Add support for Cool

This change includes a brief (non-sensical) sample program I wrote to
illustrate many of Cool's language constructs, as well as a simple rule
to distinguish Cool files from Common Lisp or OpenCL (it has a line that
starts with the word 'class'). Further, it includes a second example
program adapted from an example contained in the Cool distribution
(list.cl), which contains a few further language constructs and captures
the style of a Cool program.

lib/linguist/heuristics.rb

@@ -25,7 +25,7 @@ module Linguist
         if languages.all? { |l| ["TypeScript", "XML"].include?(l) }
           disambiguate_ts(data, languages)
         end
-        if languages.all? { |l| ["Common Lisp", "OpenCL"].include?(l) }
+        if languages.all? { |l| ["Common Lisp", "Cool", "OpenCL"].include?(l) }
           disambiguate_cl(data, languages)
         end
         if languages.all? { |l| ["Rebol", "R"].include?(l) }
@@ -72,6 +72,7 @@ module Linguist
     def self.disambiguate_cl(data, languages)
       matches = []
       matches << Language["Common Lisp"] if data.include?("(defun ")
+      matches << Language["Cool"] if /^class/x.match(data)
       matches << Language["OpenCL"] if /\/\* |\/\/ |^\}/.match(data)
       matches
     end

lib/linguist/languages.yml

@@ -429,6 +429,12 @@ Common Lisp:
   - clisp
   - ecl
 
+Cool:
+  type: programming
+  lexer: Text only
+  extensions:
+  - .cl
+
 Coq:
   type: programming
   extensions:

lib/linguist/samples.json

@@ -91,6 +91,9 @@
       ".cl",
       ".lisp"
     ],
+    "Cool": [
+      ".cl"
+    ],
     "Coq": [
       ".v"
     ],
@@ -702,8 +705,8 @@
       ".gemrc"
     ]
   },
-  "tokens_total": 607168,
-  "languages_total": 739,
+  "tokens_total": 607535,
+  "languages_total": 741,
   "tokens": {
     "ABAP": {
       "*/**": 1,
@@ -15134,6 +15137,96 @@
       "line": 2,
       "After": 1
     },
+    "Cool": {
+      "class": 7,
+      "List": 8,
+      "{": 27,
+      "isNil": 2,
+      "(": 30,
+      ")": 30,
+      "Bool": 5,
+      "true": 2,
+      "}": 27,
+      ";": 40,
+      "head": 2,
+      "Int": 15,
+      "abort": 2,
+      "tail": 2,
+      "self": 3,
+      "cons": 1,
+      "i": 7,
+      "new": 3,
+      "Cons": 2,
+      ".init": 1,
+      "inherits": 4,
+      "car": 3,
+      "-": 19,
+      "The": 2,
+      "element": 1,
+      "in": 3,
+      "this": 1,
+      "list": 2,
+      "cell": 1,
+      "cdr": 3,
+      "rest": 3,
+      "of": 2,
+      "the": 1,
+      "false": 3,
+      "init": 1,
+      "<": 9,
+      "Exhibit": 1,
+      "various": 1,
+      "language": 1,
+      "constructs": 1,
+      "Sample": 5,
+      "testCondition": 1,
+      "x": 3,
+      "if": 3,
+      "then": 3,
+      "else": 3,
+      "+": 1,
+      "*": 3,
+      "fi": 2,
+      "testLoop": 1,
+      "y": 7,
+      "while": 1,
+      "loop": 1,
+      "not": 1,
+      "condition": 1,
+      "/": 2,
+      "pool": 1,
+      "testAssign": 1,
+      "z": 2,
+      "testCase": 1,
+      "var": 2,
+      "SELF_TYPE": 2,
+      "io": 1,
+      "IO": 3,
+      "<->": 1,
+      "case": 1,
+      "a": 4,
+      "A": 3,
+      "io.out_string": 4,
+      "b": 3,
+      "B": 2,
+      "s": 1,
+      "o": 1,
+      "Object": 1,
+      "esac": 1,
+      "testLet": 1,
+      "let": 2,
+      "c": 2,
+      "Used": 1,
+      "to": 1,
+      "test": 1,
+      "subclasses": 1,
+      "C": 1,
+      "main": 2,
+      ".testLet": 1,
+      "example": 1,
+      "Main": 1,
+      "out_string": 1
+    },
     "Coq": {
       "Inductive": 41,
       "day": 9,
@@ -65508,6 +65601,7 @@
     "COBOL": 90,
     "CoffeeScript": 2951,
     "Common Lisp": 2186,
+    "Cool": 367,
     "Coq": 18259,
     "Creole": 134,
     "Crystal": 1506,
@@ -65689,6 +65783,7 @@
     "COBOL": 4,
     "CoffeeScript": 9,
     "Common Lisp": 3,
+    "Cool": 2,
     "Coq": 12,
     "Creole": 1,
     "Crystal": 3,
@@ -65845,5 +65940,5 @@
     "YAML": 2,
     "Zephir": 2
   },
-  "md5": "dfced8ef9ddd9813d2982dc25a5468fa"
+  "md5": "ee1f12dec040474f3864dfc0af301d17"
 }

samples/Cool/list.cl

@@ -0,0 +1,26 @@
+(* This simple example of a list class is adapted from an example in the
+   Cool distribution. *)
+
+class List {
+   isNil() : Bool { true };
+   head()  : Int { { abort(); 0; } };
+   tail()  : List { { abort(); self; } };
+   cons(i : Int) : List {
+      (new Cons).init(i, self)
+   };
+};
+
+class Cons inherits List {
+   car : Int;	-- The element in this list cell
+   cdr : List;	-- The rest of the list
+   isNil() : Bool { false };
+   head()  : Int { car };
+   tail()  : List { cdr };
+   init(i : Int, rest : List) : List {
+      {
+	 car <- i;
+	 cdr <- rest;
+	 self;
+      }
+   };
+};

samples/Cool/sample.cl

@@ -0,0 +1,71 @@
+(* Refer to Alex Aiken, "The Cool Reference Manual":
+    http://theory.stanford.edu/~aiken/software/cool/cool-manual.pdf
+   for language specification.
+*)
+
+-- Exhibit various language constructs
+class Sample {
+    testCondition(x: Int): Bool {
+        if x = 0
+        then false
+        else
+            if x < (1 + 2) * 3
+            then true
+            else false
+            fi
+        fi
+    };
+
+    testLoop(y: Int): Bool {
+        while y > 0 loop
+        {
+            if not condition(y)
+            then y <- y / 2
+            else y <- y - 1;
+        }
+        pool
+    };
+
+    testAssign(z: Int): Bool {
+        i : Int;
+        i <- ~z;
+    };
+
+    testCase(var: Sample): SELF_TYPE {
+        io : IO <- new IO;
+        case var of
+            a : A => io.out_string("Class type is A\n");
+            b : B => io.out_string("Class type is B\n");
+            s : Sample => io.out_string("Class type is Sample\n");
+            o : Object => io.out_string("Class type is object\n");
+        esac
+    };
+
+    testLet(i: Int): Int {
+        let (a: Int in
+            let(b: Int <- 3, c: Int <- 4 in
+                {
+                    a <- 2;
+                    a * b * 2 / c;
+                }
+            )
+        )
+    };
+};
+
+-- Used to test subclasses
+class A inherits Sample {};
+class B inherits A {};
+
+class C {
+    main() : Int {
+        (new Sample).testLet(1)
+    };
+};
+
+-- "Hello, world" example
+class Main inherits IO {
+    main(): SELF_TYPE {
+        out_string("Hello, World.\n")
+    };
+};