Merge pull request #665 from Cormac-Williams/imp-fix

Add Fix function.

Author: cmontella

src/runtime/providers/math.ts

@@ -328,6 +328,13 @@ class Round extends ValueOnlyConstraint {
   }
 }
 
+class Fix extends ValueOnlyConstraint {
+  getReturnValue(args) {
+    let x = args[0];
+    return x - x % 1;
+  }
+}
+
 class ToFixed extends TotalFunctionConstraint {
   static AttributeMapping = {
     "value": 0,
@@ -476,6 +483,7 @@ providers.provide("pow", Pow);
 providers.provide("random", Random);
 providers.provide("range", Range);
 providers.provide("round", Round);
+providers.provide("fix", Fix);
 providers.provide("gaussian", Gaussian);
 providers.provide("to-fixed", ToFixed);
 

test/math.ts

@@ -214,12 +214,20 @@ let round_list : valueTest[]  = [
   ]
 testSingleExpressionByList(round_list);
 
-// Test Round Function
+// Test To Fixed Function
 let toFixed_list : valueTest[]  = [
   {expression: "to-fixed[ value: 1.499 places: 2 ]", expectedValue: 1.50},
   ]
 testSingleExpressionByList(toFixed_list );
 
+// Test Fix Function
+let Fix_list : valueTest[]  = [
+  {expression: "fix[ value: 1.99999999999999]", expectedValue: 1},
+  {expression: "fix[ value: -1.99999999999999]", expectedValue: -1},
+  ]
+testSingleExpressionByList(Fix_list );
+
+
 test("Test that string concatenation is still working after NaN change.", (assert) => {
   let expected = {
     insert: [