kddnewton

putspecialobject 3
putnil
defineclass :FooBar, 0
  definemethod :foo
    putobject "FooBar#foo"
    leave

  definemethod :bar
    putobject "class variable"
    setclassvariable :@@bar

kddnewton

# frozen_string_literal: true

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem "json_pure"
  gem "benchmark-ips"
end

kddnewton

#!/usr/bin/env ruby
# frozen_string_literal: true

VM_DEFINECLASS_TYPE_CLASS           = 0x00
VM_DEFINECLASS_TYPE_SINGLETON_CLASS = 0x01
VM_DEFINECLASS_TYPE_MODULE          = 0x02
VM_DEFINECLASS_FLAG_SCOPED          = 0x08
VM_DEFINECLASS_FLAG_HAS_SUPERCLASS  = 0x10

def log(line, event, message)

kddnewton

def c2e(string) = string.chars.map { |char| [char.ord + 128000].pack("U") }.join
def e2c(string) = string.unpack("U*").pack("c*")

c2e("Hello, world!")
# => "👈👥👬👬👯🐬🐠👷👯👲👬👤🐡"

e2c("👈👥👬👬👯🐬🐠👷👯👲👬👤🐡")
# => "Hello, world!"

e2c(c2e("Hello, world!"))

kddnewton

def count(iseq)
  iseq[12].select { _1 in [:ensure | :rescue, *] }.sum { count(_1[1]) } +
  iseq[13].sum do
    case _1
    in Integer | Symbol
      0
    in [*, ["YARVInstructionSequence/SimpleDataFormat", *] => child, *]
      1 + count(child)
    in Array
      1

kddnewton

# frozen_string_literal: true

module SyntaxTree
  # This class is used to create a mutation that transforms syntax trees based
  # on various linting rules.
  class Linter
    def mutation
      SyntaxTree.mutation do |mutator|
        # Lint/AssignmentInCondition
        mutator.mutate("IfNode[predicate: Assign | OpAssign] | UnlessNode[predicate: Assign | OpAssign] | WhileNode[predicate: Assign | OpAssign] | UntilNode[predicate: Assign | OpAssign]") do |node|

kddnewton

require "syntax_tree"

# Create a new visitor that is going to visit the parsed tree.
visitor = SyntaxTree::Visitor::MutationVisitor.new

# Define a mutation on the visitor that is going to search for the given pattern
# to find nodes that match it and then call the given block to mutate the node
# in place in the tree.
visitor.mutate("If[predicate: Assign | OpAssign]") do |node|
  # Get the existing If's predicate node.

kddnewton

# Imagine we need to switch on some kind of input and do something based on some
# attribute of that input. We can do this with a case statement, where we inline
# each of the implementations of the interface that we're defining into the case
# statement. That would look something like:

class Input
  attr_reader :type, :name

  def initialize(type, name)
    @type = type

kddnewton

# This module is a light implementation of pattern matching that allows us to
# match against hashes and arrays as we would with the new pattern matching
# syntax.
module Pattern
  class ArrayPattern
    attr_reader :values

    def initialize(values)
      @values = values
    end

kddnewton

#!/usr/bin/env ruby
# frozen_string_literal: true

require "bundler/inline"

gemfile do
  source "https://rubygems.org"
  gem "syntax_tree"
end