1 files changed, 161 insertions, 0 deletions
diff --git a/testing/web-platform/tests/selection/extend.js b/testing/web-platform/tests/selection/extend.js
new file mode 100644
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+++ b/testing/web-platform/tests/selection/extend.js
@@ -0,0 +1,161 @@
+"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");
+}