ASP.NET Web PDF Document Viewer/Editor Control Library

n this chapter, you ll take a closer look at lexing and parsing, topics introduced briefly in s 9 and 11 In particular we introduce the lexer and parser generators, fslex and fsyacc, that come with the F# distribution A typical scenario when these techniques and tools can come in handy is the following: You want to read user-readable input that has a well-defined syntax You have a type (often an abstract syntax tree [AST] type) to represent this input The typical task is to parse the user input into your internal representation by breaking down the input string into a sequence of tokens (a process called lexical analysis) and then constructing an instance of your internal representation based on a grammar (via syntactic analysis) Lexing and parsing do not have to be separated, and there are often convenient .

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Figure 1-1. .NET solutions While not any .NET application will make use of all of the choices, all of them will make use of some. This book has ASP .NET 2.0 in the title, but we re going to examine ASP .NET in a broader scope than that of its role in the presentation tier. ASP .NET is an application server. IIS listens for incoming HTTP requests and maps them to processes that do all manner of work, and are not limited to generating HTML. To consider ASP .NET as being synonymous with Web Forms is severely limiting. Web Forms (ASPX pages) are but a small part of the functionality that ships with the Framework, and a narrow means of extending the functionality. ASP .NET acts as a host for Web Services, for remoted components, and for Component Services, and when Windows Communication Foundation ships there will be a host of choices there as well. We ve dedicated chapters to each of these topics. Figure 1-1 does not attempt to capture the role of Windows Communication Foundation or SQL Server 2005. For details on how these technologies fit into the picture, see the chapters on these topics specifically ( 9 and the latter part of 11). Let s take a look at how a few different architectures might look in production. There are a lot of different services, a lot of different requirements, and lot of ways to put it all together. A few fictitious architectures are created here for discussion, based on solutions that have proven to be effective in production environments.

In this example, we use a chunk size for the size of our buffer, which we declare as a char array: char[] buffer = new char[ chunkSize ]; Finally, we create a stream using the getAsciiStream() method on the Clob interface and read data in pieces of the size of our buffer just created: reader = new BufferedReader ( new InputStreamReader( clob.getAsciiStream())); int length = -1; int numOfCharactersRead = 0; while (( length = reader.read( buffer, 0, chunkSize)) != -1 ) { //System.out.println( buffer ); numOfCharactersRead += length; } System.out.println("num of characters read: " + numOfCharactersRead ); } } finally { if( reader != null ) { reader.close(); } JDBCUtil.close( pstmt); JDBCUtil.close( rset); } } In the next section, we ll look at how to write to a CLOB.

NET methods for extracting information from text in particular formats, as we show in this chapter Nevertheless, it is often best to treat the two processes separately Our goal in this chapter is to give the background needed to use the built-in lexing and parsing facilities of NET and F# effectively and to understand the options for lexing and parsing other input formats For lexing, we cover simple line-based techniques to crack data formats using the NET libraries directly We then show how to use fslex to break text into simple tokens, strings with escape characters, and nested comments, and we show table-based token generation and stateful lexing (passing state as a parameter as opposed to using mutable state) For parsing, we cover the core parsing topics of languages, grammar formalisms, and various parser types.

Writing to a CLOB (Overwriting at the Beginning)

To use this utility, you simply feed the tool the name of the assembly containing classes you need to configure with the /c switch for configure. You can also use /fc if there s a possibility that the application already exists, and you just want to add your types to it. After registration with COM+, the .NET attributes applied to your types will determine the default configuration of the components. You (or an administrator) can always go in and use the MMC snap-in for Component Services to change and further refine them.