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}
-)

src/parser.cpp

@@ -79,8 +79,13 @@ void ast_print(AstNode *node, int indent) {
     }
 }
 
-AstNode *ast_create_root(Token *token) {
-    return nullptr;
+struct ParseContext {
+    Buf *buf;
+    AstNode *root;
+};
+
+AstNode *ast_create_root(void) {
+    zig_panic("TODO create root");
 }
 
 void ast_invalid_token_error(Buf *buf, Token *token) {
@@ -88,3 +93,17 @@ void ast_invalid_token_error(Buf *buf, Token *token) {
     buf_init_from_mem(&token_value, buf_ptr(buf) + token->start_pos, token->end_pos - token->start_pos);
     ast_error(token, "invalid token: '%s'", buf_ptr(&token_value));
 }
+
+void ast_parse_fn_decls(ParseContext *pc, ZigList<AstNode *> *fn_decls) {
+    zig_panic("TODO parse fn decls");
+}
+
+AstNode *ast_parse(Buf *buf, ZigList<Token> *tokens) {
+    ParseContext pc = {0};
+    pc.buf = buf;
+    pc.root = ast_create_root();
+
+    ast_parse_fn_decls(&pc, &pc.root->data.root.fn_decls);
+
+    return pc.root;
+}

src/parser.hpp

@@ -91,6 +91,6 @@ const char *node_type_str(NodeType node_type);
 
 void ast_print(AstNode *node, int indent);
 
-AstNode *ast_create_root(Token *token);
+AstNode *ast_create_root(void);
 
 #endif