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combine
(Previously parser-combinators)
An implementation of parser combinators for Rust, inspired by the Haskell library Parsec. As in Parsec the parsers are LL(1) by default but they can opt-in to arbitrary lookahed using the try combinator.
A parser combinators is, broadly speaking, a function which takes several parsers as arguments and returns a new parser, created by combining those parsers. For instance, the many parser takes one parser, p
, as input and returns a new parser which applies p
zero or more times.
The library is mostly stable but a few parts of the internals may still change. If you end up trying it I welcome any feedback from your experience with it.
##Example
extern crate combine;
use ;
use letter;
let result = many.parse;
assert_eq!;
More examples can be found in the examples and benches folders.
Links
Extra
There is an additional crate which has parsers to lex and parse programming languages in combine-language.
Breaking changes
Here is a list containing most of the breaking changes in older versions of combine (parser-combinators).
1.0.0-beta.2
Info<T>
andError<T>
has had their signatures changed toInfo<T, R>
andError<T, R>
.Info
has a new variant which is specified byR
and defines the type for range errors.ParseError<T: Positioner>
has been changed toParseError<S: Stream>
(S is the stream type of the parser).- If you were using
ParseResult
from primitives you should no longer specify the item type of the stream.
0.7.0
Stream::uncons
changed its signature to allow it to return errors. ReturnError::end_of_input()
instead of()
if you implementedStream
.
0.6.0
- Addition of
Parser::parse_lazy
, should not break anything but I can't say for certain.
0.5.0
any_char
->any
,uncons_char
->uncons
- Introduction of the
Positioner
trait which needs to be implemented on an custom token types. satisfy
is moved to thecombinators
module and made generic, might cause type inference issues.
0.4.0
any_char
is no longer a free function but returns a parser when called as all parser functions (and its calledany
after 0.5.0)Cow
is replaced byInfo
in the error messages.
0.3.2 / 0.3.0
- Added variant to
Error
which can hold any kind of::std::error::Error
choice_vec
andchoice_slice
is replaced by justchoice
0.2.6
- Iterators cannot directly be used as streams but must be wrapped using
from_iter
function
If you have trouble updating to a newer version feel free to open an issue and I can take a look.