From 20c5bfd22cadce1bfdab47a7c88cf559377f167b Mon Sep 17 00:00:00 2001
From: Martin Edenhofer <me@edenhofer.de>
Date: Mon, 19 Jan 2015 23:24:20 +0100
Subject: [PATCH] Improved text modules.

---
 .../app/lib/base/jquery.textmodule.js         |    1 +
 .../app/lib/base/rangy-textrange.js           | 1925 +++++++++++++++++
 2 files changed, 1926 insertions(+)
 create mode 100755 app/assets/javascripts/app/lib/base/rangy-textrange.js

diff --git a/app/assets/javascripts/app/lib/base/jquery.textmodule.js b/app/assets/javascripts/app/lib/base/jquery.textmodule.js
index cc955504e..f550cab41 100644
--- a/app/assets/javascripts/app/lib/base/jquery.textmodule.js
+++ b/app/assets/javascripts/app/lib/base/jquery.textmodule.js
@@ -191,6 +191,7 @@
 
   // set height of widget
   Plugin.prototype.movePosition = function() {
+    if (!this._position) return
     var height       = this.$element.height() + 20
     var widgetHeight = this.$widget.find('ul').height() //+ 60 // + height
     var top          = -( widgetHeight + height ) + this._position.top
diff --git a/app/assets/javascripts/app/lib/base/rangy-textrange.js b/app/assets/javascripts/app/lib/base/rangy-textrange.js
new file mode 100755
index 000000000..58d7528b5
--- /dev/null
+++ b/app/assets/javascripts/app/lib/base/rangy-textrange.js
@@ -0,0 +1,1925 @@
+/**
+ * Text range module for Rangy.
+ * Text-based manipulation and searching of ranges and selections.
+ *
+ * Features
+ *
+ * - Ability to move range boundaries by character or word offsets
+ * - Customizable word tokenizer
+ * - Ignores text nodes inside <script> or <style> elements or those hidden by CSS display and visibility properties
+ * - Range findText method to search for text or regex within the page or within a range. Flags for whole words and case
+ *   sensitivity
+ * - Selection and range save/restore as text offsets within a node
+ * - Methods to return visible text within a range or selection
+ * - innerText method for elements
+ *
+ * References
+ *
+ * https://www.w3.org/Bugs/Public/show_bug.cgi?id=13145
+ * http://aryeh.name/spec/innertext/innertext.html
+ * http://dvcs.w3.org/hg/editing/raw-file/tip/editing.html
+ *
+ * Part of Rangy, a cross-browser JavaScript range and selection library
+ * https://github.com/timdown/rangy
+ *
+ * Depends on Rangy core.
+ *
+ * Copyright 2014, Tim Down
+ * Licensed under the MIT license.
+ * Version: 1.3.0-alpha.20140921
+ * Build date: 21 September 2014
+ */
+
+/**
+ * Problem: handling of trailing spaces before line breaks is handled inconsistently between browsers.
+ *
+ * First, a <br>: this is relatively simple. For the following HTML:
+ *
+ * 1 <br>2
+ *
+ * - IE and WebKit render the space, include it in the selection (i.e. when the content is selected and pasted into a
+ *   textarea, the space is present) and allow the caret to be placed after it.
+ * - Firefox does not acknowledge the space in the selection but it is possible to place the caret after it.
+ * - Opera does not render the space but has two separate caret positions on either side of the space (left and right
+ *   arrow keys show this) and includes the space in the selection.
+ *
+ * The other case is the line break or breaks implied by block elements. For the following HTML:
+ *
+ * <p>1 </p><p>2<p>
+ *
+ * - WebKit does not acknowledge the space in any way
+ * - Firefox, IE and Opera as per <br>
+ *
+ * One more case is trailing spaces before line breaks in elements with white-space: pre-line. For the following HTML:
+ *
+ * <p style="white-space: pre-line">1
+ * 2</p>
+ *
+ * - Firefox and WebKit include the space in caret positions
+ * - IE does not support pre-line up to and including version 9
+ * - Opera ignores the space
+ * - Trailing space only renders if there is a non-collapsed character in the line
+ *
+ * Problem is whether Rangy should ever acknowledge the space and if so, when. Another problem is whether this can be
+ * feature-tested
+ */
+(function(factory, root) {
+    if (typeof define == "function" && define.amd) {
+        // AMD. Register as an anonymous module with a dependency on Rangy.
+        define(["./rangy-core"], factory);
+    } else if (typeof module != "undefined" && typeof exports == "object") {
+        // Node/CommonJS style
+        module.exports = factory( require("rangy") );
+    } else {
+        // No AMD or CommonJS support so we use the rangy property of root (probably the global variable)
+        factory(root.rangy);
+    }
+})(function(rangy) {
+    rangy.createModule("TextRange", ["WrappedSelection"], function(api, module) {
+        var UNDEF = "undefined";
+        var CHARACTER = "character", WORD = "word";
+        var dom = api.dom, util = api.util;
+        var extend = util.extend;
+        var createOptions = util.createOptions;
+        var getBody = dom.getBody;
+
+
+        var spacesRegex = /^[ \t\f\r\n]+$/;
+        var spacesMinusLineBreaksRegex = /^[ \t\f\r]+$/;
+        var allWhiteSpaceRegex = /^[\t-\r \u0085\u00A0\u1680\u180E\u2000-\u200B\u2028\u2029\u202F\u205F\u3000]+$/;
+        var nonLineBreakWhiteSpaceRegex = /^[\t \u00A0\u1680\u180E\u2000-\u200B\u202F\u205F\u3000]+$/;
+        var lineBreakRegex = /^[\n-\r\u0085\u2028\u2029]$/;
+
+        var defaultLanguage = "en";
+
+        var isDirectionBackward = api.Selection.isDirectionBackward;
+
+        // Properties representing whether trailing spaces inside blocks are completely collapsed (as they are in WebKit,
+        // but not other browsers). Also test whether trailing spaces before <br> elements are collapsed.
