extract_byte_literal() — tailwindcss Function Reference

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

Function rust RustCore PreProcessors called by 1

Entity Profile

RustCore→ PreProcessors→ extract_byte_literal() — tailwindcss Function Reference

Dependency Diagram

graph TD
  fae00d83_31e1_2fb8_e313_50f861480787["extract_byte_literal()"]
  df7ccd48_268b_9495_004b_935c488749c1["parse_bytes_range_attr()"]
  df7ccd48_268b_9495_004b_935c488749c1 -->|calls| fae00d83_31e1_2fb8_e313_50f861480787
  style fae00d83_31e1_2fb8_e313_50f861480787 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

crates/classification-macros/src/lib.rs lines 223–253

fn extract_byte_literal(expr: &Expr) -> Result<u8> {
    if let Expr::Lit(ExprLit { lit, .. }) = expr {
        match lit {
            // Existing case: b'a'
            Lit::Byte(lb) => Ok(lb.value()),

            // New case: 0x80, 255, etc.
            Lit::Int(li) => {
                let value = li.base10_parse::<u64>()?;
                if value <= 255 {
                    Ok(value as u8)
                } else {
                    Err(syn::Error::new_spanned(
                        li,
                        format!("Integer literal {} out of range for a byte (0..255)", value),
                    ))
                }
            }

            _ => Err(syn::Error::new_spanned(
                lit,
                "Expected b'...' or an integer literal in range 0..=255",
            )),
        }
    } else {
        Err(syn::Error::new_spanned(
            expr,
            "Expected a literal expression like b'a' or 0x80",
        ))
    }
}