Input to Lex is divided into three sections with%% dividing the sections. This is best illustrated by example. The first example is the shortest possible lex file:%% Input is copied to output one character at a time. The first%% is always required as there must always be a rules section. However if we don’t specify any rules then the.

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I'm having Lex and YACC files to parse my files (.l file and .y file).

How to compile those files and how to make equivalent .c file for them in windows platform?

Enamul HassanThorin OakenshieldThorin Oakenshield

9 Answers

As for today (2011-04-05, updated 2017-11-29) you will need the lastest versions of:

1. After that, do a full install in a directory of your preference without spaces in the name. I suggest C:GnuWin32. Do not install it in the default (C:Program Files (x86)GnuWin32) because bison has problems with spaces in directory names, not to say parenthesis.

2. Also, consider installing Dev-CPP in the default directory (C:Dev-Cpp)

3. After that, set the PATH variable to include the bin directories of gcc (in C:Dev-Cppbin) and flexbison (in C:GnuWin32bin). To do that, copy this: ;C:Dev-Cppbin;C:GnuWin32bin and append it to the end of the PATH variable, defined in the place show by this figure:
   If the figure is not in good resolution, you can see a step-by-step here.

4. Open a prompt, cd to the directory where your '.l' and '.y' are, and compile them with:

   1. flex hello.l
   2. bison -dy hello.y
   3. gcc lex.yy.c y.tab.c -o hello.exe

You will be able to run the program. I made the sources for a simple test (the infamous Hello World):

Hello.l

Hello.y

Edited: avoiding 'warning: implicit definition of yyerror and yylex'.

Pc games download. Disclaimer: remember, this answer is very old (since 2011!) and if you run into problems due to versions and features changing, you might need more research, because I can't update this answer to reflect new itens. Thanks and I hope this will be a good entry point for you as it was for many.

Updates: if something (really small changes) needs to be done, please check out the official repository at github: https://github.com/drbeco/hellex

Happy hacking.

Dr Beco

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Dr Beco

What you (probably want) are Flex 2.5.4 (some people are now 'maintaining' it and producing newer versions, but IMO they've done more to screw it up than fix any real shortcomings) and byacc 1.9 (likewise). (Edit 2017-11-17: Flex 2.5.4 is not available on Sourceforge any more, and the Flex github repository only goes back to 2.5.5. But you can apparently still get it from a Gnu ftp server at ftp://ftp.gnu.org/old-gnu/gnu-0.2/src/flex-2.5.4.tar.gz.)

Since it'll inevitably be recommended, I'll warn against using Bison. Bison was originally written by Robert Corbett, the same guy who later wrote Byacc, and he openly states that at the time he didn't really know or understand what he was doing. Unfortunately, being young and foolish, he released it under the GPL and now the GPL fans push it as the answer to life's ills even though its own author basically says it should be thought of as essentially a beta test product -- but by the convoluted reasoning of GPL fans, byacc's license doesn't have enough restrictions to qualify as 'free'!

riciJerry CoffinJerry Coffin

There are ports of flex and bison for windows here: http://gnuwin32.sourceforge.net/

flex is the free implementation of lex. bison is the free implementation of yacc.

RBerteiglesmanalesmana

You can find the latest windows version of flex & bison here: http://sourceforge.net/projects/winflexbison/

bakoyaroSkurmedelSkurmedel

Go for the full installation of Git for windows (with Unix tool), and bison and flex would come with it in the bin folder.

Archy Will HeArchy Will He

Also worth noting that WinFlexBison has been packaged for the Chocolatey package manager. Install that and then go:

..which at the time of writing contains Bison 2.7 & Flex 2.6.3.

There is also winflexbison3 which (at the time of writing) has Bison 3.0.4 & Flex 2.6.3.

Alastair MawAlastair Maw

the easiest method is to download and install cygwin and download gcc and flex packages during installation.Then to run a lex file for eg. abc.l

we write

flex abc.l

gcc lex.yy.c -o abc.exe

./abc.exe

I was having the same problem, it has a very simple solution.
Steps for executing the 'Lex' program:

1. Tools->'Lex File Compiler'
2. Tools->'Lex Build'
3. Tools->'Open CMD'
4. Then in command prompt type 'name_of_file.exe' example->'1.exe'
5. Then entering the whole input press Ctrl + Z and press Enter.

סטנלי גרונן

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I am very new to Lex and Yacc. I have a Lex program. Example: wordcount.l

I am using windows and putty.

I am just trying to run this file.

1. Does the wordcount.l file go on the C drive?

2. Do I compile the Lex program and it generates a .c program and then what do I run?

I tried on the command-line: Lex wordcount.l

but I just get file not found..

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wordcount.l

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In putty how do I compile and run this program?

Farshid

2 Answers

You first have to go to the directory which the file wordcount.l is in using cd. Then using lex wordcount.l will make the file lex.yy.c. To the run the program you need compile it with a c compiler such as gcc. With gcc you can compile it using gcc -lfl lex.yy.c. This will create a.out which can be run using ./a.out

Bilal Syed HussainBilal Syed Hussain

These also works. I am using this in Ubuntu 14.04.