Module: LiveAST::Loader

Defined in:
lib/live_ast/loader.rb

Class Method Summary collapse

Class Method Details

.find_file(file) ⇒ Object 



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# File 'lib/live_ast/loader.rb', line 42

def find_file(file)
  if file.index Linker::REVISION_TOKEN
    raise "refusing to load file with revision token: `#{file}'"
  end

  search_paths(file) or
    raise LoadError, "cannot load such file -- #{file}"
end

.header_footer(wrap) ⇒ Object 



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# File 'lib/live_ast/loader.rb', line 22

def header_footer(wrap)
  return "class << Object.new;", ";end", true if wrap

  locals = NATIVE_EVAL.call("local_variables", TOPLEVEL_BINDING)

  params = locals.empty? ? "" : ("|;" + locals.join(",") + "|")

  return "lambda do #{params}", ";end.call", locals.empty?
end

.load(file, wrap) ⇒ Object 



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# File 'lib/live_ast/loader.rb', line 6

def load(file, wrap)
  file = find_file(file)

  # guards to protect toplevel locals
  header, footer, warnings_ok = header_footer(wrap)

  parser_src = Reader.read(file)
  evaler_src = +"" << header << parser_src << footer

  run = lambda do
    Evaler.eval(parser_src, evaler_src, TOPLEVEL_BINDING, file, 1)
  end
  warnings_ok ? run.call : suppress_warnings(&run)
  true
end

.search_paths(file) ⇒ Object 



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# File 'lib/live_ast/loader.rb', line 51

def search_paths(file)
  return file if File.file? file

  $LOAD_PATH.each do |path|
    target = File.join(path, file)
    return target if File.file? target
  end
  nil
end

.suppress_warnings ⇒ Object 



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# File 'lib/live_ast/loader.rb', line 32

def suppress_warnings
  previous = $VERBOSE
  $VERBOSE = nil
  begin
    yield
  ensure
    $VERBOSE ||= previous
  end
end