Class: String

Inherits:
Object show all
Includes:
Comparable
Defined in:
opal/opal/corelib/string.rb,
opal/opal/corelib/complex.rb,
opal/opal/corelib/rational.rb,
opal/opal/corelib/unsupported.rb,
opal/opal/corelib/string/unpack.rb,
opal/opal/corelib/string/encoding.rb,
opal/opal/corelib/marshal/write_buffer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Comparable

#<, #<=, #>, #>=, #between?, #clamp

Constructor Details

#initialize(str = undefined, encoding: nil, capacity: nil) ⇒ String

Our initialize method does nothing, the string value setup is being done by String.new. Therefore not all kinds of subclassing will work. As a rule of thumb, when subclassing String, either make sure to override .new or make sure that the first argument given to a constructor is a string we want our subclass-string to hold.


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# File 'opal/opal/corelib/string.rb', line 51

def initialize(str = undefined, encoding: nil, capacity: nil)
end

Instance Attribute Details

#encodingObject (readonly)

Returns the value of attribute encoding.


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# File 'opal/opal/corelib/string/encoding.rb', line 305

def encoding
  @encoding
end

#internal_encodingObject (readonly)

Returns the value of attribute internal_encoding.


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# File 'opal/opal/corelib/string/encoding.rb', line 306

def internal_encoding
  @internal_encoding
end

Class Method Details

._load(*args) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1833

def self._load(*args)
  new(*args)
end

.new(*args) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 32

def self.new(*args)
  %x{
    var str = args[0] || "";
    var opts = args[args.length-1];
    str = $coerce_to(str, #{String}, 'to_str');
    if (opts && opts.$$is_hash) {
      if (opts.$$smap.encoding) str = str.$force_encoding(opts.$$smap.encoding);
    }
    str = new self.$$constructor(str);
    if (!str.$initialize.$$pristine) #{`str`.initialize(*args)};
    return str;
  }
end

.try_convert(what) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 28

def self.try_convert(what)
  Opal.coerce_to?(what, String, :to_str)
end

Instance Method Details

#%(data) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 54

def %(data)
  if Array === data
    format(self, *data)
  else
    format(self, data)
  end
end

#*(count) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 62

def *(count)
  %x{
    count = $coerce_to(count, #{Integer}, 'to_int');

    if (count < 0) {
      #{raise ArgumentError, 'negative argument'}
    }

    if (count === 0) {
      return self.$$cast('');
    }

    var result = '',
        string = self.toString();

    // All credit for the bit-twiddling magic code below goes to Mozilla
    // polyfill implementation of String.prototype.repeat() posted here:
    // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/repeat

    if (string.length * count >= 1 << 28) {
      #{raise RangeError, 'multiply count must not overflow maximum string size'}
    }

    for (;;) {
      if ((count & 1) === 1) {
        result += string;
      }
      count >>>= 1;
      if (count === 0) {
        break;
      }
      string += string;
    }

    return self.$$cast(result);
  }
end

#+(other) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 100

def +(other)
  other = `$coerce_to(#{other}, #{String}, 'to_str')`

  %x{
    if (other == "" && self.$$class === Opal.String) return #{self};
    if (self == "" && other.$$class === Opal.String) return #{other};
    var out = self + other;
    if (self.encoding === out.encoding && other.encoding === out.encoding) return out;
    if (self.encoding.name === "UTF-8" || other.encoding.name === "UTF-8") return out;
    return Opal.enc(out, self.encoding);
  }
end

#[email protected]Object


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# File 'opal/opal/corelib/string.rb', line 1864

def [email protected]
  %x{
    if (typeof self === 'string') return self;
    if (self.$$frozen === true) return self;
    if (self.encoding.name == 'UTF-8' && self.internal_encoding.name == 'UTF-8') return self.toString();
    return self.$dup().$freeze();
  }
end

#<<Object


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# File 'opal/opal/corelib/unsupported.rb', line 30

def <<(*)
  raise NotImplementedError, `ERROR` % '<<'
end

#<=>(other) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 113

def <=>(other)
  if other.respond_to? :to_str
    other = other.to_str.to_s

    `self > other ? 1 : (self < other ? -1 : 0)`
  else
    %x{
      var cmp = #{other <=> self};

      if (cmp === nil) {
        return nil;
      }
      else {
        return cmp > 0 ? -1 : (cmp < 0 ? 1 : 0);
      }
    }
  end
end

#==(other) ⇒ Object Also known as: eql?, ===


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# File 'opal/opal/corelib/string.rb', line 132

def ==(other)
  %x{
    if (other.$$is_string) {
      return self.toString() === other.toString();
    }
    if ($respond_to(other, '$to_str')) {
      return #{other == self};
    }
    return false;
  }
end

#=~(other) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 147

def =~(other)
  %x{
    if (other.$$is_string) {
      #{raise TypeError, 'type mismatch: String given'};
    }

    return #{other =~ self};
  }
end

#[](index, length = undefined) ⇒ Object Also known as: byteslice, slice


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# File 'opal/opal/corelib/string.rb', line 157

def [](index, length = undefined)
  %x{
    var size = self.length, exclude;

    if (index.$$is_range) {
      exclude = index.excl;
      length  = $coerce_to(index.end, #{Integer}, 'to_int');
      index   = $coerce_to(index.begin, #{Integer}, 'to_int');

      if (Math.abs(index) > size) {
        return nil;
      }

      if (index < 0) {
        index += size;
      }

      if (length < 0) {
        length += size;
      }

      if (!exclude) {
        length += 1;
      }

      length = length - index;

      if (length < 0) {
        length = 0;
      }

      return self.$$cast(self.substr(index, length));
    }


    if (index.$$is_string) {
      if (length != null) {
        #{raise TypeError}
      }
      return self.indexOf(index) !== -1 ? self.$$cast(index) : nil;
    }


    if (index.$$is_regexp) {
      var match = self.match(index);

      if (match === null) {
        #{$~ = nil}
        return nil;
      }

      #{$~ = MatchData.new(`index`, `match`)}

      if (length == null) {
        return self.$$cast(match[0]);
      }

      length = $coerce_to(length, #{Integer}, 'to_int');

      if (length < 0 && -length < match.length) {
        return self.$$cast(match[length += match.length]);
      }

      if (length >= 0 && length < match.length) {
        return self.$$cast(match[length]);
      }

      return nil;
    }


    index = $coerce_to(index, #{Integer}, 'to_int');

    if (index < 0) {
      index += size;
    }

    if (length == null) {
      if (index >= size || index < 0) {
        return nil;
      }
      return self.$$cast(self.substr(index, 1));
    }

    length = $coerce_to(length, #{Integer}, 'to_int');

    if (length < 0) {
      return nil;
    }

    if (index > size || index < 0) {
      return nil;
    }

    return self.$$cast(self.substr(index, length));
  }
end

#[]=Object


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# File 'opal/opal/corelib/unsupported.rb', line 106

def []=(*)
  raise NotImplementedError, `ERROR` % '[]='
end

#__id__Object Also known as: object_id


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# File 'opal/opal/corelib/string.rb', line 22

def __id__
  `self.toString()`
end

#__marshal__(buffer) ⇒ Object


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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 38

