Final commit - Chetan Khanna - challenge submission

ios/Flutter/AppFrameworkInfo.plist

@@ -21,6 +21,6 @@
   <key>CFBundleVersion</key>
   <string>1.0</string>
   <key>MinimumOSVersion</key>
-  <string>8.0</string>
+  <string>9.0</string>
 </dict>
 </plist>

ios/Flutter/Debug.xcconfig

@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"
 #include "Generated.xcconfig"

ios/Flutter/Release.xcconfig

@@ -1 +1,2 @@
+#include? "Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"
 #include "Generated.xcconfig"

ios/Podfile

@@ -0,0 +1,41 @@
+# Uncomment this line to define a global platform for your project
+# platform :ios, '9.0'
+
+# CocoaPods analytics sends network stats synchronously affecting flutter build latency.
+ENV['COCOAPODS_DISABLE_STATS'] = 'true'
+
+project 'Runner', {
+  'Debug' => :debug,
+  'Profile' => :release,
+  'Release' => :release,
+}
+
+def flutter_root
+  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
+  unless File.exist?(generated_xcode_build_settings_path)
+    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
+  end
+
+  File.foreach(generated_xcode_build_settings_path) do |line|
+    matches = line.match(/FLUTTER_ROOT\=(.*)/)
+    return matches[1].strip if matches
+  end
+  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}. Try deleting Generated.xcconfig, then run flutter pub get"
+end
+
+require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)
+
+flutter_ios_podfile_setup
+
+target 'Runner' do
+  use_frameworks!
+  use_modular_headers!
+
+  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
+end
+
+post_install do |installer|
+  installer.pods_project.targets.each do |target|
+    flutter_additional_ios_build_settings(target)
+  end
+end

ios/Podfile.lock

@@ -0,0 +1,22 @@
+PODS:
+  - Flutter (1.0.0)
+  - path_provider_ios (0.0.1):
+    - Flutter
+
+DEPENDENCIES:
+  - Flutter (from `Flutter`)
+  - path_provider_ios (from `.symlinks/plugins/path_provider_ios/ios`)
+
+EXTERNAL SOURCES:
+  Flutter:
+    :path: Flutter
+  path_provider_ios:
+    :path: ".symlinks/plugins/path_provider_ios/ios"
+
+SPEC CHECKSUMS:
+  Flutter: 50d75fe2f02b26cc09d224853bb45737f8b3214a
+  path_provider_ios: 7d7ce634493af4477d156294792024ec3485acd5
+
+PODFILE CHECKSUM: aafe91acc616949ddb318b77800a7f51bffa2a4c
+
+COCOAPODS: 1.11.2

