Class: Fast::FindWithCapture

Inherits:
Find
  • Object
show all
Defined in:
lib/fast.rb

Overview

Allow use previous captures while searching in the AST. Use \\1 to point the match to the first captured element or sequential numbers considering the order of the captures.

Examples:

check comparision of integers that will always return true

ast = Fast.ast("1 == 1") => s(:send, s(:int, 1), :==, s(:int, 1))
Fast.match?("(send $(int _) == \1)", ast) # => [s(:int, 1)]

Instance Attribute Summary collapse

Attributes inherited from Find

#token

Instance Method Summary collapse

Methods inherited from Find

#==, #compare_symbol_or_head, #debug, #debug_match_recursive, #match_recursive

Constructor Details

#initialize(token) ⇒ FindWithCapture

Returns a new instance of FindWithCapture.



527
528
529
530
531
532
 
# File 'lib/fast.rb', line 527

def initialize(token)
  token = token.token if token.respond_to?(:token)
  raise 'You must use captures!' unless token

  @capture_index = token.to_i
end

Instance Attribute Details

#previous_captures=(value) ⇒ Object (writeonly)

Sets the attribute previous_captures

Parameters:

  • value —

    the value to set the attribute previous_captures to.



525
526
527
 
# File 'lib/fast.rb', line 525

def previous_captures=(value)
  @previous_captures = value
end

Instance Method Details

#match?(node) ⇒ Boolean

Returns:

  • (Boolean) 


534
535
536
 
# File 'lib/fast.rb', line 534

def match?(node)
  node == @previous_captures[@capture_index - 1]
end

#to_s ⇒ Object 



538
539
540
 
# File 'lib/fast.rb', line 538

def to_s
  "fc[\\#{@capture_index}]"
end