Ticket #48: error-compiler-directive.patch

Source/CobraParser.cobra

@@ -543 +543 @@
                 .expect('EOL')
                 # TODO: throw AssertException(SourceSite sourceSite, object[] expressions, object thiss, object info)
                 assert false, IdentifierExpr(token, 'throw')
+            on 'error'
+                # emit an optional message and throw an error, halting compilation
+                msgText = '%%error directive'
+                msg = .optional('STRING_SINGLE','STRING_DOUBLE') 
+                if msg
+                    msgText = msg.text[1:-1]
+                    print '%%> [msgText]' 
+                .throwError('Compilation stopped: "[msgText]"')
             on 'number'   # TODO: fix this to work on a per-file basis
                 # number 'decimal' | 'float' | 'float32' | 'float64'
                 typeName = .grab

Tests/820-errors/600-other/120-error-compiler-directive.cobra

@@ +1 @@
+# This tests %% error without message ends with Compilation stopped and default msg 
+
+%% error  # .error. Compilation stopped: "%%error directive" 
+class Program 
+    
+    def main is shared 
+        pass

Tests/820-errors/600-other/122-error-compiler-directive.cobra

@@ +1 @@
+# This tests %% error message ends with Compilation stopped and error msg 
+# Need also test that provided msg emitted but need TestifyRunner i/f for that 
+
+# following also emits %%> internal error
+%% error 'internal error' # .error. Compilation stopped: "internal error"
+class Program 
+    
+    def main is shared 
+        pass

Developer/IntermediateReleaseNotes.text

@@ -1 +1 @@
 Post 0.8
 
+* Added support for a new compiler directive 'error' that takes an optional message. 
+ When encountered in compilation of a source file it causes display of 
+ the mesage if any and stops compilation with an error.
+.code
+    %% error 'Cannot build this file till mondo-patch installed'
+    
 * Added support for "multi-arg assignment" which allows you to assign to a number of variables from contents of a list in one statement
 .code
     a,b,c = ['val1', 'val2', 'val3']