Parse BigInt literals (#93)

Author: robertrossmann

corpus/literals.txt

@@ -4,10 +4,12 @@ Numbers
 
 04000
 400
+100n
 
 ---
 
 (program
+  (expression_statement (number))
   (expression_statement (number))
   (expression_statement (number)))
 

grammar.js

@@ -819,6 +819,8 @@ module.exports = grammar({
 
       const octal_literal = seq(choice('0o', '0O'), /[0-7]+/)
 
+      const bigint_literal = seq(decimal_digits, 'n')
+
       const decimal_integer_literal = choice(
         '0',
         seq(optional('0'), /[1-9]/, optional(decimal_digits))
@@ -834,7 +836,8 @@ module.exports = grammar({
         hex_literal,
         decimal_literal,
         binary_literal,
-        octal_literal
+        octal_literal,
+        bigint_literal,
       ))
     },
 

src/grammar.json

@@ -4193,6 +4193,19 @@
                 "value": "[0-7]+"
               }
             ]
+          },
+          {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "PATTERN",
+                "value": "\\d+"
+              },
+              {
+                "type": "STRING",
+                "value": "n"
+              }
+            ]
           }
         ]
       }