object.chuia

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definePrivateMethod:as:
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callWithArg:
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if:then:else:
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callWithArg:
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object.huia

# These are the basic methods defined on Object.
# There are five magically defined in the runtime:
#
#   - `get:` retrieves an instance variable.
#   - `set:to:` sets an instance variable to a value.
#   - `defineMethod:as:` defines a methods on the receiver.
#   - `definePrivateMethod:as` defines a a private method on the receiver.
#   - `defaultResponderFor:` finds the requested method and returns it.
#   - `sendMessage:withArgs:` calls `defaultResponderFor:` then executes the
#      closure in the receiver's scope (after a privacy check).
#   - `if:then:` executes the `then` if the `if` argument is truthy.
#
#   Note that you can override any of these methods in your subclass.

definePrivateMethod: 'if:then:else' as: |test,positive,negative|
  result  = nil
  wasTrue = false

  if: test then: |_result|
    result = _result
    positive.callWithArg: _result
    wasTrue = true

  if: wasTrue then:
    negative.callWithArg: _result

definePrivateMethod: 'unless:then:' as: |test,positive|
  if: test then:
    nil
  else: |result|
    positive.callWithArg: result

pry.txt

[3] pry(main)> Huia.eval File.read('core/object.huia')
0000:  push_cpath_top
0001:  find_const_fast            :Huia
0003:  find_const_fast            :Core
0005:  find_const_fast            :Closure
0007:  push_literal               "create:"
0009:  push_rubinius
0010:  create_block               #<Rubinius::CompiledCode Roger Rabbit file=>
0012:  send_stack_with_block      :lambda, 0
0015:  send_stack                 :__huia__send, 2
0018:  ret
=> #<Huia::Script:0x24538 @compiled_method=#<Rubinius::CompiledCode  file=>, @filename="(eval)", @scope=main>
[4] pry(main)> `rm core/object.chuia`
=> ""
[5] pry(main)> Huia.load 'core/object'
Rubinius::InvalidRBC: /Users/jnh/Dev/Huia/huia/core/object
from kernel/delta/code_loader.rb:227:in `load_compiled_file'