+ xo-tokenizer2 xo-reader2 xo-expression2 xo-interpreter2

2nd gen schematika interpreter using fomo

src/tokenizer2/TokenizerError.cpp

@@ -0,0 +1,60 @@
+/** @file TokenizerError.cpp
+ *
+ *  @author Roland Conybeare, Jun 2025
+ **/
+
+#include "TokenizerError.hpp"
+
+namespace xo {
+    namespace scm {
+
+        void
+        TokenizerError::print(std::ostream & os) const
+        {
+            os << "<tokenizer-error"
+               << xtag("src-function", src_function_)
+               << xtag("message", error_description_)
+               << xtag("input", input_state_.current_line())
+               << xtag("whitespace", input_state_.whitespace())
+               << xtag("error-pos", error_pos_)
+               << ">";
+        }
+
+        void
+        TokenizerError::report(std::ostream & os) const
+        {
+            using namespace std;
+
+            if (!error_description_.empty()) {
+                const char * prefix = "input: ";
+                /* input_state.tk_start:    position of first character in token
+                 * input_state.current_pos: position of first character following preceding token.
+                 * error_pos:               position (relative to start) at which failure detected
+                 */
+                const size_t tk_start = input_state_.tk_start();
+                const size_t tk_indent = (strlen(prefix) + tk_start);
+                const size_t error_pos = 1 + tk_start + error_pos_;
+
+                os << "token col: " << tk_start << ", error col: " << error_pos << "\n";
+                os << prefix;
+                for (const char *p = input_state_.current_line().lo(),
+                         *e = input_state_.current_line().hi(); p < e; ++p)
+                {
+                    os << *p;
+                }
+                //os << endl;
+                os << std::setw(tk_indent) << " ";
+
+                for (size_t i = 0; i < error_pos_; ++i) {
+                    os << '_';
+                }
+                os << '^' << endl;
+
+                os << error_description_ << endl;
+            }
+        }
+
+    } /*namespace scm*/
+} /*namespace xo*/
+
+/* end TokenizerError.cpp */