PEGTL
Code-used-on-Daniel-Lemire-s-blog
PEGTL | Code-used-on-Daniel-Lemire-s-blog | |
---|---|---|
12 | 24 | |
1,869 | 793 | |
1.0% | - | |
7.2 | 9.4 | |
7 days ago | 9 days ago | |
C++ | C | |
Boost Software License 1.0 | - |
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PEGTL
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Show HN: Matcheroni, a tiny C++20 header library for building lexers/parsers
Very cool, and I like the name!
I'd be interested in reading about how Matcheroni compares with PEGTL and Lexy.
https://github.com/taocpp/PEGTL
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Use PEGTL to remove my clunky homemade parser
I found a library I wanted to test: Pegtl
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What are some cool modern libraries you enjoy using?
I like PEGTL
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Are C/C++ developers allowed to import libraries to make coding easier or are they expected to build every functions and methods from scratch (without importing anything like String.h)?
Sure - libraries that are expected to be entirely self-contained. The one that comes to mind is PEGTL, a parser combinator library that is intended to be embedded inside a larger program. Making it import more dependencies would break this philosophy. Similarly, in the Rust world, there are a variety of "no-std" crates that should be able to be imported even if the standard library is not available on the target platform.
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TIL: Visual Studio has quantum state values 🤨
The program in the post was just an example meant to illustrate the problem. Originally, this (new) behavior of MSVC broke my code in the PEGTL, see [this commit](https://github.com/taocpp/PEGTL/commit/e3c8cb499dc3d1d76d23f2d5d79469dcb15550c5) that I needed to apply to fix it.
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We Built a C++ Rendering Engine for the Web
As a professional C++ programmer I feel a lot of the reasons C++ gets this response is because it's simply not "batteries included" like Go or Rust.
C++ is a very powerful, unopinionated language, that gives you a lot of freedom to attack your problem domain the way you best see fit.
If you're writing a networked application, don't use POSIX sockets, go and find a higher level library. If you're parsing complex text formats, don't iterate over buffers with char*'s, go pick up PEGTL[0]. If you're working on graphs, or need to properly index in-memory data, go pick up Boost[1][2]. If you need a GUI, go pick up Qt.
It's extremely common in C++, due to the lack of a universal package management solution, for people to try and "muddle through" and do shit themselves when it's far outside their core competency.
At one of my last employers, the core product was parsing JSON with std::regex, simply because they couldn't be bothered to integrate a JSON library.
[0] https://github.com/taocpp/PEGTL
[1] https://www.boost.org/doc/libs/1_76_0/libs/graph/
[2] https://www.boost.org/doc/libs/1_76_0/libs/multi_index/doc/i...
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Is there anything like sly for C++?
You are looking for Boost.Spirit (https://www.boost.org/doc/libs/1_76_0/libs/spirit/doc/x3/html/index.html) or PEGTL (https://github.com/taocpp/PEGTL)
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Why no more Lex/Yakk/ANTLR/whatever?
I personally prefer to use parsing combinator libraries in C++, where the "grammar" is just part of normal C++ and directly integrate. Examples are Boost.Spirit, pegtl, or (my own) lexy.
- Rust's Most Unrecognized Contributor
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Wondered if anyone is interested in a c++ parser combinators library?
While I'm not quite sure how this might transfer to your approach, with your Haskell-inspired style being quite different from our C++ templates, in the PEGTL our equivalent to your Char, which is called one, is variadic (true to the T in PEGTL a variadic template) and takes a list of possible matches.
Code-used-on-Daniel-Lemire-s-blog
- Estimating Your Memory Bandwidth
- First 96-Core AMD Zen 4 Threadripper Tests Show Utter Domination over Intel
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Parsing time stamps faster with SIMD instructions
It's not bad at all https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/...
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Under Linux, libSegFault and addr2line are underrated
A newline is missing in the example code. As given there's a segfault at line 5 not line 6.
However, the code at https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/... shows it's indeed at line 6, because it has an extra newline after the '#include '.
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Best Websites For Coders
Daniel Lemire's Blog : Daniel Lemire's blog
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Technical Blogs You Recommend?
Dr. Daniel Lemire's blog: https://lemire.me/blog, covers lots of technical items on optimizations in various programming languages, Lemire's work is currently in use across a number of projects and he consistently delivers fantastic improvements, he usually accompanies these improvements with a blog post describing what he did. He also occasionally posts interesting Science and Technology links on various topics not limited to tech, but health and education as well.
- suggest some c language blogs....
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What are some cool modern libraries you enjoy using?
Nope, simdjson is originally from Daniel Lemire who also often blogs about fancy low level optimizations: https://lemire.me/blog/ I'm just a happy user :)
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Escaping strings faster with AVX-512
Added this pull request with some interesting results.
There's a copy of the loop used on the escape function inside the avx512_escape function [0]. Is it needed or just a copy and paste mistake? (I know nothing about vector instructions)
0: https://github.com/lemire/Code-used-on-Daniel-Lemire-s-blog/...
What are some alternatives?
lexy - C++ parsing DSL
FastPFor - The FastPFOR C++ library: Fast integer compression
cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
farmhash - Automatically exported from code.google.com/p/farmhash
spirit - Boost.org spirit module
rust - Empowering everyone to build reliable and efficient software.
C++ B-tree - Git mirror of the official (mercurial) repository of cpp-btree
simonwillisonblog - The source code behind my blog
pybind11 - Seamless operability between C++11 and Python
developer-roadmap - Interactive roadmaps, guides and other educational content to help developers grow in their careers.
sparsepp - A fast, memory efficient hash map for C++
cheatsheets - Cheatsheets for web development - devhints.io