partial implementation of all question types

src/cpp/include/lexer.h

@@ -8,8 +8,10 @@
 enum class TokenType {
     TextFragment,
     QuestionEnd,
+	MatchGroupEnd,
     ElementDashStart,
     ElementPlusStart,
+    ElementOrderModifier,
     Identifier,
     IdentifierStart,
     IdentifierEnd,

src/cpp/include/parser.h

@@ -6,6 +6,7 @@
 #include "lexer.h"
 #include "result.h"
 
+
 struct Question {
     virtual std::string ToString() const = 0;
     virtual ~Question()                  = default;
@@ -16,20 +17,31 @@ struct Choice {
     bool        IsCorrect;
 };
 
-struct SingleAnswerQuestion : public Question {
+enum MultiElementType {
-    std::string ID;
+	Regular     = 0,
-    std::string QuestionText;
+	MultiChoice,
-    std::string Answer;
+	Order
-    std::string Section;
-
-    std::string ToString() const override;
 };
 
-struct MultipleChoiceQuestion : public Question {
+struct MultiElementQuestion : public Question {
     std::string          ID;
     std::string          QuestionText;
     std::vector<Choice>  Choices;
     std::string          Section;
+	MultiElementType     type;
+
+    std::string          ToString() const override;
+};
+
+struct Group {
+    std::string name;
+    std::string elements;
+};
+
+struct GroupQuestion : public Question {
+    std::string        ID;
+    std::string        QuestionText;
+	std::vector<Group> Groups;
 	
     std::string        ToString() const override;
 };

src/cpp/qtapp/main.cpp

@@ -199,17 +199,7 @@ void CreateMdems(std::vector<Question*>& questions) {
 	};
 
 	for (size_t i = 0; i < questions.size(); ++i) {
-		if (SingleAnswerQuestion* sa = dynamic_cast<SingleAnswerQuestion*>(questions[i])) {
+		if (AnswerQuestion* mw = dynamic_cast<AnswerQuestion*>(questions[i])) {
-			mdems[i]->wFrontText->setText(QString::fromStdString(sa->QuestionText));
-			auto answer = sa->Answer; 
-			answer = transformAnswer(answer);
-			answer = std::format("- {}", answer); 
-			mdems[i]->backLabels[0]->setText(QString::fromStdString(answer));
-			if (mdems[i]->wBack->isVisible()) {
-				mdems[i]->wBack->hide();
-			}
-	        mdems[i]->labelCount = 1;
-		} else if (MultipleChoiceQuestion* mw = dynamic_cast<MultipleChoiceQuestion*>(questions[i])) {
 			mdems[i]->wFrontText->setText(
 				QString::fromStdString(mw->QuestionText)	
 			);

src/cpp/transpiler/lexer.cpp

@@ -199,6 +199,26 @@ Result<std::vector<Token>> TokenizeMdem(const std::string& fileRunes) {
                 previousColumn = column;
                 textStarted = false;
                 break;
+            case '^':
+                makeTokenWithTokenBuffer(
+                    TokenType::ElementOrderModifier,
+                    1,
+                    TokenType::TextFragment
+                );
+                previousRow = row;
+                previousColumn = column;
+                textStarted = false;
+                break;
+            case ':':
+                makeTokenWithTokenBuffer(
+                    TokenType::MatchGroupEnd,
+                    1,
+                    TokenType::TextFragment
+                );
+                previousRow = row;
+                previousColumn = column;
+                textStarted = false;
+                break;
             case '>':
                 makeTokenWithTokenBuffer(
                     TokenType::QuestionEnd,
@@ -255,7 +275,9 @@ std::string Token::ToString(const TokenType* ttype) {
     switch (*ttype) {
         case TokenType::TextFragment:           return "text fragment";
         case TokenType::QuestionEnd:            return "question end symbol";
+		case TokenType::MatchGroupEnd:          return "match group end";
         case TokenType::ElementDashStart:       return "dash element start";
+        case TokenType::ElementOrderModifier:   return "order element modifier";
         case TokenType::ElementPlusStart:       return "plus element start";
         case TokenType::Identifier:             return "identifier";
         case TokenType::IdentifierStart:        return "start of identifier";

src/cpp/transpiler/parser.cpp

@@ -14,20 +14,11 @@
 
 struct QuestionElement {
 	bool isDash;
+	bool isGroup;
     std::string content;
 };
 
