Add support for meta-properties.

estree/estree#32

src/expression.js

@@ -382,7 +382,14 @@ const empty = []
 
 pp.parseNew = function() {
   let node = this.startNode()
-  this.next()
+  let meta = this.parseIdent(true)
+  if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
+    node.meta = meta
+    node.property = this.parseIdent(true)
+    if (node.property.name !== "target")
+      this.raise(node.property.start, "The only valid meta property for new is new.target")
+    return this.finishNode(node, "MetaProperty")
+  }
   let start = this.markPosition()
   node.callee = this.parseSubscripts(this.parseExprAtom(), start, true)
   if (this.eat(tt.parenL)) node.arguments = this.parseExprList(tt.parenR, false)

src/loose/expression.js

@@ -269,7 +269,12 @@ lp.parseExprAtom = function() {
 
 lp.parseNew = function() {
   let node = this.startNode(), startIndent = this.curIndent, line = this.curLineStart
-  this.next()
+  let meta = this.parseIdent(true)
+  if (this.options.ecmaVersion >= 6 && this.eat(tt.dot)) {
+    node.meta = meta
+    node.property = this.parseIdent(true)
+    return this.finishNode(node, "MetaProperty")
+  }
   let start = this.storeCurrentPos()
   node.callee = this.parseSubscripts(this.parseExprAtom(), start, true, startIndent, line)
   if (this.tok.type == tt.parenL) {

test/tests-harmony.js

@@ -15579,3 +15579,18 @@ testFail("'use strict'; ({eval = defValue} = obj)", "Assigning to eval in strict
 testFail("[...eval] = arr", "Assigning to eval in strict mode (1:4)", {ecmaVersion: 6, sourceType: "module"});
 
 testFail("function* y({yield}) {}", "Binding yield (1:13)", {ecmaVersion: 6});
+
+test("new.target", {
+  type: "Program",
+  body: [{
+    type: "ExpressionStatement",
+    expression: {
+      type: "MetaProperty",
+      meta: {type: "Identifier", name: "new"},
+      property: {type: "Identifier", name: "target"}
+    }
+  }],
+  sourceType: "script"
+}, {ecmaVersion: 6});
+
+testFail("new.prop", "The only valid meta property for new is new.target (1:4)", {ecmaVersion: 6});