ethers-rs/ethers-contract/ethers-contract-abigen/src/util.rs

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use ethers_core::{
abi::{Param, ParamType},
types::Address,
};
use eyre::Result;
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use inflector::Inflector;
use proc_macro2::{Ident, Literal, Span, TokenStream};
use quote::quote;
use std::path::PathBuf;
use syn::{Ident as SynIdent, Path};
/// Expands a identifier string into a token.
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pub fn ident(name: &str) -> Ident {
Ident::new(name, Span::call_site())
}
/// Expands an identifier string into a token and appending `_` if the
/// identifier is for a reserved keyword.
///
/// Parsing keywords like `self` can fail, in this case we add an underscore.
pub fn safe_ident(name: &str) -> Ident {
syn::parse_str::<SynIdent>(name).unwrap_or_else(|_| ident(&format!("{name}_")))
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}
/// Converts a `&str` to `snake_case` `String` while respecting identifier rules
pub fn safe_snake_case(ident: &str) -> String {
safe_identifier_name(ident.to_snake_case())
}
/// Converts a `&str` to `PascalCase` `String` while respecting identifier rules
pub fn safe_pascal_case(ident: &str) -> String {
safe_identifier_name(ident.to_pascal_case())
}
/// respects identifier rules, such as, an identifier must not start with a numeric char
fn safe_identifier_name(name: String) -> String {
if name.starts_with(|c: char| c.is_numeric()) {
format!("_{name}")
} else {
name
}
}
/// converts invalid rust module names to valid ones
pub fn safe_module_name(name: &str) -> String {
// handle reserve words used in contracts (eg Enum is a gnosis contract)
safe_ident(&safe_snake_case(name)).to_string()
}
/// Expands an identifier as snakecase and preserve any leading or trailing underscores
pub fn safe_snake_case_ident(name: &str) -> Ident {
let i = name.to_snake_case();
ident(&preserve_underscore_delim(&i, name))
}
/// Expands an identifier as pascal case and preserve any leading or trailing underscores
pub fn safe_pascal_case_ident(name: &str) -> Ident {
let i = name.to_pascal_case();
ident(&preserve_underscore_delim(&i, name))
}
/// Reapplies leading and trailing underscore chars to the ident
/// Example `ident = "pascalCase"; alias = __pascalcase__` -> `__pascalCase__`
pub fn preserve_underscore_delim(ident: &str, alias: &str) -> String {
alias
.chars()
.take_while(|c| *c == '_')
.chain(ident.chars())
.chain(alias.chars().rev().take_while(|c| *c == '_'))
.collect()
}
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/// Expands a positional identifier string that may be empty.
///
/// Note that this expands the parameter name with `safe_ident`, meaning that
/// identifiers that are reserved keywords get `_` appended to them.
pub fn expand_input_name(index: usize, name: &str) -> TokenStream {
let name_str = match name {
"" => format!("p{index}"),
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n => n.to_snake_case(),
};
let name = safe_ident(&name_str);
quote! { #name }
}
/// Expands a doc string into an attribute token stream.
pub fn expand_doc(s: &str) -> TokenStream {
let doc = Literal::string(s);
quote! {
#[doc = #doc]
}
}
pub fn expand_derives(derives: &[Path]) -> TokenStream {
quote! {#(#derives),*}
}
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/// Parses the given address string
pub fn parse_address<S>(address_str: S) -> Result<Address>
where
S: AsRef<str>,
{
let address_str = address_str.as_ref();
eyre::ensure!(address_str.starts_with("0x"), "address must start with '0x'");
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Ok(address_str[2..].parse()?)
}
/// Perform an HTTP GET request and return the contents of the response.
#[cfg(not(target_arch = "wasm32"))]
pub fn http_get(_url: &str) -> Result<String> {
cfg_if::cfg_if! {
if #[cfg(feature = "reqwest")]{
Ok(reqwest::blocking::get(_url)?.text()?)
