case-insensitive-lexing: FIX javascript implementation does not work

doc/case-insensitive-lexing.md

@@ -75,4 +75,4 @@ Here are implementations of `CaseChangingCharStream` in various target languages
 * [C#](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingCharStream.cs)
 * [Go](https://github.com/antlr/antlr4/blob/master/doc/resources/case_changing_stream.go)
 * [Java](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingCharStream.java)
-* [JavaScript](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseInsensitiveInputStream.js)
+* [JavaScript](https://github.com/antlr/antlr4/blob/master/doc/resources/CaseChangingStream.js)

doc/resources/CaseChangingStream.js

@@ -0,0 +1,65 @@
+//
+/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
+ * Use of this file is governed by the BSD 3-clause license that
+ * can be found in the LICENSE.txt file in the project root.
+ */
+//
+
+function CaseChangingStream(stream, upper) {
+	this._stream = stream;
+	this._upper = upper;
+}
+
+CaseChangingStream.prototype.LA = function(offset) {
+	var c = this._stream.LA(offset);
+	if (c <= 0) {
+		return c;
+	}
+	return String.fromCodePoint(c)[this._upper ? "toUpperCase" : "toLowerCase"]().codePointAt(0);
+};
+
+CaseChangingStream.prototype.reset = function() {
+	return this._stream.reset();
+};
+
+CaseChangingStream.prototype.consume = function() {
+	return this._stream.consume();
+};
+
+CaseChangingStream.prototype.LT = function(offset) {
+	return this._stream.LT(offset);
+};
+
+CaseChangingStream.prototype.mark = function() {
+	return this._stream.mark();
+};
+
+CaseChangingStream.prototype.release = function(marker) {
+	return this._stream.release(marker);
+};
+
+CaseChangingStream.prototype.seek = function(_index) {
+	return this._stream.seek(_index);
+};
+
+CaseChangingStream.prototype.getText = function(start, stop) {
+	return this._stream.getText(start, stop);
+};
+
+CaseChangingStream.prototype.toString = function() {
+	return this._stream.toString();
+};
+
+Object.defineProperty(CaseChangingStream.prototype, "index", {
+	get: function() {
+		return this._stream.index;
+	}
+});
+
+Object.defineProperty(CaseChangingStream.prototype, "size", {
+	get: function() {
+		return this._stream.size;
+	}
+});
+
+exports.CaseChangingStream = CaseChangingStream;

doc/resources/CaseInsensitiveInputStream.js

@@ -1,54 +0,0 @@
-//
-/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
- * Use of this file is governed by the BSD 3-clause license that
- * can be found in the LICENSE.txt file in the project root.
- */
-//
-
-function CaseInsensitiveInputStream(stream, upper) {
-    this._stream = stream;
-    this._case = upper ? String.toUpperCase : String.toLowerCase;
-    return this;
-}
-
-CaseInsensitiveInputStream.prototype.LA = function (offset) {
-    c = this._stream.LA(i);
-    if (c <= 0) {
-        return c;
-    }
-    return this._case.call(String.fromCodePoint(c))
-};
-
-CaseInsensitiveInputStream.prototype.reset = function() {
-    return this._stream.reset();
-};
-
-CaseInsensitiveInputStream.prototype.consume = function() {
-    return this._stream.consume();
-};
-
-CaseInsensitiveInputStream.prototype.LT = function(offset) {
-    return this._stream.LT(offset);
-};
-
-CaseInsensitiveInputStream.prototype.mark = function() {
-    return this._stream.mark();
-};
-
-CaseInsensitiveInputStream.prototype.release = function(marker) {
-    return this._stream.release(marker);
-};
-
-CaseInsensitiveInputStream.prototype.seek = function(_index) {
-    return this._stream.getText(start, stop);
-};
-
-CaseInsensitiveInputStream.prototype.getText = function(start, stop) {
-    return this._stream.getText(start, stop);
-};
-
-CaseInsensitiveInputStream.prototype.toString = function() {
-    return this._stream.toString();
-};
-
-exports.CaseInsensitiveInputStream = CaseInsensitiveInputStream;