Add basic var tokens

specs/VARIABLES.md

@@ -0,0 +1,24 @@
+# Variables
+Variables can be defined in the global scope, in structs and classes, and in functions.
+
+## Global variables
+Global variables can be defined as such:
+
+```c2
+// Defines a global variable called my_var.
+int32 my_var;
+
+// Defines a const variable.
+const int32 my_var;
+
+// Defines a global variable whose type is determined automatically.
+// The value will be determined at runtime.
+var my_var = 123;
+
+// Defines a const variable whose type is determined automatically.
+const my_var = 123;
+
+// Defines a global variable whose initial value is computed at compile-time.
+// If it cannot be computed at compile-time, an error is thrown.
+static my_var = 123;
+```

v0/token.c

@@ -31,6 +31,10 @@ static const KeywordMap keywords[] = {
 	{"import", TOKEN_IMPORT},
     {"alias", TOKEN_ALIAS},
     {"public", TOKEN_PUBLIC},
+	{"var", TOKEN_VAR},
+	{"const", TOKEN_CONST},
+	{"static", TOKEN_STATIC},
+
 	{"void", TOKEN_VOID},
 	{"i8", TOKEN_I8},
 	{"i16", TOKEN_I16},

v0/token.h

@@ -16,6 +16,9 @@ typedef enum {
 	TOKEN_SEMICOLON,
     TOKEN_ALIAS,
     TOKEN_PUBLIC,
+    TOKEN_VAR,
+    TOKEN_CONST,
+    TOKEN_STATIC,
 
     /* Symbols */
     TOKEN_PARENT_OPEN,