fast-xml-parser - npm Package Compare versions

Comparing version 5.11.0 to 5.11.1

CHANGELOG.md

@@ -5,4 +5,5 @@ <small>Note: If you find missing information about particular minor version, that version must have been changed without any functional change in this library.</small>
 
+**5.11.1 / 2026-08-27**
+- fix: validator; Replace regex with a single-pass scanner for attribute tokens, eliminating quadratic behavior on long whitespace runs.
 
-
 **5.11.0 / 2026-08-16**
@@ -9,0 +10,0 @@ - feat: support for endIndex in node metadata (#850) [By [Pavel Dranichnikov](https://github.com/Wain-PC)]

lib/fxvalidator.min.js

@@ -1,2 +0,2 @@
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n?1==r.length?p("InvalidTag","Unclosed tag '"+r[0].tagName+"'.",F(e,r[0].tagStartPos)):!(r.length>0)||p("InvalidXml","Invalid '"+JSON.stringify(r.map(function(e){return e.tagName}),null,4).replace(/\r?\n/g,"")+"' found.",{line:1,col:1}):p("InvalidXml","Start tag expected.",1)}function o(e){return" "===e||"\t"===e||"\n"===e||"\r"===e}function u(e,t){for(var r=t;t<e.length;t++)if("?"!=e[t]&&" "!=e[t]);else{var n=e.substr(r,t-r);if(t>5&&"xml"===n)return p("InvalidXml","XML declaration allowed only at the start of the document.",F(e,t));if("?"==e[t]&&">"==e[t+1]){t++;break}}return t}function f(e,t){if(e.length>t+5&&"-"===e[t+1]&&"-"===e[t+2]){for(t+=3;t<e.length;t++)if("-"===e[t]&&"-"===e[t+1]&&">"===e[t+2]){t+=2;break}}else if(e.length>t+8&&"D"===e[t+1]&&"O"===e[t+2]&&"C"===e[t+3]&&"T"===e[t+4]&&"Y"===e[t+5]&&"P"===e[t+6]&&"E"===e[t+7]){var r=1;for(t+=8;t<e.length;t++)if("<"===e[t])r++;else if(">"===e[t]&&0===--r)break}else 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p("InvalidAttr","boolean attribute '"+r[i][2]+"' is not allowed.",I(r[i]));var a=r[i][2];if(!b(a))return p("InvalidAttr","Attribute '"+a+"' is an invalid name.",I(r[i]));if(Object.prototype.hasOwnProperty.call(n,a))return p("InvalidAttr","Attribute '"+a+"' is repeated.",I(r[i]));n[a]=1}return!0}function h(e,t){if(";"===e[++t])return-1;if("#"===e[t])return function(e,t){var r=/\d/;for("x"===e[t]&&(t++,r=/[\da-fA-F]/);t<e.length;t++){if(";"===e[t])return t;if(!e[t].match(r))break}return-1}(e,++t);for(var r=0;t<e.length;t++,r++)if(!(e[t].match(/\w/)&&r<20)){if(";"===e[t])break;return-1}return t}function p(e,t,r){return{err:{code:e,msg:t,line:r.line||r,col:r.col}}}function b(e){return i(e)}function m(e){return i(e)}function F(e,t){var r=e.substring(0,t).split(/\r?\n/);return{line:r.length,col:r[r.length-1].length+1}}function I(e){return e.startIndex+e[1].length}return t})());
