Class: String

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
opal/opal/corelib/string.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

Class Method Details

.inherited(klass) ⇒ Object 



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# File 'opal/opal/corelib/string/inheritance.rb', line 2

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

  %x{
    klass._proto        = replace._proto;
    klass._proto._klass = 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 14

def self.new(str = '')
  `new String(str)`
end

.try_convert(what) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 8

def self.try_convert(what)
  what.to_str
rescue
  nil
end

Instance Method Details

#%(data) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 18

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 26

def *(count)
  %x{
    if (count < 1) {
      return '';
    }

    var result  = '',
        pattern = self;

    while (count > 0) {
      if (count & 1) {
        result += pattern;
      }

      count >>= 1;
      pattern += pattern;
    }

    return result;
  }
end

#+(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 48

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

  `self + #{other.to_s}`
end

#<=>(other) ⇒ Object 



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

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 73

def ==(other)
  return false unless String === other

  `#{to_s} == #{other.to_s}`
end

#=~(other) ⇒ Object 



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

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

    return #{other =~ self};
  }
end

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



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# File 'opal/opal/corelib/string.rb', line 92

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

    if (index._isRange) {
      var exclude = index.exclude,
          length  = index.end,
          index   = index.begin;

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

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

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

      if (index > size) {
        return nil;
      }

      length = length - index;

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

      return self.substr(index, length);
    }

    if (index < 0) {
      index += self.length;
    }

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

      return self.substr(index, 1);
    }

    if (index > self.length || index < 0) {
      return nil;
    }

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

#capitalize ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 146

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

#casecmp(other) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 150

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

  `self.toLowerCase()` <=> `other.toLowerCase()`
end

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



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# File 'opal/opal/corelib/string.rb', line 156

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 174

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 180

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

#chop ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 204

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

#chr ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 221

def chr
  `self.charAt(0)`
end

#clone ⇒ Object Also known as: dup 



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# File 'opal/opal/corelib/string.rb', line 225

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

#count(str) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 237

def count(str)
  `(self.length - self.replace(new RegExp(str, 'g'), '').length) / str.length`
end

#downcase ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 243

def downcase
  `self.toLowerCase()`
end

#each_char(&block) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 247

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

  %x{
    for (var i = 0, length = self.length; i < length; i++) {
      #{yield `self.charAt(i)`};
    }
  }

  self
end

#each_line(separator = $/) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 259

def each_line(separator = $/)
  return split(separator) unless block_given?

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

    for (var i = 0, length = splitted.length; i < length; i++) {
      if (i < length - 1 || trailing) {
        #{yield `splitted[i] + separator`};
      }
      else {
        #{yield `splitted[i]`};
      }
    }
  }

  self
end

#empty? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 280

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

#end_with?(*suffixes) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 284

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

#freeze ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1188

def freeze
  self
end

#frozen? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 1192

def frozen?
  true
end

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



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# File 'opal/opal/corelib/string.rb', line 302

def gsub(pattern, replace = undefined, &block)
  if String === pattern || pattern.respond_to?(:to_str)
    pattern = /#{Regexp.escape(pattern.to_str)}/
  end

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

  %x{
    var pattern = pattern.toString(),
        options = pattern.substr(pattern.lastIndexOf('/') + 1) + 'g',
        regexp  = pattern.substr(1, pattern.lastIndexOf('/') - 1);

    self.$sub._p = block;
    return self.$sub(new RegExp(regexp, options), replace);
  }
end

#hash ⇒ Object 



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

def hash
  `self.toString()`
end

#hex ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 325

def hex
  to_i 16
end

#include?(other) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 329

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

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

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

#index(what, offset = nil) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 343

def index(what, offset = nil)
  if String === what
    what = what.to_s
  elsif what.respond_to? :to_str
    what = what.to_str.to_s
  elsif not Regexp === what
    raise TypeError, "type mismatch: #{what.class} given"
  end

  result = -1

  if offset
    offset = Opal.coerce_to offset, Integer, :to_int

    %x{
      var size = self.length;

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

      if (offset > size) {
        return nil;
      }
    }

    if Regexp === what
      result = (what =~ `self.substr(offset)`) || -1
    else
      result = `self.substr(offset).indexOf(what)`
    end

