cpp-peglib
flex
| cpp-peglib | flex | |
|---|---|---|
| 4 | 10 | |
| 927 | 3,676 | |
| - | - | |
| 6.2 | 7.8 | |
| about 2 months ago | 6 days ago | |
| C++ | C | |
| MIT License | GNU General Public License v3.0 or later |
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cpp-peglib
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-🎄- 2022 Day 13 Solutions -🎄-
I used yhirose's PEG (parsing expression grammar) libraryfor parsing.
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What are some cool modern libraries you enjoy using?
By the same author, https://github.com/yhirose/cpp-peglib is also very nice.
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A Good Tool for Resuming Parsers?
Most of the research into this sort of incremental and differential parsing unsurprisingly looks to be in the Haskell community, but I was hoping that someone here might know of some C++-friendly tools that might support generating parsers that support interruption and resuming. cpp-peglib looked really promising, but its parsers don't look like they can be engaged from any but the initial state.
- yhirose/cpp-peglib - A single file C++ header-only PEG (Parsing Expression Grammars) library
flex
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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.
What are some alternatives?
PEGTL - Parsing Expression Grammar Template Library
LKI - LKI's dotfiles.
ctpg - Compile Time Parser Generator is a C++ single header library which takes a language description as a C++ code and turns it into a LR1 table parser with a deterministic finite automaton lexical analyzer, all in compile time.
ocean - Programming language that compiles into a x86 ELF executable.
scnlib - scanf for modern C++
imp - Imp is a statically typed and compiled scripting language with the goal of increasing programmer confidence.
filter_spirit - Advanced item filter generator for Path of Exile that uses it's own DSL and online item price APIs
owl - A parser generator for visibly pushdown languages.
scope_guard - A modern C++ scope guard that is easy to use but hard to misuse.
WebKit - Home of the WebKit project, the browser engine used by Safari, Mail, App Store and many other applications on macOS, iOS and Linux.
AdventOfCode
libfsm - DFA regular expression library & friends