영상편집기 _ single_linked_list

linkedlist.js

/
class Node {
    constructor(data, next = undefined) {
        this.data = data;
        this.next = next;
    }

}
class LinkedList {

    constructor() {
        this.head = undefined;
        this.size = 0;
    }

    addLast(data) {
        let node = new Node(data);
        let current;

        if (!this.head) {
            this.head = node;
        } else {
            current = this.head;

            while (current.next) {
                current = current.next;
            }
            current.next = node;
        }
        this.size++;
    }

    insertion(data, index) {
        //index가 범위를 벗어난 경우
        if (index > this.size) {
            return;
        }

        //index가 0일 경우
        if (index === 0) {
            let node = new Node(data);
            if (!this.head) {
                this.head = node;
                this.size++
                return;
            } else {
                let current = this.head;
                node.next = current;
                this.head = node;
                this.size++;
                return;
            }
        }

        //중간에 insert하는 경우
        const node = new Node(data);
        let current, previous;

        current = this.head;
        while ((index--) !== 0) { //(let count; count++)
            previous = current;
            current = current.next;
        }

        node.next = current;
        previous.next = node;

        this.size++;
    }

    deletion_id(info) {
        console.log(this);

        let id = info[0];
        let current = this.head;
        let previous;

        while (current) {
            if (current.data[0] != id) {
                previous = current;
                current = current.next;
            } else {
                if (this.size === 1) {
                    this.head = null;
                    return;
                }
                if (previous) {
                    previous.next = current.next;
                } else {
                    this.head = current.next
                }

                this.size--;
                return;
            }
        }
    }

    render() {
        let current = this.head;
        let totalPlayingTime = 0;
        let count = 0;
        while (current) {
            count++
            totalPlayingTime += current.data[1];
            current = current.next;
        }
        console.log(`영상클립:${count}개`);
        console.log(`전체길이:${totalPlayingTime}sec`);
    }

    printList() {
        console.log('---영상클립---')
        const alphabet = 'abcdefghijklmnopqrstuvwxyz';
        let current = this.head;
        let count = 1;
        while (current) {
            let nodeId = '';
            for (let i = 0; i < 4; i++) {
                let number = Math.floor(Math.random() * alphabet.length);
                nodeId += alphabet.charAt(number);
            }
            console.log(`제목${count} (${nodeId}): ${current.data}`);
            let listObject = {
                'title': `제목${count}`,
                'id': nodeId,
                'data': current.data
            }
            listArr.push(listObject);

            current = current.next;
            count++;
        }
        return listArr;
    }

    printEdit() {
        let print = "|---"
        let current = this.head;

        while (current) {

            print += `[${current.data[0]}, ${current.data[1]}sec]---`;
            current = current.next;
        }
        print += '---[end]';
        console.log(print);
    }

}


//------------• 재생목록 •-----------------
let listArr = [];
const newList = new LinkedList();
for (i = 1; i < 14; i++) {
    let playTime = Math.ceil(Math.random() * 15);
    newList.addLast(playTime);
}

newList.printList();


//---------------• 편집 •-----------------
const video = new LinkedList();

const readline = require("readline");
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
let input = [];

rl.on("line", function (line) {
    input = line.split(' ')
    const instruction = String(input[0]);
    const editId = String(input[1]);
    const editIndex = Number(input[2]); //insert에 필요함.
    let data;
    let info = [];

    //!한번에 변수로 정의하는 법
    function infoCheck(editId) {
        for (let el of listArr) {
            if (el['id'] == editId) {
                data = el["data"];
                info.push(editId, data);
            }
        }
        return info;
    };

    info = infoCheck(editId)

    //!깔꼼하게쓰는법
    if (instruction === 'add') {
        video.addLast(info);
    }
    if (instruction == 'insert') {
        video.insertion(info, editIndex);
    }
    if (instruction == 'delete') {
        video.deletion_id(info);
    }
    if (instruction == 'render') {
        video.render();
    }
    video.printEdit();
    if (instruction == 'quit') {
        rl.close();
    }
}).on("close", function () {
    process.exit();
});

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