Class: Trxl::RequireDirective

Inherits:
Treetop::Runtime::SyntaxNode
  • Object
show all
Defined in:
lib/trxl/trxl.rb

Instance Method Summary collapse

Instance Method Details

#eval(env = Environment.new) ⇒ Object 



274
275
276
277
278
279
280
281
 
# File 'lib/trxl/trxl.rb', line 274

def eval(env = Environment.new)
  library = ((l = load_library(env))[-1..-1]) == ';' ? "#{l} ENV" : "#{l}; ENV"
  unless env.library_included?(identifier(env))
    env.merge!(Calculator.new.eval(library, env).local)
    env.add_library(identifier(env))
  end
  env
end

#identifier(env = Environment.new) ⇒ Object 



283
284
285
 
# File 'lib/trxl/trxl.rb', line 283

def identifier(env = Environment.new)
  @identifier ||= string_literal.eval(env)
end

#load_library(env = Environment.new) ⇒ Object

override this in subclasses



288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
 
# File 'lib/trxl/trxl.rb', line 288

def load_library(env = Environment.new)
  path = identifier(env).split('/')
  if path[0] == ('stdlib')
    if optimize_stdlib_access?
      if path.size == 2
        const = path[1].upcase
        if Trxl::StdLib.constants.include?(const)
          Calculator.stdlib(const)
        else
          raise MissingLibraryException, "Failed to load '#{identifier}'"
        end
      else
        Calculator.stdlib
      end
    else
      raise NotImplementedException, "Only optimized access is supported"
    end
  else
    raise NotImplementedException, "Only require 'stdlib' is supported"
  end
end

#optimize_stdlib_access? ⇒ Boolean

Returns:

  • (Boolean) 


310
311
312
 
# File 'lib/trxl/trxl.rb', line 310

def optimize_stdlib_access?
  true
end