feat+fix: make compiler STRONGAAA

- FEAT: add source code length field in `fzl_reader_t` struct
- FIX: check name, lpair (lparen) and rpair (rparen) when lexing call
- FIX: check string literal termination
- FIX: increment position even on empty string to prevent infinite
lexing loop
- FIX: add string terminator in `fzl_mktoken` when allocating space for
string value
- FIX: add check for errors in recursevly called `walk`
- FIX: change source code holder from stack-stored `char[8192]` to
dynamically allocated with actual file size holder
- FIX: correct constant hasing util to hash actual string value instead
of link

src/compiler/main.c

@@ -102,7 +102,7 @@ int main(int argc, char **argv)
   if (args->verbose)
     printf("> analyze\n-> reading file...");
 
-  char source[8192];
+  char *source;
   FILE *fd = fopen(args->filepath, "r");
   if (!fd)
   {
@@ -114,11 +114,15 @@ int main(int argc, char **argv)
   size_t fsz = ftell(fd);
   rewind(fd);
 
+  source = malloc(fsz + 1);
   fread(source, fsz, 1, fd);
   fclose(fd);
+  source[fsz] = '\0';
+
   if (args->verbose)
   {
     printf("ok!\n");
+    printf("--> Red %ld bytes\n", fsz);
     printf("-> tokenizing...");
   }
 
@@ -218,10 +222,11 @@ int main(int argc, char **argv)
   if (args->verbose)
     printf("ok!\n");
 
+  free(source);
   free(args);
   fzl_freereader(rd);
-  fzl_freeparser(parser);
   fzl_freeast(parser->root);
+  fzl_freeparser(parser);
   fzl_freewalker(walker);
   fzl_freewriter(writer);