-std::string SingleAnswerQuestion::ToString() const {
+std::string MultiElementQuestion::ToString() const {
-	return std::format(
-        "<Single choice>:{} section:{} id:{} answer:{}",
-        QuestionText,
-        Section,
-        ID,
-        Answer
-    );
-}
-
-std::string MultipleChoiceQuestion::ToString() const {
     std::stringstream choiceOut;
     for (const auto& choice : Choices) {
         char opener;
@@ -61,17 +52,25 @@ std::map<TokenType, std::vector<TokenType>> parserAutomata() {
         TokenType::QuestionEnd,
         TokenType::ElementDashStart,
         TokenType::ElementPlusStart,
+        TokenType::MatchGroupEnd,
         TokenType::SectionIdentifierStart,
         TokenType::SectionStart,
         TokenType::EndOfFile,
         TokenType::SectionEnd
     };
+    automata[TokenType::MatchGroupEnd] = {
+		TokenType::ElementDashStart
+	};
     automata[TokenType::QuestionEnd] = {
         TokenType::ElementDashStart,
         TokenType::ElementPlusStart
     };
     automata[TokenType::ElementDashStart] = {
         TokenType::IdentifierStart,
+        TokenType::TextFragment,
+        TokenType::ElementOrderModifier
+    };
+    automata[TokenType::ElementOrderModifier] = {
 		TokenType::TextFragment
     };
     automata[TokenType::ElementPlusStart] = {
@@ -165,7 +164,10 @@ Result<std::vector<Question*>> ParseQuestions(const std::vector<Token>& tokens)
 
             std::string id, questionText;
             std::vector<QuestionElement> questionElements;
-            // Parsing for a single question or multiple choice question
+			bool isOrderQuestion = false;
+			bool isGroupQuestion = false;
+
+            // Start element parsing & add to the offset.
             if (tokens[i + 1].tokenType == TokenType::IdentifierStart) {
                 id = tokens[i + 2].content;
                 questionText = tokens[i + 4].content;
@@ -176,17 +178,30 @@ Result<std::vector<Question*>> ParseQuestions(const std::vector<Token>& tokens)
                 i += 3;
             }
 
-            while (true) {
+			auto isInBounds = [tokens](size_t i) {
-                if (i + 3 < tokens.size() && tokens[i + 3].tokenType != TokenType::EndOfFile) {
+				return i < tokens.size() && tokens[i].tokenType != TokenType::EndOfFile; 
-                    size_t offset = tokens[i + 1].tokenType == TokenType::IdentifierStart ? 5 : 2;
+			};
-					if (tokens[i].tokenType == TokenType::SectionIdentifierStart ||
+
-					    tokens[i].tokenType == TokenType::SectionEnd) {
+			// Parse elements of a question.
+            while (isInBounds(i)) {
+
+				// Handle other constructs.
+				if (tokens[i].tokenType == TokenType::SectionIdentifierStart) {
 					break;
 				}
-                    if (i + offset < tokens.size() && tokens[i + offset].tokenType == TokenType::QuestionEnd) {
+				if (tokens[i].tokenType == TokenType::SectionEnd) {
+					break;
+				}
+
+				// Check question end.
+                if (tokens[i].tokenType == TokenType::ElementDashStart && isInBounds(i + 3)) {
+					// Distance to the possible question end.
+					size_t offset = tokens[i + 1].tokenType == TokenType::IdentifierStart ? 5 : 2;
+                    if (isInBounds(i + offset) && tokens[i + offset].tokenType == TokenType::QuestionEnd) {
                         break;
                     }
                     if (offset == 5 && tokens[i + 5].tokenType != TokenType::QuestionEnd) {
+						// Cannot place the identifier on the ordinary element.
                         return {
 							questions,
 							"Invalid identifier placement",
@@ -195,42 +210,72 @@ Result<std::vector<Question*>> ParseQuestions(const std::vector<Token>& tokens)
 						};
                     }
                 }
-                if (i + 2 >= tokens.size()) {
+				
-                    break;
+				// Determine element type.
+				bool isDash;
+				bool isGroup = false;
+                if (isInBounds(i+1) && tokens[i].tokenType == TokenType::ElementOrderModifier) {
+					isOrderQuestion = true;
+					if (!isDash) {
+						// TODO: err
+					}
+				}
+                if (tokens[i].tokenType == TokenType::ElementDashStart) {
+					isDash = true;
+					if (isOrderQuestion) {
+						// TODO: err
+					}
+				} else {
+					isDash = false;
+				}
+				if (isInBounds(i+2) && tokens[i].tokenType == TokenType::MatchGroupEnd) {
+					isGroup         = true;
+					isGroupQuestion = true;
+					if (!isDash) {
+						// TODO: err
+					}
+					if (isOrderQuestion) {
+						// TODO: err
+					}
 				}
 
