refactor: changes and additions ot parser

include/lexer.h

@@ -10,6 +10,7 @@
 typedef enum {
     NODE_INTEGER,
     NODE_BINARY_OP,
+    NODE_UNARY_OP,
 } ASTNodeType;
 
 // For classify operators
@@ -17,7 +18,8 @@ typedef enum {
     OP_ADD,
     OP_SUB,
     OP_MUL,
-    OP_DIV
+    OP_DIV,
+    OP_POW,
 } Operator;
 
 typedef enum {
@@ -26,8 +28,6 @@ typedef enum {
     LEXER_FAILED_NUMBER_CONVERSION,
     LEXER_NOT_RECOGNIZED_SYMBOL,
     LEXER_EMPTY_INPUT,
-    LEXER_NULL_ARG,
-    LEXER_WRONG_SYNTAX,
     LEXER_BUF_OVERFLOW,
 } LexerErr;
 
@@ -41,6 +41,10 @@ typedef struct ASTNode {
             struct ASTNode *right;
             Operator op;
         } binary;
+        struct {
+            struct ASTNode *val;
+            Operator op;
+        } unary;
     } data;
 } ASTNode;
 

include/parser.h

@@ -32,8 +32,10 @@ typedef struct {
 ASTNode *nud(ArraySlice *slice);
 ASTNode *led(ArraySlice *slice, size_t right_precedence);
 
-uint8_t node_lbp(ASTNode node);
-uint8_t node_rbp(ASTNode node);
+uint8_t prefix_lbp(ASTNode node);
+uint8_t prefix_rbp(ASTNode node);
+uint8_t infix_lbp(ASTNode node);
+uint8_t infix_rbp(ASTNode node);
 
 ParseResult parse(TokenizeResult tokens);
 ASTNode *parse_expr(ArraySlice *slice, Arena *arena, uint8_t min_bp);