The Squeak Environment

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Stéphane DucasseStephane.Ducasse@univ-savoie.frhttp://www.listic.univ-savoie.fr/~ducasse/

The Squeak Environment

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License: CC-Attribution-ShareAlike 2.0http://creativecommons.org/licenses/by-sa/2.0/

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Smalltalk Run-Time Architecture• Virtual Machine + Image + Changes and Sources

• Image = bytecodes• Sources and changes = code (text)

A byte-code interpreter:the virtual machine interpretes the imageIMAGE2.IMIMAGE2.CHAStandard SOURCESShared by everybody

IMAGE1.IMIMAGE1.CHAAll the objects of the systemat a moment in time

One per user+

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Runtime Architecture• The byte-code is in fact translated into native

code by a just-in-time compiler.

• The source and the changes are not necessary for interpreting the byte-code, this is just for the development. Normally they are removed for deployment.

• An application can be delivered as some byte-code files that will be executed with a VM. The development image is stripped to remove the unnecessary development components.

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Mouse Semantics

SelectOperateWindowRed BlueYellow

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World Menu and Open Menu

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Browsing a class

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Browsing methods

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Inspector• To look inside objects• Violates encapsulation!!!• Monster new inspect

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Direct Manipulation• Bring the halo• Experiment

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Debugger?

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Debugger !!!

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FileList

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Message Names Finder

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Methods in ChangeSets + Versions

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Preferences

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SUnit

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Transcript is Sloooooooooooow

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Squeak Map Package Loader

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Monticello

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Monticello Change Browser

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Repository

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SqueakSource

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Changes Menu…Recently logged files• Everything you do is recorded

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ChangeSorter: to sort your changes

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Cool Packages to LoadShoutRefactoring BrowsereCompletion

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Change your MindEverything you do is recorded !!So try and learn how to recover your code

You are smart so Experiment, Learn for you, browse, educate your taste (not all Squeak code is good)Be aggressive, ***all*** the code is there