Add m-esr52 at 52.6.0

1 files changed, 634 insertions, 0 deletions

diff --git a/accessible/tests/mochitest/text.js b/accessible/tests/mochitest/text.js
new file mode 100644
index 000000000..a91ea9acc
--- /dev/null
+++ b/accessible/tests/mochitest/text.js
@@ -0,0 +1,634 @@
+////////////////////////////////////////////////////////////////////////////////
+// Public
+
+const BOUNDARY_CHAR = nsIAccessibleText.BOUNDARY_CHAR;
+const BOUNDARY_WORD_START = nsIAccessibleText.BOUNDARY_WORD_START;
+const BOUNDARY_WORD_END = nsIAccessibleText.BOUNDARY_WORD_END;
+const BOUNDARY_LINE_START = nsIAccessibleText.BOUNDARY_LINE_START;
+const BOUNDARY_LINE_END = nsIAccessibleText.BOUNDARY_LINE_END;
+
+const kTextEndOffset = nsIAccessibleText.TEXT_OFFSET_END_OF_TEXT;
+const kCaretOffset = nsIAccessibleText.TEXT_OFFSET_CARET;
+
+const EndPoint_Start = nsIAccessibleTextRange.EndPoint_Start;
+const EndPoint_End = nsIAccessibleTextRange.EndPoint_End;
+
+const kTodo = 1; // a test is expected to fail
+const kOk = 2; // a test doesn't fail
+
+/**
+ * Test characterCount for the given array of accessibles.
+ *
+ * @param aCount    [in] the expected character count
+ * @param aIDs      [in] array of accessible identifiers to test
+ * @param aTodoFlag [in, optional] either kOk or kTodo
+ */
+function testCharacterCount(aIDs, aCount, aTodoFlag)
+{
+  var ids = (aIDs instanceof Array) ? aIDs : [ aIDs ];
+  var isFunc = (aTodoFlag == kTodo) ? todo_is : is;
+  for (var i = 0; i < ids.length; i++) {
+    var textacc = getAccessible(ids[i], [nsIAccessibleText]);
+    isFunc(textacc.characterCount, aCount,
+           "Wrong character count for " + prettyName(ids[i]));
+  }
+}
+
+/**
+ * Test text between two given offsets.
+ *
+ * @param aIDs          [in] an array of accessible IDs to test
+ * @param aStartOffset  [in] the start offset within the text to test
+ * @param aEndOffset    [in] the end offset up to which the text is tested
+ * @param aText         [in] the expected result from the test
+ * @param aTodoFlag     [in, optional] either kOk or kTodo
+ */
+function testText(aIDs, aStartOffset, aEndOffset, aText, aTodoFlag)
+{
+  var ids = (aIDs instanceof Array) ? aIDs : [ aIDs ];
+  var isFunc = (aTodoFlag == kTodo) ? todo_is : is;
+  for (var i = 0; i < ids.length; i++) {
+    var acc = getAccessible(ids[i], nsIAccessibleText);
+    try {
+      isFunc(acc.getText(aStartOffset, aEndOffset), aText,
+             "getText: wrong text between start and end offsets '" +
+             aStartOffset + "', '" + aEndOffset + " for '" +
+             prettyName(ids[i]) + "'");
+    } catch (e) {
+      ok(false,
+        "getText fails between start and end offsets '" + aStartOffset +
+        "', '" + aEndOffset + " for '" + prettyName(ids[i]) + "'");
+    }
+  }
+}
+
+/**
+ * Test password text between two given offsets
+ *
+ * @param aIDs          [in] an array of accessible IDs to test
+ * @param aStartOffset  [in] the start offset within the text to test
+ * @param aEndOffset    [in] the end offset up to which the text is tested
+ * @param aText         [in] the expected result from the test
+ *
+ * @note  All this function does is test that getText doe snot expose the
+ *        password text itself, but something else.
+ */
+function testPasswordText(aIDs, aStartOffset, aEndOffset, aText)
+{
+  for (var i = 0; i < aIDs.length; i++)
+  {
+    var acc = getAccessible(aIDs[i], nsIAccessibleText);
+    try {
+      isnot(acc.getText(aStartOffset, aEndOffset), aText,
+         "getText: plain text between start and end offsets '" + aStartOffset +
+         "', '" + aEndOffset + " for '" + prettyName(aIDs[i]) + "'");
+    } catch (e) {
+      ok(false,
+         "getText fails between start and end offsets '" + aStartOffset +
+         "', '" + aEndOffset + " for '" + prettyName(aIDs[i]) + "'");
+    }
+  }
+}
+
+/**
+ * Test getTextAtOffset for BOUNDARY_CHAR over different elements.
