Fix #5103: Add support for BigInt literals (#5104)

* Fix #5103: Add support for BigInt literals

* Fix typos found in testing

* Support binary, octal and hex BigInt literals

* Make decimal BigInt test consistent other bases

* Correct test BigInt test names

* Add Node versions to CI

Author: rdeforest

.travis.yml

@@ -4,6 +4,8 @@ node_js:
   - 6
   - 8
   - 10
+  - 12
+  - node # Latest
 
 cache:
   directories:

Cakefile

@@ -472,6 +472,7 @@ runTests = (CoffeeScript) ->
   skipUnless 'var a = 2 ** 2; a **= 3', ['exponentiation.coffee']
   skipUnless 'var {...a} = {}', ['object_rest_spread.coffee']
   skipUnless '/foo.bar/s.test("foo\tbar")', ['regex_dotall.coffee']
+  skipUnless '1n', ['numbers_bigint.coffee']
   files = fs.readdirSync('test').filter (filename) ->
     filename not in testFilesToSkip
 

appveyor.yml

@@ -3,7 +3,8 @@ environment:
     - nodejs_version: '6'
     - nodejs_version: '8'
     - nodejs_version: '10'
-    - nodejs_version: '' # Installs latest.
+    - nodejs_version: '12'
+    - nodejs_version: '' # Latest
 
 install:
   - ps: Install-Product node $env:nodejs_version

lib/coffeescript/lexer.js

@@ -1212,9 +1212,10 @@ CSX_ATTRIBUTE = /// ^
 ///
 
 NUMBER     = ///
-  ^ 0b[01]+    |              # binary
-  ^ 0o[0-7]+   |              # octal
-  ^ 0x[\da-f]+ |              # hex
+  ^ 0b[01]+n?    |            # binary
+  ^ 0o[0-7]+n?   |            # octal
+  ^ 0x[\da-f]+n? |            # hex
+  ^ \d+n         |            # decimal bigint
   ^ \d*\.?\d+ (?:e[+-]?\d+)?  # decimal
 ///i
 

lib/coffeescript/parser.js

@@ -0,0 +1,17 @@
+# BigInt Literals
+# ---------------
+
+test "BigInt exists", ->
+  'object' is typeof BigInt
+
+test "Parser recognizes decimal BigInt literals", ->
+  eq 42n, BigInt 42
+
+test "Parser recognizes binary BigInt literals", ->
+  eq 42n, 0b101010n
+
+test "Parser recognizes octal BigInt literals", ->
+  eq 42n, 0o52n
+
+test "Parser recognizes hexadecimal BigInt literals", ->
+  eq 42n, 0x2an