Class: Regexp

Inherits:
Object show all
Defined in:
opal/opal/corelib/regexp.rb,
opal/opal/corelib/marshal/write_buffer.rb

Constant Summary collapse

IGNORECASE = 
1
EXTENDED = 
2
MULTILINE = 
4

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.allocate ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 13

def allocate
  allocated = super
  `#{allocated}.uninitialized = true`
  allocated
end

.escape(string) ⇒ Object Also known as: quote 



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

def escape(string)
  `Opal.escape_regexp(string)`
end

.last_match(n = nil) ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 23

def last_match(n = nil)
  if n.nil?
    $~
  elsif $~
    $~[n]
  end
end

.new(regexp, options = undefined) ⇒ Object Also known as: compile 



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# File 'opal/opal/corelib/regexp.rb', line 76

def new(regexp, options = undefined)
  %x{
    if (regexp.$$is_regexp) {
      return new RegExp(regexp);
    }

    regexp = #{Opal.coerce_to!(regexp, String, :to_str)};

    if (regexp.charAt(regexp.length - 1) === '\\' && regexp.charAt(regexp.length - 2) !== '\\') {
      #{raise RegexpError, "too short escape sequence: /#{regexp}/"}
    }

    if (options === undefined || #{!options}) {
      return new RegExp(regexp);
    }

    if (options.$$is_number) {
      var temp = '';
      if (#{IGNORECASE} & options) { temp += 'i'; }
      if (#{MULTILINE}  & options) { temp += 'm'; }
      options = temp;
    }
    else {
      options = 'i';
    }

    return new RegExp(regexp, options);
  }
end

.union(*parts) ⇒ Object 



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

def union(*parts)
  %x{
    var is_first_part_array, quoted_validated, part, options, each_part_options;
    if (parts.length == 0) {
      return /(?!)/;
    }
    // return fast if there's only one element
    if (parts.length == 1 && parts[0].$$is_regexp) {
      return parts[0];
    }
    // cover the 2 arrays passed as arguments case
    is_first_part_array = parts[0].$$is_array;
    if (parts.length > 1 && is_first_part_array) {
      #{raise TypeError, 'no implicit conversion of Array into String'}
    }
    // deal with splat issues (related to https://github.com/opal/opal/issues/858)
    if (is_first_part_array) {
      parts = parts[0];
    }
    options = undefined;
    quoted_validated = [];
    for (var i=0; i < parts.length; i++) {
      part = parts[i];
      if (part.$$is_string) {
        quoted_validated.push(#{escape(`part`)});
      }
      else if (part.$$is_regexp) {
        each_part_options = #{`part`.options};
        if (options != undefined && options != each_part_options) {
          #{raise TypeError, 'All expressions must use the same options'}
        }
        options = each_part_options;
        quoted_validated.push('('+part.source+')');
      }
      else {
        quoted_validated.push(#{escape(`part`.to_str)});
      }
    }
  }
  # Take advantage of logic that can parse options from JS Regex
  new(`quoted_validated`.join('|'), `options`)
end

Instance Method Details

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



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# File 'opal/opal/corelib/regexp.rb', line 109

def ==(other)
  `other instanceof RegExp && self.toString() === other.toString()`
end

#===(string) ⇒ Object 



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

def ===(string)
  `#{match(Opal.coerce_to?(string, String, :to_str))} !== nil`
end

#=~(string) ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 117

def =~(string)
  match(string) && $~.begin(0)
end

#__marshal__(buffer) ⇒ Object 



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# File 'opal/opal/corelib/marshal/write_buffer.rb', line 83

def __marshal__(buffer)
  buffer.save_link(self)
  buffer.write_ivars_prefix(self)
  buffer.write_extends(self)
  buffer.write_user_class(Regexp, self)
  buffer.append('/')
  buffer.write_regexp(self)
  buffer.write_ivars_suffix(self)
end

#casefold? ⇒ Boolean

Returns:



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# File 'opal/opal/corelib/regexp.rb', line 287

def casefold?
  `self.ignoreCase`
end

#inspect ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 123

def inspect
  # Use a regexp to extract the regular expression and the optional mode modifiers from the string.
  # In the regular expression, escape any front slash (not already escaped) with a backslash.
  %x{
    var regexp_format = /^\/(.*)\/([^\/]*)$/;
    var value = self.toString();
    var matches = regexp_format.exec(value);
    if (matches) {
      var regexp_pattern = matches[1];
      var regexp_flags = matches[2];
      var chars = regexp_pattern.split('');
      var chars_length = chars.length;
      var char_escaped = false;
      var regexp_pattern_escaped = '';
      for (var i = 0; i < chars_length; i++) {
        var current_char = chars[i];
        if (!char_escaped && current_char == '/') {
          regexp_pattern_escaped = regexp_pattern_escaped.concat('\\');
        }
        regexp_pattern_escaped = regexp_pattern_escaped.concat(current_char);
        if (current_char == '\\') {
          if (char_escaped) {
            // does not over escape
            char_escaped = false;
          } else {
            char_escaped = true;
          }
        } else {
          char_escaped = false;
        }
      }
      return '/' + regexp_pattern_escaped + '/' + regexp_flags;
    } else {
      return value;
    }
  }
end

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



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# File 'opal/opal/corelib/regexp.rb', line 161

def match(string, pos = undefined, &block)
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }

    if (pos === undefined) {
      if (string === nil) return #{$~ = nil};
      var m = self.exec($coerce_to(string, #{String}, 'to_str'));
      if (m) {
        #{$~ = MatchData.new(`self`, `m`)};
        return block === nil ? #{$~} : #{yield $~};
      } else {
        return #{$~ = nil};
      }
    }

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

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

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

    if (pos < 0) {
      pos += string.length;
      if (pos < 0) {
        return #{$~ = nil};
      }
    }

    // global RegExp maintains state, so not using self/this
    var md, re = Opal.global_regexp(self);

    while (true) {
      md = re.exec(string);
      if (md === null) {
        return #{$~ = nil};
      }
      if (md.index >= pos) {
        #{$~ = MatchData.new(`re`, `md`)};
        return block === nil ? #{$~} : #{yield $~};
      }
      re.lastIndex = md.index + 1;
    }
  }
end

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

Returns:



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# File 'opal/opal/corelib/regexp.rb', line 210

def match?(string, pos = undefined)
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }

    if (pos === undefined) {
      return string === nil ? false : self.test($coerce_to(string, #{String}, 'to_str'));
    }

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

    if (string === nil) {
      return false;
    }

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

    if (pos < 0) {
      pos += string.length;
      if (pos < 0) {
        return false;
      }
    }

    // global RegExp maintains state, so not using self/this
    var md, re = Opal.global_regexp(self);

    md = re.exec(string);
    if (md === null || md.index < pos) {
      return false;
    } else {
      return true;
    }
  }
end

#named_captures ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 251

def named_captures
  source.scan(/\(?<(\w+)>/, no_matchdata: true) # Scan for capture groups
        .map(&:first)                           # Get the first regexp match (\w+)
        .each_with_index                        # Add index to an iterator
        .group_by(&:first)                      # Group by the capture group names
        .transform_values do |i|                # Convert hash values
          i.map { |j| j.last + 1 }              # Drop the capture group names; increase indexes by 1
        end
end

#names ⇒ Object 



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

def names
  source.scan(/\(?<(\w+)>/, no_matchdata: true).map(&:first).uniq
end

#options ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 269

def options
  # Flags would be nice to use with this, but still experimental - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags
  %x{
    if (self.uninitialized) {
      #{raise TypeError, 'uninitialized Regexp'}
    }
    var result = 0;
    // should be supported in IE6 according to https://msdn.microsoft.com/en-us/library/7f5z26w4(v=vs.94).aspx
    if (self.multiline) {
      result |= #{MULTILINE};
    }
    if (self.ignoreCase) {
      result |= #{IGNORECASE};
    }
    return result;
  }
end

#source ⇒ Object Also known as: to_s 



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

def source
  `self.source`
end

#~ ⇒ Object 



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

def ~
  self =~ $_
end