+ *
+ * @param aIDs          [in] the accessible identifier or array of accessible
+ *                        identifiers
+ * @param aOffset       [in] the offset to get a character at it
+ * @param aChar         [in] the expected character
+ * @param aStartOffset  [in] expected start offset of the character
+ * @param aEndOffset    [in] expected end offset of the character
+ */
+function testCharAtOffset(aIDs, aOffset, aChar, aStartOffset, aEndOffset)
+{
+  var IDs = (aIDs instanceof Array) ? aIDs : [ aIDs ];
+  for (var i = 0; i < IDs.length; i++) {
+    var acc = getAccessible(IDs[i], nsIAccessibleText);
+    testTextHelper(IDs[i], aOffset, BOUNDARY_CHAR,
+                   aChar, aStartOffset, aEndOffset,
+                   kOk, kOk, kOk,
+                   acc.getTextAtOffset, "getTextAtOffset ");
+  }
+}
+
+/**
+ * Test getTextAtOffset function over different elements.
+ *
+ * @param aIDs            [in] ID or array of IDs
+ * @param aBoundaryType   [in] boundary type for text to be retrieved
+ * @param aTestList       [in] array of sets:
+ *                              offset1 and offset2 defining the offset range
+ *                              the text in the range
+ *                              start offset of the text in the range
+ *                              end offset of the text in the range
+ *
+ * or
+ *
+ * @param aOffset         [in] the offset to get the text at
+ * @param aBoundaryType   [in] Boundary type for text to be retrieved
+ * @param aText           [in] expected return text for getTextAtOffset
+ * @param aStartOffset    [in] expected return start offset for getTextAtOffset
+ * @param aEndOffset      [in] expected return end offset for getTextAtOffset
+ * @param ...             [in] list of ids or list of tuples made of:
+ *                              element identifier
+ *                              kTodo or kOk for returned text
+ *                              kTodo or kOk for returned start offset
+ *                              kTodo or kOk for returned offset result
+ */
+function testTextAtOffset()
+{
+  testTextSuperHelper("getTextAtOffset", arguments);
+}
+
+/**
+ * Test getTextAfterOffset for BOUNDARY_CHAR over different elements.
+ *
+ * @param aIDs          [in] the accessible identifier or array of accessible
+ *                        identifiers
+ * @param aOffset       [in] the offset to get a character after it
+ * @param aChar         [in] the expected character
+ * @param aStartOffset  [in] expected start offset of the character
+ * @param aEndOffset    [in] expected end offset of the character
+ */
+function testCharAfterOffset(aIDs, aOffset, aChar, aStartOffset, aEndOffset)
+{
+  var IDs = (aIDs instanceof Array) ? aIDs : [ aIDs ];
+  for (var i = 0; i < IDs.length; i++) {
+    var acc = getAccessible(IDs[i], nsIAccessibleText);
+    testTextHelper(IDs[i], aOffset, BOUNDARY_CHAR,
+                   aChar, aStartOffset, aEndOffset,
+                   kOk, kOk, kOk,
+                   acc.getTextAfterOffset, "getTextAfterOffset ");
+  }
+}
+
+/**
+ * Test getTextAfterOffset function over different elements
+ *
+ * @param aIDs            [in] ID or array of IDs
+ * @param aBoundaryType   [in] boundary type for text to be retrieved
+ * @param aTestList       [in] array of sets:
+ *                              offset1 and offset2 defining the offset range
+ *                              the text in the range
+ *                              start offset of the text in the range
+ *                              end offset of the text in the range
+ *
+ * or
+ *
+ * @param aOffset         [in] the offset to get the text after
+ * @param aBoundaryType   [in] Boundary type for text to be retrieved
+ * @param aText           [in] expected return text for getTextAfterOffset
+ * @param aStartOffset    [in] expected return start offset for getTextAfterOffset
+ * @param aEndOffset      [in] expected return end offset for getTextAfterOffset
+ * @param ...             [in] list of ids or list of tuples made of:
+ *                              element identifier
+ *                              kTodo or kOk for returned text
+ *                              kTodo or kOk for returned start offset
+ *                              kTodo or kOk for returned offset result
+ */
+function testTextAfterOffset(aOffset, aBoundaryType,
+                             aText, aStartOffset, aEndOffset)
+{
+  testTextSuperHelper("getTextAfterOffset", arguments);
+}
+
+/**
+ * Test getTextBeforeOffset for BOUNDARY_CHAR over different elements.