+        var trailingSpaceInBlockCollapses = false;
+        var trailingSpaceBeforeBrCollapses = false;
+        var trailingSpaceBeforeBlockCollapses = false;
+        var trailingSpaceBeforeLineBreakInPreLineCollapses = true;
+
+        (function() {
+            var el = document.createElement("div");
+            el.contentEditable = "true";
+            el.innerHTML = "<p>1 </p><p></p>";
+            var body = getBody(document);
+            var p = el.firstChild;
+            var sel = api.getSelection();
+
+            body.appendChild(el);
+            sel.collapse(p.lastChild, 2);
+            sel.setStart(p.firstChild, 0);
+            trailingSpaceInBlockCollapses = ("" + sel).length == 1;
+
+            el.innerHTML = "1 <br>";
+            sel.collapse(el, 2);
+            sel.setStart(el.firstChild, 0);
+            trailingSpaceBeforeBrCollapses = ("" + sel).length == 1;
+
+            el.innerHTML = "1 <p>1</p>";
+            sel.collapse(el, 2);
+            sel.setStart(el.firstChild, 0);
+            trailingSpaceBeforeBlockCollapses = ("" + sel).length == 1;
+
+            body.removeChild(el);
+            sel.removeAllRanges();
+        })();
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // This function must create word and non-word tokens for the whole of the text supplied to it
+        function defaultTokenizer(chars, wordOptions) {
+            var word = chars.join(""), result, tokens = [];
+
+            function createTokenFromRange(start, end, isWord) {
+                var tokenChars = chars.slice(start, end);
+                var token = {
+                    isWord: isWord,
+                    chars: tokenChars,
+                    toString: function() {
+                        return tokenChars.join("");
+                    }
+                };
+                for (var i = 0, len = tokenChars.length; i < len; ++i) {
+                    tokenChars[i].token = token;
+                }
+                tokens.push(token);
+            }
+
+            // Match words and mark characters
+            var lastWordEnd = 0, wordStart, wordEnd;
+            while ( (result = wordOptions.wordRegex.exec(word)) ) {
+                wordStart = result.index;
+                wordEnd = wordStart + result[0].length;
+
+                // Create token for non-word characters preceding this word
+                if (wordStart > lastWordEnd) {
+                    createTokenFromRange(lastWordEnd, wordStart, false);
+                }
+
+                // Get trailing space characters for word
+                if (wordOptions.includeTrailingSpace) {
+                    while (nonLineBreakWhiteSpaceRegex.test(chars[wordEnd])) {
+                        ++wordEnd;
+                    }
+                }
+                createTokenFromRange(wordStart, wordEnd, true);
+                lastWordEnd = wordEnd;
+            }
+
+            // Create token for trailing non-word characters, if any exist
+            if (lastWordEnd < chars.length) {
+                createTokenFromRange(lastWordEnd, chars.length, false);
+            }
+
+            return tokens;
+        }
+
+        var defaultCharacterOptions = {
+            includeBlockContentTrailingSpace: true,
+            includeSpaceBeforeBr: true,
+            includeSpaceBeforeBlock: true,
+            includePreLineTrailingSpace: true,
+            ignoreCharacters: ""
+        };
+        
+        function normalizeIgnoredCharacters(ignoredCharacters) {
+            // Check if character is ignored
+            var ignoredChars = ignoredCharacters || "";
+
+            // Normalize ignored characters into a string consisting of characters in ascending order of character code
+            var ignoredCharsArray = (typeof ignoredChars == "string") ? ignoredChars.split("") : ignoredChars;
+            ignoredCharsArray.sort(function(char1, char2) {
+                return char1.charCodeAt(0) - char2.charCodeAt(0);
+            });
+
+            /// Convert back to a string and remove duplicates 
+            return ignoredCharsArray.join("").replace(/(.)\1+/g, "$1");
+        }
+
+        var defaultCaretCharacterOptions = {
+            includeBlockContentTrailingSpace: !trailingSpaceBeforeLineBreakInPreLineCollapses,
+            includeSpaceBeforeBr: !trailingSpaceBeforeBrCollapses,
+            includeSpaceBeforeBlock: !trailingSpaceBeforeBlockCollapses,
+            includePreLineTrailingSpace: true
+        };
+        
+        var defaultWordOptions = {
+            "en": {
+                wordRegex: /[a-z0-9]+('[a-z0-9]+)*/gi,
+                includeTrailingSpace: false,
+                tokenizer: defaultTokenizer
+            }
+        };
+
+        var defaultFindOptions = {
+            caseSensitive: false,
+            withinRange: null,
+            wholeWordsOnly: false,
+            wrap: false,
+            direction: "forward",
+            wordOptions: null,
+            characterOptions: null
+        };
+
+        var defaultMoveOptions = {
+            wordOptions: null,
+            characterOptions: null
+        };
+
+        var defaultExpandOptions = {
+            wordOptions: null,
+            characterOptions: null,
+            trim: false,
+            trimStart: true,
+            trimEnd: true
+        };
+
+        var defaultWordIteratorOptions = {
+            wordOptions: null,
+            characterOptions: null,
+            direction: "forward"
+        };
+
+        function createWordOptions(options) {
+            var lang, defaults;
+            if (!options) {
+                return defaultWordOptions[defaultLanguage];
+            } else {
+                lang = options.language || defaultLanguage;
+                defaults = {};
+                extend(defaults, defaultWordOptions[lang] || defaultWordOptions[defaultLanguage]);
+                extend(defaults, options);
+                return defaults;
+            }
+        }
+
+        function createNestedOptions(optionsParam, defaults) {
+            var options = createOptions(optionsParam, defaults);
+            if (defaults.hasOwnProperty("wordOptions")) {
+                options.wordOptions = createWordOptions(options.wordOptions);
+            }
+            if (defaults.hasOwnProperty("characterOptions")) {
+                options.characterOptions = createOptions(options.characterOptions, defaultCharacterOptions);
+            }
+            return options;
+        }
+        
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        /* DOM utility functions */
+        var getComputedStyleProperty = dom.getComputedStyleProperty;
+
+        // Create cachable versions of DOM functions
+
+        // Test for old IE's incorrect display properties
+        var tableCssDisplayBlock;
+        (function() {
+            var table = document.createElement("table");
+            var body = getBody(document);
+            body.appendChild(table);
+            tableCssDisplayBlock = (getComputedStyleProperty(table, "display") == "block");
+            body.removeChild(table);
+        })();
+
+        api.features.tableCssDisplayBlock = tableCssDisplayBlock;
+
+        var defaultDisplayValueForTag = {
+            table: "table",
+            caption: "table-caption",
+            colgroup: "table-column-group",
+            col: "table-column",
+            thead: "table-header-group",
+            tbody: "table-row-group",
+            tfoot: "table-footer-group",
+            tr: "table-row",
+            td: "table-cell",
+            th: "table-cell"
+        };
+
+        // Corrects IE's "block" value for table-related elements
+        function getComputedDisplay(el, win) {
+            var display = getComputedStyleProperty(el, "display", win);
+            var tagName = el.tagName.toLowerCase();
+            return (display == "block" &&
+                    tableCssDisplayBlock &&
+                    defaultDisplayValueForTag.hasOwnProperty(tagName)) ?
