Class: StringScanner

Inherits:
Object show all
Defined in:
opal/stdlib/strscan.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string) ⇒ StringScanner

Returns a new instance of StringScanner



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# File 'opal/stdlib/strscan.rb', line 5

def initialize(string)
  @string  = string
  @pos     = 0
  @matched = nil
  @working = string
  @match = []
end

Instance Attribute Details

#matched ⇒ Object (readonly)

Returns the value of attribute matched



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# File 'opal/stdlib/strscan.rb', line 3

def matched
  @matched
end

#pos ⇒ Object

Returns the value of attribute pos



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# File 'opal/stdlib/strscan.rb', line 2

def pos
  @pos
end

Instance Method Details

#[](idx) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 46

def [](idx)
  %x{
    var match = #@match;

    if (idx < 0) {
      idx += match.length;
    }

    if (idx < 0 || idx >= match.length) {
      return nil;
    }

    return match[idx];
  }
end

#bol? ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 13

def bol?
  `#@pos === 0 || #@string.charAt(#@pos - 1) === "\\n"`
end

#check(regex) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 62

def check(regex)
  %x{
    var regexp = new RegExp('^' + regex.toString().substring(1, regex.toString().length - 1)),
        result = regexp.exec(#@working);

    if (result == null) {
      return #{self}.matched = nil;
    }

    return #{self}.matched = result[0];
  }
end

#eos? ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 79

def eos?
  `#@working.length === 0`
end

#get_byte ⇒ Object Also known as: getch 



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# File 'opal/stdlib/strscan.rb', line 103

def get_byte()
  %x{
    var result = nil;
    if (#{self}.pos < #{self}.string.length) {
      self.prev_pos = self.pos;
      #{self}.pos += 1;
      result = #{self}.matched = #{self}.working.substring(0, 1);
      #{self}.working = #{self}.working.substring(1);
    }
    else {
      #{self}.matched = nil;
    }

    return result;
  }
end

#peek(length) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 75

def peek(length)
  `#@working.substring(0, length)`
end

#rest ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 134

def rest
  @working
end

#scan(regex) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 17

def scan(regex)
  %x{
    var regex  = new RegExp('^' + regex.toString().substring(1, regex.toString().length - 1)),
        result = regex.exec(#@working);

    if (result == null) {
      return #{self}.matched = nil;
    }
    else if (typeof(result) === 'object') {
      #@prev_pos = #@pos;
      #@pos      += result[0].length;
      #@working  = #@working.substring(result[0].length);
      #@matched  = result[0];
      #@match    = result;

      return result[0];
    }
    else if (typeof(result) === 'string') {
      #@pos     += result.length;
      #@working  = #@working.substring(result.length);

      return result;
    }
    else {
      return nil;
    }
  }
end

#skip(re) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 83

def skip(re)
  %x{
    re = new RegExp('^' + re.source)
    var result = re.exec(#@working);

    if (result == null) {
      return #{self}.matched = nil;
    }
    else {
      var match_str = result[0];
      var match_len = match_str.length;
      #{self}.matched = match_str;
      self.prev_pos = self.pos;
      #{self}.pos += match_len;
      #{self}.working = #{self}.working.substring(match_len);
      return match_len;
    }
  }
end

#terminate ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 138

def terminate
  @match = nil
  self.pos = @string.length
end

#unscan ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 143

def unscan
  @pos = @prev_pos
  @prev_pos = nil
  @match = nil
  self
end