May 2014 - Pharo-dev - lists.pharo.org

[Pharo-project] RTF reader/writer
by StÃ©phane Ducasse April 8, 2015

April 8, 2015

Hi guys Do you know if there is a library somewhere in Smalltalk to deal with RTF writing/saving? Stef

7 10

Keyboard Event Weirdness
by Sean P. DeNigris March 2, 2015

March 2, 2015

I put the following halt in HandMorph>>#handleEvent: anEvent isKeyboard ifTrue: [Transcript show: anEvent printString, ' keyChar: ', anEvent keyCharacter asString, ' keyValue: ', anEvent keyValue asString; cr]. Then I typed 'hi' in a Workspace and hit Cmd+a. Look at the weird Transcript output... [keyDown ''] keyChar: keyValue: 4 [keystroke 'h'] keyChar: h keyValue: 104 [keyUp ''] keyChar: keyValue: 4 [keyDown ''] keyChar: keyValue: 34 [keystroke 'i'] keyChar: i keyValue: 105 [keyUp ''] keyChar: keyValue: 34 [keyDown '<Cmd->'] keyChar: keyValue: 0 [keystroke '<Cmd-a>'] keyChar: a keyValue: 97 [keyUp '<Cmd->'] keyChar: keyValue: 0 It seems the keyUp/Downs do not have the correct charCode and the keyValue is different than the keystroke for the same key. What's going on here? ----- Cheers, Sean -- View this message in context: http://forum.world.st/Keyboard-Event-Weirdness-tp4737056.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

2 6

Phexample: API Change Proposal (was Phexample: Image Destroying Bug)
by Sean P. DeNigris Sept. 25, 2014

Sept. 25, 2014

Reverting EyeInspector>>#updateList revealed the error when Phexample is used in latest Pharo 3.0... PhexMatcher uses #= as part of it's DSL e.g. "1 should = 1". Because it doesn't respond normally to #=, #hash is implemented to signal an error (self error: 'Don''t put a matcher into a dictionary. It does not behave ordinarily on ='). I guess the receiver inspector on the bottom left of the debugger keeps the items in a dictionary, so #hash gets called and everything blows up. The first thought that comes to my mind is that #= is "too cute" as a DSL. #= is too deep of a smalltalk concept to justify hijacking, AFAICT to avoid writing equals:. I removed #= and #hash from PhexMatcher, adding an #equals: with the former #= implementation, and everything seems to work. I don't have write access to http://smalltalkhub.com/mc/Phexample/Phexample/main/ and realize it's a big API change, so I committed the fix to http://smalltalkhub.com/mc/SeanDeNigris/SeansOutbox/main/ : Name: Phexample-SeanDeNigris.71 MAJOR API CHANGE: - change matcher #= to #equal: e.g. "1 should = 1" would now be written "1 should equal: 1" - update all code to use new API Motivation: the #= magic made it impossible to store matchers in dictionaries, and #hash was implemented to signal an error explaining as much. Unfortunately, #= and #hash are deeply ingrained Smalltalk concepts, and are assumed to work as expected. In Pharo 3.0, the debugger tried to put matchers in a dictionary, causing an infinite error loop whenever a matcher failed. ----- Cheers, Sean -- View this message in context: http://forum.world.st/Phexample-API-Change-Proposal-was-Phexample-Image-Des… Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

3 9

SqNumberParser and PGConnection in Pharo 3
by Esteban A. Maringolo Sept. 2, 2014

Sept. 2, 2014

So SqNumberParser is gone in Pharo 3. And the nextDateAndTimeFrom: in PGConnection refers to it... I replaced it by plain NumberParser and it seems to continue working. What is the approach here to have a "squeak compatible" PGConnection? Add an empty SqNumberClass as subclass NumberParser? Regards! Esteban A. Maringolo

4 17

Initial versions for OSWindow and Woden
by Ronie Salgado Aug. 20, 2014

Aug. 20, 2014

Hello There, I have been working in OSWindow, which is a cross platform API for dealing with native operating system windows. This API requires using a custom VM and the library SDL2. With this API, even the main Pharo window is handled almost completely in image side using NativeBoost. The only support required from the VM is a small periodical check in the heartbeat about the presence of events. This no more than 10 lines of code. This is currently working very well in my Linux machine, so I need to start testing this stuff. For Windows, soon I will be building the custom VM. My last built was very dirty and I want to do something more clean. For Mac OS X, I don't have one for testing. But Alex is going allow me to borrow one for some time. So be patience. As for Woden, it is a new 3D graphics engine that I started making. This one requires currently support of OSWindow and also shows some cool stuffs. As for prebuilt versions of the VM with OSWindow support along with preloaded images for both, OSWindow and Woden. And screenshots. Well, I am putting them here: http://ronie.cl/OSWindow/ Greetings, Ronie

