feat+ref: refactor + new types

include/compiler/fzl_parser.h

@@ -21,7 +21,10 @@ typedef enum
   FZL_NODETYPE_MOD,
 
   FZL_NODETYPE_UNARY_PLUS,
-  FZL_NODETYPE_UNARY_MINUS
+  FZL_NODETYPE_UNARY_MINUS,
+
+  FZL_NODETYPE_DECLARATION,
+  FZL_NODETYPE_ASSIGN
 } fzl_nodetype_t;
 
 // AST node descriptor

include/compiler/fzl_reader.h

@@ -21,8 +21,10 @@ typedef struct
 
   char *source;
   size_t size;
+
   size_t position;
-  bool at_end;
+  size_t line_start;
+  size_t line_n;
 } fzl_reader_t;
 
 // Allocate new reader

include/compiler/fzl_token.h

@@ -9,11 +9,13 @@
 typedef enum
 {
   FZL_TOKTYPE_NAME, // abc
+  FZL_TOKTYPE_TYPE, // i16
 
   FZL_TOKTYPE_LPAREN, // (
   FZL_TOKTYPE_RPAREN, // )
 
   FZL_TOKTYPE_COMMA, // ,
+  FZL_TOKTYPE_DOT,   // .
 
   FZL_TOKTYPE_STR_LITERAL, // ""
   FZL_TOKTYPE_NUM_LITERAL, // 123
@@ -24,21 +26,23 @@ typedef enum
   FZL_TOKTYPE_MINUS,   // -
   FZL_TOKTYPE_CARET,   // ^
   FZL_TOKTYPE_PERCENT, // %
+
+  FZL_TOKTYPE_EQ // =
 } fzl_toktype_t;
 
 // Token descriptor
 typedef struct
 {
   fzl_toktype_t type;
-  uint16_t i0;
-  uint16_t i1;
+  size_t ln;
+  size_t cn;
   bool store_value;
   void *value;
   uint16_t value_sz;
 } fzl_token_t;
 
 // Allocate new token
-fzl_token_t *fzl_mktoken(const fzl_toktype_t type, uint16_t from, uint16_t to,
+fzl_token_t *fzl_mktoken(const fzl_toktype_t type, size_t line, size_t col,
                          void *value, size_t value_sz);
 
 // Free token and its contents

include/compiler/fzl_walker.h

@@ -2,10 +2,21 @@
 #define FZL_WALKER_H
 
 #include <common/fzl_opcodes.h>
+#include <common/fzl_types.h>
 #include <compiler/fzl_parser.h>
 #include <compiler/utils/fzl_const_pool.h>
+#include <stdbool.h>
 #include <stddef.h>
 
+// Internal walk function result
+typedef struct
+{
+  fzl_type_t type;
+
+  char *error_msg;
+  bool error;
+} fzl_walk_res_t;
+
 // Walker descriptor
 typedef struct
 {