} else {
eyre::bail!("HTTP is unsupported")
}
}
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}
/// Replaces any occurrences of env vars in the `raw` str with their value
pub fn resolve_path(raw: &str) -> Result<PathBuf> {
let mut unprocessed = raw;
let mut resolved = String::new();
while let Some(dollar_sign) = unprocessed.find('$') {
let (head, tail) = unprocessed.split_at(dollar_sign);
resolved.push_str(head);
match parse_identifier(&tail[1..]) {
Some((variable, rest)) => {
let value = std::env::var(variable)?;
resolved.push_str(&value);
unprocessed = rest;
}
None => {
eyre::bail!("Unable to parse a variable from \"{}\"", tail)
}
}
}
resolved.push_str(unprocessed);
Ok(PathBuf::from(resolved))
}
fn parse_identifier(text: &str) -> Option<(&str, &str)> {
let mut calls = 0;
let (head, tail) = take_while(text, |c| {
calls += 1;
match c {
'_' => true,
letter if letter.is_ascii_alphabetic() => true,
digit if digit.is_ascii_digit() && calls > 1 => true,
_ => false,
}
});
if head.is_empty() {
None
} else {
Some((head, tail))
}
}
fn take_while(s: &str, mut predicate: impl FnMut(char) -> bool) -> (&str, &str) {
let mut index = 0;
for c in s.chars() {
if predicate(c) {
index += c.len_utf8();
} else {
break
}
}
s.split_at(index)
}
/// Returns a list of absolute paths to all the json files under the root
pub fn json_files(root: impl AsRef<std::path::Path>) -> Vec<PathBuf> {
walkdir::WalkDir::new(root)
.into_iter()
.filter_map(Result::ok)
.filter(|e| e.file_type().is_file())
.filter(|e| e.path().extension().map(|ext| ext == "json").unwrap_or_default())
.map(|e| e.path().into())
.collect()
}
/// rust-std derives `Default` automatically only for arrays len <= 32
///
/// Returns whether the corresponding struct can derive `Default`
pub fn can_derive_defaults(params: &[Param]) -> bool {
params.iter().map(|param| &param.kind).all(can_derive_default)
}
pub fn can_derive_default(param: &ParamType) -> bool {
const MAX_SUPPORTED_LEN: usize = 32;
match param {
ParamType::FixedBytes(len) => *len <= MAX_SUPPORTED_LEN,
ParamType::FixedArray(ty, len) => {
if *len > MAX_SUPPORTED_LEN {
false
} else {
can_derive_default(ty)
}
}
ParamType::Tuple(params) => params.iter().all(can_derive_default),
_ => true,
}
}
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#[cfg(test)]
mod tests {
use super::*;
#[test]
fn can_detect_non_default() {
let param = ParamType::FixedArray(Box::new(ParamType::Uint(64)), 128);
assert!(!can_derive_default(&param));
let param = ParamType::FixedArray(Box::new(ParamType::Uint(64)), 32);
assert!(can_derive_default(&param));
}
#[test]
fn can_resolve_path() {
let raw = "./$ENV_VAR";
std::env::set_var("ENV_VAR", "file.txt");
let resolved = resolve_path(raw).unwrap();
assert_eq!(resolved.to_str().unwrap(), "./file.txt");
}
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#[test]
fn input_name_to_ident_empty() {
assert_quote!(expand_input_name(0, ""), { p0 });
}
#[test]
fn input_name_to_ident_keyword() {
assert_quote!(expand_input_name(0, "self"), { self_ });
}
#[test]
fn input_name_to_ident_snake_case() {
assert_quote!(expand_input_name(0, "CamelCase1"), { camel_case_1 });
}
#[test]
fn parse_address_missing_prefix() {
let _ = parse_address("0000000000000000000000000000000000000000").unwrap_err();
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}
#[test]
fn parse_address_address_too_short() {
let _ = parse_address("0x00000000000000").unwrap_err();
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}
#[test]
fn parse_address_ok() {
let expected =
Address::from([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19]);
assert_eq!(parse_address("0x000102030405060708090a0b0c0d0e0f10111213").unwrap(), expected);
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}
#[test]
fn test_safe_module_name() {
assert_eq!(safe_module_name("Valid"), "valid");
assert_eq!(safe_module_name("Enum"), "enum_");
assert_eq!(safe_module_name("Mod"), "mod_");
assert_eq!(safe_module_name("2Two"), "_2_two");
}
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}