9 15

Re: [Pharo-dev] Improving Pharo By Example
by kilon alios July 28, 2014

July 28, 2014

In section 1.9 page 18 there is this text "At other times you may have a good idea that a method exists, but will have no idea what it might be called. The method finder can still help! For example, suppose that you would like to find a method that turns a string into upper case, for example, it would translate 'eureka' into 'EUREKA'. The method finder will suggest a method that does what you want.8 An asterisk at the beginning of a line in the right pane of the method finder indicates that this method is the one that was actually used to obtain the requested result. So, the asterisk in front of String asUppercase lets us know that the method asUppercase defined on the class String was executed and returned the result we wanted. The methods that do not have an asterisk are just the other methods that have the same name as the ones that returned the expected result. So CharacterÂ»asUppercase was not executed on our example, because 'eureka' is not a Character object. You can also use the method finder for methods with arguments; for example, if you are looking for a method that will find the greatest common factor of two integers, you might try 25. 35. 5 as an example. You can also give the method finder multiple examples to narrow the search space; the help text in the bottom pane explains how. " I tried " 'eureka' . 'EUREKA '" and the other suggestion it does not seem to work , should I remove this section ? On Tue, May 20, 2014 at 12:17 AM, kilon alios <kilon.alios(a)gmail.com> wrote: > thanks Damien > > > On Tue, May 20, 2014 at 12:10 AM, Damien Cassou <damien.cassou(a)gmail.com>wrote: > >> A quick tour of >> quick >> >> In this chapter we will give you a high-level tour of to help you get >> comfortable with the environment. >> There will be plenty of opportunities to try things out, so it would >> be a good idea if you have a computer handy when you read this >> chapter. >> >> We will use this icon: to mark places in the text where you should >> try something out in . >> In particular, you will fire up , learn about the different ways of >> interacting with the system, and discover some of the basic tools. >> You will also learn how to define a new method, create an object and >> send it messages. >> >> >> Getting started >> >> is available as a free download from . >> There are three parts that you will need to download, consisting of >> four files (see download). >> >> >> >> >> >> >> >> >> The virtual machine (VM) is the only part of the system that is >> different for each operating system and processor. Pre-compiled >> virtual machines are available for all the major computing >> environments. In download we see the VM for the selected platform is >> called Pharo.exe. >> >> The sources file contains the source code for all of the parts of >> that don't change very frequently. In download it is called >> SqueakV39.sources. >> >> The current system image is a snapshot of a running system, frozen >> in time. It consists of two files: an .image file, which contains the >> state of all of the objects in the system (including classes and >> methods, since they are objects too), and a .changes file, which >> contains a log of all of the changes to the source code of the system. >> In download, these files are called pharo.image and pharo.changes. >> >> >> Download and install on your computer. >> We recommend that you use the image provided on the by Example web page. >> >> sbeImage >> >> Most of the introductory material in this book will work with any >> version, so if you already have one installed, you may as well >> continue to use it. >> However, if you notice differences between the appearance or behaviour >> of your system and what is described here, do not be surprised. >> >> >> As you work in , the image and changes files are modified, so you need >> to make sure that they are writable. >> Always keep these two files together. >> Never edit them directly with a text editor, as uses them to store the >> objects you work with and to log the changes you make to the source >> code. >> It is a good idea to keep a backup copy of the downloaded image and >> changes files so you can always start from a fresh image and reload >> your code. >> >> The sources file and the VM can be read-only---they can be shared >> between different users. >> All of these files can be placed in the same directory, but it is also >> possible to put the Virtual Machine and sources file in separate >> directory where everyone has access to them. >> Do whatever works best for your style of working and your operating >> system. >> >> >> >> >> >> >> >> >> >> >> >> >> Launching. To start , do whatever your operating system expects: drag >> the .image file onto the icon of the virtual machine, or double-click >> the .image file, or at the command line type the name of the virtual >> machine followed by the path to the .image file. (When you have >> multiple VMs installed on your machine the operating system may not >> automatically pick the right one; in this case it is safer to drag and >> drop the image onto the virtual machine, or to use the command line.) >> >> Once is running, you should see a single large window, possibly >> containing some open workspace windows (see startup), and it's not >> obvious how to proceed! >> You might notice a menu bar, but mainly makes use of context-dependent >> pop-up menus. >> >> >> >> Start . You can dismiss any open workspaces by ing on the red button >> in the top left corner of the workspace window. >> >> You can minimize windows (so that they move to the dock on the bottom >> of the screen) by ing on the orange button. Clicking on the green >> button will cause the window to take up the entire screen. >> >> >> First Interaction. >> >> A good place to get started is the world menu shown in threeButtons:click. >> >> Click with the mouse on the background of the main window to show the >> world menu, then choose Workspace to create a new workspace. