Merge pull request #57 from MontiCore/rumpe-patch-1-1

Update StreamExpressions.mc4: Editorial changes

monticore-grammar/src/main/grammars/de/monticore/expressions/StreamExpressions.mc4

@@ -9,16 +9,19 @@ import de.monticore.expressions.ExpressionsBasis;
 /**
  * This grammar extends the available expressions with
  * special operations for streams as initially defined by 
- * Broy/Stoelen in [BS01] using the syntax from 
+ * Broy/Stoelen in [BS01] using the syntax style and
+ * function libraries from 
  * Ringert/Rumpe [RR11] and 
  * Buerger, Kausch, Raco, Ringert, Rumpe, Stueber, Wiartalla [BKR+20] 
  * (see https://www.se-rwth.de/publications/)
  *
  * Stream expressions are partly 
- * 1) extending the Expression syntax by grammatical operations (see below),
+ * 1) extending the MontiCore Expression syntax by new grammar 
+ *    constructs (see below),
  * 2) are provided as library of available Stream operations, and
- * 3) are based on the type constructors Stream<T>, EventStream<T>, SyncStream<T>,
- * ToptStream<T> (defined in Types)
+ * 3) are based on the type constructors 
+ *    Stream<T>, EventStream<T>, SyncStream<T>,
+ *    ToptStream<T> (defined in Types)
  *
  * The language developer may choose the subset of expressions
  * of interest and combine these with the appropriate typing infrastructure
@@ -47,7 +50,8 @@ component grammar StreamExpressions extends CommonExpressions {
    * the scanner recognizing timing keywords as names
    */
   StreamConstructorExpression implements Expression <360> =
-    ({noSpace(2)}? timing:[key("Event") | key("Sync") | key("Topt") | key("Untimed")])?
+    ({noSpace(2)}? 
+    timing:[key("Event") | key("Sync") | key("Topt") | key("Untimed")])?
     "<" (Expression || ",")* ">";
 
   /* 
@@ -63,7 +67,7 @@ component grammar StreamExpressions extends CommonExpressions {
     left:Expression operator:":" right:Expression;
 
   /*
-   * Concatenation of streams 
+   * Concatenation of two streams 
    * a^^b^^c  is equal to  a^^(b^^c),  hence <rightassoc>
    * (even so it is semantically associative)
    */
@@ -72,7 +76,7 @@ component grammar StreamExpressions extends CommonExpressions {
     left:Expression operator:"^^" right:Expression;
 
   /* 
-   * Length of stream 
+   * Length of a stream 
    */
   LengthStreamExpression implements Expression <185>
     = "#" Expression;