engine.js

// engine.js

const cheerio = require("cheerio");
const rules = require("./rules");
const { extractStyleBlocks, parseCssRules } = require("./utils");

function parseInlineStylesFromCheerio($) {
  const out = [];
  $("[style]").each((i, el) => {
    const styleAttr = $(el).attr("style") || "";
    const decls = styleAttr.split(";").filter(Boolean);
    const selectorLabel = `<${el.tagName}${el.attribs.class ? "." + el.attribs.class.split(" ")[0] : ""}>`;
    for (const decl of decls) {
      const [prop, ...rest] = decl.split(":");
      if (!prop || rest.length === 0) continue;
      out.push({
        selector: selectorLabel,
        property: prop.trim().toLowerCase(),
        value: rest.join(":").trim().toLowerCase(),
      });
    }
  });
  return out;
}

function runDetector(html) {
  const $ = cheerio.load(html);
  const cssText = extractStyleBlocks($);
  const cssRules = parseCssRules(cssText);
  const inlineRules = parseInlineStylesFromCheerio($);
  const allText = $("body").text();

  const ctx = { $, cssRules, inlineRules, allText };

  const results = [];
  for (const rule of rules) {
    let findings;
    try {
      findings = rule.check(ctx);
    } catch (e) {
      findings = []; 
    }
    if (findings === null) {
      
      results.push({ id: rule.id, category: rule.category, type: rule.type, status: "skipped", findings: [] });
    } else if (findings.length > 0) {
      results.push({ id: rule.id, category: rule.category, type: rule.type, status: "flagged", findings });
    } else {
      results.push({ id: rule.id, category: rule.category, type: rule.type, status: "clean", findings: [] });
    }
  }
  return results;
}

module.exports = { runDetector };