/*
 * Multi-Process within a single threaded-process.
 * How to embed in a single threaded web server
 *
* 
* stix_exec
*    VM(shceduler) ---> Context1(obj1,method1)
*                  ---> Context2(obj2,method2)
*                  ---> Context3(obj3,method3)
* 
* all functions must be asynchronous
* blocking functions will block scheduler.
 */





class Stix::Stix                    # Namespace name is indicated by ::
{
}

class Stix::Array
{
	+ makeSymbol: aString
	{
		| s |

		s := Symbol new: aString.     # Symbol belongs to the Stix namespace.
		^s.
	}
}


A name space is stored in the namespace table of Stix.Namespaces.


Stix.Symbols - symbols are global. not affected by namespaces.
Stix.Sysdict -
	(#QSE => Namespace( Another Sysdict))
	(

class Stix::Namespace
{
}

class Stix::Class
{
}

Stix.Namespaces is a system dictionary

class QSE::Array 
{
}

class QSE::Tiara::Array
{
	
}


Stix.Namespaces -> 'QSE'
                   'QSE::Tiara'



------------------------------------------------------------

ARRAY CONSTANT TO ALLOW DYNAMIC VALUES.

#( ...... ) array literal
in original smalltalk, a block can't be placed inside the array literal
   arrayConstant  := '#' array
   array := "("  { number | string | symbol | array | characterConstant }* ")".
So #(1 2 [^20]) is illegal.

if a block is there, treat it as a valid stix expression and evaluate it.

#(1 2 [1 + 2] 5)
t = Array new: 4.
t at: 1 put: 1.
t at: 2 put: 2.
t at: 3 put: (1 + 2).
t at: 4 put: 5.

Evaluate the expressions in the array first
Create an array
Put the right element.

-----------------------------------------------
command line

libstix.a

stix stix.im Class1.st Class2.st Main.st Main
 --> load the image, compile Class1.st, compile Class2.st compile Main.st
 --> 


stix stix.im 
  --> load the image

-------------------------------------------------------------------------

#!/usr/bin/stix

###################################
## Main.st
###################################

#include 'Class1.st'
#include 'Class2.st'

#class(#byte) Association(Magnitude) 
{
	declare a, b, c.
	declare(#class_instance) x.
	declare(#class) MAX_SIZE.

	function(#class) initialize
	{
		MAX_SIZE := 20.

		true whileTrue: [ 
			Stdout print: 10.
		].
	}

	function(#class) new: anInteger
	{
		Stix error: 'invalid message'.
	}
}

#main
	| a |

	a := Class1 new.
	Stdout format: #( 1 2 [a toInteger] ) with: '%.5d %.6d\n'.
	^0.

-------------------------------------------------------------------------
The statements after the #main directives are compiled as a class method of Stix.
That is, 'Stix::main'. It becomes the entry point.

-------------------------------------------------------------------------

If no #main directive is found, there is no official entry point.
However, if you have the initialize class method, it's invoked when a class
is compiled, the statement in the class is executed before #main.
if the statement creates a certain loop, it can act as a entry point as well.

--------------------------------------------------------------------------

Top level directive
#main, #class, #include, 

#include is avaialble everywheren. It doesn't have  to be in the top level.
Do i need #import?


---------------------------------------------------------------------------

if there are multiple #main, do i need to concatenate all?
or disallow only 1 #main??

---------------------------------------------------------------------------

#namespace directive?

#namespace Stix::Compiler

naming convention for multiple ?? . conflicts with the statement terminator.
:: is ok a single : is used for various purpose but more than 1 is illegal in smalltalk.
so use :: as a namespace separator.


Relative naming and absoluate naming?
	Stix::Compiler <- is Stix the absolute top or a subname class under the current space?
	::Stix::Compiler <- i don't like this

----------------------------------------------------------------------------


























"
    Stix
       Class
       NilObject
       Object
          NilObject
          Collection
             IndexedCollection
                FixedSizedCollection
                   Array
                   ByteArray
                      String
                         Symbol
             Set
                Dictionary
                   SystemDictionary
                SymbolSet
          Magnitude
             Association
             Character
             Number
                Integer
                   SmallInteger
                   LargeInteger
"


class Stix
{


	+ alloc
	{
		<primitive: 1>
	}

	+ new
	{
		^self alloc init.
	}

	- init
	{
		^self.
	}

	- finalize
	{
	}

	+ findClass: aString
	{

		| a b c |
	}

	
}

class Class extends Stix
{
}

class NilObject extends Stix
{
}

class Object extends Stix
{
}



-----------------------------------------
class variable
and class instance variable
-----------------------------------------

A  CV  X Y
   CIV x y

B CV Z
  civ z

C civ q


A: getX
	return x (return instance variable 1)

B getX
     return A'X (return invance variable 3)

x is index 1.
y is index 2.
z is index 3.
X is index 3 of A.
Y is index 3 of A.
Z is index 2 of B.
q is index 4 of C.


A has x y X Y
B has x y z Z
C has x y z q

place class intance variables before class variables.