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> morphic haloMorphic >> >> >> >> >> >> >> >> >> >> >> >> >> was originally designed for a computer with a three button mouse. If >> your mouse has fewer than three buttons, you will have to press extra >> keys while ing the mouse to simulate the extra buttons. A two-button >> mouse works quite well with , but if you have only a single-button >> mouse, you should seriously consider buying a two-button mouse with a >> clickable scroll wheel: it will make working with much more pleasant. >> >> avoids terms like ``left mouse click'' because different computers, >> mice, keyboards and personal configurations mean that different users >> will need to press different physical buttons to achieve the same >> effect. >> Originally introduced colours to stand for the different mouse buttons. >> >> >> >> Since many users will use various modifiers keys (control, ALT, meta ) >> to achieve the same effect, we will instead use the following terms: >> >> [:] this is the most often used mouse button, and is normally >> equivalent to ing a single-mouse button without any modifier key; on >> the image to bring up the ``World'' menu (threeButtons:click). >> [:] this is the next most used button; it is used to bring up a >> contextual menu, that is, a menu that offers different sets of actions >> depending on where the mouse is pointing; see threeButtons:actclick. >> If you do not have a multi-button mouse, then normally you will >> configure the control modifier key to with the mouse button. >> [:] Finally, you may on any object displayed in the image to activate >> the ``morphic Morphichalo'', an array of handles that are used to >> perform operations on the on-screen objects themselves, such as >> rotating them or resizing them; see threeButtons:metaclick. >> If you let the mouse linger over a handle, a help balloon will explain >> its function. >> In , how you depends on your operating system: >> either you must hold shift ctrl or shift option while clicking. >> >> >> >> >> Type Time now in the workspace. >> Now in the workspace. >> Select print it. >> >> >> >> >> >> >> >> >> >> >> >> >> >> We recommend that right-handed people configure their mouse to with >> the left button, with the right button, and with the clickable scroll >> wheel, if one is available. >> >> >> If you are using a Macintosh without a second mouse button, you can >> simulate one by holding down the key while ing the mouse. However, >> if you are going to be using at all often, we recommend investing in a >> mouse with at least two buttons. >> >> You can configure your mouse to work the way you want by using the >> preferences of your operating system and mouse driver. >> How can I get meta-click without a three-finger salute? Is this a secret? >> has some preferences for customising the mouse and the meta keys on >> your keyboard. >> In the preference browser (System Preferences Preference Browser), >> the keyboard category contains an option swapControlAndAltKeys that >> switches the and functions. >> There are also options to duplicate the various command keys. >> >> >> >> >> >> >> >> >> The World menu >> >> >> again on the background. >> You will see the World menu again. >> Most menus are not modal; you can leave them on the screen for as long >> as you wish by ing the push pin icon in the top-right corner. Do this. >> >> >> The world menu provides you a simple means to access many of the tools >> that offers. >> >> Have a closer look at the World and Tools menus. (threeButtons:click) >> >> You will see a list of several of the core tools in , including the >> browser and the workspace. >> We will encounter most of them in the coming chapters. >> >> >> Sending messages >> >> Open a workspace. Type in the following text: >> >> >> BouncingAtomsMorph new openInWorld >> >> >> Now . A menu should appear. Select do it (d). (See doit.) >> >> >> >> >> >> >> A window containing a large number of bouncing atoms should open in >> the top left of the image. >> >> You have just evaluated your first expression! >> You just sent the message new to the class, resulting in a new >> instance, followed by the message openInWorld to this instance. >> The class decided what to do with the new message, that is, it looked >> up its methods for handling new message and reacted appropriately. >> Similarly the instance looked up its method for responding to >> openInWorld and took appropriate action. >> >> If you talk to Smalltalkers for a while, you will quickly notice that >> they generally do not use expressions like ``call an operation'' or >> ``invoke a method'', but instead they will say ``send a message''. >> This reflects the idea that objects are responsible for their own actions. >> You never tell an object what to do---instead you politely ask it to >> do something by sending it a message. >> The object, not you, selects the appropriate method for responding to >> your message. >> >> >> Saving, quitting and restarting a session >> >> Now on the bouncing atoms window and drag it anywhere you like. You >> now have the demo ``in hand''. Put it down by ing anywhere. >> >> >> >> >> >> >> >> >> >> >> >> >> >> Select