+                defaultDisplayValueForTag[tagName] : display;
+        }
+
+        function isHidden(node) {
+            var ancestors = getAncestorsAndSelf(node);
+            for (var i = 0, len = ancestors.length; i < len; ++i) {
+                if (ancestors[i].nodeType == 1 && getComputedDisplay(ancestors[i]) == "none") {
+                    return true;
+                }
+            }
+
+            return false;
+        }
+
+        function isVisibilityHiddenTextNode(textNode) {
+            var el;
+            return textNode.nodeType == 3 &&
+                (el = textNode.parentNode) &&
+                getComputedStyleProperty(el, "visibility") == "hidden";
+        }
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+    
+        // "A block node is either an Element whose "display" property does not have
+        // resolved value "inline" or "inline-block" or "inline-table" or "none", or a
+        // Document, or a DocumentFragment."
+        function isBlockNode(node) {
+            return node &&
+                ((node.nodeType == 1 && !/^(inline(-block|-table)?|none)$/.test(getComputedDisplay(node))) ||
+                node.nodeType == 9 || node.nodeType == 11);
+        }
+
+        function getLastDescendantOrSelf(node) {
+            var lastChild = node.lastChild;
+            return lastChild ? getLastDescendantOrSelf(lastChild) : node;
+        }
+
+        function containsPositions(node) {
+            return dom.isCharacterDataNode(node) ||
+                !/^(area|base|basefont|br|col|frame|hr|img|input|isindex|link|meta|param)$/i.test(node.nodeName);
+        }
+
+        function getAncestors(node) {
+            var ancestors = [];
+            while (node.parentNode) {
+                ancestors.unshift(node.parentNode);
+                node = node.parentNode;
+            }
+            return ancestors;
+        }
+
+        function getAncestorsAndSelf(node) {
+            return getAncestors(node).concat([node]);
+        }
+
+        function nextNodeDescendants(node) {
+            while (node && !node.nextSibling) {
+                node = node.parentNode;
+            }
+            if (!node) {
+                return null;
+            }
+            return node.nextSibling;
+        }
+
+        function nextNode(node, excludeChildren) {
+            if (!excludeChildren && node.hasChildNodes()) {
+                return node.firstChild;
+            }
+            return nextNodeDescendants(node);
+        }
+
+        function previousNode(node) {
+            var previous = node.previousSibling;
+            if (previous) {
+                node = previous;
+                while (node.hasChildNodes()) {
+                    node = node.lastChild;
+                }
+                return node;
+            }
+            var parent = node.parentNode;
+            if (parent && parent.nodeType == 1) {
+                return parent;
+            }
+            return null;
+        }
+
+        // Adpated from Aryeh's code.
+        // "A whitespace node is either a Text node whose data is the empty string; or
+        // a Text node whose data consists only of one or more tabs (0x0009), line
+        // feeds (0x000A), carriage returns (0x000D), and/or spaces (0x0020), and whose
+        // parent is an Element whose resolved value for "white-space" is "normal" or
+        // "nowrap"; or a Text node whose data consists only of one or more tabs
+        // (0x0009), carriage returns (0x000D), and/or spaces (0x0020), and whose
+        // parent is an Element whose resolved value for "white-space" is "pre-line"."
+        function isWhitespaceNode(node) {
+            if (!node || node.nodeType != 3) {
+                return false;
+            }
+            var text = node.data;
+            if (text === "") {
+                return true;
+            }
+            var parent = node.parentNode;
+            if (!parent || parent.nodeType != 1) {
+                return false;
+            }
+            var computedWhiteSpace = getComputedStyleProperty(node.parentNode, "whiteSpace");
+
+            return (/^[\t\n\r ]+$/.test(text) && /^(normal|nowrap)$/.test(computedWhiteSpace)) ||
+                (/^[\t\r ]+$/.test(text) && computedWhiteSpace == "pre-line");
+        }
+
+        // Adpated from Aryeh's code.
+        // "node is a collapsed whitespace node if the following algorithm returns
+        // true:"
+        function isCollapsedWhitespaceNode(node) {
+            // "If node's data is the empty string, return true."
+            if (node.data === "") {
+                return true;
+            }
+
+            // "If node is not a whitespace node, return false."
+            if (!isWhitespaceNode(node)) {
+                return false;
+            }
+
+            // "Let ancestor be node's parent."
+            var ancestor = node.parentNode;
+
+            // "If ancestor is null, return true."
+            if (!ancestor) {
+                return true;
+            }
+
+            // "If the "display" property of some ancestor of node has resolved value "none", return true."
+            if (isHidden(node)) {
+                return true;
+            }
+
+            return false;
+        }
+
+        function isCollapsedNode(node) {
+            var type = node.nodeType;
+            return type == 7 /* PROCESSING_INSTRUCTION */ ||
+                type == 8 /* COMMENT */ ||
+                isHidden(node) ||
+                /^(script|style)$/i.test(node.nodeName) ||
+                isVisibilityHiddenTextNode(node) ||
+                isCollapsedWhitespaceNode(node);
+        }
+
+        function isIgnoredNode(node, win) {
+            var type = node.nodeType;
+            return type == 7 /* PROCESSING_INSTRUCTION */ ||
+                type == 8 /* COMMENT */ ||
+                (type == 1 && getComputedDisplay(node, win) == "none");
+        }
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // Possibly overengineered caching system to prevent repeated DOM calls slowing everything down
+
+        function Cache() {
+            this.store = {};
+        }
+
+        Cache.prototype = {
+            get: function(key) {
+                return this.store.hasOwnProperty(key) ? this.store[key] : null;
+            },
+
+            set: function(key, value) {
+                return this.store[key] = value;
+            }
+        };
+
+        var cachedCount = 0, uncachedCount = 0;
+        
+        function createCachingGetter(methodName, func, objProperty) {
+            return function(args) {
+                var cache = this.cache;
+                if (cache.hasOwnProperty(methodName)) {
+                    cachedCount++;
+                    return cache[methodName];
+                } else {
+                    uncachedCount++;
+                    var value = func.call(this, objProperty ? this[objProperty] : this, args);
+                    cache[methodName] = value;
+                    return value;
+                }
+            };
+        }
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        function NodeWrapper(node, session) {
+            this.node = node;
+            this.session = session;
+            this.cache = new Cache();
+            this.positions = new Cache();
+        }
+
+        var nodeProto = {
+            getPosition: function(offset) {
+                var positions = this.positions;
+                return positions.get(offset) || positions.set(offset, new Position(this, offset));
+            },
+
+            toString: function() {
+                return "[NodeWrapper(" + dom.inspectNode(this.node) + ")]";
+            }
+        };
+
+        NodeWrapper.prototype = nodeProto;
