Class: Regexgen::Ast::Concatenation

Inherits:
Object
  • Object
show all
Defined in:
lib/regexgen/ast.rb

Overview

Represents a concatenation (e.g. ‘foo`)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(a, b) ⇒ Concatenation

Returns a new instance of Concatenation.



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# File 'lib/regexgen/ast.rb', line 91

def initialize(a, b)
  @precedence = 2
  @a = a
  @b = b
end

Instance Attribute Details

#a ⇒ Object (readonly)

Returns the value of attribute a.



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# File 'lib/regexgen/ast.rb', line 89

def a
  @a
end

#b ⇒ Object (readonly)

Returns the value of attribute b.



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# File 'lib/regexgen/ast.rb', line 89

def b
  @b
end

#precedence ⇒ Object (readonly)

Returns the value of attribute precedence.



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# File 'lib/regexgen/ast.rb', line 89

def precedence
  @precedence
end

Instance Method Details

#length ⇒ Object 



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# File 'lib/regexgen/ast.rb', line 97

def length
  @a.length + @b.length
end

#literal(side) ⇒ Object 



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# File 'lib/regexgen/ast.rb', line 105

def literal(side)
  return @a.literal(side) if side == :start && @a.respond_to?(:literal)

  @b.literal(side) if side == :end && @b.respond_to?(:literal)
end

#remove_substring(side, len) ⇒ Object 



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# File 'lib/regexgen/ast.rb', line 111

def remove_substring(side, len)
  a = @a
  b = @b
  a = @a.remove_substring(side, len) if side == :start && @a.respond_to?(:remove_substring)
  b = @b.remove_substring(side, len) if side == :end && @b.respond_to?(:remove_substring)

  return b if a.respond_to?(:empty?) && a.empty?
  return a if b.respond_to?(:empty?) && b.empty?

  Concatenation.new(a, b)
end

#to_s ⇒ Object 



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# File 'lib/regexgen/ast.rb', line 101

def to_s
  Ast.parens(@a, self) + Ast.parens(@b, self)
end