tor-browser

extend.js (7294B)

---

"use strict";

// Also test a selection with no ranges
testRanges.unshift("[]");

// Run a subset of all of extend tests.
// Huge number of tests in a single file causes problems. Each of
// extend-NN.html runs a part of them.
//
// startIndex - Start index in testRanges array
// optionalEndIndex - End index in testRanges array + 1. If this argument is
//     omitted, testRanges.length is applied.
function testExtendSubSet(startIndex, optionalEndIndex) {
   var endIndex = optionalEndIndex === undefined ? testRanges.length : optionalEndIndex;
   if (startIndex < 0 || startIndex >= testRanges.length)
       throw "Sanity check: Specified index is invalid.";
   if (endIndex < 0 || endIndex > testRanges.length)
       throw "Sanity check: Specified index is invalid.";

   // We test Selections that go both forwards and backwards here.  In the
   // latter case we need to use extend() to force it to go backwards, which is
   // fair enough, since that's what we're testing.  We test collapsed
   // selections only once.
   for (var i = startIndex; i < endIndex; i++) {
       var endpoints = eval(testRanges[i]);
       // We can't test extend() with unselectable endpoints.
       if (!isSelectableNode(endpoints[0]) || !isSelectableNode(endpoints[2]))
           continue;
       for (var j = 0; j < testPoints.length; j++) {
           if (endpoints[0] == endpoints[2]
           && endpoints[1] == endpoints[3]) {
               // Test collapsed selections only once
               test(function() {
                   setSelectionForwards(endpoints);
                   testExtend(endpoints, eval(testPoints[j]));
               }, "extend() with range " + i + " " + testRanges[i]
               + " and point " + j + " " + testPoints[j]);
           } else {
               test(function() {
                   setSelectionForwards(endpoints);
                   testExtend(endpoints, eval(testPoints[j]));
               }, "extend() forwards with range " + i + " " + testRanges[i]
               + " and point " + j + " " + testPoints[j]);

               test(function() {
                   setSelectionBackwards(endpoints);
                   testExtend(endpoints, eval(testPoints[j]));
               }, "extend() backwards with range " + i + " " + testRanges[i]
               + " and point " + j + " " + testPoints[j]);
           }
       }
   }
}

function testExtend(endpoints, target) {
   assert_equals(getSelection().rangeCount, endpoints.length/4,
       "Sanity check: rangeCount must be correct");

   var node = target[0];
   var offset = target[1];

   // "If node's root is not the document associated with the context object,
   // abort these steps."
   if (!document.contains(node)) {
       assertSelectionNoChange(function() {
           selection.extend(node, offset);
       });
       return;
   }

   // "If the context object's range is null, throw an InvalidStateError
   // exception and abort these steps."
   if (getSelection().rangeCount == 0) {
       assert_throws_dom("INVALID_STATE_ERR", function() {
           selection.extend(node, offset);
       }, "extend() when rangeCount is 0 must throw InvalidStateError");
       return;
   }

   assert_equals(getSelection().getRangeAt(0).startContainer, endpoints[0],
       "Sanity check: startContainer must be correct");
   assert_equals(getSelection().getRangeAt(0).startOffset, endpoints[1],
       "Sanity check: startOffset must be correct");
   assert_equals(getSelection().getRangeAt(0).endContainer, endpoints[2],
       "Sanity check: endContainer must be correct");
   assert_equals(getSelection().getRangeAt(0).endOffset, endpoints[3],
       "Sanity check: endOffset must be correct");

   // "Let anchor and focus be the context object's anchor and focus, and let
   // new focus be the boundary point (node, offset)."
   var anchorNode = getSelection().anchorNode;
   var anchorOffset = getSelection().anchorOffset;
   var focusNode = getSelection().focusNode;
   var focusOffset = getSelection().focusOffset;

   // "Let new range be a new range."
   //
   // We'll always be setting either new range's start or its end to new
   // focus, so we'll always throw at some point.  Test that now.
   //
   // From DOM4's "set the start or end of a range": "If node is a doctype,
   // throw an "InvalidNodeTypeError" exception and terminate these steps."
   if (node.nodeType == Node.DOCUMENT_TYPE_NODE) {
       assert_throws_dom("INVALID_NODE_TYPE_ERR", function() {
           selection.extend(node, offset);
       }, "extend() to a doctype must throw InvalidNodeTypeError");
       return;
   }

   // From DOM4's "set the start or end of a range": "If offset is greater
   // than node's length, throw an "IndexSizeError" exception and terminate
   // these steps."
   //
   // FIXME: We should be casting offset to an unsigned int per WebIDL.  Until
   // we do, we need the offset < 0 check too.
   if (offset < 0 || offset > getNodeLength(node)) {
       assert_throws_dom("INDEX_SIZE_ERR", function() {
           selection.extend(node, offset);
       }, "extend() to an offset that's greater than node length (" + getNodeLength(node) + ") must throw IndexSizeError");
       return;
   }

   // Now back to the editing spec.
   var originalRange = getSelection().getRangeAt(0);

   // "If node's root is not the same as the context object's range's root,
   // set new range's start and end to (node, offset)."
   //
   // "Otherwise, if anchor is before or equal to new focus, set new range's
   // start to anchor, then set its end to new focus."
   //
   // "Otherwise, set new range's start to new focus, then set its end to
   // anchor."
   //
   // "Set the context object's range to new range."
   //
   // "If new focus is before anchor, set the context object's direction to
   // backwards. Otherwise, set it to forwards."
   //
   // The upshot of all these is summed up by just testing the anchor and
   // offset.
   getSelection().extend(node, offset);

   if (furthestAncestor(anchorNode) == furthestAncestor(node)) {
       assert_equals(getSelection().anchorNode, anchorNode,
           "anchorNode must not change if the node passed to extend() has the same root as the original range");
       assert_equals(getSelection().anchorOffset, anchorOffset,
           "anchorOffset must not change if the node passed to extend() has the same root as the original range");
   } else {
       assert_equals(getSelection().anchorNode, node,
           "anchorNode must be the node passed to extend() if it has a different root from the original range");
       assert_equals(getSelection().anchorOffset, offset,
           "anchorOffset must be the offset passed to extend() if the node has a different root from the original range");
   }
   assert_equals(getSelection().focusNode, node,
       "focusNode must be the node passed to extend()");
   assert_equals(getSelection().focusOffset, offset,
       "focusOffset must be the offset passed to extend()");
   assert_not_equals(getSelection().getRangeAt(0), originalRange,
       "extend() must replace any existing range with a new one, not mutate the existing one");
}