WorldSave as , enter the name ``myPharo'', and on the OK button. >> Now select WorldSave and quit. >> >> Now if you go to the location where the original image and changes >> files were, you will find two new files called ``myPharo.image'' and >> ``myPharo.changes'' that represent the working state of the image at >> the moment before you told to Save and quit. >> If you wish, you can move these two files anywhere that you like on >> your disk, but if you do so you may (depending on your operating >> system) need to also move, copy or link to the virtual machine and the >> sources file. >> >> Start up from the newly created ``myPharo.image'' file. >> >> Now you should find yourself in precisely the state you were when you >> quit . The is there again and the atoms continue to bounce from where >> they were when you quit. >> >> When you start for the first time, the virtual machine loads the image >> file that you provide. This file contains a snapshot of a large number >> of objects, including a vast amount of pre-existing code and a large >> number of programming tools (all of which are objects). As you work >> with , you will send messages to these objects, you will create new >> objects, and some of these objects will die and their memory will be >> reclaimed (garbage-collected). >> >> When you quit , you will normally save a snapshot that contains all of >> your objects. If you save normally, you will overwrite your old image >> file with the new snapshot. Alternatively, you may save the image >> under a new name, as we just did. >> >> In addition to the .image file, there is also a .changes file. >> This file contains a log of all the changes to the source code that >> you have made using the standard tools. >> Most of the time you do not need to worry about this file at all. >> As we shall see, however, the .changes file can be very useful for >> recovering from errors, or replaying lost changes. >> More about this later! >> >> The image that you have been working with is a descendant of the >> original image created in the late 1970s. >> Some of these objects have been around for decades! >> >> You might think that the image is the key mechanism for storing and >> managing software projects, but you would be wrong. >> As we shall see very soon, there are much better tools for managing >> code and sharing software developed by teams. >> Images are very useful, but you should learn to be very cavalier about >> creating and throwing away images, since tools like Monticello offer >> much better ways to manage versions and share code amongst developers. >> >> Using the mouse (and the appropriate modifier keys), on the . >> You will see a collection of colored circles that are collectively >> called the morphic Morphichalo. >> Each circle is called a handle. >> Click in the pink handle containing the cross; the should go away. >> >> >> Workspaces and Transcripts >> transcript >> >> Close all open windows. Open a transcript and a workspace. (The >> transcript can be opened from the WorldTools ... submenu.) >> >> Position and resize the transcript and workspace windows so that the >> workspace just overlaps the transcript. >> You can resize windows either by dragging one of the corners, or by >> ing the window to bring up the morphic halo, and dragging the yellow >> (bottom right) handle. >> >> At any time only one window is active; it is in front and has its >> border highlighted. >> >> >> The transcript is an object that is often used for logging system >> messages. >> It is a kind of ``system console''. >> >> >> >> >> Workspaces are useful for typing snippets of code that you would like >> to experiment with. >> You can also use workspaces simply for typing arbitrarily text that >> you would like to remember, such as to-do lists or instructions for >> anyone who will use your image. >> Workspaces are often used to hold documentation about a captured >> image, as is the case with the standard image that we downloaded >> earlier (see startup). >> >> Type the following text into the workspace: >> >> Transcript show: 'hello world'; cr. >> >> >> Try double-ing in the workspace at various points in the text you have >> just typed. >> Notice how an entire word, entire string, or the whole text is >> selected, depending on whether you within a word, at the end of the >> string, or at the end of the entire expression. >> >> Select the text you have typed and . >> Select do it (d). >> Notice how the text ``hello world'' appears in the transcript window >> (helloworld). >> Do it again. >> (The (d) in the menu item do it (d) tells you that the keyboard >> shortcut to do it is d. More on this in the next section!) >> >> >> >> >> >> >> >> Keyboard shortcuts >> >> If you want to evaluate an expression, you do not always have to . >> Instead, you can use keyboard shortcuts. These are the parenthesized >> expressions in the menu. Depending on your platform, you may have to >> press one of the modifier keys (control, alt, command, or meta). >> (We will indicate these generically as key.) >> >> Evaluate the expression in the workspace again, but using the keyboard >> shortcut: d. >> >> >> In addition to do it, you will have noticed print it, inspect it and >> explore it. Let's have a quick look at each of these. >> >> Type the expression 3 + 4 into the workspace. Now do it with the >> keyboard shortcut. >> >> Do not be surprised if you saw nothing happen! What you just did is >> send the message + with argument 4 to the number 3. Normally the >> result 7 will have been computed and returned to you, but since the >> workspace did not