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.write_user_class(String, self)
  buffer.append('"')
  buffer.write_string(self)
end

#ascii_only?Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 694

def ascii_only?
  # non-ASCII-compatible encoding must return false
  %x{
    if (!self.encoding.ascii) return false;
    return /^[\x00-\x7F]*$/.test(self);
  }
end

#bObject


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# File 'opal/opal/corelib/string.rb', line 257

def b
  `new String(#{self})`.force_encoding('binary')
end

#bytesObject


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# File 'opal/opal/corelib/string/encoding.rb', line 327

def bytes
  # REMIND: required when running in strict mode, otherwise the following error will be thrown:
  # Cannot create property 'bytes' on string 'abc'
  %x{
    if (typeof self === 'string') {
      return #{`new String(self)`.each_byte.to_a};
    }
  }

  @bytes ||= each_byte.to_a
  @bytes.dup
end

#bytesizeObject


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# File 'opal/opal/corelib/string/encoding.rb', line 315

def bytesize
  @internal_encoding.bytesize(self)
end

#capitalizeObject


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# File 'opal/opal/corelib/string.rb', line 261

def capitalize
  `self.$$cast(self.charAt(0).toUpperCase() + self.substr(1).toLowerCase())`
end

#capitalize!Object


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# File 'opal/opal/corelib/unsupported.rb', line 34

def capitalize!(*)
  raise NotImplementedError, `ERROR` % 'capitalize!'
end

#casecmp(other) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 265

def casecmp(other)
  return nil unless other.respond_to?(:to_str)
  other = `$coerce_to(other, #{String}, 'to_str')`.to_s
  %x{
    var ascii_only = /^[\x00-\x7F]*$/;
    if (ascii_only.test(self) && ascii_only.test(other)) {
      self = self.toLowerCase();
      other = other.toLowerCase();
    }
  }
  self <=> other
end

#casecmp?(other) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 278

def casecmp?(other)
  %x{
    var cmp = #{casecmp(other)};
    if (cmp === nil) {
      return nil;
    } else {
      return cmp === 0;
    }
  }
end

#center(width, padstr = ' ') ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 289

def center(width, padstr = ' ')
  width  = `$coerce_to(#{width}, #{Integer}, 'to_int')`
  padstr = `$coerce_to(#{padstr}, #{String}, 'to_str')`.to_s

  if padstr.empty?
    raise ArgumentError, 'zero width padding'
  end

  return self if `width <= self.length`

  %x{
    var ljustified = #{ljust ((width + `self.length`) / 2).ceil, padstr},
        rjustified = #{rjust ((width + `self.length`) / 2).floor, padstr};

    return self.$$cast(rjustified + ljustified.slice(self.length));
  }
end

#chars(&block) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 348

def chars(&block)
  return each_char.to_a unless block

  each_char(&block)
end

#chomp(separator = $/) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 307

def chomp(separator = $/)
  return self if `separator === nil || self.length === 0`

  separator = Opal.coerce_to!(separator, String, :to_str).to_s

  %x{
    var result;

    if (separator === "\n") {
      result = self.replace(/\r?\n?$/, '');
    }
    else if (separator === "") {
      result = self.replace(/(\r?\n)+$/, '');
    }
    else if (self.length >= separator.length) {
      var tail = self.substr(self.length - separator.length, separator.length);

      if (tail === separator) {
        result = self.substr(0, self.length - separator.length);
      }
    }

    if (result != null) {
      return self.$$cast(result);
    }
  }

  self
end

#chomp!Object


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# File 'opal/opal/corelib/unsupported.rb', line 38

def chomp!(*)
  raise NotImplementedError, `ERROR` % 'chomp!'
end

#chopObject


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# File 'opal/opal/corelib/string.rb', line 337

def chop
  %x{
    var length = self.length, result;

    if (length <= 1) {
      result = "";
    } else if (self.charAt(length - 1) === "\n" && self.charAt(length - 2) === "\r") {
      result = self.substr(0, length - 2);
    } else {
      result = self.substr(0, length - 1);
    }

    return self.$$cast(result);
  }
end

#chop!Object


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# File 'opal/opal/corelib/unsupported.rb', line 42

def chop!(*)
  raise NotImplementedError, `ERROR` % 'chop!'
end

#chrObject


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# File 'opal/opal/corelib/string.rb', line 353

def chr
  `self.charAt(0)`
end

#clearObject


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# File 'opal/opal/corelib/unsupported.rb', line 110

def clear(*)
  raise NotImplementedError, `ERROR` % 'clear'
end

#cloneObject


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# File 'opal/opal/corelib/string.rb', line 357

def clone
  copy = `new String(self)`
  copy.copy_singleton_methods(self)
  copy.initialize_clone(self)
  copy
end

#codepoints(&block) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 364

def codepoints(&block)
  # If a block is given, which is a deprecated form, works the same as each_codepoint.
  return each_codepoint(&block) if block_given?
  each_codepoint.to_a
end

#count(*sets) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 370

def count(*sets)
  %x{
    if (sets.length === 0) {
      #{raise ArgumentError, 'ArgumentError: wrong number of arguments (0 for 1+)'}
    }
    var char_class = char_class_from_char_sets(sets);
    if (char_class === null) {
      return 0;
    }
    return self.length - self.replace(new RegExp(char_class, 'g'), '').length;
  }
end

#delete(*sets) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 383

def delete(*sets)
  %x{
    if (sets.length === 0) {
      #{raise ArgumentError, 'ArgumentError: wrong number of arguments (0 for 1+)'}
    }
    var char_class = char_class_from_char_sets(sets);
    if (char_class === null) {
      return self;
    }
    return self.$$cast(self.replace(new RegExp(char_class, 'g'), ''));
  }
end

#delete_prefix(prefix) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 396

def delete_prefix(prefix)
  %x{
    if (!prefix.$$is_string) {
      prefix = $coerce_to(prefix, #{String}, 'to_str');
    }

    if (self.slice(0, prefix.length) === prefix) {
      return self.$$cast(self.slice(prefix.length));
    } else {
      return self;
    }
  }
end

#delete_suffix(suffix) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 410

def delete_suffix(suffix)
  %x{
    if (!suffix.$$is_string) {
      suffix = $coerce_to(suffix, #{String}, 'to_str');
    }

    if (self.slice(self.length - suffix.length) === suffix) {
      return self.$$cast(self.slice(0, self.length - suffix.length));
    } else {
      return self;
    }
  }
end

#downcaseObject


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# File 'opal/opal/corelib/string.rb', line 424

def downcase
  `self.$$cast(self.toLowerCase())`
end

#downcase!Object


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# File 'opal/opal/corelib/unsupported.rb', line 46

def downcase!(*)
  raise NotImplementedError, `ERROR` % 'downcase!'
end

#dupObject Also known as: [email protected]


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# File 'opal/opal/corelib/string.rb', line 364

def dup
  copy = `new String(self)`
  copy.initialize_dup(self)
  copy
end

#each_byte(&block) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 319

def each_byte(&block)
  return enum_for(:each_byte) { bytesize } unless block_given?

