flex
The Fast Lexical Analyzer - scanner generator for lexing in C and C++ (by westes)
imp
Imp is a statically typed and compiled scripting language with the goal of increasing programmer confidence. (by imp-language)
Nutrient - The #1 PDF SDK Library
Bad PDFs = bad UX. Slow load times, broken annotations, clunky UX frustrates users. Nutrient’s PDF SDKs gives seamless document experiences, fast rendering, annotations, real-time collaboration, 100+ features. Used by 10K+ devs, serving ~half a billion users worldwide. Explore the SDK for free.
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| flex | imp | |
|---|---|---|
| 10 | 2 | |
| 3,698 | 11 | |
| 0.9% | - | |
| 7.6 | 0.0 | |
| 4 days ago | over 2 years ago | |
| C | Java | |
| GNU General Public License v3.0 or later | Apache License 2.0 |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
flex
Posts with mentions or reviews of flex.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2024-06-01.
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Building Zerocalc, part I - rustc lexer and a lexer in rust
In this post, we will focus on tokenization. There are many ways to do tokenization, including using regular expressions or generating tokenizer code with generators such as flex. But what if we check how rustc's parser does it?
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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.
imp
Posts with mentions or reviews of imp.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2021-09-01.
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September 2021 monthly "What are you working on?" thread
In August I finished the module system for Imp. I’ve been designing Imp from the start to support the programmer’s confidence in their code, and the module system is no different. Imp is based on the JVM so each file eventually becomes one (or more) classes but that’s abstracted away from the user. This sub’s Discord has been so helpful for asking people about these concepts and for opinions on my design decisions.
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A work in progress C compiler from scratch
I've had good luck with ANTLR4 and ObjWeb ASM for my JVM language Imp https://github.com/mh15/imp
What are some alternatives?
When comparing flex and imp you can also consider the following projects:
libfsm - DFA regular expression library & friends
ocean - Programming language that compiles into a x86 ELF executable.
cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
OpenJ9 - Eclipse OpenJ9: A Java Virtual Machine for OpenJDK that's optimized for small footprint, fast start-up, and high throughput. Builds on Eclipse OMR (https://github.com/eclipse/omr) and combines with the Extensions for OpenJDK for OpenJ9 repo.
LKI - LKI's dotfiles.
konna - A fast functional language based on two level type theory
durin - the Dependent Unboxed higher-oRder Intermediate Notation
RIOT - RIOT - The friendly OS for IoT
pika - A WIP little dependently-typed systems language
Xee-xCode-4.5 - Xee source code for xCode 4.5
Cwerg - The best C-like language that can be implemented in 10kLOC.
Nutrient - The #1 PDF SDK Library
Bad PDFs = bad UX. Slow load times, broken annotations, clunky UX frustrates users. Nutrient’s PDF SDKs gives seamless document experiences, fast rendering, annotations, real-time collaboration, 100+ features. Used by 10K+ devs, serving ~half a billion users worldwide. Explore the SDK for free.
nutrient.io
featured