packcc
rust-peg
packcc | rust-peg | |
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2 | 10 | |
317 | 1,388 | |
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4.3 | 3.6 | |
8 days ago | 3 days ago | |
C | Rust | |
GNU General Public License v3.0 or later | MIT License |
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packcc
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A glimpse into the universe where Windows died with the 1980s
There are languages with perfectly clean grammars which can't be parsed by yacc because they aren't LALR(1).
I agree that a command processor should have a grammar that can be expressed in a well-known formalism, and its parser generated by a parser generator.
I agree that both POSIX shell and CMD.EXE are flawed because that isn't true.
What I'm disagreeing with, is that it is important that the grammar formalism be LALR(1) in particular, and that the parser generator be yacc in particular.
Suppose I have a Packrat parser generator. [0] And my command processor has a nice clean PEG grammar. And I use the Packrat parser generator to generate the parser of my command processor. That grammar quite possibly isn't LALR(1), and hence yacc in particular won't be able to generate a parser for it. But what's the problem with that? If it is a problem at all, it is a very different problem than the problem that CMD.EXE and POSIX shell have
[0] e.g. https://github.com/arithy/packcc
- PackCC a PEG parser generator for C
rust-peg
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nom > regex
And some related parser tools: - https://github.com/kevinmehall/rust-peg - https://github.com/pest-parser/pest - https://github.com/lalrpop/lalrpop
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Letlang — Roadblocks and how to overcome them - My programming language targeting Rust
Rust is a very nice langage for implementing compilers, and has a nice ecosystem for it (logos, rust-peg, lalrpop, astmaker -- this one is mine --, etc...).
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Is there a parsing library (lexer?) which can handle generic tokens?
My peg crate is a parser generator that supports arbitrary token types as input. See https://github.com/kevinmehall/rust-peg/blob/master/tests/run-pass/tokens.rs for an example.
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Hey Rustaceans! Got a question? Ask here! (51/2022)!
The one rust parser-generator I used is PEG
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Hey Rustaceans! Got a question? Ask here! (29/2022)!
The two parser generators that I am aware of are lalrpop and PEG. There both great, and have seen some use by languages that have been written in Rust.
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Domain Specific Language embedded in Rust
rust-peg
- One Letter Programming Languages
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Using Nom - a parser combinator library
I wanted to create a parser for Apertium Stream. In 2014, I used Whittle in Ruby. If this year were 2001, I would use Lex/Yacc. Anyway, this year is 2021. I wanted to create this parser in Rust. I tried to find what is similar to Lex/Yacc. I found Rust-Peg. I found a link to Nom from Rust-Peg's document. My first impression was Nom example is easy to read. At least, its document claimed Nom is fast.
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Hey Rustaceans! Got an easy question? Ask here (5/2021)!
The peg crate has a resolved issue about this.
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Rust is the second most used language for Advent of Code, after Python
I don't really know that much about parsing and grammars, other than what I've learned about regular languages and expressions and context-free languages in a standard Theory of Comp course from my university. I basically just learned peg by reading the Wikipedia article on PEGs, reading the crate documentation to understand the syntax, and then looking at some of the peg examples on their GitHub to understand how it works in practice.
What are some alternatives?
npeg - PEGs for Nim, another take
pest - The Elegant Parser
PeppaPEG - PEG Parser in ANSI C
nom - Rust parser combinator framework
cparse - cparse is an LR(1) and LALR(1) parser generator
lalrpop - LR(1) parser generator for Rust
chomp - A fast monadic-style parser combinator designed to work on stable Rust.
rust-bison-skeleton - Bison frontend for Rust
pom - PEG parser combinators using operator overloading without macros.
rust-csv - A CSV parser for Rust, with Serde support.
oak - A typed parser generator embedded in Rust code for Parsing Expression Grammars
rust - Empowering everyone to build reliable and efficient software.