Repository: mholt/PapaParse
Pull request #987 (2023-03-24 00:36:42)

Fix for polluted Array
We have some helper methods on our Array object.  Papaparse started blowing up with the latest update (seems to be from [this commit](https://github.com/mholt/PapaParse/commit/c1cbe16636be146f5f1d321cdd7cbddc9143b045)).

This bugfix updates the for loop to only interate over the array's elements, not the properties of the Array object.

Here's my testing sandbox, if you want to have a play: https://codesandbox.io/s/zealous-liskov-nuj41l?file=/src/index.js

I don't contribute to OSS often so this is quite new to me.  I'm happy to take any feedback on my pull.


Patch:
diff --git a/.eslintrc.js b/.eslintrc.js
index c3ed7c5..97a6726 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -1,8 +1,9 @@
 module.exports = {
 	"parserOptions": {
-		"ecmaVersion": 5
+		"ecmaVersion": 6
 	},
 	"env": {
+		"es6": true,
 		"browser": true,
 		"worker": true,
 		"node": true
diff --git a/docs/docs.html b/docs/docs.html
index cf198a5..49095b1 100644
--- a/docs/docs.html
+++ b/docs/docs.html
@@ -502,7 +502,8 @@ var csv = Papa.unparse({
 									<code>header</code>
 								</td>
 								<td>
-									If true, the first row of parsed data will be interpreted as field names. An array of field names will be returned in <a href="#meta">meta</a>, and each row of data will be an object of values keyed by field name instead of a simple array. Rows with a different number of fields from the header row will produce an error. Warning: Duplicate field names will overwrite values in previous fields having the same name.
+									If true, the first row of parsed data will be interpreted as field names. An array of field names will be returned in <a href="#meta">meta</a>, and each row of data will be an object of values keyed by field name instead of a simple array. Rows with a different number of fields from the header row will produce an error. 
+									Warning: Duplicated field names will be automatically renamed to avoid values in previous fields having the same name to be overwritten. Renamed fields with original (or transformed by <code>transformHeader</code>) are stored in <code>ParseResult.meta.renamedHeaders</code>
 								</td>
 							</tr>
 							<tr>
@@ -759,11 +760,13 @@ var csv = Papa.unparse({
 [
 	{
 		"Column 1": "foo",
-		"Column 2": "bar"
+		"Column 2": "bar",
+		"Column 1": "foo1",
 	},
 	{
 		"Column 1": "abc",
-		"Column 2": "def"
+		"Column 2": "def",
+		"Column 1": "abc1",
 	}
 ]</code></pre>
 					</div>
@@ -811,6 +814,7 @@ var csv = Papa.unparse({
 	aborted:   // Whether process was aborted
 	fields:    // Array of field names
 	truncated: // Whether preview consumed all input
+	renamedHeaders: // Headers that are automatically renamed by the library to avoid duplication. {Column 1_1: 'Column 1' // the later header 'Column 1' was renamed to 'Column 1_1'}
 }</code></pre>
 					</div>
 					<div class="grid-50">
diff --git a/package.json b/package.json
index b5b144d..54f9952 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "papaparse",
-	"version": "5.4.0",
+	"version": "5.4.1",
 	"description": "Fast and powerful CSV parser for the browser that supports web workers and streaming large files. Converts CSV to JSON and JSON to CSV.",
 	"keywords": [
 		"csv",
diff --git a/papaparse.js b/papaparse.js
index 1fd7dc4..9071e6b 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -1,6 +1,6 @@
 /* @license
 Papa Parse
-v5.4.0
+v5.4.1
 https://github.com/mholt/PapaParse
 License: MIT
 */
@@ -1413,6 +1413,8 @@ License: MIT
 		var preview = config.preview;
 		var fastMode = config.fastMode;
 		var quoteChar;
+		var renamedHeaders = null;
+
 		if (config.quoteChar === undefined || config.quoteChar === null) {
 			quoteChar = '"';
 		} else {
@@ -1472,11 +1474,12 @@ License: MIT
 				var firstLine = input.split(newline)[0];
 				var headers = firstLine.split(delim);
 				var separator = '_';
-				var headerMap = [];
+				var headerMap = new Set();
 				var headerCount = {};
 				var duplicateHeaders = false;
 
-				for (var j in headers) {
+				// Using old-style 'for' loop to avoid prototype pollution that would be picked up with 'var j in headers'
+				for (var j = 0; j < headers.length; j++) {
 					var header = headers[j];
 					if (isFunction(config.transformHeader))
 						header = config.transformHeader(header, j);
@@ -1486,17 +1489,24 @@ License: MIT
 					if (count > 0) {
 						duplicateHeaders = true;
 						headerName = header + separator + count;
+						// Initialise the variable if it hasn't been.
