fast_skip() — tailwindcss Function Reference

Architecture documentation for the fast_skip() function in fast_skip.rs from the tailwindcss codebase.

Function rust OxideEngine Scanner calls 3

Entity Profile

OxideEngine→ Scanner→ fast_skip() — tailwindcss Function Reference

Dependency Diagram

graph TD
  54ff163f_d7d8_33b7_ab03_357396dc721e["fast_skip()"]
  da8a4fe3_f449_f96e_2529_4eb000066b15["fast_skip.rs"]
  54ff163f_d7d8_33b7_ab03_357396dc721e -->|defined in| da8a4fe3_f449_f96e_2529_4eb000066b15
  3ecd1485_01ac_d379_ce41_13dc687d772e["is_ascii_whitespace()"]
  54ff163f_d7d8_33b7_ab03_357396dc721e -->|calls| 3ecd1485_01ac_d379_ce41_13dc687d772e
  122f0460_a295_4925_ce2b_84876fb90029["load()"]
  54ff163f_d7d8_33b7_ab03_357396dc721e -->|calls| 122f0460_a295_4925_ce2b_84876fb90029
  9460a391_c5ae_0526_2669_1e2c1e10a1c3["all_true()"]
  54ff163f_d7d8_33b7_ab03_357396dc721e -->|calls| 9460a391_c5ae_0526_2669_1e2c1e10a1c3
  style 54ff163f_d7d8_33b7_ab03_357396dc721e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

crates/oxide/src/fast_skip.rs lines 7–38

pub fn fast_skip(cursor: &Cursor) -> Option<usize> {
    // If we don't have enough bytes left to check then bail early
    if cursor.pos + STRIDE >= cursor.input.len() {
        return None;
    }

    if !cursor.curr.is_ascii_whitespace() {
        return None;
    }

    let mut offset = 1;

    // SAFETY: We've already checked (indirectly) that this index is valid
    let remaining = unsafe { cursor.input.get_unchecked(cursor.pos..) };

    // NOTE: This loop uses primitives designed to be auto-vectorized
    // Do not change this loop without benchmarking the results
    // And checking the generated assembly using godbolt.org
    for (i, chunk) in remaining.chunks_exact(STRIDE).enumerate() {
        let value = load(chunk);
        let is_whitespace = is_ascii_whitespace(value);
        let is_all_whitespace = all_true(is_whitespace);

        if is_all_whitespace {
            offset = (i + 1) * STRIDE;
        } else {
            break;
        }
    }

    Some(cursor.pos + offset)
}