Class: String

Inherits:
Object show all
Includes:
Comparable
Defined in:
opal/opal/corelib/string.rb,
opal/opal/corelib/unsupported.rb,
opal/opal/corelib/string/encoding.rb,
opal/opal/corelib/string/inheritance.rb

Defined Under Namespace

Classes: Wrapper

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Comparable

#<, #<=, #>, #>=, #between?, normalize

Constructor Details

#initialize(str = undefined) ⇒ String

Returns a new instance of String

Raises:



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# File 'opal/opal/corelib/string.rb', line 24

def initialize(str = undefined)
  %x{
    if (str === undefined) {
      return self;
    }
  }
  raise NotImplementedError, 'Mutable strings are not supported in Opal.'
end

Class Method Details

.inherited(klass) ⇒ Object 



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# File 'opal/opal/corelib/string/inheritance.rb', line 4

def self.inherited(klass)
  replace = Class.new(String::Wrapper)

  %x{
    klass.$$proto         = replace.$$proto;
    klass.$$proto.$$class = klass;
    klass.$$alloc         = replace.$$alloc;
    klass.$$parent        = #{String::Wrapper};

    klass.$allocate = replace.$allocate;
    klass.$new      = replace.$new;
  }
end

.new(str = '') ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 19

def self.new(str = '')
  str = Opal.coerce_to(str, String, :to_str)
  `new String(str)`
end

.try_convert(what) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 15

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 33

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 41

def *(count)
  %x{
    count = #{Opal.coerce_to(`count`, Integer, :to_int)};

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

    if (count === 0) {
      return '';
    }

    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 result;
  }
end

#+(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 79

def +(other)
  other = Opal.coerce_to other, String, :to_str

  `self + #{other.to_s}`
end

#<< ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 17

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

#<=>(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 85

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 104

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

#=~(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 119

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 129

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

    if (index.$$is_range) {
      exclude = index.exclude;
      length  = #{Opal.coerce_to(`index.end`, Integer, :to_int)};
      index   = #{Opal.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.substr(index, length);
    }


    if (index.$$is_string) {
      if (length != null) {
        #{raise TypeError}
      }
      return self.indexOf(index) !== -1 ? 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 match[0];
      }

      length = #{Opal.coerce_to(`length`, Integer, :to_int)};

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

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

      return nil;
    }


    index = #{Opal.coerce_to(`index`, Integer, :to_int)};

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

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

    length = #{Opal.coerce_to(`length`, Integer, :to_int)};

    if (length < 0) {
      return nil;
    }

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

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

#__id__ ⇒ Object Also known as: object_id 



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# File 'opal/opal/corelib/string.rb', line 9

def __id__
  `self.toString()`
end

#bytes ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 135

def bytes
  each_byte.to_a
end

#bytesize ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 139

def bytesize
  @encoding.bytesize(self)
end

#capitalize ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 229

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

#capitalize! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 21

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

#casecmp(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 233

def casecmp(other)
  other = Opal.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

#center(width, padstr = ' ') ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 245

def center(width, padstr = ' ')
  width  = Opal.coerce_to(width, Integer, :to_int)
  padstr = Opal.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 + @length) / 2).ceil, padstr},
        rjustified = #{rjust ((width + @length) / 2).floor, padstr};

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

#chars(&block) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 263

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 269

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

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

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

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

  self
end

#chomp! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 25

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

#chop ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 293

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

    if (length <= 1) {
      return "";
    }

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

#chop! ⇒ Object

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# File 'opal/opal/corelib/unsupported.rb', line 29

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

#chr ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 310

def chr
  `self.charAt(0)`
end

#clone ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 314

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

#count(*sets) ⇒ Object 



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

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 340

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.replace(new RegExp(char_class, 'g'), '');
  }
end

#downcase ⇒ Object 



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

def downcase
  `self.toLowerCase()`
end

#downcase! ⇒ Object

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# File 'opal/opal/corelib/unsupported.rb', line 33

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

#dup ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 321

def dup
  copy = `self.slice()`
  copy.initialize_dup(self)
  copy
end

#each_byte(&block) ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 143

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

  @encoding.each_byte(self, &block)

  self
end

#each_char(&block) ⇒ Object 



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

def each_char(&block)
  return enum_for(:each_char){self.size} unless block_given?