+!function(e,t){"object"==typeof exports&&"object"==typeof module?module.exports=t():"function"==typeof define&&define.amd?define([],t):"object"==typeof exports?exports.XMLValidator=t():e.XMLValidator=t()}(this,()=>(()=>{"use strict";var e={d:(t,r)=>{for(var n in r)e.o(r,n)&&!e.o(t,n)&&Object.defineProperty(t,n,{enumerable:!0,get:r[n]})},o:(e,t)=>Object.prototype.hasOwnProperty.call(e,t),r:e=>{"undefined"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(e,Symbol.toStringTag,{value:"Module"}),Object.defineProperty(e,"__esModule",{value:!0})}},t={};e.r(t),e.d(t,{validate:()=>l});var r=":A-Za-z_\\u00C0-\\u00D6\\u00D8-\\u00F6\\u00F8-\\u02FF\\u0370-\\u037D\\u037F-\\u1FFF\\u200C-\\u200D\\u2070-\\u218F\\u2C00-\\u2FEF\\u3001-\\uD7FF\\uF900-\\uFDCF\\uFDF0-\\uFFFD",n=new RegExp("^["+r+"]["+r+"\\-.\\d\\u00B7\\u0300-\\u036F\\u203F-\\u2040]*$"),i=function(e){return!(null==n.exec(e))},a={allowBooleanAttributes:!1,unpairedTags:[]};function l(e,t){t=Object.assign({},a,t);var 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h("InvalidTag","Closing tag '"+p+"' can't have attributes or invalid starting.",m(e,d));if(0===r.length)return h("InvalidTag","Closing tag '"+p+"' has not been opened.",m(e,d));var A=r.pop();if(p!==A.tagName){var C=m(e,A.tagStartPos);return h("InvalidTag","Expected closing tag '"+A.tagName+"' (opened in line "+C.line+", col "+C.col+") instead of closing tag '"+p+"'.",m(e,d))}0==r.length&&(i=!0)}else{var T=v(I,t);if(!0!==T)return h(T.err.code,T.err.msg,m(e,l-I.length+T.err.line));if(!0===i)return h("InvalidXml","Multiple possible root nodes found.",m(e,l));-1!==t.unpairedTags.indexOf(p)||r.push({tagName:p,tagStartPos:d}),n=!0}for(l++;l<e.length;l++)if("<"===e[l]){if("!"===e[l+1]){l=f(e,++l);continue}if("?"!==e[l+1])break;if((l=u(e,++l)).err)return l}else if("&"===e[l]){var O=c(e,l);if(-1==O)return h("InvalidChar","char '&' is not expected.",m(e,l));l=O}else if(!0===i&&!o(e[l]))return h("InvalidXml","Extra text at the end",m(e,l));"<"===e[l]&&l--}return 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lib/fxvalidator.min.js.map

