Class: Packcr::Node::CharclassNode

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Packcr::Node

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

Constructor Details

#initialize(value = nil) ⇒ CharclassNode

Returns a new instance of CharclassNode.



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

def initialize(value = nil)
  @value = value
end

Instance Attribute Details

#value ⇒ Object

Returns the value of attribute value.



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

def value
  @value
end

Instance Method Details

#debug_dump(indent = 0) ⇒ Object 



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# File 'lib/packcr/node/charclass_node.rb', line 10

def debug_dump(indent = 0)
  $stdout.print "#{" " * indent}Charclass(value:'"
  Packcr.dump_escaped_string(value)
  $stdout.print "')\n"
end

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



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# File 'lib/packcr/node/charclass_node.rb', line 20

def generate_code(gen, onfail, indent, unwrap, oncut: nil)
  return generate_ascii_code(gen, onfail, indent, unwrap) if gen.ascii

  generate_utf8_charclass_code(gen, onfail, indent, unwrap)
end

#generate_reverse_code(gen, onsuccess, indent, unwrap, oncut: nil) ⇒ Object 



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# File 'lib/packcr/node/charclass_node.rb', line 26

def generate_reverse_code(gen, onsuccess, indent, unwrap, oncut: nil)
  raise "unexpected" if gen.ascii

  generate_utf8_charclass_reverse_code(gen, onsuccess, indent, unwrap)
end

#get_any_code(gen, onfail, indent, unwrap, charclass) ⇒ Object 



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# File 'lib/packcr/generated/node/charclass_node.rb', line 100

def get_any_code(gen, onfail, indent, unwrap, charclass)
  case gen.lang
  when :c
    erbout = +""
    erbout << "if (packcr_refill_buffer(ctx, 1) < 1) goto L#{format("%04d", onfail)};\n".freeze

    if gen.location
      erbout << "packcr_location_forward(&ctx->position_offset, ctx->buffer.buf + ctx->position_offset, 1);\n".freeze
    end
    erbout << "ctx->position_offset++;\n".freeze

    erbout
  when :rb
    erbout = +""
    erbout << "if refill_buffer(1) < 1\n  throw(#{onfail})\nend\n".freeze

    if gen.location
      erbout << "@position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
    end
    erbout << "@position_offset += 1\n".freeze

    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#get_code(gen, onfail, indent, unwrap, charclass, n, a) ⇒ Object 



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

def get_code(gen, onfail, indent, unwrap, charclass, n, a)
  case gen.lang
  when :c
    erbout = +""
    erbout << "{\n    char c;\n    if (packcr_refill_buffer(ctx, 1) < 1) goto L#{format("%04d", onfail)};\n    c = ctx->buffer.buf[ctx->position_offset];\n".freeze
    if !a && charclass =~ /\A[^\\]-.\z/

      if a
        erbout << "    if (c >= '#{Packcr.escape_character(charclass[0])}' && c <= '#{Packcr.escape_character(charclass[2])}') goto L#{format("%04d", onfail)};\n".freeze

      else
        erbout << "    if (!(c >= '#{Packcr.escape_character(charclass[0])}' && c <= '#{Packcr.escape_character(charclass[2])}')) goto L#{format("%04d", onfail)};\n".freeze
      end

    else

      if a
        erbout << "    if (\n".freeze

      else
        erbout << "    if (!(\n".freeze
      end
      i = 0
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        if i + 2 < n && charclass[i + 1] == "-"
          erbout << "        (c >= '#{Packcr.escape_character(charclass[i])}' && c <= '#{Packcr.escape_character(charclass[i + 2])}')#{i + 3 == n ? "" : " ||"}\n".freeze

          i += 2
        else
          erbout << "        c == '#{Packcr.escape_character(charclass[i])}'#{i + 1 == n ? "" : " ||"}\n".freeze
        end
        i += 1
      end
      if a
        erbout << "    ) goto L#{format("%04d", onfail)};\n".freeze

      else
        erbout << "    )) goto L#{format("%04d", onfail)};\n".freeze
      end
    end
    if gen.location
      erbout << "    packcr_location_forward(&ctx->position_offset_loc, ctx->buffer.buf + ctx->position_offset, 1);\n".freeze
    end
    erbout << "    ctx->position_offset++;\n}\n".freeze

    erbout
  when :rb
    erbout = +""
    erbout << "if refill_buffer(1) < 1\n  throw(#{onfail})\nend\nc#{gen.level} = @buffer[@position_offset]\n".freeze
    if !a && charclass =~ /\A[^\\]-.\z/

      if a
        erbout << "if c#{gen.level} >= \"#{Packcr.escape_character(charclass[0])}\" && c#{gen.level} <= \"#{Packcr.escape_character(charclass[2])}\"\n  throw(#{onfail})\nend\n".freeze

      else
        erbout << "unless c#{gen.level} >= \"#{Packcr.escape_character(charclass[0])}\" && c#{gen.level} <= \"#{Packcr.escape_character(charclass[2])}\"\n  throw(#{onfail})\nend\n".freeze
      end

