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xmlData.replace(/(<!DOCTYPE[\\s\\w\\\"\\.\\/\\-\\:]+(\\[.*\\])*\\s*>)/g,\"\");//Remove DOCTYPE\n  const tags = [];\n  let tagFound = false;\n\n  //indicates that the root tag has been closed (aka. depth 0 has been reached)\n  let reachedRoot = false;\n\n  if (xmlData[0] === '\\ufeff') {\n    // check for byte order mark (BOM)\n    xmlData = xmlData.substr(1);\n  }\n  \n  for (let i = 0; i < xmlData.length; i++) {\n\n    if (xmlData[i] === '<' && xmlData[i+1] === '?') {\n      i+=2;\n      i = readPI(xmlData,i);\n      if (i.err) return i;\n    }else if (xmlData[i] === '<') {\n      //starting of tag\n      //read until you reach to '>' avoiding any '>' in attribute value\n      let tagStartPos = i;\n      i++;\n      \n      if (xmlData[i] === '!') {\n        i = readCommentAndCDATA(xmlData, i);\n        continue;\n      } else {\n        let closingTag = false;\n        if (xmlData[i] === '/') {\n          //closing tag\n          closingTag = true;\n          i++;\n        }\n        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readAttributeStr(xmlData, i);\n        if (result === false) {\n          return getErrorObject('InvalidAttr', \"Attributes for '\"+tagName+\"' have open quote.\", getLineNumberForPosition(xmlData, i));\n        }\n        let attrStr = result.value;\n        i = result.index;\n\n        if (attrStr[attrStr.length - 1] === '/') {\n          //self closing tag\n          const attrStrStart = i - attrStr.length;\n          attrStr = attrStr.substring(0, attrStr.length - 1);\n          const isValid = validateAttributeString(attrStr, options);\n          if (isValid === true) {\n            tagFound = true;\n            //continue; //text may presents after self closing tag\n          } else {\n            //the result from the nested function returns the position of the error within the attribute\n            //in order to get the 'true' error line, we need to calculate the position where the attribute begins (i - attrStr.length) and then add the position within the attribute\n            //this gives us the absolute index in the entire xml, which we can use to find the line at last\n            return getErrorObject(isValid.err.code, isValid.err.msg, getLineNumberForPosition(xmlData, attrStrStart + isValid.err.line));\n          }\n        } else if (closingTag) {\n          if (!result.tagClosed) {\n            return getErrorObject('InvalidTag', \"Closing tag '\"+tagName+\"' doesn't have proper closing.\", getLineNumberForPosition(xmlData, i));\n          } else if (attrStr.trim().length > 0) {\n            return getErrorObject('InvalidTag', \"Closing tag '\"+tagName+\"' can't have attributes or invalid starting.\", getLineNumberForPosition(xmlData, tagStartPos));\n          } else if (tags.length === 0) {\n            return getErrorObject('InvalidTag', \"Closing tag '\"+tagName+\"' has not been opened.\", getLineNumberForPosition(xmlData, tagStartPos));\n          } else {\n            const otg = tags.pop();\n            if (tagName !== otg.tagName) {\n              let openPos = getLineNumberForPosition(xmlData, otg.tagStartPos);\n              return getErrorObject('InvalidTag',\n                \"Expected closing tag '\"+otg.tagName+\"' (opened in line \"+openPos.line+\", col \"+openPos.col+\") instead of closing tag '\"+tagName+\"'.\",\n                getLineNumberForPosition(xmlData, tagStartPos));\n            }\n\n            //when there are no more tags, we reached the root level.\n            if (tags.length == 0) {\n              reachedRoot = true;\n            }\n          }\n        } else {\n          const isValid = validateAttributeString(attrStr, options);\n          if (isValid !