  @internal_encoding.each_byte(self, &block)

  self
end

#each_char(&block) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 340

def each_char(&block)
  return enum_for(:each_char) { length } unless block_given?

  @encoding.each_char(self, &block)

  self
end

#each_codepoint(&block) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 354

def each_codepoint(&block)
  return enum_for :each_codepoint unless block_given?
  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      #{yield `self.codePointAt(i)`};
    }
  }
  self
end

#each_line(separator = $/, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 428

def each_line(separator = $/, &block)
  return enum_for :each_line, separator unless block_given?

  %x{
    if (separator === nil) {
      Opal.yield1(block, self);

      return self;
    }

    separator = $coerce_to(separator, #{String}, 'to_str')

    var a, i, n, length, chomped, trailing, splitted;

    if (separator.length === 0) {
      for (a = self.split(/(\n{2,})/), i = 0, n = a.length; i < n; i += 2) {
        if (a[i] || a[i + 1]) {
          var value = (a[i] || "") + (a[i + 1] || "");
          Opal.yield1(block, self.$$cast(value));
        }
      }

      return self;
    }

    chomped  = #{chomp(separator)};
    trailing = self.length != chomped.length;
    splitted = chomped.split(separator);

    for (i = 0, length = splitted.length; i < length; i++) {
      if (i < length - 1 || trailing) {
        Opal.yield1(block, self.$$cast(splitted[i] + separator));
      }
      else {
        Opal.yield1(block, self.$$cast(splitted[i]));
      }
    }
  }

  self
end

#empty?Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 470

def empty?
  `self.length === 0`
end

#encode(encoding) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 370

def encode(encoding)
  `Opal.enc(self, encoding)`
end

#encode!Object


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# File 'opal/opal/corelib/unsupported.rb', line 114

def encode!(*)
  raise NotImplementedError, `ERROR` % 'encode!'
end

#end_with?(*suffixes) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 474

def end_with?(*suffixes)
  %x{
    for (var i = 0, length = suffixes.length; i < length; i++) {
      var suffix = $coerce_to(suffixes[i], #{String}, 'to_str').$to_s();

      if (self.length >= suffix.length &&
          self.substr(self.length - suffix.length, suffix.length) == suffix) {
        return true;
      }
    }
  }

  false
end

#force_encoding(encoding) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 374

def force_encoding(encoding)
  %x{
    var str = self;

    if (encoding === str.encoding) { return str; }

    encoding = #{Opal.coerce_to!(encoding, String, :to_s)};
    encoding = #{Encoding.find(encoding)};

    if (encoding === str.encoding) { return str; }

    str = Opal.set_encoding(str, encoding);

    return str;
  }
end

#freezeObject


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# File 'opal/opal/corelib/string.rb', line 1854

def freeze
  %x{
    if (typeof self === 'string') return self;
    self.$$frozen = true;
    return self;
  }
end

#frozen?Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 1873

def frozen?
  `typeof self === 'string' || self.$$frozen === true`
end

#getbyte(idx) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 391

def getbyte(idx)
  string_bytes = bytes
  idx = Opal.coerce_to!(idx, Integer, :to_int)
  return if string_bytes.length < idx

  string_bytes[idx]
end

#gsub(pattern, replacement = undefined, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 491

def gsub(pattern, replacement = undefined, &block)
  %x{
    if (replacement === undefined && block === nil) {
      return #{enum_for :gsub, pattern};
    }

    var result = '', match_data = nil, index = 0, match, _replacement;

    if (pattern.$$is_regexp) {
      pattern = Opal.global_multiline_regexp(pattern);
    } else {
      pattern = $coerce_to(pattern, #{String}, 'to_str');
      pattern = new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'gm');
    }

    var lastIndex;
    while (true) {
      match = pattern.exec(self);

      if (match === null) {
        #{$~ = nil}
        result += self.slice(index);
        break;
      }

      match_data = #{MatchData.new `pattern`, `match`};

      if (replacement === undefined) {
        lastIndex = pattern.lastIndex;
        _replacement = block(match[0]);
        pattern.lastIndex = lastIndex; // save and restore lastIndex
      }
      else if (replacement.$$is_hash) {
        _replacement = #{`replacement`[`match[0]`].to_s};
      }
      else {
        if (!replacement.$$is_string) {
          replacement = $coerce_to(replacement, #{String}, 'to_str');
        }
        _replacement = replacement.replace(/([\\]+)([0-9+&`'])/g, function (original, slashes, command) {
          if (slashes.length % 2 === 0) {
            return original;
          }
          switch (command) {
          case "+":
            for (var i = match.length - 1; i > 0; i--) {
              if (match[i] !== undefined) {
                return slashes.slice(1) + match[i];
              }
            }
            return '';
          case "&": return slashes.slice(1) + match[0];
          case "`": return slashes.slice(1) + self.slice(0, match.index);
          case "'": return slashes.slice(1) + self.slice(match.index + match[0].length);
          default:  return slashes.slice(1) + (match[command] || '');
          }
        }).replace(/\\\\/g, '\\');
      }

      if (pattern.lastIndex === match.index) {
        result += (self.slice(index, match.index) + _replacement + (self[match.index] || ""));
        pattern.lastIndex += 1;
      }
      else {
        result += (self.slice(index, match.index) + _replacement)
      }
      index = pattern.lastIndex;
    }

    #{$~ = `match_data`}
    return self.$$cast(result);
  }
end

#gsub!Object


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# File 'opal/opal/corelib/unsupported.rb', line 50

def gsub!(*)
  raise NotImplementedError, `ERROR` % 'gsub!'
end

#hashObject


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# File 'opal/opal/corelib/string.rb', line 565

def hash
  `self.toString()`
end

#hexObject


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# File 'opal/opal/corelib/string.rb', line 569

def hex
  to_i 16
end

#include?(other) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 573

def include?(other)
  %x{
    if (!other.$$is_string) {
      other = $coerce_to(other, #{String}, 'to_str');
    }
    return self.indexOf(other) !== -1;
  }
end

#index(search, offset = undefined) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 582

def index(search, offset = undefined)
  %x{
    var index,
        match,
        regex;

    if (offset === undefined) {
      offset = 0;
    } else {
      offset = $coerce_to(offset, #{Integer}, 'to_int');
      if (offset < 0) {
        offset += self.length;
        if (offset < 0) {
          return nil;
        }
      }
    }

    if (search.$$is_regexp) {
      regex = Opal.global_multiline_regexp(search);
      while (true) {
        match = regex.exec(self);
        if (match === null) {
          #{$~ = nil};
          index = -1;
          break;
        }
        if (match.index >= offset) {
          #{$~ = MatchData.new(`regex`, `match`)}
          index = match.index;
          break;
        }
        regex.lastIndex = match.index + 1;
      }
    } else {
      search = $coerce_to(search, #{String}, 'to_str');
      if (search.length === 0 && offset > self.length) {
        index = -1;
      } else {
        index = self.indexOf(search, offset);
      }
    }

    return index === -1 ? nil : index;
  }
end

#initialize_copy(other) ⇒ Object


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# File 'opal/opal/corelib/string/encoding.rb', line 399

def initialize_copy(other)
  %{
    self.encoding = other.encoding;
    self.internal_encoding = other.internal_encoding;
  }
end

