nl_tokens: It s sometimes desireable to leave user requested locale instead of ICU supported one ( zh - TW is equivalent to zh - Hant - TW so we should keep shorter one if that was what user requested ) . This function returns user specified tag if its maximized form matches ICU resolved locale . If not we return ICU result .
pl_tokens: function getOptimalLanguageTag ( original , resolved ) { // Returns Array<Object>, where each object has maximized and base properties. // Maximized: zh -> zh-Hans-CN // Base: zh-CN-u-ca-gregory -> zh-CN // Take care of grandfathered or simple cases. if ( original === resolved ) { return original ; } var locales = % GetLanguageTagVariants ( [ original , resolved ] ) ; if ( locales [ 0 ] . maximized !== locales [ 1 ] . maximized ) { return resolved ; } // Preserve extensions of resolved locale, but swap base tags with original. var resolvedBase = <mask> GlobalRegExp ( '^' + locales [ 1 ] . base , 'g' ) ; return InternalRegExpReplace ( resolvedBase , resolved , locales [ 0 ] . base ) ; }