== true) {\n            //the result from the nested function returns the position of the error within the attribute\n            //in order to get the 'true' error line, we need to calculate the position where the attribute begins (i - attrStr.length) and then add the position within the attribute\n            //this gives us the absolute index in the entire xml, which we can use to find the line at last\n            return getErrorObject(isValid.err.code, isValid.err.msg, getLineNumberForPosition(xmlData, i - attrStr.length + isValid.err.line));\n          }\n\n          //if the root level has been reached before ...\n          if (reachedRoot === true) {\n            return getErrorObject('InvalidXml', 'Multiple possible root nodes found.', getLineNumberForPosition(xmlData, i));\n          } else if(options.unpairedTags.indexOf(tagName) !== -1){\n            //don't push into stack\n          } else {\n            tags.push({tagName, tagStartPos});\n          }\n          tagFound = true;\n        }\n\n        //skip tag text value\n        //It may include comments and CDATA value\n        for (i++; i < xmlData.length; i++) {\n          if (xmlData[i] === '<') {\n            if (xmlData[i + 1] === '!') {\n              //comment or CADATA\n              i++;\n              i = readCommentAndCDATA(xmlData, i);\n              continue;\n            } else if (xmlData[i+1] === '?') {\n              i = readPI(xmlData, ++i);\n              if (i.err) return i;\n            } else{\n              break;\n            }\n          } else if (xmlData[i] === '&') {\n            const afterAmp = validateAmpersand(xmlData, i);\n            if (afterAmp == -1)\n              return getErrorObject('InvalidChar', \"char '&' is not expected.\", getLineNumberForPosition(xmlData, i));\n            i = afterAmp;\n          }else{\n            if (reachedRoot === true && !isWhiteSpace(xmlData[i])) {\n              return getErrorObject('InvalidXml', \"Extra text at the end\", getLineNumberForPosition(xmlData, i));\n            }\n          }\n        } //end of reading tag text value\n        if (xmlData[i] === '<') {\n          i--;\n        }\n      }\n    } else {\n      if ( isWhiteSpace(xmlData[i])) {\n        continue;\n      }\n      return getErrorObject('InvalidChar', \"char '\"+xmlData[i]+\"' is not expected.\", getLineNumberForPosition(xmlData, i));\n    }\n  }\n\n  if (!tagFound) {\n    return getErrorObject('InvalidXml', 'Start tag expected.', 1);\n  }else if (tags.length == 1) {\n      return getErrorObject('InvalidTag', \"Unclosed tag '\"+tags[0].tagName+\"'.\", getLineNumberForPosition(xmlData, tags[0].tagStartPos));\n  }else if (tags.length > 0) {\n      return getErrorObject('InvalidXml', \"Invalid '\"+\n          JSON.stringify(tags.map(t => t.tagName), null, 4).replace(/\\r?\\n/g, '')+\n          \"' found.\", {line: 1, col: 1});\n  }\n\n  return true;\n};\n\nfunction isWhiteSpace(char){\n  return char === ' ' || char === '\\t' || char === '\\n'  || char === '\\r';\n}\n/**\n * Read Processing insstructions and skip\n * @param {*} xmlData\n * @param {*} i\n */\nfunction readPI(xmlData, i) {\n  const start = i;\n  for (; i < xmlData.length; i++) {\n    if (xmlData[i] == '?' || xmlData[i] == ' ') {\n      //tagname\n      const tagname = xmlData.substr(start, i - start);\n      if (i > 5 && tagname === 'xml') {\n        return getErrorObject('InvalidXml', 'XML declaration allowed only at the start of the document.', getLineNumberForPosition(xmlData, i));\n      } else if (xmlData[i] == '?' && xmlData[i + 1] == '>') {\n        //check if valid attribut