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Add some tests for regex syntax support

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Some functionality is only supported because the regex is built with the
Unicode flag instead of the UnicodeSets flag, but that's done for
backwards compatibility as the latter disallows some syntax that may be
in use.
This commit is contained in:
Oliver Hamlet
2026-01-18 21:33:23 +00:00
parent 9c59d87f23
commit 55510729ca
2 changed files with 254 additions and 5 deletions
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array-parameterized-test/src/lib.rs
+55 -5
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@@ -1,4 +1,4 @@
use proc_macro2::{Group, TokenStream};
use proc_macro2::{Group, TokenStream, TokenTree};
use quote::{ToTokens, format_ident, quote};
use syn::{Expr, Ident, ItemConst, ItemFn, Token, parse, parse_macro_input};
@@ -122,11 +122,45 @@ pub fn generate_tests(input: proc_macro::TokenStream) -> proc_macro::TokenStream
.step_by(2)
.enumerate()
.flat_map(|(i, value)| {
let suffix = value
.to_string()
let suffix = string_value(&value)
.escape_default()
.collect::<String>()
.replace(|c: char| !c.is_ascii_alphanumeric(), "_");
.map(|c| match c {
' ' => "_space_".to_owned(),
'!' => "_exclamation_mark_".to_owned(),
'"' => "_double_quote_".to_owned(),
'#' => "_hash_sign_".to_owned(),
'$' => "_dollar_sign_".to_owned(),
'%' => "_percent_sign_".to_owned(),
'&' => "_ampersand_".to_owned(),
'\'' => "_single_quote_".to_owned(),
'(' => "_opening_parenthesis_".to_owned(),
')' => "_closing_parenthesis_".to_owned(),
'*' => "_asterisk_".to_owned(),
'+' => "_plus_sign_".to_owned(),
',' => "_comma_".to_owned(),
'-' => "_hyphen_".to_owned(),
'.' => "_period_".to_owned(),
'/' => "_slash_".to_owned(),
':' => "_colon_".to_owned(),
';' => "_semicolon_".to_owned(),
'<' => "_less_than_sign_".to_owned(),
'=' => "_equals_sign_".to_owned(),
'>' => "_greater_than_sign_".to_owned(),
'?' => "_question_mark_".to_owned(),
'@' => "_at_sign_".to_owned(),
'[' => "_opening_square_bracket_".to_owned(),
'\\' => "_backslash_".to_owned(),
']' => "_closing_square_bracket_".to_owned(),
'^' => "_caret_".to_owned(),
'_' => "_underscore_".to_owned(),
'`' => "_backtick_".to_owned(),
'{' => "_opening_curly_brace_".to_owned(),
'|' => "_vertical_bar_".to_owned(),
'}' => "_closing_curly_brace_".to_owned(),
'~' => "_tilde_".to_owned(),
_ => c.to_string(),
})
.collect::<String>();
let test_name = format_ident!("_{suffix}");
@@ -142,3 +176,19 @@ pub fn generate_tests(input: proc_macro::TokenStream) -> proc_macro::TokenStream
tokens.into()
}
fn string_value(tree: &TokenTree) -> String {
match tree {
TokenTree::Literal(literal) => {
let s = literal.to_string();
if s.starts_with('"') && s.ends_with('"') {
s.trim_matches('"').to_owned()
} else if s.starts_with('\'') && s.ends_with('\'') {
s.trim_matches('\'').to_owned()
} else {
s
}
}
TokenTree::Group(_) | TokenTree::Ident(_) | TokenTree::Punct(_) => tree.to_string(),
}
}