Class: Superscript::Runner

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

Instance Method Summary collapse

Constructor Details

#initialize(path = nil) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/superscript/runner.rb', line 3

def initialize path=nil
  @path = if path
    path
  else
    "<interactive>"
  end
end

Instance Method Details

#run!(ctx, contents: nil) ⇒ Object 



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# File 'lib/superscript/runner.rb', line 11

def run!(ctx, contents:nil)
  contents = File.read(@path) unless contents

  @armed = false
  trace = TracePoint.new do |tp|
    if ENV["SUPERSCRIPT_DEBUG"]
      p [@armed, tp.path, tp.lineno, tp.method_id, tp.event, tp.defined_class]
    end

    if tp.defined_class.name == "BasicObject" && tp.method_id == :instance_eval
      if tp.event == :script_compiled
        @armed = true
      elsif tp.event == :c_return
        @armed = false
      end
    end

    if tp.event == :return && tp.defined_class.ancestors.include?(Superscript::Ctx)
      @armed = true
    end

    next unless @armed

    case tp.event
    when :line
      puts "< " + contents.split("\n")[tp.lineno - 1]
    when :c_call
      next if ["String","Float", "Integer"].include? tp.defined_class.name
      case tp.method_id
      when :singleton_method_added
        puts "Error: Deffining methods is not allowed"
        trace.disable
        exit 1
      else
        puts "Error: Command not found '#{tp.method_id}'"
        trace.disable
        exit 1
      end
    when :call
      if tp.defined_class.ancestors.include? Superscript::Ctx
        @armed = false
      end
    end
  end

  value = begin
    trace.enable
    v = ctx.instance_eval contents, @path
    trace.disable
    v
  rescue Exception => ex
    case ex.class.to_s
    when "SystemExit"
      exit ex.status
    when "NameError"
      print "#{@path}:#{ex.backtrace_locations.first.lineno} "
      puts ex.message.split(" for ").first
    else
      p [:exception, ex]
    end
  ensure
    trace.disable
  end

  value
end