+						if (renamedHeaders === null) {
+							renamedHeaders = {};
+						}
 					}
 					headerCount[header] = count + 1;
-					// In case it already exists, we add more separtors
-					while (headerMap.includes(headerName)) {
+					// In case it already exists, we add more separators
+					while (headerMap.has(headerName)) {
 						headerName = headerName + separator + count;
 					}
-					headerMap.push(headerName);
+					headerMap.add(headerName);
+					if (count > 0) {
+						renamedHeaders[headerName] = header;
+					}
 				}
 				if (duplicateHeaders) {
 					var editedInput = input.split(newline);
-					editedInput[0] = headerMap.join(delim);
+					editedInput[0] = Array.from(headerMap).join(delim);
 					input = editedInput.join(newline);
 				}
 			}
@@ -1769,7 +1779,8 @@ License: MIT
 						linebreak: newline,
 						aborted: aborted,
 						truncated: !!stopped,
-						cursor: lastCursor + (baseIndex || 0)
+						cursor: lastCursor + (baseIndex || 0),
+						renamedHeaders: renamedHeaders
 					}
 				};
 			}
diff --git a/papaparse.min.js b/papaparse.min.js
index fc2ba58..eeaf983 100644
--- a/papaparse.min.js
+++ b/papaparse.min.js
@@ -1,7 +1,7 @@
 /* @license
 Papa Parse
-v5.4.0
+v5.4.1
 https://github.com/mholt/PapaParse
 License: MIT
 */
-!function(e,t){"function"==typeof define&&define.amd?define([],t):"object"==typeof module&&"undefined"!=typeof exports?module.exports=t():e.Papa=t()}(this,function s(){"use strict";var f="undefined"!=typeof self?self:"undefined"!=typeof window?window:void 0!==f?f:{};var n=!f.document&&!!f.postMessage,o=f.IS_PAPA_WORKER||!1,a={},u=0,b={parse:function(e,t){var r=(t=t||{}).dynamicTyping||!1;J(r)&&(t.dynamicTypingFunction=r,r={});if(t.dynamicTyping=r,t.transform=!!J(t.transform)&&t.transform,t.worker&&b.WORKERS_SUPPORTED){var i=function(){if(!b.WORKERS_SUPPORTED)return!1;var e=(r=f.URL||f.webkitURL||null,i=s.toString(),b.BLOB_URL||(b.BLOB_URL=r.createObjectURL(new Blob(["var global = (function() { if (typeof self !== 'undefined') { return self; } if (typeof window !== 'undefined') { return window; } if (typeof global !== 'undefined') { return global; } return {}; })(); global.IS_PAPA_WORKER=true; ","(",i,")();"],{type:"text/javascript"})))),t=new f.Worker(e);var r,i;return 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p=m.step;m.step=function(e){if(c=e,_())g();else{if(g(),0===c.data.length)return;r+=e.data.length,m.preview&&r>m.preview?o.abort():(c.data=c.data[0],p(c,t))}}}function y(e){return"greedy"===m.skipEmptyLines?""===e.join("").trim():1===e.length&&0===e[0].length}function g(){return c&&u&&(k("Delimiter","UndetectableDelimiter","Unable to auto-detect delimiting character; defaulted to '"+b.DefaultDelimiter+"'"),u=!1),m.skipEmptyLines&&(c.data=c.data.filter(function(e){return!y(e)})),_()&&function(){if(!c)return;function e(e,t){J(m.transformHeader)&&(e=m.transformHeader(e,t)),l.push(e)}if(Array.isArray(c.data[0])){for(var t=0;_()&&t<c.data.length;t++)c.data[t].forEach(e);c.data.splice(0,1)}else c.data.forEach(e)}(),function(){if(!c||!m.header&&!m.dynamicTyping&&!m.transform)return c;function e(e,t){var r,i=m.header?{}:[];for(r=0;r<e.length;r++){var n=r,s=e[r];m.header&&(n=r>=l.length?"__parsed_extra":l[r]),m.transform&&(s=m.transform(s,n)),s=v(n,s),"__parsed_extra"===n?