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function(t,e,r){"use strict";var n=r(797686),i=/[\uD800-\uDFFF]/;function o(t){return 55296<=t&&t<=57343}function a(t){return i.test(t)}function s(t,e){return 1+o(t.charCodeAt(e))}function u(t,e,r){if(e=e||0,r=void 0===r?1/0:r||0,!a(t))return t.substr(e,r);var n=t.length;if(n<=0||e>n||r<=0)return"";var i=0;if(e>0){for(;e>0&&i<n;e--)i+=s(t,i);if(i>=n)return""}else if(e<0){for(i=n;e<0&&0<i;e++)i-=s(t,i-1);i<0&&(i=0)}var o=n;if(r<n)for(o=i;r>0&&o<n;r--)o+=s(t,o);return t.substring(i,o)}t.exports={getCodePoints:function(t){for(var e=[],r=0;r<t.length;r+=s(t,r))e.push(t.codePointAt(r));return e},getUTF16Length:s,hasSurrogateUnit:a,isCodeUnitInSurrogateRange:o,isSurrogatePair:function(t,e){if(0<=e&&e<t.length||n(!1),e+1===t.length)return!1;var r=t.charCodeAt(e),i=t.charCodeAt(e+1);return 55296<=r&&r<=56319&&56320<=i&&i<=57343},strlen:function(t){if(!a(t))return t.length;for(var e=0,r=0;r<t.length;r+=s(t,r))e++;return e},substring:function(t,e,r){(e=e||0)<0&&(e=0),(r=void 0===r?1/0:r||0)<0&&(r=0);var n=Math.abs(r-e);return u(t,e=e<r?e:r,n)},substr:u}}