+ *
+ * @param aIDs          [in] the accessible identifier or array of accessible
+ *                        identifiers
+ * @param aOffset       [in] the offset to get a character before it
+ * @param aChar         [in] the expected character
+ * @param aStartOffset  [in] expected start offset of the character
+ * @param aEndOffset    [in] expected end offset of the character
+ */
+function testCharBeforeOffset(aIDs, aOffset, aChar, aStartOffset, aEndOffset)
+{
+  var IDs = (aIDs instanceof Array) ? aIDs : [ aIDs ];
+  for (var i = 0; i < IDs.length; i++) {
+    var acc = getAccessible(IDs[i], nsIAccessibleText);
+    testTextHelper(IDs[i], aOffset, BOUNDARY_CHAR,
+                   aChar, aStartOffset, aEndOffset,
+                   kOk, kOk, kOk,
+                   acc.getTextBeforeOffset, "getTextBeforeOffset ");
+  }
+}
+
+/**
+ * Test getTextBeforeOffset function over different elements
+ *
+ * @param aIDs            [in] ID or array of IDs
+ * @param aBoundaryType   [in] boundary type for text to be retrieved
+ * @param aTestList       [in] array of sets:
+ *                              offset1 and offset2 defining the offset range
+ *                              the text in the range
+ *                              start offset of the text in the range
+ *                              end offset of the text in the range
+ *
+ * or
+ *
+ * @param aOffset         [in] the offset to get the text before
+ * @param aBoundaryType   [in] Boundary type for text to be retrieved
+ * @param aText           [in] expected return text for getTextBeforeOffset
+ * @param aStartOffset    [in] expected return start offset for getTextBeforeOffset
+ * @param aEndOffset      [in] expected return end offset for getTextBeforeOffset
+ * @param ...             [in] list of ids or list of tuples made of:
+ *                              element identifier
+ *                              kTodo or kOk for returned text
+ *                              kTodo or kOk for returned start offset
+ *                              kTodo or kOk for returned offset result
+ */
+function testTextBeforeOffset(aOffset, aBoundaryType,
+                              aText, aStartOffset, aEndOffset)
+{
+  testTextSuperHelper("getTextBeforeOffset", arguments);
+}
+
+/**
+ * Test word count for an element.
+ *
+ * @param aElement   [in] element identifier
+ * @param aCount     [in] Expected word count
+ * @param aToDoFlag  [in] kTodo or kOk for returned text
+ */
+function testWordCount(aElement, aCount, aToDoFlag)
+{
+  var isFunc = (aToDoFlag == kTodo) ? todo_is : is;
+  var acc = getAccessible(aElement, nsIAccessibleText);
+  var startOffsetObj = {}, endOffsetObj = {};
+  var length = acc.characterCount;
+  var offset = 0;
+  var wordCount = 0;
+  while (true) {
+    var text = acc.getTextAtOffset(offset, BOUNDARY_WORD_START,
+                                   startOffsetObj, endOffsetObj);
+    if (offset >= length)
+      break;
+
+    wordCount++;
+    offset = endOffsetObj.value;
+  }
+  isFunc(wordCount, aCount,
+        "wrong words count for '" + acc.getText(0, -1) + "': " + wordCount +
+        " in " + prettyName(aElement));
+}
+
+/**
+ * Test word at a position for an element.
