ref: 063145fc84acfe092a75d7bd2206987c147aa2b3
dir: /lib/std/strfind.myr/
use "types" use "option" pkg std = const strfind : (haystack : byte[:], needle : byte[:] -> option(size)) const strrfind : (haystack : byte[:], needle : byte[:] -> option(size)) const strhas : (haystack : byte[:], needle : byte[:] -> bool) ;; const strfind = {haystack, needle if needle.len > haystack.len -> `std.None elif needle.len == 0 && haystack.len == 0 -> `std.Some 0 ;; for var i = 0; i <= haystack.len - needle.len; i++ for var j = 0; j < needle.len; j++ if haystack[i + j] != needle[j] goto next ;; ;; -> `std.Some i :next ;; -> `std.None } const strrfind = {haystack, needle if needle.len > haystack.len -> `std.None elif needle.len == 0 && haystack.len == 0 -> `std.Some 0 ;; for var i = haystack.len - needle.len; i >= 0; i-- for var j = 0; j < needle.len; j++ if haystack[i + j] != needle[j] goto next ;; ;; -> `std.Some i :next ;; -> `std.None } const strhas = {haystack, needle match strfind(haystack, needle) | `Some _: -> true | `None: -> false ;; }