From c0b60fcb7695b51f257a8d691ada7035f96e81de Mon Sep 17 00:00:00 2001
From: MarkBaker <mark@demon-angel.eu>
Date: Mon, 20 Feb 2023 12:18:16 +0100
Subject: [PATCH] Issue 3381 - Fix decimal precision for Scientific Number
 Format Mask

---
 CHANGELOG.md                                      |  2 +-
 .../Style/NumberFormat/NumberFormatter.php        |  5 ++++-
 tests/data/Style/NumberFormat.php                 | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2a0fa31f1..aedc79c93 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -35,7 +35,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 - XLSX Writer - Array Formulas do not include function prefix [Issue #3337](https://github.com/PHPOffice/PhpSpreadsheet/issues/3337) [PR #3338](https://github.com/PHPOffice/PhpSpreadsheet/pull/3338)
 - Permit Max Column for Row Breaks [Issue #3143](https://github.com/PHPOffice/PhpSpreadsheet/issues/3143) [PR #3345](https://github.com/PHPOffice/PhpSpreadsheet/pull/3345)
 - AutoSize Columns should allow for dropdown icon when AutoFilter is for a Table [Issue #3356](https://github.com/PHPOffice/PhpSpreadsheet/issues/3356) [PR #3358](https://github.com/PHPOffice/PhpSpreadsheet/pull/3358)
-
+- Decimal Precision for Scientific Number Format Mask [Issue #3381](https://github.com/PHPOffice/PhpSpreadsheet/issues/3381) [PR #3382](https://github.com/PHPOffice/PhpSpreadsheet/pull/3382)
 
 ## 1.27.1 - 2023-02-08
 
diff --git a/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php b/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
index f089ebacf..d55c60991 100644
--- a/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
+++ b/src/PhpSpreadsheet/Style/NumberFormat/NumberFormatter.php
@@ -164,7 +164,10 @@ class NumberFormatter
 
         if (preg_match('/[0#]E[+-]0/i', $format)) {
             //    Scientific format
-            return sprintf('%5.2E', $valueFloat);
+            $decimals = strlen($right);
+            $size = $decimals + 3;
+
+            return sprintf("%{$size}.{$decimals}E", $valueFloat);
         } elseif (preg_match('/0([^\d\.]+)0/', $format) || substr_count($format, '.') > 1) {
             if ($valueFloat == floor($valueFloat) && substr_count($format, '.') === 1) {
                 $value *= 10 ** strlen(explode('.', $format)[1]);
diff --git a/tests/data/Style/NumberFormat.php b/tests/data/Style/NumberFormat.php
index da6d2778f..eb981a751 100644
--- a/tests/data/Style/NumberFormat.php
+++ b/tests/data/Style/NumberFormat.php
@@ -1479,4 +1479,19 @@ return [
         '1111.119',
         '[$€-en_US]_(#,##0.00_);[$€-en_US] (#,##0.00)',
     ],
+    [
+        '-1.2E+4',
+        -12345.6789,
+        '0.0E+00',
+    ],
+    [
+        '-1.23E+4',
+        -12345.6789,
+        '0.00E+00',
+    ],
+    [
+        '-1.235E+4',
+        -12345.6789,
+        '0.000E+00',
+    ],
 ];