Add Treetop Support - https://cjheath.github.io/treetop/ (#571)

A DSL that integrates with Ruby for expressing a PEG (parsing expression
grammer). The tool uses itself to define the language so if you really want
the full details on the language it is at:

https://github.com/cjheath/treetop/blob/master/lib/treetop/compiler/metagrammar.treetop

But the cliff notes are:

* Very Ruby-like
* Only supports single-line comments
* Embeds proper Ruby code so I just copy/pasted the complexitychecks from the
  Ruby language specs.

To make this commit I just:

1. Added it to the `languages.json` file (per README)
2. Ran `go generate` (per README)
3. Ran `./test-all.sh`. This confirmed all green and updated `LANGAUGES.md` and
   `SCC-OUTPUT-REPORT.html` (maybe this step should be added to README?)

I also ran `go build` to create the binary and tested it against my project
which has many Treetop files and confirmed it worked.

LANGUAGES.md

@@ -288,6 +288,7 @@ Textile (textile)
 Thrift (thrift)
 TL (tl)
 TOML (toml)
+Treetop (treetop,tt)
 TTCN-3 (ttcn,ttcn3,ttcnpp)
 Twig Template (twig)
 TypeScript (ts,tsx)

SCC-OUTPUT-REPORT.html

@@ -18,7 +18,7 @@
 		<th>447</th>
 		<th>7678</th>
 		<th>1413</th>
-		<th>256040</th>
+		<th>256080</th>
 		<th>4138</th>
 	</tr><tr>
 		<td>processor/workers_test.go</td>
@@ -240,16 +240,6 @@
 		<td>0</td>
 		<td>2209</td>
 		<td>35</td>
-	</tr><tr>
-		<td>processor/bloom.go</td>
-		<td></td>
-		<td>37</td>
-		<td>7</td>
-		<td>12</td>
-		<td>18</td>
-		<td>2</td>
-		<td>1062</td>
-		<td>29</td>
 	</tr><tr>
 		<td>processor/cocomo_test.go</td>
 		<td></td>
@@ -260,6 +250,16 @@
 		<td>6</td>
 		<td>686</td>
 		<td>23</td>
+	</tr><tr>
+		<td>processor/bloom.go</td>
+		<td></td>
+		<td>37</td>
+		<td>7</td>
+		<td>12</td>
+		<td>18</td>
+		<td>2</td>
+		<td>1062</td>
+		<td>29</td>
 	</tr><tr>
 		<td>processor/helpers_test.go</td>
 		<td></td>
@@ -288,7 +288,7 @@
 		<td>1</td>
 		<td>4</td>
 		<td>0</td>
-		<td>23199</td>
+		<td>23239</td>
 		<td>6</td>
 	</tr></tbody>
 	<tfoot><tr>
@@ -299,7 +299,7 @@
 		<th>447</th>
 		<th>7678</th>
 		<th>1413</th>
-		<th>256040</th>
+		<th>256080</th>
 		<th>4138</th>
 	</tr>
 	<tr>

languages.json

@@ -6520,6 +6520,33 @@
       }
     ]
   },
+  "Treetop": {
+    "complexitychecks": [
+      "for ",
+      "for(",
+      "if ",
+      "if(",
+      "switch ",
+      "while ",
+      "else ",
+      "|| ",
+      "&& ",
+      "!= ",
+      "== "
+    ],
+    "extensions": ["treetop", "tt"],
+    "line_comment": ["#"],
+    "quotes": [
+      {
+        "end": "\"",
+        "start": "\""
+      },
+      {
+        "end": "'",
+        "start": "'"
+      }
+    ]
+  },
   "Twig Template": {
     "complexitychecks": ["{% for ", "{% if ", "{% else ", "{% elseif "],
     "extensions": ["twig"],