(i[n]=i[n]||[],i[n].push(s)):i[n]=s}return m.header&&(r>l.length?k("FieldMismatch","TooManyFields","Too many fields: expected "+l.length+" fields but parsed "+r,f+t):r<l.length&&k("FieldMismatch","TooFewFields","Too few fields: expected "+l.length+" fields but parsed "+r,f+t)),i}var t=1;!c.data.length||Array.isArray(c.data[0])?(c.data=c.data.map(e),t=c.data.length):c.data=e(c.data,0);m.header&&c.meta&&(c.meta.fields=l);return f+=t,c}()}function _(){return m.header&&0===l.length}function v(e,t){return r=e,m.dynamicTypingFunction&&void 0===m.dynamicTyping[r]&&(m.dynamicTyping[r]=m.dynamicTypingFunction(r)),!0===(m.dynamicTyping[r]||m.dynamicTyping)?"true"===t||"TRUE"===t||"false"!==t&&"FALSE"!==t&&(function(e){if(s.test(e)){var t=parseFloat(e);if(n<t&&t<i)return!0}return!1}(t)?parseFloat(t):h.test(t)?new Date(t):""===t?null:t):t;var r}function k(e,t,r,i){var n={type:e,code:t,message:r};void 0!==i&&(n.row=i),c.errors.push(n)}this.parse=function(e,t,r){var i=m.quoteChar||'"';if(m.newline||(m.newline=function(e,t){e=e.substring(0,1048576);var r=new RegExp(Q(t)+"([^]*?)"+Q(t),"gm"),i=(e=e.replace(r,"")).split("\r"),n=e.split("\n"),s=1<n.length&&n[0].length<i[0].length;if(1===i.length||s)return"\n";for(var a=0,o=0;o<i.length;o++)"\n"===i[o][0]&&a++;return a>=i.length/2?"\r\n":"\r"}(e,i)),u=!1,m.delimiter)J(m.delimiter)&&(m.delimiter=m.delimiter(e),c.meta.delimiter=m.delimiter);else{var n=function(e,t,r,i,n){var s,a,o,u;n=n||[",","\t","|",";",b.RECORD_SEP,b.UNIT_SEP];for(var h=0;h<n.length;h++){var f=n[h],d=0,l=0,c=0;o=void 0;for(var p=new E({comments:i,delimiter:f,newline:t,preview:10}).parse(e),g=0;g<p.data.length;g++)if(r&&y(p.data[g]))c++;else{var _=p.data[g].length;l+=_,void 0!==o?0<_&&(d+=Math.abs(_-o),o=_):o=_}0<p.data.length&&(l/=p.data.length-c),(void 0===a||d<=a)&&(void 0===u||u<l)&&1.99<l&&(a=d,s=f,u=l)}return{successful:!!(m.delimiter=s),bestDelimiter:s}}(e,m.newline,m.skipEmptyLines,m.comments,m.delimitersToGuess);n.successful?m.delimiter=n.bestDelimiter:(u=!0,m.delimiter=b.DefaultDelimiter),c.meta.delimiter=m.delimiter}var s=w(m);return m.preview&&m.header&&s.preview++,a=e,o=new E(s),c=o.parse(a,t,r),g(),d?{meta:{paused:!0}}:c||{meta:{paused:!1}}},this.paused=function(){return d},this.pause=function(){d=!0,o.abort(),a=J(m.chunk)?"":a.substring(o.getCharIndex())},this.resume=function(){t.streamer._halted?(d=!1,t.streamer.parseChunk(a,!0)):setTimeout(t.resume,3)},this.aborted=function(){return e},this.abort=function(){e=!0,o.abort(),c.meta.aborted=!0,J(m.complete)&&m.complete(c),a=""}}function Q(e){return e.replace(/[.*+?^${}()|[\]\\]/g,"\\$&")}function E(j){var z,M=(j=j||{}).delimiter,P=j.newline,U=j.comments,q=j.step,N=j.preview,B=j.fastMode,K=z=void 0===j.quoteChar||null===j.quoteChar?'"':j.quoteChar;if(void 0!==j.escapeChar&&(K=j.escapeChar),("string"!=typeof M||-1<b.BAD_DELIMITERS.indexOf(M))&&(M=","),U===M)throw new Error("Comment character same as delimiter");!0===U?U="#":("string"!=typeof U||-1<b.BAD_DELIMITERS.indexOf(U))&&(U=!1),"\n"!==P&&"\r"!==P&&"\r\n"!==P&&(P="\n");var W=0,H=!1;this.parse=function(i,t,r){if("string"!=typeof i)throw new Error("Input must be a string");var n=i.length,e=M.length,s=P.length,a=U.length,o=J(q),u=[],h=[],f=[],d=W=0;if(!i)return L();if(j.header&&!t){var l=i.split(P)[0].split(M),c=[],p={},g=!1;for(var _ in l){var m=l[_];J(j.transformHeader)&&(m=j.transformHeader(m,_));var y=m,v=p[m]||0;for(0<v&&(g=!0,y=m+"_"+v),p[m]=v+1;c.includes(y);)y=y+"_"+v;c.push(y)}if(g){var k=i.split(P);k[0]=c.join(M),i=k.join(P)}}if(B||!1!