Class: Prattle::AST::KeywordSend

Inherits:
Node
  • Object
show all
Defined in:
lib/prattle/ast/keyword_send.rb

Defined Under Namespace

Classes: Pair

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Node

#run

Constructor Details

#initialize(receiver, name) ⇒ KeywordSend

Returns a new instance of KeywordSend



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# File 'lib/prattle/ast/keyword_send.rb', line 10

def initialize(receiver, name)
  @receiver = receiver
  @method_name = name
  @arguments = []
end

Instance Attribute Details

#argumentsObject (readonly)

Returns the value of attribute arguments



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# File 'lib/prattle/ast/keyword_send.rb', line 16

def arguments
  @arguments
end

#method_nameObject (readonly)

Returns the value of attribute method_name



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# File 'lib/prattle/ast/keyword_send.rb', line 16

def method_name
  @method_name
end

#receiverObject (readonly)

Returns the value of attribute receiver



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# File 'lib/prattle/ast/keyword_send.rb', line 16

def receiver
  @receiver
end

Class Method Details

.collect(pairs) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 20

def self.collect(pairs)
  name = ""
  args = []

  if pairs.kind_of? Array
    pairs.each do |pair|
      name << "#{pair.name}:"
      args << pair.value
    end
  else
    name << "#{pairs.name}:"
    args << pairs.value
  end

  [name, args]
end

.grammar(g) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 37

def self.grammar(g)
  g.name_var_pair = g.seq(g.t(:method_name), ":", :sp, g.t(:level3),
                          g.kleene(" ")) do |n,v|
    Pair.new(n,v)
  end

  g.send_args = g.many(:name_var_pair) do |*pairs|
    collect(pairs)
  end

  g.keyword_send = g.seq(:level3, :sig_sp, :send_args) do
                        |v,_,arg|

    s = new(v,arg.first)
    s.arguments.concat arg.last
    s
  end
end

.if_cond(g, name, args, if_true) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 56

def self.if_cond(g, name, args, if_true)
  return false unless args[0].kind_of? AST::Block

  done_lbl = g.new_label
  else_lbl = g.new_label

  if if_true
    g.gif else_lbl
  else
    g.git else_lbl
  end

  args[0].body.each_with_index do |e,idx|
    g.pop unless idx == 0
    e.bytecode(g)
  end

  g.goto done_lbl

  else_lbl.set!
  g.push :nil

  done_lbl.set!

  return true
end

.if_cond_else(g, name, args, if_true) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 83

def self.if_cond_else(g, name, args, if_true)
  return false unless args[0].kind_of? AST::Block
  return false unless args[1].kind_of? AST::Block

  done_lbl = g.new_label
  else_lbl = g.new_label

  if if_true
    g.gif else_lbl
  else
    g.git else_lbl
  end

  args[0].body.each_with_index do |e,idx|
    g.pop unless idx == 0
    e.bytecode(g)
  end

  g.goto done_lbl

  else_lbl.set!

  args[1].body.each_with_index do |e,idx|
    g.pop unless idx == 0
    e.bytecode(g)
  end

  done_lbl.set!

  return true
end

.rule_nameObject



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# File 'lib/prattle/ast/keyword_send.rb', line 6

def self.rule_name
  "keyword_send"
end

.send_method(g, name, args) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 115

def self.send_method(g, name, args)
  case name
  when "ifTrue:"
    return if if_cond g, name, args, true
  when "ifFalse:"
    return if if_cond g, name, args, false
  when "ifTrue:ifFalse:"
    return if if_cond_else g, name, args, true
  when "ifFalse:ifTrue:"
    return if if_cond_else g, name, args, false
  end

  if name[0] == ?~
    if args.last.kind_of? Block
      block = args.pop
    end

    args.each do |a|
      a.bytecode(g)
    end

    colon = name.index(":")
    new_name = name[1..colon-1]

    if block
      block.bytecode(g)
      g.send_with_block new_name.to_sym, args.size
    else
      g.send new_name.to_sym, args.size
    end

  else
    args.each do |a|
      a.bytecode(g)
    end

    g.send name.to_sym, args.size
  end
end

Instance Method Details

#bytecode(g) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 188

def bytecode(g)
  case @method_name
  when "whileTrue:"
    return if loop_cond g, true
  when "whileFalse:"
    return if loop_cond g, false
  end

  @receiver.bytecode(g)

  KeywordSend.send_method g, @method_name, @arguments
end

#loop_cond(g, if_true) ⇒ Object



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# File 'lib/prattle/ast/keyword_send.rb', line 155

def loop_cond(g, if_true)
  return false unless @receiver.kind_of? AST::Block
  return false unless @arguments[0].kind_of? AST::Block

  top_lbl  = g.new_label
  done_lbl = g.new_label

  top_lbl.set!

  @receiver.body.each_with_index do |e,idx|
    g.pop unless idx == 0
    e.bytecode(g)
  end

  if if_true
    g.gif done_lbl
  else
    g.git done_lbl
  end

  @arguments[0].body.each_with_index do |e,idx|
    e.bytecode(g)
    g.pop
  end

  g.goto top_lbl

  done_lbl.set!
  g.push :nil

  return true
end