Replace parboiled with custom built version

Parboiled library was updated to work with asm 5 library: [1], [2].
Unfortunately this version wasn't released yet.

Since change If5009c676, Gerrit itself depends on asm 5.0.3.

Add a test to verify parboiled behaviour, and update to use a custom
built version of the latest master including support for asm 5.

[1] https://github.com/sirthias/parboiled/issues/76
[2] 41b3c1282b

Change-Id: I9cbc8e8f685aa87056f8beb17ab40104b4a129a1

gerrit-server/src/test/java/com/google/gerrit/server/util/ParboiledTest.java

@@ -0,0 +1,75 @@
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.util;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.parboiled.BaseParser;
+import org.parboiled.Parboiled;
+import org.parboiled.Rule;
+import org.parboiled.annotations.BuildParseTree;
+import org.parboiled.parserunners.ReportingParseRunner;
+import org.parboiled.support.ParseTreeUtils;
+import org.parboiled.support.ParsingResult;
+
+public class ParboiledTest {
+
+  private static final String EXPECTED =
+  "[Expression] '42'\n" +
+  "  [Term] '42'\n" +
+  "    [Factor] '42'\n" +
+  "      [Number] '42'\n" +
+  "        [0..9] '4'\n" +
+  "        [0..9] '2'\n" +
+  "    [ZeroOrMore]\n" +
+  "  [ZeroOrMore]\n";
+
+  private CalculatorParser parser;
+
+  @Before
+  public void setUp() {
+    parser = Parboiled.createParser(CalculatorParser.class);
+  }
+
+  @Test
+  public void test() {
+    ParsingResult<String> result =
+        new ReportingParseRunner<String>(parser.Expression()).run("42");
+    assertThat(result.hasErrors()).isFalse();
+    // next test is optional; we could stop here.
+    assertThat(ParseTreeUtils.printNodeTree(result)).isEqualTo(EXPECTED);
+  }
+
+  @BuildParseTree
+  static class CalculatorParser extends BaseParser<Object> {
+    Rule Expression() {
+      return Sequence(Term(), ZeroOrMore(AnyOf("+-"), Term()));
+    }
+
+    Rule Term() {
+      return Sequence(Factor(), ZeroOrMore(AnyOf("*/"), Factor()));
+    }
+
+    Rule Factor() {
+      return FirstOf(Number(), Sequence('(', Expression(), ')'));
+    }
+
+    Rule Number() {
+      return OneOrMore(CharRange('0', '9'));
+    }
+  }
+}