Produce fatal error when #else is used outside an #if

riiengineering · Feb 8, 2024 · cfd34bf · cfd34bf
1 parent 386ed5f
commit cfd34bf
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diff --git a/test/29-else-outside-if/expect.err b/test/29-else-outside-if/expect.err
@@ -0,0 +1 @@
+test/29-else-outside-if/input:1: error: #else can only be used within an #if
diff --git a/test/29-else-outside-if/expect.status b/test/29-else-outside-if/expect.status
@@ -0,0 +1 @@
+1
diff --git a/test/29-else-outside-if/input b/test/29-else-outside-if/input
@@ -0,0 +1,3 @@
+#else
+else
+#endif
diff --git a/ygpp b/ygpp
@@ -303,6 +303,10 @@ function eval_input(p_name,    _iname, _res, _x) {
 	} else if (_iname == "ifndef") {
 		p_push(p_name, "if", !isdef($2))
 	} else if (_iname == "else") {
+		if ("if" != p_last(p_name, "type")) {
+			fatal("#else can only be used within an #if")
+		}
+
 		p_set(p_name, !p_last(p_name))
 	} else if (_iname == "endif") {
 		p_pop(p_name, "if")