@@ -1,1 +0,1 @@
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regex.exec(string);\n  while (match) {\n    const allmatches = [];\n    allmatches.startIndex = regex.lastIndex - match[0].length;\n    const len = match.length;\n    for (let index = 0; index < len; index++) {\n      allmatches.push(match[index]);\n    }\n    matches.push(allmatches);\n    match = regex.exec(string);\n  }\n  return matches;\n}\n\nexport const isName = function (string) {\n  const match = regexName.exec(string);\n  return !(match === null || typeof match === 'undefined');\n}\n\nexport function isExist(v) {\n  return typeof v !== 'undefined';\n}\n\nexport function isEmptyObject(obj) {\n  return Object.keys(obj).length === 0;\n}\n\nexport function getValue(v) {\n  if (exports.isExist(v)) {\n    return v;\n  } else {\n    return '';\n  }\n}\n\n/**\n * Dangerous property names that could lead to prototype pollution or security issues\n */\nexport const DANGEROUS_PROPERTY_NAMES = [\n  // '__proto__',\n  // 'constructor',\n  // 'prototype',\n  'hasOwnProperty',\n  'toString',\n  'valueOf',\n  '__defineGetter__',\n  '__defineSetter__',\n  '__lookupGetter__',\n  '__lookupSetter__'\n];\n\nexport const criticalProperties = [\"__proto__\", \"constructor\", \"prototype\"];","'use strict';\n\nimport { getAllMatches, isName } from './util.js';\n\nconst defaultOptions = {\n  allowBooleanAttributes: false, //A tag can have attributes without any value\n  unpairedTags: []\n};\n\n//const tagsPattern = new RegExp(\"<\\\\/?([\\\\w:\\\\-_\\.]+)\\\\s*\\/?>\",\"g\");\nexport function validate(xmlData, options) {\n  options = Object.assign({}, defaultOptions, options);\n\n  //xmlData = xmlData.replace(/(\\r\\n|\\n|\\r)/gm,\"\");//make it single line\n  //xmlData = xmlData.replace(/(^\\s*<\\?xml.*?\\?>)/g,\"\");//Remove XML starting tag\n  //xmlData = 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        //read tagname\n        let tagName = '';\n        for (; i < xmlData.length &&\n          xmlData[i] !== '>' &&\n          xmlData[i] !== ' ' &&\n          xmlData[i] !== '\\t' &&\n          xmlData[i] !== '\\n' 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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 + 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regex.exec(string);\n  while (match) {\n    const allmatches = [];\n    allmatches.startIndex = regex.lastIndex - match[0].length;\n    const len = match.length;\n    for (let index = 0; index < len; index++) {\n      allmatches.push(match[index]);\n    }\n    matches.push(allmatches);\n    match = regex.exec(string);\n  }\n  return matches;\n}\n\nexport const isName = function (string) {\n  const match = regexName.exec(string);\n  return !(match === null || typeof match === 'undefined');\n}\n\nexport function isExist(v) {\n  return typeof v !== 'undefined';\n}\n\nexport function isEmptyObject(obj) {\n  return Object.keys(obj).length === 0;\n}\n\nexport function getValue(v) {\n  if (exports.isExist(v)) {\n    return v;\n  } else {\n    return '';\n  }\n}\n\n/**\n * Dangerous property names that could lead to prototype pollution or security issues\n */\nexport const DANGEROUS_PROPERTY_NAMES = [\n  // '__proto__',\n  // 'constructor',\n  // 'prototype',\n  'hasOwnProperty',\n  'toString',\n  'valueOf',\n  '__defineGetter__',\n  '__defineSetter__',\n  '__lookupGetter__',\n  '__lookupSetter__'\n];\n\nexport const criticalProperties = [\"__proto__\", \"constructor\", \"prototype\"];","'use strict';\n\nimport { isName } from './util.js';\n\nconst defaultOptions = {\n  allowBooleanAttributes: false, //A tag can have attributes without any value\n  unpairedTags: []\n};\n\n//const tagsPattern = new RegExp(\"<\\\\/?([\\\\w:\\\\-_\\.]+)\\\\s*\\/?>\",\"g\");\nexport function validate(xmlData, options) {\n  options = Object.assign({}, defaultOptions, options);\n\n  //xmlData = xmlData.replace(/(\\r\\n|\\n|\\r)/gm,\"\");//make it single line\n  //xmlData = xmlData.replace(/(^\\s*<\\?xml.*?\\?>)/g,\"\");//Remove XML starting tag\n  //xmlData = 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        //read tagname\n        let tagName = '';\n        for (; i < xmlData.length &&\n          xmlData[i] !== '>' &&\n          xmlData[i] !== ' ' &&\n          xmlData[i] !== '\\t' &&\n          xmlData[i] !== '\\n' &&\n          xmlData[i] !== '\\r'; i++\n        ) {\n          tagName += xmlData[i];\n        }\n        tagName = tagName.trim();\n        //console.log(tagName);\n\n        if (tagName[tagName.length - 1] === '/') {\n          //self closing tag without attributes\n          tagName = tagName.substring(0, tagName.length - 1);\n          //continue;\n          i--;\n        }\n        if (!validateTagName(tagName)) {\n          let msg;\n          if (tagName.trim().length === 0) {\n            msg = \"Invalid space after '<'.