#inspectObject


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# File 'opal/opal/corelib/string.rb', line 629

def inspect
  %x{
    var escapable = /[\\\"\x00-\x1f\u007F-\u009F\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        meta = {
          '\u0007': '\\a',
          '\u001b': '\\e',
          '\b': '\\b',
          '\t': '\\t',
          '\n': '\\n',
          '\f': '\\f',
          '\r': '\\r',
          '\v': '\\v',
          '"' : '\\"',
          '\\': '\\\\'
        },
        escaped = self.replace(escapable, function (chr) {
          if (meta[chr]) return meta[chr];
          chr = chr.charCodeAt(0);
          if (chr <= 0xff && (self.encoding["$binary?"]() || self.internal_encoding["$binary?"]())) {
            return '\\x' + ('00' + chr.toString(16).toUpperCase()).slice(-2);
          } else {
            return '\\u' + ('0000' + chr.toString(16).toUpperCase()).slice(-4);
          }
        });
    return '"' + escaped.replace(/\#[\$\@\{]/g, '\\$&') + '"';
  }
end

#instance_variablesObject


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# File 'opal/opal/corelib/string.rb', line 1829

def instance_variables
  []
end

#internObject Also known as: to_sym


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# File 'opal/opal/corelib/string.rb', line 657

def intern
  `self.toString()`
end

#lengthObject Also known as: size


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# File 'opal/opal/corelib/string/encoding.rb', line 406

def length
  `self.length`
end

#lines(separator = $/, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 661

def lines(separator = $/, &block)
  e = each_line(separator, &block)
  block ? self : e.to_a
end

#ljust(width, padstr = ' ') ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 666

def ljust(width, padstr = ' ')
  width  = `$coerce_to(#{width}, #{Integer}, 'to_int')`
  padstr = `$coerce_to(#{padstr}, #{String}, 'to_str')`.to_s

  if padstr.empty?
    raise ArgumentError, 'zero width padding'
  end

  return self if `width <= self.length`

  %x{
    var index  = -1,
        result = "";

    width -= self.length;

    while (++index < width) {
      result += padstr;
    }

    return self.$$cast(self + result.slice(0, width));
  }
end

#lstripObject


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# File 'opal/opal/corelib/string.rb', line 690

def lstrip
  `self.replace(/^\s*/, '')`
end

#lstrip!Object


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# File 'opal/opal/corelib/unsupported.rb', line 54

def lstrip!(*)
  raise NotImplementedError, `ERROR` % 'lstrip!'
end

#match(pattern, pos = undefined, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 702

def match(pattern, pos = undefined, &block)
  if String === pattern || pattern.respond_to?(:to_str)
    pattern = Regexp.new(pattern.to_str)
  end

  unless Regexp === pattern
    raise TypeError, "wrong argument type #{pattern.class} (expected Regexp)"
  end

  pattern.match(self, pos, &block)
end

#match?(pattern, pos = undefined) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 714

def match?(pattern, pos = undefined)
  if String === pattern || pattern.respond_to?(:to_str)
    pattern = Regexp.new(pattern.to_str)
  end

  unless Regexp === pattern
    raise TypeError, "wrong argument type #{pattern.class} (expected Regexp)"
  end

  pattern.match?(self, pos)
end

#nextObject Also known as: succ


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# File 'opal/opal/corelib/string.rb', line 726

def next
  %x{
    var i = self.length;
    if (i === 0) {
      return self.$$cast('');
    }
    var result = self;
    var first_alphanum_char_index = self.search(/[a-zA-Z0-9]/);
    var carry = false;
    var code;
    while (i--) {
      code = self.charCodeAt(i);
      if ((code >= 48 && code <= 57) ||
        (code >= 65 && code <= 90) ||
        (code >= 97 && code <= 122)) {
        switch (code) {
        case 57:
          carry = true;
          code = 48;
          break;
        case 90:
          carry = true;
          code = 65;
          break;
        case 122:
          carry = true;
          code = 97;
          break;
        default:
          carry = false;
          code += 1;
        }
      } else {
        if (first_alphanum_char_index === -1) {
          if (code === 255) {
            carry = true;
            code = 0;
          } else {
            carry = false;
            code += 1;
          }
        } else {
          carry = true;
        }
      }
      result = result.slice(0, i) + String.fromCharCode(code) + result.slice(i + 1);
      if (carry && (i === 0 || i === first_alphanum_char_index)) {
        switch (code) {
        case 65:
          break;
        case 97:
          break;
        default:
          code += 1;
        }
        if (i === 0) {
          result = String.fromCharCode(code) + result;
        } else {
          result = result.slice(0, i) + String.fromCharCode(code) + result.slice(i);
        }
        carry = false;
      }
      if (!carry) {
        break;
      }
    }
    return self.$$cast(result);
  }
end

#next!Object


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# File 'opal/opal/corelib/unsupported.rb', line 58

def next!(*)
  raise NotImplementedError, `ERROR` % 'next!'
end

#octObject


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# File 'opal/opal/corelib/string.rb', line 796

def oct
  %x{
    var result,
        string = self,
        radix = 8;

    if (/^\s*_/.test(string)) {
      return 0;
    }

    string = string.replace(/^(\s*[+-]?)(0[bodx]?)(.+)$/i, function (original, head, flag, tail) {
      switch (tail.charAt(0)) {
      case '+':
      case '-':
        return original;
      case '0':
        if (tail.charAt(1) === 'x' && flag === '0x') {
          return original;
        }
      }
      switch (flag) {
      case '0b':
        radix = 2;
        break;
      case '0':
      case '0o':
        radix = 8;
        break;
      case '0d':
        radix = 10;
        break;
      case '0x':
        radix = 16;
        break;
      }
      return head + tail;
    });

    result = parseInt(string.replace(/_(?!_)/g, ''), radix);
    return isNaN(result) ? 0 : result;
  }
end

#ordObject


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# File 'opal/opal/corelib/string.rb', line 839

def ord
  %x{
    if (typeof self.codePointAt === "function") {
      return self.codePointAt(0);
    }
    else {
      return self.charCodeAt(0);
    }
  }
end

