r6 = nil
    else
      r6 = instantiate_node(SyntaxNode,input, i6...index, s6)
    end
    s1 << r6
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(Identifier2)
  else
    self.index = i1
    r1 = nil
  end
  if r1
    r0 = r1
    r0.extend(Identifier)
  else
    i11, s11 = index, []
    i12 = index
    r13 = _nt_reserved
    if r13
      r12 = nil
    else
      self.index = i12
      r12 = instantiate_node(SyntaxNode,input, index...index)
    end
    s11 << r12
    if r12
      if index < input_length
        r14 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("any character")
        r14 = nil
      end
      s11 << r14
    end
    if s11.last
      r11 = instantiate_node(SyntaxNode,input, i11...index, s11)
      r11.extend(Identifier3)
    else
      self.index = i11
      r11 = nil
    end
    if r11
      r0 = r11
      r0.extend(Identifier)
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:identifier][start_index] = r0

  return r0
end

#_nt_ignore ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1617

def _nt_ignore
  start_index = index
  if node_cache[:ignore].has_key?(index)
    cached = node_cache[:ignore][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  s1, i1 = [], index
  loop do
    r2 = _nt_space
    if r2
      s1 << r2
    else
      break
    end
  end
  r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
  s0 << r1
  if r1
    i4, s4 = index, []
    r5 = _nt_comment
    s4 << r5
    if r5
      r6 = _nt_ignore
      s4 << r6
    end
    if s4.last
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      r4.extend(Ignore0)
    else
      self.index = i4
      r4 = nil
    end
    if r4
      r3 = r4
    else
      r3 = instantiate_node(SyntaxNode,input, index...index)
    end
    s0 << r3
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(Ignore1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:ignore][start_index] = r0

  return r0
end

#_nt_integer ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1113

def _nt_integer
  start_index = index
  if node_cache[:integer].has_key?(index)
    cached = node_cache[:integer][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if input.index("-", index) == index
    r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure("-")
    r2 = nil
  end
  if r2
    r1 = r2
  else
    r1 = instantiate_node(SyntaxNode,input, index...index)
  end
  s0 << r1
  if r1
    i3 = index
    if input.index("0", index) == index
      r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("0")
      r4 = nil
    end
    if r4
      r3 = r4
    else
      i5, s5 = index, []
      if input.index(Regexp.new('[1-9]'), index) == index
        r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        r6 = nil
      end
      s5 << r6
      if r6
        s7, i7 = [], index
        loop do
          r8 = _nt_digit
          if r8
            s7 << r8
          else
            break
          end
        end
        r7 = instantiate_node(SyntaxNode,input, i7...index, s7)
        s5 << r7
      end
      if s5.last
        r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
        r5.extend(Integer0)
      else
        self.index = i5
        r5 = nil
      end
      if r5
        r3 = r5
      else
        self.index = i3
        r3 = nil
      end
    end
    s0 << r3
  end
  if s0.last
    r0 = instantiate_node(Integer,input, i0...index, s0)
    r0.extend(Integer1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:integer][start_index] = r0

  return r0
end

#_nt_list ⇒ Object 



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# File 'lib/parser/scheme.rb', line 366

def _nt_list
  start_index = index
  if node_cache[:list].has_key?(index)
    cached = node_cache[:list][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  if input.index("(", index) == index
    r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure("(")
    r2 = nil
  end
  s1 << r2
  if r2
    r3 = _nt_cells
    s1 << r3
    if r3
      if input.index(")", index) == index
        r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure(")")
        r4 = nil
      end
      s1 << r4
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(List0)
  else
    self.index = i1
    r1 = nil
  end
  if r1
    r0 = r1
    r0.extend(List)
  else
    i5, s5 = index, []
    if input.index("[", index) == index
      r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("[")
      r6 = nil
    end
    s5 << r6
    if r6
      r7 = _nt_cells
      s5 << r7
      if r7
        if input.index("]", index) == index
          r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure("]")
          r8 = nil
        end
        s5 << r8
      end
    end
    if s5.last
      r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
      r5.extend(List1)
    else
      self.index = i5
      r5 = nil
    end
    if r5
      r0 = r5
      r0.extend(List)
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:list][start_index] = r0

  return r0
end

#_nt_number ⇒ Object 



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# File 'lib/parser/scheme.rb', line 868

def _nt_number
  start_index = index
  if node_cache[:number].has_key?(index)
    cached = node_cache[:number][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_complex
  if r1
    r0 = r1
  else
    r2 = _nt_real
    if r2
      r0 = r2
    else
      r3 = _nt_rational
      if r3
        r0 = r3
      else
        r4 = _nt_integer
        if r4
          r0 = r4
        else
          self.index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:number][start_index] = r0

  return r0
end

#_nt_paren ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1564

def _nt_paren
  start_index = index
  if node_cache[:paren].has_key?(index)
    cached = node_cache[:paren][index]
    @index = cached.interval.end if cached
    return cached
  end

