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require('../info/ini_get')('unicode.emantics') : undefined) || 'off'\n\n if (iniVal === 'off') {\n // assumes there are no non-BMP characters;\n // if there may be such characters, then it is best to turn it on (critical in true XHTML/XML)\n if (start < 0) {\n start += end\n }\n if (typeof len !== 'undefined') {\n if (len < 0) {\n end = len + end\n } else {\n end = len + start\n }\n }\n\n // PHP returns false if start does not fall within the string.\n // PHP returns false if the calculated end comes before the calculated start.\n // PHP returns an empty string if start and end are the same.\n // Otherwise, PHP returns the portion of the string from start to end.\n if (start >= str.length || start < 0 || start > end) {\n return false\n }\n\n return str.slice(start, end)\n }\n\n // Full-blown Unicode including non-Basic-Multilingual-Plane characters\n var i = 0\n var allBMP = true\n var es = 0\n var el = 0\n var se = 0\n var ret = ''\n\n for (i = 0; i < str.length; i++) {\n if (/[\\uD800-\\uDBFF]/.test(str.charAt(i)) && /[\\uDC00-\\uDFFF]/.test(str.charAt(i + 1))) {\n allBMP = false\n break\n }\n }\n\n if (!allBMP) {\n if (start < 0) {\n for (i = end - 1, es = (start += end); i >= es; i--) {\n if (/[\\uDC00-\\uDFFF]/.test(str.charAt(i)) && /[\\uD800-\\uDBFF]/.test(str.charAt(i - 1))) {\n start--\n es--\n }\n }\n } else {\n var surrogatePairs = /[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]/g\n while ((surrogatePairs.exec(str)) !== null) {\n var li = surrogatePairs.lastIndex\n if (li - 2 < start) {\n start++\n } else {\n break\n }\n }\n }\n\n if (start >= end || start < 0) {\n return false\n }\n if (len < 0) {\n for (i = end - 1, el = (end += len); i >= el; i--) {\n if (/[\\uDC00-\\uDFFF]/.test(str.charAt(i)) && /[\\uD800-\\uDBFF]/.test(str.charAt(i - 1))) {\n end--\n el--\n }\n }\n if (start > end) {\n return false\n }\n return str.slice(start, end)\n } else {\n se = start + len\n for (i = start; i < se; i++) {\n ret += str.charAt(i)\n if (/[\\uD800-\\uDBFF]/.test(str.charAt(i)) && /[\\uDC00-\\uDFFF]/.test(str.charAt(i + 1))) {\n // Go one further, since one of the \"characters\" is part of a surrogate pair\n se++\n }\n }\n return ret\n }\n }\n}\n"]}
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