1 unstable release
0.7.4 | May 30, 2024 |
---|
#51 in #evm
1,680 downloads per month
Used in 18 crates
(2 directly)
47KB
1K
SLoC
linera-alloy-sol-type-parser
Simple and light-weight Solidity type strings parser.
This library is primarily a dependency for the user-facing APIs in
linera-alloy-json-abi
and linera-alloy-dyn-abi
. Please see the documentation for
those crates for more information.
This parser generally follows the Solidity spec, however, it supports only a subset of possible types, chosen to support ABI coding.
Usage
The TypeSpecifier
is the top-level type in this crate. It is a wrapper around
a section of a string (called a span
). It progressively breaks the strings
down into subspans, and adds metadata about the type. E.g. it tracks the stem
type as well as the sizes of array dimensions. A TypeSpecifier
is expected to
handle any valid Solidity type string.
use linera_alloy_sol_type_parser::TypeSpecifier;
use core::num::NonZeroUsize;
// Parse a type specifier from a string
let my_type = TypeSpecifier::parse("uint8[2][]").unwrap();
// Read the total span
assert_eq!(
my_type.span(),
"uint8[2][]"
);
// A type specifier has a stem type. This is the type string, stripped of its
// array dimensions.
assert_eq!(my_type.stem.span(), "uint8");
// Arrays are represented as a vector of sizes. This allows for deep nesting.
assert_eq!(
my_type.sizes,
// `None` is used for dynamic sizes. This is equivalent to `[2][]`
vec![NonZeroUsize::new(2), None]
);
// Type specifiers also work for complex tuples!
let my_tuple = TypeSpecifier::parse("(uint8,(uint8[],bool))[39]").unwrap();
assert_eq!(
my_tuple.stem.span(),
"(uint8,(uint8[],bool))"
);
// Types are NOT resolved, so you can parse custom structs just by name.
let my_struct = TypeSpecifier::parse("MyStruct").unwrap();
Why not support parse()
?
The core::str::FromStr
trait is not implemented for TypeSpecifier
because
of lifetime constraints. Unfortunately, it is impossible to implement this for
a type with a lifetime dependent on the input str. Instead, we recommend using
the parse
associated functions, or TryFrom::<&str>::try_from
if a trait is
needed.
Why not use syn
?
This is NOT a full syntax library, and is not intended to be used as a
replacement for linera-alloy-syn-solidity
. This crate is intended to be used for
parsing type strings present in existing ecosystem tooling, and nothing else.
It is not intended to be used for parsing Solidity source code.
This crate is useful for:
- syntax-checking JSON ABI files
- providing known-good input to
linera-alloy-dyn-abi
- porting ethers.js code to rust
It is NOT useful for:
- parsing Solidity source code
- generating Rust code from Solidity source code
- generating Solidity source code from rust code
Dependencies
~1MB
~16K SLoC