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FOCS Grade Calculator

Calculate your FOCS grade on gradescope

目前為 2019-02-25 提交的版本，檢視 最新版本。

// ==UserScript==
// @name         FOCS Grade Calculator
// @namespace    https://aaron1011.pw
// @version      0.1.1
// @description  Calculate your FOCS grade on gradescope
// @author       Aaron1011
// @match        https://www.gradescope.com/courses/35880
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    function percentToLetter(percent) {
        percent = Math.round(percent * 100);
        // Each list item is of the form [minimum score, letter grade]
        var table = [[93, "A"], [90, "A-"], [87, "B+"], [83, "B"], [80, "B-"], [77, "C+"], [73, "C"], [70, "C-"], [67, "D+"], [60, "D"], [0, "F"]];
        for (var i = 0; i < table.length; i++) {
            if (percent >= table[i][0]) {
                return table[i][1];
            }
        }
        throw new Error("Impossible case reached for percent " + percent);
    }

    function calculate(homeworkAvg, exam1, exam2, final) {
        // https://www.cs.rpi.edu/~pattes3/csci2200/general-info-2019.pdf
        var total = (0.2 * (homeworkAvg)) + (0.25 * exam1) + (0.25 * exam2) + (0.3 * final);
        var letter = percentToLetter(total);
        return {
            total: total,
            letter: letter
        }
    }


    function injectCalculator(data) {
        var section = $("section");
        var wrapperDiv = $("<div id='focs-grade-calculator-tampermonkey'>")
        var title = $("<h2><br/><br/>FOCS Grade calculator script</h2></br><h3>Formula: ((0.2 * HW) + (.25 * Exam1) + (.25 * Exam2) + (.30 * FinalExam)) [from <a href='https://www.cs.rpi.edu/~pattes3/csci2200/general-info-2019.pdf'>https://www.cs.rpi.edu/~pattes3/csci2200/general-info-2019.pdf</a>]</h3><br/>");

        var finalGrade = $("<p>");
        var finalGradeLetter = $("<p>");
        wrapperDiv.append(title);

        var homeworkValues = [];
        var exam1 = data.exam1;
        var exam2 = data.exam2;
        var final = data.final;

        function recalculate() {
            var newHomeworkTotal = data.homeworkTotal;
            for (var i = 0; i < homeworkValues.length; i++) {
                newHomeworkTotal += homeworkValues[i];
            }

            var homeworkAvg = newHomeworkTotal / (data.numHomeworks + homeworkValues.length);
            var newOverall = calculate(homeworkAvg, exam1, exam2, final);
            finalGrade.text("Overall score: " + (newOverall.total * 100).toFixed(2));
            finalGradeLetter.text("Letter grade: " + newOverall.letter);
        }

        function onChange(i, score, entry) {
            var normalizedScore = score / 100;
            if (normalizedScore > 1 || normalizedScore < 0) {
                throw new Error("Impossible normalized score " + normalizedScore + " " + score);
            }

            if (entry.type === "homework") {
                homeworkValues[i] = normalizedScore;
            } else if (entry.type == "exam1") {
                exam1 = normalizedScore;
            } else if (entry.type == "exam2") {
                exam2 = normalizedScore;
            } else if (entry.type == "final") {
                final = normalizedScore;
            }

            recalculate();
        }

        for (var i = 0; i < data.graded.length; i++) {
            var entry = data.graded[i];
            var label = $("<label />");
            label.text(entry.value);
            wrapperDiv.append(label);
            wrapperDiv.append($("<br/>"));
        }

        for (var i = 0; i < data.ungraded.length; i++) {
            (function(i) {
                var entry = data.ungraded[i];
                var sliderWrapper = $("<div>", {id: "focs-grade-calculator-tampermonkey-homework-slider-wrapper-" + entry.name});

                var sliderName = "focs-grade-calculator-tampermonkey-homework-slider-" + entry.name;


                var sliderLabel = $('<label />', {for: sliderName});
                sliderLabel.text(entry.name + " percentage:");
                var sliderVal = $('<input type="text" value="80" style="width: 40px"/>');

                var slider = $('<input type="range" min="0" max="100" value="80" />', {name: sliderName});
                slider[0].addEventListener('input', function() {
                    var score = slider[0].value;
                    sliderVal.val(score);
                    onChange(i, score, entry);
                });

                sliderVal[0].addEventListener('input', function() {
                    var score = sliderVal[0].value;
                    slider.val(score);
                    onChange(i, score, entry);
                })

                if (entry.type == "homework") {
                    homeworkValues.push(.8);
                }

                sliderWrapper.append(sliderLabel);
                sliderWrapper.append(sliderVal);
                sliderWrapper.append(slider);

                wrapperDiv.append(sliderWrapper);
            })(i);
        }

        wrapperDiv.append(finalGrade);
        //wrapperDiv.append($("<br/>"));
        wrapperDiv.append(finalGradeLetter);
        section.append(wrapperDiv);

        recalculate();

       //console.log("Your current overall score: " + total + " with letter grade " + letter);
    }

    var assignments = $("tbody tr");
    var homeworkTotal = 0;
    var numHomeworks = 0;
    var exam1 = -1;
    var exam2 = -1;
    var final = -1;

    var graded = [];

    for (var i = 0; i < assignments.length; i++) {
        var assignment = $(assignments[i]);
        var name = assignment.find(".table--primaryLink").text();
        var score = assignment.find(".submissionStatus--score").text();
        var scoreFrac = "<No Score>";

        if (score !== "") {
            var split = score.split("/");
            scoreFrac = parseFloat(split[0]) / parseFloat(split[1]);
            if (name.startsWith("Homework")) {
                homeworkTotal += scoreFrac;
                numHomeworks++;
                graded.push({value: name + " (graded): " + Math.round(scoreFrac * 100)});
            } else if (name.startsWith("Exam 1")) {
                exam1 = scoreFrac;
                graded.push({value: "Exam 1: (graded): " + Math.round(scoreFrac * 100)});
            } else if (name.startsWith("Exam 2")) {
                exam2 = scoreFrac;
                graded.push({value: "Exam 2: (graded): " + Math.round(scoreFrac * 100)});
            }
        }

        console.log("Assignment: " + name);
        console.log("Score: " + scoreFrac);
    }

    var ungraded = [];
    // There are eight homeworks total
    for (var j = numHomeworks + 1; j <= 8; j++) {
        ungraded.push({name: "Homework " + j, type: "homework", min: 0, max: 50});
    }

    if (exam1 == -1) {
        console.error("Exam 1 has not been graded! Using score of 80 for exam 1 score!");
        exam1 = 80;
        ungraded.push({name: "Exam 1", type: "exam1", min: 0, max: 100});
    }

    if (exam2 == -1) {
        console.error("Exam 2 has not been graded! Using exam 1 score of " + exam1 + " for exam 2 score");
        ungraded.push({name: "Exam 2", type: "exam2", min: 0, max: 100});
        exam2 = exam1;
    }
    if (final == -1) {
        console.error("Final exam has not been graded! Using exam 2 score of " + exam2 + " for final exam score");
        ungraded.push({name: "Final exam", type: "final", min: 0, max: 100});
        final = exam2;
    }

    var data = {
        ungraded: ungraded,
        graded: graded,
        homeworkTotal: homeworkTotal,
        numHomeworks: numHomeworks,
        exam1: exam1,
        exam2: exam2,
        final: final
    }

    injectCalculator(data);
})();

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