#partition(sep) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 850

def partition(sep)
  %x{
    var i, m;

    if (sep.$$is_regexp) {
      m = sep.exec(self);
      if (m === null) {
        i = -1;
      } else {
        #{MatchData.new `sep`, `m`};
        sep = m[0];
        i = m.index;
      }
    } else {
      sep = $coerce_to(sep, #{String}, 'to_str');
      i = self.indexOf(sep);
    }

    if (i === -1) {
      return [self, '', ''];
    }

    return [
      self.slice(0, i),
      self.slice(i, i + sep.length),
      self.slice(i + sep.length)
    ];
  }
end

#prependObject


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# File 'opal/opal/corelib/unsupported.rb', line 102

def prepend(*)
  raise NotImplementedError, `ERROR` % 'prepend'
end

#reverseObject


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# File 'opal/opal/corelib/string.rb', line 880

def reverse
  `self.split('').reverse().join('')`
end

#reverse!Object


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# File 'opal/opal/corelib/unsupported.rb', line 62

def reverse!(*)
  raise NotImplementedError, `ERROR` % 'reverse!'
end

#rindex(search, offset = undefined) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 884

def rindex(search, offset = undefined)
  %x{
    var i, m, r, _m;

    if (offset === undefined) {
      offset = self.length;
    } else {
      offset = $coerce_to(offset, #{Integer}, 'to_int');
      if (offset < 0) {
        offset += self.length;
        if (offset < 0) {
          return nil;
        }
      }
    }

    if (search.$$is_regexp) {
      m = null;
      r = Opal.global_multiline_regexp(search);
      while (true) {
        _m = r.exec(self);
        if (_m === null || _m.index > offset) {
          break;
        }
        m = _m;
        r.lastIndex = m.index + 1;
      }
      if (m === null) {
        #{$~ = nil}
        i = -1;
      } else {
        #{MatchData.new `r`, `m`};
        i = m.index;
      }
    } else {
      search = $coerce_to(search, #{String}, 'to_str');
      i = self.lastIndexOf(search, offset);
    }

    return i === -1 ? nil : i;
  }
end

#rjust(width, padstr = ' ') ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 927

def rjust(width, padstr = ' ')
  width  = `$coerce_to(#{width}, #{Integer}, 'to_int')`
  padstr = `$coerce_to(#{padstr}, #{String}, 'to_str')`.to_s

  if padstr.empty?
    raise ArgumentError, 'zero width padding'
  end

  return self if `width <= self.length`

  %x{
    var chars     = Math.floor(width - self.length),
        patterns  = Math.floor(chars / padstr.length),
        result    = Array(patterns + 1).join(padstr),
        remaining = chars - result.length;

    return self.$$cast(result + padstr.slice(0, remaining) + self);
  }
end

#rpartition(sep) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 947

def rpartition(sep)
  %x{
    var i, m, r, _m;

    if (sep.$$is_regexp) {
      m = null;
      r = Opal.global_multiline_regexp(sep);

      while (true) {
        _m = r.exec(self);
        if (_m === null) {
          break;
        }
        m = _m;
        r.lastIndex = m.index + 1;
      }

      if (m === null) {
        i = -1;
      } else {
        #{MatchData.new `r`, `m`};
        sep = m[0];
        i = m.index;
      }

    } else {
      sep = $coerce_to(sep, #{String}, 'to_str');
      i = self.lastIndexOf(sep);
    }

    if (i === -1) {
      return ['', '', self];
    }

    return [
      self.slice(0, i),
      self.slice(i, i + sep.length),
      self.slice(i + sep.length)
    ];
  }
end

#rstripObject


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# File 'opal/opal/corelib/string.rb', line 989

def rstrip
  `self.replace(/[\s\u0000]*$/, '')`
end

#scan(pattern, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 993

def scan(pattern, &block)
  %x{
    var result = [],
        match_data = nil,
        match;

    if (pattern.$$is_regexp) {
      pattern = Opal.global_multiline_regexp(pattern);
    } else {
      pattern = $coerce_to(pattern, #{String}, 'to_str');
      pattern = new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'gm');
    }

    while ((match = pattern.exec(self)) != null) {
      match_data = #{MatchData.new `pattern`, `match`};
      if (block === nil) {
        match.length == 1 ? result.push(match[0]) : result.push(#{`match_data`.captures});
      } else {
        match.length == 1 ? block(match[0]) : block.call(self, #{`match_data`.captures});
      }
      if (pattern.lastIndex === match.index) {
        pattern.lastIndex += 1;
      }
    }

    #{$~ = `match_data`}

    return (block !== nil ? self : result);
  }
end

#slice!Object


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# File 'opal/opal/corelib/unsupported.rb', line 66

def slice!(*)
  raise NotImplementedError, `ERROR` % 'slice!'
end

#split(pattern = undefined, limit = undefined) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1026

def split(pattern = undefined, limit = undefined)
  %x{
    if (self.length === 0) {
      return [];
    }

    if (limit === undefined) {
      limit = 0;
    } else {
      limit = #{Opal.coerce_to!(limit, Integer, :to_int)};
      if (limit === 1) {
        return [self];
      }
    }

    if (pattern === undefined || pattern === nil) {
      pattern = #{$; || ' '};
    }

    var result = [],
        string = self.toString(),
        index = 0,
        match,
        i, ii;

    if (pattern.$$is_regexp) {
      pattern = Opal.global_multiline_regexp(pattern);
    } else {
      pattern = $coerce_to(pattern, #{String}, 'to_str').$to_s();
      if (pattern === ' ') {
        pattern = /\s+/gm;
        string = string.replace(/^\s+/, '');
      } else {
        pattern = new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), 'gm');
      }
    }

    result = string.split(pattern);

    if (result.length === 1 && result[0] === string) {
      return [self.$$cast(result[0])];
    }

    while ((i = result.indexOf(undefined)) !== -1) {
      result.splice(i, 1);
    }

    function castResult() {
      for (i = 0; i < result.length; i++) {
        result[i] = self.$$cast(result[i]);
      }
    }

    if (limit === 0) {
      while (result[result.length - 1] === '') {
        result.length -= 1;
      }
      castResult();
      return result;
    }

    match = pattern.exec(string);

    if (limit < 0) {
      if (match !== null && match[0] === '' && pattern.source.indexOf('(?=') === -1) {
        for (i = 0, ii = match.length; i < ii; i++) {
          result.push('');
        }
      }
      castResult();
      return result;
    }

    if (match !== null && match[0] === '') {
      result.splice(limit - 1, result.length - 1, result.slice(limit - 1).join(''));
      castResult();
      return result;
    }

    if (limit >= result.length) {
      castResult();
      return result;
    }

    i = 0;
    while (match !== null) {
      i++;
      index = pattern.lastIndex;
      if (i + 1 === limit) {
        break;
      }
      match = pattern.exec(string);
    }
    result.splice(limit - 1, result.length - 1, string.slice(index));
    castResult();
    return result;
  }
end

#squeeze(*sets) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1125

def squeeze(*sets)
  %x{
    if (sets.length === 0) {
      return self.$$cast(self.replace(/(.)\1+/g, '$1'));
    }
    var char_class = char_class_from_char_sets(sets);
    if (char_class === null) {
      return self;
    }
    return self.$$cast(self.replace(new RegExp('(' + char_class + ')\\1+', 'g'), '$1'));
  }
end