+
+        var EMPTY = "EMPTY",
+            NON_SPACE = "NON_SPACE",
+            UNCOLLAPSIBLE_SPACE = "UNCOLLAPSIBLE_SPACE",
+            COLLAPSIBLE_SPACE = "COLLAPSIBLE_SPACE",
+            TRAILING_SPACE_BEFORE_BLOCK = "TRAILING_SPACE_BEFORE_BLOCK",
+            TRAILING_SPACE_IN_BLOCK = "TRAILING_SPACE_IN_BLOCK",
+            TRAILING_SPACE_BEFORE_BR = "TRAILING_SPACE_BEFORE_BR",
+            PRE_LINE_TRAILING_SPACE_BEFORE_LINE_BREAK = "PRE_LINE_TRAILING_SPACE_BEFORE_LINE_BREAK",
+            TRAILING_LINE_BREAK_AFTER_BR = "TRAILING_LINE_BREAK_AFTER_BR";
+
+        extend(nodeProto, {
+            isCharacterDataNode: createCachingGetter("isCharacterDataNode", dom.isCharacterDataNode, "node"),
+            getNodeIndex: createCachingGetter("nodeIndex", dom.getNodeIndex, "node"),
+            getLength: createCachingGetter("nodeLength", dom.getNodeLength, "node"),
+            containsPositions: createCachingGetter("containsPositions", containsPositions, "node"),
+            isWhitespace: createCachingGetter("isWhitespace", isWhitespaceNode, "node"),
+            isCollapsedWhitespace: createCachingGetter("isCollapsedWhitespace", isCollapsedWhitespaceNode, "node"),
+            getComputedDisplay: createCachingGetter("computedDisplay", getComputedDisplay, "node"),
+            isCollapsed: createCachingGetter("collapsed", isCollapsedNode, "node"),
+            isIgnored: createCachingGetter("ignored", isIgnoredNode, "node"),
+            next: createCachingGetter("nextPos", nextNode, "node"),
+            previous: createCachingGetter("previous", previousNode, "node"),
+
+            getTextNodeInfo: createCachingGetter("textNodeInfo", function(textNode) {
+                var spaceRegex = null, collapseSpaces = false;
+                var cssWhitespace = getComputedStyleProperty(textNode.parentNode, "whiteSpace");
+                var preLine = (cssWhitespace == "pre-line");
+                if (preLine) {
+                    spaceRegex = spacesMinusLineBreaksRegex;
+                    collapseSpaces = true;
+                } else if (cssWhitespace == "normal" || cssWhitespace == "nowrap") {
+                    spaceRegex = spacesRegex;
+                    collapseSpaces = true;
+                }
+
+                return {
+                    node: textNode,
+                    text: textNode.data,
+                    spaceRegex: spaceRegex,
+                    collapseSpaces: collapseSpaces,
+                    preLine: preLine
+                };
+            }, "node"),
+
+            hasInnerText: createCachingGetter("hasInnerText", function(el, backward) {
+                var session = this.session;
+                var posAfterEl = session.getPosition(el.parentNode, this.getNodeIndex() + 1);
+                var firstPosInEl = session.getPosition(el, 0);
+
+                var pos = backward ? posAfterEl : firstPosInEl;
+                var endPos = backward ? firstPosInEl : posAfterEl;
+
+                /*
+                 <body><p>X  </p><p>Y</p></body>
+
+                 Positions:
+
+                 body:0:""
+                 p:0:""
+                 text:0:""
+                 text:1:"X"
+                 text:2:TRAILING_SPACE_IN_BLOCK
+                 text:3:COLLAPSED_SPACE
+                 p:1:""
+                 body:1:"\n"
+                 p:0:""
+                 text:0:""
+                 text:1:"Y"
+
+                 A character is a TRAILING_SPACE_IN_BLOCK iff:
+
+                 - There is no uncollapsed character after it within the visible containing block element
+
+                 A character is a TRAILING_SPACE_BEFORE_BR iff:
+
+                 - There is no uncollapsed character after it preceding a <br> element
+
+                 An element has inner text iff
+
+                 - It is not hidden
+                 - It contains an uncollapsed character
+
+                 All trailing spaces (pre-line, before <br>, end of block) require definite non-empty characters to render.
+                 */
+
+                while (pos !== endPos) {
+                    pos.prepopulateChar();
+                    if (pos.isDefinitelyNonEmpty()) {
+                        return true;
+                    }
+                    pos = backward ? pos.previousVisible() : pos.nextVisible();
+                }
+
+                return false;
+            }, "node"),
+            
+            isRenderedBlock: createCachingGetter("isRenderedBlock", function(el) {
+                // Ensure that a block element containing a <br> is considered to have inner text 
+                var brs = el.getElementsByTagName("br");
+                for (var i = 0, len = brs.length; i < len; ++i) {
+                    if (!isCollapsedNode(brs[i])) {
+                        return true;
+                    }
+                }
+                return this.hasInnerText();
+            }, "node"),
+
+            getTrailingSpace: createCachingGetter("trailingSpace", function(el) {
+                if (el.tagName.toLowerCase() == "br") {
+                    return "";
+                } else {
+                    switch (this.getComputedDisplay()) {
+                        case "inline":
+                            var child = el.lastChild;
+                            while (child) {
+                                if (!isIgnoredNode(child)) {
+                                    return (child.nodeType == 1) ? this.session.getNodeWrapper(child).getTrailingSpace() : "";
+                                }
+                                child = child.previousSibling;
+                            }
+                            break;
+                        case "inline-block":
+                        case "inline-table":
+                        case "none":
+                        case "table-column":
+                        case "table-column-group":
+                            break;
+                        case "table-cell":
+                            return "\t";
+                        default:
+                            return this.isRenderedBlock(true) ? "\n" : "";
+                    }
+                }
+                return "";
+            }, "node"),
+
+            getLeadingSpace: createCachingGetter("leadingSpace", function(el) {
+                switch (this.getComputedDisplay()) {
+                    case "inline":
+                    case "inline-block":
+                    case "inline-table":
+                    case "none":
+                    case "table-column":
+                    case "table-column-group":
+                    case "table-cell":
+                        break;
+                    default:
+                        return this.isRenderedBlock(false) ? "\n" : "";
+                }
+                return "";
+            }, "node")
+        });
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+    
+        function Position(nodeWrapper, offset) {
+            this.offset = offset;
+            this.nodeWrapper = nodeWrapper;
+            this.node = nodeWrapper.node;
+            this.session = nodeWrapper.session;
+            this.cache = new Cache();
+        }
+
+        function inspectPosition() {
+            return "[Position(" + dom.inspectNode(this.node) + ":" + this.offset + ")]";
+        }
+
+        var positionProto = {
+            character: "",
+            characterType: EMPTY,
+            isBr: false,
+
+            /*
+            This method:
+            - Fully populates positions that have characters that can be determined independently of any other characters.
+            - Populates most types of space positions with a provisional character. The character is finalized later.
