Start of a ragel parser that can do the ansi code parsing for me.

scratchpad/testragel.rl

@@ -1,26 +1,74 @@
 #include <fmt/core.h>
+#include <string>
+#include <vector>
+#include <string_view>
+#include <charconv>
+#include "dbc.hpp"
 
 using namespace fmt;
 
 %%{
   machine foo;
-  test1 = 0x1B . "[" . [0-9]+ @{ println("NUM1"); } . ";" . [0-9]+ @{ println("NUM2"); } . "m" 0 @{ res = 1; };
-  test2 = 0x1B "A" [0-9]+ @{ println("NUM1"); } ";" [0-9]+ @{ println("NUM2"); } "m" 0 @{ res = 2; };
 
-  main := (test1 | test2);
+  action tstart {
+    start = fpc;
+  }
+
+  action number {
+    size_t value = 0;
+    auto [ptr, ec] = std::from_chars(start, fpc, value);
+    dbc::check(ec == std::errc(), "error in number parsing");
+    println("NUMBER {}", value);
+  }
+
+  start = 0x1B "[";
+  num = digit+ >tstart %number;
+
+  color256 = ";5;" (num ";"?)**;
+  color24b = ";2;" (num ";"?)**;
+  basic = num ";" num;
+  single = num;
+
+  main := |*
+      start => { println("START"); };
+      single => { println("single"); };
+      basic => { println("basic"); };
+      color256 => { println("256 color"); };
+      color24b => { println("true color"); };
+      "m" => { println("END"); };
+    *|;
 }%%
 
 %% write data;
 
-int main() {
-  int cs, res = 0;
-  char *test = "\x1B[36;46m";
+void parse_ansi(std::string_view &codes) {
+  const char *start = NULL;
+  int cs = 0;
+  size_t act = 0;
+  const char *p = codes.data();
+  const char *pe = p + codes.size();
+  const char *ts = p;
+  const char *te = pe;
+  const char *eof = pe;
 
-  char *p = test;
-  char *pe = p + strlen(p) + 1;
   %% write init;
   %% write exec;
+}
+
+int main() {
+  // possibly put alphtype unsigned int?
+  std::vector<std::string_view> tests = {
+    "\x1B[;5;78;98m",
+    "\x1B[;2;36;46;23m",
+    "\x1B[36;46m",
+    "\x1B[36m",
+  };
+
+
+  for(auto test : tests) {
+    println("--- PARSING");
+    parse_ansi(test);
+  }
 
-  fmt::println("result = {}", res);
   return 0;
 }