refactor parse + unit test

CMakeLists.txt

@@ -7,5 +7,51 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-g -O3")
 set(CMAKE_CXX_FLAGS "-fno-threadsafe-statics")
 
-file(GLOB SRC_FILES src/*.cpp)
+option(ENABLE_COVERAGE "Enable coverage instrumentation for tests" OFF)
+
+file(GLOB SRC_FILES CONFIGURE_DEPENDS src/*.cpp)
+
+set(APP_SOURCES ${SRC_FILES})
+list(REMOVE_ITEM APP_SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/src/main.cpp)
+
 add_executable(wavefront_parser ${SRC_FILES})
+target_include_directories(wavefront_parser PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+
+find_package(GTest REQUIRED)
+
+enable_testing()
+
+add_executable(wavefront_tests
+	tests/unit/trim_test.cpp
+	tests/unit/settings_test.cpp
+	tests/unit/scan_test.cpp
+	tests/unit/parse_test.cpp
+	${APP_SOURCES}
+)
+target_link_libraries(wavefront_tests PRIVATE
+	GTest::gtest
+	GTest::gmock
+	GTest::gtest_main
+)
+target_include_directories(wavefront_tests PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
+
+if(ENABLE_COVERAGE AND CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
+	target_compile_options(wavefront_tests PRIVATE --coverage -O0 -g)
+	target_link_options(wavefront_tests PRIVATE --coverage)
+endif()
+
+include(GoogleTest)
+gtest_discover_tests(wavefront_tests)
+
+find_program(LCOV_EXECUTABLE lcov)
+find_program(GENHTML_EXECUTABLE genhtml)
+if(LCOV_EXECUTABLE AND GENHTML_EXECUTABLE)
+	add_custom_target(coverage
+		COMMAND ${LCOV_EXECUTABLE} --directory "${CMAKE_BINARY_DIR}" --capture --rc geninfo_unexecuted_blocks=1 --demangle-cpp --ignore-errors inconsistent --keep-going --output-file coverage.info
+		COMMAND ${LCOV_EXECUTABLE} --extract coverage.info "${CMAKE_SOURCE_DIR}/src/*" --output-file coverage.info
+		COMMAND ${GENHTML_EXECUTABLE} coverage.info --output-directory coverage
+		WORKING_DIRECTORY "${CMAKE_BINARY_DIR}"
+		COMMENT "Generating lcov report at \"${CMAKE_BINARY_DIR}/coverage/index.html\""
+		VERBATIM
+	)
+endif()

coverage.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cmake -S . -B build/Coverage -DCMAKE_BUILD_TYPE=Debug -DENABLE_COVERAGE=ON
+cmake --build build/Coverage --config Debug
+ctest --test-dir build/Coverage --output-on-failure
+cmake --build build/Coverage --target coverage
+
+echo "Coverage report: file://$(pwd)/build/Coverage/coverage/index.html"

src/compile.hpp

@@ -88,12 +88,12 @@ namespace wavefront {
                     } else {
                         target.push_back(0);
                     }
+                    std::copy(
+                        source.begin(),
+                        source.end(),
+                        std::back_inserter(target)
+                    );
                 }
-                std::copy(
-                    source.begin(),
-                    source.end(),
-                    std::back_inserter(target)
-                );
             },
             std::index_sequence<1, 2, 3>{}
         );
@@ -227,20 +227,28 @@ namespace wavefront {
                 std::array<IndexType, 3> triangle_data;
                 std::size_t triangle_vertex_index = 0;
                 for (const auto &vertex : triangle) {
-                    std::array<IndexType, VertexDimCount> coordinate_indices;
-                    for (std::size_t i = 0; i < VertexDimCount; ++i) {
-                        const auto &wavefront_index = mapper[i].get_vertex_index(vertex);
-                        const auto &line_index = mapper[i].attribute_line_map.at(wavefront_index);
-                        const auto &coordinate_index = mapper[i].line_coordinate_map.at(line_index);
+                    if constexpr (VertexDimCount > 1) {
+                        std::array<IndexType, VertexDimCount> coordinate_indices;
+                        for (std::size_t i = 0; i < VertexDimCount; ++i) {
+                            const auto &wavefront_index = mapper[i].get_vertex_index(vertex);
+                            const auto &line_index = mapper[i].attribute_line_map.at(wavefront_index);
+                            const auto &coordinate_index = mapper[i].line_coordinate_map.at(line_index);
+                            assert(coordinate_index != 0);
+                            coordinate_indices[i] = coordinate_index;
+                        }
+                        auto iterator = std::lower_bound(vertex_data.begin(), vertex_data.end(), coordinate_indices);
+                        assert(iterator != vertex_data.end());
+                        auto index = std::distance(vertex_data.begin(), iterator);
+                        assert(index != 0);
+                        assert(triangle_vertex_index < 3);
+                        triangle_data[triangle_vertex_index++] = index;
+                    } else {
+                        const auto &wavefront_index = mapper[0].get_vertex_index(vertex);
+                        const auto &line_index = mapper[0].attribute_line_map.at(wavefront_index);
+                        const auto &coordinate_index = mapper[0].line_coordinate_map.at(line_index);
                         assert(coordinate_index != 0);
-                        coordinate_indices[i] = coordinate_index;
+                        triangle_data[triangle_vertex_index++] = coordinate_index;
                     }
-                    auto iterator = std::lower_bound(vertex_data.begin(), vertex_data.end(), coordinate_indices);
-                    assert(iterator != vertex_data.end());
-                    auto index = std::distance(vertex_data.begin(), iterator);
-                    assert(index != 0);
-                    assert(triangle_vertex_index < 3);
-                    triangle_data[triangle_vertex_index++] = index;
                 }
                 assert(triangle_vertex_index == 3);
                 triangle_data_set.emplace(triangle_data);

src/main.cpp

@@ -124,10 +124,10 @@ int main(int argc, char** argv) {
     using FloatType = float;
     using IndexType = std::uint32_t;
 
-    CATCH_AND_RETURN(scan_data, wavefront::scan_error, 1, wavefront::scan(
+    auto scan_data = wavefront::scan(
         settings.input(),
         settings.selected_objects(),
-        settings.selected_groups())
+        settings.selected_groups()
     );
 
     std::cerr << "Scanned " << scan_data.total_lines << " lines" << std::endl;
@@ -177,9 +177,10 @@ int main(int argc, char** argv) {
 
     auto &output = settings.output();
 
-    // 0:8
+    // 0:4: Signature
     settings.output().write("\x7F" "3DG", 4);
-    wavefront::write_number<std::uint32_t>(output, 0);
+    // 4:8: Version
+    wavefront::write_number<std::uint32_t>(output, 1);
 
     std::uint32_t flags = 0;
 
@@ -198,37 +199,27 @@ int main(int argc, char** argv) {
         }
     }, coordinate_data.texture_coordinates);
 
-    std::visit([&](const auto &vertex_data) {
-        if constexpr (std::ranges::range<std::decay_t<decltype(vertex_data)>>) {
-            using mapped_type = typename std::decay_t<decltype(vertex_data)>::value_type;
-            if constexpr (std::ranges::range<mapped_type>) {
-                flags |= std::tuple_size_v<mapped_type> << 4;
-            } else {
-                flags |= 1 << 4;
-            }
-        }
-    }, index_storage.vertices);
-
-    // 8:12
+    // 8:12: flags<0: float_size, 1: has_normals, 2&3: texcoord_ndims (0 = no), 
     wavefront::write_number<std::uint32_t>(output, flags);
     
-    // 12:16
+    // 12:16: number_list item count
     wavefront::write_number<std::uint32_t>(output, number_list.size());
 