    else

      if a
        erbout << "if (\n".freeze

      else
        erbout << "unless (\n".freeze
      end
      i = 0
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        if i + 2 < n && charclass[i + 1] == "-"
          erbout << "  (c#{gen.level} >= \"#{Packcr.escape_character(charclass[i])}\" && c#{gen.level} <= \"#{Packcr.escape_character(charclass[i + 2])}\")#{i + 3 == n ? "" : " ||"}\n".freeze

          i += 2
        else
          erbout << "  c#{gen.level} == \"#{Packcr.escape_character(charclass[i])}\"#{i + 1 == n ? "" : " ||"}\n".freeze
        end
        i += 1
      end
      erbout << ")\n  throw(#{onfail})\nend\n".freeze

    end
    if gen.location
      erbout << "@position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
    end
    erbout << "@position_offset += 1\n".freeze
    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#get_fail_code(gen, onfail, indent, unwrap) ⇒ Object 



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# File 'lib/packcr/generated/node/charclass_node.rb', line 127

def get_fail_code(gen, onfail, indent, unwrap)
  case gen.lang
  when :c
    erbout = +""
    erbout << "goto L#{format("%04d", onfail)};\n".freeze

    erbout
  when :rb
    erbout = +""
    erbout << "throw(#{onfail})\n".freeze

    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#get_one_code(gen, onfail, indent, unwrap, charclass, n, a) ⇒ Object 



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# File 'lib/packcr/generated/node/charclass_node.rb', line 144

def get_one_code(gen, onfail, indent, unwrap, charclass, n, a)
  case gen.lang
  when :c
    erbout = +""
    if a
      erbout << "if (\n    packcr_refill_buffer(ctx, 1) < 1 ||\n    ctx->buffer.buf[ctx->position_offset] == '#{Packcr.escape_character(charclass[i])}'\n) goto L#{format("%04d", onfail)};\n".freeze

    else
      erbout << "if (\n    packcr_refill_buffer(ctx, 1) < 1 ||\n    ctx->buffer.buf[ctx->position_offset] != '#{Packcr.escape_character(charclass[0])}'\n) goto L#{format("%04d", onfail)};\n".freeze

    end
    if gen.location
      erbout << "    packcr_location_forward(&ctx->position_offset_loc, ctx->buffer.buf + ctx->position_offset, 1);\n".freeze
    end
    erbout << "ctx->position_offset++;\n".freeze
    erbout
  when :rb
    erbout = +""
    if a
      erbout << "if (\n  refill_buffer(1) < 1 ||\n  @buffer[@position_offset] == \"#{Packcr.escape_character(charclass[0])}\"\n)\n  throw(#{onfail})\nend\n".freeze

    else
      erbout << "if (\n  refill_buffer(1) < 1 ||\n  @buffer[@position_offset] != \"#{Packcr.escape_character(charclass[0])}\"\n)\n  throw(#{onfail})\nend\n".freeze

    end
    if gen.location
      erbout << "@position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
    end
    erbout << "@position_offset += 1\n".freeze
    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#get_utf8_code(gen, onfail, indent, unwrap, charclass, n) ⇒ Object 



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# File 'lib/packcr/generated/node/charclass_node.rb', line 179

def get_utf8_code(gen, onfail, indent, unwrap, charclass, n)
  case gen.lang
  when :c
    erbout = +""
    a = charclass && charclass[0] == "^"
    i = a ? 1 : 0
    erbout << "{\n    int u;\n    const size_t n = packcr_get_char_as_utf32(ctx, &u);\n    if (n == 0) goto L#{format("%04d", onfail)};\n".freeze

    if charclass && !(a && n == 1) # not '.' or '[^]'
      u0 = 0
      r = false
      if a
        erbout << "    if (\n".freeze

      else
        erbout << "    if (!(\n".freeze
      end
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        u = charclass[i].ord
        i += 1
        if r
          # character range
          erbout << "        (u >= 0x#{format("%06x", u0)} && u <= 0x#{format("%06x", u)})".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] != "-" || i == n - 1 # the individual '-' character is valid when it is at the first or the last position
          # single character
          erbout << "        u == 0x#{format("%06x", u)}".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] == "-"
          i += 1
          u0 = u
          r = true
        else
          raise "unexpected charclass #{charclass[i]}"
        end
      end
      if a
        erbout << "    ) goto L#{format("%04d", onfail)};\n".freeze

      else
        erbout << "    )) goto L#{format("%04d", onfail)};\n".freeze
      end
    end
    if gen.location
      erbout << "    packcr_location_forward(&ctx->position_offset_loc, ctx->buffer.buf + ctx->position_offset, n);\n".freeze
    end
    erbout << "    ctx->position_offset += n;\n}\n".freeze

    erbout
  when :rb
    erbout = +""
    a = charclass && charclass[0] == "^"
    i = a ? 1 : 0
    erbout << "if refill_buffer(1) < 1\n  throw(#{onfail})\nend\nu#{gen.level} = @buffer[@position_offset]\n".freeze

