shahnevis-core/dist/utils/handleLine.js

**Shahnevis Core** is a lightweight and flexible library for building custom code editors. It provides essential features like syntax highlighting, a minimap, multi-cursor support, line numbering, and plugin management. This library is framework-agnostic,

/* 
This file is part of Shahnevis Core.

Copyright (C) 2024 shahrooz saneidarani (github.com/shahroozD)

Shahnevis Core is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Shahnevis Core is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { updateSyntaxHighlighting } from '../core/highlighting.js';
import { computeTotalSpan, updateFoldedBlocksAfterSwap } from './folding.js';

// moveLine =====================
// Function to move line up
function moveLineUp(editor, foldingUtils) {
  var _lines$lineIndex;
  var foldedBlocks = foldingUtils.getFoldedBlocksById();
  var cursorPosition = editor.selectionStart;
  var lines = editor.value.split("\n");

  // Get the line number of the cursor
  var lineIndex = editor.value.substring(0, cursorPosition).split("\n").length - 1;
  var actualLineIndex = editor.value.substring(0, cursorPosition).split("\n").length - 1;
  var lastBlockNumber = 0;
  var lastBlockSize = 0;
  for (var key in foldedBlocks) {
    var numKey = parseInt(key, 10);
    if ((numKey > lastBlockNumber + lastBlockSize || lastBlockNumber == 0) && numKey < actualLineIndex) {
      lastBlockNumber = numKey;
      if (lastBlockNumber != 0) lastBlockSize = 0;
    }
    if (numKey < actualLineIndex) {
      actualLineIndex += foldedBlocks[key].length;
      lastBlockSize += foldedBlocks[key].length;
    } else break;
  }

  // If it's the first line, do nothing
  if (lineIndex === 0) return;

  // Swap the current line with the previous line
  var temp = lines[lineIndex];
  lines[lineIndex] = lines[lineIndex - 1];
  lines[lineIndex - 1] = temp;
  console.log("???????????????????");

  // Update the editor content
  editor.value = lines.join("\n");
  foldingUtils.updateFoldedBlocks(updateFoldedBlocksAfterSwap(foldedBlocks, actualLineIndex, foldedBlocks[actualLineIndex - lastBlockSize - 1] ? lastBlockNumber : actualLineIndex - 1));
  // Restore the cursor position
  var newCursorPos = cursorPosition - ((_lines$lineIndex = lines[lineIndex]) === null || _lines$lineIndex === void 0 ? void 0 : _lines$lineIndex.length) - 1; // Adjust cursor for the swapped line
  editor.selectionStart = editor.selectionEnd = newCursorPos;
}

// Function to move line down
function moveLineDown(editor, foldingUtils) {
  var _lines$lineIndex2;
  var foldedBlocks = foldingUtils.getFoldedBlocksById();
  var cursorPosition = editor.selectionStart;
  var lines = editor.value.split("\n");

  // Get the line number of the cursor
  var lineIndex = editor.value.substring(0, cursorPosition).split("\n").length - 1;
  var actualLineIndex = editor.value.substring(0, cursorPosition).split("\n").length - 1;
  for (var key in foldedBlocks) {
    var numKey = parseInt(key, 10);
    if (numKey < actualLineIndex) actualLineIndex += foldedBlocks[key].length;else break;
  }

  // If it's the last line, do nothing
  if (lineIndex === lines.length - 1) return;

  // Swap the current line with the next line
  var temp = lines[lineIndex];
  lines[lineIndex] = lines[lineIndex + 1];
  lines[lineIndex + 1] = temp;

  // Update the editor content
  editor.value = lines.join("\n");
  foldingUtils.updateFoldedBlocks(updateFoldedBlocksAfterSwap(foldedBlocks, actualLineIndex, actualLineIndex + 1));

  // Restore the cursor position
  var newCursorPos = cursorPosition + ((_lines$lineIndex2 = lines[lineIndex]) === null || _lines$lineIndex2 === void 0 ? void 0 : _lines$lineIndex2.length) + 1; // Adjust cursor for the swapped line
  editor.selectionStart = editor.selectionEnd = newCursorPos;
}
export function handleMoveLine(e, editor, foldingUtils) {
  if (e.altKey) {
    if (e.key === 'ArrowUp') {
      e.preventDefault(); // Prevent default browser behavior (if any)
      moveLineUp(editor, foldingUtils);
    } else if (e.key === 'ArrowDown') {
      e.preventDefault(); // Prevent default browser behavior (if any)
      moveLineDown(editor, foldingUtils);
    }
  }
  // Update syntax highlighting if needed
  var highlight = null;
  updateSyntaxHighlighting(editor, highlight);
}
// moveLine =====================

// multi-line ===================
var anchorLineStart = null;
var anchorLineEnd = null;

// Function to handle multi-line selection
function multiLineSelect(direction, editor) {
  var cursorPosition = editor.selectionStart;
  var lines = editor.value.split("\n");

  // Get the current line number
  var lineIndex = editor.value.substring(0, cursorPosition).split("\n").length - 1;

  // Initialize anchor points if this is the first multi-line select
  if (anchorLineStart === null || anchorLineEnd === null) {
    anchorLineStart = lineIndex;
    anchorLineEnd = lineIndex;
  }

  // Move selection up or down
  if (direction === 'up' && anchorLineStart > 0) {
    anchorLineStart--;
  } else if (direction === 'down' && anchorLineEnd < lines.length - 1) {
    anchorLineEnd++;
  }

  // Select from the anchor start line to the anchor end line
  var start = getPositionForLine(anchorLineStart, editor);
  var end = getPositionForLine(anchorLineEnd, editor) + lines[anchorLineEnd].length;
  editor.setSelectionRange(start, end);
}

// Get the cursor position at the start of a given line
function getPositionForLine(lineIndex, editor) {
  var lines = editor.value.split("\n");
  var position = 0;
  for (var i = 0; i < lineIndex; i++) {
    position += lines[i].length + 1; // +1 for the newline character
  }
  return position;
}

// handle for Ctrl + Alt + Arrow keys
export function handleMultiSelect(e, editor) {
  if (e.ctrlKey && e.altKey) {
    if (e.key === 'ArrowUp') {
      e.preventDefault(); // Prevent default browser behavior
      multiLineSelect('up', editor);
    } else if (e.key === 'ArrowDown') {
      e.preventDefault(); // Prevent default browser behavior
      multiLineSelect('down', editor);
    }
  }
  // Update syntax highlighting if needed
  var highlight = null;
  updateSyntaxHighlighting(editor, highlight);
}

// Function to reset anchor points when the selection is cleared or changed manually
export function resetAnchorPoints(editor) {
  editor.addEventListener('click', function () {
    anchorLineStart = null;
    anchorLineEnd = null;
  });
  editor.addEventListener('input', function () {
    anchorLineStart = null;
    anchorLineEnd = null;
  });
}

// multi-line ===================