-    // 16:28
-    wavefront::write_number<std::uint32_t>(output, std::get<1>(coordinate_storage).size());
+    // 16:20: 2D storage item count
     wavefront::write_number<std::uint32_t>(output, std::get<2>(coordinate_storage).size());
+    // 20:24: 3D storage item count
     wavefront::write_number<std::uint32_t>(output, std::get<3>(coordinate_storage).size());
 
-    // 28:36
-    std::visit([&](const auto &vertex_data){
-        wavefront::write_number<std::uint32_t>(output, vertex_data.size());
+    // 24:28: Vertex storage item count
+    std::visit([&](const auto &vertex_data) {
+        using value_t = std::decay_t<decltype(vertex_data)>::value_type;
+        if constexpr (std::tuple_size_v<value_t> > 1) {
+            wavefront::write_number<std::uint32_t>(output, vertex_data.size());
+        } else {
+            wavefront::write_number<std::uint32_t>(output, 0);
+        }
     }, index_storage.vertices);
     wavefront::write_number<std::uint32_t>(output, index_storage.triangles.size());
-    
-    // 36:48
-    wavefront::write_number<std::uint32_t>(output, 0);
-    wavefront::write_number<std::uint64_t>(output, 0);
 
     output.write(reinterpret_cast<const char *>(number_list.data()), number_list.size() * sizeof(decltype(number_list)::value_type));
 
@@ -239,16 +230,6 @@ int main(int argc, char** argv) {
     required_padding = (16 - (number_list.size() * sizeof(decltype(number_list)::value_type) % 16)) % 16;
     output.write(padding.data(), required_padding);
 
-    if (std::get<1>(coordinate_storage).size() > 0) {
-        const auto &value_list = std::get<1>(coordinate_storage);
-        using value_t = std::decay_t<decltype(value_list)>::value_type;
-        output.write(reinterpret_cast<const char *>(value_list.data()), value_list.size() * sizeof(value_t));
-        required_padding = (16 - (value_list.size() * sizeof(value_t) % 16)) % 16;
-        if (required_padding > 0) {
-            output.write(padding.data(), required_padding);
-        }
-    }
-
     if (std::get<2>(coordinate_storage).size() > 0) {
         const auto &value_list = std::get<2>(coordinate_storage);
         using value_t = std::decay_t<decltype(value_list)>::value_type;
@@ -271,10 +252,12 @@ int main(int argc, char** argv) {
 
     std::visit([&](const auto &vertex_data) {
         using value_t = std::decay_t<decltype(vertex_data)>::value_type;
-        output.write(reinterpret_cast<const char *>(vertex_data.data()), vertex_data.size() * sizeof(value_t));
-        required_padding = (16 - (vertex_data.size() * sizeof(value_t) % 16)) % 16;
-        if (required_padding > 0) {
-            output.write(padding.data(), required_padding);
+        if constexpr (std::tuple_size_v<value_t> > 1) {
+            output.write(reinterpret_cast<const char *>(vertex_data.data()), vertex_data.size() * sizeof(value_t));
+            required_padding = (16 - (vertex_data.size() * sizeof(value_t) % 16)) % 16;
+            if (required_padding > 0) {
+                output.write(padding.data(), required_padding);
+            }
         }
     }, index_storage.vertices);
 

src/parse.hpp

@@ -55,313 +55,15 @@ namespace wavefront {
     wavefront_face_data_result_t parse_face_data(const scan_result &scan_data);
     
     template<typename FloatType>
-    coordinate_data_t<FloatType> parse_coordinate_data(const scan_result &scan_data, const wavefront_face_data_result_t &face_data) {
-        using namespace std::string_literals;
-        coordinate_data_t<FloatType> result;
-
-        const auto &position_data = scan_data.category_map.at("v"s);
-        for (const auto &position_index : face_data.index_position_set) {
-            std::array<FloatType, 3> position_coordinates;
-            const auto &position_line_index = position_data.at(position_index);
-            const auto &position_line = scan_data.line_data.at(position_line_index);
-            
-            decltype(position_line.find_first_of(' ')) number_begin_pos = 2, number_end_pos;
-            for (std::size_t position_coordinate_index = 0; position_coordinate_index < 3; position_coordinate_index++) {
-                if (number_begin_pos >= position_line.size()) {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        position_line_index,
-                        std::format("Line \"{}\" must contain at least {} numbers", "v", 3)
-                    ));
-                }
-                number_end_pos = std::min(position_line.find_first_of(' ', number_begin_pos), position_line.size());
-                auto [number_end, conversion_error] = std::from_chars(
-                    position_line.data() + number_begin_pos,
-                    position_line.data() + number_end_pos,
-                    position_coordinates[position_coordinate_index],
-                    std::chars_format::fixed
-                );
-                if (conversion_error != std::errc() || position_line.data() + number_end_pos != number_end) {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        position_line_index,
-                        std::format("Unable to parse \"{}\" floating point value", "v")
-                    ));
-                }
-                number_begin_pos = std::min(position_line.find_first_not_of(' ', number_end_pos), position_line.size());
-            }
-            if (number_begin_pos < position_line.size()) {
-                if (position_line.find_first_not_of("0123456789.-", number_begin_pos)) {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        position_line_index,
-                        std::format("Additional data in \"{}\" line: expected {} only", "v", "<x> <y> <z> [weight]")
-                    ));
-                }
-            }
-            result.position_coordinates[position_line_index] = position_coordinates;
-        }
-        if (face_data.index_normal_set.size() > 0 && scan_data.category_map.contains("vn"s)) {
-            const auto &normal_data = scan_data.category_map.at("vn"s);
-            for (const auto &normal_index : face_data.index_normal_set) {
-                std::array<FloatType, 3> normal_coordinates;
-                const auto &normal_line_index = normal_data.at(normal_index);
-                const auto &normal_line = scan_data.line_data.at(normal_line_index);
-
-                decltype(normal_line.find_first_of(' ')) number_begin_pos = 3, number_end_pos;
-                for (std::size_t normal_coordinate_index = 0; normal_coordinate_index < 3; normal_coordinate_index++) {
-                    if (number_begin_pos >= normal_line.size()) {
-                        throw parse_error(std::format(
-                            "[{}]: {}",
-                            normal_line_index,
-                            std::format("Line \"{}\" must contain exactly {} numbers", "vn", 3)
-                        ));
-                    }
-                    number_end_pos = std::min(normal_line.find_first_of(' ', number_begin_pos), normal_line.size());
-                    auto [number_end, conversion_error] = std::from_chars(
-                        normal_line.data() + number_begin_pos,
-                        normal_line.data() + number_end_pos,
-                        normal_coordinates[normal_coordinate_index],
-                        std::chars_format::fixed
-                    );
-                    if (conversion_error != std::errc() || normal_line.data() + number_end_pos != number_end) {
-                        throw parse_error(std::format(
-                            "[{}]: {}",
-                            normal_line_index,
-                            std::format("Unable to parse \"{}\" floating point value", "vn")
-                        ));
-                    }
-                    number_begin_pos = std::min(normal_line.find_first_not_of(' ', number_end_pos), normal_line.size());
-                }
-                if (number_end_pos != normal_line.size()) {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        normal_line_index,
-                        std::format("Additional data in \"{}\" line: expected {} only", "vn", "<x> <y> <z>")
-                    ));
-                }
-                result.normal_coordinates[normal_line_index] = normal_coordinates;
-            }
-        }
-
-        if (face_data.index_texcoord_set.size() > 0 && scan_data.category_map.contains("vt"s)) {
-            using insert_texcoord_data_t = std::function<void()>;
-
-            const auto &texcoord_data = scan_data.category_map.at("vt"s);
-            for (const auto &texcoord_index : face_data.index_texcoord_set) {
-                std::array<FloatType, 3> texcoord_coordinates;
-                const auto &texcoord_line_index = texcoord_data.at(texcoord_index);
-                const auto &texcoord_line = scan_data.line_data.at(texcoord_line_index);
-
-                decltype(texcoord_line.find_first_of(' ')) number_begin_pos = 3, number_end_pos;
-                std::size_t texcoord_coordinate_index = 0;
-                while (number_begin_pos < texcoord_line.size()) {
-                    if (texcoord_coordinate_index >= 3) {
-                        throw parse_error(std::format(
-                            "[{}]: {}",
-                            texcoord_line_index,
-                            std::format("Line \"{}\" must contain maximum {} numbers", "vt", 3)
-                        ));
-                    }
-                    number_end_pos = std::min(texcoord_line.find_first_of(' ', number_begin_pos), texcoord_line.size());
-                    auto [number_end, conversion_error] = std::from_chars(
-                        texcoord_line.data() + number_begin_pos,
-                        texcoord_line.data() + number_end_pos,
-                        texcoord_coordinates[texcoord_coordinate_index++],
-                        std::chars_format::fixed
-                    );
-                    if (conversion_error != std::errc() || texcoord_line.data() + number_end_pos != number_end) {
-                        throw parse_error(std::format(
-                            "[{}]: {}",
-                            texcoord_line_index,
-                            std::format("Unable to parse \"{}\" floating point value", "vt")
-                        ));
-                    }
-                    number_begin_pos = std::min(texcoord_line.find_first_not_of(' ', number_end_pos), texcoord_line.size());
-                }
-                if (texcoord_coordinate_index == 0) [[unlikely]] {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        texcoord_line_index,
-                        std::format("Unable to parse \"{}\" line: expected minimum one number", "vt")
-                    ));
-                }
-                if (result.texture_coordinates.valueless_by_exception() || result.texture_coordinates.index() == 0) [[unlikely]] {
-                    if (texcoord_coordinate_index == 1) {
-                        result.texture_coordinates = std::map<file_line_t, FloatType>{};
-                    } else if (texcoord_coordinate_index == 2) {
-                        result.texture_coordinates = std::map<file_line_t, std::array<FloatType, 2>>{};
-                    } else if (texcoord_coordinate_index == 3) {
-                        result.texture_coordinates = std::map<file_line_t, std::array<FloatType, 3>>{};
-                    } else {
-                        throw parse_error(std::format(
-                            "[{}]: {}",
-                            texcoord_line_index,
-                            std::format("Line \"{}\" must contain maximum {} numbers", "vt", 3)
-                        ));
-                    }
-                }
-                if (texcoord_coordinate_index == 0) [[unlikely]] {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        texcoord_line_index,
-                        std::format("Unable to parse \"{}\" line: expected minimum one number", "vt")
-                    ));
-                }
-                try {
-                    if (texcoord_coordinate_index == 1) {
-                        std::get<1>(result.texture_coordinates)[texcoord_line_index] = texcoord_coordinates[0];
-                    } else if (texcoord_coordinate_index == 2) {
-                        std::get<2>(result.texture_coordinates)[texcoord_line_index] = std::array<FloatType, 2>{texcoord_coordinates[0], texcoord_coordinates[1]};
-                    } else if (texcoord_coordinate_index == 3) {
-                        std::get<3>(result.texture_coordinates)[texcoord_line_index] = texcoord_coordinates;
-                    }
-                } catch (std::bad_variant_access&) {
-                    throw parse_error(std::format(
-                        "[{}]: {}",
-                        texcoord_line_index,
-                        std::format("Line \"{}\": {}D texture coordinates expected, got {}D texture coordinates", "vt", result.texture_coordinates.index(), texcoord_coordinate_index)
-                    ));
-                }
-            }
-        }
-        return result;
-    }
+    coordinate_data_t<FloatType> parse_coordinate_data(const scan_result &scan_data, const wavefront_face_data_result_t &face_data);
 
