can get exact answers

src/features/local/quizzes/models/utils/quizQuestionAnswerMarkdownUtils.ts

@@ -1,5 +1,29 @@
-import { QuestionType } from "../localQuizQuestion";
+import { LocalQuizQuestion, QuestionType } from "../localQuizQuestion";
 import { LocalQuizQuestionAnswer } from "../localQuizQuestionAnswer";
+const _validFirstAnswerDelimiters = [
+  "*a)",
+  "a)",
+  "*)",
+  ")",
+  "[ ]",
+  "[]",
+  "[*]",
+  "^",
+  "=",
+];
+const _multipleChoicePrefix = ["a)", "*a)", "*)", ")"];
+const _multipleAnswerPrefix = ["[ ]", "[*]", "[]"];
+
+const parseNumericalAnswer = (input: string): LocalQuizQuestionAnswer => {
+  const numericValue = parseFloat(input.replace(/^=\s*/, "").trim());
+  const answer: LocalQuizQuestionAnswer = {
+    correct: true,
+    text: input.trim(),
+    numericalAnswerType: "exact_answer",
+    numericAnswer: numericValue,
+  };
+  return answer;
+};
 
 const parseMatchingAnswer = (input: string) => {
   const matchingPattern = /^\^?/;
@@ -13,11 +37,51 @@ const parseMatchingAnswer = (input: string) => {
   return answer;
 };
 
+const getAnswerStringsWithMultilineSupport = (
+  linesWithoutPoints: string[],
+  questionIndex: number
+) => {
+  const indexOfAnswerStart = linesWithoutPoints.findIndex((l) =>
+    _validFirstAnswerDelimiters.some((prefix) =>
+      l.trimStart().startsWith(prefix)
+    )
+  );
+  if (indexOfAnswerStart === -1) {
+    const debugLine = linesWithoutPoints.find((l) => l.trim().length > 0);
+    throw Error(
+      `question ${
+        questionIndex + 1
+      }: no answers when detecting question type on ${debugLine}`
+    );
+  }
+
+  const answerLinesRaw = linesWithoutPoints.slice(indexOfAnswerStart);
+
+  const answerStartPattern = /^(\*?[a-z]?\))|(?<!\S)\[\s*\]|\[\*\]|\^/;
+  const answerLines = answerLinesRaw.reduce((acc: string[], line: string) => {
+    const isNewAnswer = answerStartPattern.test(line);
+    if (isNewAnswer) {
+      acc.push(line);
+    } else if (acc.length !== 0) {
+      acc[acc.length - 1] += "\n" + line;
+    } else {
+      acc.push(line);
+    }
+    return acc;
+  }, []);
+  return answerLines;
+};
+
 export const quizQuestionAnswerMarkdownUtils = {
+  parseMarkdown(
+    input: string,
+    questionType: QuestionType
+  ): LocalQuizQuestionAnswer {
+    if (questionType === QuestionType.NUMERICAL) {
+      return parseNumericalAnswer(input);
+    }
 
