Token refactor and better logs

v0/log.c

@@ -1,5 +1,7 @@
 #include "log.h"
 #include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
 
 static LogError* s_logError = NULL;
 
@@ -14,3 +16,38 @@ void log_error(const char* msg) {
         fprintf(stderr, "Error: %s\n", msg);
     }
 }
+
+void log_on_line(const char* filename, const char* line_text, int line, int from, int to, const char* msg) {
+    char line_prefix[32];
+    int prefix_len = snprintf(line_prefix, sizeof(line_prefix), "%d| ", line);
+    
+    int caret_len = to - from + 1;
+    if (caret_len < 1) caret_len = 1;
+
+    size_t total_size = strlen(filename) + 16 + // --- filename ---
+                        prefix_len + strlen(line_text) + 2 + // line| text\n
+                        prefix_len + from - 1 + caret_len + 2 + // indent + ^^\n
+                        prefix_len + strlen(msg) + 2 + // indent + msg\n
+                        1;
+
+    char* buffer = (char*)malloc(total_size);
+    if (!buffer) return;
+
+    char* p = buffer;
+    p += sprintf(p, "--- %s ---\n", filename);
+    p += sprintf(p, "%s%s\n", line_prefix, line_text);
+    
+    // Caret line
+    for (int i = 0; i < prefix_len + from - 1; i++) *p++ = ' ';
+    for (int i = 0; i < caret_len; i++) *p++ = '^';
+    *p++ = '\n';
+
+    // Message line
+    for (int i = 0; i < prefix_len; i++) *p++ = ' ';
+    p += sprintf(p, "%s\n", msg);
+    
+    *p = '\0';
+
+    log_error(buffer);
+    free(buffer);
+}