From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=unavailable autolearn_force=no version=3.4.4 X-Google-Thread: 103376,a0833bbed8752e1f X-Google-Attributes: gid103376,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news2.google.com!proxad.net!freenix!enst.fr!melchior!cuivre.fr.eu.org!melchior.frmug.org!not-for-mail From: Stephen Leake Newsgroups: comp.lang.ada Subject: Re: variable lenght strings Date: 21 Oct 2004 19:05:44 -0400 Organization: Cuivre, Argent, Or Message-ID: References: NNTP-Posting-Host: lovelace.ada-france.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: melchior.cuivre.fr.eu.org 1098399994 57537 212.85.156.195 (21 Oct 2004 23:06:34 GMT) X-Complaints-To: usenet@melchior.cuivre.fr.eu.org NNTP-Posting-Date: Thu, 21 Oct 2004 23:06:34 +0000 (UTC) To: comp.lang.ada@ada-france.org Return-Path: In-Reply-To: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 X-OriginalArrivalTime: 21 Oct 2004 23:05:50.0371 (UTC) FILETIME=[81E03730:01C4B7C2] X-Virus-Scanned: by amavisd-new-20030616-p10 (Debian) at ada-france.org X-BeenThere: comp.lang.ada@ada-france.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Gateway to the comp.lang.ada Usenet newsgroup" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Xref: g2news1.google.com comp.lang.ada:5604 Date: 2004-10-21T19:05:44-04:00 fmdf@tiscali.it (fabio de francesco) writes: > 1) Is it possible to use Get_Line with Unbounded and/or Bounded > Strings? If you are using GNAT, you can use Ada.Strings.Unbounded.Text_IO. > 2) If not, how should user input be managed when lines length isn't > known a priori? Ada.Text_IO.Get_Line takes a String argument; if it isn't filled, you can call Ada.Strings.Unbounded on it. The tricky part is what to do if your initial guess at a max length is too short. You can write a loop; keep appending chunks of input until Get_Line returns Last < Item'last. > > > Ok, please let me know if the following is the correct usage: "Correct usage" is whatever works for your application! > > > with Ada.Text_IO, Ada.Strings, Ada.Strings.Fixed, > Ada.Strings.Maps, Ada.Strings.Maps.Constants; > use Ada.Text_IO, Ada.Strings, Ada.Strings.Fixed, > Ada.Strings.Maps, Ada.Strings.Maps.Constants; > > procedure Tokenize is > > S : constant String := ".symbol HP = High_Pressure "; -- Line A > F : Positive := S'First; > L : Natural := S'Last; > W : String( 1..30 ); > > begin > loop > Find_Token(S(F..L), Alphanumeric_Set or To_Set("_."), Inside, F, > L); It would be best to declare a variable to hold Alphanumeric_Set or To_Set("_."). > if L /= 0 then This could be 'exit when L = 0', but it's really a style issue. > Put_Line( Positive'Image( F ) & ( L - F ) * ' ' & > Natural'Image( L ) ); > Move( S( F..L ), W ); Named association is better here; I always forget which is the target and which the source. > Put_Line( ' ' & W ); > F := L + 1; > L := S'Last; > else > exit; > end if; > end loop; > end Tokenize; > > > Is it correct to check the "L" value as a condition to exit the > loop? Yes. -- -- Stephe