baroquebobcat

Mirah Scoping and control structures

If statements

If statements don't introduce a new scope, like ruby, but they are a little tricky.

For example, if b is false in the following, what would a be?

baroquebobcat

If you want to unquote the args from a block, be sure to not include the pipes.

#Correct

quote do
  `list`.each { `block.arguments` cool_thing; `[block.body]` }
end

#Wrong

baroquebobcat

Extension Methods

In the Mirah compiler, you can make Macros that work on std lib / predefined classes. You can't, however, do it in your own code easily at the moment. You can add macros that apply to your own types but not others. Here's some ideas for an API to change that.

Related

• mirah/mirah#234

Questions

baroquebobcat

# Sake Brewing Scheduler
require 'date'

def dfmt date
  case date
  when Date
    date.strftime "%a, %b %e"
  when Range
    [date.first,date.last].map{|d|dfmt(d)}.join(" - ")
  end

baroquebobcat

import java.util.concurrent.ArrayBlockingQueue
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.atomic.AtomicLong

queue_size = 10
queue = ArrayBlockingQueue.new queue_size, true
counts = {"A"=> AtomicLong.new, "B" => AtomicLong.new}

producerA = Thread.new do
  while true

baroquebobcat

mirah 0.1.2 release highlights

 - improvements to the new mirrors implementation (try it with -T)
 - improvements to the new backend implementation (try it with -N)
 - added better casting for methods that return primitives (754cc38f)
 - =~, include? macros added to String (Thanks altamic)
 - << operator added to StringBuilder
 - improved line number recording in new backend
 - fixed a few macro expansion related bugs
 - Added Apache 2 license to gem metadata

baroquebobcat

Mirah Lambda Proposal

Lambda types

• Stabby / Lambda
• Block
• Nested Methods

Stabby / Lambda

baroquebobcat

$ rake gem
rm -rf build/bootstrap
mkdir -p build/bootstrap
Compiling 10 source files to /Users/nick/hacking/mirah_hacking/mirah/build/bootstrap
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/IsolatedResourceLoader.java
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/MirahClassLoader.java
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/jvm/compiler/Cleaned.java
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/jvm/types/Flags.java
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/jvm/types/MemberAccess.java
/Users/nick/hacking/mirah_hacking/mirah/src/org/mirah/jvm/types/MemberKind.java

baroquebobcat

# add a curry method to symbol for evil/awesome symbol to proc powers.
class Symbol
  def curry(n=nil)
   ->(*args) {
     ->(obj) {obj.send self, *args}
   }.curry(n)
  end
  
  def call(*n)
    curry.(*n)

baroquebobcat