git subrepo clone (merge) git@github.com:Rconybea/xo-tokenizer.git xo-tokenizer

subrepo:
  subdir:   "xo-tokenizer"
  merged:   "6e665ed7"
upstream:
  origin:   "git@github.com:Rconybea/xo-tokenizer.git"
  branch:   "main"
  commit:   "6e665ed7"
git-subrepo:
  version:  "0.4.9"
  origin:   "???"
  commit:   "???"

xo-tokenizer/example/tokenrepl/tokenrepl.cpp

@@ -0,0 +1,71 @@
+/** @file tokenrepl.cpp **/
+
+#include "xo/tokenizer/tokenizer.hpp"
+#include <iostream>
+#include <unistd.h> // for isatty
+
+bool repl_getline(bool interactive,
+                  std::istream & in,
+                  std::ostream & out,
+                  std::string & input)
+{
+    if (interactive) {
+        out << "> ";
+        std::flush(out);
+    }
+
+    return static_cast<bool>(std::getline(in, input));
+}
+
+int
+main() {
+    using namespace xo::scm;
+    using namespace std;
+
+    using tokenizer_type = tokenizer<char>;
+    using span_type = tokenizer_type::span_type;
+
+    xo::log_config::min_log_level = xo::log_level::severe;
+
+    bool interactive = isatty(STDIN_FILENO);
+
+    tokenizer_type tkz(xo::log_config::min_log_level <= xo::log_level::info);
+    string input_str;
+
+    size_t line_no = 1;
+
+    constexpr std::size_t c_maxlines = 25;
+
+    while (repl_getline(interactive, cin, cout, input_str)) {
+        // we want tokenizer to see newline, it's syntax
+        input_str.push_back('\n');
+        span_type input = span_type::from_string(input_str);
+
+        // reminder: input may contain multiple tokens
+        while (!input.empty()) {
+            auto [tk, consumed, error] = tkz.scan(input, false /*!eof*/);
+
+            if (tk.is_valid()) {
+                cout << tk << endl;
+            } else if (error.is_error()) {
+                cout << "tokenizer error: " << endl;
+                error.report(cout);
+
+                break;
+            }
+
+            input = input.after_prefix(consumed);
+        }
+
+        /* here: input.empty() or error encountered */
+
+        ++line_no;
+
+        if (line_no > c_maxlines) {
+            cout << "always exit after " << c_maxlines << " lines of input" << endl;
+            break;
+        }
+    }
+}
+
+/** end tokenrepl.cpp */