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The simplest way to build strings is via concatenation using the + operator: > "Couldn't put Humpty" + " " + "together again";; val it : string = "Couldn't put Humpty together again"

download one of the Linux source code distributions and retrieve the file from there. Make sure you use the same version of the Linux source code that matches your Windows source code.

At the start of this chapter we mentioned that the rise of the Web and other forms of networks is a major reason for the increasing importance of concurrent and asynchronous programming. Listing 13-13 shows an implementation of a web crawler using asynchronous programming and mailbox-processing techniques. Listing 13-13. A Scalable, Controlled Asynchronous Web Crawler open open open open open open open open System.Collections.Generic System.Net System.IO System.Threading System.Text.RegularExpressions Microsoft.FSharp.Control Microsoft.FSharp.Control.Mailboxes Microsoft.FSharp.Control.CommonExtensions

You can also build strings using objects of the .NET type System.Text.StringBuilder. These objects are mutable buffers that you can use to accumulate and modify text, and they re more efficient than repeated uses of the + operator. Here s an example:

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You also need to add the command syntax to the parser YACC code (also in sql_yacc.yy). Locate the show: label and add the command as shown in Listing 8-20. Listing 8-20. Parser Syntax Source Code for the SHOW DISK_USAGE Command show: /* BEGIN CAB MODIFICATION */ /* Reason for Modification: */ /* This section captures (parses) the SHOW ALV statement */ SHOW DISK_USAGE_SYM { LEX *lex=Lex; lex->sql_command= SQLCOM_SHOW_DISK_USAGE;

let limit = 50 let linkPat = "href=\s*\"[^\"h]*(http://[^&\"]*)\"" let getLinks (txt:string) = [ for m in Regex.Matches(txt,linkPat) -> m.Groups.Item(1).Value ] let (<--) (mp: #IChannel<_>) x = mp.Post(x) // A type that helps limit the number of active web requests type RequestGate(n:int) = let semaphore = new Semaphore(initialCount=n,maximumCount=n) member x.AcquireAsync( timeout) = async { let! ok = semaphore.WaitOneAsync( millisecondsTimeout=timeout)

> let buf = new System.Text.StringBuilder();; val buf : System.Text.StringBuilder > buf.Append("Humpty Dumpty");; > buf.Append(" sat on the wall");; > buf.ToString();; val it : string = "Humpty Dumpty sat on the wall"

You re probably wondering what this code does It looks rather benign and yet it is important to get this part right In fact, this is the stage where most developers give up and fail to add new commands The set of code identified by the show: label is executed whenever the SHOW token is identified by the parser YACC code is almost always written this way3 The SHOW DISK_USAGE_SYM statement indicates the only valid syntax that has the SHOW and DISK_USAGE tokens appearing (in that order) If you look through the code, you ll find other similar syntactical arrangements The code block following the syntax statement gets a pointer to the lex structure and sets the command attribute to the new command token SQLCOM_SHOW_DISK_USAGE Notice how this code matches the SHOW and DISK_USAGE_SYM symbols to the SQLCOM_SHOW_DISK_USAGE command so that the SQL command switch in the sql_parse.

if ok then return { new System.IDisposable with member x.Dispose() = semaphore.Release() |> ignore } else return! failwith "couldn't acquire a semaphore" } // Gate the number of active web requests let webRequestGate = RequestGate(5) // Fetch the URL, and post the results to the urlCollector. let collectLinks (url:string) = async { // An Async web request with a global gate let! html = async { // Acquire an entry in the webRequestGate. Release // it when 'holder' goes out of scope use! holder = webRequestGate.AcquireAsync() let req = WebRequest.Create(url,Timeout=5) // Wait for the WebResponse use! response = req.GetResponseAsync() // Get the response stream use reader = new StreamReader(response.GetResponseStream()) // Read the response stream return! reader.ReadToEndAsync() // Compute the links, synchronously let links = getLinks html // Report, synchronously do printfn "finished reading %s, got %d links" url (List.length links) // We're done return links } /// 'urlCollector' is a single agent that receives URLs as messages. It creates new /// asynchronous tasks that post messages back to this object. let urlCollector = MailboxProcessor.Start(fun self -> // This is the main state of the urlCollector let rec waitForUrl (visited : Set<string>) =

Note For compatibility with OCaml, the ^ operator can also be used for string concatenation, although it s

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