    if charclass && !(a && n == 1) # not '.' or '[^]'
      u0 = nil
      r = false
      if a
        erbout << "if (\n".freeze

      else
        erbout << "if (!(\n".freeze
      end
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        u = charclass[i]
        i += 1
        if r
          # character range
          erbout << "  (u#{gen.level} >= #{u0.dump} && u#{gen.level} <= #{u.dump})".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] != "-" || i == n - 1 # the individual '-' character is valid when it is at the first or the last position
          # single character
          erbout << "  u#{gen.level} == #{u.dump}".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] == "-"
          i += 1
          u0 = u
          r = true
        else
          raise "unexpected charclass #{charclass[i]}"
        end
      end
      if a
        erbout << ")\n".freeze

      else
        erbout << "))\n".freeze
      end
      erbout << "  throw(#{onfail})\nend\n".freeze
    end
    if gen.location
      erbout << "@position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
    end
    erbout << "@position_offset += 1\n".freeze

    erbout
  when :rs
    erbout = +""
    a = charclass && charclass[0] == "^"
    i = a ? 1 : 0
    any_code = !charclass || (a && n == 1)
    erbout << "let (#{any_code ? "_" : ""}u, n) = self.input.get_char_as_utf32();\nif n == 0 {\n    return throw(#{onfail});\n}\n".freeze

    unless any_code
      erbout << "if ".freeze
      if !a

        erbout << "!(".freeze
      end
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        u = charclass[i].ord
        i += 1
        if r
          # character range

          erbout << "(0x#{format("%06x", u0)}..=0x#{format("%06x", u)}).contains(&u)".freeze

          if i < n
            erbout << " || ".freeze
          end
          u0 = 0
          r = false
        elsif charclass[i] != "-" || i == n - 1 # the individual '-' character is valid when it is at the first or the last position
          # single character

          erbout << "u == 0x#{format("%06x", u)}".freeze
          if i < n
            erbout << " || ".freeze
          end
          u0 = 0
          r = false
        elsif charclass[i] == "-"
          i += 1
          u0 = u
          r = true
        else
          raise "unexpected charclass #{charclass[i]}"
        end
      end
      if !a
        erbout << ") ".freeze
      end

      erbout << "{\n    return throw(#{onfail});\n}\n".freeze
    end
    erbout << "self.input.position_offset += n;\n".freeze

    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#get_utf8_reverse_code(gen, onsuccess, indent, unwrap, charclass, n) ⇒ Object 



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# File 'lib/packcr/generated/node/charclass_node.rb', line 366

def get_utf8_reverse_code(gen, onsuccess, indent, unwrap, charclass, n)
  case gen.lang
  when :rb
    erbout = +""
    a = charclass && charclass[0] == "^"
    i = a ? 1 : 0
    erbout << "if refill_buffer(1) >= 1\n  u#{gen.level} = @buffer[@position_offset]\n".freeze

    if charclass && !(a && n == 1) # not '.' or '[^]'
      u0 = nil
      r = false
      if a
        erbout << "  unless (\n".freeze

      else
        erbout << "  if (\n".freeze
      end
      while i < n
        if charclass[i] == "\\" && i + 1 < n
          i += 1
        end
        u = charclass[i]
        i += 1
        if r
          # character range
          erbout << "    (u#{gen.level} >= #{u0.dump} && u#{gen.level} <= #{u.dump})".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] != "-" || i == n - 1 # the individual '-' character is valid when it is at the first or the last position
          # single character
          erbout << "    u#{gen.level} == #{u.dump}".freeze
          if i < n
            erbout << " ||".freeze
          end
          erbout << "\n".freeze

          u0 = 0
          r = false
        elsif charclass[i] == "-"
          i += 1
          u0 = u
          r = true
        else
          raise "unexpected charclass #{charclass[i]}"
        end
      end
      erbout << "  )\n".freeze

      if gen.location
        erbout << "    @position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
      end
      erbout << "    @position_offset += 1\n    throw(#{onsuccess})\n  end\n".freeze

    else # '.' or '[^]'
      if gen.location
        erbout << "  @position_offset_loc = @position_offset_loc.forward(@buffer, @position_offset, 1)\n".freeze
      end
      erbout << "  @position_offset += 1\n  throw(#{onsuccess})\n".freeze
    end
    erbout << "end\n".freeze

    erbout
  else
    raise "unknown lang #{gen.lang}"
  end
end

#reachability ⇒ Object 



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# File 'lib/packcr/node/charclass_node.rb', line 32

def reachability
  charclass = value
  n = charclass&.length || 0
  return Packcr::CODE_REACH__BOTH if charclass.nil? || n > 0

  Packcr::CODE_REACH__ALWAYS_FAIL
end

#reversible?(gen) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/packcr/node/charclass_node.rb', line 16

def reversible?(gen)
  gen.lang == :rb && !gen.ascii
end