     template<typename FloatType>
-    std::vector<FloatType> create_number_list(const coordinate_data_t<FloatType> &coordinate_data) {
-        numset_t<FloatType> number_set;
-
-        for (const auto& [line_number, coordinates] : coordinate_data.position_coordinates) {
-            for (const auto &coordinate : coordinates) {
-                number_set.emplace(coordinate);
-            }
-        }
-        for (const auto& [line_number, coordinates] : coordinate_data.normal_coordinates) {
-            for (const auto &coordinate : coordinates) {
-                number_set.emplace(coordinate);
-            }
-        }
-
-        std::visit([&](const auto &texture_coordinate_map) {
-            if constexpr (std::ranges::range<std::decay_t<decltype(texture_coordinate_map)>>) {
-                for (const auto& [line_number, coordinates] : texture_coordinate_map) {
-                    if constexpr (std::ranges::range<std::decay_t<decltype(coordinates)>>) {
-                        for (const auto &coordinate : coordinates) {
-                            number_set.emplace(coordinate);
-                        }
-                    } else {
-                        number_set.emplace(coordinates);
-                    }
-                }
-            }
-        }, coordinate_data.texture_coordinates);
-
-        number_set.emplace(std::numeric_limits<FloatType>::quiet_NaN());
-
-        std::vector<FloatType> number_list;
-        number_list.reserve(number_set.size());
-        std::copy(number_set.begin(), number_set.end(), std::back_inserter(number_list));
-
-        return number_list;
-    }
+    std::vector<FloatType> create_number_list(const coordinate_data_t<FloatType> &coordinate_data);
 