  if input.index(Regexp.new('[\\(\\)\\[\\]]'), index) == index
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    r0 = nil
  end

  node_cache[:paren][start_index] = r0

  return r0
end

#_nt_program ⇒ Object 



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# File 'lib/parser/scheme.rb', line 12

def _nt_program
  start_index = index
  if node_cache[:program].has_key?(index)
    cached = node_cache[:program][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r2 = _nt_shebang
  if r2
    r1 = r2
  else
    r1 = instantiate_node(SyntaxNode,input, index...index)
  end
  s0 << r1
  if r1
    s3, i3 = [], index
    loop do
      r4 = _nt_cell
      if r4
        s3 << r4
      else
        break
      end
    end
    r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
    s0 << r3
  end
  if s0.last
    r0 = instantiate_node(Program,input, i0...index, s0)
    r0.extend(Program0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:program][start_index] = r0

  return r0
end

#_nt_quote ⇒ Object 



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# File 'lib/parser/scheme.rb', line 249

def _nt_quote
  start_index = index
  if node_cache[:quote].has_key?(index)
    cached = node_cache[:quote][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  if input.index("'", index) == index
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure("'")
    r1 = nil
  end
  if r1
    r0 = r1
  else
    if input.index("`", index) == index
      r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("`")
      r2 = nil
    end
    if r2
      r0 = r2
    else
      if input.index(",@", index) == index
        r3 = instantiate_node(SyntaxNode,input, index...(index + 2))
        @index += 2
      else
        terminal_parse_failure(",@")
        r3 = nil
      end
      if r3
        r0 = r3
      else
        if input.index(",", index) == index
          r4 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          terminal_parse_failure(",")
          r4 = nil
        end
        if r4
          r0 = r4
        else
          self.index = i0
          r0 = nil
        end
      end
    end
  end

  node_cache[:quote][start_index] = r0

  return r0
end

#_nt_rational ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1069

def _nt_rational
  start_index = index
  if node_cache[:rational].has_key?(index)
    cached = node_cache[:rational][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_integer
  s0 << r1
  if r1
    if input.index("/", index) == index
      r2 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("/")
      r2 = nil
    end
    s0 << r2
    if r2
      r3 = _nt_integer
      s0 << r3
    end
  end
  if s0.last
    r0 = instantiate_node(Rational,input, i0...index, s0)
    r0.extend(Rational0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:rational][start_index] = r0

  return r0
end

#_nt_real ⇒ Object 



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# File 'lib/parser/scheme.rb', line 998

def _nt_real
  start_index = index
  if node_cache[:real].has_key?(index)
    cached = node_cache[:real][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  r1 = _nt_integer
  s0 << r1
  if r1
    i2, s2 = index, []
    if input.index(".", index) == index
      r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure(".")
      r3 = nil
    end
    s2 << r3
    if r3
      s4, i4 = [], index
      loop do
        r5 = _nt_digit
        if r5
          s4 << r5
        else
          break
        end
      end
      if s4.empty?
        self.index = i4
        r4 = nil
      else
        r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      end
      s2 << r4
    end
    if s2.last
      r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
      r2.extend(Real0)
    else
      self.index = i2
      r2 = nil
    end
    s0 << r2
  end
  if s0.last
    r0 = instantiate_node(Real,input, i0...index, s0)
    r0.extend(Real1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:real][start_index] = r0

  return r0
end

#_nt_reserved ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1500

def _nt_reserved
  start_index = index
  if node_cache[:reserved].has_key?(index)
    cached = node_cache[:reserved][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  r1 = _nt_dot
  if r1
    r0 = r1
  else
    r2 = _nt_delimiter
    if r2
      r0 = r2
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:reserved][start_index] = r0

  return r0
end

#_nt_shebang ⇒ Object 



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# File 'lib/parser/scheme.rb', line 60

def _nt_shebang
  start_index = index
  if node_cache[:shebang].has_key?(index)
    cached = node_cache[:shebang][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  s1, i1 = [], index
  loop do
    r2 = _nt_space
    if r2
      s1 << r2
    else
      break
    end
  end
  r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
  s0 << r1
  if r1
    if input.index("#!", index) == index
      r3 = instantiate_node(SyntaxNode,input, index...(index + 2))
      @index += 2
    else
      terminal_parse_failure("#!")
      r3 = nil
    end
    s0 << r3
    if r3
      s4, i4 = [], index
      loop do
        i5, s5 = index, []
        i6 = index
        if input.index(Regexp.new('[\\n\\r]'), index) == index
          r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          r7 = nil
        end
        if r7
          r6 = nil
        else
          self.index = i6
          r6 = instantiate_node(SyntaxNode,input, index...index)
        end
        s5 << r6
        if r6
          if index < input_length
            r8 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure("any character")
            r8 = nil
          end
          s5 << r8
        end
        if s5.last
          r5 = instantiate_node(SyntaxNode,input, i5...index, s5)
          r5.extend(Shebang0)
        else
          self.index = i5
          r5 = nil
        end
        if r5
          s4 << r5
        else
          break
        end
      end
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      s0 << r4
    end
  end
  if s0.last
    r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
    r0.extend(Shebang1)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:shebang][start_index] = r0

