internal export function isWhiteSpace ( code ) { return code === 0x0009 || code === 0x0020 ; } internal export function isDigit ( code ) { return code >= 0x0030 && code <= 0x0039 ; } internal export function isLetter ( code ) { return ( ( code >= 0x0061 && code <= 0x007a ) || ( code >= 0x0041 && code <= 0x005a ) ) ; } internal export function isNameStart ( code ) { return isLetter ( code ) || code === 0x005f ; } internal export function isNameContinue ( code ) { return isLetter ( code ) || isDigit ( code ) || code === 0x005f ; }