You can now write comments with a //

README.md

@@ -119,6 +119,14 @@ All variables are `float64` values.
 get("some-value") # => 123
 ```
 
+## Comments
+
+You can add single-line coments by prefixing a line with `//`.
+
+```jabl
+// This is a comment
+```
+
 # Interpreter
 
 The JABL interpreter is a simple program that reads a story and executes it. It is written in Go and can be run from the command line or compiled to WASM and invoked from Javascript.

internal/jabl/jabl.y

@@ -46,6 +46,7 @@ stmt:
       | IF '(' boolExpr ')' block             { $$ = &ifStmt{cond: $3, block: $5} }
       | IF '(' boolExpr ')' block ELSE block  { $$ = &ifStmt{cond: $3, block: $5, other: $7} }
       | SET '(' strExpr ',' numExpr ')'       { $$ = &fnStmt{fn: SET, expr: $3, expr2: $5} }
+      | '/' '/' STRING                        { $$ = &commentStmt{comment: $3} }
       ;
 
 strExpr:

internal/jabl/lexer.go

@@ -26,6 +26,10 @@ type seqStmt struct {
 	rest  stmt
 }
 
+type commentStmt struct {
+	comment string
+}
+
 type fnStmt struct {
 	fn    int
 	expr  expr

internal/jabl/testdata/examples/comments/code.jabl

@@ -0,0 +1,4 @@
+{
+    // print something good
+    print("Hello World")
+}

internal/jabl/testdata/examples/comments/result.json

@@ -0,0 +1,5 @@
+{
+  "output": "Hello World\n",
+  "choices": null,
+  "transition": ""
+}

internal/jabl/testdata/examples/comments/state_after.json

@@ -0,0 +1 @@
+{}

internal/jabl/testdata/examples/comments/state_before.json

@@ -0,0 +1 @@
+{}