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n s 3, 4, and 6 we covered three well-known programming paradigms in F#: functional, imperative, and object-oriented programming. In this chapter, we cover techniques and constructs related to what is essentially a fourth programming paradigm, which we call language-oriented programming. The word language can have a number of meanings in this context. For example, take the simple language of arithmetic expressions and algebra that you learned in high-school mathematics, made up of named variables such as x and y and composite expressions such as x+y, xy, x, and x2. For the purposes of this chapter, this language can have a number of manifestations: One or more concrete representations, for example, using an ASCII text format or an XML representation of arithmetic expressions. One or more abstract representations, for example, as F# values representing the normalized form of an arithmetic expression tree. One or more computational representations, either by functions that compute the values of arithmetic expressions or via other engines that perform analysis, interpretation, compilation, execution, or transformation on language fragments. These can be implemented in F#, in another .NET language, or in external engines. In this and later chapters, we cover many of the tasks associated with language-oriented programming. The techniques covered in this book are as follows: Manipulating formats such as XML, which are often used for concrete representations of languages (s 9 and 11) Writing parsers and lexers for other text formats, also often used as concrete representations of languages ( 16) Using F# types for abstract representations of languages (s 9 and 11) Using three techniques related to computational representations of languages: active patterns, quotations, and workflows (s 9 and 13) Interfacing with existing language execution components (SQL via LINQ in 15)

Both methods do the same thing: call MarkDelete(). But Delete() is scoped as public and can only be called if the object is not a child object (a topic covered later in the discussion about parent and child object behaviors). Conversely, DeleteChild() can only be called if the object is a child. Since it is intended for use by BusinessListBase, it is scoped as internal.

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Language-oriented programming is not a single technique; sometimes you will be working with fully concrete representations (for example, reading bits on a magnetic disk) and sometimes with fully computational representations (for example, defining and using functions that compute the value of arithmetic expressions). Most often you will probably be working somewhere in between (for example, manipulating abstract syntax trees). These tasks require different techniques, and there are trade-offs between choosing to work with different kinds of representations. For example, if you are generating human-readable formulae, then you may need to store more concrete information, but if you re interested just in evaluating arithmetic expressions, then a purely computational encoding may be more effective. You ll see some of those trade-offs in this chapter.

UndoableBase implements the basic functionality to take snapshots of an object s data and then perform undo or accept operations using these snapshots. These methods were implemented as protected methods, so they re not available for use by code in the UI. The BusinessBase class will implement three standard methods for use by the UI code, as described in Table 3-5. Table 3-5. Object-Editing Methods in BusinessBase

<td>Seattle, <abbr title="Washington">WA</abbr></td> <td>Crocodile Cafe</td> </tr> <tr> <td>June 12th</td> <td>Sacramento, <abbr title="California">CA</abbr></td> <td>Torch Club</td> </tr> <tr> <td>June 17th</td> <td>Austin, <abbr title="Texas">TX</abbr></td> <td>Speakeasy</td> </tr> </tbody> </table> Put this <table> within the <article> element of live.html. You can add some table cell styling to layout.css as well: td { padding: .5em 3em; } Update color.css with declarations for table headers and rows: th { color: #edc; background-color: #455; } tr td { color: #223; background-color: #eb6; } If you load live.html in a web browser, you will see a perfectly normal, somewhat nondescript table.

BeginEdit() CancelEdit() ApplyEdit()

Note The term language-oriented programming was originally applied to F# by Robert Pickering in the

Initiates editing of the object. Triggers a call to CopyState(). Indicates that the user wants to undo her recent changes. Triggers a call to UndoChanges(). Indicates that the user wants to keep her recent changes. Triggers a call to AcceptChanges().

Apress book Foundations of F#, and it really captures a key facet of F# programming. Thanks, Robert!

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