==B&&-1===i.indexOf(z)){for(var b=i.split(P),E=0;E<b.length;E++){if(f=b[E],W+=f.length,E!==b.length-1)W+=P.length;else if(r)return L();if(!U||f.substring(0,a)!==U){if(o){if(u=[],I(f.split(M)),F(),H)return L()}else I(f.split(M));if(N&&N<=E)return u=u.slice(0,N),L(!0)}}return L()}for(var w=i.indexOf(M,W),R=i.indexOf(P,W),C=new RegExp(Q(K)+Q(z),"g"),S=i.indexOf(z,W);;)if(i[W]!==z)if(U&&0===f.length&&i.substring(W,W+a)===U){if(-1===R)return L();W=R+s,R=i.indexOf(P,W),w=i.indexOf(M,W)}else if(-1!==w&&(w<R||-1===R))f.push(i.substring(W,w)),W=w+e,w=i.indexOf(M,W);else{if(-1===R)break;if(f.push(i.substring(W,R)),D(R+s),o&&(F(),H))return L();if(N&&u.length>=N)return L(!0)}else for(S=W,W++;;){if(-1===(S=i.indexOf(z,S+1)))return r||h.push({type:"Quotes",code:"MissingQuotes",message:"Quoted field unterminated",row:u.length,index:W}),T();if(S===n-1)return T(i.substring(W,S).replace(C,z));if(z!==K||i[S+1]!==K){if(z===K||0===S||i[S-1]!==K){-1!==w&&w<S+1&&(w=i.indexOf(M,S+1)),-1!==R&&R<S+1&&(R=i.indexOf(P,S+1));var O=A(-1===R?w:Math.min(w,R));if(i.substr(S+1+O,e)===M){f.push(i.substring(W,S).replace(C,z)),i[W=S+1+O+e]!==z&&(S=i.indexOf(z,W)),w=i.indexOf(M,W),R=i.indexOf(P,W);break}var x=A(R);if(i.substring(S+1+x,S+1+x+s)===P){if(f.push(i.substring(W,S).replace(C,z)),D(S+1+x+s),w=i.indexOf(M,W),S=i.indexOf(z,W),o&&(F(),H))return L();if(N&&u.length>=N)return L(!0);break}h.push({type:"Quotes",code:"InvalidQuotes",message:"Trailing quote on quoted field is malformed",row:u.length,index:W}),S++}}else S++}return T();function I(e){u.push(e),d=W}function A(e){var t=0;if(-1!==e){var r=i.substring(S+1,e);r&&""===r.trim()&&(t=r.length)}return t}function T(e){return r||(void 0===e&&(e=i.substring(W)),f.push(e),W=n,I(f),o&&F()),L()}function D(e){W=e,I(f),f=[],R=i.indexOf(P,W)}function L(e){return{data:u,errors:h,meta:{delimiter:M,linebreak:P,aborted:H,truncated:!!e,cursor:d+(t||0)}}}function F(){q(L()),u=[],h=[]}},this.abort=function(){H=!0},this.getCharIndex=function(){return W}}function _(e){var t=e.data,r=a[t.workerId],i=!1;if(t.error)r.userError(t.error,t.file);else if(t.results&&t.results.data){var n={abort:function(){i=!0,m(t.workerId,{data:[],errors:[],meta:{aborted:!0}})},pause:y,resume:y};if(J(r.userStep)){for(var s=0;s<t.results.data.length&&(r.userStep({data:t.results.data[s],errors:t.results.errors,meta:t.results.meta},n),!i);s++);delete t.results}else J(r.userChunk)&&(r.userChunk(t.results,n,t.file),delete t.results)}t.finished&&!i&&m(t.workerId,t.results)}function m(e,t){var r=a[e];J(r.userComplete)&&r.userComplete(t),r.terminate(),delete a[e]}function y(){throw new Error("Not implemented.")}function w(e){if("object"!=typeof e||null===e)return e;var t=Array.isArray(e)?[]:{};for(var r in e)t[r]=w(e[r]);return t}function v(e,t){return function(){e.apply(t,arguments)}}function J(e){return"function"==typeof e}return o&&(f.onmessage=function(e){var t=e.data;void 0===b.WORKER_ID&&t&&(b.WORKER_ID=t.workerId);if("string"==typeof t.input)f.postMessage({workerId:b.WORKER_ID,results:b.parse(t.input,t.config),finished:!0});else if(f.File&&t.input instanceof File||t.input instanceof Object){var r=b.parse(t.input,t.config);r&&f.postMessage({workerId:b.WORKER_ID,results:r,finished:!0})}}),(l.prototype=Object.create(h.prototype)).constructor=l,(c.prototype=Object.create(h.prototype)).constructor=c,(p.prototype=Object.create(p.prototype)).constructor=p,(g.prototype=Object.create(h.prototype)).constructor=g,b});