     template<typename FloatType, typename IndexType>
-    coordinate_data_t<IndexType> create_coordinate_index(const coordinate_data_t<FloatType> &coordinate_data, const std::vector<FloatType> &float_list) {
-        coordinate_data_t<IndexType> coordinate_index_data;
-
-        static const auto float_compare = float_is_equal<FloatType>{};
-        static const auto float_less = less_with_nan_first_and_nearly_equal<FloatType>{};
-
-        for (const auto& [line_number, coordinates] : coordinate_data.position_coordinates) {
-            std::array<IndexType, coordinates.size()> position_coordinate_indices;
-            for (decltype(coordinates.size()) dim = 0; dim < coordinates.size(); ++dim) {
-                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
-                assert(iterator != float_list.end());
-                assert(float_compare(*iterator, coordinates[dim]));
-                auto index = std::distance(float_list.begin(), iterator);
-                assert(index != 0);
-                position_coordinate_indices[dim] = index;
-            }
-            coordinate_index_data.position_coordinates[line_number] = position_coordinate_indices;
-        }
-        for (const auto& [line_number, coordinates] : coordinate_data.normal_coordinates) {
-            std::array<IndexType, coordinates.size()> normal_coordinate_indices;
-            for (decltype(coordinates.size()) dim = 0; dim < coordinates.size(); ++dim) {
-                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
-                assert(iterator != float_list.end());
-                assert(float_compare(*iterator, coordinates[dim]));
-                auto index = std::distance(float_list.begin(), iterator);
-                assert(index != 0);
-                normal_coordinate_indices[dim] = index;
-            }
-            coordinate_index_data.normal_coordinates[line_number] = normal_coordinate_indices;
-        }
-        if (!coordinate_data.texture_coordinates.valueless_by_exception() && coordinate_data.texture_coordinates.index() > 0) {
-            std::visit([&](const auto &texture_coordinate_map) {
-                if constexpr (std::ranges::range<std::decay_t<decltype(texture_coordinate_map)>>) {
-                    if constexpr (std::ranges::range<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>) {
-                        coordinate_index_data.texture_coordinates = std::map<
-                            typename std::decay_t<decltype(texture_coordinate_map)>::key_type,
-                            std::array<
-                                IndexType,
-                                std::tuple_size_v<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>
-                            >
-                        >{};
-                    } else {
-                        coordinate_index_data.texture_coordinates = std::map<
-                            typename std::decay_t<decltype(texture_coordinate_map)>::key_type,
-                            IndexType
-                        >{};
-                    }
-                    for (const auto& [line_number, coordinates] : texture_coordinate_map) {
-                        if constexpr (std::ranges::range<std::decay_t<decltype(coordinates)>>) {
-                            std::array<IndexType, coordinates.size()> texcoord_coordinate_indices;
-                            for (std::size_t dim = 0; dim < coordinates.size(); ++dim) {
-                                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
-                                assert(iterator != float_list.end());
-                                assert(float_compare(*iterator, coordinates[dim]));
-                                auto index = std::distance(float_list.begin(), iterator);
-                                assert(index != 0);
-                                texcoord_coordinate_indices[dim] = index;
-                            }
-                            std::visit([&](auto &target_data) {
-                                if constexpr (std::is_same_v<
-                                    std::map<
-                                        file_line_t,
-                                        std::array<
-                                            IndexType,
-                                            std::tuple_size_v<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>
-                                        >
-                                    >,
-                                    typename std::decay_t<decltype(target_data)>
-                                >) {
-                                    target_data[line_number] = texcoord_coordinate_indices;
-                                }
-                            }, coordinate_index_data.texture_coordinates);
-                        } else {
-                            auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates, float_less);
-                            assert(iterator != float_list.end());
-                            assert(float_compare(*iterator, coordinates));
-                            auto coordinate = std::distance(float_list.begin(), iterator);
-                            assert(coordinate != 0);
-                            std::visit([&](auto &target_data) {
-                                if constexpr (std::is_same_v<
-                                    std::map<file_line_t, IndexType>,
-                                    typename std::decay_t<decltype(target_data)>
-                                >) {
-                                    target_data[line_number] = coordinate;
-                                }
-                            }, coordinate_index_data.texture_coordinates);
-                        }
-                    }
-                }
-                int j = 0;
-            }, coordinate_data.texture_coordinates);
-        }
-
-        return coordinate_index_data;
-    }
+    coordinate_data_t<IndexType> create_coordinate_index(const coordinate_data_t<FloatType> &coordinate_data, const std::vector<FloatType> &float_list);
 }
 
