Search DaniWeb - lookahead

Java Client/Server 18 Years Ago by chip1123 …pair n = in.read(); } possibleLineFeedPending = (n == '\r'); lookAhead = n; if (lookAhead == -1) { EOF = true; return '\0'; } } … { buffer[offset] = (char)lookAhead; lookAhead = -1; return 1; } else { buffer[offset] = (char)lookAhead; lookAhead = -1; int ct = … datepicker problem 14 Years Ago by begueradj …year = getNumber('y'); break; case '\'': if (lookAhead('\'')) { checkLiteral(); } else { literal = true;…+ date.getYear() % 100); break; case '\'': if (lookAhead('\'')) { output += '\''; } else { literal = true;… parser for c language help me 17 Years Ago by ~bleach~ …=cplusplus] int lexan() { int lookahead; lookahead=getchar(); return t; } int match(int t) { if(lookahead==t) lookahead=lexan(); else error(); return lookahead; } void error() { printf…') match('b'); else error(); } void AA() { if(lookahead=='a') match('a'); else error(); if(lookahead=='b') match('b'); else error(); } void BB… Re: parser for c language help me 17 Years Ago by Duoas …b', and return success or failure. [*][inlinecode]char lookahead[/inlinecode] should remain a local variable in [B]lexan…]match( [COLOR="Red"]'a'[/COLOR], &lookahead )[/inlinecode] [*][B]match[/B]() should return either success …or failure. If it succeeded, the lookahead variable should be modified to the next input. If… No errors reported -- but no positive data either. 13 Years Ago by billmudry … on line 240 is - $uvrow<BR />"; ///////////////////////////////////////////////////////////////////////////////////////////////////////// // UV Lookahead section ends ///////////////////////////////////////////////////////////////////////////////////////////////////////// $l++; // Increment counter to set maximum columns lengths… Re: No errors reported -- but no positive data either. 13 Years Ago by billmudry … line 240 is - $uvrow<BR />"; ///////////////////////////////////////////////////////////////////////////////////////////////////////// // UV Lookahead section ends ///////////////////////////////////////////////////////////////////////////////////////////////////////// $l++; // Increment counter to set maximum columns lengths… Need help with Delphi coding. 18 Years Ago by Necrobat …=10; player1color:TColor=clred; player2color:TColor=clyellow; boardcolor:TColor=clblue; lookahead:integer=4; type TFormGame = class(TForm) BtnExitGame: TButton; PnlGame: TPanel… Help: Text file to LinkedList 14 Years Ago by Mabyboi …;File cannot be read."); System.exit(0); } return current; } /** * Lookahead test for end of input * @return true if end of… help with pascal 12 Years Ago by blob84 …; { Constant Declarations } const TAB = ^I; { Variable Declarations } var Look: char; { Lookahead Character } { Read New Character From Input Stream } procedure GetChar; begin… Search for bytes that are located before a set of found bytes 7 Years Ago by random_1 … and it only works with int right? then i saw `lookahead` and `lookbehind` but i don't understand the docs. any… Shorten a regex lookahead and lookbehind 11 Years Ago by trishtren Hello, im currently working on a program to split a string based on symbols only, i need to seperate the string around the symbols whilst keeping the symbols as well eg. test_String_123_^; would result in an array containing : [test] [_] [String] [_] [123] [_] [^] However although i have achieved it with this code : exampelstring.split(&… Re: Shorten a regex lookahead and lookbehind 11 Years Ago by masijade How about not using split, and, instead, using pattern and matcher with `(([^_^]+)?([_^])?)` i.e. package bogustest; import java.util.regex.Matcher; import java.util.regex.Pattern; public class BogusTest { public static void main(String[] args) { String test = "test_String_123_^"; Pattern… Re: Shorten a regex lookahead and lookbehind 11 Years Ago by masijade As a note though, '^' is a special character ONLY when used as the first character within square brackets, and an '_' is NOT a special character, at all, so there was no reason for the \\\\ occurances in your initial regex. Re: Shorten a regex lookahead and lookbehind 11 Years Ago by sepp2k > '^' is a special character ONLY when used as the first character within square brackets `^` means "beginning of the line" outside of square brackets, so it does need to be escaped. You're right about `_` though. Re: Shorten a regex lookahead and lookbehind 11 Years Ago by masijade Ach, yeah, idiot. Inside square brackets it does NOT need to be escaped, however (unless it is to be the only character in the brackets, otherwise, simply do not make it the FIRST character within those brackets). Re: compiler 14 Years Ago by programing … int t; term(); while(1) switch (lookahead) { case '+': case'-': t =lookahead; match(lookahead); term(); emit(t,NONE); continue; default:… return 0; } } // parse parse() { lookahead= lexan(); while (lookahead != DONE) { expr(); match(';'); } } //init struct entry keywords… Re: Matching "pi" but not "pie" 18 Years Ago by MattEvans … [/inlinecode] It has a negative lookbehind (?<![\w\d]) and lookahead (?![\w\d]) for characters preceeding and following the word pi…. For more about lookahead/behinds: [URL]http://www.perl.com/pub/a/2003/07… Re: Not waiting for input during loop 17 Years Ago by vijayan121 … next character that is left is a non-whitespace character. lookahead is notoriously difficult to implement correctly in a portable manner…. the only lookahead that is guaranteed by the standard to succeed is the… Re: First and Follow method..?Pls help 17 Years Ago by Abzero … once you have processed the 1, you look at the lookahead and determine if it is in the follow set of… token stream which you can do two options with, peek (lookahead) and consume. you can then construct a parse as follows… Re: check is digit or chara 14 Years Ago by Narue …. The problem is that scanf is limited in terms of lookahead for validating the next character as well as limited in… terms of determining if such a lookahead approach is even what the programmer wanted. Re: Not waiting for input during loop 17 Years Ago by vijayan121 …;ws,sentance);[/inlinecode] would be sufficient. note: the problem of lookahead in a stream buffer is a difficult one, and [B… Re: Regular Expression 17 Years Ago by bradleykirby … allowed. I managed to use a condensed regex using a lookahead: [code] /(?=^[a-zA-Z0-9]{4,8}$)[a-zA-Z… Re: Function that deletes url from file with regular expression 16 Years Ago by Gribouillis You could try to match the url only if it's followed by a white space character or the end of the string, with a lookahead assertion like this [icode]r"\b%s(?=\s|$)" % url[/icode]. Alternatively, you could try to match the url if it's not followed by a slash like this [icode]r"\b%s(?![/])" % url[/icode] Re: Need some help composing objects at runtime 16 Years Ago by vidaj … charm :D Changed the regex to use negative lookbehind and lookahead to match the +, and a new regex to match the… Re: SLR(1) 15 Years Ago by pentiumpablo 1 token lookahead Re: Regex Pattern, needs a little tweak ? 15 Years Ago by pritaeas …-0-9][\w_\-\*\.]{2,14}$ [/code] which uses a negative lookahead to match a digit only username. For some reason starting… Re: Help with Regex 14 Years Ago by nick.crane …; is a grouping construct for a "Zero-width positive lookahead assertion". In other words, it looks forward to match… Re: Permutation Cipher 14 Years Ago by jon.kiparsky … from having an incomplete first pair. You might need some lookahead to handle this reasonably. And no, I don't have… Re: Merge Sorted Iterables 14 Years Ago by TrustyTony This could be maybe transformed to one item lookahead of stream (like ungetch is C), which I have thought sometimes to be usefull. Re: Merge Sorted Iterables 14 Years Ago by TrustyTony … feature I have been missing from python, doing one item lookahead for generators. Now Googling little there seems to be some…