  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      var value = Opal.yield1(block, self.charAt(i));

      if (value === $breaker) {
        return $breaker.$v;
      }
    }
  }

  self
end

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



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# File 'opal/opal/corelib/string.rb', line 373

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

  %x{
    var value;

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

      if (value === $breaker) {
        return value.$v;
      }
      else {
        return self;
      }
    }

    separator = #{Opal.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]) {
          value = Opal.yield1(block, (a[i] || "") + (a[i + 1] || ""));

          if (value === $breaker) {
            return value.$v;
          }
        }
      }

      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) {
        value = Opal.yield1(block, splitted[i] + separator);

        if (value === $breaker) {
          return value.$v;
        }
      }
      else {
        value = Opal.yield1(block, splitted[i]);

        if (value === $breaker) {
          return value.$v;
        }
      }
    }
  }

  self
end

#empty? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 433

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

#encode(encoding) ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 151

def encode(encoding)
  dup.force_encoding(encoding)
end

#encoding ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 155

def encoding
  @encoding
end

#end_with?(*suffixes) ⇒ Boolean

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# File 'opal/opal/corelib/string.rb', line 437

def end_with?(*suffixes)
  %x{
    for (var i = 0, length = suffixes.length; i < length; i++) {
      var suffix = #{Opal.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

Raises:



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# File 'opal/opal/corelib/string/encoding.rb', line 159

def force_encoding(encoding)
  encoding = Opal.coerce_to!(encoding, String, :to_str)
  encoding = Encoding.find(encoding)

  return self if encoding == @encoding
  raise ArgumentError, "unknown encoding name - #{encoding}" if encoding.nil?

  %x{
    var result = new String(self);
    result.encoding = encoding;

    return result;
  }
end

#getbyte(idx) ⇒ Object 



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# File 'opal/opal/corelib/string/encoding.rb', line 174

def getbyte(idx)
  @encoding.getbyte(self, idx)
end

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



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# File 'opal/opal/corelib/string.rb', line 455

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

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

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

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

      if (replacement === undefined) {
        _replacement = block(match[0]);
      }
      else if (replacement.$$is_hash) {
        _replacement = #{`replacement`[`match[0]`].to_s};
      }
      else {
        if (!replacement.$$is_string) {
          replacement = #{Opal.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 += (_replacement + self.slice(index, match.index + 1))
        pattern.lastIndex += 1;
      }
      else {
        result += (self.slice(index, match.index) + _replacement)
      }
      index = pattern.lastIndex;
    }

    #{$~ = `match_data`}
    return result;
  }
end

#gsub! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 37

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

#hash ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 526

def hash
  `self.toString()`
end

#hex ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 530

def hex
  to_i 16
end

#include?(other) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 534

def include?(other)
  %x{
    if (other.$$is_string) {
      return self.indexOf(other) !== -1;
    }
  }

  unless other.respond_to? :to_str
    raise TypeError, "no implicit conversion of #{other.class} into String"
  end

  `self.indexOf(#{other.to_str}) !== -1`
end

#index(search, offset = undefined) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 548

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

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

    if (search.$$is_regexp) {
      regex = new RegExp(search.source, 'gm' + (search.ignoreCase ? 'i' : ''));
      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 = #{Opal.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

#inspect ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 595

def inspect
  %x{
    var escapable = /[\\\"\x00-\x1f\x7f-\x9f\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) {
          return meta[chr] || '\\u' + ('0000' + chr.charCodeAt(0).toString(16).toUpperCase()).slice(-4);
        });
    return '"' + escaped.replace(/\#[\$\@\{]/g, '\\$&') + '"';
  }
end

#intern ⇒ Object Also known as: to_sym 



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# File 'opal/opal/corelib/string.rb', line 617

def intern
  self
end

#length ⇒ Object Also known as: size 



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# File 'opal/opal/corelib/string.rb', line 626

def length
  `self.length`
end

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



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# File 'opal/opal/corelib/string.rb', line 621

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 630

def ljust(width, padstr = ' ')
  width  = Opal.coerce_to(width, Integer, :to_int)
  padstr = Opal.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 + result.slice(0, width);
  }
end

#lstrip ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 654

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

#lstrip! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 41

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

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



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# File 'opal/opal/corelib/string.rb', line 658

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

#next ⇒ Object Also known as: succ 



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# File 'opal/opal/corelib/string.rb', line 670

def next
  %x{
    var i = self.length;
    if (i === 0) {
      return '';
    }
    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 result;
  }
end

#next! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 45

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

#oct ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 740

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

#ord ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 783

def ord
  `self.charCodeAt(0)`
end

#partition(sep) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 787

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 = #{Opal.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

#reverse ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 817

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

#reverse! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 49

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

#rindex(search, offset = undefined) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 821

