Add parsing for ambient declarations

test/mjsunit/harmony/typesystem/ambient-declarations.js

Index: test/mjsunit/harmony/typesystem/ambient-declarations.js
diff --git a/test/mjsunit/harmony/typesystem/ambient-declarations.js b/test/mjsunit/harmony/typesystem/ambient-declarations.js
new file mode 100644
index 0000000000000000000000000000000000000000..47b3e63689c58ffa76c2850a102df7e9ec36b799
--- /dev/null
+++ b/test/mjsunit/harmony/typesystem/ambient-declarations.js
@@ -0,0 +1,229 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-types
+
+
+load("test/mjsunit/harmony/typesystem/testgen.js");
+
+
+function CheckValidAmbient(decl, full, preamble) {
+  preamble = typeof(preamble) === "undefined" ? '' : preamble + '; ';
+  CheckValid(preamble + "declare " + decl);
+  if (typeof(full) === "undefined") full = decl;
+  if (typeof(full) === "null") return;
+  CheckValid(preamble + "declare " + decl + "; " + full);
+}
+
+function CheckInvalidAmbient(decl, full=null, preamble) {
+  preamble = typeof(preamble) === "undefined" ? '' : preamble + '; ';
+  CheckInvalid(preamble + "declare " + decl);
+  if (typeof(full) === "undefined") full = decl;
+  if (typeof(full) === "null") return;
+  CheckInvalid(preamble + "declare " + decl + "; " + full);
+}
+
+function CheckInvalidAmbientInInnerScope(decl, full=null, preamble) {
+  preamble = typeof(preamble) === "undefined" ? '' : preamble + '; ';
+  CheckInvalid(preamble + "{ declare " + decl + "}");
+  CheckInvalid(preamble + "try { declare " + decl + "} catch (x) {}");
+  CheckInvalid(preamble + "function f() { declare " + decl + "}");
+  CheckInvalid(preamble + "for (declare " + decl + " of []) {} }");
+}
+
+
+function CheckAmbientVariableDeclarations(valid, invalid=valid) {
+  for (var key of ["var", "let", "const"]) {
+    if (key != "const") {
+      valid(key + " x");
+      valid(key + " x: number");
+      valid(key + " x, y");
+      valid(key + " x: number, y: string");
+    } else {
+      valid(key + " x", key + " x = 42");
+      valid(key + " x: number", key + " x: number = 42");
+      valid(key + " x, y", key + " x = 42, y = 'hello'");
+      valid(key + " x: number, y: string",
+            key + " x: number = 42, y: string = 'hello'");
+    }
+    valid(key + " [x, y]", key + " [x, y] = [42, 'hello']");
+    valid(key + " [x, y] : [number, string]",
+          key + " [x, y] : [number, string] = [42, 'hello']");
+    valid(key + " {a: x, b: y}",
+          key + " {a: x, b: y} = {a: 42, b: 'hello'}");
+    valid(key + " {a: x, b: y} : {a: number, b: string}",
+          key + " {a: x, b: y} : {a: number, b: string} = {a: 42, b: 'hello'}");
+    // Simple invalid declarations.
+    invalid(key + " x : ()");
+    // Initializers are not allowed in ambient variable declarations.
+    invalid(key + " x = 42");
+    invalid(key + " x: number = 42");
+    invalid(key + " x = 42, y = 'hello'");
+    invalid(key + " x: number = 42, y: string = 'hello'");
+  }
+}
+
+(function TestAmbientVariableDeclarations() {
+  CheckAmbientVariableDeclarations(CheckValidAmbient, CheckInvalidAmbient);
+  CheckAmbientVariableDeclarations(CheckInvalidAmbientInInnerScope);
+})();
+
+
+function CheckAmbientFunctionDeclarations(valid, invalid=valid) {
+  function check(decl) {
+    valid(decl, decl + "{}");
+    invalid(decl + "{}");  // Disallow bodies in ambient function declarations.
+  }
+  check("function f()");
+  check("function f() : number");
+  check("function f(x: number)");
+  check("function f(x: number) : number");
+  check("function f<A>()");
+  check("function f<A>() : A");
+  check("function f<A>(x: A)");
+  check("function f<A, B>(x: A) : B");
+  // We allow generators as well.
+  check("function* f()");
+  check("function* f() : number");
+  check("function* f(x: number)");
+  check("function* f(x: number) : number");
+  check("function* f<A>()");
+  check("function* f<A>() : A");
+  check("function* f<A>(x: A)");
+  check("function* f<A, B>(x: A) : B");
+  // Simple invalid declarations.
+  invalid("function f() : ()");
+  invalid("function f(x? = 42) : ()");
+  invalid("function f<>()");
+  // The function's name must be present.