#squeeze!Object


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# File 'opal/opal/corelib/unsupported.rb', line 70

def squeeze!(*)
  raise NotImplementedError, `ERROR` % 'squeeze!'
end

#start_with?(*prefixes) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 1138

def start_with?(*prefixes)
  %x{
    for (var i = 0, length = prefixes.length; i < length; i++) {
      if (prefixes[i].$$is_regexp) {
        var regexp = prefixes[i];
        var match = regexp.exec(self);

        if (match != null && match.index === 0) {
          #{$~ = MatchData.new(`regexp`, `match`)};
          return true;
        } else {
          #{$~ = nil}
        }
      } else {
        var prefix = $coerce_to(prefixes[i], #{String}, 'to_str').$to_s();

        if (self.indexOf(prefix) === 0) {
          return true;
        }
      }
    }

    return false;
  }
end

#stripObject


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# File 'opal/opal/corelib/string.rb', line 1164

def strip
  `self.replace(/^\s*/, '').replace(/[\s\u0000]*$/, '')`
end

#strip!Object


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# File 'opal/opal/corelib/unsupported.rb', line 74

def strip!(*)
  raise NotImplementedError, `ERROR` % 'strip!'
end

#sub(pattern, replacement = undefined, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1168

def sub(pattern, replacement = undefined, &block)
  %x{
    if (!pattern.$$is_regexp) {
      pattern = $coerce_to(pattern, #{String}, 'to_str');
      pattern = new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'));
    }

    var result, match = pattern.exec(self);

    if (match === null) {
      #{$~ = nil}
      result = self.toString();
    } else {
      #{MatchData.new `pattern`, `match`}

      if (replacement === undefined) {

        if (block === nil) {
          #{raise ArgumentError, 'wrong number of arguments (1 for 2)'}
        }
        result = self.slice(0, match.index) + block(match[0]) + self.slice(match.index + match[0].length);

      } else if (replacement.$$is_hash) {

        result = self.slice(0, match.index) + #{`replacement`[`match[0]`].to_s} + self.slice(match.index + match[0].length);

      } else {

        replacement = $coerce_to(replacement, #{String}, 'to_str');

        replacement = replacement.replace(/([\\]+)([0-9+&`'])/g, function (original, slashes, command) {
          if (slashes.length % 2 === 0) {
            return original;
          }
          switch (command) {
          case "+":
            for (var i = match.length - 1; i > 0; i--) {
              if (match[i] !== undefined) {
                return slashes.slice(1) + match[i];
              }
            }
            return '';
          case "&": return slashes.slice(1) + match[0];
          case "`": return slashes.slice(1) + self.slice(0, match.index);
          case "'": return slashes.slice(1) + self.slice(match.index + match[0].length);
          default:  return slashes.slice(1) + (match[command] || '');
          }
        }).replace(/\\\\/g, '\\');

        result = self.slice(0, match.index) + replacement + self.slice(match.index + match[0].length);
      }
    }

    return self.$$cast(result);
  }
end

#sub!Object


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# File 'opal/opal/corelib/unsupported.rb', line 78

def sub!(*)
  raise NotImplementedError, `ERROR` % 'sub!'
end

#succ!Object


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# File 'opal/opal/corelib/unsupported.rb', line 82

def succ!(*)
  raise NotImplementedError, `ERROR` % 'succ!'
end

#sum(n = 16) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1227

def sum(n = 16)
  %x{
    n = $coerce_to(n, #{Integer}, 'to_int');

    var result = 0,
        length = self.length,
        i = 0;

    for (; i < length; i++) {
      result += self.charCodeAt(i);
    }

    if (n <= 0) {
      return result;
    }

    return result & (Math.pow(2, n) - 1);
  }
end

#swapcaseObject


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# File 'opal/opal/corelib/string.rb', line 1247

def swapcase
  %x{
    var str = self.replace(/([a-z]+)|([A-Z]+)/g, function($0,$1,$2) {
      return $1 ? $0.toUpperCase() : $0.toLowerCase();
    });

    if (self.constructor === String) {
      return str;
    }

    return #{self.class.new `str`};
  }
end

#swapcase!Object


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# File 'opal/opal/corelib/unsupported.rb', line 86

def swapcase!(*)
  raise NotImplementedError, `ERROR` % 'swapcase!'
end

#to_cObject


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# File 'opal/opal/corelib/complex.rb', line 307

def to_c
  %x{
    var str = self,
        re = /[+-]?[\d_]+(\.[\d_]+)?(e\d+)?/,
        match = str.match(re),
        real, imag, denominator;

    function isFloat() {
      return re.test(str);
    }

    function cutFloat() {
      var match = str.match(re);
      var number = match[0];
      str = str.slice(number.length);
      return number.replace(/_/g, '');
    }

    // handles both floats and rationals
    function cutNumber() {
      if (isFloat()) {
        var numerator = parseFloat(cutFloat());

        if (str[0] === '/') {
          // rational real part
          str = str.slice(1);

          if (isFloat()) {
            var denominator = parseFloat(cutFloat());
            return #{Rational(`numerator`, `denominator`)};
          } else {
            // reverting '/'
            str = '/' + str;
            return numerator;
          }
        } else {
          // float real part, no denominator
          return numerator;
        }
      } else {
        return null;
      }
    }

    real = cutNumber();

    if (!real) {
      if (str[0] === 'i') {
        // i => Complex(0, 1)
        return #{Complex(0, 1)};
      }
      if (str[0] === '-' && str[1] === 'i') {
        // -i => Complex(0, -1)
        return #{Complex(0, -1)};
      }
      if (str[0] === '+' && str[1] === 'i') {
        // +i => Complex(0, 1)
        return #{Complex(0, 1)};
      }
      // anything => Complex(0, 0)
      return #{Complex(0, 0)};
    }

    imag = cutNumber();
    if (!imag) {
      if (str[0] === 'i') {
        // 3i => Complex(0, 3)
        return #{Complex(0, `real`)};
      } else {
        // 3 => Complex(3, 0)
        return #{Complex(`real`, 0)};
      }
    } else {
      // 3+2i => Complex(3, 2)
      return #{Complex(`real`, `imag`)};
    }
  }
end

#to_fObject


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# File 'opal/opal/corelib/string.rb', line 1261

def to_f
  %x{
    if (self.charAt(0) === '_') {
      return 0;
    }

    var result = parseFloat(self.replace(/_/g, ''));

    if (isNaN(result) || result == Infinity || result == -Infinity) {
      return 0;
    }
    else {
      return result;
    }
  }
end

