ASP.NET Web PDF Document Viewer/Editor Control Library

> let lexbuf = Lexing.from_string "3.4 \n 34 xyx";; val lexbuf : Lexing.lexbuf > SimpleTokensLex.token lexbuf;; val it : SimpleTokensLex.token = FLOAT 3.4 > (lexbuf.StartPos.Line, lexbuf.StartPos.Column);; val it : int * int = (0,0) > (lexbuf.EndPos.Line, lexbuf.EndPos.Column);; val it : int * int = (0,3) > SimpleTokensLex.token lexbuf;; val it : SimpleTokensLex.token = INT 34 > (lexbuf.StartPos.Line, lexbuf.StartPos.Column);; val it : int * int = (1,1) Often you may need to attach position information to each lexer token. However, when using lexers in conjunction with fsyacc parser generators, the position information is automatically read after each token is processed and then stored in the parser s state. We return to this topic later in this chapter.

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-- open the file in write mode -- create one if -- file does not exist. l_file_handle := utl_file.fopen( 'MY_DIR', 'my_file.txt', 'W', 256 ); for i in 1 .. 10 loop utl_file.put_line( l_file_handle, 'my line number ' || i ); dbms_output.put_line( l_buffer ); end loop; utl_file.fclose( l_file_handle ); exception when others then raise; end; / Our newly created file, my_file.txt, in the directory C:\TEMP looks as follows:

The global.asax is the most common way to inherit from HttpApplication, and this file is given special treatment by the Framework. Namely, its events are automatically wired. HTTP modules are set up within a specific application via the web.config file. The advantage with HTTP modules is that any number can be set up to extend the pipeline at the server level or within a specific application. The ASP .NET Framework uses dozens of these to provide a lot of built-in functionality. Finally, request processing can be customized using HttpHandlers. Again, dozens of these are used within the shipping version of the Framework to process different types of requests. Doing custom request processing is as easy as creating a type that implements the IHttpHandler interface, and there are several options for configuring a handler within an application. In the next section, we ll shift the focus from the pipeline down to the Page handler. This complex handler processes all requests for ASPX files. We ll also take a look under the hood at how the type that inherits from System.Web.UI.Page is transformed into a stream of HTML.

So far you have seen examples with one lexing rule only. This is because the main lexer rule was sufficient for all tokens and you have not yet come across the need to lex input that cannot be described by a regular expression. To illustrate this point, for instance, say you want to lex comments enclosed by (* and *). Formally, you have an opening delimiter, followed by the body of the comment, and finally enclosed by the closing delimiter. The first attempt, shown here: "(*" _* "*)" fails because the middle pattern matches everything and you will never reach the closing *). So, the best compromise could be follows: "(*" [^ '*']* "*)" where you match the inside of the comment as long as you do not see a star symbol and then you try to match the closing *). This of course will fail on any comment that contains a star symbol inside. You can play with this regular expression a little more. The inside of the comment is either anything but a star or all those stars that are not followed by another star or right parenthesis: "(*" ([^ '*'] | ('*'+ ([^ '*' ')'])))* '*'+ ')'

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We will use the functions get_raw() and put_raw() described in this section for reading from and writing to a binary file.

This is about as close as you can get, and yet even this pattern has a problem: it cannot match nested comments; it will always stop at the first closing delimiter, ignoring all nested comment openers. You can handle this problem by using a multirule lexer. The following rules show the additions you can make to the simpleTokensLex.fsl lexer from Listing 16-3 in order to properly handle comments and strings: rule token = ... | "(*" | "\""