shahnevis-core/dist/utils/stackUtils.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,

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/* 
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/>.
*/
// utils/stackUtils.js

// 1) Save a snapshot immediately
export function saveSnapshot(manager, editor, foldingUtils) {
  if (manager.isUndoRedo) return;
  var snap = {
    text: editor.value,
    foldedBlocks: JSON.parse(JSON.stringify(foldingUtils.getFoldedBlocksById())),
    cursorStart: editor.selectionStart,
    cursorEnd: editor.selectionEnd
  };
  manager.undoStack.push(snap);
  manager.redoStack = [];
  if (manager.undoStack.length > manager.maxHistory) {
    manager.undoStack.shift();
  }
}

// 2) Debounced save
export function debounceSnapshot(manager, editor, foldingUtils, onChange) {
  clearTimeout(manager.debounceId);
  manager.debounceId = setTimeout(function () {
    saveSnapshot(manager, editor, foldingUtils);
    onChange(function (prevState) {
      return _objectSpread(_objectSpread({}, prevState), {}, {
        undoStack: _toConsumableArray(manager.undoStack),
        redoStack: _toConsumableArray(manager.redoStack)
      });
    });
  }, 300);
}

/**
 * Undo the last snapshot: restore text + foldedBlocks, and push current state into redoStack.
 */
function undo(manager, editor, foldingUtils, onChange) {
  if (!manager.undoStack.length) return;

  // Decide whether to pop or just peek
  var prev;
  if (manager.undoStack.length < 2) {
    // Only one snapshot: peek at it but don't remove
    prev = manager.undoStack[0];
  } else {
    // More than one: pop the top snapshot
    prev = manager.undoStack.pop();

    // Push current state into redoStack
    manager.redoStack.push({
      text: editor.value,
      foldedBlocks: JSON.parse(JSON.stringify(foldingUtils.getFoldedBlocksById())),
      cursorStart: editor.selectionStart,
      cursorEnd: editor.selectionEnd
    });
  }
  manager.isUndoingOrRedoing = true;
  editor.value = prev.text;
  editor.selectionStart = prev.cursorStart;
  editor.selectionEnd = prev.cursorEnd;
  foldingUtils.updateFoldedBlocks(prev.foldedBlocks);

  // Notify React state if provided
  if (typeof onChange === 'function') {
    onChange(function (prevState) {
      return _objectSpread(_objectSpread({}, prevState), {}, {
        undoStack: _toConsumableArray(manager.undoStack),
        redoStack: _toConsumableArray(manager.redoStack)
      });
    });
  }
  manager.isUndoingOrRedoing = false;
}

/**
 * Redo the last undone snapshot: restore text + foldedBlocks, and push current state into undoStack.
 */
function redo(manager, editor, foldingUtils, onChange) {
  if (!manager.redoStack.length) return;

  // Push current state into undoStack
  manager.undoStack.push({
    text: editor.value,
    foldedBlocks: JSON.parse(JSON.stringify(foldingUtils.getFoldedBlocksById())),
    cursorStart: editor.selectionStart,
    cursorEnd: editor.selectionEnd
  });

  // Pop the last redo snapshot and restore
  var next = manager.redoStack.pop();
  manager.isUndoingOrRedoing = true;
  editor.value = next.text;
  editor.selectionStart = next.cursorStart;
  editor.selectionEnd = next.cursorEnd;
  foldingUtils.updateFoldedBlocks(next.foldedBlocks);

  // Notify React state if provided
  if (typeof onChange === 'function') {
    onChange(function (prevState) {
      return _objectSpread(_objectSpread({}, prevState), {}, {
        undoStack: _toConsumableArray(manager.undoStack),
        redoStack: _toConsumableArray(manager.redoStack)
      });
    });
  }
  manager.isUndoingOrRedoing = false;
}

/**
 * Keydown handler for undo/redo shortcuts.
 */
// Keydown handler
export function handleUndoRedo(e, stateManager, editor, foldingUtils, onChange) {
  var mod = e.ctrlKey || e.metaKey;
  if (!mod) return;

  // Ctrl+Z / Cmd+Z without Shift => undo
  if (e.key === "z" && !e.shiftKey) {
    e.preventDefault();
    undo(stateManager, editor, foldingUtils, onChange);
  }
  // Ctrl+Y or Cmd+Shift+Z => redo
  else if (e.key === "y" || e.key === "z" && e.shiftKey) {
    e.preventDefault();
    redo(stateManager, editor, foldingUtils, onChange);
  }
}