Implement xsd:integer.

Author: RubenVerborgh

lib/util/SparqlExpressionEvaluator.js

@@ -5,6 +5,7 @@ var N3Util = require('n3').Util,
 
 var XSD = 'http://www.w3.org/2001/XMLSchema#',
     XSD_INTEGER = XSD + 'integer',
+    XSD_DOUBLE  = XSD + 'double',
     XSD_BOOLEAN = XSD + 'boolean',
     XSD_TRUE  = '"true"^^'  + XSD_BOOLEAN,
     XSD_FALSE = '"false"^^' + XSD_BOOLEAN;
@@ -145,6 +146,9 @@ operators = {
   'str': function (a) {
     return N3Util.isLiteral(a) ? a : '"' + a + '"';
   },
+  'http://www.w3.org/2001/XMLSchema#integer': function (a) {
+    return '"' + Math.floor(a) + '"^^http://www.w3.org/2001/XMLSchema#integer';
+  },
   'http://www.w3.org/2001/XMLSchema#double': function (a) {
     a = a.toFixed();
     if (a.indexOf('.') < 0) a += '.0';
@@ -161,7 +165,7 @@ operators = {
 // TODO: Comparison operators can take simple literals and strings as well
 [
   '+', '-', '*', '/', '<', '<=', '>', '>=',
-  'http://www.w3.org/2001/XMLSchema#double',
+  XSD_INTEGER, XSD_DOUBLE,
 ].forEach(function (operatorName) {
   operators[operatorName].type = 'numeric';
 });

test/util/SparqlExpressionEvaluator-test.js

@@ -411,6 +411,18 @@ describe('SparqlExpressionEvaluator', function () {
       });
     });
 
+    describe('of the xsd:integer operator', function () {
+      var evaluator = SparqlExpressionEvaluator({
+        type: 'operation',
+        operator: 'http://www.w3.org/2001/XMLSchema#integer',
+        args: ['"123.67"'],
+      });
+
+      it('should return the literal as an integer', function () {
+        evaluator({}).should.equal('"123"^^http://www.w3.org/2001/XMLSchema#integer');
+      });
+    });
+
     describe('of the xsd:double operator', function () {
       var evaluator = SparqlExpressionEvaluator({
         type: 'operation',