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

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

    if (search.$$is_regexp) {
      m = null;
      r = new RegExp(search.source, 'gm' + (search.ignoreCase ? 'i' : ''));
      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 = #{Opal.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 864

def rjust(width, padstr = ' ')
  width  = Opal.coerce_to(width, Integer, :to_int)
  padstr = Opal.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 result + padstr.slice(0, remaining) + self;
  }
end

#rpartition(sep) ⇒ Object 



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

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

    if (sep.$$is_regexp) {
      m = null;
      r = new RegExp(sep.source, 'gm' + (sep.ignoreCase ? 'i' : ''));

      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 = #{Opal.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

#rstrip ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 926

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

#scan(pattern, &block) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 930

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

    if (pattern.$$is_regexp) {
      pattern = new RegExp(pattern.source, 'gm' + (pattern.ignoreCase ? 'i' : ''));
    } else {
      pattern = #{Opal.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

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 53

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

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



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# File 'opal/opal/corelib/string.rb', line 965

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;

    if (pattern.$$is_regexp) {
      pattern = new RegExp(pattern.source, 'gm' + (pattern.ignoreCase ? 'i' : ''));
    } else {
      pattern = #{Opal.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 result;
    }

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

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

    match = pattern.exec(string);

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

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

#squeeze(*sets) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1050

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

#squeeze! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 57

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

#start_with?(*prefixes) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 1063

def start_with?(*prefixes)
  %x{
    for (var i = 0, length = prefixes.length; i < length; i++) {
      var prefix = #{Opal.coerce_to(`prefixes[i]`, String, :to_str).to_s};

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

    return false;
  }
end

#strip ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1077

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

#strip! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 61

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

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



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# File 'opal/opal/corelib/string.rb', line 1081

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

    var result = pattern.exec(self);

    if (result === null) {
      #{$~ = nil}
      return self.toString();
    }

    #{MatchData.new `pattern`, `result`}

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

    if (replacement.$$is_hash) {
      return self.slice(0, result.index) + #{`replacement`[`result[0]`].to_s} + self.slice(result.index + result[0].length);
    }

    replacement = #{Opal.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 = result.length - 1; i > 0; i--) {
          if (result[i] !== undefined) {
            return slashes.slice(1) + result[i];
          }
        }
        return '';
      case "&": return slashes.slice(1) + result[0];
      case "`": return slashes.slice(1) + self.slice(0, result.index);
      case "'": return slashes.slice(1) + self.slice(result.index + result[0].length);
      default:  return slashes.slice(1) + (result[command] || '');
      }
    }).replace(/\\\\/g, '\\');

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

#sub! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 65

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

#succ! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 69

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

#sum(n = 16) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1135

def sum(n = 16)
  %x{
    n = #{Opal.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

#swapcase ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1155

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

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 73

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

#to_f ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1169

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 1186

def to_i(base = 10)
  %x{
    var result,
        string = self.toLowerCase(),
        radix = #{Opal.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_proc ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1245

def to_proc
  # Give name to self in case this proc is passed to instance_eval
  sym = self

  proc do |*args, &block|
    raise ArgumentError, "no receiver given" if args.empty?
    obj = args.shift
    obj.__send__(sym, *args, &block)
  end
end

#to_s ⇒ Object Also known as: to_str 



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# File 'opal/opal/corelib/string.rb', line 1256

def to_s
  `self.toString()`
end

#tr(from, to) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1264

def tr(from, to)
  from = Opal.coerce_to(from, String, :to_str).to_s
  to = Opal.coerce_to(to, String, :to_str).to_s
  %x{
    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_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 = ''
    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 new_str;
  }
end

#tr! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 77

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

#tr_s(from, to) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1408

def tr_s(from, to)
  from = Opal.coerce_to(from, String, :to_str).to_s
  to = Opal.coerce_to(to, String, :to_str).to_s
  %x{
    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 new_str;
  }
end

#tr_s! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 81

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

#upcase ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1570

def upcase
  `self.toUpperCase()`
end

#upcase! ⇒ Object

Raises:



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# File 'opal/opal/corelib/unsupported.rb', line 85

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

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



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# File 'opal/opal/corelib/string.rb', line 1574

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

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

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

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

        value = block(String.fromCharCode(a));
        if (value === $breaker) { return $breaker.$v; }

        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;
        }

        value = block(a.toString());
        if (value === $breaker) { return $breaker.$v; }

        a += 1;
      }

    } else {

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

        value = block(s);
        if (value === $breaker) { return $breaker.$v; }

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

    }
    return self;
  }
end