+#include "parse.tpp"
+
 #endif // __WAVEFRONT_PARSE_HPP__

src/parse.tpp

@@ -0,0 +1,319 @@
+#ifndef __WAVEFRONT_PARSE_TPP__
+#define __WAVEFRONT_PARSE_TPP__
+
+#include <algorithm>
+#include <limits>
+#include <ranges>
+
+namespace wavefront {
+    template<typename FloatType>
+    coordinate_data_t<FloatType> parse_coordinate_data(const scan_result &scan_data, const wavefront_face_data_result_t &face_data) {
+        using namespace std::string_literals;
+        coordinate_data_t<FloatType> result;
+
+        const auto &position_data = scan_data.category_map.at("v"s);
+        for (const auto &position_index : face_data.index_position_set) {
+            std::array<FloatType, 3> position_coordinates;
+            const auto &position_line_index = position_data.at(position_index);
+            const auto &position_line = scan_data.line_data.at(position_line_index);
+
+            decltype(position_line.find_first_of(' ')) number_begin_pos = 2, number_end_pos;
+            for (std::size_t position_coordinate_index = 0; position_coordinate_index < 3; position_coordinate_index++) {
+                if (number_begin_pos >= position_line.size()) {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        position_line_index,
+                        std::format("Line \"{}\" must contain at least {} numbers", "v", 3)
+                    ));
+                }
+                number_end_pos = std::min(position_line.find_first_of(' ', number_begin_pos), position_line.size());
+                auto [number_end, conversion_error] = std::from_chars(
+                    position_line.data() + number_begin_pos,
+                    position_line.data() + number_end_pos,
+                    position_coordinates[position_coordinate_index],
+                    std::chars_format::fixed
+                );
+                if (conversion_error != std::errc() || position_line.data() + number_end_pos != number_end) {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        position_line_index,
+                        std::format("Unable to parse \"{}\" floating point value", "v")
+                    ));
+                }
+                number_begin_pos = std::min(position_line.find_first_not_of(' ', number_end_pos), position_line.size());
+            }
+            if (number_begin_pos < position_line.size()) {
+                if (position_line.find_first_not_of("0123456789.-", number_begin_pos)) {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        position_line_index,
+                        std::format("Additional data in \"{}\" line: expected {} only", "v", "<x> <y> <z> [weight]")
+                    ));
+                }
+            }
+            result.position_coordinates[position_line_index] = position_coordinates;
+        }
+        if (face_data.index_normal_set.size() > 0 && scan_data.category_map.contains("vn"s)) {
+            const auto &normal_data = scan_data.category_map.at("vn"s);
+            for (const auto &normal_index : face_data.index_normal_set) {
+                std::array<FloatType, 3> normal_coordinates;
+                const auto &normal_line_index = normal_data.at(normal_index);
+                const auto &normal_line = scan_data.line_data.at(normal_line_index);
+
+                decltype(normal_line.find_first_of(' ')) number_begin_pos = 3, number_end_pos;
+                for (std::size_t normal_coordinate_index = 0; normal_coordinate_index < 3; normal_coordinate_index++) {
+                    if (number_begin_pos >= normal_line.size()) {
+                        throw parse_error(std::format(
+                            "[{}]: {}",
+                            normal_line_index,
+                            std::format("Line \"{}\" must contain exactly {} numbers", "vn", 3)
+                        ));
+                    }
+                    number_end_pos = std::min(normal_line.find_first_of(' ', number_begin_pos), normal_line.size());
+                    auto [number_end, conversion_error] = std::from_chars(
+                        normal_line.data() + number_begin_pos,
+                        normal_line.data() + number_end_pos,
+                        normal_coordinates[normal_coordinate_index],
+                        std::chars_format::fixed
+                    );
+                    if (conversion_error != std::errc() || normal_line.data() + number_end_pos != number_end) {
+                        throw parse_error(std::format(
+                            "[{}]: {}",
+                            normal_line_index,
+                            std::format("Unable to parse \"{}\" floating point value", "vn")
+                        ));
+                    }
+                    number_begin_pos = std::min(normal_line.find_first_not_of(' ', number_end_pos), normal_line.size());
+                }
+                if (number_end_pos != normal_line.size()) {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        normal_line_index,
+                        std::format("Additional data in \"{}\" line: expected {} only", "vn", "<x> <y> <z>")
+                    ));
+                }
+                result.normal_coordinates[normal_line_index] = normal_coordinates;
+            }
+        }
+
+        if (face_data.index_texcoord_set.size() > 0 && scan_data.category_map.contains("vt"s)) {
+            using insert_texcoord_data_t = std::function<void()>;
+
+            const auto &texcoord_data = scan_data.category_map.at("vt"s);
+            for (const auto &texcoord_index : face_data.index_texcoord_set) {
+                std::array<FloatType, 3> texcoord_coordinates;
+                const auto &texcoord_line_index = texcoord_data.at(texcoord_index);
+                const auto &texcoord_line = scan_data.line_data.at(texcoord_line_index);
+
+                decltype(texcoord_line.find_first_of(' ')) number_begin_pos = 3, number_end_pos;
+                std::size_t texcoord_coordinate_index = 0;
+                while (number_begin_pos < texcoord_line.size()) {
+                    if (texcoord_coordinate_index >= 3) {
+                        throw parse_error(std::format(
+                            "[{}]: {}",
+                            texcoord_line_index,
+                            std::format("Line \"{}\" must contain maximum {} numbers", "vt", 3)
+                        ));
+                    }
+                    number_end_pos = std::min(texcoord_line.find_first_of(' ', number_begin_pos), texcoord_line.size());
+                    auto [number_end, conversion_error] = std::from_chars(
+                        texcoord_line.data() + number_begin_pos,
+                        texcoord_line.data() + number_end_pos,
+                        texcoord_coordinates[texcoord_coordinate_index++],
+                        std::chars_format::fixed
+                    );
+                    if (conversion_error != std::errc() || texcoord_line.data() + number_end_pos != number_end) {
+                        throw parse_error(std::format(
+                            "[{}]: {}",
+                            texcoord_line_index,
+                            std::format("Unable to parse \"{}\" floating point value", "vt")
+                        ));
+                    }
+                    number_begin_pos = std::min(texcoord_line.find_first_not_of(' ', number_end_pos), texcoord_line.size());
+                }
+                if (texcoord_coordinate_index == 0) [[unlikely]] {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        texcoord_line_index,
+                        std::format("Unable to parse \"{}\" line: expected minimum one number", "vt")
+                    ));
+                }
+                if (result.texture_coordinates.valueless_by_exception() || result.texture_coordinates.index() == 0) [[unlikely]] {
+                    if (texcoord_coordinate_index == 1) {
+                        result.texture_coordinates = std::map<file_line_t, FloatType>{};
+                    } else if (texcoord_coordinate_index == 2) {
+                        result.texture_coordinates = std::map<file_line_t, std::array<FloatType, 2>>{};
+                    } else if (texcoord_coordinate_index == 3) {
+                        result.texture_coordinates = std::map<file_line_t, std::array<FloatType, 3>>{};
+                    } else {
+                        throw parse_error(std::format(
+                            "[{}]: {}",
+                            texcoord_line_index,
+                            std::format("Line \"{}\" must contain maximum {} numbers", "vt", 3)
+                        ));
+                    }
+                }
+                if (texcoord_coordinate_index == 0) [[unlikely]] {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        texcoord_line_index,
+                        std::format("Unable to parse \"{}\" line: expected minimum one number", "vt")
+                    ));
+                }
+                try {
+                    if (texcoord_coordinate_index == 1) {
+                        std::get<1>(result.texture_coordinates)[texcoord_line_index] = texcoord_coordinates[0];
+                    } else if (texcoord_coordinate_index == 2) {
+                        std::get<2>(result.texture_coordinates)[texcoord_line_index] = std::array<FloatType, 2>{texcoord_coordinates[0], texcoord_coordinates[1]};
+                    } else if (texcoord_coordinate_index == 3) {
+                        std::get<3>(result.texture_coordinates)[texcoord_line_index] = texcoord_coordinates;
+                    }
+                } catch (std::bad_variant_access&) {
+                    throw parse_error(std::format(
+                        "[{}]: {}",
+                        texcoord_line_index,
+                        std::format("Line \"{}\": {}D texture coordinates expected, got {}D texture coordinates", "vt", result.texture_coordinates.index(), texcoord_coordinate_index)
+                    ));
+                }
+            }
+        }
+        return result;
+    }
+
+    template<typename FloatType>
+    std::vector<FloatType> create_number_list(const coordinate_data_t<FloatType> &coordinate_data) {
+        numset_t<FloatType> number_set;
+
+        for (const auto& [line_number, coordinates] : coordinate_data.position_coordinates) {
+            for (const auto &coordinate : coordinates) {
+                number_set.emplace(coordinate);
+            }
+        }
+        for (const auto& [line_number, coordinates] : coordinate_data.normal_coordinates) {
+            for (const auto &coordinate : coordinates) {
+                number_set.emplace(coordinate);
+            }
+        }
+
+        std::visit([&](const auto &texture_coordinate_map) {
+            if constexpr (std::ranges::range<std::decay_t<decltype(texture_coordinate_map)>>) {
+                for (const auto& [line_number, coordinates] : texture_coordinate_map) {
+                    if constexpr (std::ranges::range<std::decay_t<decltype(coordinates)>>) {
+                        for (const auto &coordinate : coordinates) {
+                            number_set.emplace(coordinate);
+                        }
+                    } else {
+                        number_set.emplace(coordinates);
+                    }
+                }
+            }
+        }, coordinate_data.texture_coordinates);
+
+        number_set.emplace(std::numeric_limits<FloatType>::quiet_NaN());
+
+        std::vector<FloatType> number_list;
+        number_list.reserve(number_set.size());
+        std::copy(number_set.begin(), number_set.end(), std::back_inserter(number_list));
+
+        return number_list;
+    }
+
+    template<typename FloatType, typename IndexType>
+    coordinate_data_t<IndexType> create_coordinate_index(const coordinate_data_t<FloatType> &coordinate_data, const std::vector<FloatType> &float_list) {
+        coordinate_data_t<IndexType> coordinate_index_data;
+
+        static const auto float_compare = float_is_equal<FloatType>{};
+        static const auto float_less = less_with_nan_first_and_nearly_equal<FloatType>{};
+
+        for (const auto& [line_number, coordinates] : coordinate_data.position_coordinates) {
+            std::array<IndexType, coordinates.size()> position_coordinate_indices;
+            for (decltype(coordinates.size()) dim = 0; dim < coordinates.size(); ++dim) {
+                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
+                assert(iterator != float_list.end());
+                assert(float_compare(*iterator, coordinates[dim]));
+                auto index = std::distance(float_list.begin(), iterator);
+                assert(index != 0);
+                position_coordinate_indices[dim] = index;
+            }
+            coordinate_index_data.position_coordinates[line_number] = position_coordinate_indices;
+        }
+        for (const auto& [line_number, coordinates] : coordinate_data.normal_coordinates) {
+            std::array<IndexType, coordinates.size()> normal_coordinate_indices;
+            for (decltype(coordinates.size()) dim = 0; dim < coordinates.size(); ++dim) {
+                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
+                assert(iterator != float_list.end());
+                assert(float_compare(*iterator, coordinates[dim]));
+                auto index = std::distance(float_list.begin(), iterator);
+                assert(index != 0);
+                normal_coordinate_indices[dim] = index;
+            }
+            coordinate_index_data.normal_coordinates[line_number] = normal_coordinate_indices;
+        }
+        if (!coordinate_data.texture_coordinates.valueless_by_exception() && coordinate_data.texture_coordinates.index() > 0) {
+            std::visit([&](const auto &texture_coordinate_map) {
+                if constexpr (std::ranges::range<std::decay_t<decltype(texture_coordinate_map)>>) {
+                    if constexpr (std::ranges::range<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>) {
+                        coordinate_index_data.texture_coordinates = std::map<
+                            typename std::decay_t<decltype(texture_coordinate_map)>::key_type,
+                            std::array<
+                                IndexType,
+                                std::tuple_size_v<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>
+                            >
+                        >{};
+                    } else {
+                        coordinate_index_data.texture_coordinates = std::map<
+                            typename std::decay_t<decltype(texture_coordinate_map)>::key_type,
+                            IndexType
+                        >{};
+                    }
+                    for (const auto& [line_number, coordinates] : texture_coordinate_map) {
+                        if constexpr (std::ranges::range<std::decay_t<decltype(coordinates)>>) {
+                            std::array<IndexType, coordinates.size()> texcoord_coordinate_indices;
+                            for (std::size_t dim = 0; dim < coordinates.size(); ++dim) {
+                                auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates[dim], float_less);
+                                assert(iterator != float_list.end());
+                                assert(float_compare(*iterator, coordinates[dim]));
+                                auto index = std::distance(float_list.begin(), iterator);
+                                assert(index != 0);
+                                texcoord_coordinate_indices[dim] = index;
+                            }
+                            std::visit([&](auto &target_data) {
+                                if constexpr (std::is_same_v<
+                                    std::map<
+                                        file_line_t,
+                                        std::array<
+                                            IndexType,
+                                            std::tuple_size_v<typename std::decay_t<decltype(texture_coordinate_map)>::mapped_type>
+                                        >
+                                    >,
+                                    typename std::decay_t<decltype(target_data)>
+                                >) {
+                                    target_data[line_number] = texcoord_coordinate_indices;
+                                }
+                            }, coordinate_index_data.texture_coordinates);
+                        } else {
+                            auto iterator = std::lower_bound(float_list.begin(), float_list.end(), coordinates, float_less);
+                            assert(iterator != float_list.end());
+                            assert(float_compare(*iterator, coordinates));
+                            auto coordinate = std::distance(float_list.begin(), iterator);
+                            assert(coordinate != 0);
+                            std::visit([&](auto &target_data) {
+                                if constexpr (std::is_same_v<
+                                    std::map<file_line_t, IndexType>,
+                                    typename std::decay_t<decltype(target_data)>
+                                >) {
+                                    target_data[line_number] = coordinate;
+                                }
+                            }, coordinate_index_data.texture_coordinates);
+                        }
+                    }
+                }
+                int j = 0;
+            }, coordinate_data.texture_coordinates);
+        }
+
+        return coordinate_index_data;
+    }
+}
+
+#endif // __WAVEFRONT_PARSE_TPP__