+             */
+            prepopulateChar: function() {
+                var pos = this;
+                if (!pos.prepopulatedChar) {
+                    var node = pos.node, offset = pos.offset;
+                    var visibleChar = "", charType = EMPTY;
+                    var finalizedChar = false;
+                    if (offset > 0) {
+                        if (node.nodeType == 3) {
+                            var text = node.data;
+                            var textChar = text.charAt(offset - 1);
+
+                            var nodeInfo = pos.nodeWrapper.getTextNodeInfo();
+                            var spaceRegex = nodeInfo.spaceRegex;
+                            if (nodeInfo.collapseSpaces) {
+                                if (spaceRegex.test(textChar)) {
+                                    // "If the character at position is from set, append a single space (U+0020) to newdata and advance
+                                    // position until the character at position is not from set."
+
+                                    // We also need to check for the case where we're in a pre-line and we have a space preceding a
+                                    // line break, because such spaces are collapsed in some browsers
+                                    if (offset > 1 && spaceRegex.test(text.charAt(offset - 2))) {
+                                    } else if (nodeInfo.preLine && text.charAt(offset) === "\n") {
+                                        visibleChar = " ";
+                                        charType = PRE_LINE_TRAILING_SPACE_BEFORE_LINE_BREAK;
+                                    } else {
+                                        visibleChar = " ";
+                                        //pos.checkForFollowingLineBreak = true;
+                                        charType = COLLAPSIBLE_SPACE;
+                                    }
+                                } else {
+                                    visibleChar = textChar;
+                                    charType = NON_SPACE;
+                                    finalizedChar = true;
+                                }
+                            } else {
+                                visibleChar = textChar;
+                                charType = UNCOLLAPSIBLE_SPACE;
+                                finalizedChar = true;
+                            }
+                        } else {
+                            var nodePassed = node.childNodes[offset - 1];
+                            if (nodePassed && nodePassed.nodeType == 1 && !isCollapsedNode(nodePassed)) {
+                                if (nodePassed.tagName.toLowerCase() == "br") {
+                                    visibleChar = "\n";
+                                    pos.isBr = true;
+                                    charType = COLLAPSIBLE_SPACE;
+                                    finalizedChar = false;
+                                } else {
+                                    pos.checkForTrailingSpace = true;
+                                }
+                            }
+
+                            // Check the leading space of the next node for the case when a block element follows an inline
+                            // element or text node. In that case, there is an implied line break between the two nodes.
+                            if (!visibleChar) {
+                                var nextNode = node.childNodes[offset];
+                                if (nextNode && nextNode.nodeType == 1 && !isCollapsedNode(nextNode)) {
+                                    pos.checkForLeadingSpace = true;
+                                }
+                            }
+                        }
+                    }
+
+                    pos.prepopulatedChar = true;
+                    pos.character = visibleChar;
+                    pos.characterType = charType;
+                    pos.isCharInvariant = finalizedChar;
+                }
+            },
+
+            isDefinitelyNonEmpty: function() {
+                var charType = this.characterType;
+                return charType == NON_SPACE || charType == UNCOLLAPSIBLE_SPACE;
+            },
+
+            // Resolve leading and trailing spaces, which may involve prepopulating other positions
+            resolveLeadingAndTrailingSpaces: function() {
+                if (!this.prepopulatedChar) {
+                    this.prepopulateChar();
+                }
+                if (this.checkForTrailingSpace) {
+                    var trailingSpace = this.session.getNodeWrapper(this.node.childNodes[this.offset - 1]).getTrailingSpace();
+                    if (trailingSpace) {
+                        this.isTrailingSpace = true;
+                        this.character = trailingSpace;
+                        this.characterType = COLLAPSIBLE_SPACE;
+                    }
+                    this.checkForTrailingSpace = false;
+                }
+                if (this.checkForLeadingSpace) {
+                    var leadingSpace = this.session.getNodeWrapper(this.node.childNodes[this.offset]).getLeadingSpace();
+                    if (leadingSpace) {
+                        this.isLeadingSpace = true;
+                        this.character = leadingSpace;
+                        this.characterType = COLLAPSIBLE_SPACE;
+                    }
+                    this.checkForLeadingSpace = false;
+                }
+            },
+            
+            getPrecedingUncollapsedPosition: function(characterOptions) {
+                var pos = this, character;
+                while ( (pos = pos.previousVisible()) ) {
+                    character = pos.getCharacter(characterOptions);
+                    if (character !== "") {
+                        return pos;
+                    }
+                }
+
+                return null;
+            },
+
+            getCharacter: function(characterOptions) {
+                this.resolveLeadingAndTrailingSpaces();
+                
+                var thisChar = this.character, returnChar;
+
+                // Check if character is ignored
+                var ignoredChars = normalizeIgnoredCharacters(characterOptions.ignoreCharacters);
+                var isIgnoredCharacter = (thisChar !== "" && ignoredChars.indexOf(thisChar) > -1);
+                
+                // Check if this position's  character is invariant (i.e. not dependent on character options) and return it
+                // if so
+                if (this.isCharInvariant) {
+                    returnChar = isIgnoredCharacter ? "" : thisChar;
+                    return returnChar;
+                }
+                
+                var cacheKey = ["character", characterOptions.includeSpaceBeforeBr, characterOptions.includeBlockContentTrailingSpace, characterOptions.includePreLineTrailingSpace, ignoredChars].join("_");
+                var cachedChar = this.cache.get(cacheKey);
+                if (cachedChar !== null) {
+                    return cachedChar;
+                }
+                
+                // We need to actually get the character
+                var character = "";
+                var collapsible = (this.characterType == COLLAPSIBLE_SPACE);
+                
+                var nextPos, previousPos;
+                var gotPreviousPos = false;
+                var pos = this;
+                
+                function getPreviousPos() {
+                    if (!gotPreviousPos) {
+                        previousPos = pos.getPrecedingUncollapsedPosition(characterOptions);
+                        gotPreviousPos = true;
+                    }
+                    return previousPos;
+                }
+
+                // Disallow a collapsible space that is followed by a line break or is the last character
+                if (collapsible) {
+                    // Disallow a collapsible space that follows a trailing space or line break, or is the first character
+                    if (thisChar == " " &&
+                            (!getPreviousPos() || previousPos.isTrailingSpace || previousPos.character == "\n")) {
+                    }
+                    // Allow a leading line break unless it follows a line break
+                    else if (thisChar == "\n" && this.isLeadingSpace) {
+                        if (getPreviousPos() && previousPos.character != "\n") {
+                            character = "\n";
+                        } else {
+                        }
+                    } else {
+                        nextPos = this.nextUncollapsed();
+                        if (nextPos) {
+                            if (nextPos.isBr) {
