Hallo Rudi, I dont get the error, please can you help me out, here is the .l and .y file.thanks. %{ #include "ifanw.tab.h" extern int yylval; %} %% "=" { return EQ; } "!=" { return NE; } "<" { return LT; } "<=" { return LE; } ">" { return GT; } ">=" { return GE; } "+" { return PLUS; } "-" { return MI...
I am embarking on some learning and I want to write my own syntax highlighting for files in C++. Can anyone give me ideas on how to go about doing this? To me it seems that when a file is opened: It would need to be parsed and decided what type of source file it is. Trusting the extension might not be fool-proof A way to know what ...
hallo, i have a problem, the followed program gives back an error, error:: Undeclared(first use in function), why this error appears all tokens are declared, but this error comes, can anyone help me, here are the lex and yac files.thanks lex: %{ int yylinenu= 1; int yycolno= 1; %} %x STR DIGIT [0-9] ALPHA ...
How can I make PCCTS track the number of the tokens columns? ...
Hallo everybody, Can someone help me out of my situation, im searching for a instrucior that implements the JMP (Jump) instructior like in Assembler. I've found out that it could be withe the goto function of Flex/Bison but i have no really idea how to do. Have got anyone idea. Im very grateful of yours help. Thanks. Here is an example ...
Hallo, I need help in Lex/Yacc Programming. I wrote a compiler for a syntactical analysis for inputs of many statements. Now i have a special problem. In case of an Input the compiler gives the right output, which statement is uses, constant operator or a jmp instructor to which label, now i have to write so, if now a if statement com...
Hi All, I am very new to Flex/Bison, So it is very navie question. Pardon me if so. May look like homework question - but I need to implement project based on below concept. My question is related to two parts, Question 1 In Bison parser, How do I provide rules for optional input. Like, I need to parse the statment Example : ...
I am making a lexer, don't tell me to not do because I already did most of it. Currently it makes an array of tokens and that's it. I would like to know, what functions the lexer needs to provide and a brief explanation of what each function needs to do. I'll accept the most complete list. An example function would be: next: Consume ...
Are you aware of any lexical analyzer or lexer in Qt? I need it for parsing text files. ...
I'm getting started with Haskell and I'm trying to use the Alex tool to create regular expressions and I'm a little bit lost; my first inconvenience was the compile part. How I have to do to compile a file with Alex?. Then, I think that I have to import into my code the modules that alex generates, but not sure. If someone can help me, I...
I am presently learning Lexical Analysis in Compiler Design. In order to learn how really a lexical analyzer works I am trying to build one myself. I am planning to build it in Java. The input to the lexical analyzer is a .tex file which is of the following format. \begin{document} \chapter{Introduction} \section{Scope} ...
I am reading the dragon book. Quoting the text from the book (3.1.4 Lexical errors, Pno 114) It is hard for a lexical analyzer to tell, without the aid of other components, that there is a source-code error. For instance, if the string fi is encountered for the first time in a C program in the context: fi ( a == f(x) ) ....
What are some good ways to visualize a word-like document? Edit: It doesn't have to be a .doc, it could be a text file or blog post... ...
If you are forced to simplify C# keywords that can be used for looping, choose only one you want to preserve. for do-while while goto-label-if foreach Is there any performance consideration regarding your decision? Actually I don't know the internal mechanism of them, so here I want interview those of you know the details. However...
During the Compiler Design Lab hours, I'm using JLex as the Lexical Analyzer Generator, which produces a Java program from a lexical specification. I'd like to know if there are other tools which can help me in the same by generating C/C++/C# or VB programs instead of a Java program, and can run in Windows. ...
I'm looking for a free open-source Javascript/ECMAScript compiler or lexical analyzer, in order to compile javascript code to an executable that can run on Linux. I understand that I will probably need to add some objects/APIs for the javascript code to be able to perform operations within the O/S. I was hoping that some of this work h...
Hey, I'm creating a C Lexical analyzer using python as part of developing a parser.Here in my code i have written some methods for identifying keywords,numbers,operators etc. No error is shown after compiling. While executing i could input a .c file.My output should list all the keywords,identifiers etc in the input file. But it is not ...