planning

node_modules/react-router/modules/matchPath.js

@@ -0,0 +1,67 @@
+import pathToRegexp from "path-to-regexp";
+
+const cache = {};
+const cacheLimit = 10000;
+let cacheCount = 0;
+
+function compilePath(path, options) {
+  const cacheKey = `${options.end}${options.strict}${options.sensitive}`;
+  const pathCache = cache[cacheKey] || (cache[cacheKey] = {});
+
+  if (pathCache[path]) return pathCache[path];
+
+  const keys = [];
+  const regexp = pathToRegexp(path, keys, options);
+  const result = { regexp, keys };
+
+  if (cacheCount < cacheLimit) {
+    pathCache[path] = result;
+    cacheCount++;
+  }
+
+  return result;
+}
+
+/**
+ * Public API for matching a URL pathname to a path.
+ */
+function matchPath(pathname, options = {}) {
+  if (typeof options === "string" || Array.isArray(options)) {
+    options = { path: options };
+  }
+
+  const { path, exact = false, strict = false, sensitive = false } = options;
+
+  const paths = [].concat(path);
+
+  return paths.reduce((matched, path) => {
+    if (!path && path !== "") return null;
+    if (matched) return matched;
+
+    const { regexp, keys } = compilePath(path, {
+      end: exact,
+      strict,
+      sensitive
+    });
+    const match = regexp.exec(pathname);
+
+    if (!match) return null;
+
+    const [url, ...values] = match;
+    const isExact = pathname === url;
+
+    if (exact && !isExact) return null;
+
+    return {
+      path, // the path used to match
+      url: path === "/" && url === "" ? "/" : url, // the matched portion of the URL
+      isExact, // whether or not we matched exactly
+      params: keys.reduce((memo, key, index) => {
+        memo[key.name] = values[index];
+        return memo;
+      }, {})
+    };
+  }, null);
+}
+
+export default matchPath;