Definitions ::= Definition* Definition ::= Define Id Shape Width Eq Number Height Eq Number in Visual C#.NET

Creator Denso QR Bar Code in Visual C#.NET Definitions ::= Definition* Definition ::= Define Id Shape Width Eq Number Height Eq Number
Definitions ::= Definition* Definition ::= Define Id Shape Width Eq Number Height Eq Number
Quick Response Code Maker In C#
Using Barcode printer for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET framework applications.
1: Domain-Spe cific Development
Creating Bar Code In C#.NET
Using Barcode encoder for VS .NET Control to generate, create barcode image in .NET framework applications.
FillColor Eq Color OutlineColor Eq Color Decorator* End Id Shape ::= Rectangle | RoundedRectangle | Ellipse Eq ::= "=" Decorator ::= Decorator Id Position Eq Position End Id Position ::= Center| TopLeft | TopRight | BottomLeft | BottomRight
Draw QR-Code In VS .NET
Using Barcode creation for ASP.NET Control to generate, create QR-Code image in ASP.NET applications.
The de nitions for Id, Number, and Color are not included here; it s assumed that they are built into the grammar-de ning language We need an algorithm to convert this BNF into a parser for the language it describes We d either use an existing parser-generator such as Yacc, Bison, Antlr, or Happy, or an expert might write one by hand in a normal third-generation programming language such as C# or Java Notice that the BNF is itself a DSL We might bootstrap the BNF language by describing its grammar in itself, causing it to generate a parser for itself Perhaps the hand-written parser will be quite simple, and the generated parser would handle a more complicated version of BNF This pattern of using languages to describe languages, and bootstrapping languages using themselves, is very common when de ning domain-speci c languages Implementing a textual DSL by implementing its grammar like this can be a dif cult and error-prone task, requiring signi cant expertise in language design and the use of a parser-generator Implementing a parser-generator is de nitely an expert task, because a grammar might be ambiguous or inconsistent, or might require a long look-ahead to decide what to do Furthermore, there is more to implementing a language than just implementing a parser We d really like an editor for the language that gives the kinds of facilities we expect from a programming language editor in a modern development
Printing QR Code ISO/IEC18004 In VS .NET
Using Barcode drawer for .NET framework Control to generate, create QR Code image in .NET applications.
Textual DSLs
QR Code JIS X 0510 Encoder In Visual Basic .NET
Using Barcode creator for .NET framework Control to generate, create QR Code ISO/IEC18004 image in Visual Studio .NET applications.
environment, like text colorization, real-time syntax checking, and autocompletion If you include these facilities, the task of implementing a textual language can get very large Happily, there are alternative strategies for implementing a textual DSL that don t involve implementing a new grammar The rst strategy is to use the facilities of a host language to emulate the capabilities of a domain-speci c language For example, the following C# code has the effect of de ning the same shape as the previous example:
Drawing Bar Code In Visual C#.NET
Using Barcode maker for .NET framework Control to generate, create bar code image in Visual Studio .NET applications.
Shape AnnotationShape = new Shape(ShapeKindRectangle, 15, 03, ColorKhaki, ColorBrown); Decorator Comment = new Decorator(PositionCenter); AnnotationShapeAddDecorator(Comment);
Barcode Drawer In Visual C#.NET
Using Barcode creator for .NET Control to generate, create bar code image in .NET framework applications.
This kind of code is often called con guration code, because it uses previously de ned classes and structures to create a speci c con guration of objects and data for the problem that you want to solve In effect, the de nitions of these classes and structures are creating an embedded DSL, and the con guration code is using that DSL The capabilities of modern languages to de ne abstractions such as classes, structures, enumerations, and even con gurable syntax make them more amenable to this approach than earlier languages that lacked these facilities The second strategy is to use XML Extensible Markup Language There are many ways in which the de nition can be expressed using XML Here s a possible approach
Paint ANSI/AIM Code 39 In C#
Using Barcode generation for Visual Studio .NET Control to generate, create Code 3/9 image in Visual Studio .NET applications.
< xml version="10" encoding="utf-8" > <Shapes> <Shape name="AnnotationShape"> <Kind>Rectangle</Kind> <Width>15</Width> <FillColor>Khaki</FillColor> <OutlineColor>Brown</OutlineColor> <Decorator name="Comment"> <Position>Center</Position> </Decorator> </Shape> </Shapes>
Code 128 Code Set A Creation In C#
Using Barcode encoder for .NET framework Control to generate, create Code-128 image in .NET framework applications.
1: Domain-Spe cific Development
Encoding ECC200 In C#.NET
Using Barcode encoder for VS .NET Control to generate, create Data Matrix image in .NET applications.
The syntax is obviously limited to what can be done using XML elements and attributes Nevertheless, the tags make it obvious what each element is intended to represent, and the meaning of the document is quite clear One great advantage of using XML for this kind of purpose is the widespread availability of tools and libraries for processing XML documents If we want to use standard XML tools for processing shape de nitions, the experience will be much improved if we create a schema that allows us to de ne rules for how shape de nitions are represented in XML documents There are several technologies available for de ning such rules for XML documents, including XML Schema from the World Wide Web Consortium (de ned at wwww3org/XML/Schemahtml), RELAX NG from the OASIS consortium (de ned at wwwrelaxngorg) and Schematron, which has been accepted as a standard by the International Organization for Standardization (ISO) and is de ned at wwwschematroncom Schematron is supported in NET: A version called SchematronNET is downloadable from SourceForge, and it is possible to combine the facilities of XML Schema and Schematron We ll use here the XML Schema approach, which is also supported by the NET framework An XML Schema is an XML document written in a special form that de nes a grammar for other XML documents So, using an appropriate schema, we can specify exactly which XML documents are valid shape definition documents Modern XML editors, such as the one in Visual Studio 2005, can use the XML schema to drive the editing experience, providing the user with real-time checking of document validity, colorization of language elements, auto-completion of tags, and tips about the document s meaning when you hover above the elements Here is one of many possible XML schemas for validating shape de nition documents such as the one presented earlier Writing such schemas is something of an art; you ll certainly observe that it is signi cantly more complicated than the BNF that we de ned earlier, although it expresses roughly the same set of concepts
Bar Code Creator In Java
Using Barcode creator for Java Control to generate, create bar code image in Java applications.
< xml version="10" encoding="utf-8" > <xs:schema xmlns="http://schemasmicrosoftcom/dsltools/ch01" attributeFormDefault="unqualified" elementFormDefault="qualified"
Painting Data Matrix 2d Barcode In VB.NET
Using Barcode maker for Visual Studio .NET Control to generate, create Data Matrix 2d barcode image in Visual Studio .NET applications.
ECC200 Creator In Java
Using Barcode encoder for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
Printing Bar Code In VS .NET
Using Barcode maker for Visual Studio .NET Control to generate, create barcode image in .NET framework applications.
Making UPCA In Java
Using Barcode drawer for Java Control to generate, create UPC-A Supplement 5 image in Java applications.
Creating Code 39 Extended In Java
Using Barcode drawer for Java Control to generate, create Code 3 of 9 image in Java applications.