\";\n          } else {\n            msg = \"Tag '\" + tagName + \"' is an invalid name.\";\n          }\n          return getErrorObject('InvalidTag', msg, getLineNumberForPosition(xmlData, i));\n        }\n\n        const result = 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 * Walk `attrStr` once, left to right, splitting it into attribute tokens.\n *\n * This replaces a regex that used to do the same job\n * (`(\\s*)([^\\s=]+)(\\s*=)?(\\s*(['\"])(([\\s\\S])*?)\\5)?`). That regex led with an\n * optional whitespace group followed by a required \"non-whitespace\" group.\n * On a long run of whitespace that never resolves into an attribute name\n * (e.g. a tag with thousands of trailing spaces before `>`), the engine\n * backtracks the whitespace group one character at a time before giving up\n * and moving to the next starting position — one full backtrack per\n * position, which is quadratic in the length of the run.\n *\n * A single forward-only scan can never backtrack, so it can't be made slow\n * this way no matter how much whitespace the input contains — it's always\n * proportional to the length of the string, once.\n *\n * Each returned token mirrors the shape the old regex match array had, so\n * the validation logic below (which reads token[1]..token[6]) didn't need\n * to change:\n *   token.startIndex - where this token begins in attrStr\n *   token[1]          - leading whitespace before the name\n *   token[2]          - the attribute name\n *   token[3]          - whitespace + '=' if present, else undefined\n *   token[4]          - marker (any defined value) if a quoted value was found\n *   token[5]          - the quote character used ('\"' or \"'\")\n *   token[6]          - the value's text, without the surrounding quotes\n *\n * A malformed leading character (e.g. a stray '=' with no name before it)\n * is simply skipped over, one character at a time — the same outcome the\n * old regex produced by failing to match at that position and retrying at\n * the next one.\n */\nfunction scanAttributeTokens(attrStr) {\n  const tokens = [];\n  const len = attrStr.length;\n  let i = 0;\n\n  while (i < len) {\n    const tokenStart = i;\n\n    // Leading whitespace before the name.\n    while (i < len && isWhiteSpace(attrStr[i])) i++;\n    if (i >= len) break; // trailing whitespace only — nothing left to read\n\n    if (attrStr[i] === '=') {\n      // No name before this '=' — not a valid attribute start. Move past\n      // just this one character and try again from the next position.\n      i = tokenStart + 1;\n      continue;\n    }\n\n    const leadingWs = attrStr.slice(tokenStart, i);\n\n    // Attribute name — everything up to the next whitespace or '='.\n    const nameStart = i;\n    while (i < len && !isWhiteSpace(attrStr[i]) && attrStr[i] !== '=') i++;\n    const name = attrStr.slice(nameStart, i);\n\n    // Optional whitespace + '='.\n    let equalsGroup; // whitespace + '=' text, or undefined if absent\n    let j = i;\n    while (j < len && isWhiteSpace(attrStr[j])) j++;\n    if (j < len && attrStr[j] === '=') {\n      equalsGroup = attrStr.slice(i, j + 1);\n      i = j + 1;\n    }\n\n    // Optional whitespace + quoted value.\n    let quoteChar;\n    let value;\n    let k = i;\n    while (k < len && isWhiteSpace(attrStr[k])) k++;\n    if (k < len && (attrStr[k] === '\"' || attrStr[k] === \"'\")) {\n      const valueStart = k + 1;\n      const closeIdx = attrStr.indexOf(attrStr[k], valueStart);\n      if (closeIdx !== -1) {\n        quoteChar = attrStr[k];\n        value = attrStr.slice(valueStart, closeIdx);\n        i = closeIdx + 1;\n      }\n      // No closing quote found anywhere in the rest of the string — leave\n      // quoteChar/value undefined, same as the old regex's group failing\n      // to match a backreference-less run.\n    }\n\n    const token = { startIndex: tokenStart };\n    token[1] = leadingWs;\n    token[2] = name;\n    token[3] = equalsGroup;\n    token[4] = quoteChar !== undefined ? true : undefined;\n    token[5] = quoteChar;\n    token[6] = value;\n    tokens.push(token);\n  }\n\n  return tokens;\n}\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 = scanAttributeTokens(attrStr);\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 (!Object.prototype.hasOwnProperty.call(attrNames, 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}"],"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","validateTagName","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","matches","tokens","len","tokenStart","leadingWs","slice","nameStart","name","equalsGroup","j","quoteChar","k","valueStart","closeIdx","token","startIndex","undefined","scanAttributeTokens","attrNames","getPositionFromMatch","attrName","validateAttrName","re","match","validateNumberAmpersand","count","message","lineNumber","lines","split"],"sourceRoot":""}

