[PP] error directive

src/include/PreProcessor.hpp

@@ -147,8 +147,8 @@ struct PreProcessor {
     void include_directive();
     void undef_directive();
     void line_directive();
+    void error_directive();
     // void pragma_directive(PPToken& token); // TODO:
-    // void error_directive(PPToken& token); // TODO:
 };
 
 } // namespace WasmVM

src/lib/PreProcessor/PreProcessor.cpp

@@ -124,7 +124,7 @@ PreProcessor::PPToken PreProcessor::get(){
                 }else if(direcitve_name == "line"){
                     line_directive();
                 }else if(direcitve_name == "error"){
-                    // TODO:
+                    error_directive();
                 }else if(direcitve_name == "pragma"){
                     // TODO:
                 }else if(direcitve_name == "include"){
@@ -365,3 +365,16 @@ void PreProcessor::line_directive(){
         throw Exception::Exception("expected header name in #include");
     }
 }
+
+void PreProcessor::error_directive(){
+    Line::iterator cur = skip_whitespace(line.begin(), line.end());
+    SourcePos pos = cur->value().pos;
+    std::stringstream message;
+    while(cur != line.end() && !cur->hold<TokenType::NewLine>()){
+        if(cur->has_value()){
+            message << cur->value();
+        }
+        cur = std::next(cur);
+    }
+    throw Exception::Error(pos, message.str());
+}

test/pp_directive/error.c

@@ -0,0 +1 @@
+#error test error

test/pp_directive/pp_directive.cpp

@@ -209,4 +209,8 @@ Suite pp_directive {
         Expect(((TokenType::PPNumber)token.value()).sequence == "3");
         pp.get();
     })
+    Test("error", {
+        PreProcessor pp(std::filesystem::path("error.c"));
+        Throw(Exception::Exception, pp.get());
+    })
 };