    %x{
      if (result !== -1) {
        result += offset;
      }
    }
  else
    if Regexp === what
      result = (what =~ self) || -1
    else
      result = `self.indexOf(what)`
    end
  end

  unless `result === -1`
    result
  end
end

#inspect ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 393

def inspect
  %x{
    var escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
        meta      = {
          '\b': '\\b',
          '\t': '\\t',
          '\n': '\\n',
          '\f': '\\f',
          '\r': '\\r',
          '"' : '\\"',
          '\\': '\\\\'
        };

    escapable.lastIndex = 0;

    return escapable.test(self) ? '"' + self.replace(escapable, function(a) {
      var c = meta[a];

      return typeof c === 'string' ? c :
        '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
    }) + '"' : '"' + self + '"';
  }
end

#intern ⇒ Object Also known as: to_sym 



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# File 'opal/opal/corelib/string.rb', line 417

def intern
  self
end

#length ⇒ Object Also known as: size 



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# File 'opal/opal/corelib/string.rb', line 425

def length
  `self.length`
end

#lines(separator = $/) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 421

def lines(separator = $/)
  each_line(separator).to_a
end

#ljust(width, padstr = ' ') ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 429

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 453

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

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



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# File 'opal/opal/corelib/string.rb', line 457

def match(pattern, pos = undefined, &block)
  if String === pattern || pattern.respond_to?(:to_str)
    pattern = /#{Regexp.escape(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 469

def next
  %x{
    if (self.length === 0) {
      return "";
    }

    var initial = self.substr(0, self.length - 1);
    var last    = String.fromCharCode(self.charCodeAt(self.length - 1) + 1);

    return initial + last;
  }
end

#ord ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 482

def ord
  `self.charCodeAt(0)`
end

#partition(str) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 486

def partition(str)
  %x{
    var result = self.split(str);
    var splitter = (result[0].length === self.length ? "" : str);

    return [result[0], splitter, result.slice(1).join(str.toString())];
  }
end

#reverse ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 495

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

#rindex(search, offset = undefined) ⇒ Object

TODO handle case where search is regexp



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# File 'opal/opal/corelib/string.rb', line 500

def rindex(search, offset = undefined)
  %x{
    var search_type = (search == null ? Opal.NilClass : search.constructor);
    if (search_type != String && search_type != RegExp) {
      var msg = "type mismatch: " + search_type + " given";
      #{raise TypeError.new(`msg`)};
    }

    if (self.length == 0) {
      return search.length == 0 ? 0 : nil;
    }

    var result = -1;
    if (offset != null) {
      if (offset < 0) {
        offset = self.length + offset;
      }

      if (search_type == String) {
        result = self.lastIndexOf(search, offset);
      }
      else {
        result = self.substr(0, offset + 1).$reverse().search(search);
        if (result !== -1) {
          result = offset - result;
        }
      }
    }
    else {
      if (search_type == String) {
        result = self.lastIndexOf(search);
      }
      else {
        result = self.$reverse().search(search);
        if (result !== -1) {
          result = self.length - 1 - result;
        }
      }
    }

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

#rjust(width, padstr = ' ') ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 544

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

#rstrip ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 564

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

#scan(pattern, &block) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 568

def scan(pattern, &block)
  %x{
    if (pattern.global) {
      // should we clear it afterwards too?
      pattern.lastIndex = 0;
    }
    else {
      // rewrite regular expression to add the global flag to capture pre/post match
      pattern = new RegExp(pattern.source, 'g' + (pattern.multiline ? 'm' : '') + (pattern.ignoreCase ? 'i' : ''));
    }

    var result = [];
    var match;

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

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

#split(pattern = $; || ' ', limit = undefined) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 600

def split(pattern = $; || ' ', limit = undefined)
  %x{
    if (pattern === nil || pattern === undefined) {
      pattern = #{$;};
    }

    var result = [];
    if (limit !== undefined) {
      limit = #{Opal.coerce_to!(limit, Integer, :to_int)};
    }

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

    if (limit === 1) {
      return [self];
    }

    if (pattern && pattern._isRegexp) {
      var pattern_str = pattern.toString();

