Changeset: 38 Branch comment: [] Add infrastructure for codegen

12 files changed, 163 insertions, 3 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ad2bf16..3d349c5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,50 @@ add_subdirectory(3rdparty/imgui)
 add_subdirectory(3rdparty/imguicolortextedit)
 add_subdirectory(3rdparty/tracy)
 
+# ==============================================================================
+
+file(GLOB_RECURSE commonthings_SOURCES source-common/*.c source-common/*.cpp)
+add_library(commonthings OBJECT ${commonthings_SOURCES})
+
+set_target_properties(commonthings PROPERTIES
+	CXX_STANDARD 20
+	CXX_STANDARD_REQUIRED ON
+	CXX_EXTENSIONS OFF
+
+	# Many files include platform headers, we don't want to leak them - it's just simpler to disable unity build for everything
+	UNITY_BUILD OFF
+)
+
+target_include_directories(commonthings PUBLIC source-common)
+target_link_libraries(commonthings PUBLIC
+	# External dependencies
+	${CONAN_LIBS}
+	glm::glm
+)
+
+# ==============================================================================
+
+# NOTE: delibrately not recursive, see README.md in the folder for details
+file(GLOB meta_codegen_SOURCES buildtools/codegen/*.c buildtools/codegen/*.cpp)
+add_executable(meta_codegen ${meta_codegen_SOURCES})
+
+set_target_properties(meta_codegen PROPERTIES	
+	CXX_STANDARD 20
+	CXX_STANDARD_REQUIRED ON
+	CXX_EXTENSIONS OFF
+	UNITY_BUILD OFF
+)
+
+target_link_libraries(meta_codegen PRIVATE
+	# External dependencies
+	${CONAN_LIBS}
+
+	# Project internal components
+	commonthings
+)
+
+# ==============================================================================
+
 # add_executable requires at least one source file
 add_executable(${PROJECT_NAME} dummy.c)
 add_subdirectory(source)
@@ -20,8 +64,8 @@ set_target_properties(${PROJECT_NAME} PROPERTIES
 	UNITY_BUILD_UNIQUE_ID "${PROJECT_NAME}_UNITY_ID"
 )
 
-target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_20)
 set_target_properties(${PROJECT_NAME} PROPERTIES
+	CXX_STANDARD 20
 	CXX_STANDARD_REQUIRED ON
 	CXX_EXTENSIONS OFF
 )
@@ -37,6 +81,7 @@ target_include_directories(${PROJECT_NAME} PRIVATE
 )
 
 target_link_libraries(${PROJECT_NAME} PRIVATE
+	# External dependencies
 	${CONAN_LIBS}
 	OpenGL::GL
 	glfw
@@ -44,6 +89,9 @@ target_link_libraries(${PROJECT_NAME} PRIVATE
 	imgui
 	ImGuiColorTextEdit
 	tracy
+
+	# Project internal components
+	commonthings
 )
 