  return r0
end

#_nt_space ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1584

def _nt_space
  start_index = index
  if node_cache[:space].has_key?(index)
    cached = node_cache[:space][index]
    @index = cached.interval.end if cached
    return cached
  end

  if input.index(Regexp.new('[\\s\\n\\r\\t]'), index) == index
    r0 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    r0 = nil
  end

  node_cache[:space][start_index] = r0

  return r0
end

#_nt_string ⇒ Object 



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# File 'lib/parser/scheme.rb', line 1258

def _nt_string
  start_index = index
  if node_cache[:string].has_key?(index)
    cached = node_cache[:string][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0, s0 = index, []
  if input.index('"', index) == index
    r1 = instantiate_node(SyntaxNode,input, index...(index + 1))
    @index += 1
  else
    terminal_parse_failure('"')
    r1 = nil
  end
  s0 << r1
  if r1
    s2, i2 = [], index
    loop do
      i3 = index
      if input.index('\\"', index) == index
        r4 = instantiate_node(SyntaxNode,input, index...(index + 2))
        @index += 2
      else
        terminal_parse_failure('\\"')
        r4 = nil
      end
      if r4
        r3 = r4
      else
        if input.index(Regexp.new('[^"]'), index) == index
          r5 = instantiate_node(SyntaxNode,input, index...(index + 1))
          @index += 1
        else
          r5 = nil
        end
        if r5
          r3 = r5
        else
          self.index = i3
          r3 = nil
        end
      end
      if r3
        s2 << r3
      else
        break
      end
    end
    r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
    s0 << r2
    if r2
      if input.index('"', index) == index
        r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure('"')
        r6 = nil
      end
      s0 << r6
    end
  end
  if s0.last
    r0 = instantiate_node(String,input, i0...index, s0)
    r0.extend(String0)
  else
    self.index = i0
    r0 = nil
  end

  node_cache[:string][start_index] = r0

  return r0
end

#_nt_vector ⇒ Object 



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# File 'lib/parser/scheme.rb', line 591

def _nt_vector
  start_index = index
  if node_cache[:vector].has_key?(index)
    cached = node_cache[:vector][index]
    @index = cached.interval.end if cached
    return cached
  end

  i0 = index
  i1, s1 = index, []
  r2 = _nt_hash
  s1 << r2
  if r2
    if input.index("(", index) == index
      r3 = instantiate_node(SyntaxNode,input, index...(index + 1))
      @index += 1
    else
      terminal_parse_failure("(")
      r3 = nil
    end
    s1 << r3
    if r3
      s4, i4 = [], index
      loop do
        r5 = _nt_cell
        if r5
          s4 << r5
        else
          break
        end
      end
      r4 = instantiate_node(SyntaxNode,input, i4...index, s4)
      s1 << r4
      if r4
        r6 = _nt_ignore
        s1 << r6
        if r6
          if input.index(")", index) == index
            r7 = instantiate_node(SyntaxNode,input, index...(index + 1))
            @index += 1
          else
            terminal_parse_failure(")")
            r7 = nil
          end
          s1 << r7
        end
      end
    end
  end
  if s1.last
    r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
    r1.extend(Vector0)
  else
    self.index = i1
    r1 = nil
  end
  if r1
    r0 = r1
    r0.extend(Vector)
  else
    i8, s8 = index, []
    r9 = _nt_hash
    s8 << r9
    if r9
      if input.index("[", index) == index
        r10 = instantiate_node(SyntaxNode,input, index...(index + 1))
        @index += 1
      else
        terminal_parse_failure("[")
        r10 = nil
      end
      s8 << r10
      if r10
        s11, i11 = [], index
        loop do
          r12 = _nt_cell
          if r12
            s11 << r12
          else
            break
          end
        end
        r11 = instantiate_node(SyntaxNode,input, i11...index, s11)
        s8 << r11
        if r11
          r13 = _nt_ignore
          s8 << r13
          if r13
            if input.index("]", index) == index
              r14 = instantiate_node(SyntaxNode,input, index...(index + 1))
              @index += 1
            else
              terminal_parse_failure("]")
              r14 = nil
            end
            s8 << r14
          end
        end
      end
    end
    if s8.last
      r8 = instantiate_node(SyntaxNode,input, i8...index, s8)
      r8.extend(Vector1)
    else
      self.index = i8
      r8 = nil
    end
    if r8
      r0 = r8
      r0.extend(Vector)
    else
      self.index = i0
      r0 = nil
    end
  end

  node_cache[:vector][start_index] = r0

  return r0
end

#root ⇒ Object 



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# File 'lib/parser/scheme.rb', line 5

def root
  @root || :program
end