src/scan.cpp

@@ -11,8 +11,6 @@
 #include "scan.hpp"
 
 namespace wavefront {
-    scan_error::scan_error(const std::string &message) : std::runtime_error(message) {}
-
     scan_result::scan_result() :
         total_lines(0),
         line_data(),

src/scan.hpp

@@ -10,11 +10,6 @@
 #include "settings.hpp"
 
 namespace wavefront {
-    class scan_error : public std::runtime_error {
-    public:
-        explicit scan_error(const std::string &message);
-    };
-
     struct scan_result {
         std::size_t total_lines;
         std::map<std::size_t, std::string> line_data;

src/trim.cpp

@@ -5,10 +5,10 @@ namespace wavefront {
         auto start = source.data();
         // size is the size of buffer, data() + size() is the first available byte after the string.
         auto end = source.data() + source.size() - 1;
-        while (start < end && std::isspace(*start)) {
+        while (start <= end && std::isspace(*start)) {
             ++start;
         }
-        while (start < end && (std::isspace(*end) || *end == 0)) {
+        while (start <= end && (std::isspace(*end) || *end == 0)) {
             --end;
         }
         return std::string_view(start, end - start + 1);

test.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+cmake -S . -B build/Debug -DCMAKE_BUILD_TYPE=Debug
+cmake --build build/Debug --config Debug
+ctest --test-dir build/Debug --output-on-failure

tests/data/test-scan-1.txt

@@ -0,0 +1,26 @@
+# Command
+
+v 0.1 0.2 0.3
+v 0.2 0.3 0.4
+v 0.3 0.4 0.5
+v 1.1 1.2 1.3
+v 1.2 1.3 1.4
+v 1.3 1.4 1.5
+v 2.1 2.2 2.3
+v 2.2 2.3 2.4
+v 2.3 2.4 2.5
+vn 0.15 0.25 0.35
+vn 0.25 0.35 0.45
+vn 0.35 0.45 0.55
+vt 0.9 0.8
+vt 0.8 0.7
+f 1/1/1 2/2/2 3/3/2
+o test
+f 4/3/2 5/2/1 6/1/2
+g test
+f 7/2/2 8/3/2 9/1/1
+o
+f 8/1/1 5/2/2 3/3/2
+g
+f 2/1/1 6/2/2 4/3/2
+h this line is skipped

