Abbreviate commonly used N3Util functions.

Author: RubenVerborgh

lib/util/SparqlExpressionEvaluator.js

@@ -13,6 +13,9 @@ var XSD = 'http://www.w3.org/2001/XMLSchema#',
 var evaluators, operators,
     UnsupportedExpressionError, UnsupportedOperatorError, InvalidArgumentsNumberError;
 
+var isLiteral = N3Util.isLiteral,
+    literalValue = N3Util.getLiteralValue;
+
 /**
  * Creates a function that evaluates the given SPARQL expression.
  * @constructor
@@ -87,11 +90,11 @@ evaluators = {
           // Convert the arguments if necessary
           switch (operator.type) {
           case 'numeric':
-            args[i] = parseFloat(N3Util.getLiteralValue(arg));
+            args[i] = parseFloat(literalValue(arg));
             break;
           case 'boolean':
             args[i] = arg !== XSD_FALSE &&
-                     (!N3Util.isLiteral(arg) || N3Util.getLiteralValue(arg) !== '0');
+                     (!isLiteral(arg) || literalValue(arg) !== '0');
             break;
           }
         }
@@ -136,17 +139,17 @@ operators = {
     return a.toLowerCase() === b.toLowerCase();
   },
   'contains': function (string, substring) {
-    substring = N3Util.getLiteralValue(substring);
-    string = N3Util.getLiteralValue(string);
+    substring = literalValue(substring);
+    string = literalValue(string);
     return string.indexOf(substring) >= 0;
   },
   'regex': function (subject, pattern) {
-    if (N3Util.isLiteral(subject))
-      subject = N3Util.getLiteralValue(subject);
-    return new RegExp(N3Util.getLiteralValue(pattern)).test(subject);
+    if (isLiteral(subject))
+      subject = literalValue(subject);
+    return new RegExp(literalValue(pattern)).test(subject);
   },
   'str': function (a) {
-    return N3Util.isLiteral(a) ? a : '"' + a + '"';
+    return isLiteral(a) ? a : '"' + a + '"';
   },
   'http://www.w3.org/2001/XMLSchema#integer': function (a) {
     return '"' + Math.floor(a) + '"^^http://www.w3.org/2001/XMLSchema#integer';