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(LALRPOP
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:
- Nice error messages in case parser constructor fails.
- Macros that let you extract common parts of your grammar. This
means you can go beyond simple repetition likeId*and define
things likeComma<Id>for a comma-separated list of identifiers. - Macros can also create subsets, so that you easily do something
likeExpr<"all">to represent the full range of expressions, but
Expr<"if">to represent the subset of expressions that can appear
in anifexpression. - Builtin support for operators like
*and?. - Compact defaults so that you can avoid writing action code much of the
time. - Type inference so you can often omit the types of nonterminals.
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).
Documentation
The LALRPOP book covers all things LALRPOP -- or at least it intends
to! Here are some tips:
- The tutorial covers the basics of setting up a LALRPOP parser.
- For the impatient, you may prefer the quick start guide section, which describes
how to add LALRPOP to yourCargo.toml. - The advanced setup chapter shows how to configure other aspects of LALRPOP's
preprocessing. - If you have any questions join our gitter lobby.
Example Uses
- LALRPOP is itself implemented in LALRPOP.
- Gluon is a statically typed functional programming language.
- Gleam is a statically typed functional programming language for the Erlang VM.
- RustPython is Python 3.5+ rewritten in Rust
- Solang is Ethereum Solidity rewritten in Rust
Contributing
You really should read CONTRIBUTING.md if you intend to change LALRPOP's own grammar.