Add SQL parser foundation: core types, arena, tokenizer, classifier

.gitignore

@@ -42,3 +42,6 @@ src/*_parser/*_lexer.yy.c
 src/*_parser/*_parser.output
 src/*_parser/*_parser.report
 
+# New parser build artifacts
+libsqlparser.a
+run_tests

Makefile.new

@@ -0,0 +1,58 @@
+CXX = g++
+CXXFLAGS = -std=c++17 -Wall -Wextra -g -O2
+CPPFLAGS = -I./include -I./third_party/googletest/googletest/include
+
+PROJECT_ROOT = .
+SRC_DIR = $(PROJECT_ROOT)/src/sql_parser
+INCLUDE_DIR = $(PROJECT_ROOT)/include/sql_parser
+TEST_DIR = $(PROJECT_ROOT)/tests
+
+# Library sources
+LIB_SRCS = $(SRC_DIR)/arena.cpp $(SRC_DIR)/parser.cpp
+LIB_OBJS = $(LIB_SRCS:.cpp=.o)
+LIB_TARGET = $(PROJECT_ROOT)/libsqlparser.a
+
+# Google Test library
+GTEST_DIR = $(PROJECT_ROOT)/third_party/googletest/googletest
+GTEST_SRC = $(GTEST_DIR)/src/gtest-all.cc
+GTEST_OBJ = $(GTEST_DIR)/src/gtest-all.o
+GTEST_CPPFLAGS = -I$(GTEST_DIR)/include -I$(GTEST_DIR)
+
+# Test sources
+TEST_SRCS = $(TEST_DIR)/test_main.cpp \
+            $(TEST_DIR)/test_arena.cpp \
+            $(TEST_DIR)/test_tokenizer.cpp \
+            $(TEST_DIR)/test_classifier.cpp
+TEST_OBJS = $(TEST_SRCS:.cpp=.o)
+TEST_TARGET = $(PROJECT_ROOT)/run_tests
+
+.PHONY: all lib test clean
+
+all: lib test
+
+lib: $(LIB_TARGET)
+
+$(LIB_TARGET): $(LIB_OBJS)
+	ar rcs $@ $^
+	@echo "Built $@"
+
+$(SRC_DIR)/%.o: $(SRC_DIR)/%.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -c $< -o $@
+
+# Google Test object
+$(GTEST_OBJ): $(GTEST_SRC)
+	$(CXX) $(CXXFLAGS) $(GTEST_CPPFLAGS) -c $< -o $@
+
+# Test objects
+$(TEST_DIR)/%.o: $(TEST_DIR)/%.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(GTEST_CPPFLAGS) -c $< -o $@
+
+test: $(TEST_TARGET)
+	./$(TEST_TARGET)
+
+$(TEST_TARGET): $(TEST_OBJS) $(GTEST_OBJ) $(LIB_TARGET)
+	$(CXX) $(CXXFLAGS) -o $@ $(TEST_OBJS) $(GTEST_OBJ) -L$(PROJECT_ROOT) -lsqlparser -lpthread
+
+clean:
+	rm -f $(LIB_OBJS) $(LIB_TARGET) $(TEST_OBJS) $(GTEST_OBJ) $(TEST_TARGET)
+	@echo "Cleaned."