Class: Regexp

Inherits:
Object
  • Object
show all
Defined in:
opal/opal/corelib/regexp.rb

Constant Summary

IGNORECASE = 
1
MULTILINE = 
4

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

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



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

def escape(string)
  %x{
    return string.replace(/([-[\]\/{}()*+?.^$\\| ])/g, '\\$1')
                 .replace(/[\n]/g, '\\n')
                 .replace(/[\r]/g, '\\r')
                 .replace(/[\f]/g, '\\f')
                 .replace(/[\t]/g, '\\t');
  }
end

.last_match(n = nil) ⇒ Object 



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

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

.new(regexp, options = undefined) ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 68

def new(regexp, options = undefined)      
  %x{
    // Play nice with IE8
    if (regexp.$$is_string && regexp.substr(regexp.length-1, 1) == "\\") {
      #{raise RegexpError, "too short escape sequence: /#{regexp}/"}
    }
    
    if (options == undefined || #{!options}) {
      options = undefined;
    }
    
    if (options != undefined) {
      if (regexp.$$is_regexp) {
        // options are already in regex
        options = undefined;
      }
      else if (options.$$is_number) {
        var result = '';
        if (#{IGNORECASE} & options) {
          result += 'i';
        }
        if (#{MULTILINE} & options) {
          result += 'm';
        }
        options = result;
      }
      else {
        options = 'i';
      }
    }       
    
    return new RegExp(regexp, options);
  }
end

.union(*parts) ⇒ Object 



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

def union(*parts)
  %x{
    var is_first_part_array, quoted_validated, part, options, each_part_options;
    if (parts.length == 0) {
      return /(?!)/;
    }
    // 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 104

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

#===(string) ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 108

def ===(string)
  `#{match(string)} !== nil`
end

#=~(string) ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 112

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

#inspect ⇒ Object 



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

def inspect
  `self.toString()`
end

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



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# File 'opal/opal/corelib/regexp.rb', line 122

def match(string, pos = undefined, &block)
  %x{
    if (pos === undefined) {
      pos = 0;
    } else {
      pos = #{Opal.coerce_to(pos, Integer, :to_int)};
    }

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

    string = #{Opal.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 = new RegExp(self.source, 'gm' + (self.ignoreCase ? 'i' : ''));

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

#options ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 168

def options
  # https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags is still experimental
  # we need the flags and source does not give us that
  %x{
    var as_string, text_flags, result, text_flag;
    as_string = self.toString();
    if (as_string == "/(?:)/") {
      #{raise TypeError, 'uninitialized Regexp'}
    }
    text_flags = as_string.replace(self.source, '').match(/\w+/);
    result = 0;
    // may have no flags
    if (text_flags == null) {
      return result;
    }
    // first match contains all of our flags
    text_flags = text_flags[0];
    for (var i=0; i < text_flags.length; i++) {
      text_flag = text_flags[i];
      switch(text_flag) {
        case 'i':
          result |= #{IGNORECASE};
          break;
        case 'm':
          result |= #{MULTILINE};
          break;
        default:
          #{raise "RegExp flag #{`text_flag`} does not have a match in Ruby"}
      }
    }
    
    return result;
  }  
end

#source ⇒ Object Also known as: to_s 



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# File 'opal/opal/corelib/regexp.rb', line 164

def source
  `self.source`
end

#~ ⇒ Object 



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# File 'opal/opal/corelib/regexp.rb', line 160

def ~
  self =~ $_
end