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

#string ⇒ Object (readonly)

Returns the value of attribute string



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

def string
  @string
end

Instance Method Details

#[](idx) ⇒ Object 



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

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

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

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

    if (match[idx] == null) {
      return nil;
    }

    return match[idx];
  }
end

#beginning_of_line? ⇒ Boolean Also known as: bol?

Returns:



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# File 'opal/stdlib/strscan.rb', line 15

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

#check(pattern) ⇒ Object 



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

def check(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

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

    return #@matched = result[0];
  }
end

#check_until(pattern) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 117

def check_until(pattern)
  %x{
    var prev_pos = #@prev_pos,
        pos      = #@pos;

    var result = #{scan_until(pattern)};

    if (result !== nil) {
      #@matched = result.substr(-1);
      #@working = #@string.substr(pos);
    }

    #@prev_pos = prev_pos;
    #@pos      = pos;

    return result;
  }
end

#eos? ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 140

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

#exist?(pattern) ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 144

def exist?(pattern)
  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return nil;
    }
    else if (result.index == 0) {
      return 0;
    }
    else {
      return result.index + 1;
    }
  }
end

#get_byte ⇒ Object Also known as: getch 



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# File 'opal/stdlib/strscan.rb', line 198

def get_byte
  %x{
    var result = nil;

    if (#@pos < #@string.length) {
      #@prev_pos  = #@pos;
      #@pos      += 1;
      result      = #@matched = #@working.substring(0, 1);
      #@working   = #@working.substring(1);
    }
    else {
      #@matched = nil;
    }

    return result;
  }
end

#match?(pattern) ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 219

def match?(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return nil;
    }
    else {
      #@prev_pos = #@pos;

      return result[0].length;
    }
  }
end

#peek(length) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 136

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

#post_match ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 247

def post_match
  %x{
    if (#@matched === nil) {
      return nil;
    }

    return #@string.substr(#@pos);
  }
end

#pre_match ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 257

def pre_match
  %x{
    if (#@matched === nil) {
      return nil;
    }

    return #@string.substr(0, #@prev_pos);
  }
end

#reset ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 267

def reset
  @working = @string
  @matched = nil
  @pos     = 0
end

#rest ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 273

def rest
  @working
end

#rest? ⇒ Boolean

Returns:



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# File 'opal/stdlib/strscan.rb', line 277

def rest?
  `#@working.length !== 0`
end

#rest_size ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 281

def rest_size
  rest.size
end

#scan(pattern) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 21

def scan(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return #@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

#scan_until(pattern) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 51

def scan_until(pattern)
  pattern = anchor(pattern)

  %x{
    var pos     = #@pos,
        working = #@working,
        result;

    while (true) {
      result   = pattern.exec(working);
      pos     += 1;
      working  = working.substr(1);

      if (result == null) {
        if (working.length === 0) {
          return #@matched = nil;
        }

        continue;
      }

      #@matched  = #@string.substr(#@pos, pos - #@pos - 1 + result[0].length);
      #@prev_pos = pos - 1;
      #@pos      = pos;
      #@working  = working.substr(result[0].length);

      return #@matched;
    }
  }
end

#skip(pattern) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 160

def skip(pattern)
  pattern = anchor(pattern)

  %x{
    var result = pattern.exec(#@working);

    if (result == null) {
      return #@matched = nil;
    }
    else {
      var match_str = result[0];
      var match_len = match_str.length;

      #@matched   = match_str;
      #@prev_pos  = #@pos;
      #@pos      += match_len;
      #@working   = #@working.substring(match_len);

      return match_len;
    }
  }
end

#skip_until(pattern) ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 183

def skip_until(pattern)
  %x{
    var result = #{scan_until(pattern)};

    if (result === nil) {
      return nil;
    }
    else {
      #@matched = result.substr(-1);

      return result.length;
    }
  }
end

#terminate ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 285

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

#unscan ⇒ Object 



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# File 'opal/stdlib/strscan.rb', line 290

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

  self
end