Class: Packcr::Node::QuantityNode

Inherits:
Packcr::Node show all
Defined in:
lib/packcr/node/quantity_node.rb,
lib/packcr/generated/node/quantity_node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Packcr::Node

#alt, #link_references, #reversible?, #seq, #sequence?, #setup, #setup_rule, #verify_captures, #verify_variables

Constructor Details

#initialize(expr = nil, min = 0, max = 0) ⇒ QuantityNode

Returns a new instance of QuantityNode.



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# File 'lib/packcr/node/quantity_node.rb', line 6

def initialize(expr = nil, min = 0, max = 0)
  super()
  @expr = expr
  @min = min
  @max = max
end

Instance Attribute Details

#expr ⇒ Object

Returns the value of attribute expr.



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# File 'lib/packcr/node/quantity_node.rb', line 4

def expr
  @expr
end

#max ⇒ Object

Returns the value of attribute max.



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# File 'lib/packcr/node/quantity_node.rb', line 4

def max
  @max
end

#min ⇒ Object

Returns the value of attribute min.



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# File 'lib/packcr/node/quantity_node.rb', line 4

def min
  @min
end

Instance Method Details

#debug_dump(indent = 0) ⇒ Object 



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# File 'lib/packcr/node/quantity_node.rb', line 13

def debug_dump(indent = 0)
  $stdout.print "#{" " * indent}Quantity(min:#{min}, max:#{max}) {\n"
  expr.debug_dump(indent + 2)
  $stdout.print "#{" " * indent}}\n"
end

#generate_code(gen, onfail, indent, bare, oncut: nil) ⇒ Object 



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# File 'lib/packcr/node/quantity_node.rb', line 19

def generate_code(gen, onfail, indent, bare, oncut: nil)
  if max > 1 || max < 0
    gen.write Packcr.format_code(get_many_code(gen, onfail, indent, bare, oncut), indent: indent, unwrap: bare)
  elsif max == 1
    if min > 0
      gen.write gen.generate_code(expr, onfail, indent, bare, oncut: oncut)
    else
      gen.write Packcr.format_code(get_one_code(gen, onfail, indent, bare, oncut), indent: indent, unwrap: bare)
    end
  end
end

#get_many_code(gen, onfail, indent, bare, oncut) ⇒ Object 



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# File 'lib/packcr/generated/node/quantity_node.rb', line 4

def get_many_code(gen, onfail, indent, bare, oncut)
  case gen.lang
  when :c
    erbout = +""
    erbout << "{\n".freeze

    r = expr.reachability
    if min > 0
      erbout << "    const size_t p0 = ctx->position_offset;\n".freeze

      if gen.location
        erbout << "    const packcr_location_t p0_loc = ctx->position_offset_loc;\n".freeze
      end
      erbout << "    const size_t n0 = chunk->thunks.len;\n".freeze
    end
    erbout << "    int i;\n".freeze

    if max < 0
      erbout << "    for (i = 0;; i++) {\n".freeze

    else
      erbout << "    for (i = 0; i < #{max}; i++) {\n".freeze
    end
    erbout << "        const size_t p = ctx->position_offset;\n".freeze

    if r != Packcr::CODE_REACH__ALWAYS_SUCCEED
      if gen.location
        erbout << "        const packcr_location_t p_loc = ctx->position_offset_loc;\n".freeze
      end
      erbout << "        const size_t n = chunk->thunks.len;\n".freeze
    end
    l = gen.next_label
    erbout << "#{gen.generate_code(expr, l, 8, false)}        if (ctx->position_offset == p) break;\n".freeze

    if r != Packcr::CODE_REACH__ALWAYS_SUCCEED
      erbout << "        continue;\n    L#{format("%04d", l)}:;\n        ctx->position_offset = p;\n".freeze

      if gen.location
        erbout << "        ctx->position_offset_loc = p_loc;\n".freeze
      end
      erbout << "        packcr_thunk_array__revert(ctx->auxil, &chunk->thunks, n);\n        break;\n".freeze
    end
    erbout << "    }\n".freeze

    if min > 0
      erbout << "    if (i < #{min}) {\n        ctx->position_offset = p0;\n".freeze

      if gen.location
        erbout << "        ctx->position_offset_loc = p0_loc;\n".freeze
      end
      erbout << "        packcr_thunk_array__revert(ctx->auxil, &chunk->thunks, n0);\n        goto L#{format("%04d", onfail)};\n    }\n".freeze
    end
    erbout << "}\n".freeze

    erbout
  when :rb
    erbout = +""
    if min > 0
      erbout << "q#{gen.level} = @position_offset\n".freeze

      if gen.location
        erbout << "q_loc#{gen.level} = @position_offset_loc\n".freeze
      end
      erbout << "m#{gen.level} = answer.thunks.length\n".freeze
    end
    erbout << "i#{gen.level} = 0\npos#{gen.level} = nil\n".freeze

