delete parser generator. let's try recursive descent

CMakeLists.txt

@@ -21,7 +21,6 @@ include_directories(
 )
 
 set(GRAMMAR_TXT "${CMAKE_BINARY_DIR}/simple.txt")
-set(PARSER_GENERATED_CPP "${CMAKE_BINARY_DIR}/parser_generated.cpp")
 
 set(ZIG_SOURCES
     "${CMAKE_SOURCE_DIR}/src/buffer.cpp"
@@ -30,13 +29,6 @@ set(ZIG_SOURCES
     "${CMAKE_SOURCE_DIR}/src/parser.cpp"
     "${CMAKE_SOURCE_DIR}/src/tokenizer.cpp"
     "${CMAKE_SOURCE_DIR}/src/util.cpp"
-    ${PARSER_GENERATED_CPP}
-)
-
-set(PARSERGEN_SOURCES
-    "${CMAKE_SOURCE_DIR}/src/parsergen.cpp"
-    "${CMAKE_SOURCE_DIR}/src/util.cpp"
-    "${CMAKE_SOURCE_DIR}/src/buffer.cpp"
 )
 
 set(CONFIGURE_OUT_FILE "${CMAKE_BINARY_DIR}/config.h")
@@ -63,15 +55,3 @@ target_link_libraries(zig LINK_PUBLIC
 )
 install(TARGETS zig DESTINATION bin)
 
-add_executable(parsergen ${PARSERGEN_SOURCES})
-set_target_properties(parsergen PROPERTIES
-    LINKER_LANGUAGE C
-    COMPILE_FLAGS ${EXE_CFLAGS})
-
-
-add_custom_command(
-    OUTPUT ${PARSER_GENERATED_CPP}
-    COMMAND parsergen ARGS ${GRAMMAR_TXT} ${PARSER_GENERATED_CPP}
-    DEPENDS ${GRAMMAR_TXT} ${PARSERGEN_SOURCES}
-    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
-)