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0c47091006
It's a function that prints numbers with underscores inserted for readability (e.g. "1_234_567"), used by `-Zmeta-stats` and `-Zinput-stats`. It's the only thing in `rustc_middle::util::common`, which is a bizarre location for it. This commit: - moves it to `rustc_data_structures`, a more logical crate for it; - puts it in a module `thousands`, like the similar crates.io crate; - renames it `format_with_underscores`, which is a clearer name; - rewrites it to be more concise; - slightly improves the testing.
17 lines
431 B
Rust
17 lines
431 B
Rust
//! This is an extremely bare-bones alternative to the `thousands` crate on
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//! crates.io, for printing large numbers in a readable fashion.
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#[cfg(test)]
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mod tests;
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// Converts the number to a string, with underscores as the thousands separator.
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pub fn format_with_underscores(n: usize) -> String {
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let mut s = n.to_string();
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let mut i = s.len();
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while i > 3 {
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i -= 3;
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s.insert(i, '_');
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}
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s
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}
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