tests/unit/parse_test.cpp

@@ -0,0 +1,129 @@
+#include <variant>
+
+#include <gtest/gtest.h>
+
+#include "parse.hpp"
+#include "scan.hpp"
+
+namespace {
+    TEST(ParseFaceData, BuildsTrianglesAndIndexSets) {
+        wavefront::scan_result scan_result;
+        scan_result.total_lines = 26;
+        scan_result.line_data = {
+            {17u, "f 1/1/1 2/2/2 3/3/2"},
+            {19u, "f 4/3/2 5/2/1 6/1/2"},
+            {21u, "f 7/2/2 8/3/2 9/1/1"},
+            {23u, "f 8/1/1 5/2/2 3/3/2"},
+            {25u, "f 2/1/1 6/2/2 4/3/2"}
+        };
+        scan_result.category_map = {
+            {"f", {17u, 19u, 21u, 23u, 25u}}
+        };
+
+        const auto face_data = wavefront::parse_face_data(scan_result);
+
+        EXPECT_EQ(face_data.triangle_list.size(), 5u);
+
+        EXPECT_EQ(face_data.index_position_set.size(), 9u);
+        EXPECT_TRUE(face_data.index_position_set.contains(1));
+        EXPECT_TRUE(face_data.index_position_set.contains(9));
+
+        EXPECT_EQ(face_data.index_normal_set.size(), 2u);
+        EXPECT_TRUE(face_data.index_normal_set.contains(1));
+        EXPECT_TRUE(face_data.index_normal_set.contains(2));
+
+        EXPECT_EQ(face_data.index_texcoord_set.size(), 3u);
+        EXPECT_TRUE(face_data.index_texcoord_set.contains(1));
+        EXPECT_TRUE(face_data.index_texcoord_set.contains(3));
+
+        const auto &first_triangle = face_data.triangle_list.at(0);
+        EXPECT_EQ(first_triangle[0].face_line_number, 17u);
+        EXPECT_EQ(first_triangle[0].position_index, 1);
+        EXPECT_EQ(first_triangle[0].texcoord_index, 1);
+        EXPECT_EQ(first_triangle[0].normal_index, 1);
+    }
+
+    TEST(ParseCoordinateData, MapsCoordinatesWithoutParsingFaces) {
+        wavefront::scan_result scan_result;
+        scan_result.total_lines = 26;
+        scan_result.line_data = {
+            {3u, "v 0.1 0.2 0.3"},
+            {4u, "v 0.2 0.3 0.4"},
+            {5u, "v 0.3 0.4 0.5"},
+            {6u, "v 1.1 1.2 1.3"},
+            {7u, "v 1.2 1.3 1.4"},
+            {8u, "v 1.3 1.4 1.5"},
+            {9u, "v 2.1 2.2 2.3"},
+            {10u, "v 2.2 2.3 2.4"},
+            {11u, "v 2.3 2.4 2.5"},
+            {12u, "vn 0.15 0.25 0.35"},
+            {13u, "vn 0.25 0.35 0.45"},
+            {14u, "vn 0.35 0.45 0.55"},
+            {15u, "vt 0.9 0.8"},
+            {16u, "vt 0.8 0.7"},
+            {17u, "f 1/1/1 2/2/2 3/3/2"},
+            {19u, "f 4/3/2 5/2/1 6/1/2"},
+            {21u, "f 7/2/2 8/3/2 9/1/1"},
+            {23u, "f 8/1/1 5/2/2 3/3/2"},
+            {25u, "f 2/1/1 6/2/2 4/3/2"}
+        };
+        scan_result.category_map = {
+            {"v", {0u, 3u, 4u, 5u, 6u, 7u, 8u, 9u, 10u, 11u}},
+            {"vn", {0u, 12u, 13u, 14u}},
+            {"vt", {0u, 15u, 16u}},
+            {"f", {17u, 19u, 21u, 23u, 25u}}
+        };
+
+        wavefront::wavefront_face_data_result_t face_data;
+        face_data.index_position_set = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+        face_data.index_normal_set = {1, 2, 3};
+        face_data.index_texcoord_set = {1, 2};
+        face_data.triangle_list = {
+            {{{17u, 1, 1, 1}, {17u, 2, 2, 2}, {17u, 3, 3, 2}}},
+            {{{19u, 4, 3, 2}, {19u, 5, 2, 1}, {19u, 6, 1, 2}}},
+            {{{21u, 7, 2, 2}, {21u, 8, 3, 2}, {21u, 9, 1, 1}}},
+            {{{23u, 8, 1, 1}, {23u, 5, 2, 2}, {23u, 3, 3, 2}}},
+            {{{25u, 2, 1, 1}, {25u, 6, 2, 2}, {25u, 4, 3, 2}}}
+        };
+
+        const auto coordinate_data = wavefront::parse_coordinate_data<float>(scan_result, face_data);
+
+        ASSERT_EQ(coordinate_data.position_coordinates.size(), 9u);
+        const auto &pos_line_2 = coordinate_data.position_coordinates.at(3u);
+        EXPECT_FLOAT_EQ(pos_line_2[0], 0.1f);
+        EXPECT_FLOAT_EQ(pos_line_2[1], 0.2f);
+        EXPECT_FLOAT_EQ(pos_line_2[2], 0.3f);
+
+        const auto &pos_line_5 = coordinate_data.position_coordinates.at(6u);
+        EXPECT_FLOAT_EQ(pos_line_5[0], 1.1f);
+        EXPECT_FLOAT_EQ(pos_line_5[1], 1.2f);
+        EXPECT_FLOAT_EQ(pos_line_5[2], 1.3f);
+
+        const auto &pos_line_10 = coordinate_data.position_coordinates.at(11u);
+        EXPECT_FLOAT_EQ(pos_line_10[0], 2.3f);
+        EXPECT_FLOAT_EQ(pos_line_10[1], 2.4f);
+        EXPECT_FLOAT_EQ(pos_line_10[2], 2.5f);
+
+        ASSERT_EQ(coordinate_data.normal_coordinates.size(), 3u);
+        const auto &normal_line_11 = coordinate_data.normal_coordinates.at(12u);
+        EXPECT_FLOAT_EQ(normal_line_11[0], 0.15f);
+        EXPECT_FLOAT_EQ(normal_line_11[1], 0.25f);
+        EXPECT_FLOAT_EQ(normal_line_11[2], 0.35f);
+
+        const auto &normal_line_13 = coordinate_data.normal_coordinates.at(14u);
+        EXPECT_FLOAT_EQ(normal_line_13[0], 0.35f);
+        EXPECT_FLOAT_EQ(normal_line_13[1], 0.45f);
+        EXPECT_FLOAT_EQ(normal_line_13[2], 0.55f);
+
+        ASSERT_EQ(coordinate_data.texture_coordinates.index(), 2u);
+        const auto &texcoords = std::get<2>(coordinate_data.texture_coordinates);
+        ASSERT_EQ(texcoords.size(), 2u);
+        const auto &tex_line_14 = texcoords.at(15u);
+        EXPECT_FLOAT_EQ(tex_line_14[0], 0.9f);
+        EXPECT_FLOAT_EQ(tex_line_14[1], 0.8f);
+
+        const auto &tex_line_15 = texcoords.at(16u);
+        EXPECT_FLOAT_EQ(tex_line_15[0], 0.8f);
+        EXPECT_FLOAT_EQ(tex_line_15[1], 0.7f);
+    }
+}

tests/unit/scan_test.cpp

@@ -0,0 +1,64 @@
+#include <filesystem>
+#include <fstream>
+
+#include <gtest/gtest.h>
+
+#include "scan.hpp"
+
+namespace {
+    std::filesystem::path test_data_path(const std::string &filename) {
+        const auto here = std::filesystem::path(__FILE__).parent_path();
+        return here.parent_path() / "data" / filename;
+    }
+
+    TEST(Scan, ReadsAllSupportedTypes) {
+        std::ifstream input(test_data_path("test-scan-1.txt"));
+        ASSERT_TRUE(input.is_open());
+
+        const auto result = wavefront::scan(input);
+
+        EXPECT_EQ(result.total_lines, 26u);
+        EXPECT_EQ(result.line_data.size(), 21u);
+
+        EXPECT_TRUE(result.category_map.contains("v"));
+        EXPECT_TRUE(result.category_map.contains("vn"));
+        EXPECT_TRUE(result.category_map.contains("vt"));
+        EXPECT_TRUE(result.category_map.contains("f"));
+
+        EXPECT_EQ(result.category_map.at("v").size(), 10u);
+        EXPECT_EQ(result.category_map.at("vn").size(), 4u);
+        EXPECT_EQ(result.category_map.at("vt").size(), 3u);
+        EXPECT_EQ(result.category_map.at("f").size(), 5u);
+    }
+
+    TEST(Scan, FiltersByObject) {
+        std::ifstream input(test_data_path("test-scan-1.txt"));
+        ASSERT_TRUE(input.is_open());
+
+        const auto result = wavefront::scan(input, {"test"});
+
+        EXPECT_EQ(result.category_map.at("f").size(), 4u);
+        EXPECT_EQ(result.category_map.at("f")[0], 19u);
+        EXPECT_EQ(result.category_map.at("f")[1], 21u);
+    }
+
+    TEST(Scan, FiltersByGroup) {
+        std::ifstream input(test_data_path("test-scan-1.txt"));
+        ASSERT_TRUE(input.is_open());
+
+        const auto result = wavefront::scan(input, {}, {"test"});
+
+        EXPECT_EQ(result.category_map.at("f").size(), 3u);
+        EXPECT_EQ(result.category_map.at("f")[0], 21u);
+    }
+
+    TEST(Scan, FiltersByObjectAndGroup) {
+        std::ifstream input(test_data_path("test-scan-1.txt"));
+        ASSERT_TRUE(input.is_open());
+
+        const auto result = wavefront::scan(input, {"test"}, {"test"});
+
+        EXPECT_EQ(result.category_map.at("f").size(), 3u);
+        EXPECT_EQ(result.category_map.at("f")[0], 21u);
+    }
+}

