Spreadsheet: Add the 'Date' cell type

Since `JS::Date::value_of()' returns the timestamp in ms, this new type
assumes that the value given is also in ms.

Applications/Spreadsheet/CMakeLists.txt

@@ -4,6 +4,7 @@ compile_json_gui(CondView.json CondFormattingViewUI.h cond_fmt_view_ui_json)
 set(SOURCES
     Cell.cpp
     CellSyntaxHighlighter.cpp
+    CellType/Date.cpp
     CellType/Format.cpp
     CellType/Identity.cpp
     CellType/Numeric.cpp

Applications/Spreadsheet/CellType/Date.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "Date.h"
+#include "../Cell.h"
+#include "../Spreadsheet.h"
+#include <LibCore/DateTime.h>
+
+namespace Spreadsheet {
+
+DateCell::DateCell()
+    : CellType("Date")
+{
+}
+
+DateCell::~DateCell()
+{
+}
+
+String DateCell::display(Cell& cell, const CellTypeMetadata& metadata) const
+{
+    auto timestamp = js_value(cell, metadata);
+    auto string = Core::DateTime::from_timestamp(timestamp.to_i32(cell.sheet->interpreter())).to_string(metadata.format.is_empty() ? "%Y-%m-%d %H:%M:%S" : metadata.format.characters());
+
+    if (metadata.length >= 0)
+        return string.substring(0, metadata.length);
+
+    return string;
+}
+
+JS::Value DateCell::js_value(Cell& cell, const CellTypeMetadata&) const
+{
+    auto value = cell.js_data().to_double(cell.sheet->interpreter());
+    return JS::Value(value / 1000); // Turn it to seconds
+}
+
+}

Applications/Spreadsheet/CellType/Date.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "Type.h"
+
+namespace Spreadsheet {
+
+class DateCell : public CellType {
+
+public:
+    DateCell();
+    virtual ~DateCell() override;
+    virtual String display(Cell&, const CellTypeMetadata&) const override;
+    virtual JS::Value js_value(Cell&, const CellTypeMetadata&) const override;
+};
+
+}

Applications/Spreadsheet/CellType/Type.cpp

@@ -25,6 +25,7 @@
  */
 
 #include "Type.h"
+#include "Date.h"
 #include "Identity.h"
 #include "Numeric.h"
 #include "String.h"
@@ -35,6 +36,7 @@ static HashMap<String, Spreadsheet::CellType*> s_cell_types;
 static Spreadsheet::StringCell s_string_cell;
 static Spreadsheet::NumericCell s_numeric_cell;
 static Spreadsheet::IdentityCell s_identity_cell;
+static Spreadsheet::DateCell s_date_cell;
 
 namespace Spreadsheet {