-                // Create question elements
                 QuestionElement questionElement;
-                questionElement.isDash = (tokens[i].tokenType == TokenType::ElementDashStart);
+                questionElement.isDash  = isDash;
+				questionElement.isGroup = isGroup;
                 questionElement.content = tokens[i + 1].content;
                 questionElements.push_back(questionElement);
-                i += 2;
+
+				size_t offset = 2;
+				if (isOrderQuestion) {
+					offset += 1;
+				}
+				if (isGroup) {
+					offset += 1;
+				}
+
+                i += offset;
             }
 
             if (questionElements.size() > 1) {
-                auto* mcq = new MultipleChoiceQuestion();
+				if (isGroupQuestion) {
-                mcq->ID = id;
+					GroupQuestion *question = new GroupQuestion();
-                mcq->QuestionText = questionText;
+					// TODO
+
+				} if (isOrderQuestion) {
+					auto *question = new MultiElementQuestion();
+					question->ID = id;
+					question->QuestionText = questionText;
 					for (const auto& elem : questionElements) {
 						Choice choice;
 						choice.Answer = elem.content;
 						choice.IsCorrect = !elem.isDash;
-                    mcq->Choices.push_back(choice);
+						question->Choices.push_back(choice);
 					}
-                mcq->Section = section;
+					question->Section = section;
-                questions.push_back(mcq);
+					questions.push_back(question);
 					if (debug) {
-					std::cout << mcq->ToString() << "\n";
+					std::cout << question->ToString() << "\n";
 					}
-            } else if (questionElements.size() == 1) {
-                auto* saq = new SingleAnswerQuestion();
-                saq->ID = id;
-                saq->QuestionText = questionText;
-                saq->Answer = questionElements[0].content;
-                saq->Section = section;
-                questions.push_back(saq);
-				if (debug) {
-					std::cout << saq->ToString() << "\n";
 				}
             }
         } else if (tokens[i].tokenType == TokenType::SectionIdentifierStart) {

tasks.md

@@ -0,0 +1,37 @@
+## 1-N Answer question
+
+- kfoewf >
+    - fiewfiwe
+
+- kfoewf >
+    - fiewfiwe
+    - fewpfowe
+    - fweofopew
+    - ofpewpofkew
+
+## Order question
+
+- ewjpfwe >
+    ^- ewijfew
+    ^- ewijfew
+    ^- ewijfew
+    ^- ewijfew
+    ^- ewijfew
+
+## Match question
+
+- iowjefew >
+    - fiwfo:
+        - fewfew
+        - ifoewf
+    - ejpfe:
+        - _
+    - fewfw:
+        - fewjpfe
+        - fioewf
+
+- [ ] Augment the lexer for Order and match question;
+- [ ] Parse the questions accordingly; 
+- [ ] Escape character;
+
+