+ *
+ * @param aElement    [in] element identifier
+ * @param aWordIndex  [in] index of the word to test
+ * @param aText       [in] expected text for that word
+ * @param aToDoFlag   [in] kTodo or kOk for returned text
+ */
+function testWordAt(aElement, aWordIndex, aText, aToDoFlag)
+{
+  var isFunc = (aToDoFlag == kTodo) ? todo_is : is;
+  var acc = getAccessible(aElement, nsIAccessibleText);
+
+  var textLength = acc.characterCount;
+  var wordIdx = aWordIndex;
+  var startOffsetObj = { value: 0 }, endOffsetObj = { value: 0 };
+  for (offset = 0; offset < textLength; offset = endOffsetObj.value) {
+    acc.getTextAtOffset(offset, BOUNDARY_WORD_START,
+                        startOffsetObj, endOffsetObj);
+
+    wordIdx--;
+    if (wordIdx < 0)
+      break;
+  }
+
+  if (wordIdx >= 0) {
+    ok(false,
+       "the given word index '" + aWordIndex + "' exceeds words amount in " +
+       prettyName(aElement));
+
+    return;
+  }
+
+  var startWordOffset = startOffsetObj.value;
+  var endWordOffset = endOffsetObj.value;
+
+  // Calculate the end word offset.
+  acc.getTextAtOffset(endOffsetObj.value, BOUNDARY_WORD_END,
+                      startOffsetObj, endOffsetObj);
+  if (startOffsetObj.value != textLength)
+    endWordOffset = startOffsetObj.value
+
+  if (endWordOffset <= startWordOffset) {
+    todo(false,
+         "wrong start and end offset for word at index '" + aWordIndex + "': " +
+         " of text '" + acc.getText(0, -1) + "' in " + prettyName(aElement));
+
+    return;
+  }
+
+  text = acc.getText(startWordOffset, endWordOffset);
+  isFunc(text, aText,  "wrong text for word at index '" + aWordIndex + "': " +
+         " of text '" + acc.getText(0, -1) + "' in " + prettyName(aElement));
+}
+
+/**
+ * Test words in a element.
+ *
+ * @param aElement   [in]           element identifier
+ * @param aWords     [in]           array of expected words
+ * @param aToDoFlag  [in, optional] kTodo or kOk for returned text
+ */
+function testWords(aElement, aWords, aToDoFlag)
+{
+  if (aToDoFlag == null)
+    aToDoFlag = kOk;
+
+  testWordCount(aElement, aWords.length, aToDoFlag);
+
+  for (var i = 0; i < aWords.length; i++) {
+    testWordAt(aElement, i, aWords[i], aToDoFlag);
+  }
+}
+
+/**
+ * Remove all selections.
+ *
+ * @param aID  [in] Id, DOM node, or acc obj
+ */
+function cleanTextSelections(aID)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+
+  while (acc.selectionCount > 0)
+    acc.removeSelection(0);
+}
+
+/**
+ * Test addSelection method.
+ *
+ * @param aID               [in] Id, DOM node, or acc obj
+ * @param aStartOffset      [in] start offset for the new selection
+ * @param aEndOffset        [in] end offset for the new selection
+ * @param aSelectionsCount  [in] expected number of selections after addSelection
+ */
+function testTextAddSelection(aID, aStartOffset, aEndOffset, aSelectionsCount)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+  var text = acc.getText(0, -1);
+
+  acc.addSelection(aStartOffset, aEndOffset);
+
+  ok(acc.selectionCount, aSelectionsCount,
+     text + ": failed to add selection from offset '" + aStartOffset +
+     "' to offset '" + aEndOffset + "': selectionCount after");
+}
+
+/**
+ * Test removeSelection method.
+ *
+ * @param aID               [in] Id, DOM node, or acc obj
+ * @param aSelectionIndex   [in] index of the selection to be removed
+ * @param aSelectionsCount  [in] expected number of selections after
+ *                               removeSelection
+ */
+function testTextRemoveSelection(aID, aSelectionIndex, aSelectionsCount)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+  var text = acc.getText(0, -1);
+
+  acc.removeSelection(aSelectionIndex);
+
+  ok(acc.selectionCount, aSelectionsCount,
+     text + ": failed to remove selection at index '" +
+     aSelectionIndex + "': selectionCount after");
+}
+
+/**
+ * Test setSelectionBounds method.
