Eng:Scratch File Format (1.4)/Scripts

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From a #p1043186 post by nXIII:

all scripts are converted to tuples before they are saved; each stack is converted to: (where () indicates an array)

(position (block1 block2 block3 ...))
each block is converted to:
(selector arg1 arg2 arg3 ...)
if the argument is a number, string, boolean, or color it is just included as the (n+1)th member of the array. If it is a block, the block is converted to a tuple and included in the correct place.

For example, the script:

when I receive [message v]
set [var v] to ([sqrt v] of (100))
repeat until <(var)=[1]>
	wait ((3) - (2)) secs
	change [var v] by (-1)
end
say (join [hello ] [world])
if <<touching [Sprite1 v]?> or <key [space v] pressed?>>
	broadcast [message v]
	switch to costume [costume1 v]
end

Gets encoded something like this:

   (
       Point(20, 20.0), 
       [
           [<#EventHatMorph>, 'message'],
           [<#changeVariable>, 'var', <#setVar:to:>, [<#computeFunction:of:>, 'sqrt', 100]], 
           [<#doUntil>, [<#=>, [<#readVariable>, 'var'], '1'], 
               [
                   [<#wait:elapsed:from:>, [<#->, 3, 2]], 
                   [<#changeVariable>, 'var', <#changeVar:by:>, -1]
               ]
           ], 
           [<#say:>, [<#concatenate:with:>, 'hello ', 'world']], 
           [<#doIf>,
               [<#|>, [<#touching:>, <ScratchSpriteMorph(Sprite1)>], [<#keyPressed:>, 'space']], 
               [
                   [<#broadcast:>, 'message'], 
                   [<#lookLike:>, 'costume1']
               ]
           ]
       ]
   )

Where <#say:> represents the Squeak Symbol "say:", and [] is used interchangeably with () for tuples. (Whitespace added for clarity.)

See Also

• Blockmaking FAQs to find information on block types (blockspecs)
• A post by ScratchReallyROCKS explaining the anatomy of a Scratch block