Class: RLSM::RE::Concat

Inherits:

SyntaxNode

• Object
• SyntaxNode
• RLSM::RE::Concat

Defined in:

lib/rlsm/regexp_parser.rb

Overview

:nodoc:

Instance Attribute Summary

Attributes inherited from SyntaxNode

#content

Instance Method Summary

• #first ⇒ Object
• #follow ⇒ Object
• #last ⇒ Object
• #null? ⇒ Boolean
• #to_s ⇒ Object

Methods inherited from SyntaxNode

#<=>, [], #initialize, #inspect

Constructor Details

This class inherits a constructor from RLSM::RE::SyntaxNode

Instance Method Details

#first ⇒ Object

# File 'lib/rlsm/regexp_parser.rb', line 399

def first
  result = []
  @content.each do |subexpr|
    result << subexpr.first
    break unless subexpr.null?
  end

  result.flatten.sort
end

#follow ⇒ Object

# File 'lib/rlsm/regexp_parser.rb', line 419

def follow
  result = []

  (@content.size-1).times do |i|
    result |= @content[i].follow
    @content[i].last.each do |char1|
      @content[i+1].first.each do |char2|
        result << [char1, char2]
      end
    end
  end

  result |= @content[-1].follow

  result.sort
end

#last ⇒ Object

# File 'lib/rlsm/regexp_parser.rb', line 409

def last
  result = []
  @content.reverse.each do |subexpr|
    result << subexpr.last
    break unless subexpr.null?
  end

  result.flatten.sort
end

#null? ⇒ Boolean

Returns:

• (Boolean)

# File 'lib/rlsm/regexp_parser.rb', line 395

def null?
  @content.all? { |subexpr| subexpr.null? }
end

#to_s ⇒ Object

# File 'lib/rlsm/regexp_parser.rb', line 436

def to_s
  string = ''
  
  @content.each do |subexpr|
    if Union === subexpr
      string += "(#{subexpr.to_s})"
    else
      string += subexpr.to_s
    end
  end

  string
end