Harmony: implement Math.trunc.

test/mjsunit/harmony/math-trunc.js

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-// Segment plain Chinese sentence and check results.
+// Flags: --harmony-maths
 
-var iterator = new Intl.v8BreakIterator(['zh']);
-
-var textToSegment = '\u56FD\u52A1\u9662\u5173\u4E8E\u300A\u571F\u5730' +
-                    '\u623F\u5C4B\u7BA1\u7406\u6761\u4F8B\u300B';
-iterator.adoptText(textToSegment);
-
-var slices = [];
-var types = [];
-var pos = iterator.first();
-while (pos !== -1) {
-  var nextPos = iterator.next();
-  if (nextPos === -1) break;
-
-  slices.push(textToSegment.slice(pos, nextPos));
-  types.push(iterator.breakType());
-
-  pos = nextPos;
-}
-
-assertEquals('\u56FD\u52A1\u9662', slices[0]);
-assertEquals('\u5173\u4E8E', slices[1]);
-assertEquals('\u300A', slices[2]);
-assertEquals('\u571F\u5730', slices[3]);
-assertEquals('\u623F\u5C4B', slices[4]);
-assertEquals('\u7BA1\u7406', slices[5]);
-assertEquals('\u6761\u4F8B', slices[6]);
-assertEquals('\u300B', slices[7]);
-
-assertEquals('ideo', types[0]);
-assertEquals('ideo', types[1]);
-assertEquals('none', types[2]);
-assertEquals('ideo', types[3]);
-assertEquals('ideo', types[4]);
-assertEquals('none', types[types.length - 1]);
+assertEquals("Infinity", String(1/Math.trunc(0)));
+assertEquals("-Infinity", String(1/Math.trunc(-0)));

[Dmitry Lomov (no reviews), 2013/10/21 07:01:28]

Get -0 in some "cleverer" way here, otherwise it might be optimized "at parse
time".

+assertEquals("Infinity", String(1/Math.trunc(Math.PI/4)));
+assertEquals("-Infinity", String(1/Math.trunc(-Math.sqrt(2)/2)));
+assertEquals(100, Math.trunc(100));
+assertEquals(-199, Math.trunc(-199));
+assertEquals(100, Math.trunc(100.1));
+assertTrue(isNaN(Math.trunc("abc")));
+assertTrue(isNaN(Math.trunc({})));
+assertEquals(0, Math.trunc([]));
+assertEquals(1, Math.trunc([1]));
+assertEquals(-100, Math.trunc([-100.1]));
+assertTrue(isNaN(Math.trunc([1, 1])));
+assertEquals(-100, Math.trunc({ toString: function() { return "-100.3"; } }));
+assertEquals(10, Math.trunc({ toString: function() { return 10.1; } }));
+assertEquals(-1, Math.trunc({ valueOf: function() { return -1.1; } }));
+assertEquals("-Infinity",
+             String(1/Math.trunc({ valueOf: function() { return "-0.1"; } })));
+assertEquals("-Infinity", String(Math.trunc(-Infinity)));
+assertEquals("Infinity", String(Math.trunc(Infinity)));
+assertEquals("-Infinity", String(Math.trunc("-Infinity")));
+assertEquals("Infinity", String(Math.trunc("Infinity")));