know what to do with this answer, it simply threw >> the answer away. If you want to see the result, you should print it >> instead. print it actually compiles the expression, executes it, sends >> the message printString to the result, and displays the resulting >> string. >> >> Select 3+4 and print it (p). >> This time we see the result we expect (printit). >> >> >> >> >> >> >> >> >> 3 >> @TEST >> 3 + 4 --> 7 >> >> >> We use the notation --> as a convention in this book to indicate that >> a particular expression yields a given result when you print it. >> >> Delete the highlighted text ``7'' (should have selected it for you, so >> you can just press the delete key). Select 3+4 again and this time >> inspect it (i). >> >> Now you should see a new window, called an inspector, with the heading >> SmallInteger: 7 (inspectit). >> The inspector is an extremely useful tool that will allow you to >> browse and interact with any object in the system. >> The title tells us that 7 is an instance of the class SmallInteger. >> The left panel allows us to browse the instance variables of an >> object, the values of which are shown in the right panel. >> The bottom panel can be used to write expressions to send messages to >> the object. >> >> >> >> >> >> >> Type self squared in the bottom panel of the inspector on 7 and print it. >> >> 2 >> Close the inspector. Type the expression Object in a workspace and >> this time explore it (I, uppercased i). >> >> >> >> This time you should see a window labelled Object containing the text >> root: Object. >> Click on the triangle to open it up (exploreit). >> >> >> >> >> >> >> The explorer is similar to the inspector, but it offers a tree view of >> a complex object. >> In this case the object we are looking at is the Object class. >> We can see directly all the information stored in this class, and we >> can easily navigate to all its parts. >> >> >> The Class Browser >> >> The class browser >> is one of the key tools used for programming. >> As we shall see, there are several interesting browsers available for >> , but this is the basic one you will find in any image. >> class browserbrowser >> >> Open a browser by selecting World Class browser. >> >> >> >> >> >> >> >> >> >> We can see a browser in classBrowser. >> The title bar indicates that we are browsing the class Object. >> >> >> When the browser first opens, all panes are empty but the leftmost one. >> This first pane lists all known packages, which contain groups of >> related classes. >> >> >> Click on the Kernel package. >> This causes the second pane to show a list of all of the classes in >> the selected package. >> >> Select the class Object. >> Now the remaining two panes will be filled with text. >> The third pane displays the protocols of the currently selected class. >> These are convenient groupings of related methods. >> If no protocol is selected you should see all methods in the fourth pane. >> >> Select the printing protocol. >> You may have to scroll down to find it. >> Now you will see in the fourth pane only methods related to printing. >> >> Select the ObjectprintString method. >> Now we see in the bottom pane the source code of the printString >> method, shared by all objects in the system (except those that >> override it). >> >> >> Finding classes >> >> There are several ways to find a class in . The first, as we have >> just seen above, is to know (or guess) what category it is in, and to >> navigate to it using the browser. >> >> browser!finding classesclass, finding >> >> >> A second way is to send the browse message to the class, asking it to >> open a browser on itself. Suppose we want to browse the class >> Boolean. >> >> Type Boolean browse into a workspace and do it. >> A browser will open on the Boolean class (browseBoolean). >> There is also a keyboard shortcut b (browse) that you can use in any >> tool where you find a class name; >> >> select the name and type b. >> >> Use the keyboard shortcut to browse the class Boolean. >> >> >> >> >> >> >> >> Notice that when the Boolean class is selected but no protocol or >> method is selected, instead of the source code of a method, we see a >> class definition (browseBoolean). >> This is nothing more than an ordinary message that is sent to the >> parent class, asking it to create a subclass. >> Here we see that the class Object is being asked to create a subclass >> named Boolean with no instance variables, class variables or ``pool >> dictionaries'', and to put the class Boolean in the Kernel-Objects >> category. >> >> If you on the ? at the bottom of the class pane, you can see the class >> classcomment in a dedicated pane (see classComment). >> >> >> >> >> >> >> >> Often, the fastest way to find a class is to search for it by name. >> For example, suppose that you are looking for some unknown class that >> represents dates and times. >> >> Put the mouse in the package pane of the browser and type f, or select >> find class (f) by ing. Type ``time'' in the dialog box and accept it. >> >> You will be presented with a list of classes whose names contain >> ``time'' (see findit). Choose one, say, Time, and the browser will >> show it, along with a class comment that suggests other classes that >> might be useful. If you want to browse one of the others, select its >> name (in any text pane), and type b. >> >> >> >> >> >> >> >> >> >> >> >> >> >> Note that if you type the complete (and correctly capitalized) name of >> a class in the find dialog, the browser will go directly to that class >> without showing you the list of options. >> >> >> Finding methods >> quick:methodFinder >> >> Sometimes you can guess the name of a method, or at least part of the >> name of a method, more easily than the name of a class. For example, >> if you are interested in the current time, you might expect that there >> would be a method called ``now'', or containing ``now'' as a >> substring. But where might it be? >> The method finder can help you. >> browser!finding methodsmethod, finding >> >> >> Select World Tools ... Method finder. >> Type ``now'' in the top left pane, and accept it (or just press the >> return key). >> The method finder will display a list of all the method names that >> contain the substring ``now''. >> To scroll to now itself, move the cursor to the list and type ``n''; >> this trick works in all scrolling windows. Select ``now'' and the >> right-hand pane shows you the classes that define a method with this >> name, as shown in MethodFinder. Selecting any one of them will open a >> browser on it. >> >> >> >> >> >> >> >> At other times you may have a good idea that a method exists, but will >> have no idea what it might be called. >> The method finder can still help! For example, suppose that you would >> like to find a method that turns a string into upper case, for >> example, it would translate 'eureka' into 'EUREKA'. >> >> Type 'eureka' . 'EUREKA' into the method finder and press >> the return key, as shown in >> methodFinder-example1. >> >> The method finder will suggest a method that does what you want. >> >> An asterisk at the beginning of a line in the right pane of the method >> finder indicates that this method is the one that was actually used to >> obtain the requested result. >> So, the asterisk in front of String asUppercase lets us know that the >> method StringasUppercase defined on the class String was executed and >> returned the result we wanted. The methods that do not have an >> asterisk are just the other methods that have the same name as the >> ones that returned the expected result. So CharacterasUppercase was >> not executed on our example, because 'eureka' is not a Character >> object. >> >> >> >> >> >> >> >> You can also use the method finder for methods with arguments; for >> example, if you are looking for a method that will find the greatest >> common factor of two integers, you might try 25. 35. 5 as an example. >> You can also give the method finder multiple examples to narrow the >> search space; the help text in the bottom pane explains how. >> >> >> Defining a new method >> >> The advent of Test Driven Development (TDD) has changed the way that >> we write code. >> The idea behind TDD is that we write a test that defines the desired >> behaviour of our code before we write the code itself. >> Only then do we write the code that satisfies the test. >> Behavior Driven DevelopmentTest Driven Development >> >> >> Suppose that our assignment is to write a method that ``says something >> loudly and with emphasis''. What exactly could that mean? What would >> be a good name for such a method? How can we make sure that >> programmers who may have to maintain our method in the future have an >> unambiguous description of what it should do? We can answer all of >> these questions by giving an example: >> >> >> When we send the message shout to the string ``Don't panic'' the >> result should be ``DON'T PANIC!''. >> >> >> >> To make this example into something that the system can use, we turn >> it into a test method: >> >> >> >> 3 >> [testShout]A test for a shout method >> testShout >> self assert: ('Don''t panic' shout = 'DON''T PANICBANG') >> >> >> How do we create a new method in ? First, we have to decide which >> class the method should belong to. >> In this case, the shout method that we are testing will go in class >> String, so the corresponding test will, by convention, go in a class >> called StringTest. >> >> >> >> >> >> >> >> Open a browser on the class StringTest, and select an appropriate >> protocol for our method, in this case tests - converting, as shown in >> newMethodTemplate. >> The highlighted text in the bottom pane is a template that reminds you >> what a method looks like. >> Delete this and enter the code from testShout. >> Once you have typed the text into the browser, notice that the bottom >> pane is outlined in red. This is a reminder that the pane contains >> unsaved changes. >> So select accept (s) by ing in the bottom pane, or just type s, to >> compile and save your method. >> >> >> accept itkeyboard shortcut, accept >> >> If this is the first time you have accepted any code in your image, >> you will likely be prompted to enter your name. Since many people have >> contributed code to the image, it is important to keep track of >> everyone who creates or modifies methods. Simply enter your first and >> last names, without any spaces, or separated by a dot. >> >> >> >> >> >> >> >> Because there is as yet no method called shout, the browser will ask >> you to confirm that this is the name that you really want---and it >> will suggest some other names that you might have intended >> (testShoutConfirm). >> This can be quite useful if you have merely made a typing mistake, but >> in this case, we really do mean shout, since that is the method we are >> about to create, so we have to confirm this by selecting the first >> option from the menu of choices, as shown in testShoutConfirm. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Run your newly created test: open the SUnit TestRunner from the World >> menu. >> >> The leftmost two panes are a bit like the top panes in the browser. >> The left pane contains a list of categories, but it's restricted to >> those categories that contain test classes. >> >> Select CollectionsTests-Text and the pane to the right will show all >> of the test classes in that category, which includes the class >> StringTest. The names of the classes are already selected, so Run >> Selected to run all these tests. >> >> >> >> >> >> >> >> You should see a message like that shown in testRunnerTestShout, which >> indicates that there was an error in running the tests. The list of >> tests that gave rise to errors is shown in the bottom right pane; as >> you can see, StringTest>>>#testShout is the culprit. >> (Note that StringTest>>>#testShout is the Smalltalk convention to >> identify the StringTesttestShout method of the StringTest class.) >> If you on that line of text, the erroneous test will run again, this >> time in such a way that you see the error happen: >> ``MessageNotUnderstood: ByteString>>>shout''. >> >>Behavior, >> >> Behavior>> >> >> The window that opens with the error message is the debugger (see >> predebugger). >> >> We will look at the debugger and how to use it in env. >> >> >> >> >> >> >> >> The error is, of course, exactly what we expected: running the test >> generates an error because we haven't yet written a method that tells >> strings how to shout. >> Nevertheless, it's good practice to make sure that the test fails >> because this confirms that we have set up the testing machinery >> correctly and that the new test is actually being run. >> Once you have seen the error, you can Abandon the running test, which >> will close the debugger window. >> Note that often with Smalltalk you can define the missing method using >> the Create button, edit the newly-created method in the debugger, and >> then Proceed with the test. >> >> Now let's define the method that will make the test succeed! >> >> Select class String in the browser, select the converting protocol, >> type the text in shout over the method creation template, and accept >> it. >> (Note: to get a ^, type ). >> [shout]The shout method >> shout >> ^ self asUppercase, 'BANG' >> >> >> The comma is the string concatenation operation, so the body of this >> method appends an exclamation mark to an upper-case version of >> whatever String object the shout message was sent to. >> The tells that the expression that follows is the answer to be >> returned from the method, in this case the new concatenated string. >> commaCollection, comma operator >> >> >> Does this method work? Let's run the tests and see. >> >> Click on Run Selected again in the test runner, and this time you >> should see a green bar and text indicating that all of the tests ran >> with no failures and no errors. >> When you get to a green bar, it's a good idea to save your work and >> take a break. >> So do that right now! >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Chapter summary >> This chapter has introduced you to the environment and shown you how >> to use some of the major tools, such as the browser, the method >> finder, and the test runner. You have also seen a little of syntax, >> even though you may not understand it all yet. >> >> >> A running system consists of a virtual machine, a sources file, and >> image and changes files. Only these last two change, as they record a >> snapshot of the running system. >> When you restore a image, you will find yourself in exactly the same >> state---with the same running objects---that you had when you last >> saved that image. >> is designed to work with a three-button mouse to , or . If you >> don't have a three-button mouse, you can use modifier keys to obtain >> the same effect. >> You on the background to bring up the World menu and launch various >> tools. >> A workspace is a tool for writing and evaluating snippets of code. >> You can also use it to store arbitrary text. >> You can use keyboard shortcuts on text in the workspace, or any >> other tool, to evaluate code. The most important of these are do it >> (d), print it (p), inspect it (i), explore it (I) and browse it (b). >> >> The browser is the main tool for browsing code, and for developing new >> code. >> The test runner is a tool for running unit tests. It also supports >> Test Driven Development. >> >> >> >> >> jurabib >> scg >> >> >> >> >> >> >> >> >> On Mon, May 19, 2014 at 10:11 PM, Damien Cassou <damien.cassou(a)gmail.com> >> wrote: >> > On Mon, May 19, 2014 at 10:07 PM, kilon alios <kilon.alios(a)gmail.com> >> wrote: >> >> hmm ok, is that normal ? >> > >> > >> > the parser is waiting for the closing pair and don't emit anything >> > before it finds it. I could do better but I would need to spend more >> > time on the parser than I have right now. >> > >> > >> >> I did not expect this kind of behaviour. I will have to be more >> careful from >> >> here on. Thanks. >> >> >> >> Is there a way to obtain plain text from the tex file ? Dont care about >> >> formated text etc, just something that will be easy to copy paste >> because I >> >> cant paste from pdf and pasting from tex files is a huge pain cause I >> have >> >> to remove all the text syntax. >> > >> > what about this? >> > >> http://stackoverflow.com/questions/829408/extract-text-from-tex-remove-late… >> > >> > >> > -- >> > Damien Cassou >> > http://damiencassou.seasidehosting.st >> > >> > "Success is the ability to go from one failure to another without >> > losing enthusiasm." >> > Winston Churchill >> >> >> >> -- >> Damien Cassou >> http://damiencassou.seasidehosting.st >> >> "Success is the ability to go from one failure to another without >> losing enthusiasm." >> Winston Churchill >> > >