ios/Runner.xcodeproj/project.pbxproj

@@ -13,6 +13,7 @@
 		97C146FC1CF9000F007C117D /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FA1CF9000F007C117D /* Main.storyboard */; };
 		97C146FE1CF9000F007C117D /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FD1CF9000F007C117D /* Assets.xcassets */; };
 		97C147011CF9000F007C117D /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 97C146FF1CF9000F007C117D /* LaunchScreen.storyboard */; };
+		AD12A159508116180CA4DBF8 /* Pods_Runner.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 254FCDD86784C532FE0FF549 /* Pods_Runner.framework */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXCopyFilesBuildPhase section */
@@ -31,7 +32,9 @@
 /* Begin PBXFileReference section */
 		1498D2321E8E86230040F4C2 /* GeneratedPluginRegistrant.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = GeneratedPluginRegistrant.h; sourceTree = "<group>"; };
 		1498D2331E8E89220040F4C2 /* GeneratedPluginRegistrant.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = GeneratedPluginRegistrant.m; sourceTree = "<group>"; };
+		254FCDD86784C532FE0FF549 /* Pods_Runner.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = Pods_Runner.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		3B3967151E833CAA004F5970 /* AppFrameworkInfo.plist */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.plist.xml; name = AppFrameworkInfo.plist; path = Flutter/AppFrameworkInfo.plist; sourceTree = "<group>"; };
+		51793B029BCFD0D9F974B68A /* Pods-Runner.debug.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.debug.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig"; sourceTree = "<group>"; };
 		74858FAD1ED2DC5600515810 /* Runner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "Runner-Bridging-Header.h"; sourceTree = "<group>"; };
 		74858FAE1ED2DC5600515810 /* AppDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		7AFA3C8E1D35360C0083082E /* Release.xcconfig */ = {isa = PBXFileReference; lastKnownFileType = text.xcconfig; name = Release.xcconfig; path = Flutter/Release.xcconfig; sourceTree = "<group>"; };
@@ -42,19 +45,41 @@
 		97C146FD1CF9000F007C117D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		97C147001CF9000F007C117D /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		97C147021CF9000F007C117D /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		BEF81072DE02D05E1B9A8DB8 /* Pods-Runner.profile.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.profile.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig"; sourceTree = "<group>"; };
+		E872E74B552E8BFDFAD7EA8F /* Pods-Runner.release.xcconfig */ = {isa = PBXFileReference; includeInIndex = 1; lastKnownFileType = text.xcconfig; name = "Pods-Runner.release.xcconfig"; path = "Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig"; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
 		97C146EB1CF9000F007C117D /* Frameworks */ = {
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				AD12A159508116180CA4DBF8 /* Pods_Runner.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		66CE2ECF7C5B7EBD0E9D08A8 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				254FCDD86784C532FE0FF549 /* Pods_Runner.framework */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
+		8604D50E6F34494DF5D8D7EF /* Pods */ = {
+			isa = PBXGroup;
+			children = (
+				51793B029BCFD0D9F974B68A /* Pods-Runner.debug.xcconfig */,
+				E872E74B552E8BFDFAD7EA8F /* Pods-Runner.release.xcconfig */,
+				BEF81072DE02D05E1B9A8DB8 /* Pods-Runner.profile.xcconfig */,
+			);
+			name = Pods;
+			path = Pods;
+			sourceTree = "<group>";
+		};
 		9740EEB11CF90186004384FC /* Flutter */ = {
 			isa = PBXGroup;
 			children = (
@@ -72,6 +97,8 @@
 				9740EEB11CF90186004384FC /* Flutter */,
 				97C146F01CF9000F007C117D /* Runner */,
 				97C146EF1CF9000F007C117D /* Products */,
+				8604D50E6F34494DF5D8D7EF /* Pods */,
+				66CE2ECF7C5B7EBD0E9D08A8 /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -105,12 +132,14 @@
 			isa = PBXNativeTarget;
 			buildConfigurationList = 97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */;
 			buildPhases = (
+				3FC32931F529AB48128449B9 /* [CP] Check Pods Manifest.lock */,
 				9740EEB61CF901F6004384FC /* Run Script */,
 				97C146EA1CF9000F007C117D /* Sources */,
 				97C146EB1CF9000F007C117D /* Frameworks */,
 				97C146EC1CF9000F007C117D /* Resources */,
 				9705A1C41CF9048500538489 /* Embed Frameworks */,
 				3B06AD1E1E4923F5004D2608 /* Thin Binary */,
+				B5F1519081B4E2E2B4548568 /* [CP] Embed Pods Frameworks */,
 			);
 			buildRules = (
 			);
@@ -183,6 +212,28 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" embed_and_thin";
 		};
+		3FC32931F529AB48128449B9 /* [CP] Check Pods Manifest.lock */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+			);
+			inputPaths = (
+				"${PODS_PODFILE_DIR_PATH}/Podfile.lock",
+				"${PODS_ROOT}/Manifest.lock",
+			);
+			name = "[CP] Check Pods Manifest.lock";
+			outputFileListPaths = (
+			);
+			outputPaths = (
+				"$(DERIVED_FILE_DIR)/Pods-Runner-checkManifestLockResult.txt",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "diff \"${PODS_PODFILE_DIR_PATH}/Podfile.lock\" \"${PODS_ROOT}/Manifest.lock\" > /dev/null\nif [ $? != 0 ] ; then\n    # print error to STDERR\n    echo \"error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.\" >&2\n    exit 1\nfi\n# This output is used by Xcode 'outputs' to avoid re-running this script phase.\necho \"SUCCESS\" > \"${SCRIPT_OUTPUT_FILE_0}\"\n";
+			showEnvVarsInLog = 0;
+		};
 		9740EEB61CF901F6004384FC /* Run Script */ = {
 			isa = PBXShellScriptBuildPhase;
 			buildActionMask = 2147483647;
@@ -197,6 +248,23 @@
 			shellPath = /bin/sh;
 			shellScript = "/bin/sh \"$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh\" build";
 		};
+		B5F1519081B4E2E2B4548568 /* [CP] Embed Pods Frameworks */ = {
+			isa = PBXShellScriptBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			inputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-input-files.xcfilelist",
+			);
+			name = "[CP] Embed Pods Frameworks";
+			outputFileListPaths = (
+				"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks-${CONFIGURATION}-output-files.xcfilelist",
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+			shellPath = /bin/sh;
+			shellScript = "\"${PODS_ROOT}/Target Support Files/Pods-Runner/Pods-Runner-frameworks.sh\"\n";
+			showEnvVarsInLog = 0;
+		};
 /* End PBXShellScriptBuildPhase section */
 
