AppleScript: Format selected text using unicode monospace glyph equivalents.

format-selected-text-to-unicode-monospace.jxa.js

#!/usr/bin/env osascript -l JavaScript

const $attr = Ref();
const $windows = Ref();
const $children = Ref();

const UNICODE_PATTERN = '11110xxx10xxxxxx10xxxxxx10xxxxxx';

function run(_) {
  const app = $.AXUIElementCreateApplication(
    $.NSWorkspace.sharedWorkspace.frontmostApplication.processIdentifier,
  );

  // Capture the focused UI element of the frontmost app.
  $.AXUIElementCopyAttributeValue(app, 'AXFocusedUIElement', $attr);
  const focusedElement = $attr[0].js;

  // Does the captured UI element have a selected text attribute?
  const $attributes = Ref();
  $.AXUIElementCopyAttributeNames(focusedElement, $attributes);
  if (!$attributes[0].js.some((attr) => attr.js == 'AXSelectedText')) {
    return;
  }

  // Capture the selected text string from the captured UI element.
  $.AXUIElementCopyAttributeValue(focusedElement, 'AXSelectedText', $attr);
  const selectedText = $attr[0].js;

  // Exit if no content in captured string.
  if (!selectedText) {
    return;
  }

  // Convert captured string to unicode monospace character equivalents.
  const monospaceText = selectedText
    .split('')
    .map((char) => {
      if (!char.match(/(\d|[a-z])/i)) {
        return char;
      }

      const offset = !!char.match(/\d/)
        ? 48 //  numeric
        : char.toLowerCase() == char
        ? 97 //  lowercase
        : 65; // uppercase

      let unicodeDecimal =
        char.charCodeAt(0) -
        offset +
        (120432 + (offset == 97 ? 26 : offset == 48 ? 390 : 0));

      let unicodeBinary = '';
      while (unicodeDecimal > 0) {
        unicodeBinary = `${parseInt(unicodeDecimal) % 2}${unicodeBinary}`;
        unicodeDecimal = parseInt(unicodeDecimal / 2);
      }

      let take = 0;
      const utf8Binary = UNICODE_PATTERN.split('')
        .reverse()
        .map((seg) => {
          if (seg == 'x') {
            if (take >= unicodeBinary.length) {
              return '0';
            }
            take++;
            return unicodeBinary[unicodeBinary.length - take];
          }
          return seg;
        });

      const utf8Decimal = utf8Binary
        .reverse()
        .join('')
        .split('')
        .reduce((acc, cur) => acc * 2 + parseInt(cur), 0);
      const utf8Percent = utf8Decimal
        .toString(16)
        .split(/(..)/g)
        .filter((byte) => !!byte)
        .map((byte) => `%${byte}`)
        .join('');

      return $.NSString.stringWithString(utf8Percent)
        .stringByRemovingPercentEncoding.js;
    })
    .join('');

  // Copy the monospaced text to the pasteboard.
  $.NSPasteboard.generalPasteboard.clearContents;
  $.NSPasteboard.generalPasteboard.writeObjects([monospaceText]);

  // Capture the frontmost app's menu bar.
  $.AXUIElementCopyAttributeValue(app, 'AXMenuBar', $attr);

  // Locate the "Edit" menu bar item.
  $.AXUIElementCopyAttributeValue($attr[0].js, 'AXChildren', $children);
  const editMenuBarItem = $children[0].js.find((child) => {
    $.AXUIElementCopyAttributeValue(child, 'AXTitle', $attr);
    return `${$attr[0].js}`.toLowerCase() == 'edit';
  });

  // Get the children of the first menu of the "Edit" menu bar item.
  $.AXUIElementCopyAttributeValue(editMenuBarItem, 'AXChildren', $children);
  $.AXUIElementCopyAttributeValue($children[0].js[0], 'AXChildren', $children);

  // Locate the "Paste" menu item by its identifier.
  let pasteMenuItem = $children[0].js.find((child) => {
    $.AXUIElementCopyAttributeValue(child, 'AXIdentifier', $attr);
    return `${$attr[0].js}` == 'paste' || `${$attr[0].js}` == 'paste:';
  });

  // Activate the "Paste" menu item if discovered.
  if (!!pasteMenuItem) {
    $.AXUIElementPerformAction(pasteMenuItem, 'AXPress');
    return;
  }

  // Fallback to System Events dispatch of pasteboard accelerator.
  Application('System Events').keystroke('v', { using: 'command down' });
}

// prettier-ignore
(() => {
ObjC.import('Cocoa'); // yes, it's necessary -- stop telling me it isn't

ObjC.bindFunction('AXUIElementPerformAction', ['int', ['id', 'id']]);
ObjC.bindFunction('AXValueCreate', ['id', ['unsigned int', 'void*']]);
ObjC.bindFunction('AXUIElementCopyAttributeNames', ['int', ['id', 'id*']]);
ObjC.bindFunction('AXUIElementCreateApplication', ['id', ['unsigned int']]);
ObjC.bindFunction('AXUIElementSetAttributeValue', ['int', ['id', 'id', 'id']]);
ObjC.bindFunction('AXUIElementCopyAttributeValue',['int', ['id', 'id', 'id*']]);
})();