third_party/web_platform_tests/dom/ranges/Range-compareBoundaryPoints.html

<!doctype html>
<title>Range.compareBoundaryPoints() tests</title>
<link rel="author" title="Aryeh Gregor" href=ayg@aryeh.name>
<meta name=timeout content=long>

<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=../common.js></script>
<script>
"use strict";

var testRangesCached = [];
testRangesCached.push(document.createRange());
testRangesCached[0].detach();
for (var i = 0; i < testRangesShort.length; i++) {
  try {
    testRangesCached.push(rangeFromEndpoints(eval(testRangesShort[i])));
  } catch(e) {
    testRangesCached.push(null);
  }
}

var testRangesCachedClones = [];
testRangesCachedClones.push(document.createRange());
testRangesCachedClones[0].detach();
for (var i = 1; i < testRangesCached.length; i++) {
  if (testRangesCached[i]) {
    testRangesCachedClones.push(testRangesCached[i].cloneRange());
  } else {
    testRangesCachedClones.push(null);
  }
}

// We want to run a whole bunch of extra tests with invalid "how" values (not
// 0-3), but it's excessive to run them for every single pair of ranges --
// there are too many of them.  So just run them for a handful of the tests.
var extraTests = [0, // detached
  1 + testRanges.indexOf("[paras[0].firstChild, 2, paras[0].firstChild, 8]"),
  1 + testRanges.indexOf("[paras[0].firstChild, 3, paras[3], 1]"),
  1 + testRanges.indexOf("[testDiv, 0, comment, 5]"),
  1 + testRanges.indexOf("[foreignDoc.documentElement, 0, foreignDoc.documentElement, 1]")];

for (var i = 0; i < testRangesCached.length; i++) {
  var range1 = testRangesCached[i];
  var range1Desc = i + " " + (i == 0 ? "[detached]" : testRanges[i - 1]);
  for (var j = 0; j <= testRangesCachedClones.length; j++) {
    var range2;
    var range2Desc;
    if (j == testRangesCachedClones.length) {
      range2 = range1;
      range2Desc = "same as first range";
    } else {
      range2 = testRangesCachedClones[j];
      range2Desc = j + " " + (j == 0 ? "[detached]" : testRanges[j - 1]);
    }

    var hows = [Range.START_TO_START, Range.START_TO_END, Range.END_TO_END,
      Range.END_TO_START];
    if (extraTests.indexOf(i) != -1 && extraTests.indexOf(j) != -1) {
      // TODO: Make some type of reusable utility function to do this
      // work.
      hows.push(-1, 4, 5, NaN, -0, +Infinity, -Infinity);
      [65536, -65536, 65536*65536, 0.5, -0.5, -72.5].forEach(function(addend) {
        hows.push(-1 + addend, 0 + addend, 1 + addend,
          2 + addend, 3 + addend, 4 + addend);
      });
      hows.forEach(function(how) { hows.push(String(how)) });
      hows.push("6.5536e4", null, undefined, true, false, "", "quasit");
    }

    for (var k = 0; k < hows.length; k++) {
      var how = hows[k];
      test(function() {
        assert_not_equals(range1, null,
          "Creating context range threw an exception");
        assert_not_equals(range2, null,
          "Creating argument range threw an exception");

        // Convert how per WebIDL.  TODO: Make some type of reusable
        // utility function to do this work.
        // "Let number be the result of calling ToNumber on the input
        // argument."
        var convertedHow = Number(how);

        // "If number is NaN, +0, −0, +∞, or −∞, return +0."
        if (isNaN(convertedHow)
        || convertedHow == 0
        || convertedHow == Infinity
        || convertedHow == -Infinity) {
          convertedHow = 0;
        } else {
          // "Let posInt be sign(number) * floor(abs(number))."
          var posInt = (convertedHow < 0 ? -1 : 1) * Math.floor(Math.abs(convertedHow));

          // "Let int16bit be posInt modulo 2^16; that is, a finite
          // integer value k of Number type with positive sign and
          // less than 2^16 in magnitude such that the mathematical
          // difference of posInt and k is mathematically an integer
          // multiple of 2^16."
          //
          // "Return int16bit."
          convertedHow = posInt % 65536;
          if (convertedHow < 0) {
            convertedHow += 65536;
          }
        }

        // Now to the actual algorithm.
        // "If how is not one of
        //   START_TO_START,
        //   START_TO_END,
        //   END_TO_END, and
        //   END_TO_START,
        // throw a "NotSupportedError" exception and terminate these
        // steps."
        if (convertedHow != Range.START_TO_START
        && convertedHow != Range.START_TO_END
        && convertedHow != Range.END_TO_END
        && convertedHow != Range.END_TO_START) {
          assert_throws("NOT_SUPPORTED_ERR", function() {
            range1.compareBoundaryPoints(how, range2);
          }, "NotSupportedError required if first parameter doesn't convert to 0-3 per WebIDL");
          return;
        }

        // "If context object's root is not the same as sourceRange's
        // root, throw a "WrongDocumentError" exception and terminate
        // these steps."
        if (furthestAncestor(range1.startContainer) != furthestAncestor(range2.startContainer)) {
          assert_throws("WRONG_DOCUMENT_ERR", function() {
            range1.compareBoundaryPoints(how, range2);
          }, "WrongDocumentError required if the ranges don't share a root");
          return;
        }

        // "If how is:
        //   START_TO_START:
        //     Let this point be the context object's start.
        //     Let other point be sourceRange's start.
        //   START_TO_END:
        //     Let this point be the context object's end.
        //     Let other point be sourceRange's start.
        //   END_TO_END:
        //     Let this point be the context object's end.
        //     Let other point be sourceRange's end.
        //   END_TO_START:
        //     Let this point be the context object's start.
        //     Let other point be sourceRange's end."
        var thisPoint = convertedHow == Range.START_TO_START || convertedHow == Range.END_TO_START
          ? [range1.startContainer, range1.startOffset]
          : [range1.endContainer, range1.endOffset];
        var otherPoint = convertedHow == Range.START_TO_START || convertedHow == Range.START_TO_END
          ? [range2.startContainer, range2.startOffset]
          : [range2.endContainer, range2.endOffset];

        // "If the position of this point relative to other point is
        //   before
        //     Return −1.
        //   equal
        //     Return 0.
        //   after
        //     Return 1."
        var position = getPosition(thisPoint[0], thisPoint[1], otherPoint[0], otherPoint[1]);
        var expected;
        if (position == "before") {
          expected = -1;
        } else if (position == "equal") {
          expected = 0;
        } else if (position == "after") {
          expected = 1;
        }

        assert_equals(range1.compareBoundaryPoints(how, range2), expected,
          "Wrong return value");
      }, i + "," + j + "," + k + ": context range " + range1Desc + ", argument range " + range2Desc + ", how " + format_value(how));
    }
  }
}

testDiv.style.display = "none";
</script>