      /* Opal and JS's repr of an empty RE. */
      var blank_pattern = (pattern_str.substr(0, 3) == '/^/') ||
                (pattern_str.substr(0, 6) == '/(?:)/');

      /* This is our fast path */
      if (limit === undefined || limit === 0) {
        result = self.split(blank_pattern ? /(?:)/ : pattern);
      }
      else {
        /* RegExp.exec only has sane behavior with global flag */
        if (! pattern.global) {
          pattern = eval(pattern_str + 'g');
        }

        var match_data;
        var prev_index = 0;
        pattern.lastIndex = 0;

        while ((match_data = pattern.exec(self)) !== null) {
          var segment = self.slice(prev_index, match_data.index);
          result.push(segment);

          prev_index = pattern.lastIndex;

          if (match_data[0].length === 0) {
            if (blank_pattern) {
              /* explicitly split on JS's empty RE form.*/
              pattern = /(?:)/;
            }

            result = self.split(pattern);
            /* with "unlimited", ruby leaves a trail on blanks. */
            if (limit !== undefined && limit < 0 && blank_pattern) {
              result.push('');
            }

            prev_index = undefined;
            break;
          }

          if (limit !== undefined && limit > 1 && result.length + 1 == limit) {
            break;
          }
        }

        if (prev_index !== undefined) {
          result.push(self.slice(prev_index, self.length));
        }
      }
    }
    else {
      var splitted = 0, start = 0, lim = 0;

      if (pattern === nil || pattern === undefined) {
        pattern = ' '
      } else {
        pattern = #{Opal.try_convert(pattern, String, :to_str).to_s};
      }

      var string = (pattern == ' ') ? self.replace(/[\r\n\t\v]\s+/g, ' ')
                                    : self;
      var cursor = -1;
      while ((cursor = string.indexOf(pattern, start)) > -1 && cursor < string.length) {
        if (splitted + 1 === limit) {
          break;
        }

        if (pattern == ' ' && cursor == start) {
          start = cursor + 1;
          continue;
        }

        result.push(string.substr(start, pattern.length ? cursor - start : 1));
        splitted++;

        start = cursor + (pattern.length ? pattern.length : 1);
      }

      if (string.length > 0 && (limit < 0 || string.length > start)) {
        if (string.length == start) {
          result.push('');
        }
        else {
          result.push(string.substr(start, string.length));
        }
      }
    }

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

    if (limit > 0) {
      var tail = result.slice(limit - 1).join('');
      result.splice(limit - 1, result.length - 1, tail);
    }

    return result;
  }
end

#squeeze(*sets) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 725

def squeeze(*sets)
  %x{
    if (sets.length === 0) {
      return self.replace(/(.)\1+/g, '$1');
    }
  }

  %x{
    var set = #{Opal.coerce_to(`sets[0]`, String, :to_str).chars};

    for (var i = 1, length = sets.length; i < length; i++) {
      set = #{`set` & Opal.coerce_to(`sets[i]`, String, :to_str).chars};
    }

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

    return self.replace(new RegExp("([" + #{Regexp.escape(`set`.join)} + "])\\1+", "g"), "$1");
  }
end

#start_with?(*prefixes) ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/string.rb', line 747

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 761

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

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



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# File 'opal/opal/corelib/string.rb', line 765

def sub(pattern, replace = undefined, &block)
  %x{
    if (typeof(replace) === 'string') {
      // convert Ruby back reference to JavaScript back reference
      replace = replace.replace(/\\([1-9])/g, '$$$1')
      return self.replace(pattern, replace);
    }
    if (block !== nil) {
      return self.replace(pattern, function() {
        // FIXME: this should be a formal MatchData object with all the goodies
        var match_data = []
        for (var i = 0, len = arguments.length; i < len; i++) {
          var arg = arguments[i];
          if (arg == undefined) {
            match_data.push(nil);
          }
          else {
            match_data.push(arg);
          }
        }

        var str = match_data.pop();
        var offset = match_data.pop();
        var match_len = match_data.length;