#to_i(base = 10) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1278

def to_i(base = 10)
  %x{
    var result,
        string = self.toLowerCase(),
        radix = $coerce_to(base, #{Integer}, 'to_int');

    if (radix === 1 || radix < 0 || radix > 36) {
      #{raise ArgumentError, "invalid radix #{`radix`}"}
    }

    if (/^\s*_/.test(string)) {
      return 0;
    }

    string = string.replace(/^(\s*[+-]?)(0[bodx]?)(.+)$/, function (original, head, flag, tail) {
      switch (tail.charAt(0)) {
      case '+':
      case '-':
        return original;
      case '0':
        if (tail.charAt(1) === 'x' && flag === '0x' && (radix === 0 || radix === 16)) {
          return original;
        }
      }
      switch (flag) {
      case '0b':
        if (radix === 0 || radix === 2) {
          radix = 2;
          return head + tail;
        }
        break;
      case '0':
      case '0o':
        if (radix === 0 || radix === 8) {
          radix = 8;
          return head + tail;
        }
        break;
      case '0d':
        if (radix === 0 || radix === 10) {
          radix = 10;
          return head + tail;
        }
        break;
      case '0x':
        if (radix === 0 || radix === 16) {
          radix = 16;
          return head + tail;
        }
        break;
      }
      return original
    });

    result = parseInt(string.replace(/_(?!_)/g, ''), radix);
    return isNaN(result) ? 0 : result;
  }
end

#to_procObject


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# File 'opal/opal/corelib/string.rb', line 1337

def to_proc
  method_name = '$' + `self.valueOf()`

  proc do |*args, &block|
    %x{
      if (args.length === 0) {
        #{raise ArgumentError, 'no receiver given'}
      }

      var recv = args[0];

      if (recv == null) recv = nil;

      var body = recv[#{method_name}];

      if (!body) {
        return recv.$method_missing.apply(recv, args);
      }

      if (typeof block === 'function') {
        body.$$p = block;
      }

      if (args.length === 1) {
        return body.call(recv);
      } else {
        return body.apply(recv, args.slice(1));
      }
    }
  end
end

#to_rObject


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# File 'opal/opal/corelib/rational.rb', line 362

def to_r
  %x{
    var str = self.trimLeft(),
        re = /^[+-]?[\d_]+(\.[\d_]+)?/,
        match = str.match(re),
        numerator, denominator;

    function isFloat() {
      return re.test(str);
    }

    function cutFloat() {
      var match = str.match(re);
      var number = match[0];
      str = str.slice(number.length);
      return number.replace(/_/g, '');
    }

    if (isFloat()) {
      numerator = parseFloat(cutFloat());

      if (str[0] === '/') {
        // rational real part
        str = str.slice(1);

        if (isFloat()) {
          denominator = parseFloat(cutFloat());
          return #{Rational(`numerator`, `denominator`)};
        } else {
          return #{Rational(`numerator`, 1)};
        }
      } else {
        return #{Rational(`numerator`, 1)};
      }
    } else {
      return #{Rational(0, 1)};
    }
  }
end

#to_sObject Also known as: to_str


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# File 'opal/opal/corelib/string.rb', line 1369

def to_s
  `self.toString()`
end

#tr(from, to) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1377

def tr(from, to)
  %x{
    from = $coerce_to(from, #{String}, 'to_str').$to_s();
    to = $coerce_to(to, #{String}, 'to_str').$to_s();

    if (from.length == 0 || from === to) {
      return self;
    }

    var i, in_range, c, ch, start, end, length;
    var subs = {};
    var from_chars = from.split('');
    var from_length = from_chars.length;
    var to_chars = to.split('');
    var to_length = to_chars.length;

    var inverse = false;
    var global_sub = null;
    if (from_chars[0] === '^' && from_chars.length > 1) {
      inverse = true;
      from_chars.shift();
      global_sub = to_chars[to_length - 1]
      from_length -= 1;
    }

    var from_chars_expanded = [];
    var last_from = null;
    in_range = false;
    for (i = 0; i < from_length; i++) {
      ch = from_chars[i];
      if (last_from == null) {
        last_from = ch;
        from_chars_expanded.push(ch);
      }
      else if (ch === '-') {
        if (last_from === '-') {
          from_chars_expanded.push('-');
          from_chars_expanded.push('-');
        }
        else if (i == from_length - 1) {
          from_chars_expanded.push('-');
        }
        else {
          in_range = true;
        }
      }
      else if (in_range) {
        start = last_from.charCodeAt(0);
        end = ch.charCodeAt(0);
        if (start > end) {
          #{raise ArgumentError, "invalid range \"#{`String.fromCharCode(start)`}-#{`String.fromCharCode(end)`}\" in string transliteration"}
        }
        for (c = start + 1; c < end; c++) {
          from_chars_expanded.push(String.fromCharCode(c));
        }
        from_chars_expanded.push(ch);
        in_range = null;
        last_from = null;
      }
      else {
        from_chars_expanded.push(ch);
      }
    }

    from_chars = from_chars_expanded;
    from_length = from_chars.length;

    if (inverse) {
      for (i = 0; i < from_length; i++) {
        subs[from_chars[i]] = true;
      }
    }
    else {
      if (to_length > 0) {
        var to_chars_expanded = [];
        var last_to = null;
        in_range = false;
        for (i = 0; i < to_length; i++) {
          ch = to_chars[i];
          if (last_to == null) {
            last_to = ch;
            to_chars_expanded.push(ch);
          }
          else if (ch === '-') {
            if (last_to === '-') {
              to_chars_expanded.push('-');
              to_chars_expanded.push('-');
            }
            else if (i == to_length - 1) {
              to_chars_expanded.push('-');
            }
            else {
              in_range = true;
            }
          }
          else if (in_range) {
            start = last_to.charCodeAt(0);
            end = ch.charCodeAt(0);
            if (start > end) {
              #{raise ArgumentError, "invalid range \"#{`String.fromCharCode(start)`}-#{`String.fromCharCode(end)`}\" in string transliteration"}
            }
            for (c = start + 1; c < end; c++) {
              to_chars_expanded.push(String.fromCharCode(c));
            }
            to_chars_expanded.push(ch);
            in_range = null;
            last_to = null;
          }
          else {
            to_chars_expanded.push(ch);
          }
        }

        to_chars = to_chars_expanded;
        to_length = to_chars.length;
      }

      var length_diff = from_length - to_length;
      if (length_diff > 0) {
        var pad_char = (to_length > 0 ? to_chars[to_length - 1] : '');
        for (i = 0; i < length_diff; i++) {
          to_chars.push(pad_char);
        }
      }

      for (i = 0; i < from_length; i++) {
        subs[from_chars[i]] = to_chars[i];
      }
    }

    var new_str = ''
    for (i = 0, length = self.length; i < length; i++) {
      ch = self.charAt(i);
      var sub = subs[ch];
      if (inverse) {
        new_str += (sub == null ? global_sub : ch);
      }
      else {
        new_str += (sub != null ? sub : ch);
      }
    }
    return self.$$cast(new_str);
  }
end