+                                this.type = TRAILING_SPACE_BEFORE_BR;
+                            } else if (nextPos.isTrailingSpace && nextPos.character == "\n") {
+                                this.type = TRAILING_SPACE_IN_BLOCK;
+                            } else if (nextPos.isLeadingSpace && nextPos.character == "\n") {
+                                this.type = TRAILING_SPACE_BEFORE_BLOCK;
+                            }
+                            
+                            if (nextPos.character == "\n") {
+                                if (this.type == TRAILING_SPACE_BEFORE_BR && !characterOptions.includeSpaceBeforeBr) {
+                                } else if (this.type == TRAILING_SPACE_BEFORE_BLOCK && !characterOptions.includeSpaceBeforeBlock) {
+                                } else if (this.type == TRAILING_SPACE_IN_BLOCK && nextPos.isTrailingSpace && !characterOptions.includeBlockContentTrailingSpace) {
+                                } else if (this.type == PRE_LINE_TRAILING_SPACE_BEFORE_LINE_BREAK && nextPos.type == NON_SPACE && !characterOptions.includePreLineTrailingSpace) {
+                                } else if (thisChar == "\n") {
+                                    if (nextPos.isTrailingSpace) {
+                                        if (this.isTrailingSpace) {
+                                        } else if (this.isBr) {
+                                            nextPos.type = TRAILING_LINE_BREAK_AFTER_BR;
+                                            
+                                            if (getPreviousPos() && previousPos.isLeadingSpace && previousPos.character == "\n") {
+                                                nextPos.character = "";
+                                            } else {
+                                            }
+                                        }
+                                    } else {
+                                        character = "\n";
+                                    }
+                                } else if (thisChar == " ") {
+                                    character = " ";
+                                } else {
+                                }
+                            } else {
+                                character = thisChar;
+                            }
+                        } else {
+                        }
+                    }
+                }
+
+                // Collapse a br element that is followed by a trailing space
+                else if (thisChar == "\n" &&
+                        (!(nextPos = this.nextUncollapsed()) || nextPos.isTrailingSpace)) {
+                }
+                
+                if (ignoredChars.indexOf(character) > -1) {
+                    character = "";
+                }
+                
+                
+                this.cache.set(cacheKey, character);
+
+                return character;
+            },
+
+            equals: function(pos) {
+                return !!pos && this.node === pos.node && this.offset === pos.offset;
+            },
+
+            inspect: inspectPosition,
+
+            toString: function() {
+                return this.character;
+            }
+        };
+
+        Position.prototype = positionProto;
+
+        extend(positionProto, {
+            next: createCachingGetter("nextPos", function(pos) {
+                var nodeWrapper = pos.nodeWrapper, node = pos.node, offset = pos.offset, session = nodeWrapper.session;
+                if (!node) {
+                    return null;
+                }
+                var nextNode, nextOffset, child;
+                if (offset == nodeWrapper.getLength()) {
+                    // Move onto the next node
+                    nextNode = node.parentNode;
+                    nextOffset = nextNode ? nodeWrapper.getNodeIndex() + 1 : 0;
+                } else {
+                    if (nodeWrapper.isCharacterDataNode()) {
+                        nextNode = node;
+                        nextOffset = offset + 1;
+                    } else {
+                        child = node.childNodes[offset];
+                        // Go into the children next, if children there are
+                        if (session.getNodeWrapper(child).containsPositions()) {
+                            nextNode = child;
+                            nextOffset = 0;
+                        } else {
+                            nextNode = node;
+                            nextOffset = offset + 1;
+                        }
+                    }
+                }
+
+                return nextNode ? session.getPosition(nextNode, nextOffset) : null;
+            }),
+
+            previous: createCachingGetter("previous", function(pos) {
+                var nodeWrapper = pos.nodeWrapper, node = pos.node, offset = pos.offset, session = nodeWrapper.session;
+                var previousNode, previousOffset, child;
+                if (offset == 0) {
+                    previousNode = node.parentNode;
+                    previousOffset = previousNode ? nodeWrapper.getNodeIndex() : 0;
+                } else {
+                    if (nodeWrapper.isCharacterDataNode()) {
+                        previousNode = node;
+                        previousOffset = offset - 1;
+                    } else {
+                        child = node.childNodes[offset - 1];
+                        // Go into the children next, if children there are
+                        if (session.getNodeWrapper(child).containsPositions()) {
+                            previousNode = child;
+                            previousOffset = dom.getNodeLength(child);
+                        } else {
+                            previousNode = node;
+                            previousOffset = offset - 1;
+                        }
+                    }
+                }
+                return previousNode ? session.getPosition(previousNode, previousOffset) : null;
+            }),
+
+            /*
+             Next and previous position moving functions that filter out
+
+             - Hidden (CSS visibility/display) elements
+             - Script and style elements
+             */
+            nextVisible: createCachingGetter("nextVisible", function(pos) {
+                var next = pos.next();
+                if (!next) {
+                    return null;
+                }
+                var nodeWrapper = next.nodeWrapper, node = next.node;
+                var newPos = next;
+                if (nodeWrapper.isCollapsed()) {
+                    // We're skipping this node and all its descendants
+                    newPos = nodeWrapper.session.getPosition(node.parentNode, nodeWrapper.getNodeIndex() + 1);
+                }
+                return newPos;
+            }),
+
+            nextUncollapsed: createCachingGetter("nextUncollapsed", function(pos) {
+                var nextPos = pos;
+                while ( (nextPos = nextPos.nextVisible()) ) {
+                    nextPos.resolveLeadingAndTrailingSpaces();
+                    if (nextPos.character !== "") {
+                        return nextPos;
+                    }
+                }
+                return null;
+            }),
+
+            previousVisible: createCachingGetter("previousVisible", function(pos) {
+                var previous = pos.previous();
+                if (!previous) {
+                    return null;
+                }
+                var nodeWrapper = previous.nodeWrapper, node = previous.node;
+                var newPos = previous;
+                if (nodeWrapper.isCollapsed()) {
+                    // We're skipping this node and all its descendants
+                    newPos = nodeWrapper.session.getPosition(node.parentNode, nodeWrapper.getNodeIndex());
+                }
+                return newPos;
+            })
+        });
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        var currentSession = null;
+
+        var Session = (function() {
+            function createWrapperCache(nodeProperty) {
+                var cache = new Cache();
+
+                return {
+                    get: function(node) {
+                        var wrappersByProperty = cache.get(node[nodeProperty]);
+                        if (wrappersByProperty) {
+                            for (var i = 0, wrapper; wrapper = wrappersByProperty[i++]; ) {
+                                if (wrapper.node === node) {
+                                    return wrapper;
+                                }
+                            }
+                        }
+                        return null;
+                    },
