Aspect examples

gistfile1.coffee

class MyClass
    simple: ->
        alert "hello!"
    another: ->
        alert "hi!"
    withParams: (a, b) ->
        alert a + " - " + b
    withReturnValue: (a) ->
        return 2 * a

...

aspect MyClass, ->
    @around 'simple', (jp) ->
        alert "!!"
        jp.proceed()
        
a = new MyClass
a.simple()

....

# multiple aspects are also ok! these aspects could be in separate files 
# not that the call order depends on execution order: latest advice is called first
aspect MyClass, ->
    @around 'simple', (jp) ->
        alert "!!"
        jp.proceed()
aspect MyClass, ->
    @around 'simple', (jp) ->
        jp.proceed()
        alert '??'

a = new MyClass
a.simple()

...

# we can add many advices in same aspect
aspect MyClass, ->
    @around 'simple', (jp) -> alert '!!'; jp.proceed()
    @around 'another', (jp) ->
        # we can also "override" whole implementation
        alert "overrided"

a = new MyClass
a.simple()
a.another()

...

# we can modify arguments
aspect MyClass, ->
    @around 'withParams', (jp) -> 
        for i in [0..1]
            jp.getArgs()[i] = "*#{jp.getArgs()[i]}*"
        jp.proceed()

a = new MyClass
a.withParams("foo", "bar")

...

# we can also modify return values
aspect MyClass, ->
    @around 'withReturnValue', (jp) -> 
        jp.proceed()
        jp.setReturnValue Math.abs(jp.getReturnValue())

a = new MyClass
alert a.withReturnValue(3)
alert a.withReturnValue(-3)