Class: Sexp2Ruby::Node::Call

Inherits:
Base
  • Object
show all
Defined in:
lib/sexp2ruby/node/call.rb

Overview

A method call.

Examples:

“‘ a s(:call, nil, :a)

A.b s(:call, s(:const, :A), :b)

a(b) s(:call, nil, :a, s(:call, nil, :b))

a(b, c: d, &e) s(

:call,
nil,
:a,
s(:call, nil, :b),
s(:hash, s(:lit, :c), s(:call, nil, :d)),
s(:block_pass, s(:call, nil, :e))

)

a = :a; a.b s(

:block,
s(:lasgn, :a, s(:lit, :a)),
s(:call, s(:lvar, :a), :b)

) “‘

Constant Summary collapse

BINARY =

binary operation messages

[:<=>, :==, :<, :>, :<=, :>=, :-, :+, :*, :/, :%, :<<, :>>, :**, :'!=']

Constants inherited from Base

Base::ASSIGN_NODES, Base::LF, Base::LINE_LENGTH

Instance Attribute Summary

Attributes inherited from Base

#processor

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from Sexp2Ruby::Node::Base

Instance Method Details

#arguments?(exp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sexp2ruby/node/call.rb', line 38

def arguments?(exp)
  exp.length > 2 # 1. receiver, 2. method name, 3+ arguments
end

#to_s(exp) ⇒ Object 



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# File 'lib/sexp2ruby/node/call.rb', line 42

def to_s(exp)
  receiver_node_type = exp.first.nil? ? nil : exp.first.first
  receiver = process exp.shift
  receiver = "(#{receiver})" if ASSIGN_NODES.include? receiver_node_type

  name = exp.shift
  args = []

  # this allows us to do both old and new sexp forms:
  exp.push(*exp.pop[1..-1]) if exp.size == 1 && exp.first.first == :arglist

  call_push(name)

  in_context :arglist do
    until exp.empty? do
      arg_type = exp.first.sexp_type
      is_empty_hash = (exp.first == s(:hash))
      arg = process exp.shift

      next if arg.empty?

      strip_hash = (arg_type == :hash and
        not BINARY.include? name and
        not is_empty_hash and
        (exp.empty? or exp.first.sexp_type == :splat))
      wrap_arg = ASSIGN_NODES.include? arg_type

      arg = arg[2..-3] if strip_hash
      arg = "(#{arg})" if wrap_arg

      args << arg
    end
  end

  case name
  when *BINARY then
    "(#{receiver} #{name} #{args.join(', ')})"
  when :[] then
    receiver ||= "self"
    "#{receiver}[#{args.join(', ')}]"
  when :[]= then
    receiver ||= "self"
    rhs = args.pop
    "#{receiver}[#{args.join(', ')}] = #{rhs}"
  when :"!" then
    "(not #{receiver})"
  when :"-@" then
    "-#{receiver}"
  when :"+@" then
    "+#{receiver}"
  else
    args = arguments(args, name)
    receiver = "#{receiver}." if receiver
    "#{receiver}#{name}#{args}"
  end
ensure
  call_pop
end