pub enum SExp {
Null,
Atom(Primitive),
Pair {
head: Box<SExp>,
tail: Box<SExp>,
},
}
An S-Expression. Can be parsed from a string via FromStr
, or constructed
programmatically.
use parsley::SExp;
let null = "()".parse::<SExp>().unwrap();
assert_eq!(null, SExp::Null);
use parsley::SExp;
let parsed = "\"abcdefg\"".parse::<SExp>().unwrap();
assert_eq!(parsed, SExp::from("abcdefg"));
Fields of Pair
Iterate over an S-Expression, by reference.
use parsley::prelude::*;
assert_eq!(
sexp![()].iter().next().unwrap(),
&SExp::Null
);
Easy way to check for Null
if you're planning on iterating
Get the length of an S-Expression (vector or list)
use parsley::prelude::*;
assert_eq!(
sexp!['a', "bee", SExp::sym("sea")].len(),
3
);
The natural way to build up a list - from the end to the beginning.
use parsley::prelude::*;
use parsley::SExp::Null;
let macro_list = sexp![SExp::sym("quote"), ()];
let cons_list = Null.cons(Null).cons(SExp::sym("quote"));
assert_eq!(macro_list, cons_list);
Convenience method to build a symbolic atom.
use parsley::prelude::*;
let mut ctx = Context::base();
assert!(ctx.eval(SExp::Null).is_err());
let result = ctx.run("null").unwrap();
assert_eq!(result, SExp::Null);
Printable type for an expression.
use parsley::SExp;
assert_eq!(SExp::Null.type_of(), "null");
assert_eq!(SExp::from(3).type_of(), "number");
assert_eq!(SExp::from(true).type_of(), "bool");
assert_eq!(SExp::from((5,)).type_of(), "list");
type Item = Self
The type of the elements being iterated over.
type IntoIter = SExpIterator
Which kind of iterator are we turning this into?
This method tests for self
and other
values to be equal, and is used by ==
. Read more
This method tests for !=
.
Performs copy-assignment from source
. Read more
Formats the value using the given formatter. Read more
Formats the value using the given formatter. Read more
The returned type after indexing.
Performs the indexing (container[index]
) operation.
The associated error which can be returned from parsing.
Parses a string s
to return a value of this type. Read more
The type of the elements being iterated over.
Which kind of iterator are we turning this into?
Creates owned data from borrowed data, usually by cloning. Read more
🔬 This is a nightly-only experimental API. (toowned_clone_into
)
recently added
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String
. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
🔬 This is a nightly-only experimental API. (try_from
)
The type returned in the event of a conversion error.
🔬 This is a nightly-only experimental API. (try_from
)
🔬 This is a nightly-only experimental API. (get_type_id
)
this method will likely be replaced by an associated static