+
+                    set: function(nodeWrapper) {
+                        var property = nodeWrapper.node[nodeProperty];
+                        var wrappersByProperty = cache.get(property) || cache.set(property, []);
+                        wrappersByProperty.push(nodeWrapper);
+                    }
+                };
+            }
+
+            var uniqueIDSupported = util.isHostProperty(document.documentElement, "uniqueID");
+
+            function Session() {
+                this.initCaches();
+            }
+
+            Session.prototype = {
+                initCaches: function() {
+                    this.elementCache = uniqueIDSupported ? (function() {
+                        var elementsCache = new Cache();
+
+                        return {
+                            get: function(el) {
+                                return elementsCache.get(el.uniqueID);
+                            },
+
+                            set: function(elWrapper) {
+                                elementsCache.set(elWrapper.node.uniqueID, elWrapper);
+                            }
+                        };
+                    })() : createWrapperCache("tagName");
+
+                    // Store text nodes keyed by data, although we may need to truncate this
+                    this.textNodeCache = createWrapperCache("data");
+                    this.otherNodeCache = createWrapperCache("nodeName");
+                },
+
+                getNodeWrapper: function(node) {
+                    var wrapperCache;
+                    switch (node.nodeType) {
+                        case 1:
+                            wrapperCache = this.elementCache;
+                            break;
+                        case 3:
+                            wrapperCache = this.textNodeCache;
+                            break;
+                        default:
+                            wrapperCache = this.otherNodeCache;
+                            break;
+                    }
+
+                    var wrapper = wrapperCache.get(node);
+                    if (!wrapper) {
+                        wrapper = new NodeWrapper(node, this);
+                        wrapperCache.set(wrapper);
+                    }
+                    return wrapper;
+                },
+
+                getPosition: function(node, offset) {
+                    return this.getNodeWrapper(node).getPosition(offset);
+                },
+
+                getRangeBoundaryPosition: function(range, isStart) {
+                    var prefix = isStart ? "start" : "end";
+                    return this.getPosition(range[prefix + "Container"], range[prefix + "Offset"]);
+                },
+
+                detach: function() {
+                    this.elementCache = this.textNodeCache = this.otherNodeCache = null;
+                }
+            };
+
+            return Session;
+        })();
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        function startSession() {
+            endSession();
+            return (currentSession = new Session());
+        }
+
+        function getSession() {
+            return currentSession || startSession();
+        }
+
+        function endSession() {
+            if (currentSession) {
+                currentSession.detach();
+            }
+            currentSession = null;
+        }
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // Extensions to the rangy.dom utility object
+
+        extend(dom, {
+            nextNode: nextNode,
+            previousNode: previousNode
+        });
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        function createCharacterIterator(startPos, backward, endPos, characterOptions) {
+
+            // Adjust the end position to ensure that it is actually reached
+            if (endPos) {
+                if (backward) {
+                    if (isCollapsedNode(endPos.node)) {
+                        endPos = startPos.previousVisible();
+                    }
+                } else {
+                    if (isCollapsedNode(endPos.node)) {
+                        endPos = endPos.nextVisible();
+                    }
+                }
+            }
+
+            var pos = startPos, finished = false;
+
+            function next() {
+                var charPos = null;
+                if (backward) {
+                    charPos = pos;
+                    if (!finished) {
+                        pos = pos.previousVisible();
+                        finished = !pos || (endPos && pos.equals(endPos));
+                    }
+                } else {
+                    if (!finished) {
+                        charPos = pos = pos.nextVisible();
+                        finished = !pos || (endPos && pos.equals(endPos));
+                    }
+                }
+                if (finished) {
+                    pos = null;
+                }
+                return charPos;
+            }
+
+            var previousTextPos, returnPreviousTextPos = false;
+
+            return {
+                next: function() {
+                    if (returnPreviousTextPos) {
+                        returnPreviousTextPos = false;
+                        return previousTextPos;
+                    } else {
+                        var pos, character;
+                        while ( (pos = next()) ) {
+                            character = pos.getCharacter(characterOptions);
+                            if (character) {
+                                previousTextPos = pos;
+                                return pos;
+                            }
+                        }
+                        return null;
+                    }
+                },
+
+                rewind: function() {
+                    if (previousTextPos) {
+                        returnPreviousTextPos = true;
+                    } else {
+                        throw module.createError("createCharacterIterator: cannot rewind. Only one position can be rewound.");
+                    }
+                },
+
+                dispose: function() {
+                    startPos = endPos = null;
+                }
+            };
+        }
+
+        var arrayIndexOf = Array.prototype.indexOf ?
+            function(arr, val) {
+                return arr.indexOf(val);
+            } :
+            function(arr, val) {
+                for (var i = 0, len = arr.length; i < len; ++i) {
+                    if (arr[i] === val) {
+                        return i;
+                    }
+                }
+                return -1;
+            };
+
+        // Provides a pair of iterators over text positions, tokenized. Transparently requests more text when next()
+        // is called and there is no more tokenized text
+        function createTokenizedTextProvider(pos, characterOptions, wordOptions) {
+            var forwardIterator = createCharacterIterator(pos, false, null, characterOptions);
+            var backwardIterator = createCharacterIterator(pos, true, null, characterOptions);
+            var tokenizer = wordOptions.tokenizer;
+
+            // Consumes a word and the whitespace beyond it
+            function consumeWord(forward) {
+                var pos, textChar;
+                var newChars = [], it = forward ? forwardIterator : backwardIterator;
+
+                var passedWordBoundary = false, insideWord = false;
+
+                while ( (pos = it.next()) ) {
+                    textChar = pos.character;
+                    
+
+                    if (allWhiteSpaceRegex.test(textChar)) {
+                        if (insideWord) {
+                            insideWord = false;
+                            passedWordBoundary = true;
+                        }
+                    } else {
+                        if (passedWordBoundary) {
+                            it.rewind();
+                            break;
+                        } else {
+                            insideWord = true;
+                        }
+                    }
+                    newChars.push(pos);
+                }
+
+
+                return newChars;
+            }
+
+            // Get initial word surrounding initial position and tokenize it
+            var forwardChars = consumeWord(true);
+            var backwardChars = consumeWord(false).reverse();
+            var tokens = tokenizer(backwardChars.concat(forwardChars), wordOptions);
+
+            // Create initial token buffers
+            var forwardTokensBuffer = forwardChars.length ?
+                tokens.slice(arrayIndexOf(tokens, forwardChars[0].token)) : [];
+
+            var backwardTokensBuffer = backwardChars.length ?
