From a5f7309ecf4bf9daca57684e9a9378d0a6c0ff1b Mon Sep 17 00:00:00 2001
From: Sebastien Routier <sroutier@gmail.com>
Date: Mon, 7 May 2018 15:47:35 -0400
Subject: [PATCH] Fix issue #430: DataGrid crashes when exporting big result
 set.

---
 src/DataGrid/DataGrid.php | 81 +++++++++++++++++++++++----------------
 src/DataSet.php           | 12 ++++--
 2 files changed, 57 insertions(+), 36 deletions(-)

diff --git a/src/DataGrid/DataGrid.php b/src/DataGrid/DataGrid.php
index 5dc249ed..71bdf130 100644
--- a/src/DataGrid/DataGrid.php
+++ b/src/DataGrid/DataGrid.php
@@ -77,18 +77,15 @@ public function build($view = '')
         return $this->output;
     }
 
-    public function buildCSV($file = '', $timestamp = '', $sanitize = true,$del = array())
+    public function buildCSV($file = '', $timestamp = '', $sanitize = true, $del = array(), $directToFile = false)
     {
-        $this->limit = null;
-        parent::build();
-
         $segments = \Request::segments();
 
         $filename = ($file != '') ? basename($file, '.csv') : end($segments);
         $filename = preg_replace('/[^0-9a-z\._-]/i', '',$filename);
         $filename .= ($timestamp != "") ? date($timestamp).".csv" : ".csv";
 
-        $save = (bool) strpos($file,"/");
+        $save = (strpos($file,"/")===false) ? false : true;
 
         //Delimiter
         $delimiter = array();
@@ -113,35 +110,17 @@ public function buildCSV($file = '', $timestamp = '', $sanitize = true,$del = ar
 
         fputs($handle, $delimiter['enclosure'].implode($delimiter['enclosure'].$delimiter['delimiter'].$delimiter['enclosure'], $this->headers) .$delimiter['enclosure'].$delimiter['line_ending']);
 
-        foreach ($this->data as $tablerow) {
-            $row = new Row($tablerow);
-
-            foreach ($this->columns as $column) {
-
-                if (in_array($column->name,array("_edit")))
-                    continue;
-
-                $cell = new Cell($column->name);
-                $value =  str_replace('"', '""',str_replace(PHP_EOL, '', strip_tags($this->getCellValue($column, $tablerow, $sanitize))));
-
-                // Excel for Mac is pretty stupid, and will break a cell containing \r, such as user input typed on a
-                // old Mac.
-                // On the other hand, PHP will not deal with the issue for use, see for instance:
-                // http://stackoverflow.com/questions/12498337/php-preg-replace-replacing-line-break
-                // We need to normalize \r and \r\n into \n, otherwise the CSV will break on Macs
-                $value = preg_replace('/\r\n|\n\r|\n|\r/', "\n", $value);
+        $this->limit = null;
+        if ($save && $directToFile) {
+            parent::build(function ($tablerow) use ($handle, $sanitize, $delimiter) {
+                $this->processTableRow($tablerow, $handle, $sanitize, $delimiter);
+            });
+        } else {
+            parent::build();
 
-                $cell->value($value);
-                $row->add($cell);
+            foreach ($this->data as $tablerow) {
+                $this->processTableRow($tablerow, $handle, $sanitize, $delimiter);
             }
-
-            if (count($this->row_callable)) {
-                foreach ($this->row_callable as $callable) {
-                    $callable($row);
-                }
-            }
-
-            fputs($handle, $delimiter['enclosure'] . implode($delimiter['enclosure'].$delimiter['delimiter'].$delimiter['enclosure'], $row->toArray()) . $delimiter['enclosure'].$delimiter['line_ending']);
         }
 
         fclose($handle);
@@ -154,6 +133,44 @@ public function buildCSV($file = '', $timestamp = '', $sanitize = true,$del = ar
         }
     }
 
+    /**
+     * @param $tablerow
+     * @param $handle
+     * @param $sanitize
+     * @param $delimiter
+     */
+    public function processTableRow($tablerow, $handle, $sanitize, $delimiter)
+    {
+        $row = new Row($tablerow);
+
+        foreach ($this->columns as $column) {
+
+            if (in_array($column->name, array("_edit")))
+                continue;
+
+            $cell = new Cell($column->name);
+            $value = str_replace('"', '""', str_replace(PHP_EOL, '', strip_tags($this->getCellValue($column, $tablerow, $sanitize))));
+
+            // Excel for Mac is pretty stupid, and will break a cell containing \r, such as user input typed on a
+            // old Mac.
+            // On the other hand, PHP will not deal with the issue for use, see for instance:
+            // http://stackoverflow.com/questions/12498337/php-preg-replace-replacing-line-break
+            // We need to normalize \r and \r\n into \n, otherwise the CSV will break on Macs
+            $value = preg_replace('/\r\n|\n\r|\n|\r/', "\n", $value);
+
+            $cell->value($value);
+            $row->add($cell);
+        }
+
+        if (count($this->row_callable)) {
+            foreach ($this->row_callable as $callable) {
+                $callable($row);
+            }
+        }
+
+        fputs($handle, $delimiter['enclosure'] . implode($delimiter['enclosure'] . $delimiter['delimiter'] . $delimiter['enclosure'], $row->toArray()) . $delimiter['enclosure'] . $delimiter['line_ending']);
+    }
+
     protected function getCellValue($column, $tablerow, $sanitize = true)
     {
         //blade
diff --git a/src/DataSet.php b/src/DataSet.php
index 55d021a2..85b98d4b 100644
--- a/src/DataSet.php
+++ b/src/DataSet.php
@@ -121,7 +121,7 @@ public function paginate($items)
         return $this;
     }
 
-    public function build()
+    public function build($rowproc = null)
     {
         if (is_string($this->source) && strpos(" ", $this->source) === false) {
             //tablename
@@ -204,10 +204,14 @@ public function build()
                         $skip++;
                         continue;
                     }
-                    //gather the rows to render.
+                    //gather the rows to render
                     else {
-                        $rows[$cnt] = $row;
-                        $cnt++;
+                        if (is_callable($rowproc)) {
+                            $rowproc($row);
+                        } else {
+                            $rows[$cnt] = $row;
+                            $cnt++;
+                        }
                     }
                     // If limit is set and we are passed it, break out of loop.
                     if (isset($limit) && ($cnt > $limit)) {