libfsm
flex
| libfsm | flex | |
|---|---|---|
| 2 | 9 | |
| 912 | 3,443 | |
| - | - | |
| 8.4 | 8.4 | |
| 9 days ago | 1 day ago | |
| C | C | |
| BSD 2-clause "Simplified" License | GNU General Public License v3.0 or later |
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libfsm
flex
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How to provide input file for Flex++?
I am using Flex++, which is Flex for C++ and I am having trouble setting the input file. Flex++ uses the FlexLexer class provided in FlexLexer.h to create the lexer object(https://github.com/westes/flex/blob/master/src/FlexLexer.h). In my main function I have
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Do Regular Expressions only evaluate one line at a time?
Further applications of DFA and NFA: lex or flex, yacc or bison, and POE :-)
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Cool C projects
How about writing a programming language using Flex and Bison? There are lots of good tutorials and examples out there.
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Parser and Lexer bike-shedding
Some lexer generators (notably Flex) take input from a file handle by default. While you can always read a file into a string before passing it to the generated lexer, this is not seen as "the best" since you have to read in all the data into memory, which can be a lot.
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A Good Tool for Resuming Parsers?
Ages ago, I loved writing domain-specific toy languages, and almost always used flex to generate lexers and GNU bison to generate the parser. I've begun a new toy project and I don't think those two will cut it this time, so I'm looking for other tools that integrate well with C++.
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Please no
I don't understand :c don't lexers like Flex work off of regex rules? Isn't this the correct first step to parse it?
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A work in progress C compiler from scratch
I wrote a C compiler using flex [1] and bison [2]. The glue between them is a bit hacky.
At some point ANTLR [3] looked promising, but these days I'd probably write a lexer and recursive descent parser by hand, then generate LLVM IR.
[1] https://github.com/westes/flex
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Dealing with lex and yacc is DIFFICULT so little information is available about them!
github.com/westes/flex/releases
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Qual’è il commento più assurdo che avete mai trovato nel sorgente di un software?
Un commento in flex, uno storico software, tanto per mostrare che anche i migliori fanno le cose alla buona.
What are some alternatives?
mcc - MicroC example compiler for Stephen Edward's PLT class, but in Haskell
LKI - LKI's dotfiles.
maleeni - A lexer generator for golang
cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
RE-flex - A high-performance C++ regex library and lexical analyzer generator with Unicode support. Extends Flex++ with Unicode support, indent/dedent anchors, lazy quantifiers, functions for lex and syntax error reporting and more. Seamlessly integrates with Bison and other parsers.
imp - Imp is a statically typed and compiled scripting language with the goal of increasing programmer confidence.
c_fsm_generator - FSM generator for C
ocean - Programming language that compiles into a x86 ELF executable.
visual-automata - Visual Automata is a Python 3 library built as a wrapper for the Automata library to add more visualization features.
Apollo-11 - Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.
apli - The Abstract Programming Language Interface (APLI) is a framework for generating Abstract Syntax Trees (ASTs) to enable developers to create domain-specific languages faster.
owl - A parser generator for visibly pushdown languages.