Class: Rewrite::VariableRewriter

Inherits:
SexpProcessor
  • Object
show all
Defined in:
lib/rewrite/variables.rb

Overview

–

TODO: Implement splat variables somehow

def test_splat_variables

assert_equal(
  lambda { |*a| a[0].call }.to_sexp.to_a,
  Rewrite::RewriteVariablesAsThunkCalls.new(:a).process(
    lambda { |*a| a[0] }.to_sexp
  ).to_a
)

end

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(symbol, replacement_sexp) ⇒ VariableRewriter

Returns a new instance of VariableRewriter.



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# File 'lib/rewrite/variables.rb', line 29

def initialize symbol, replacement_sexp
  @symbol, @replacement_sexp = symbol, replacement_sexp
  super()
end

Instance Attribute Details

#replacement_sexp ⇒ Object (readonly)

Returns the value of attribute replacement_sexp.



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# File 'lib/rewrite/variables.rb', line 27

def replacement_sexp
  @replacement_sexp
end

Instance Method Details

#process_dvar(exp) ⇒ Object 



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# File 'lib/rewrite/variables.rb', line 40

def process_dvar(exp)
  exp.shift
  variable = exp.shift
  if @symbol == variable
    replacement_sexp # not a deep copy. problem? replace with a block call??
  else
    s(:dvar, variable)
  end
end

#process_iter(exp) ⇒ Object

don’t handle subtrees where we redefine the variable, including lambda and proc



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# File 'lib/rewrite/variables.rb', line 50

def process_iter(exp) # don't handle subtrees where we redefine the variable, including lambda and proc
  original = exp.to_a.dup
  exp.shift
  callee_expr = exp.shift # we process in our context
  params_exp = exp.shift
  block_body = exp.shift
  params = if params_exp.nil?
    []
  elsif params_exp.first == :dasgn || params_exp.first == :dasgn_curr
    [ params_exp[1] ]
  elsif params_exp.first == :masgn
    raise "Can't handle  #{original.inspect}" unless params_exp[1].first == :array
    params_exp[1][1..-1].map { |assignment| assignment[1] }
  else
    raise "Can't handle #{original.inspect}"
  end
  if params.include? @symbol
    s(:iter, subprocess(callee_expr), params_exp, block_body) # we're DONE
  else
    s(:iter, subprocess(callee_expr), params_exp, subprocess(block_body)) # we're still in play
  end
end

#subprocess(something) ⇒ Object

missing: rewriting assignment. Hmmm.



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# File 'lib/rewrite/variables.rb', line 36

def subprocess (something)
  process(something) if something
end