+  invalid("function ()");
+  invalid("function () : number");
+  invalid("function (x: number)");
+  invalid("function (x: number) : number");
+  invalid("function <A>()");
+  invalid("function <A>() : A");
+  invalid("function <A>(x: A)");
+  invalid("function <A, B>(x: A) : B");
+}
+
+(function TestAmbientFunctionDeclarations() {
+  CheckAmbientFunctionDeclarations(CheckValidAmbient, CheckInvalidAmbient);
+  CheckAmbientFunctionDeclarations(CheckInvalidAmbientInInnerScope);
+})();
+
+
+function CheckAmbientClassDeclarations(valid, invalid=valid) {
+  function check(check_header) {
+    check_header("class C");
+    check_header("class C extends B", "class B {}");
+    check_header("class C implements I");
+    check_header("class C implements I, J");
+    check_header("class C extends B implements I", "class B {}");
+    check_header("class C extends B implements I, J", "class B {}");
+    check_header("class C<A, B>");
+    check_header("class C<A, B> extends D", "class D {}");
+    check_header("class C<A, B> implements I<A, B>");
+    check_header("class C<A, B> extends D implements I<A, B>", "class D {}");
+  }
+  function good(members) {
+    var ambient_body = "";
+    var body = "";
+    members.forEach(function([member, suffix='']) {
+      if (suffix != "") suffix = " " + suffix;
+      ambient_body += member + "; ";
+      body += member + suffix + "; ";
+    });
+    check(function (header, preamble) {
+      valid(header + " {" + ambient_body + "}",
+            header + " {" + body + "}", preamble);
+    });
+  }
+  function bad(member, suffix='') {
+    check(function (header, preamble) {
+      invalid(header + " {" + member + "}", null, preamble);
+      if (suffix != "") {
+        invalid(header + " {" + member + " " + suffix + "}", null, preamble);
+      }
+    });
+  }
+  // Test all possible valid members.
+  good([
+    // constructor
+    ["constructor (x: number, y: boolean)", "{ this.x = x; this.y = y; }"],
+    // variable members
+    ["x"],
+    ["y: boolean"],
+    ["'one': number"],
+    ["'2': boolean"],
+    ["3: string"],
+    // methods
+    ["f1 () : number", "{ return 42; }"],
+    ["f2 (a: number[]) : number", "{ return a[0]; }"],
+    ["f3 (a: number[], b: number) : number", "{ return b || a[0]; }"],
+    ["f4 <A, B>(a: A, b: B) : [A, B]", "{ return [a, b]; }"],
+    // index members
+    ["[x: string]"],
+    ["[x: string] : number"],
+    ["[x: number]"],
+    ["[x: number] : boolean"]
+  ]);
+  // Test all possible valid static members.
+  good([
+    // variable members
+    ["static x"],
+    ["static y: boolean"],
+    ["static 'one': number"],
+    ["static '2': boolean"],
+    ["static 3: string"],
+    // methods
+    ["static f1 () : number", "{ return 42; }"],
+    ["static f2 (a: number[]) : number", "{ return a[0]; }"],
+    ["static f3 (a: number[], b: number) : number", "{ return b || a[0]; }"],
+    ["static f4 <A, B>(a: A, b: B) : [A, B]", "{ return [a, b]; }"]
+  ]);
+  // Invalid constructors.
+  bad("constructor (a : number) : boolean", "{}"),
+  bad("constructor <A>(a : A)", "{}");
+  // Initializers in variable members are not allowed.
+  bad("x = 42"),
+  bad("x : number = 42"),
+  bad("'four': number = 4"),
+  bad("'5': boolean = false"),
+  bad("6: string[] = [...['six', 'six', 'and', 'six']]"),
+  // Getters and setters are not allowed, whether valid...
+  bad("get x ()", "{ return 42; }");
+  bad("get x () : number", "{ return 42; }");
+  bad("set x (a)", "{}");
+  bad("set x (a) : void", "{}");
+  bad("set x (a : number)", "{}");
+  bad("set x (a : number) : void", "{}");
+  // ... or invalid.
+  bad("get x (a)", "{ return 42; }");
+  bad("get x (a) : number", "{ return 42; }");
+  bad("get x (a, b)", "{ return 42; }");
+  bad("get x (a, b) : number", "{ return 42; }");
+  bad("get x (a : number)", "{ return 42; }");
+  bad("get x (a : number) : number", "{ return 42; }");
+  bad("get x <A>()", "{ return 42; }");
+  bad("set x ()", "{}");
+  bad("set x () : void", "{}");
+  bad("set x (a : number, b : number)", "{}");
+  bad("set x (a : number, b : number) : void", "{}");
+  bad("set x (...rest)", "{}");
+  bad("set x (...rest : string[]) : void", "{}");
+  bad("set x <A>(a : A)", "{}");
+}
+
+(function TestAmbientClassDeclarations() {
+  CheckAmbientClassDeclarations(CheckValidAmbient, CheckInvalidAmbient);
+  CheckAmbientClassDeclarations(CheckInvalidAmbientInInnerScope);
+})();
+
+(function TestMoreInvalidAmbients() {
+  CheckInvalidAmbient("type N = number");
+  CheckInvalidAmbient("interface I {}");
+  CheckInvalidAmbient("x = 42");
+  CheckInvalidAmbient("{}");
+  CheckInvalidAmbient("while (true) {}");
+})();