Add Formula struct, fix other model types (#61)

CoreXLSX.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		D12211DC227B555600888BCB /* Formula.swift in Sources */ = {isa = PBXBuildFile; fileRef = D12211DB227B555600888BCB /* Formula.swift */; };
 		D15021C521A1C31800BFA4FC /* ZIPFoundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D15021C321A1C31800BFA4FC /* ZIPFoundation.framework */; };
 		D15021C621A1C31800BFA4FC /* XMLCoder.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D15021C421A1C31800BFA4FC /* XMLCoder.framework */; };
 		D15021C721A1C33E00BFA4FC /* ZIPFoundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = D15021C321A1C31800BFA4FC /* ZIPFoundation.framework */; };
@@ -101,6 +102,7 @@
 /* Begin PBXFileReference section */
 		"CoreXLSX::CoreXLSX::Product" /* CoreXLSX.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; path = CoreXLSX.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		"CoreXLSX::CoreXLSXTests::Product" /* CoreXLSXTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; path = CoreXLSXTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
+		D12211DB227B555600888BCB /* Formula.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Formula.swift; sourceTree = "<group>"; };
 		D15021C321A1C31800BFA4FC /* ZIPFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ZIPFoundation.framework; path = Carthage/Build/Mac/ZIPFoundation.framework; sourceTree = "<group>"; };
 		D15021C421A1C31800BFA4FC /* XMLCoder.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = XMLCoder.framework; path = Carthage/Build/Mac/XMLCoder.framework; sourceTree = "<group>"; };
 		D15021D121A1CA7D00BFA4FC /* CoreXLSX.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = CoreXLSX.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -306,6 +308,7 @@
 				D1A8190821A9CB89004FCA33 /* Worksheet.swift */,
 				D1EB1B3321B151440043CD1E /* SharedStrings.swift */,
 				D1BBD9D3223D3D5C00B28C7B /* Styles.swift */,
+				D12211DB227B555600888BCB /* Formula.swift */,
 			);
 			name = CoreXLSXTests;
 			path = Tests/CoreXLSXTests;
@@ -724,6 +727,7 @@
 				D1A8190921A9CB89004FCA33 /* Worksheet.swift in Sources */,
 				OBJ_91 /* CoreXLSX.swift in Sources */,
 				OBJ_92 /* Relationships.swift in Sources */,
+				D12211DC227B555600888BCB /* Formula.swift in Sources */,
 				OBJ_93 /* XCTestManifests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

Sources/CoreXLSX/Relationships.swift

@@ -50,6 +50,11 @@ public struct Relationship: Codable, Equatable {
       http://schemas.openxmlformats.org/officeDocument/2006/relationships/\
       worksheet
       """
+    case chartsheet =
+      """
+      http://schemas.openxmlformats.org/officeDocument/2006/relationships/\
+      chartsheet
+      """
     case sharedStrings =
       """
       http://schemas.openxmlformats.org/officeDocument/2006/relationships/\

Sources/CoreXLSX/SharedStrings.swift

@@ -69,7 +69,7 @@ public struct RichText: Codable, Equatable {
 
   public struct Properties: Codable, Equatable {
     public let size: Size
-    public let color: Color
+    public let color: Color?
     public let font: Font
     public let family: Family?
     public let scheme: Scheme?
@@ -83,7 +83,7 @@ public struct RichText: Codable, Equatable {
     }
   }
 
-  public let properties: Properties
+  public let properties: Properties?
 
   enum CodingKeys: String, CodingKey {
     case properties = "rPr"

Sources/CoreXLSX/Worksheet/Cell.swift

@@ -5,6 +5,8 @@
 //  Created by Max Desiatov on 24/11/2018.
 //
 
+// swiftlint:disable:next line_length
+/// [docs](https://wiki.ucl.ac.uk/display/~ucftpw2/2013/10/22/Using+git+for+version+control+of+Excel+spreadsheets+-+part+2+of+3)
 public struct Cell: Codable, Equatable {
   public let reference: CellReference
   public let type: String?
@@ -15,9 +17,19 @@ public struct Cell: Codable, Equatable {
   // element having the same name?
   public let s: String?
   public let inlineString: InlineString?
-  public let formula: String?
+  public let formula: Formula?
   public let value: String?
 
+  public struct Formula: Codable, Equatable {
+    public let calculationIndex: Int?
+    public let value: String?
+
+    enum CodingKeys: String, CodingKey {
+      case calculationIndex = "ca"
+      case value
+    }
+  }
+
   enum CodingKeys: String, CodingKey {
     case formula = "f"
     case value = "v"

Sources/CoreXLSX/Worksheet/Worksheet.swift

@@ -237,7 +237,7 @@ public struct MergeCell: Codable {
 }
 
 public struct InlineString: Codable, Equatable {
-  let text: String?
+  public let text: String?
 
   enum CodingKeys: String, CodingKey {
     case text = "t"

Tests/CoreXLSXTests/Formula.swift

@@ -0,0 +1,47 @@
+//
+//  Formula.swift
+//  CoreXLSXTests
+//
+//  Created by Max Desiatov on 02/05/2019.
+//
+
+@testable import CoreXLSX
+import XCTest
+import XMLCoder
+
+private let formulaXML = """
+<row r="11" spans="1:99" ht="13.15" customHeight="1">
+  <c r="A11" s="42"/>
+  <c r="B11" s="42"/>
+  <c r="C11" s="42" t="s">
+    <v>42</v>
+  </c>
+  <c r="D11" s="42"/>
+  <c r="E11" s="42"/>
+  <c r="F11" s="42">
+    <f ca="1">NOW()</f>
+    <v>42.42</v>
+  </c>
+  <c r="G11" s="363" t="s">
+    <v>42</v>
+  </c>
+  <c r="H11" s="365"/>
+  <c r="I11" s="96">
+    <f ca="1">NOW()</f>
+    <v>42.42</v>
+  </c>
+</row>
+""".data(using: .utf8)!
+
+final class FormulaTests: XCTestCase {
+  private let decoder = XMLDecoder()
+
+  func testFormulas() throws {
+    decoder.shouldProcessNamespaces = true
+
+    let row = try decoder.decode(Row.self, from: formulaXML)
+    XCTAssertEqual(row.cells.count, 9)
+    XCTAssertEqual(row.cells[5].formula?.value, "NOW()")
+    XCTAssertEqual(row.cells[8].formula?.value, "NOW()")
+  }
+}

Tests/CoreXLSXTests/Namespaces.swift

@@ -9,7 +9,7 @@
 import XCTest
 import XMLCoder
 
-let namespaceXML = """
+private let namespaceXML = """
 <?xml version="1.0" encoding="utf-8"?>
 <x:worksheet \
 xmlns:x="http://schemas.openxmlformats.org/spreadsheetml/2006/main">