compiler, lexer: add NO_LEGACY define to disable legacy syntax features

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

3 files changed, 12 insertions, 1 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0dfa62a..1452631 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,8 @@ OPTION(MATH_SUPPORT "Math plugin support" ON)
 OPTION(UBUS_SUPPORT "Ubus plugin support" ON)
 OPTION(UCI_SUPPORT "UCI plugin support" ON)
 
+OPTION(LEGACY_SUPPORT "Support deprecated syntax features" ON)
+
 SET(LIB_SEARCH_PATH "/usr/lib/ucode/*.so:/usr/share/ucode/*.uc:./*.so:./*.uc" CACHE STRING "Default library search path")
 ADD_DEFINITIONS(-DLIB_SEARCH_PATH="${LIB_SEARCH_PATH}")
 
@@ -31,6 +33,10 @@ ELSE()
   ADD_DEFINITIONS(-DNDEBUG)
 ENDIF()
 
+IF(NOT LEGACY_SUPPORT)
+  ADD_DEFINITIONS(-DNO_LEGACY)
+ENDIF()
+
 INCLUDE(FindPkgConfig)
 PKG_CHECK_MODULES(JSONC json-c json)
 IF(JSONC_FOUND)
diff --git a/compiler.c b/compiler.c
index cf9ca25..5a9b579 100644
--- a/compiler.c
+++ b/compiler.c
@@ -974,6 +974,7 @@ uc_compiler_compile_delete(uc_compiler *compiler, bool assignable)
 	uc_chunk *chunk = uc_compiler_current_chunk(compiler);
 	enum insn_type type;
 
+#ifndef NO_LEGACY
 	/* If the delete keyword is followed by an opening paren, it might be a
 	 * legacy delete(object, propname) call */
 	if (uc_compiler_parse_match(compiler, TK_LPAREN)) {
@@ -1006,7 +1007,9 @@ uc_compiler_compile_delete(uc_compiler *compiler, bool assignable)
 
 	/* Otherwise compile expression, ensure that it results in a property
 	 * access (I_LVAL) and overwrite it with delete operation. */
-	else {
+	else
+#endif /* NO_LEGACY */
+	{
 		uc_compiler_parse_precedence(compiler, P_UNARY);
 
 		type = chunk->entries[compiler->last_insn];
diff --git a/lexer.c b/lexer.c
index 84af45d..cc35d66 100644
--- a/lexer.c
+++ b/lexer.c
@@ -145,7 +145,9 @@ static const struct keyword reserved_words[] = {
 	{ TK_RETURN,	"return", 6, { 0 } },
 	{ TK_ENDFOR,	"endfor", 6, { 0 } },
 	{ TK_SWITCH,	"switch", 6, { 0 } },
+#ifndef NO_LEGACY
 	{ TK_LOCAL,		"local", 5, { 0 } },
+#endif
 	{ TK_ENDIF,		"endif", 5, { 0 } },
 	{ TK_WHILE,		"while", 5, { 0 } },
 	{ TK_BREAK,		"break", 5, { 0 } },