Add URL implementation (#1359)

1 files changed, 261 insertions, 0 deletions

diff --git a/js/url.ts b/js/url.ts
new file mode 100644
index 000000000..42a2577e1
--- /dev/null
+++ b/js/url.ts
@@ -0,0 +1,261 @@
+// Copyright 2018 the Deno authors. All rights reserved. MIT license.
+import * as urlSearchParams from "./url_search_params";
+
+interface URLParts {
+  protocol: string;
+  username: string;
+  password: string;
+  hostname: string;
+  port: string;
+  path: string;
+  query: string;
+  hash: string;
+}
+
+const patterns = {
+  protocol: "(?:([^:/?#]+):)",
+  authority: "(?://([^/?#]*))",
+  path: "([^?#]*)",
+  query: "(\\?[^#]*)",
+  hash: "(#.*)",
+
+  authentication: "(?:([^:]*)(?::([^@]*))?@)",
+  hostname: "([^:]+)",
+  port: "(?::(\\d+))"
+};
+
+const urlRegExp = new RegExp(
+  `^${patterns.protocol}?${patterns.authority}?${patterns.path}${
+    patterns.query
+  }?${patterns.hash}?`
+);
+
+const authorityRegExp = new RegExp(
+  `^${patterns.authentication}?${patterns.hostname}${patterns.port}?$`
+);
+
+const searchParamsMethods: Array<keyof urlSearchParams.URLSearchParams> = [
+  "append",
+  "delete",
+  "set"
+];
+
+function parse(url: string): URLParts | undefined {
+  const urlMatch = urlRegExp.exec(url);
+  if (urlMatch) {
+    const [, , authority] = urlMatch;
+    const authorityMatch = authority
+      ? authorityRegExp.exec(authority)
+      : [null, null, null, null, null];
+    if (authorityMatch) {
+      return {
+        protocol: urlMatch[1] || "",
+        username: authorityMatch[1] || "",
+        password: authorityMatch[2] || "",
+        hostname: authorityMatch[3] || "",
+        port: authorityMatch[4] || "",
+        path: urlMatch[3] || "",
+        query: urlMatch[4] || "",
+        hash: urlMatch[5] || ""
+      };
+    }
+  }
+  return undefined;
+}
+
+export class URL {
+  private _parts: URLParts;
+  private _searchParams!: urlSearchParams.URLSearchParams;
+
+  private _updateSearchParams() {
+    const searchParams = new urlSearchParams.URLSearchParams(this.search);
+
+    for (const methodName of searchParamsMethods) {
+      // tslint:disable:no-any
+      const method: (...args: any[]) => any = searchParams[methodName];
+      searchParams[methodName] = (...args: any[]) => {
+        method.apply(searchParams, args);
+        this.search = searchParams.toString();
+      };
+      // tslint:enable
+    }
+    this._searchParams = searchParams;
+  }
+
+  get hash(): string {
+    return this._parts.hash;
+  }
+
+  set hash(value: string) {
+    value = unescape(String(value));
+    if (!value) {
+      this._parts.hash = "";
+    } else {
+      if (value.charAt(0) !== "#") {
+        value = `#${value}`;
+      }
+      // hashes can contain % and # unescaped
+      this._parts.hash = escape(value)
+        .replace(/%25/g, "%")
+        .replace(/%23/g, "#");
+    }
+  }
+
+  get host(): string {
+    return `${this.hostname}${this.port ? `:${this.port}` : ""}`;
+  }
+
+  set host(value: string) {
+    value = String(value);
+    const url = new URL(`http://${value}`);
+    this._parts.hostname = url.hostname;
+    this._parts.port = url.port;
+  }
+
+  get hostname(): string {
+    return this._parts.hostname;
+  }
+
+  set hostname(value: string) {
+    value = String(value);
+    this._parts.hostname = encodeURIComponent(value);
+  }
+
+  get href(): string {
+    const authentication =
+      this.username || this.password
+        ? `${this.username}${this.password ? ":" + this.password : ""}@`
+        : "";
+
+    return `${this.protocol}//${authentication}${this.host}${this.pathname}${
+      this.search
+    }${this.hash}`;
+  }
+
+  set href(value: string) {
+    value = String(value);
+    if (value !== this.href) {
+      const url = new URL(value);
+      this._parts = { ...url._parts };
+      this._updateSearchParams();
+    }
+  }
+
+  get origin(): string {
+    return `${this.protocol}//${this.host}`;
+  }
+
+  get password(): string {
+    return this._parts.password;
+  }
+
+  set password(value: string) {
+    value = String(value);
+    this._parts.password = encodeURIComponent(value);
+  }
+
+  get pathname(): string {
+    return this._parts.path ? this._parts.path : "/";
+  }
+
+  set pathname(value: string) {
+    value = unescape(String(value));
+    if (!value || value.charAt(0) !== "/") {
+      value = `/${value}`;
+    }
+    // paths can contain % unescaped
+    this._parts.path = escape(value).replace(/%25/g, "%");
+  }
+
+  get port(): string {
+    return this._parts.port;
+  }
+
+  set port(value: string) {
+    const port = parseInt(String(value), 10);
+    this._parts.port = isNaN(port)
+      ? ""
+      : Math.max(0, port % 2 ** 16).toString();
+  }
+
+  get protocol(): string {
+    return `${this._parts.protocol}:`;
+  }
+
+  set protocol(value: string) {
+    value = String(value);
+    if (value) {
+      if (value.charAt(value.length - 1) === ":") {
+        value = value.slice(0, -1);
+      }
+      this._parts.protocol = encodeURIComponent(value);
+    }
+  }
+
+  get search(): string {
+    return this._parts.query;
+  }
+
+  set search(value: string) {
+    value = String(value);
+    if (value.charAt(0) !== "?") {
+      value = `?${value}`;
+    }
+    this._parts.query = value;
+    this._updateSearchParams();
+  }
+
+  get username(): string {
+    return this._parts.username;
+  }
+
+  set username(value: string) {
+    value = String(value);
+    this._parts.username = encodeURIComponent(value);
+  }
+
+  get searchParams(): urlSearchParams.URLSearchParams {
+    return this._searchParams;
+  }
+
+  constructor(url: string, base?: string | URL) {
+    let baseParts: URLParts | undefined;
+    if (base) {
+      baseParts = typeof base === "string" ? parse(base) : base._parts;
+      if (!baseParts) {
+        throw new TypeError("Invalid base URL.");
+      }
+    }
+
+    const urlParts = parse(url);
+    if (!urlParts) {
+      throw new TypeError("Invalid URL.");
+    }
+
+    if (urlParts.protocol) {
+      this._parts = urlParts;
+    } else if (baseParts) {
+      this._parts = {
+        protocol: baseParts.protocol,
+        username: baseParts.username,
+        password: baseParts.password,
+        hostname: baseParts.hostname,
+        port: baseParts.port,
+        path: urlParts.path || baseParts.path,
+        query: urlParts.query || baseParts.query,
+        hash: urlParts.hash
+      };
+    } else {
+      throw new TypeError("URL requires a base URL.");
+    }
+    this._updateSearchParams();
+  }
+
+  toString(): string {
+    return this.href;
+  }
+
+  toJSON(): string {
+    return this.href;
+  }
+}