tests/unit/settings_test.cpp

@@ -0,0 +1,186 @@
+#include <filesystem>
+#include <fstream>
+#include <random>
+#include <sstream>
+#include <string>
+
+#include <gtest/gtest.h>
+
+#include "settings.hpp"
+
+namespace {
+    class ScopedFileCleanup {
+    public:
+        explicit ScopedFileCleanup(std::filesystem::path path) : path_(std::move(path)) {}
+        ScopedFileCleanup(const ScopedFileCleanup &) = delete;
+        ScopedFileCleanup &operator=(const ScopedFileCleanup &) = delete;
+        ScopedFileCleanup(ScopedFileCleanup &&) = delete;
+        ScopedFileCleanup &operator=(ScopedFileCleanup &&) = delete;
+        ~ScopedFileCleanup() {
+            if (!path_.empty()) {
+                std::error_code error;
+                std::filesystem::remove(path_, error);
+            }
+        }
+
+    private:
+        std::filesystem::path path_;
+    };
+
+    std::string random_token(std::size_t length) {
+        static const char charset[] =
+            "0123456789"
+            "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+            "abcdefghijklmnopqrstuvwxyz";
+        std::string result;
+        result.reserve(length);
+
+        std::mt19937 engine{std::random_device{}()};
+        std::uniform_int_distribution<std::size_t> dist(0, sizeof(charset) - 2);
+        for (std::size_t i = 0; i < length; ++i) {
+            result.push_back(charset[dist(engine)]);
+        }
+        return result;
+    }
+
+    TEST(SettingsBuilder, DefaultsToStdStreamsAndFlagsOff) {
+        wavefront::SettingsBuilder builder;
+
+        EXPECT_EQ(&builder.input(), &std::cin);
+        EXPECT_EQ(&builder.output(), &std::cout);
+        EXPECT_FALSE(builder.with_normals());
+        EXPECT_FALSE(builder.with_texcoords());
+        EXPECT_FALSE(builder.use_float64());
+
+        wavefront::Settings settings = builder.build();
+
+        EXPECT_EQ(&settings.input(), &std::cin);
+        EXPECT_EQ(&settings.output(), &std::cout);
+        EXPECT_FALSE(settings.extract_normals());
+        EXPECT_FALSE(settings.extract_texcoords());
+        EXPECT_FALSE(settings.use_float64());
+        EXPECT_TRUE(settings.selected_objects().empty());
+        EXPECT_TRUE(settings.selected_groups().empty());
+    }
+
+    TEST(SettingsBuilder, AppliesConfigurationAndSelection) {
+        std::istringstream input("dummy");
+        std::ostringstream output;
+
+        wavefront::SettingsBuilder builder;
+        builder.input(input)
+               .output(output)
+               .with_normals(true)
+               .with_texcoords(true)
+               .use_float64(true);
+        builder.selected_objects().push_back("object_a");
+        builder.selected_groups().push_back("group_a");
+
+        EXPECT_EQ(&builder.input(), &input);
+        EXPECT_EQ(&builder.output(), &output);
+        EXPECT_TRUE(builder.with_normals());
+        EXPECT_TRUE(builder.with_texcoords());
+        EXPECT_TRUE(builder.use_float64());
+
+        wavefront::Settings settings = builder.build();
+
+        EXPECT_EQ(&settings.input(), &input);
+        EXPECT_EQ(&settings.output(), &output);
+        EXPECT_TRUE(settings.extract_normals());
+        EXPECT_TRUE(settings.extract_texcoords());
+        EXPECT_TRUE(settings.use_float64());
+        ASSERT_EQ(settings.selected_objects().size(), 1u);
+        EXPECT_EQ(settings.selected_objects()[0], "object_a");
+        ASSERT_EQ(settings.selected_groups().size(), 1u);
+        EXPECT_EQ(settings.selected_groups()[0], "group_a");
+    }
+
+    TEST(SettingsBuilder, CanOpenFileFromString) {
+        const auto temp_dir = std::filesystem::temp_directory_path();
+        const auto token = random_token(12);
+        const auto input_path = temp_dir / std::filesystem::path("dragiyski-wavefront-parser-test-settings-input-" + token + ".txt");
+        const auto output_path = temp_dir / std::filesystem::path("dragiyski-wavefront-parser-test-settings-output-" + token + ".txt");
+        const ScopedFileCleanup input_cleanup(input_path);
+        const ScopedFileCleanup output_cleanup(output_path);
+
+        {
+            std::ofstream seed(input_path);
+            seed << token;
+        }
+
+        wavefront::SettingsBuilder builder;
+        builder.input(input_path.string())
+               .output(output_path.string());
+
+        wavefront::Settings settings = builder.build();
+
+        EXPECT_NE(&settings.input(), &std::cin);
+        EXPECT_NE(&settings.output(), &std::cout);
+
+        auto *input_stream = dynamic_cast<std::ifstream *>(&settings.input());
+        ASSERT_NE(input_stream, nullptr);
+        EXPECT_TRUE(input_stream->is_open());
+
+        std::string input_contents;
+        *input_stream >> input_contents;
+        EXPECT_EQ(input_contents, token);
+
+        auto *output_stream = dynamic_cast<std::ofstream *>(&settings.output());
+        ASSERT_NE(output_stream, nullptr);
+        EXPECT_TRUE(output_stream->is_open());
+
+        *output_stream << token;
+        output_stream->flush();
+
+        std::ifstream verify(output_path);
+        std::string output_contents;
+        verify >> output_contents;
+        EXPECT_EQ(output_contents, token);
+    }
+
+    TEST(SettingsBuilder, CanOpenFileFromMovedStreams) {
+        const auto temp_dir = std::filesystem::temp_directory_path();
+        const auto token = random_token(12);
+        const auto input_path = temp_dir / std::filesystem::path("dragiyski-wavefront-parser-test-settings-input-move-" + token + ".txt");
+        const auto output_path = temp_dir / std::filesystem::path("dragiyski-wavefront-parser-test-settings-output-move-" + token + ".txt");
+        const ScopedFileCleanup input_cleanup(input_path);
+        const ScopedFileCleanup output_cleanup(output_path);
+
+        {
+            std::ofstream seed(input_path);
+            seed << token;
+        }
+
+        std::ifstream input_stream(input_path);
+        std::ofstream output_stream(output_path);
+
+        wavefront::SettingsBuilder builder;
+        builder.input(std::move(input_stream))
+               .output(std::move(output_stream));
+
+        wavefront::Settings settings = builder.build();
+
+        EXPECT_NE(&settings.input(), &std::cin);
+        EXPECT_NE(&settings.output(), &std::cout);
+
+        auto *input_file = dynamic_cast<std::ifstream *>(&settings.input());
+        ASSERT_NE(input_file, nullptr);
+        EXPECT_TRUE(input_file->is_open());
+
+        std::string input_contents;
+        *input_file >> input_contents;
+        EXPECT_EQ(input_contents, token);
+
+        auto *output_file = dynamic_cast<std::ofstream *>(&settings.output());
+        ASSERT_NE(output_file, nullptr);
+        EXPECT_TRUE(output_file->is_open());
+
+        *output_file << token;
+        output_file->flush();
+
+        std::ifstream verify(output_path);
+        std::string output_contents;
+        verify >> output_contents;
+        EXPECT_EQ(output_contents, token);
+    }
+}

tests/unit/trim_test.cpp

@@ -0,0 +1,36 @@
+#include <string>
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "trim.hpp"
+
+namespace {
+    using ::testing::StrEq;
+
+    struct TrimCase {
+        const char *source;
+        const char *expected;
+    };
+
+    class TrimTest : public ::testing::TestWithParam<TrimCase> {
+    };
+
+    TEST_P(TrimTest, ReturnsTrimmedString) {
+        const auto &param = GetParam();
+        std::string_view result = wavefront::trim(param.source);
+        EXPECT_THAT(std::string(result), StrEq(param.expected));
+    }
+
+    INSTANTIATE_TEST_SUITE_P(
+        TrimCases,
+        TrimTest,
+        ::testing::Values(
+            TrimCase{"   hello world   ", "hello world"},
+            TrimCase{"\t\n  spaced\t\n", "spaced"},
+            TrimCase{"trimmed", "trimmed"},
+            TrimCase{"   ", ""},
+            TrimCase{"", ""}
+        )
+    );
+}