Class: Packcr::Node::PredicateNode

Inherits:
Packcr::Node show all
Defined in:
lib/packcr/node/predicate_node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Packcr::Node

#alt, #seq, #setup_rule

Constructor Details

#initialize(expr = nil, neg = false) ⇒ PredicateNode

Returns a new instance of PredicateNode.



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# File 'lib/packcr/node/predicate_node.rb', line 6

def initialize(expr = nil, neg = false)
  super()
  @expr = expr
  @neg = neg
end

Instance Attribute Details

#expr ⇒ Object

Returns the value of attribute expr.



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# File 'lib/packcr/node/predicate_node.rb', line 4

def expr
  @expr
end

#neg ⇒ Object

Returns the value of attribute neg.



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# File 'lib/packcr/node/predicate_node.rb', line 4

def neg
  @neg
end

Instance Method Details

#debug_dump(indent = 0) ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 12

def debug_dump(indent = 0)
  $stdout.print "#{" " * indent}Predicate(neg:#{neg ? 1 : 0}) {\n"
  expr.debug_dump(indent + 2)
  $stdout.print "#{" " * indent}}\n"
end

#generate_code(gen, onfail, indent, bare) ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 18

def generate_code(gen, onfail, indent, bare)
  r = nil
  if neg
    l = gen.next_label
    r, code = gen.generate_code_str(expr, l, 4, false)
    gen.write Packcr.template("node/predicate_neg.#{gen.lang}.erb", binding, indent: indent, unwrap: bare)
    case r
    when Packcr::CODE_REACH__ALWAYS_SUCCEED
      r = Packcr::CODE_REACH__ALWAYS_FAIL
    when Packcr::CODE_REACH__ALWAYS_FAIL
      r = Packcr::CODE_REACH__ALWAYS_SUCCEED
    end
  else
    l = gen.next_label
    m = gen.next_label
    r, code = gen.generate_code_str(expr, l, 4, false)
    gen.write Packcr.template("node/predicate.#{gen.lang}.erb", binding, indent: indent, unwrap: bare)
  end
  return r
end

#link_references(ctx) ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 47

def link_references(ctx)
  expr.link_references(ctx)
end

#nodes ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 51

def nodes
  [expr]
end

#verify_captures(ctx, capts) ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 43

def verify_captures(ctx, capts)
  expr.verify_captures(ctx, capts)
end

#verify_variables(vars) ⇒ Object 



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# File 'lib/packcr/node/predicate_node.rb', line 39

def verify_variables(vars)
  expr.verify_variables(vars)
end