    if gen.location
      erbout << "p_loc#{gen.level} = nil\n".freeze
    end
    erbout << "n#{gen.level} = nil\n".freeze

    l = gen.next_label
    erbout << "catch(#{l}) do\n  pos#{gen.level} = @position_offset\n".freeze

    if gen.location
      erbout << "  p_loc#{gen.level} = @position_offset_loc\n".freeze
    end
    erbout << "  n#{gen.level} = answer.thunks.length\n".freeze

    r = expr.reachability

    erbout << "#{gen.generate_code(expr, l, 2, false)}  i#{gen.level} += 1\n  if @position_offset != pos#{gen.level}".freeze
    if max >= 0
      erbout << " || i#{gen.level} < #{max}".freeze
    end
    erbout << "\n    redo\n  end\n  pos#{gen.level} = nil\nend\n".freeze

    if r != Packcr::CODE_REACH__ALWAYS_SUCCEED
      erbout << "if pos#{gen.level}\n  @position_offset = pos#{gen.level}\n".freeze

      if gen.location
        erbout << "  @position_offset_loc = p_loc#{gen.level}\n".freeze
      end
      erbout << "  answer.thunks[n#{gen.level}..-1] = []\nend\n".freeze
    end
    if min > 0
      erbout << "if i#{gen.level} < #{min}\n  @position_offset = q#{gen.level}\n".freeze

      if gen.location
        erbout << "  @position_offset_loc = q_loc#{gen.level}\n".freeze
      end
      erbout << "  answer.thunks[m#{gen.level}..-1] = []\n  throw(#{onfail})\nend\n".freeze
    end
    erbout
  end
end

#get_one_code(gen, onfail, indent, bare, oncut) ⇒ Object 



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# File 'lib/packcr/generated/node/quantity_node.rb', line 112

def get_one_code(gen, onfail, indent, bare, oncut)
  case gen.lang
  when :c
    erbout = +""
    r = expr.reachability
    if r == Packcr::CODE_REACH__ALWAYS_SUCCEED
      erbout << "#{gen.generate_code(expr, nil, 0, true)}".freeze
    else
      erbout << "{\n".freeze

      l = gen.next_label
      erbout << "    const size_t p = ctx->position_offset;\n".freeze

      if gen.location
        erbout << "    const packcr_location_t p_loc = ctx->position_offset_loc;\n".freeze
      end
      erbout << "    const size_t n = chunk->thunks.len;\n#{gen.generate_code(expr, l, 4, false)}".freeze
      m = gen.next_label
      erbout << "    goto L#{format("%04d", m)};\nL#{format("%04d", l)}:;\n".freeze

      if gen.location
        erbout << "    ctx->position_offset_loc = p_loc;\n".freeze
      end
      erbout << "    ctx->position_offset = p;\n    packcr_thunk_array__revert(ctx->auxil, &chunk->thunks, n);\nL#{format("%04d", m)}:;\n}\n".freeze
    end
    erbout
  when :rb
    erbout = +""
    r = expr.reachability
    if r == Packcr::CODE_REACH__ALWAYS_SUCCEED

      erbout << "#{gen.generate_code(expr, nil, 0, true)}".freeze
    else
      l = gen.next_label
      erbout << "pos#{gen.level} = @position_offset\n".freeze

      if gen.location
        erbout << "p_loc#{gen.level} = @position_offset_loc\n".freeze
      end
      erbout << "n#{gen.level} = answer.thunks.length\n".freeze

      m = gen.next_label
      erbout << "catch(#{m}) do\n  catch(#{l}) do\n#{gen.generate_code(expr, l, 4, false)}    throw(#{m})\n  end\n".freeze

      if gen.location
        erbout << "  @position_offset_loc = p_loc#{gen.level}\n".freeze
      end
      erbout << "  @position_offset = pos#{gen.level}\n  answer.thunks[n#{gen.level}..-1] = []\nend\n".freeze
    end
    erbout
  end
end

#nodes ⇒ Object 



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# File 'lib/packcr/node/quantity_node.rb', line 51

def nodes
  [expr]
end

#reachability ⇒ Object 



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# File 'lib/packcr/node/quantity_node.rb', line 31

def reachability
  if max > 1 || max < 0
    if min <= 0
      return Packcr::CODE_REACH__ALWAYS_SUCCEED
    end
    if expr.reachability == Packcr::CODE_REACH__ALWAYS_FAIL
      return Packcr::CODE_REACH__ALWAYS_FAIL
    end

    Packcr::CODE_REACH__BOTH
  elsif max == 1
    return expr.reachability if min > 0

    Packcr::CODE_REACH__ALWAYS_SUCCEED

  else
    Packcr::CODE_REACH__ALWAYS_SUCCEED
  end
end

#to_h ⇒ Object 



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# File 'lib/packcr/node/quantity_node.rb', line 55

def to_h
  {
    type: :predicate,
    expr: expr&.to_h,
    min: min,
    max: max,
  }
end