Function extractContentWithFormulas

scripts/injectGptButton.js:165–597

* Extract content from ChatGPT message with proper formula conversion * Converts KaTeX formulas to standard Markdown format

(container)

     * Converts KaTeX formulas to standard Markdown format
     */
    function extractContentWithFormulas(container) {
        const markdownDivs = container.querySelectorAll('.markdown');
        if (markdownDivs.length === 0) return '';

        let result = '';

        const getCodeBlockText = (codeNode) => {
            let text = '';

            const appendNodeText = (currentNode) => {
                if (currentNode.nodeType === Node.TEXT_NODE) {
                    text += currentNode.textContent;
                    return;
                }

                if (currentNode.nodeType !== Node.ELEMENT_NODE) {
                    return;
                }

                if (currentNode.tagName === 'BR') {
                    text += '\n';
                    return;
                }

                currentNode.childNodes.forEach(appendNodeText);
            };

            codeNode.childNodes.forEach(appendNodeText);
            return text.replace(/\n$/, '');
        };

        const normalizeCodeLanguage = (language) => {
            const normalized = (language || '').trim().toLowerCase();
            const aliases = {
                'c++': 'cpp',
                'c#': 'csharp',
                'js': 'javascript',
                'ts': 'typescript',
                'shell': 'bash',
                'zsh': 'bash',
            };

            if (aliases[normalized]) return aliases[normalized];
            return /^[a-z0-9_+-]+$/.test(normalized) ? normalized : '';
        };

        const getCodeBlockLanguage = (preNode, codeNode) => {
            const classLanguage = codeNode.className.match(/language-([a-zA-Z0-9_+-]+)/)?.[1];
            if (classLanguage) {
                return normalizeCodeLanguage(classLanguage);
            }

            const labels = Array.from(preNode.querySelectorAll('div'))
                .filter(element => !element.contains(codeNode))
                .map(element => element.textContent?.trim() || '')
                .filter(text => text && text.length <= 30 && !/复制|copy/i.test(text));

            for (const label of labels) {