esr 0.1.0

ECMAScript-style language transpiler in Rust
Documentation 
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#[inline]
pub fn legal_in_label(byte: u8) -> bool {
    // Look up table that marks which ASCII characters are allowed in identifiers
    const NU: bool = true; // digit
    const AL: bool = true; // alphabet
    const DO: bool = true; // dollar sign $
    const US: bool = true; // underscore
    const UN: bool = true; // unicode
    const BS: bool = true; // backslash
    const __: bool = false;

    static TABLE: [bool; 256] = [
    // 0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F
      __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 0
      __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, // 1
      __, __, __, __, DO, __, __, __, __, __, __, __, __, __, __, __, // 2
      NU, NU, NU, NU, NU, NU, NU, NU, NU, NU, __, __, __, __, __, __, // 3
      __, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, // 4
      AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, __, BS, __, __, US, // 5
      __, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, // 6
      AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, AL, __, __, __, __, __, // 7
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // 8
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // 9
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // A
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // B
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // C
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // D
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // E
      UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, UN, // F
    ];

    unsafe { *(&TABLE as *const bool).offset(byte as isize) }
}