feature: stages

stages: separate scanning and parsing, allowing `v`, `vn`, `vt` lines to
be mapped to line numbers and store line data (once).

first stage parsing: parse face data and validate vertices.

TODO:
* improve validation (detect partial normals/texcoords);
* maybe improve storage of triangle line number instead of storing line
  number for each vertex;

src/main.cpp

@@ -12,7 +12,8 @@
 #include <stdexcept>
 #include <variant>
 
-#include "file.hpp"
+#include "parse.hpp"
+#include "scan.hpp"
 #include "settings.hpp"
 
 static void usage(const char* prog) {
@@ -27,8 +28,17 @@ static void usage(const char* prog) {
                  "  --                   end of options\n";
 }
 
+#define CATCH_AND_RETURN(variable, exception, return_value, initializer) \
+    decltype(initializer) variable; \
+    try { \
+        variable = initializer; \
+    } catch (exception __ex__) { \
+        std::cerr << __ex__.what() << std::endl; \
+        return return_value; \
+    }
+
 int main(int argc, char** argv) {
-    using namespace wavefront::parser;
+    using namespace wavefront;
 
     if (argc < 3) {
         usage(argv[0]);
@@ -108,17 +118,19 @@ int main(int argc, char** argv) {
 
     Settings settings = settings_builder.build();
 
-    std::variant<File<float, uint32_t>, File<double, uint32_t>> file = [&]() -> decltype(file) {
-        if (settings.use_float64()) {
-            return File<double, uint32_t>();
-        } else {
-            return File<float, uint32_t>();
-        }
-    }();
+    CATCH_AND_RETURN(scan_data, wavefront::scan_error, 1, wavefront::scan(
+        settings.input(),
+        settings.selected_objects(),
+        settings.selected_groups())
+    );
 
-    std::visit([&](auto& file) {
-        file.parse(settings);
-    }, file);
+    CATCH_AND_RETURN(triangle_data, wavefront::parse_error, 1, wavefront::parse_face_data(scan_data));
+
+    std::cerr << "Scanned " << scan_data.total_lines << " lines\n";
+    std::cerr << "Found " << scan_data.category_map["v"].size() << " vertices\n";
+    std::cerr << "Found " << scan_data.category_map["vn"].size() << " normals\n";
+    std::cerr << "Found " << scan_data.category_map["vt"].size() << " texture coordinates\n";
+    std::cerr << "Found " << scan_data.category_map["f"].size() << " faces\n";
 
     return 0;
 }