Function getExpandedContext

scripts/content.js:561–596

* 获取扩展上下文（向上遍历多层）

(element)

 * 获取扩展上下文（向上遍历多层）
 */
function getExpandedContext(element) {
    const contextParts = [];
    let current = element.parentElement;
    let depth = 0;
    const maxDepth = 4;

    while (current && depth < maxDepth) {
        // 检查是否有有意义的语义信息
        const tagName = current.tagName.toLowerCase();

        // 跳过无意义的容器
        if (['body', 'html', 'main', 'article', 'section'].includes(tagName)) {
            break;
        }

        // 检查类名和 ID 中的语义
        const semantic = extractSemanticFromElement(current);
        if (semantic) {
            contextParts.push(semantic);
        }

        // 检查 heading 元素
        const heading = current.querySelector('h1, h2, h3, h4, h5, h6, legend');
        if (heading && !contextParts.includes(heading.innerText.trim())) {
            const headingText = heading.innerText.trim();
            if (headingText.length < 100) {
                contextParts.push(`[section: ${headingText}]`);
            }
        }

        current = current.parentElement;
        depth++;
    }

    return contextParts.join(' | ').substring(0, 300);
}

/**
 * 从元素中提取语义信息（class, id, data-* 属性）