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use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::{format_ident, quote};
use syn::{
parse_macro_input, FnArg, ItemFn, PatType, ReturnType,
Visibility,
};
/**
* wrap webtest annotated functions in an async Pin<Box>
**/
pub fn webtest_impl(_args: TokenStream, input: TokenStream) -> TokenStream {
let input_fn = parse_macro_input!(input as ItemFn);
if let Err(err) = validate_function(&input_fn) {
return syn::Error::new(Span::call_site(), err)
.to_compile_error()
.into();
}
let fn_name = &input_fn.sig.ident;
let fn_name_str = fn_name.to_string();
let vis = &input_fn.vis;
let attrs = &input_fn.attrs;
let fn_block = &input_fn.block;
let fn_inputs = &input_fn.sig.inputs;
let fn_output = &input_fn.sig.output;
let fn_generics = &input_fn.sig.generics;
let fn_asyncness = &input_fn.sig.asyncness;
let original_fn_name = format_ident!("{}_original", fn_name);
let expanded = quote! {
#(#attrs)*
#vis #fn_asyncness fn #original_fn_name #fn_generics(#fn_inputs) #fn_output #fn_block
fn #fn_name #fn_generics(
driver: &::thirtyfour::WebDriver
) -> ::std::pin::Pin<Box<dyn ::std::future::Future<Output = crate::TestResult> + Send + '_>> {
Box::pin(async move {
#original_fn_name(driver).await
})
}
::inventory::submit! {
crate::TestFunction {
name: #fn_name_str,
func: #fn_name,
}
}
};
TokenStream::from(expanded)
}
fn validate_function(func: &ItemFn) -> Result<(), String> {
is_async(func)?;
is_visible(func)?;
matches_arguments(&["WebDriver"], func)?;
matches_return_type("TestResult", func)?;
Ok(())
}
fn is_async(func: &ItemFn) -> Result<(), String> {
if func.sig.asyncness.is_none() {
Err("Test functions must be async".to_string())
} else { Ok(()) }
}
fn is_visible(func: &ItemFn) -> Result<(), String> {
match func.vis {
Visibility::Inherited | Visibility::Public(_) => {
Ok(())
}
_ => {
Err("Test functions should be pub or have default visibility".to_string())
}
}
}
fn matches_arguments(types: &[&str], func: &ItemFn) -> Result<(), String> {
let args = matches_argument_count(types.len(), func)?;
for index in 0..args.len() {
matches_argument_type(types.get(index).unwrap(), args.get(index).unwrap())?;
}
Ok(())
}
fn matches_argument_count(expected: usize, func: &ItemFn) -> Result<Vec<&FnArg>, String> {
let inputs: Vec<_> = func.sig.inputs.iter().collect();
if inputs.len() != expected {
Err(format!("Test functions must take exactly {} parameters", expected))
} else { Ok(inputs) }
}
fn matches_argument_type(expected: &str, arg: &FnArg) -> Result<(), String> {
match arg {
FnArg::Receiver(_) => {
Err("Test functions cannot be methods (no self parameter)".to_string())
}
FnArg::Typed(PatType { ty, .. }) => {
let type_str = quote!(#ty).to_string();
if !type_str.contains(expected) {
Err("First parameter must be &WebDriver".to_string())
} else { Ok(()) }
}
}
}
fn matches_return_type(expected: &str, func: &ItemFn) -> Result<(), String> {
match &func.sig.output {
ReturnType::Default => {
Err("Test functions must return TestResult".to_string())
}
ReturnType::Type(_, ty) => {
let type_str = quote!(#ty).to_string();
if !type_str.contains(expected) && !type_str.contains("Result") {
Err("Test functions must return TestResult".to_string())
} else { Ok(()) }
}
}
}
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