Simplify a few expressions to improve readability

Author: sungshik

rascal-textmate-core/src/main/rascal/lang/textmate/Conversion.rsc

@@ -55,7 +55,7 @@ RscGrammar preprocess(RscGrammar rsc) {
     // Replace occurrences of singleton ranges with just the corresponding
     // literal. This makes it easier to identify delimiters.
     return visit (rsc) {
-        case s: \char-class([range(char, char)]) => d
+        case \char-class([range(char, char)]) => d
             when d := \lit("<stringChar(char)>"), isDelimiter(d)
     }
 }
@@ -132,13 +132,14 @@ list[ConversionUnit] analyze(RscGrammar rsc) {
     list[Production] prodsKeywords = [prod(lex(KEYWORDS_PRODUCTION_NAME), [\alt(keywords)], {\tag("category"("keyword.control"))})];
 
     // Return
-    bool isEmptyProd(prod(_, [\alt(alternatives)], _)) = alternatives == {};
-    set[ConversionUnit] units
-        = {unit(rsc, p, false, hasNewline(rsc, p), getOuterDelimiterPair(rsc, p), getInnerDelimiterPair(rsc, p, getOnlyFirst = true)) | p <- prodsNonRecursive}
-        + {unit(rsc, p, true, hasNewline(rsc, p), getOuterDelimiterPair(rsc, p), getInnerDelimiterPair(rsc, p, getOnlyFirst = true)) | p <- prodsRecursive}
-        + {unit(rsc, p, false, false, <nothing(), nothing()>, <nothing(), nothing()>) | p <- prodsDelimiters, !isEmptyProd(p)}
-        + {unit(rsc, p, false, false, <nothing(), nothing()>, <nothing(), nothing()>) | p <- prodsKeywords, !isEmptyProd(p)};
-
+    bool isRecursive(Production p)
+        = p in prodsRecursive;
+    bool isEmptyProd(prod(_, [\alt(alternatives)], _))
+        = alternatives == {};
+    
+    set[ConversionUnit] units = {};
+    units += {unit(rsc, p, isRecursive(p), hasNewline(rsc, p), getOuterDelimiterPair(rsc, p), getInnerDelimiterPair(rsc, p, getOnlyFirst = true)) | p <- prods};
+    units += {unit(rsc, p, false, false, <nothing(), nothing()>, <nothing(), nothing()>) | p <- prodsDelimiters + prodsKeywords, !isEmptyProd(p)};
     return sort([*removeStrictPrefixes(units)]);
 }
 

rascal-textmate-core/src/main/rascal/lang/textmate/ConversionUnit.rsc

@@ -165,14 +165,8 @@ bool isStrictPrefix(ConversionUnit u1, ConversionUnit u2)
     = isStrictPrefix(u1.prod.symbols, u2.prod.symbols);
 
 // TODO: This function could be moved to a separate, generic module
-private bool isStrictPrefix([], [])
-    = false;
-private bool isStrictPrefix([], [_, *_])
-    = true;
-private bool isStrictPrefix([_, *_], [])
-    = false;
-private bool isStrictPrefix([head1, *tail1], [head2, *tail2])
-    = head1 == head2 && isStrictPrefix(tail1, tail2);
+private bool isStrictPrefix(list[&T] l1, list[&T] l2)
+    = size(l1) < size(l2) && !any(i <- [0..size(l1)], l1[i] != l2[i]);
 
 @synopsis{
     Representation of a *decomposition* of a list of units (i.e., the lists of