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

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use ethers_core::types::Address;
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use anyhow::{anyhow, Result};
use inflector::Inflector;
use proc_macro2::{Ident, Literal, Span, TokenStream};
use quote::quote;
use syn::{Ident as SynIdent, Path};
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/// Expands a identifier string into an token.
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)))
}
/// 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),
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();
if !address_str.starts_with("0x") {
return Err(anyhow!("address must start with '0x'"))
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}
Ok(address_str[2..].parse()?)
}
#[cfg(not(target_arch = "wasm32"))]
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/// Perform an HTTP GET request and return the contents of the response.
pub fn http_get(url: &str) -> Result<String> {
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Ok(reqwest::blocking::get(url)?.text()?)
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}
#[cfg(test)]
mod tests {
use super::*;
#[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() {
assert!(
!parse_address("0000000000000000000000000000000000000000").is_ok(),
"parsing address not starting with 0x should fail"
);
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}
#[test]
fn parse_address_address_too_short() {
assert!(
!parse_address("0x00000000000000").is_ok(),
"parsing address not starting with 0x should fail"
);
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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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}
}