Class: Practice::Implementation::Interpreter

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby/practice/implementation/interpreter.rb

Overview

Brainfuck interpreter written in Ruby.

Defined Under Namespace

Classes: Command

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source) ⇒ Interpreter

Initialize.



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# File 'lib/ruby/practice/implementation/interpreter.rb', line 80

def initialize(source)
  syms = Interpreter.symbols
  tokens = source.each_char.map { |c| c }.select { |c| syms.include?(c) }
  @commands = tokens.map { |c| Interpreter.command(c) }
  @bracemap = parse(@commands)
end

Class Method Details

.command(c) ⇒ Object 



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# File 'lib/ruby/practice/implementation/interpreter.rb', line 124

def command(c)
  @symbols[c]
end

.process(cxt, bracemap) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ruby/practice/implementation/interpreter.rb', line 12

def @lshift.process(cxt, _)
  cxt.cursor -= 1
  raise ArgumentError.new('Subscript out of range') if cxt.cursor < 0
end

.symbols ⇒ Object

Get brainfuck symbols



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# File 'lib/ruby/practice/implementation/interpreter.rb', line 120

def symbols
  @symbols.keys
end

Instance Method Details

#evaluate(cxt) ⇒ Object

To evaluate the source code.



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# File 'lib/ruby/practice/implementation/interpreter.rb', line 88

def evaluate(cxt)
  while cxt.counter < @commands.length
    command = @commands[cxt.counter]
    command.process(cxt, @bracemap)
    cxt.counter += 1
  end
end