package.json

 {
   "name": "fast-xml-parser",
-  "version": "5.11.0",
+  "version": "5.11.1",
   "description": "Validate XML, Parse XML, Build XML without C/C++ based libraries",
@@ -5,0 +5,0 @@ "main": "./lib/fxp.cjs",

src/validator.js

 'use strict';
 
-import { getAllMatches, isName } from './util.js';
+import { isName } from './util.js';
 
@@ -313,6 +313,99 @@ const defaultOptions = {
 /**
- * Select all the attributes whether valid or invalid.
+ * Walk `attrStr` once, left to right, splitting it into attribute tokens.
+ *
+ * This replaces a regex that used to do the same job
+ * (`(\s*)([^\s=]+)(\s*=)?(\s*(['"])(([\s\S])*?)\5)?`). That regex led with an
+ * optional whitespace group followed by a required "non-whitespace" group.
+ * On a long run of whitespace that never resolves into an attribute name
+ * (e.g. a tag with thousands of trailing spaces before `>`), the engine
+ * backtracks the whitespace group one character at a time before giving up
+ * and moving to the next starting position — one full backtrack per
+ * position, which is quadratic in the length of the run.
+ *
+ * A single forward-only scan can never backtrack, so it can't be made slow
+ * this way no matter how much whitespace the input contains — it's always
+ * proportional to the length of the string, once.
+ *
+ * Each returned token mirrors the shape the old regex match array had, so
+ * the validation logic below (which reads token[1]..token[6]) didn't need
+ * to change:
+ *   token.startIndex - where this token begins in attrStr
+ *   token[1]          - leading whitespace before the name
+ *   token[2]          - the attribute name
+ *   token[3]          - whitespace + '=' if present, else undefined
+ *   token[4]          - marker (any defined value) if a quoted value was found
+ *   token[5]          - the quote character used ('"' or "'")
+ *   token[6]          - the value's text, without the surrounding quotes
+ *
+ * A malformed leading character (e.g. a stray '=' with no name before it)
+ * is simply skipped over, one character at a time — the same outcome the
+ * old regex produced by failing to match at that position and retrying at
+ * the next one.
  */
-const validAttrStrRegxp = new RegExp('(\\s*)([^\\s=]+)(\\s*=)?(\\s*([\'"])(([\\s\\S])*?)\\5)?', 'g');
+function scanAttributeTokens(attrStr) {
+  const tokens = [];
+  const len = attrStr.length;
+  let i = 0;
 
+  while (i < len) {
+    const tokenStart = i;
+
+    // Leading whitespace before the name.
+    while (i < len && isWhiteSpace(attrStr[i])) i++;
+    if (i >= len) break; // trailing whitespace only — nothing left to read
+
+    if (attrStr[i] === '=') {
+      // No name before this '=' — not a valid attribute start. Move past
+      // just this one character and try again from the next position.
+      i = tokenStart + 1;
+      continue;
+    }
+
+    const leadingWs = attrStr.slice(tokenStart, i);
+
+    // Attribute name — everything up to the next whitespace or '='.
+    const nameStart = i;
+    while (i < len && !isWhiteSpace(attrStr[i]) && attrStr[i] !== '=') i++;
+    const name = attrStr.slice(nameStart, i);
+
+    // Optional whitespace + '='.
+    let equalsGroup; // whitespace + '=' text, or undefined if absent
+    let j = i;
+    while (j < len && isWhiteSpace(attrStr[j])) j++;
+    if (j < len && attrStr[j] === '=') {
+      equalsGroup = attrStr.slice(i, j + 1);
+      i = j + 1;
+    }
+
+    // Optional whitespace + quoted value.
+    let quoteChar;
+    let value;
+    let k = i;
+    while (k < len && isWhiteSpace(attrStr[k])) k++;
+    if (k < len && (attrStr[k] === '"' || attrStr[k] === "'")) {
+      const valueStart = k + 1;
+      const closeIdx = attrStr.indexOf(attrStr[k], valueStart);
+      if (closeIdx !== -1) {
+        quoteChar = attrStr[k];
+        value = attrStr.slice(valueStart, closeIdx);
+        i = closeIdx + 1;
+      }
+      // No closing quote found anywhere in the rest of the string — leave
+      // quoteChar/value undefined, same as the old regex's group failing
+      // to match a backreference-less run.
+    }
+
+    const token = { startIndex: tokenStart };
+    token[1] = leadingWs;
+    token[2] = name;
+    token[3] = equalsGroup;
+    token[4] = quoteChar !== undefined ? true : undefined;
+    token[5] = quoteChar;
+    token[6] = value;
+    tokens.push(token);
+  }
+
+  return tokens;
+}
+
 //attr, ="sd", a="amit's", a="sd"b="saf", ab  cd=""
@@ -325,3 +418,3 @@
 
-  const matches = getAllMatches(attrStr, validAttrStrRegxp);
+  const matches = scanAttributeTokens(attrStr);
   const attrNames = {};
@@ -427,2 +520,2 @@
   return match.startIndex + match[1].length;
-}
+}

No alert changes

Improved metrics

Total package byte prevSize

1313670

1.49%

Lines of code

5178

1.71%

No dependency changes