Class: PuppetX::IniFile::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/puppet_x/twp/inifile.rb

Overview

The IniFile::Parser has the responsibility of reading the contents of an .ini file and storing that information into a ruby Hash. The object being parsed must respond to ‘each_line` - this includes Strings and any IO object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(hash, param, comment, default) ⇒ Parser

Create a new IniFile::Parser that can be used to parse the contents of an .ini file.

hash - The Hash where parsed information will be stored param - String used to separate parameter and value comment - String containing the comment character(s) default - The String name of the default global section



426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
 
# File 'lib/puppet_x/twp/inifile.rb', line 426

def initialize(hash, param, comment, default)
  @hash = hash
  @default = default

  comment = comment.to_s.empty? ? '\\z' : "\\s*(?:[#{comment}].*)?\\z"

  @section_regexp  = %r{\A\s*\[([^\]]+)\]#{comment}}
  @ignore_regexp   = %r{\A#{comment}}
  @property_regexp = %r{\A(.*?)(?<!\\)#{param}(.*)\z}

  @open_quote      = %r{\A\s*(".*)\z}
  @close_quote     = %r{\A(.*(?<!\\)")#{comment}}
  @full_quote      = %r{\A\s*(".*(?<!\\)")#{comment}}
  @trailing_slash  = %r{\A(.*)(?<!\\)\\#{comment}}
  @normal_value    = %r{\A(.*?)#{comment}}
end

Instance Attribute Details

#property ⇒ Object

Returns the value of attribute property.



415
416
417
 
# File 'lib/puppet_x/twp/inifile.rb', line 415

def property
  @property
end

#section ⇒ Object

Returns the current section Hash.



573
574
575
 
# File 'lib/puppet_x/twp/inifile.rb', line 573

def section
  @section ||= @hash[@default]
end

#value ⇒ Object

Returns the value of attribute value.



416
417
418
 
# File 'lib/puppet_x/twp/inifile.rb', line 416

def value
  @value
end

Instance Method Details

#error(msg = 'Could not parse line') ⇒ Object

Raise a parse error using the given message and appending the current line being parsed.

msg - The message String to use.

Raises IniFile::Error

Raises:



583
584
585
 
# File 'lib/puppet_x/twp/inifile.rb', line 583

def error(msg = 'Could not parse line')
  raise Error, "#{msg}: #{@line.inspect}"
end

#leading_quote? ⇒ Boolean

Returns ‘true` if the current value starts with a leading double quote. Otherwise returns false.

Returns:

  • (Boolean) 


445
446
447
448
449
 
# File 'lib/puppet_x/twp/inifile.rb', line 445

def leading_quote?
  # rubocop:disable Performance/StartWith
  value && value =~ %r{\A"}
  # rubocop:enable Performance/StartWith
end

#parse(content) ⇒ Object

Parse the ini file contents. This will clear any values currently stored in the ini hash.

content - Any object that responds to ‘each_line`

Returns nil.



512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
 
# File 'lib/puppet_x/twp/inifile.rb', line 512

def parse(content)
  return unless content

  continuation = false

  @hash.clear
  @line = nil
  self.section = nil

  content.each_line do |line|
    @line = line.chomp

    if continuation
      continuation = parse_value @line
    else
      case @line
      when @ignore_regexp
        nil
      when @section_regexp
        self.section = @hash[Regexp.last_match(1)]
      when @property_regexp
        self.property = Regexp.last_match(1).strip
        error if property.empty?

        continuation = parse_value Regexp.last_match(2)
      else
        error
      end
    end
  end

  # check here if we have a dangling value ... usually means we have an
  # unmatched open quote
  if leading_quote?
    error 'Unmatched open quote'
  elsif property && value
    process_property
  elsif value
    error
  end

  nil
end

#parse_value(string) ⇒ Object

Given a string, attempt to parse out a value from that string. This value might be continued on the following line. So this method returns ‘true` if it is expecting more data.

string - String to parse

Returns ‘true` if the next line is also part of the current value. Returns `fase` if the string contained a complete value.



459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
 
# File 'lib/puppet_x/twp/inifile.rb', line 459

def parse_value(string)
  continuation = false

  # if our value starts with a double quote, then we are in a
  # line continuation situation
  if leading_quote?
    # check for a closing quote at the end of the string
    if string =~ @close_quote
      value << Regexp.last_match(1)

    # otherwise just append the string to the value
    else
      value << string
      continuation = true
    end

  # not currently processing a continuation line
  else
    case string
    when @full_quote
      self.value = Regexp.last_match(1)

    when @open_quote
      self.value = Regexp.last_match(1)
      continuation = true

    when @trailing_slash
      value ? value << Regexp.last_match(1) : self.value = Regexp.last_match(1)
      continuation = true

    when @normal_value
      value ? value << Regexp.last_match(1) : self.value = Regexp.last_match(1)

    else
      error
    end
  end

  if continuation
    value << $RS if leading_quote?
  else
    process_property
  end

  continuation
end

#process_property ⇒ Object

Store the property/value pair in the currently active section. This method checks for continuation of the value to the next line.

Returns nil.



560
561
562
563
564
565
566
567
568
569
570
 
# File 'lib/puppet_x/twp/inifile.rb', line 560

def process_property
  property.strip!
  value.strip!

  self.value = Regexp.last_match(1) if value =~ %r{\A"(.*)(?<!\\)"\z}m

  section[property] = typecast(value)

  self.property = nil
  self.value = nil
end

#typecast(value) ⇒ Object

Attempt to typecast the value string. We are looking for boolean values, integers, floats, and empty strings. Below is how each gets cast, but it is pretty logical and straightforward.

"true"  -->  true
"false" -->  false
""      -->  nil
"42"    -->  42
"3.14"  -->  3.14
"foo"   -->  "foo"

Returns the typecast value.



599
600
601
602
603
604
605
606
607
608
609
 
# File 'lib/puppet_x/twp/inifile.rb', line 599

def typecast(value)
  case value
  when %r{\Atrue\z}i then  true
  when %r{\Afalse\z}i then false
  when %r{\A\s*\z}i then nil
  else
    # rubocop:disable Style/RescueModifier
    Integer(value) rescue Float(value) rescue unescape_value(value)
    # rubocop:enable Style/RescueModifier
  end
end

#unescape_value(value) ⇒ Object

Unescape special characters found in the value string. This will convert escaped null, tab, carriage return, newline, and backslash into their literal equivalents.

value - The String value to unescape.

Returns the unescaped value.



618
619
620
621
622
623
624
625
626
627
628
629
630
 
# File 'lib/puppet_x/twp/inifile.rb', line 618

def unescape_value(value)
  value = value.to_s
  value.gsub!(%r{\\[0nrt\\]}) do |char|
    case char
    when '\0' then "\0"
    when '\n' then "\n"
    when '\r' then "\r"
    when '\t' then "\t"
    when '\\\\' then '\\'
    end
  end
  value
end