string\n        i++;\n        break;\n      } else {\n        continue;\n      }\n    }\n  }\n  return i;\n}\n\nfunction readCommentAndCDATA(xmlData, i) {\n  if (xmlData.length > i + 5 && xmlData[i + 1] === '-' && xmlData[i + 2] === '-') {\n    //comment\n    for (i += 3; i < xmlData.length; i++) {\n      if (xmlData[i] === '-' && xmlData[i + 1] === '-' && xmlData[i + 2] === '>') {\n        i += 2;\n        break;\n      }\n    }\n  } else if (\n    xmlData.length > i + 8 &&\n    xmlData[i + 1] === 'D' &&\n    xmlData[i + 2] === 'O' &&\n    xmlData[i + 3] === 'C' &&\n    xmlData[i + 4] === 'T' &&\n    xmlData[i + 5] === 'Y' &&\n    xmlData[i + 6] === 'P' &&\n    xmlData[i + 7] === 'E'\n  ) {\n    let angleBracketsCount = 1;\n    for (i += 8; i < xmlData.length; i++) {\n      if (xmlData[i] === '<') {\n        angleBracketsCount++;\n      } else if (xmlData[i] === '>') {\n        angleBracketsCount--;\n        if (angleBracketsCount === 0) {\n          break;\n        }\n      }\n    }\n  } else if (\n    xmlData.length > i + 9 &&\n    xmlData[i + 1] === '[' &&\n    xmlData[i + 2] === 'C' &&\n    xmlData[i + 3] === 'D' &&\n    xmlData[i + 4] === 'A' &&\n    xmlData[i + 5] === 'T' &&\n    xmlData[i + 6] === 'A' &&\n    xmlData[i + 7] === '['\n  ) {\n    for (i += 8; i < xmlData.length; i++) {\n      if (xmlData[i] === ']' && xmlData[i + 1] === ']' && xmlData[i + 2] === '>') {\n        i += 2;\n        break;\n      }\n    }\n  }\n\n  return i;\n}\n\nconst doubleQuote = '\"';\nconst singleQuote = \"'\";\n\n/**\n * Keep reading xmlData until '<' is found outside the attribute value.\n * @param {string} xmlData\n * @param {number} i\n */\nfunction readAttributeStr(xmlData, i) {\n  let attrStr = '';\n  let startChar = '';\n  let tagClosed = false;\n  for (; i < xmlData.length; i++) {\n    if (xmlData[i] === doubleQuote || xmlData[i] === singleQuote) {\n      if (startChar === '') {\n        startChar = xmlData[i];\n      } else if (startChar !== xmlData[i]) {\n        //if vaue is enclosed with double quote then single quotes are allowed inside the value and vice versa\n      } else {\n        startChar = '';\n      }\n    } else if (xmlData[i] === '>') {\n      if (startChar === '') {\n        tagClosed = true;\n        break;\n      }\n    }\n    attrStr += xmlData[i];\n  }\n  if (startChar !== '') {\n    return false;\n  }\n\n  return {\n    value: attrStr,\n    index: i,\n    tagClosed: tagClosed\n  };\n}\n\n/**\n * Select all the attributes whether valid or invalid.\n */\nconst validAttrStrRegxp = new RegExp('(\\\\s*)([^\\\\s=]+)(\\\\s*=)?(\\\\s*([\\'\"])(([\\\\s\\\\S])*?)\\\\5)?', 'g');\n\n//attr, =\"sd\", a=\"amit's\", a=\"sd\"b=\"saf\", ab  cd=\"\"\n\nfunction validateAttributeString(attrStr, options) {\n  //console.log(\"start:\"+attrStr+\":end\");\n\n  //if(attrStr.trim().length === 0) return true; //empty string\n\n  const matches = getAllMatches(attrStr, validAttrStrRegxp);\n  const attrNames = {};\n\n  for (let i = 0; i < matches.length; i++) {\n    if (matches[i][1].length === 0) {\n      //nospace before attribute name: a=\"sd\"b=\"saf\"\n      return getErrorObject('InvalidAttr', \"Attribute '\"+matches[i][2]+\"' has no space in starting.\", getPositionFromMatch(matches[i]))\n    } else if (matches[i][3] !== undefined && matches[i][4] === undefined) {\n      return getErrorObject('InvalidAttr', \"Attribute '\"+matches[i][2]+\"' is without value.\", getPositionFromMatch(matches[i]));\n    } else if (matches[i][3] === undefined && !options.allowBooleanAttributes) {\n      //independent attribute: ab\n      return getErrorObject('InvalidAttr', \"boolean attribute '\"+matches[i][2]+\"' is not allowed.