        // $1, $2, $3 not being parsed correctly in Ruby code
        //for (var i = 1; i < match_len; i++) {
        //  __gvars[String(i)] = match_data[i];
        //}
        #{$& = `match_data[0]`};
        #{$~ = `match_data`};
        return block(match_data[0]);
      });
    }
    else if (replace !== undefined) {
      if (#{replace.is_a?(Hash)}) {
        return self.replace(pattern, function(str) {
          var value = #{replace[str]};

          return (value == null) ? nil : #{value.to_s};
        });
      }
      else {
        replace = #{String.try_convert(replace)};

        if (replace == null) {
          #{raise TypeError, "can't convert #{replace.class} into String"};
        }

        return self.replace(pattern, replace);
      }
    }
    else {
      // convert Ruby back reference to JavaScript back reference
      replace = replace.toString().replace(/\\([1-9])/g, '$$$1')
      return self.replace(pattern, replace);
    }
  }
end

#sum(n = 16) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 827

def sum(n = 16)
  %x{
    var result = 0;

    for (var i = 0, length = self.length; i < length; i++) {
      result += (self.charCodeAt(i) % ((1 << n) - 1));
    }

    return result;
  }
end

#swapcase ⇒ Object 



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

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

#to_f ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 853

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 870

def to_i(base = 10)
  %x{
    var result = parseInt(self, base);

    if (isNaN(result)) {
      return 0;
    }

    return result;
  }
end

#to_proc ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 882

def to_proc
  proc do |recv, *args|
    recv.send(self, *args)
  end
end

#to_s ⇒ Object Also known as: to_str 



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# File 'opal/opal/corelib/string.rb', line 888

def to_s
  `self.toString()`
end

#tr(from, to) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 896

def tr(from, to)
  %x{
    if (from.length == 0 || from === to) {
      return self;
    }

    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] === '^') {
      inverse = true;
      from_chars.shift();
      global_sub = to_chars[to_length - 1]
      from_length -= 1;
    }

    var from_chars_expanded = [];
    var last_from = null;
    var in_range = false;
    for (var i = 0; i < from_length; i++) {
      var 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) {
        var start = last_from.charCodeAt(0) + 1;
        var end = ch.charCodeAt(0);
        for (var c = start; 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 (var i = 0; i < from_length; i++) {
        subs[from_chars[i]] = true;
      }
    }
    else {
      if (to_length > 0) {
        var to_chars_expanded = [];
        var last_to = null;
        var in_range = false;
        for (var i = 0; i < to_length; i++) {
          var 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) {
            var start = last_from.charCodeAt(0) + 1;
            var end = ch.charCodeAt(0);
            for (var c = start; 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 (var i = 0; i < length_diff; i++) {
          to_chars.push(pad_char);
        }
      }

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

    var new_str = ''
    for (var i = 0, length = self.length; i < length; i++) {
      var 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_s(from, to) ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1031

def tr_s(from, to)
  %x{
    if (from.length == 0) {
      return self;
    }

    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] === '^') {
      inverse = true;
      from_chars.shift();
      global_sub = to_chars[to_length - 1]
      from_length -= 1;
    }

    var from_chars_expanded = [];
    var last_from = null;
    var in_range = false;
    for (var i = 0; i < from_length; i++) {
      var 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) {
        var start = last_from.charCodeAt(0) + 1;
        var end = ch.charCodeAt(0);
        for (var c = start; 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 (var i = 0; i < from_length; i++) {
        subs[from_chars[i]] = true;
      }
    }
    else {
      if (to_length > 0) {
        var to_chars_expanded = [];
        var last_to = null;
        var in_range = false;
        for (var i = 0; i < to_length; i++) {
          var 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) {
            var start = last_from.charCodeAt(0) + 1;
            var end = ch.charCodeAt(0);
            for (var c = start; 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 (var i = 0; i < length_diff; i++) {
          to_chars.push(pad_char);
        }
      }

      for (var i = 0; i < from_length; i++) {
        subs[from_chars[i]] = to_chars[i];
      }
    }
    var new_str = ''
    var last_substitute = null
    for (var i = 0, length = self.length; i < length; i++) {
      var 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

#upcase ⇒ Object 



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# File 'opal/opal/corelib/string.rb', line 1184

def upcase
  `self.toUpperCase()`
end