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When trying to edit the current item, it is important to ensure that the currentItem is a valid pointer, which is why the editItem slot in Listing 2-6 starts by checking it If the returned pointer is a null pointer, the slot returns without doing anything If a valid pointer is encountered, the text of the current list widget item is split into a name and a number using the split method They are used to set up an editing dialog When setting the name and the number, the parts of the split text are trimmed, which means removing all additional white space from the ends of the string (white space consists of all characters that take up space without showing) Examples of white space are spaces, tabs, line-feeds, newlines, and so on.

n this chapter, you will first take a look at what I mean by language-oriented programming, a term that has been used by many people to mean different things. I ll also briefly discuss its advantages and disadvantages. You ll then look at several different approaches to languageoriented programming in F#. These techniques include using F# literals to create little languages, using F# quotations, and creating a parser using fslex.exe and fsyacc.exe, which are themselves little languages.

net on a medium-sized server with a few hundred thousand registered users, that the software would be adequate in performance and adequate in features It wouldn t be too expensive to support administratively because the user interface wasn t confusing people By contrast, companies like Microsoft were still developing software for the Web as if the Web didn t exist..

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Livingston: What does that mean Greenspun: Let s say you have a word processor. You send a marketing person

As soon as the editing dialog has been set up, the code looks very much like the addItem slot, just that the current item s text is changed instead of adding a new item to the list widget Listing 2-6 Editing an item of the list void ListDialog::editItem() { if( !uilist->currentItem() ) return; QStringList parts = uilist->currentItem()->text()split( "--" ); EditDialog dlg( this ); dlgsetName( parts[0]trimmed() ); dlgsetNumber( parts[1]trimmed() ); if( dlgexec() == Qt::Accepted ) uilist->currentItem()->setText( dlgname() + " -- " + dlgnumber() ); } You have used the editing dialog twice now, so it is time to have a look at it In Listing 2-7, you can see the class declaration The EditDialog class inherits QDialog and has a private variable called ui containing the generated code for the user interface This is very much like the ListDialog class.

out to interview people and find out what features they need. Then they take that back to the product manager. The product manager writes up some specs: here are the features we re going to have in the next release. Then they send that to the programmers, who are in a vacuum, who build this thing according to the product manager s specs. When they re done, it goes to QA, but it s not a real running system they re not really trying to write documents; they re just QA people. Then eventually they burn a disk with the latest release of Microsoft Word, and they mail it out to all the world s lawyers, writers, students, and whoever else uses Microsoft Word. That works pretty well for word processors because it s a product that was developed in the 60s by IBM, and people are pretty sure of what the minimum features should be in a word processor. It also works pretty well because people don t demand frequent upgrades. There aren t new requirements and new ideas coming out in word processors, so if you have a release every three years, that s just fine. It doesn t hurt that Microsoft has a monopoly and there s no competition, so if it takes them 4 years instead of 3, it doesn t make any difference.

Although people use the term language-oriented programming to describe many different programming techniques, the techniques they refer to generally share a common theme. It s quite common for programmers to have to implement a predefined language; often this is because of a need to extract structured data from information stored or received as string or XML data that conforms to this predefined language. The techniques introduced in this chapter will help you do this more reliably. Related to this is the idea of little languages, or domain-specific languages (DSLs); you can create a DSL when the best way to solve a problem is to create a specialist language to describe the problem and then use this language to solve the problem. Functional programming has always had a strong relationship with languageoriented programming, because functional programming languages generally have features that are well suited to creating parsers and compilers.

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