 /* Begin PBXSourcesBuildPhase section */

lib/logic/bloc/calculator_bloc.dart

@@ -0,0 +1,122 @@
+import 'package:bloc/bloc.dart';
+import 'package:expression_language/expression_language.dart';
+import 'package:hydrated_bloc/hydrated_bloc.dart';
+import 'package:meta/meta.dart';
+import 'dart:convert';
+part 'calculator_event.dart';
+part 'calculator_state.dart';
+
+class CalculatorBloc extends Bloc<CalculatorEvent, CalculatorState>
+    with HydratedMixin {
+  CalculatorBloc() : super(CalculatorState(text: "")) {}
+
+  var expressionGrammarDefinition = ExpressionGrammarParser({});
+
+  @override
+  Stream<CalculatorState> mapEventToState(
+    CalculatorEvent event,
+  ) async* {
+    if (event is CalculatorAddEvent) {
+      if (event.character == 'C') {
+        yield state.copyWith(text: "", result: "");
+      } else if (event.character == '=') {
+        if (state.results.isNotEmpty &&
+            state.results.last.result == state.text) {
+          print("Www");
+        } else {
+          var parser = expressionGrammarDefinition.build();
+
+          try {
+            var now = state.text;
+            if (now.endsWith('%')) {
+              now = '/100';
+            } else if (now.contains('%')) {
+              now = '/100*';
+            }
+
+            var result = parser.parse(state.text.replaceFirst('%', now));
+            var expression = result.value as Expression;
+            var value = expression.evaluate();
+
+            List<Result> cal = state.results.toList();
+
+            if (cal.length > 10) {
+              cal.removeLast();
+            }
+
+            cal.add(Result(result: value.toString(), data: state.text));
+
+            yield state.copyWith(
+                text: value.toString(), result: "", results: cal);
+
+            print(state
+                .copyWith(
+                  text: "",
+                  result: "",
+                )
+                .toJson());
+          } catch (e) {
+            print(e);
+            yield state.copyWith(
+              text: "Invalid",
+            );
+          }
+        }
+      } else {
+        yield state.copyWith(text: state.text + event.character);
+
+        var parser = expressionGrammarDefinition.build();
+        try {
+          var now = state.text;
+          if (now.endsWith('%')) {
+            now = '/100';
+          } else if (now.contains('%')) {
+            now = '/100*';
+          }
+
+          var result = parser.parse(state.text.replaceFirst('%', now));
+          var expression = result.value as Expression;
+          var value = expression.evaluate();
+          yield state.copyWith(text: state.text, result: value.toString());
+        } catch (e) {
+          yield state.copyWith(text: state.text, result: "");
+        }
+      }
+    } else if (event is CalculatorResultEvent) {
+      yield state.copyWith(text: event.result);
+    } else if (event is CalculatorBackEvent) {
+      yield state.copyWith(
+          text: state.text.substring(0, state.text.length - 1));
+
+      var parser = expressionGrammarDefinition.build();
+      try {
+        var now = state.text;
+        if (now.endsWith('%')) {
+          now = '/100';
+        } else if (now.contains('%')) {
+          now = '/100*';
+        }
+
+        var result = parser.parse(state.text.replaceFirst('%', now));
+        var expression = result.value as Expression;
+        var value = expression.evaluate();
+        yield state.copyWith(text: state.text, result: value.toString());
+      } catch (e) {
+        yield state.copyWith(text: state.text, result: "");
+      }
+    }
+  }
+
+  @override
+  CalculatorState? fromJson(Map<String, dynamic> json) {
+    if (json != null) {
+      return CalculatorState.fromMap(json);
+    }
+    return CalculatorState(text: "");
+  }
+
+  @override
+  Map<String, dynamic>? toJson(CalculatorState state) {
+    return state.toMap();
+  }
+}

lib/logic/bloc/calculator_event.dart

@@ -0,0 +1,20 @@
+part of 'calculator_bloc.dart';
+
+@immutable
+abstract class CalculatorEvent {}
+
+class CalculatorAddEvent extends CalculatorEvent {
+  String character;
+  CalculatorAddEvent({
+    required this.character,
+  });
+}
+
+class CalculatorResultEvent extends CalculatorEvent {
+  String result;
+  CalculatorResultEvent({
+    required this.result,
+  });
+}
+
+class CalculatorBackEvent extends CalculatorEvent {}