From cbe39f630d841ca120e1c95ebd0e3e27e7765a0b Mon Sep 17 00:00:00 2001
From: Eric Fossas <efossas@users.noreply.github.com>
Date: Mon, 4 Jun 2018 03:46:38 -0600
Subject: [PATCH] Add config option to transform values before dinamic typing
 (#505)

---
 papaparse.js        | 11 ++++++++---
 tests/test-cases.js | 13 +++++++++++++
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/papaparse.js b/papaparse.js
index bc73666..b289f11 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -205,6 +205,8 @@
 		}
 		_config.dynamicTyping = dynamicTyping;
 
+		_config.transform = isFunction(_config.transform) ? _config.transform : false;
+
 		if (_config.worker && Papa.WORKERS_SUPPORTED)
 		{
 			var w = newWorker();
@@ -1087,7 +1089,7 @@
 			if (needsHeaderRow())
 				fillHeaderFields();
 
-			return applyHeaderAndDynamicTyping();
+			return applyHeaderAndDynamicTypingAndTransformation();
 		}
 
 		function needsHeaderRow()
@@ -1139,9 +1141,9 @@
 			return value;
 		}
 
-		function applyHeaderAndDynamicTyping()
+		function applyHeaderAndDynamicTypingAndTransformation()
 		{
-			if (!_results || (!_config.header && !_config.dynamicTyping))
+			if (!_results || (!_config.header && !_config.dynamicTyping && !_config.transform))
 				return _results;
 
 			for (var i = 0; i < _results.data.length; i++)
@@ -1157,6 +1159,9 @@
 					if (_config.header)
 						field = j >= _fields.length ? '__parsed_extra' : _fields[j];
 
+					if (_config.transform)
+						value = _config.transform(value,field);
+
 					value = parseDynamic(field, value);
 
 					if (field === '__parsed_extra')
diff --git a/tests/test-cases.js b/tests/test-cases.js
index b10c386..7d72762 100644
--- a/tests/test-cases.js
+++ b/tests/test-cases.js
@@ -872,6 +872,19 @@ var PARSE_TESTS = [
 			errors: []
 		}
 	},
+	{
+		description: "Custom transform function is applied to values",
+		input: 'A,B,C\r\nd,e,f',
+		config: {
+			transform: function(value) {
+				return value.toLowerCase();
+			}
+		},
+		expected: {
+			data: [["a","b","c"], ["d","e","f"]],
+			errors: []
+		}
+	},
 	{
 		description: "Blank line at beginning",
 		input: '\r\na,b,c\r\nd,e,f',