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use glob::glob;
use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::quote;
use std::{collections::HashSet, iter::FromIterator, ops::Sub};
use syn::{
self,
parse::{Parse, ParseStream, Result},
parse_macro_input,
punctuated::Punctuated,
Ident, LitStr, Path, Token,
};
struct GlobPattern {
inverted: bool,
pattern: LitStr,
}
impl Parse for GlobPattern {
fn parse(input: ParseStream) -> Result<Self> {
let inverted = input.parse::<Token![!]>().is_ok();
let pattern = input.parse()?;
Ok(GlobPattern { inverted, pattern })
}
}
type GlobPatternList = Punctuated<GlobPattern, Token![,]>;
struct FileTestsInput {
test_fn: Path,
globs: GlobPatternList,
}
impl Parse for FileTestsInput {
fn parse(input: ParseStream) -> Result<Self> {
let test_fn: Path = input.parse()?;
input.parse::<Token![=>]>()?;
let globs: GlobPatternList = input.parse_terminated(GlobPattern::parse)?;
Ok(FileTestsInput { test_fn, globs })
}
}
fn glob_all<'a>(patterns: impl Iterator<Item = &'a GlobPattern>) -> HashSet<std::path::PathBuf> {
patterns
.filter_map(|pattern| glob(pattern.pattern.value().as_str()).ok())
.flat_map(|paths| paths.filter_map(|path| path.ok()))
.collect()
}
#[proc_macro]
pub fn file_tests(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as FileTestsInput);
let glob_accepted = glob_all(input.globs.iter().filter(|pattern| !pattern.inverted));
let glob_rejected = glob_all(input.globs.iter().filter(|pattern| pattern.inverted));
let test_files = glob_accepted.sub(&glob_rejected);
let test_fn_name = input.test_fn.segments.last().unwrap().ident.to_string();
let fns_tokens = test_files.iter().enumerate().map(|(i, path)| {
let mut fn_name = path
.file_stem()
.map(|name| {
format!(
"test{}_{}_{}",
i,
test_fn_name,
name.to_str().expect("Invalid filename")
)
})
.expect("Invalid globbed path");
fn_name = fn_name
.chars()
.map(|ch| match ch {
'A'..='Z' | 'a'..='z' | '0'..='9' => ch,
_ => '_',
})
.collect();
let test_fn = &input.test_fn;
let abs_path = path.canonicalize().expect("Could not make absolute path");
let path_str = abs_path.to_str().expect("Invalid path");
let fn_ident = Ident::new(fn_name.as_str(), Span::call_site());
quote! {
#[test]
fn #fn_ident() {
let path = std::path::PathBuf::from(#path_str);
println!("Test file: {}", #path_str);
match std::fs::File::open(&path) {
Ok(file) => #test_fn(path, file),
Err(err) => panic!("Error loading test file: {}: {}", #path_str, err),
}
}
}
});
proc_macro2::TokenStream::from_iter(fns_tokens).into()
}