\", getPositionFromMatch(matches[i]));\n    }\n    /* else if(matches[i][6] === undefined){//attribute without value: ab=\n                    return { err: { code:\"InvalidAttr\",msg:\"attribute \" + matches[i][2] + \" has no value assigned.\"}};\n                } */\n    const attrName = matches[i][2];\n    if (!validateAttrName(attrName)) {\n      return getErrorObject('InvalidAttr', \"Attribute '\"+attrName+\"' is an invalid name.\", getPositionFromMatch(matches[i]));\n    }\n    if (!attrNames.hasOwnProperty(attrName)) {\n      //check for duplicate attribute.\n      attrNames[attrName] = 1;\n    } else {\n      return getErrorObject('InvalidAttr', \"Attribute '\"+attrName+\"' is repeated.\", getPositionFromMatch(matches[i]));\n    }\n  }\n\n  return true;\n}\n\nfunction validateNumberAmpersand(xmlData, i) {\n  let re = /\\d/;\n  if (xmlData[i] === 'x') {\n    i++;\n    re = /[\\da-fA-F]/;\n  }\n  for (; i < xmlData.length; i++) {\n    if (xmlData[i] === ';')\n      return i;\n    if (!xmlData[i].match(re))\n      break;\n  }\n  return -1;\n}\n\nfunction validateAmpersand(xmlData, i) {\n  // https://www.w3.org/TR/xml/#dt-charref\n  i++;\n  if (xmlData[i] === ';')\n    return -1;\n  if (xmlData[i] === '#') {\n    i++;\n    return validateNumberAmpersand(xmlData, i);\n  }\n  let count = 0;\n  for (; i < xmlData.length; i++, count++) {\n    if (xmlData[i].match(/\\w/) && count < 20)\n      continue;\n    if (xmlData[i] === ';')\n      break;\n    return -1;\n  }\n  return i;\n}\n\nfunction getErrorObject(code, message, lineNumber) {\n  return {\n    err: {\n      code: code,\n      msg: message,\n      line: lineNumber.line || lineNumber,\n      col: lineNumber.col,\n    },\n  };\n}\n\nfunction validateAttrName(attrName) {\n  return isName(attrName);\n}\n\n// const startsWithXML = /^xml/i;\n\nfunction validateTagName(tagname) {\n  return isName(tagname) /* && !tagname.match(startsWithXML) */;\n}\n\n//this function returns the line number for the character at the given index\nfunction getLineNumberForPosition(xmlData, index) {\n  const lines = xmlData.substring(0, index).split(/\\r?\\n/);\n  return {\n    line: lines.length,\n\n    // column number is last line's length + 1, because column numbering starts at 1:\n    col: lines[lines.length - 1].length + 1\n  };\n}\n\n//this function returns the position of the first character of match within attrStr\nfunction getPositionFromMatch(match) {\n  return match.startIndex + match[1].length;\n}\n"],"names":["root","factory","exports","module","define","amd","this","__webpack_require__","definition","key","o","Object","defineProperty","enumerable","get","obj","prop","prototype","hasOwnProperty","call","Symbol","toStringTag","value","nameStartChar","regexName","RegExp","isName","string","exec","defaultOptions","allowBooleanAttributes","unpairedTags","validate","xmlData","options","assign","tags","tagFound","reachedRoot","substr","i","length","readPI","err","isWhiteSpace","getErrorObject","getLineNumberForPosition","tagStartPos","readCommentAndCDATA","closingTag","tagName","trim","substring","result","readAttributeStr","attrStr","index","attrStrStart","isValid","validateAttributeString","code","msg","line","tagClosed","otg","pop","openPos","col","indexOf","push","afterAmp","validateAmpersand","JSON","stringify","map","t","replace","char","start","tagname","angleBracketsCount","doubleQuote","singleQuote","startChar","validAttrStrRegxp","matches","regex","match","allmatches","startIndex","lastIndex","len","getAllMatches","attrNames","getPositionFromMatch","undefined","attrName","validateAttrName","re","validateNumberAmpersand","count","message","lineNumber","lines","split"],"sourceRoot":""}