markdown-parser/MarkdownParse.java at main · JISOLPARK/markdown-parser · GitHub

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// //https://howtodoinjava.com/java/io/java-read-file-to-string-examples/

// import java.io.IOException;
// import java.nio.file.Files;
// import java.nio.file.Path;
// import java.util.ArrayList;
// import java.util.Scanner;

// public class MarkdownParse {

//     public static ArrayList<String> getLinks(String markdown) {
//         ArrayList<String> toReturn = new ArrayList<>();
//         // find the next [, then find the ], then find the (, then read link upto next )
//         int currentIndex = 0;
//         Scanner scnr = new Scanner(markdown);

//         while(scnr.hasNextLine()) {
//             int openBracket = markdown.indexOf("[", currentIndex);
//             int closeBracket = markdown.indexOf("]", openBracket);
//             int openParen = markdown.indexOf("(", closeBracket);
//             int closeParen = markdown.indexOf(")", openParen);

//             if (openBracket < 0 || closeBracket < 0 || openParen < 0 || closeParen < 0) {
//                 break;
//             }

//             toReturn.add(markdown.substring(openParen - 1, closeParen));
//             currentIndex = closeParen + 1;
//             scnr.nextLine();
//         }
//         scnr.close();

//         return toReturn;
//     }
//https://howtodoinjava.com/java/io/java-read-file-to-string-examples/
//https://github.com/natsukiromero/markdown-parser/blob/main/MarkdownParse.java

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Scanner;

public class MarkdownParse {

    public static ArrayList<String> getLinks(String markdown) {
        ArrayList<String> toReturn = new ArrayList<>();
        Scanner scnr = new Scanner(markdown);
        // find the next [, then find the ], then find the (, then read link up
        // to next )
        int currentIndex = 0;
        while(scnr.hasNextLine()) {
            int openBracket = markdown.indexOf("[", currentIndex);
            int closeBracket = markdown.indexOf("]", openBracket);
            int openParen = markdown.indexOf("(", closeBracket);
            int closeParen = markdown.indexOf(")", openParen);

            // to handle case where one of them loops over the file again
            if (openBracket < 0 || closeBracket < 0 || openParen < 0 ||
                closeParen < 0) {
                break;
            }
            //check to make sure link is not an image
            Boolean isImage = false;
            if(openBracket != 0) {
                String type = markdown.substring(openBracket - 1, openBracket);
                isImage = type.equals("!");
            }

            //check that link follows format []()
            int format = openParen - closeBracket;
            Boolean linkFollowsFormat = true;
            if(format != 1) {
                linkFollowsFormat = false;
            }

            // check that link is a valid link
            String link = markdown.substring(openParen + 1, closeParen);
            Boolean linkHasSpace = link.contains(" ");
            Boolean linkHasBrackets = link.contains("[");
            if(isImage == false && linkHasSpace == false && linkFollowsFormat ==
                true && !(link.isEmpty()) && linkHasBrackets == false) {

                    toReturn.add(link);
            }

            currentIndex = closeParen + 1;
            scnr.nextLine();
        }
        scnr.close();
        return toReturn;
    }

    public static void main(String[] args) throws IOException {
        Path fileName = Path.of(args[0]);
        String content = Files.readString(fileName);
        ArrayList<String> links = getLinks(content);
	    System.out.println(links);
    }
}

//     public static void main(String[] args) throws IOException {
//         Path fileName = Path.of(args[0]);
//         String content = Files.readString(fileName);
//         ArrayList<String> links = getLinks(content);
// 	    System.out.println(links);
//     }
// }