Implement functions, arrays, maps, and while loops. Document and clean up code.

lexer.go

@@ -1,3 +1,17 @@
+/*
+	Copyright (c) 2021 Arsen Musayelyan
+
+	Permission is hereby granted, free of charge, to any person obtaining a copy
+	of this software and associated documentation files (the "Software"), to deal
+	in the Software without restriction, including without limitation the rights
+	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+	copies of the Software, and to permit persons to whom the Software is
+	furnished to do so, subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be included in all
+	copies or substantial portions of the Software.
+*/
+
 package scpt
 
 import (
@@ -7,10 +21,10 @@ import (
 
 // Create custom stateful regex lexer
 var scptLexer = lexer.Must(stateful.NewSimple([]stateful.Rule{
-	{"Ident", `[a-zA-Z]\w*`, nil},
+	{"Ident", `[a-zA-Z_]\w*`, nil},
 	{"String", `"[^"]*"`, nil},
 	{"Number", `(?:\d*\.)?\d+`, nil},
-	{"Punct", `[-[!@$&()_{}\|:;"',.?/]|]`, nil},
+	{"Punct", `[-[!@$&(){}\|:;"',.?/]|]`, nil},
 	{"Whitespace", `[ \t\r\n]+`, nil},
 	{"Comment", `(###(.|\n)+###|#[^\n]+)`, nil},
 	{"Operator", `(>=|<=|>|<|==|!=)|[-+*/^%]`, nil},