+ *
+ * @param aID               [in] Id, DOM node, or acc obj
+ * @param aStartOffset      [in] new start offset for the selection
+ * @param aEndOffset        [in] new end offset for the selection
+ * @param aSelectionIndex   [in] index of the selection to set
+ * @param aSelectionsCount  [in] expected number of selections after
+ *                               setSelectionBounds
+ */
+function testTextSetSelection(aID, aStartOffset, aEndOffset,
+                              aSelectionIndex, aSelectionsCount)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+  var text = acc.getText(0, -1);
+
+  acc.setSelectionBounds(aSelectionIndex, aStartOffset, aEndOffset);
+
+  is(acc.selectionCount, aSelectionsCount,
+     text + ": failed to set selection at index '" +
+     aSelectionIndex + "': selectionCount after");
+}
+
+/**
+ * Test selectionCount method.
+ *
+ * @param aID        [in] Id, DOM node, or acc obj
+ * @param aCount     [in] expected selection count
+ */
+function testTextSelectionCount(aID, aCount)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+  var text = acc.getText(0, -1);
+
+  is(acc.selectionCount, aCount, text + ": wrong selectionCount: ");
+}
+
+/**
+ * Test getSelectionBounds method.
+ *
+ * @param aID              [in] Id, DOM node, or acc obj
+ * @param aStartOffset     [in] expected start offset for the selection
+ * @param aEndOffset       [in] expected end offset for the selection
+ * @param aSelectionIndex  [in] index of the selection to get
+ */
+function testTextGetSelection(aID, aStartOffset, aEndOffset, aSelectionIndex)
+{
+  var acc = getAccessible(aID, [nsIAccessibleText]);
+  var text = acc.getText(0, -1);
+
+  var startObj = {}, endObj = {};
+  acc.getSelectionBounds(aSelectionIndex, startObj, endObj);
+
+  is(startObj.value, aStartOffset, text + ": wrong start offset for index '" +
+     aSelectionIndex + "'");
+  is(endObj.value, aEndOffset, text + ": wrong end offset for index '" +
+     aSelectionIndex + "'");
+}
+
+function testTextRange(aRange, aRangeDescr, aStartContainer, aStartOffset,
+                       aEndContainer, aEndOffset, aText,
+                       aCommonContainer, aChildren)
+{
+  isObject(aRange.startContainer, getAccessible(aStartContainer),
+           "Wrong start container of " + aRangeDescr);
+  is(aRange.startOffset, aStartOffset,
+     "Wrong start offset of " + aRangeDescr);
+  isObject(aRange.endContainer, getAccessible(aEndContainer),
+           "Wrong end container of " + aRangeDescr);
+  is(aRange.endOffset, aEndOffset,
+     "Wrong end offset of " + aRangeDescr);
+
+  if (aText === undefined) {
+    return;
+  }
+
+  is(aRange.text, aText, "Wrong text of " + aRangeDescr);
+
+  var children = aRange.embeddedChildren;
+  is(children ? children.length : 0, aChildren ? aChildren.length : 0,
+     "Wrong embedded children count of " + aRangeDescr);
+
+  isObject(aRange.container, getAccessible(aCommonContainer),
+           "Wrong container of " + aRangeDescr);
+
+  if (aChildren) {
+    for (var i = 0; i < aChildren.length; i++) {
+      var expectedChild = getAccessible(aChildren[i]);
+      var actualChild = children.queryElementAt(i, nsIAccessible);
+      isObject(actualChild, expectedChild,
+               "Wrong child at index '" + i + "' of " + aRangeDescr);
+    }
+  }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// Private
+
+function testTextSuperHelper(aFuncName, aArgs)
+{
+  // List of tests.
+  if (aArgs[2] instanceof Array) {
+    var ids = (aArgs[0] instanceof Array) ? aArgs[0] : [ aArgs[0] ];
+    var boundaryType = aArgs[1];
+    var list = aArgs[2];
+    for (var i = 0; i < list.length; i++) {
+      var offset1 = list[i][0], offset2 = list[i][1];
+      var text = list[i][2], startOffset = list[i][3], endOffset = list[i][4];
+      var failureList = list[i][5];
+      for (var offset = offset1; offset <= offset2; offset++) {
+        for (var idIdx = 0; idIdx < ids.length; idIdx++) {
+          var id = ids[idIdx];
+
+          var flagOk1 = kOk, flagOk2 = kOk, flagOk3 = kOk;
+          if (failureList) {
+            for (var fIdx = 0; fIdx < failureList.length; fIdx++) {
+              if (offset == failureList[fIdx][0] && id == failureList[fIdx][1]) {
+                flagOk1 = failureList[fIdx][2];
+                flagOk2 = failureList[fIdx][3];
+                flagOk3 = failureList[fIdx][4];
+                break;
+              }
+            }
+          }
+
+          var acc = getAccessible(id, nsIAccessibleText);
+          testTextHelper(id, offset, boundaryType,
+                         text, startOffset, endOffset,
+                         flagOk1, flagOk2, flagOk3,
+                         acc[aFuncName], aFuncName + " ");
+        }
+      }
+    }
+    return;
+  }
+
+  // Test at single offset. List of IDs.