-------------------------------------------


class Magnitude extends Stix
{
}

%include 'Association.st'

%class Association(Magnitude)
{
%category(Association class)

%constant
	ABC := XXX
	BCD := KKK
	TTT := 20

%self(private)


%self(instance creation)

	| Key Value |                   "class variables"  <--- index
	| xxx yyy | "class instance variables"   <--- index
	
	key: aKey
	{
		^self key: aKey value: nil.
	}

	key: aKey value: aValue
	{
		| ass |
		ass := self new.
		ass key: aKey value: aValue.
		^ass.
	}

%instance(initialization)
	| key value |  "instance variables"

	key: aKey value: aValue
	{
		key := aKey.
		value := aValue.
	}

	key
	{
		^key
	}

	value
	{
		^value
	}

	value: value
	{
		self->value := aValue
	}

	= anAssociation
	{
		^self->key = anAssociation key.
	}

	hash
	{
		^self->key hash
	}
}



"Creates a new class Association inheriting nil"
%class Association(nil)
{
	%func more
	{
		^self
	}
}


"Extends an existing Association class"
%class Association
{
}


class Character extends Magnitude
{
}

class Number extends Magnitude
{
}

class Integer extends Number
{
}

class SmallInteger extends Integer
{
}

class LargeInteger extends Integer
{

}



Association
{
%class
	| x y z |

	value: xxx
	{
	}
}

Association: Magnitude
{
}

Association: <- for extending
{
}

Association: 
{
}

Association key: xxx
{
}

Association key: xxx
{
}




----------------------------------------------------------------
class ByteArray(FixedSizeCollection): #byte
{
	fun at: anIndex put: aValue
	{
		^self basicAt: anIndex put: aValue.
	}
}

class(#byte) ByteArray(FixedSizedCollection)
{
}

class(#byte) ByteArray(Stix)
{
}

class Association(Magnitude) -> new Association inheriting Magnitude
class Association() -> new Association inheriting Stix
class(#byte) Association() -> new Association class inheriting Stix, but it's byte indexed.
class(#word) Association() -> new Association class inheriting Stix, but it's word indexed.
class(#pointer) Association() -> new Association class inheriting Stix, but it's oop indexed. (it can have the variable part on top of the fixed part. response to the 'new: aSize' message)
class(#word) Association(Magnitude) -> new Association class inheriting Magnitude, but it's word indexed.

class Association -> revisit the Association class defined previsously. Revisiting can add new methods.

#include 'Magnitude.st'

#class(#byte) Association(Magnitude)
{
## class variables can be accessed by class methods and instance methods.
## methods of subclasses can also access them.
	declare(#class) a b c.

## class instance variable can be accessed inside the class method only.

	declare(#class_instance) d, e, f

## All instance variables are protected by default.
	declare key, value.


##
##	declare(#class) a, b, c.   ## class variables
##	declare(#class_instance) a, b, c. ## class instance variables
##	declare(#instance) a, b, c. ## isntance variables
##	declare a,b, c. ## instance variables

##   function(#class)      ## class method
##   function(#instance)   ## instance method
##   function              ## instance method

##   dcl(#class) a, b, c. ## short form
##   dcl(#classinst) a, b, c
##   fun(#class) 


## var and fun are not keywords. they can be a method name or a variable name.
## Casing is not used to differentiate variable kinds like global local temporary etc.

## other modifiers (EXPERIMENTAL. JUST THINKING).
## declare(#class,#public,#rw) x. x can be accessed by other classes in read-write mode.
## function(#private) xxx xxx is a private method
## function(#class,#private) xxx xxx is private class method.

	function(#class) initialize
	{
		## This is the initilizer for the class object.
		## executed when this class is added to the system.
		## initialize the class variables and class instance variables.
		SIZE := 20.
	}

	function(#class) key: aKey
	{
		^self key: aKey value: nil.
	}

	function(#class) key: aKey value: aValue
	{
		| ass |
		ass := self new.
		ass key: aKey value: aValue.
		^ass.
	}

	function key: aKey value: aValue
	{
		key := aKey.
		value := aValue.
	}

	function key
	{
		^key
	}

	function value
	{
		^value
	}

	function value: value
	{
		self->value := aValue
	}

	function = anAssociation
	{
		^self->key = anAssociation key.
	}

	function hash
	{
		^self->key hash
	}

	function value: aBlock
	{
		|a | 

		a := [ :t1 | t1 value ] with: 10.
		^a + 10.
	}
}


;  message cascading
. steatement terminator or flaoting point if in number and followed by a digit.
^ return
[ ] block
# symbol or array
() grouping
$ character constant
|  temporary variable or end of block arguments.

"" comment
'' string
: at the of the keyword  or before block argument name.

-------------------
avaialbel
' !  

--------------------------------------------------
#! for comment
## for comment
-----------------------------

@ binarySelector for coordianate number @ number.

----------------------------------------------------------------------------

Single line comment
## comment text
#! comment text (easy handling to skip hash bang)

Multi-line comments - double quoted as in smalltalk
" comment text 설명이라지요. "