-  parseMarkdown(input: string, questionType: string): LocalQuizQuestionAnswer {
     const isCorrect = input.startsWith("*") || input[1] === "*";
-
     if (questionType === QuestionType.MATCHING) {
       return parseMatchingAnswer(input);
     }
@@ -35,4 +99,112 @@ export const quizQuestionAnswerMarkdownUtils = {
     };
     return answer;
   },
+  isAnswerLine: (trimmedLine: string): boolean => {
+    return _validFirstAnswerDelimiters.some((prefix) =>
+      trimmedLine.startsWith(prefix)
+    );
+  },
+  getQuestionType: (
+    linesWithoutPoints: string[],
+    questionIndex: number // needed for debug logging
+  ): QuestionType => {
+    const lastLine = linesWithoutPoints[linesWithoutPoints.length - 1]
+      .toLowerCase()
+      .trim();
+    if (linesWithoutPoints.length === 0) return QuestionType.NONE;
+    if (lastLine === "essay") return QuestionType.ESSAY;
+    if (lastLine === "short answer") return QuestionType.SHORT_ANSWER;
+    if (lastLine === "short_answer") return QuestionType.SHORT_ANSWER;
+    if (lastLine === "short_answer=")
+      return QuestionType.SHORT_ANSWER_WITH_ANSWERS;
+    if (lastLine.startsWith("=")) return QuestionType.NUMERICAL;
+
+    const answerLines = getAnswerStringsWithMultilineSupport(
+      linesWithoutPoints,
+      questionIndex
+    );
+    const firstAnswerLine = answerLines[0];
+    const isMultipleChoice = _multipleChoicePrefix.some((prefix) =>
+      firstAnswerLine.startsWith(prefix)
+    );
+
+    if (isMultipleChoice) return QuestionType.MULTIPLE_CHOICE;
+
+    const isMultipleAnswer = _multipleAnswerPrefix.some((prefix) =>
+      firstAnswerLine.startsWith(prefix)
+    );
+    if (isMultipleAnswer) return QuestionType.MULTIPLE_ANSWERS;
+
+    const isMatching = firstAnswerLine.startsWith("^");
+    if (isMatching) return QuestionType.MATCHING;
+
+    return QuestionType.NONE;
+  },
+  getAnswers: (
+    linesWithoutPoints: string[],
+    questionIndex: number,
+    questionType: QuestionType
+  ): { answers: LocalQuizQuestionAnswer[]; distractors: string[] } => {
+    const typesWithAnswers: QuestionType[] = [
+      QuestionType.MULTIPLE_CHOICE,
+      QuestionType.MULTIPLE_ANSWERS,
+      QuestionType.MATCHING,
+      QuestionType.SHORT_ANSWER_WITH_ANSWERS,
+      QuestionType.NUMERICAL,
+    ];
+    if (!typesWithAnswers.includes(questionType)) {
+      return { answers: [], distractors: [] };
+    }
+
+    if (questionType == QuestionType.SHORT_ANSWER_WITH_ANSWERS)
+      linesWithoutPoints = linesWithoutPoints.slice(
+        0,
+        linesWithoutPoints.length - 1
+      );
+
+    const answerLines = getAnswerStringsWithMultilineSupport(
+      linesWithoutPoints,
+      questionIndex
+    );
+
+    const allAnswers = answerLines.map((a) =>
+      quizQuestionAnswerMarkdownUtils.parseMarkdown(a, questionType)
+    );
+
+    // For matching questions, separate answers from distractors
+    if (questionType === QuestionType.MATCHING) {
+      const answers = allAnswers.filter((a) => a.text);
+      const distractors = allAnswers
+        .filter((a) => !a.text)
+        .map((a) => a.matchedText ?? "");
+      return { answers, distractors };
+    }
+
+    return { answers: allAnswers, distractors: [] };
+  },
+
+  getAnswerMarkdown: (
+    question: LocalQuizQuestion,
+    answer: LocalQuizQuestionAnswer,
+    index: number
+  ): string => {
+    const multilineMarkdownCompatibleText = answer.text.startsWith("```")
+      ? "\n" + answer.text
+      : answer.text;
+
+    if (question.questionType === "multiple_answers") {
+      const correctIndicator = answer.correct ? "*" : " ";
+      const questionTypeIndicator = `[${correctIndicator}] `;
+
+      return `${questionTypeIndicator}${multilineMarkdownCompatibleText}`;
+    } else if (question.questionType === "matching") {
+      return `^ ${answer.text} - ${answer.matchedText}`;
+    } else {
+      const questionLetter = String.fromCharCode(97 + index);
+      const correctIndicator = answer.correct ? "*" : "";
+      const questionTypeIndicator = `${correctIndicator}${questionLetter}) `;
+
+      return `${questionTypeIndicator}${multilineMarkdownCompatibleText}`;
+    }
+  },
 };