 option(BRUSSEL_ENABLE_PROFILING "Whether profiling support is enabled or not." OFF)
diff --git a/buildtools/codegen/README.md b/buildtools/codegen/README.md
new file mode 100644
index 0000000..7164132
--- /dev/null
+++ b/buildtools/codegen/README.md
@@ -0,0 +1,5 @@
+# Code Generator
+The main code generator.
+
+## Folder structure
+The main program's source files are all located in this folder directly. Text tempaltes are located in `templates/` and none of the files are compiled (even if they end with .c or .cpp).
diff --git a/buildtools/codegen/main.cpp b/buildtools/codegen/main.cpp
new file mode 100644
index 0000000..4a1d486
--- /dev/null
+++ b/buildtools/codegen/main.cpp
@@ -0,0 +1,102 @@
+#include "ScopeGuard.hpp"
+#include "Utils.hpp"
+
+#include <stb_c_lexer.h>
+#include <filesystem>
+#include <string>
+#include <string_view>
+
+using namespace std::literals;
+namespace fs = std::filesystem;
+
+enum InputOpcode {
+	IOP_ProcessSingleFile,
+	IOP_ProcessRecursively,
+	IOP_COUNT,
+};
+
+InputOpcode ParseInputOpcode(std::string_view text) {
+	if (text == "single"sv) {
+		return IOP_ProcessSingleFile;
+	} else if (text == "rec"sv) {
+		return IOP_ProcessRecursively;
+	}
+	return IOP_COUNT;
+}
+
+void HandleInputFile(std::string_view source) {
+	stb_lexer lexer;
+	char stringStorage[65536];
+	const char* srcBegin = source.data();
+	const char* srcEnd = srcBegin + source.length();
+	stb_c_lexer_init(&lexer, srcBegin, srcEnd, stringStorage, sizeof(stringStorage));
+
+	// TODO
+}
+
+std::string ReadFileAtOnce(const fs::path& path) {
+	auto file = Utils::OpenCstdioFile(path, Utils::Read);
+	if (!file) throw std::runtime_error("Failed to open source file.");
+	DEFER { fclose(file); };
+
+	fseek(file, 0, SEEK_END);
+	auto fileSize = ftell(file);
+	rewind(file);
+
+	std::string result(fileSize, '\0');
+	fread(result.data(), fileSize, 1, file);
+
+	return result;
+}
+
+void HandleArgument(InputOpcode opcode, std::string_view operand) {
+	switch (opcode) {
+		case IOP_ProcessSingleFile: {
+			fs::path filePath(operand);
+			auto source = ReadFileAtOnce(filePath);
+			HandleInputFile(source);
+		} break;
+
+		case IOP_ProcessRecursively: {
+			fs::path startPath(operand);
+			for (auto& item : fs::directory_iterator(startPath)) {
+				if (!item.is_regular_file()) {
+					continue;
+				}
+
+				auto& path = item.path();
+				auto filename = path.filename().string();
+				if (filename != ".c" ||
+					filename != ".cpp")
+				{
+					continue;
+				}
+
+				auto source = ReadFileAtOnce(path);
+				HandleInputFile(source);
+			}
+		} break;
+
+		case IOP_COUNT: break;
+	}
+}
+
+int main(int argc, char* argv[]) {
+	// TODO better arg parser
+	//      option 1: use cxxopts and positional arguments
+	//      option 1: take one argument only, being a json objecet
+
+	// If no cli is provided (argv[0]), this loop will do nothing
+	// Otherwise, start with the 2nd element which is the 1st argument
+	for (int i = 1; i < argc; ++i) {
+		std::string_view arg(argv[i]);
+		auto separatorLoc = arg.find(':');
+		if (separatorLoc != std::string_view::npos) {
+			auto opcode = ParseInputOpcode(arg.substr(0, separatorLoc));
+			auto operand = arg.substr(separatorLoc);
+			HandleArgument(opcode, operand);
+		}
+	}
+
+	return 0;
+}
diff --git a/source/Macros.hpp b/source-common/Macros.hpp
index b5d05fa..b5d05fa 100644
--- a/source/Macros.hpp
+++ b/source-common/Macros.hpp
diff --git a/source-common/MacrosCodegen.hpp b/source-common/MacrosCodegen.hpp
new file mode 100644
index 0000000..6c93d09
--- /dev/null
+++ b/source-common/MacrosCodegen.hpp
@@ -0,0 +1,4 @@
+#pragma once
+
+#define BRUSSEL_METACLASS
+#define BRUSSEL_METAENUM(name)
diff --git a/source/RapidJsonHelper.hpp b/source-common/RapidJsonHelper.hpp
index 75cd93a..75cd93a 100644
--- a/source/RapidJsonHelper.hpp
+++ b/source-common/RapidJsonHelper.hpp
diff --git a/source/ScopeGuard.hpp b/source-common/ScopeGuard.hpp
index 28f3385..28f3385 100644
--- a/source/ScopeGuard.hpp
+++ b/source-common/ScopeGuard.hpp
diff --git a/source/stb_implementation.c b/source-common/StbImplementations.c
index 078ca5d..73bbc2a 100644
--- a/source/stb_implementation.c
+++ b/source-common/StbImplementations.c
@@ -9,3 +9,6 @@
 
 #define STB_SPRINTF_IMPLEMENTATION
 #include <stb_sprintf.h>
+
+#define STB_C_LEXER_IMPLEMENTATION
+#include <stb_c_lexer.h>
diff --git a/source/Utils.cpp b/source-common/Utils.cpp
index 53b3863..53b3863 100644
--- a/source/Utils.cpp
+++ b/source-common/Utils.cpp
diff --git a/source/Utils.hpp b/source-common/Utils.hpp
index 9f28aad..9f28aad 100644
--- a/source/Utils.hpp
+++ b/source-common/Utils.hpp
diff --git a/source/YCombinator.hpp b/source-common/YCombinator.hpp
index b1d2350..b1d2350 100644
--- a/source/YCombinator.hpp
+++ b/source-common/YCombinator.hpp
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 6ca2cd5..b5de147 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -31,9 +31,7 @@ PRIVATE
 )
 
 set(ProjectBrussel_SINGLE_UNIT_SRC
-	stb_implementation.c
 	main.cpp
-	Utils.cpp # May include platform headers
 )
 target_sources(${PROJECT_NAME} PRIVATE ${ProjectBrussel_SINGLE_UNIT_SRC})
 set_source_files_properties(${ProjectBrussel_SINGLE_UNIT_SRC}