Class: Lrb

Inherits:
Object
  • Object
show all
Defined in:
lib/lrb.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Lrb

Returns a new instance of Lrb.



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# File 'lib/lrb.rb', line 10

def initialize
  @debug = false
  @indent = 0
  @stack = Array.new
  @parser = Bracer.new
  @parser.ruby_keyword_literals = true
  readline_autocompletion
end

Instance Attribute Details

#debug ⇒ Object

Returns the value of attribute debug.



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# File 'lib/lrb.rb', line 8

def debug
  @debug
end

#parser ⇒ Object

Returns the value of attribute parser.



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# File 'lib/lrb.rb', line 8

def parser
  @parser
end

Instance Method Details

#eval_file(path) ⇒ Object 



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# File 'lib/lrb.rb', line 40

def eval_file path
  source = File.read path
  eval_source source, mode = :compile
end

#eval_list(list) ⇒ Object 



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# File 'lib/lrb.rb', line 70

def eval_list list
  eval list_to_ruby(list)
end

#eval_source(source, mode = :repl) ⇒ Object 



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# File 'lib/lrb.rb', line 45

def eval_source source, mode = :repl
  begin
    e = to_ruby source
    evaluated = eval e
  rescue Exception => ex
    if @debug
      puts ex.backtrace.join("\n").red
      binding.pry 
    end
    puts ex.message.red
  end
  if @debug
    if mode == :compile
      puts "[LRB]:".light_yellow
      puts source.light_yellow
    end  
    puts e.light_green
    if mode == :compile
      puts "\n[evaluated]:".light_yellow
      puts "#{evaluated}".blue
    end
  end
  evaluated
end

#list_to_ruby(ast) ⇒ Object 



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# File 'lib/lrb.rb', line 74

def list_to_ruby ast
  ast = ast.map do |sexp|
    result = transform sexp
    puts result if @debug
    result
  end
  ast.join "\n\n"
end

#parse(source) ⇒ Object 



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# File 'lib/lrb.rb', line 19

def parse source
  @parser.parse_string source 
end

#repl ⇒ Object 



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# File 'lib/lrb.rb', line 23

def repl
  begin
    while line = readline_with_hist_management
      @stack << line
      if balanced?
        e = eval_source @stack.join " "
        puts e.to_s.blue
        @stack.clear
        @indent = 0
      end
    end
  rescue Interrupt => e
    puts "\nGoodbye !".light_yellow
    exit
  end
end

#to_ruby(source) ⇒ Object 



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# File 'lib/lrb.rb', line 83

def to_ruby source
  ast = parse source 
  puts "parsed: #{ast}".green if @debug
  list_to_ruby ast
end

#transform(sexp) ⇒ Object 



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# File 'lib/lrb.rb', line 89

def transform sexp
  puts line if @debug
  if sexp.class == Array
    fun = sexp.first
    args = wrap_string sexp.drop(1)
    result = ""
    if @debug
      puts "function: #{fun}".yellow
      puts "args: #{args}".yellow
      puts line 
    end
    
    if KEYWORD.include? fun
      result = self.instance_exec *args, &KEYWORD[fun]
    elsif class_method? fun
      puts "[ERROR] dot operator only take 1 arg.".red if args.length > 1
      result = class_method_append fun, args.first
    else
      # function call
      result = compose_function fun, args
    end

    if @debug
      puts result.light_green
      puts line
    end
    indent + result
  else
    puts "#{sexp}".yellow if @debug
    sexp
  end
end