+  var offset = aArgs[0];
+  var boundaryType = aArgs[1];
+  var text = aArgs[2];
+  var startOffset = aArgs[3];
+  var endOffset = aArgs[4];
+  if (aArgs[5] instanceof Array) {
+    var ids = aArgs[5];
+    for (var i = 0; i < ids.length; i++) {
+      var acc = getAccessible(ids[i], nsIAccessibleText);
+      testTextHelper(ids[i], offset, boundaryType,
+                     text, startOffset, endOffset,
+                     kOk, kOk, kOk,
+                     acc[aFuncName], aFuncName + " ");
+    }
+
+    return;
+  }
+
+  // Each ID is tested separately.
+  for (var i = 5; i < aArgs.length; i = i + 4) {
+    var ID = aArgs[i];
+    var acc = getAccessible(ID, nsIAccessibleText);
+    var toDoFlag1 = aArgs[i + 1];
+    var toDoFlag2 = aArgs[i + 2];
+    var toDoFlag3 = aArgs[i + 3];
+
+    testTextHelper(ID, offset, boundaryType,
+                   text, startOffset, endOffset,
+                   toDoFlag1, toDoFlag2, toDoFlag3,
+                   acc[aFuncName], aFuncName + " ");
+  }
+}
+
+function testTextHelper(aID, aOffset, aBoundaryType,
+                        aText, aStartOffset, aEndOffset,
+                        aToDoFlag1, aToDoFlag2, aToDoFlag3,
+                        aTextFunc, aTextFuncName)
+{
+  var exceptionFlag = aToDoFlag1 == undefined ||
+                      aToDoFlag2 == undefined ||
+                      aToDoFlag3 == undefined;
+
+  var startMsg = aTextFuncName + "(" + boundaryToString(aBoundaryType) + "): ";
+  var endMsg = ", id: " + prettyName(aID) + ";";
+
+  try {
+    var startOffsetObj = {}, endOffsetObj = {};
+    var text = aTextFunc(aOffset, aBoundaryType,
+                         startOffsetObj, endOffsetObj);
+
+    if (exceptionFlag) {
+      ok(false, startMsg + "no expected failure at offset " + aOffset + endMsg);
+      return;
+    }
+
+    var isFunc1 = (aToDoFlag1 == kTodo) ? todo : ok;
+    var isFunc2 = (aToDoFlag2 == kTodo) ? todo : ok;
+    var isFunc3 = (aToDoFlag3 == kTodo) ? todo : ok;
+
+    isFunc1(text == aText,
+            startMsg + "wrong text " +
+            "(got '" + text + "', expected: '" + aText + "')" +
+            ", offset: " + aOffset + endMsg);
+    isFunc2(startOffsetObj.value == aStartOffset,
+            startMsg + "wrong start offset" +
+            "(got '" + startOffsetObj.value + "', expected: '" + aStartOffset + "')" +
+            ", offset: " + aOffset + endMsg);
+    isFunc3(endOffsetObj.value == aEndOffset,
+            startMsg + "wrong end offset" +
+            "(got '" + endOffsetObj.value + "', expected: '" + aEndOffset + "')" +
+            ", offset: " + aOffset + endMsg);
+
+  } catch (e) {
+    var okFunc = exceptionFlag ? todo : ok;
+    okFunc(false, startMsg + "failed at offset " + aOffset + endMsg +
+           ", exception: " + e);
+  }
+}
+
+function boundaryToString(aBoundaryType)
+{
+  switch (aBoundaryType) {
+    case BOUNDARY_CHAR:
+      return "char";
+    case BOUNDARY_WORD_START:
+      return "word start";
+    case BOUNDARY_WORD_END:
+      return "word end";
+    case BOUNDARY_LINE_START:
+      return "line start";
+    case BOUNDARY_LINE_END:
+      return "line end";
+  }
+}