lalrpop | LR parser generator for Rust | Parser library

by lalrpop Rust Version: 0.19.12 License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | lalrpop Summary

lalrpop is a Rust library typically used in Utilities, Parser applications. lalrpop has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

LALRPOP is a Rust parser generator framework with usability as its primary goal. You should be able to write compact, DRY, readable grammars. To this end, LALRPOP offers a number of nifty features:. Despite its name, LALRPOP in fact uses LR(1) by default (though you can opt for LALR(1)), and really I hope to eventually move to something general that can handle all CFGs (like GLL, GLR, LL(*), etc).

Support

Quality

Security

License

Reuse

Support

lalrpop has a medium active ecosystem.

It has 2587 star(s) with 268 fork(s). There are 34 watchers for this library.

It had no major release in the last 6 months.

There are 162 open issues and 218 have been closed. On average issues are closed in 137 days. There are 11 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of lalrpop is 0.19.12

Quality

lalrpop has 0 bugs and 0 code smells.

Security

lalrpop has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

lalrpop code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

lalrpop is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

lalrpop releases are not available. You will need to build from source code and install.

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lalrpop Key Features

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lalrpop Examples and Code Snippets

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Community Discussions

Trending Discussions on lalrpop

Preferring shift over reduce in parser for language without statement terminators

Where does the static requirement come from?

QUESTION

Preferring shift over reduce in parser for language without statement terminators

Asked 2022-Jan-04 at 06:17

I'm parsing a language that doesn't have statement terminators like ;. Expressions are defined as the longest sequence of tokens, so 5-5 has to be parsed as a subtraction, not as two statements (literal 5 followed by a unary negated -5).

I'm using LALRPOP as the parser generator (despite the name, it is LR(1) instead of LALR, afaik). LALRPOP doesn't have precedence attributes and doesn't prefer shift over reduce by default like yacc would do. I think I understand how regular operator precedence is encoded in an LR grammar by building a "chain" of rules, but I don't know how to apply that to this issue.

The expected parses would be (individual statements in brackets):

...

ANSWER

Answered 2022-Jan-04 at 06:17

The issue you're going to have to confront is how to deal with function calls. I can't really give you any concrete advice based on your question, because the grammar you provide lacks any indication of the intended syntax of functions calls, but the hint that print(5) is a valid statement makes it clear that there are two distinct situations, which need to be handled separately.

Consider:

Source https://stackoverflow.com/questions/70571344

QUESTION

Where does the static requirement come from?

Asked 2020-Oct-13 at 04:14

I have a very small repo which currently does not compile, with the following error:

...

ANSWER

Answered 2020-Oct-12 at 18:23

Since str is a sort of slice, it can not outlive its parent. The result on trim is really just a slice the original string.

Source https://stackoverflow.com/questions/64321515

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install lalrpop

You can download it from GitHub.
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.