WOW, finally making some sense, i think i get it, finally got the skelleton, gonna keep reading for adding more interesting things and doing things right, for now i think i got the parse_expr

include/parser.h

@@ -1,4 +1,5 @@
 #include "lexer.h"
+#include <stdint.h>
 
 typedef struct {
     ASTNode *head;
@@ -9,13 +10,13 @@ typedef struct {
     size_t pos;
 } ASTNodeSlice;
 
-ASTNode ASTNodeSlice_peek(ASTNodeSlice slice);
-ASTNode ASTNodeSlice_next(ASTNodeSlice slice);
+ASTNode ASTNodeSlice_peek(ASTNodeSlice *slice);
+ASTNode ASTNodeSlice_next(ASTNodeSlice *slice);
 
 ASTNode *nud(ASTNodeSlice *slice);
 ASTNode *led(ASTNodeSlice *slice, size_t right_precedence);
 
-size_t node_lbp(ASTNode node);
-size_t node_rbp(ASTNode node);
+uint8_t node_lbp(ASTNode node);
+uint8_t node_rbp(ASTNode node);
 AST parse(ASTNodeArray arr);
-AST parse_expr(ASTNodeSlice *arr);
+ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp);

src/parser.c

@@ -1,8 +1,9 @@
 #include "parser.h"
 #include "lexer.h"
+#include <stdint.h>
 #include <stdlib.h>
 
-size_t node_lbp(ASTNode node) {
+uint8_t node_lbp(ASTNode node) {
     if (node.type == NODE_INTEGER) {
         return 0;
     }
@@ -14,13 +15,13 @@ size_t node_lbp(ASTNode node) {
             break;
         case OP_DIV:
         case OP_MUL:
-            return 20;
+            return 30;
         default:
             return 0;
     }
 }
 
-size_t node_rbp(ASTNode node) {
+uint8_t node_rbp(ASTNode node) {
     if (node.type == NODE_INTEGER) {
         return 0;
     }
@@ -28,12 +29,43 @@ size_t node_rbp(ASTNode node) {
     switch (node.data.binary.op) {
         case OP_ADD:
         case OP_SUB:
-            return 10;
+            return 20;
             break;
         case OP_DIV:
         case OP_MUL:
-            return 20;
+            return 40;
     }
 }
 
+ASTNode *parse_expr(ASTNodeSlice *slice, uint8_t min_bp) {
+    ASTNode *left_side = malloc(sizeof(ASTNode));
+    *left_side = ASTNodeSlice_next(slice);
 
+    while (true) {
+        if (slice->pos >= slice->arr->len - 1) {
+            break;
+        }
+
+        ASTNode operator = operator = ASTNodeSlice_peek(slice);
+        uint8_t rbp = node_rbp(operator);
+        uint8_t lbp = node_lbp(operator);
+
+        if (lbp < min_bp) {
+            break;
+        }
+
+        ASTNodeSlice_next(slice);
+        ASTNode *right_side = parse_expr(slice, rbp);
+
+        ASTNode *new_node = malloc(sizeof(ASTNode));
+        *new_node = operator;
+
+        new_node->data.binary.left = left_side;
+        new_node->data.binary.right = right_side;
+
+        left_side = new_node;
+    }
+
+
+    return left_side;
+}