Java Community | Help. Code. Learn.•4mo ago

How would I hide a specific Character in a ListArray

Basically, i'm making a simple terminal file editor, which has basic syntax highlighting. I'm facing an issue where the character used for the 'cursor' (which is controlled by arrow keys) is fucking up the syntax highlighting. I use 2 variables which store its location (currentLine, and currentColumn), so how would I hide it or something off the syntax highlighting function? Code:

    static public int currentColumn = 0;
    static public int currentLine = 0;
    static private List<String> fileArray = new ArrayList<>();

    public static String highlightSyntax(String line) { // Highlight syntax
        line = line.replaceAll("\\bdef\\b", RED + "def" + RESET)
            .replaceAll("\\bwhile\\b", RED + "while" + RESET)
            .replaceAll("\\bprint\\b", YELLOW + "print" + RESET)
            .replaceAll("\\bif\\b", RED + "if" + RESET)
            .replaceAll("\\belse\\b", RED + "else" + RESET)
            .replaceAll("\\bint\\b", GREEN + "int" + RESET);
        return line;
    }

    static public int currentColumn = 0;
    static public int currentLine = 0;
    static private List<String> fileArray = new ArrayList<>();

    public static String highlightSyntax(String line) { // Highlight syntax
        line = line.replaceAll("\\bdef\\b", RED + "def" + RESET)
            .replaceAll("\\bwhile\\b", RED + "while" + RESET)
            .replaceAll("\\bprint\\b", YELLOW + "print" + RESET)
            .replaceAll("\\bif\\b", RED + "if" + RESET)
            .replaceAll("\\belse\\b", RED + "else" + RESET)
            .replaceAll("\\bint\\b", GREEN + "int" + RESET);
        return line;
    }

15 Replies

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explementOP•4mo ago

let me know if u need the rest of the code aswell

ayylmao123xdd•4mo ago

can u show the cursor code

explementOP•4mo ago

this is the code to set the line/col:

    public static void controlKeys(int index) {
        removeCursor(); // Remove the current cursor
    
        switch (index) {
            case 1: // Left arrow key
                currentColumn = Math.max(0, currentColumn - 1);
                break;
            case 2: // Right arrow key
                currentColumn = Math.min(fileArray.get(currentLine).length(), currentColumn + 1);
                break;
            case 3: // Up arrow key
                if (currentLine > 0) {
                    currentLine--;
                    currentColumn = Math.min(currentColumn, fileArray.get(currentLine).length());
                }
                break;
            case 4: // Down arrow key
                if (currentLine < fileArray.size() - 1) {
                    currentLine++;
                    currentColumn = Math.min(currentColumn, fileArray.get(currentLine).length());
                }
                break;
            default:
                System.out.println("Error");
                return;
        }
    
        updateCursor(); 
    }

    public static void controlKeys(int index) {
        removeCursor(); // Remove the current cursor
    
        switch (index) {
            case 1: // Left arrow key
                currentColumn = Math.max(0, currentColumn - 1);
                break;
            case 2: // Right arrow key
                currentColumn = Math.min(fileArray.get(currentLine).length(), currentColumn + 1);
                break;
            case 3: // Up arrow key
                if (currentLine > 0) {
                    currentLine--;
                    currentColumn = Math.min(currentColumn, fileArray.get(currentLine).length());
                }
                break;
            case 4: // Down arrow key
                if (currentLine < fileArray.size() - 1) {
                    currentLine++;
                    currentColumn = Math.min(currentColumn, fileArray.get(currentLine).length());
                }
                break;
            default:
                System.out.println("Error");
                return;
        }
    
        updateCursor(); 
    }

and this is the code that updates the actual arraylist

    private static void updateCursor() { // Update cursor
        String currentItem = fileArray.get(currentLine);
        String modifiedItem = currentItem.substring(0, currentColumn) + "|" + currentItem.substring(currentColumn);
        fileArray.set(currentLine, modified);

        displayArrayContent();
    }

    private static void updateCursor() { // Update cursor
        String currentItem = fileArray.get(currentLine);
        String modifiedItem = currentItem.substring(0, currentColumn) + "|" + currentItem.substring(currentColumn);
        fileArray.set(currentLine, modified);

        displayArrayContent();
    }

ayylmao123xdd•4mo ago

 public static String highlightSyntax(String line) { // Highlight syntax
        line = line.replaceAll("\\bdef\\b", RED + "def" + RESET)
            .replaceAll("\\bwhile\\b", RED + "while" + RESET)
            .replaceAll("\\bprint\\b", YELLOW + "print" + RESET)
            .replaceAll("\\bif\\b", RED + "if" + RESET)
            .replaceAll("\\belse\\b", RED + "else" + RESET)
            .replaceAll("\\bint\\b", GREEN + "int" + RESET);
        return line;
    }

 public static String highlightSyntax(String line) { // Highlight syntax
        line = line.replaceAll("\\bdef\\b", RED + "def" + RESET)
            .replaceAll("\\bwhile\\b", RED + "while" + RESET)
            .replaceAll("\\bprint\\b", YELLOW + "print" + RESET)
            .replaceAll("\\bif\\b", RED + "if" + RESET)
            .replaceAll("\\belse\\b", RED + "else" + RESET)
            .replaceAll("\\bint\\b", GREEN + "int" + RESET);
        return line;
    }

so you want this to ignore the cursor right that is just |

explementOP•4mo ago

yes because it can get in the middle of keywords and then instead of for example 'def' (which is colored red), it would be 'd|ef' which wont have any color at all

ayylmao123xdd•4mo ago

hm what about if you make another variable where you get rid of the cursor then do all the color stuff and then after doing it you add the cursor back that could work

explementOP•4mo ago

so like have a variable for the arraylist with the cursor removed and then apply color?

ayylmao123xdd•4mo ago

yea and then after you apply the color you add the cursor back

explementOP•4mo ago

quick question tho, how do i access a specific character of a object in a arraylist because i cant really find anyway of how to do this i know how to access an object like if the array list was ["AAA, "BBB', "CCC"] i know i could do like .delete(0) to delete "AAA", but how would i say delete the middle A of it

ayylmao123xdd•4mo ago

uh string.find i think sorry

line.indexOf("|")

line.indexOf("|")

and u get the index u gotta remember the position of the cursor to put it back after editing so ye use indexof

explementOP•4mo ago

alright

ayylmao123xdd•4mo ago

lmk if i was right about the solution l0l

explementOP•4mo ago

tryin to implement it, will let u know

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How would I hide a specific Character in a ListArray

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