(kind, element, attributeName) => {
const result = { value: null, checked: null, selected_options: [], bounding_box: null };
if (kind === 'url') { result.value = location.href; return result; }
if (!element) throw new Error('No element matches capture selector');
switch (kind) {
case 'input_value':
if (!['input', 'textarea', 'select'].includes(element.localName))
throw new Error('inputValue requires an input, textarea, or select');
result.value = element.value;
break;
case 'selected_options': {
if (element.localName === 'select') {
result.selected_options = Array.from(element.selectedOptions, o => ({ value: o.value, label: o.label, index: o.index }));
} else {
const role = element.getAttribute('role');
if (!['combobox', 'listbox'].includes(role)) throw new Error('selectedOptions requires a select, combobox, or listbox');
const root = element.getRootNode();
const ids = (element.getAttribute('aria-controls') || element.getAttribute('aria-owns') || '').split(/\s+/).filter(Boolean);
const containers = [element, ...ids.map(id => root.getElementById?.(id)).filter(Boolean)];
const options = [...new Set(containers.flatMap(c => Array.from(c.querySelectorAll('[role="option"]'))))];
result.selected_options = options.flatMap((o, index) => o.getAttribute('aria-selected') === 'true'
? [{ value: o.getAttribute('value') ?? o.textContent ?? '', label: o.getAttribute('aria-label') ?? o.textContent ?? '', index }]
: []);
}
break;
}
case 'selected_text':
if (!['input', 'textarea'].includes(element.localName)) throw new Error('selectedText requires an input or textarea');
if (element.selectionStart !== null && element.selectionEnd !== null)
result.value = element.value.slice(element.selectionStart, element.selectionEnd);
break;
case 'checked':
if (element.localName === 'input' && ['checkbox', 'radio'].includes(element.type)) result.checked = element.checked;
else if (['checkbox', 'radio', 'switch', 'menuitemcheckbox', 'menuitemradio'].includes(element.getAttribute('role'))) {
const checked = element.getAttribute('aria-checked');
if (!['true', 'false', 'mixed'].includes(checked)) throw new Error('Checked control has no valid aria-checked state');
result.checked = checked === 'true';
} else throw new Error('isChecked requires a checkbox, radio, or ARIA checked control');
break;
case 'attribute':
if (!attributeName) throw new Error('Attribute name must not be empty');
result.value = element.getAttribute(attributeName);
break;
case 'bounding_box': {
const style = getComputedStyle(element);
const box = element.getBoundingClientRect();
if (style.visibility !== 'hidden' && style.visibility !== 'collapse' && element.getClientRects().length && box.width > 0 && box.height > 0)
result.bounding_box = { x: box.x, y: box.y, width: box.width, height: box.height };
break;
}
default: throw new Error('Unknown capture kind: ' + kind);
}
return result;
}