Class: Preval::Visitors::Loops

Inherits:
Preval::Visitor show all
Defined in:
lib/preval/visitors/loops.rb

Instance Method Summary collapse

Methods inherited from Preval::Visitor

enable!

Instance Method Details

#on_for(node) ⇒ Object 



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# File 'lib/preval/visitors/loops.rb', line 6

def on_for(node)
  ast = Parser.parse("    \#{node.source(1)}.each do |\#{node.source(0)}|\n      \#{node.source(2)}\n    end\n  CODE\n\n  node.update(:stmts_add, ast[0].body)\nend\n")

#on_until(node) ⇒ Object 



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# File 'lib/preval/visitors/loops.rb', line 46

def on_until(node)
  # auto replace `until false` with `loop do`
  if node[0].is?(:var_ref) &&
     # the predicate to the while is a variable reference
     node[0, 0].is?(:@kw) &&
     # the variable reference is a keyword
     node[0, 0].body == 'false'
     # the keyword is "false"

    ast = Parser.parse("      loop do\n        \#{node.source(1)}\n      end\n    CODE\n\n    node.update(:stmts_add, ast[0].body)\n  end\n\n  # ignore `until true`\n  if node[0].is?(:var_ref) &&\n     # the predicate to the until is a variable reference\n     node[0, 0].is?(:@kw) &&\n     # the variable reference is a keyword\n     node[0, 0].body == 'true'\n     # the kwyword is \"true\"\n\n    node.update(:void_stmt, [])\n  end\nend\n")

#on_while(node) ⇒ Object 



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# File 'lib/preval/visitors/loops.rb', line 16

def on_while(node)
  # auto replace `while true` with `loop do`
  if node[0].is?(:var_ref) &&
     # the predicate to the while is a variable reference
     node[0, 0].is?(:@kw) &&
     # the variable reference is a keyword
     node[0, 0].body == 'true'
     # the keyword is "true"

    ast = Parser.parse("      loop do\n        \#{node.source(1)}\n      end\n    CODE\n\n    node.update(:stmts_add, ast[0].body)\n  end\n\n  # ignore `while false`\n  if node[0].is?(:var_ref) &&\n     # the predicate to the while is a variable reference\n     node[0, 0].is?(:@kw) &&\n     # the variable reference is a keyword\n     node[0, 0].body == 'false'\n     # the kwyword is \"false\"\n\n    node.update(:void_stmt, [])\n  end\nend\n")