import type { CheckResult, CheckStatus, EdmCheck } from "../types"; // Tags that must be explicitly closed in email HTML const CHECKED_TAGS = [ "html", "head", "body", "div", "span", "p", "center", "font", "table", "tbody", "thead", "tfoot", "tr", "td", "th", "a", "strong", "em", "b", "i", "u", "h1", "h2", "h3", "h4", "h5", "h6", "style", "title", ]; // Tags that are not supported / dangerous in email clients const BAD_EMAIL_TAGS = ["script", "form", "iframe", "object", "embed"]; export const htmlCheck: EdmCheck = { id: "html", label: "HTML check", description: "Basic structure: DOCTYPE, unclosed tags, and email-unsafe elements (script, form, iframe).", run: ({ htmlContent }): CheckResult => { let status: CheckStatus = "pass"; const messages: string[] = []; if (!htmlContent.trim()) { return { status: "warning", messages: ["No HTML content to validate."] }; } // DOCTYPE if (!/ declaration."); status = "warning"; } // Email-unsafe tags for (const tag of BAD_EMAIL_TAGS) { if (new RegExp(`<${tag}[\\s>/]`, "i").test(htmlContent)) { messages.push(`Found <${tag}> — not supported in email clients.`); if (status === "pass") status = "warning"; } } const lineAt = (index: number) => htmlContent.slice(0, index).split("\n").length; const unclosed: string[] = []; for (const tag of CHECKED_TAGS) { const re = new RegExp( `<\\s*(/?)\\s*${tag}(?:\\s[^>]*)?(?`, "gi", ); const openLines: number[] = []; const orphanCloseLines: number[] = []; let m: RegExpExecArray | null; while ((m = re.exec(htmlContent)) !== null) { if (m[1] === "/") { if (openLines.length) openLines.pop(); else orphanCloseLines.push(lineAt(m.index)); } else { openLines.push(lineAt(m.index)); } } for (const line of openLines) { unclosed.push(`<${tag}> not closed (line ${line})`); } for (const line of orphanCloseLines) { unclosed.push(` has no opening tag (line ${line})`); } } if (unclosed.length) { const shown = unclosed.slice(0, 6); const extra = unclosed.length - shown.length; messages.push( `Unclosed tags: ${shown.join("; ")}${extra > 0 ? ` + ${extra} more` : ""}.`, ); if (status === "pass") status = "warning"; } if (messages.length === 0) { messages.push("No HTML issues detected."); } return { status, messages }; }, };