PEGTL
sparsepp
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PEGTL | sparsepp | |
---|---|---|
12 | 4 | |
1,851 | 1,224 | |
1.8% | - | |
7.2 | 1.1 | |
11 days ago | 11 months ago | |
C++ | C++ | |
Boost Software License 1.0 | GNU General Public License v3.0 or later |
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.
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.
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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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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.
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A hand-written recursive descent parser for Lua 5.3, in Lua 5.3!
In case you are still fighting with left-recursion you might be interested in this: https://github.com/taocpp/PEGTL/blob/master/src/example/pegtl/lua53.hpp
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Ditch regex for parser combinators, a Rust / nom step-by-step guide
I've found https://github.com/taocpp/PEGTL to be easier to use than boost parser generators.
sparsepp
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Updating map_benchmarks: Send your hashmaps!
Also, I'm testing https://github.com/greg7mdp/sparsepp which is based on google's sparsehash
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Who here is ready to see some 64MB blocks on mainnet?
But it's pretty easy to address this. The CoinsViewCache's underlying storage is just a std::map<...>. A while ago, I replaced that with a sparsepp hashtable to improve the memory efficiency. It wasn't hard to do; took a couple of hours. We could do the same thing with a concurrent hashtable implementation. The hardest part of doing this would be picking an implementation and validating that it's mature and stable enough to be used in BCHN. Intel's Threading Building Blocks has some good candidates, but it's also possible that another implementation might be more suitable.
Hey thanks for the mention /u/jtoomim. I see that you used sparsepp in CoinsViewCache. A phmap::flat_hash_map would probably be similar for memory usage, but likely faster (because of parallel lookup with SSE instructions and contiguous memory storage in one array).
What are some alternatives?
lexy - C++ parsing DSL
cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
spirit - Boost.org spirit module
C++ B-tree - Git mirror of the official (mercurial) repository of cpp-btree
pybind11 - Seamless operability between C++11 and Python
Inja - A Template Engine for Modern C++
Hopscotch map - C++ implementation of a fast hash map and hash set using hopscotch hashing
sparsehash - C++ associative containers
lalrpop - LR(1) parser generator for Rust
Optional Argument in C++ - Named Optional Arguments in C++17
semver - Semantic Versioning for modern C++
Hashmaps - Various open addressing hashmap algorithms in C++