#tr!Object


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# File 'opal/opal/corelib/unsupported.rb', line 90

def tr!(*)
  raise NotImplementedError, `ERROR` % 'tr!'
end

#tr_s(from, to) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1522

def tr_s(from, to)
  %x{
    from = $coerce_to(from, #{String}, 'to_str').$to_s();
    to = $coerce_to(to, #{String}, 'to_str').$to_s();

    if (from.length == 0) {
      return self;
    }

    var i, in_range, c, ch, start, end, length;
    var subs = {};
    var from_chars = from.split('');
    var from_length = from_chars.length;
    var to_chars = to.split('');
    var to_length = to_chars.length;

    var inverse = false;
    var global_sub = null;
    if (from_chars[0] === '^' && from_chars.length > 1) {
      inverse = true;
      from_chars.shift();
      global_sub = to_chars[to_length - 1]
      from_length -= 1;
    }

    var from_chars_expanded = [];
    var last_from = null;
    in_range = false;
    for (i = 0; i < from_length; i++) {
      ch = from_chars[i];
      if (last_from == null) {
        last_from = ch;
        from_chars_expanded.push(ch);
      }
      else if (ch === '-') {
        if (last_from === '-') {
          from_chars_expanded.push('-');
          from_chars_expanded.push('-');
        }
        else if (i == from_length - 1) {
          from_chars_expanded.push('-');
        }
        else {
          in_range = true;
        }
      }
      else if (in_range) {
        start = last_from.charCodeAt(0);
        end = ch.charCodeAt(0);
        if (start > end) {
          #{raise ArgumentError, "invalid range \"#{`String.fromCharCode(start)`}-#{`String.fromCharCode(end)`}\" in string transliteration"}
        }
        for (c = start + 1; c < end; c++) {
          from_chars_expanded.push(String.fromCharCode(c));
        }
        from_chars_expanded.push(ch);
        in_range = null;
        last_from = null;
      }
      else {
        from_chars_expanded.push(ch);
      }
    }

    from_chars = from_chars_expanded;
    from_length = from_chars.length;

    if (inverse) {
      for (i = 0; i < from_length; i++) {
        subs[from_chars[i]] = true;
      }
    }
    else {
      if (to_length > 0) {
        var to_chars_expanded = [];
        var last_to = null;
        in_range = false;
        for (i = 0; i < to_length; i++) {
          ch = to_chars[i];
          if (last_from == null) {
            last_from = ch;
            to_chars_expanded.push(ch);
          }
          else if (ch === '-') {
            if (last_to === '-') {
              to_chars_expanded.push('-');
              to_chars_expanded.push('-');
            }
            else if (i == to_length - 1) {
              to_chars_expanded.push('-');
            }
            else {
              in_range = true;
            }
          }
          else if (in_range) {
            start = last_from.charCodeAt(0);
            end = ch.charCodeAt(0);
            if (start > end) {
              #{raise ArgumentError, "invalid range \"#{`String.fromCharCode(start)`}-#{`String.fromCharCode(end)`}\" in string transliteration"}
            }
            for (c = start + 1; c < end; c++) {
              to_chars_expanded.push(String.fromCharCode(c));
            }
            to_chars_expanded.push(ch);
            in_range = null;
            last_from = null;
          }
          else {
            to_chars_expanded.push(ch);
          }
        }

        to_chars = to_chars_expanded;
        to_length = to_chars.length;
      }

      var length_diff = from_length - to_length;
      if (length_diff > 0) {
        var pad_char = (to_length > 0 ? to_chars[to_length - 1] : '');
        for (i = 0; i < length_diff; i++) {
          to_chars.push(pad_char);
        }
      }

      for (i = 0; i < from_length; i++) {
        subs[from_chars[i]] = to_chars[i];
      }
    }
    var new_str = ''
    var last_substitute = null
    for (i = 0, length = self.length; i < length; i++) {
      ch = self.charAt(i);
      var sub = subs[ch]
      if (inverse) {
        if (sub == null) {
          if (last_substitute == null) {
            new_str += global_sub;
            last_substitute = true;
          }
        }
        else {
          new_str += ch;
          last_substitute = null;
        }
      }
      else {
        if (sub != null) {
          if (last_substitute == null || last_substitute !== sub) {
            new_str += sub;
            last_substitute = sub;
          }
        }
        else {
          new_str += ch;
          last_substitute = null;
        }
      }
    }
    return self.$$cast(new_str);
  }
end

#tr_s!Object


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# File 'opal/opal/corelib/unsupported.rb', line 94

def tr_s!(*)
  raise NotImplementedError, `ERROR` % 'tr_s!'
end

#unicode_normalize(form = :nfc) ⇒ Object

Raises:


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# File 'opal/opal/corelib/string.rb', line 1837

def unicode_normalize(form = :nfc)
  raise ArgumentError, "Invalid normalization form #{form}" unless %i[nfc nfd nfkc nfkd].include?(form)
  `self.normalize(#{form.upcase})`
end

#unicode_normalize!Object


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# File 'opal/opal/corelib/unsupported.rb', line 118

def unicode_normalize!(*)
  raise NotImplementedError, `ERROR` % 'unicode_normalize!'
end

#unicode_normalized?(form = :nfc) ⇒ Boolean

Returns:


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# File 'opal/opal/corelib/string.rb', line 1842

def unicode_normalized?(form = :nfc)
  unicode_normalize(form) == self
end

#unpack(format) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1846

def unpack(format)
  raise "To use String#unpack, you must first require 'corelib/string/unpack'."
end

#unpack1(format) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1850

def unpack1(format)
  raise "To use String#unpack1, you must first require 'corelib/string/unpack'."
end

#upcaseObject


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# File 'opal/opal/corelib/string.rb', line 1685

def upcase
  `self.$$cast(self.toUpperCase())`
end

#upcase!Object


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# File 'opal/opal/corelib/unsupported.rb', line 98

def upcase!(*)
  raise NotImplementedError, `ERROR` % 'upcase!'
end

#upto(stop, excl = false, &block) ⇒ Object


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# File 'opal/opal/corelib/string.rb', line 1689

def upto(stop, excl = false, &block)
  return enum_for :upto, stop, excl unless block_given?
  %x{
    var a, b, s = self.toString();

    stop = $coerce_to(stop, #{String}, 'to_str');

    if (s.length === 1 && stop.length === 1) {

      a = s.charCodeAt(0);
      b = stop.charCodeAt(0);

      while (a <= b) {
        if (excl && a === b) {
          break;
        }

        block(String.fromCharCode(a));

        a += 1;
      }

    } else if (parseInt(s, 10).toString() === s && parseInt(stop, 10).toString() === stop) {

      a = parseInt(s, 10);
      b = parseInt(stop, 10);

      while (a <= b) {
        if (excl && a === b) {
          break;
        }

        block(a.toString());

        a += 1;
      }

    } else {

      while (s.length <= stop.length && s <= stop) {
        if (excl && s === stop) {
          break;
        }

        block(s);

        s = #{`s`.succ};
      }

    }
    return self;
  }
end

#valid_encoding?Boolean

stub

Returns:


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# File 'opal/opal/corelib/string/encoding.rb', line 413

def valid_encoding?
  true
end