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DBXTalk > OpenDBX > MySQL and OSX Lion : working on 2.0
by phil＠highoctane.be July 11, 2014

July 11, 2014

I've been struggling to get the whole thing to work in Pharo 2.0 So, here are some pointers: I am using Xcode 4.6.3 with command line tools installed. I used the MySQL 32-bit client: mysql-connector-c-6.1.0-osx10.7-x86.dmg I used opendbx stable-1.4 To compile OpenDBX itself in 32 bits mode and all, here is the script I used. [PhilMac:~/Documents/Smalltalk/2-MyWorkspaces/workspaceOpenDbx philippeback$] cat compileopendbxosx.sh PATH=/Applications/Xcode.app/Contents/Developer/usr/bin:${PATH} echo `which ld` CPPFLAGS="-m32 -I/usr/local/mysql-connector-c-6.1.0-osx10.7-x86/include" \ CXXFLAGS="-m32 -I/usr/local/mysql-connector-c-6.1.0-osx10.7-x86/include" \ CFLAGS="-m32 -I/usr/local/mysql-connector-c-6.1.0-osx10.7-x86/include" \ LDFLAGS="-m32 -L/usr/local/lib -L/usr/local/mysql-connector-c-6.1.0-osx10.7-x86/lib -lmysqlclient" \ ./configure --with-backends="mysql" --disable-utils LDFLAGS="-m32 -L/usr/local/mysql-connector-c-6.1.0-osx10.7-x86/lib" make make install Now, I had to copy the libraries of the mysql client into /usr/local/lib/ The client libraries were in /usr/local/mysql-connector-c-6.1.0-osx10.7-x86/lib (you can ln -s them if you do not want to copy). To test that things were okay, I created the sodbxtest user, database, and all in MySQL. Then let's make sure we can use that one: mysql -usodbxtest -psodbxtest sodbxtest And then went to stable-1.4/test and issued: ./odbxtest -b mysql -h localhost -p 3306 -d sodbxtest -u sodbxtest -w sodbxtest Which should work. You can open the MySQL Workbench Admin tab > server status tab and see the commands issued. I had to do a symlink in: : /usr/local/pharo/bin/pharo-vm/Pharo.app/Contents/MacOS/Plugins/ (where I have my pharo vm installed) so that: libopendbx.dylib was pointing to /usr/local/lib/libopendbx.dylib Then, start the image where you have loaded the OpenDBXDriver configuration and run the tests. You can get the configuration from the World menu > Configurations OpenDBXDriver (GuillermoPolito.20) I installed the configuration and then did: (ConfigurationOfOpenDBXDriver project version: #stable) load. All tests for the MySQL backend turned up green. Maybe someone can put the above things in the right sections on the DBXTalk site, I didn't got enough info for the OSX version. Next step is to try to get GLORP running, not sure I'll go that route. Phil

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Metacello-github + filetree-git async
by Yuriy Tymchuk July 11, 2014

July 11, 2014

Hi guys. My workflow is like this: I load a configuration on CI with github:// magic in metacello conf. Then on local machine I add a local gitfiletree repo to the project packages. The thing is that the last version if loaded, but gitfiletree repo is showing that second last is loaded. And yes, diffs with last one (not loaded by gitfiletree opinion) show no changes and diffs with second last (current one by gitfiletree opinion) show changes that were mede in last version. Any clue what can be the problem? Uko

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NewList without Icons
by Nicolai Hess July 4, 2014

July 4, 2014

Hi, anyone knows how to use NewList without icons. Background: I have a collection with 5000 entries, every entry is a list of 20 strings. Inspecting this collection works, but scrolling the left pane of the inspector window is awfully slow. This is unexpected, as the only changing visual parts are the collection indices. For exampel, inspect the following collection: (1 to:5000) collect:[:x | (1 to:20) collect:[:t| t asString] ]. Dragging the scrollbar (or only dragging the window) is slow. Ok, there are many entries, but now, change this method (return nil instead of accessing the cache) NewList>>#iconForItem:at: ^nil "^ iconCache at: anItem ifAbsentPut: [ (self model iconForItem: anItem at: anIndex) asMorph ]" scrolling is smooth. The problem is, accessing the iconCache calls #hash on anItem, which is an IndexedEyeElement and this calls hash on its index AND on the value (the string array). The funny thing is, eyeinspector does not provide any icons at all. Therefore, is there a way to create the NewList and tell it to NEVER ask for icons? regards Nicolai

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[ANN]: Little NeoJSON Helper
by Sean P. DeNigris July 2, 2014

July 2, 2014

"Assuming Neo-JSON-Core is loaded" Gofer it smalltalkhubUser: 'SeanDeNigris' project: 'SeansPlayground'; package: 'Neo-JSON-Utilities'; load. To aid in writing mappings, send "reader mapHelperFor: MyDomainClass", where MyDomainClass need not even exist. This will halt inside the mapping, and bring up an inspector on a NeoJSONMapHelper object. >From here, you can #generateInstVars to map the json keys to inst vars, translating underscores to camel case. Then you can inspect #mappingSnippet, which will give you the code to replace "reader mapHelperFor: MyDomainClass" with the new mappings to inst vars. For example: mapper for: DoDropletSize do: [ :m | m mapInstVars: #(name cpu slug memory id disk); mapInstVar: #costPerHour to: #cost_per_hour; mapInstVar: #costPerMonth to: #cost_per_month ]. It could be enhanced, especially with a UI to further customize the mappings (e.g. maybe you want to map the boolean "required" key to a more Smalltalkish "isRequired" inst var, but it makes the common cases a bit easier. HTH :) ----- Cheers, Sean -- View this message in context: http://forum.world.st/ANN-Little-NeoJSON-Helper-tp4756763.html Sent from the Pharo Smalltalk Developers mailing list archive at Nabble.com.

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