✨ : add comment support in HCL parser

src/main/antlr4/io/codeka/gaia/hcl/antlr/hcl.g4

@@ -105,6 +105,8 @@ NUMBER
    : '0' | [1-9] [0-9]*
    ;
 
-WS
-  : [ \t\r\n]+ -> skip
-  ; // skip spaces, tabs, newlines
+// comments and whitespaces
+COMMENT:      '/*' .*? '*/' -> skip;
+LINE_COMMENT: '//' ~[\r\n]* -> skip;
+HAS_COMMENT:  '#' ~ [\r\n]* -> skip;
+WS:           [ \t\r\n]+ -> skip; // skip spaces, tabs, newlines

src/test/resources/hcl/variables.tf

@@ -1,15 +1,20 @@
+// a full variable
 variable "string_var" {
     type = "string"
     description = "a test string var"
     default = "foo"
 }
 
+# another one
 variable "number_var" {
     description = "a test number var"
     type = number
     default = 42
 }
 
+/*
+ * A multi line comment
+ */
 variable "bool_var" {
     default = false
 }