\ No newline at end of file


Test patch:
diff --git a/tests/node-tests.js b/tests/node-tests.js
index 6d012ec..cad8058 100644
--- a/tests/node-tests.js
+++ b/tests/node-tests.js
@@ -32,6 +32,7 @@ function assertLongSampleParsedCorrectly(parsedCsv) {
 		"linebreak": "\n",
 		"aborted": false,
 		"truncated": false,
+		renamedHeaders: null,
 		"cursor": 1209
 	});
 	assert.equal(parsedCsv.errors.length, 0);
diff --git a/tests/test-cases.js b/tests/test-cases.js
index 0243a2c..1bccea6 100644
--- a/tests/test-cases.js
+++ b/tests/test-cases.js
@@ -29,7 +29,8 @@ var CORE_PARSER_TESTS = [
 		input: 'A,b,c',
 		expected: {
 			data: [['A', 'b', 'c']],
-			errors: []
+			errors: [],
+			meta: {delimiter: ',', renamedHeaders: null}
 		}
 	},
 	{
@@ -587,30 +588,33 @@ var CORE_PARSER_TESTS = [
 		}
 	},
 	{
-		description: "Simple duplicate header names",
+		description: "Simple duplicated header names",
 		input: 'A,A,A,A\n1,2,3,4',
 		config: { header: true },
 		expected: {
 			data: [['A', 'A_1', 'A_2', 'A_3'], ['1', '2', '3', '4']],
-			errors: []
+			errors: [],
+			meta: {renamedHeaders: {A_1: 'A', A_2: 'A', A_3: 'A'}}
 		}
 	},
 	{
-		description: "Duplicate header names with headerTransform",
+		description: "Duplicated header names with headerTransform",
 		input: 'A,A,A,A\n1,2,3,4',
 		config: { header: true, transformHeader: function(header) { return header.toLowerCase(); } },
 		expected: {
 			data: [['a', 'a_1', 'a_2', 'a_3'], ['1', '2', '3', '4']],
-			errors: []
+			errors: [],
+			meta: {renamedHeaders: {a_1: 'a', a_2: 'a', a_3: 'a'}}
 		}
 	},
 	{
-		description: "Duplicate header names existing column",
+		description: "Duplicated header names existing column",
 		input: 'c,c,c,c_1\n1,2,3,4',
 		config: { header: true },
 		expected: {
 			data: [['c', 'c_1', 'c_2', 'c_1_0'], ['1', '2', '3', '4']],
-			errors: []
+			errors: [],
+			meta: {renamedHeaders: {c_1: 'c', c_2: 'c'}}
 		}
 	},
 ];
@@ -621,6 +625,7 @@ describe('Core Parser Tests', function() {
 			var actual = new Papa.Parser(test.config).parse(test.input);
 			assert.deepEqual(actual.errors, test.expected.errors);
 			assert.deepEqual(actual.data, test.expected.data);
+			assert.deepNestedInclude(actual.meta, test.expected.meta || {});
 		});
 	}
 
@@ -1401,7 +1406,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 23,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1417,7 +1423,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 19,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1433,7 +1440,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 28,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1449,7 +1457,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 27,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1465,7 +1474,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 29,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1481,7 +1491,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 24,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1497,7 +1508,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 27,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},
@@ -1513,7 +1525,8 @@ var PARSE_TESTS = [
 				delimiter: ',',
 				cursor: 27,
 				aborted: false,
-				truncated: false
+				truncated: false,
+				renamedHeaders: null
 			}
 		}
 	},