+                tokens.slice(0, arrayIndexOf(tokens, backwardChars.pop().token) + 1) : [];
+
+            function inspectBuffer(buffer) {
+                var textPositions = ["[" + buffer.length + "]"];
+                for (var i = 0; i < buffer.length; ++i) {
+                    textPositions.push("(word: " + buffer[i] + ", is word: " + buffer[i].isWord + ")");
+                }
+                return textPositions;
+            }
+
+
+            return {
+                nextEndToken: function() {
+                    var lastToken, forwardChars;
+
+                    // If we're down to the last token, consume character chunks until we have a word or run out of
+                    // characters to consume
+                    while ( forwardTokensBuffer.length == 1 &&
+                        !(lastToken = forwardTokensBuffer[0]).isWord &&
+                        (forwardChars = consumeWord(true)).length > 0) {
+
+                        // Merge trailing non-word into next word and tokenize
+                        forwardTokensBuffer = tokenizer(lastToken.chars.concat(forwardChars), wordOptions);
+                    }
+
+                    return forwardTokensBuffer.shift();
+                },
+
+                previousStartToken: function() {
+                    var lastToken, backwardChars;
+
+                    // If we're down to the last token, consume character chunks until we have a word or run out of
+                    // characters to consume
+                    while ( backwardTokensBuffer.length == 1 &&
+                        !(lastToken = backwardTokensBuffer[0]).isWord &&
+                        (backwardChars = consumeWord(false)).length > 0) {
+
+                        // Merge leading non-word into next word and tokenize
+                        backwardTokensBuffer = tokenizer(backwardChars.reverse().concat(lastToken.chars), wordOptions);
+                    }
+
+                    return backwardTokensBuffer.pop();
+                },
+
+                dispose: function() {
+                    forwardIterator.dispose();
+                    backwardIterator.dispose();
+                    forwardTokensBuffer = backwardTokensBuffer = null;
+                }
+            };
+        }
+
+        function movePositionBy(pos, unit, count, characterOptions, wordOptions) {
+            var unitsMoved = 0, currentPos, newPos = pos, charIterator, nextPos, absCount = Math.abs(count), token;
+            if (count !== 0) {
+                var backward = (count < 0);
+
+                switch (unit) {
+                    case CHARACTER:
+                        charIterator = createCharacterIterator(pos, backward, null, characterOptions);
+                        while ( (currentPos = charIterator.next()) && unitsMoved < absCount ) {
+                            ++unitsMoved;
+                            newPos = currentPos;
+                        }
+                        nextPos = currentPos;
+                        charIterator.dispose();
+                        break;
+                    case WORD:
+                        var tokenizedTextProvider = createTokenizedTextProvider(pos, characterOptions, wordOptions);
+                        var next = backward ? tokenizedTextProvider.previousStartToken : tokenizedTextProvider.nextEndToken;
+
+                        while ( (token = next()) && unitsMoved < absCount ) {
+                            if (token.isWord) {
+                                ++unitsMoved;
+                                newPos = backward ? token.chars[0] : token.chars[token.chars.length - 1];
+                            }
+                        }
+                        break;
+                    default:
+                        throw new Error("movePositionBy: unit '" + unit + "' not implemented");
+                }
+
+                // Perform any necessary position tweaks
+                if (backward) {
+                    newPos = newPos.previousVisible();
+                    unitsMoved = -unitsMoved;
+                } else if (newPos && newPos.isLeadingSpace) {
+                    // Tweak the position for the case of a leading space. The problem is that an uncollapsed leading space
+                    // before a block element (for example, the line break between "1" and "2" in the following HTML:
+                    // "1<p>2</p>") is considered to be attached to the position immediately before the block element, which
+                    // corresponds with a different selection position in most browsers from the one we want (i.e. at the
+                    // start of the contents of the block element). We get round this by advancing the position returned to
+                    // the last possible equivalent visible position.
+                    if (unit == WORD) {
+                        charIterator = createCharacterIterator(pos, false, null, characterOptions);
+                        nextPos = charIterator.next();
+                        charIterator.dispose();
+                    }
+                    if (nextPos) {
+                        newPos = nextPos.previousVisible();
+                    }
+                }
+            }
+
+
+            return {
+                position: newPos,
+                unitsMoved: unitsMoved
+            };
+        }
+
+        function createRangeCharacterIterator(session, range, characterOptions, backward) {
+            var rangeStart = session.getRangeBoundaryPosition(range, true);
+            var rangeEnd = session.getRangeBoundaryPosition(range, false);
+            var itStart = backward ? rangeEnd : rangeStart;
+            var itEnd = backward ? rangeStart : rangeEnd;
+
+            return createCharacterIterator(itStart, !!backward, itEnd, characterOptions);
+        }
+
+        function getRangeCharacters(session, range, characterOptions) {
+
+            var chars = [], it = createRangeCharacterIterator(session, range, characterOptions), pos;
+            while ( (pos = it.next()) ) {
+                chars.push(pos);
+            }
+
+            it.dispose();
+            return chars;
+        }
+
+        function isWholeWord(startPos, endPos, wordOptions) {
+            var range = api.createRange(startPos.node);
+            range.setStartAndEnd(startPos.node, startPos.offset, endPos.node, endPos.offset);
+            var returnVal = !range.expand("word", wordOptions);
+            return returnVal;
+        }
+
+        function findTextFromPosition(initialPos, searchTerm, isRegex, searchScopeRange, findOptions) {
+            var backward = isDirectionBackward(findOptions.direction);
+            var it = createCharacterIterator(
+                initialPos,
+                backward,
+                initialPos.session.getRangeBoundaryPosition(searchScopeRange, backward),
+                findOptions.characterOptions
+            );
+            var text = "", chars = [], pos, currentChar, matchStartIndex, matchEndIndex;
+            var result, insideRegexMatch;
+            var returnValue = null;
+
+            function handleMatch(startIndex, endIndex) {
+                var startPos = chars[startIndex].previousVisible();
+                var endPos = chars[endIndex - 1];
+                var valid = (!findOptions.wholeWordsOnly || isWholeWord(startPos, endPos, findOptions.wordOptions));
+
+                return {
+                    startPos: startPos,
+                    endPos: endPos,
+                    valid: valid
+                };
+            }
+
+            while ( (pos = it.next()) ) {
+                currentChar = pos.character;
+                if (!isRegex && !findOptions.caseSensitive) {
+                    currentChar = currentChar.toLowerCase();
+                }
+
+                if (backward) {
+                    chars.unshift(pos);
+                    text = currentChar + text;
+                } else {
+                    chars.push(pos);
+                    text += currentChar;
+                }
+                
+                //console.log("text " + text)
+
+                if (isRegex) {
+                    result = searchTerm.exec(text);
+                    if (result) {
+                        matchStartIndex = result.index;
+                        matchEndIndex = matchStartIndex + result[0].length;
+                        if (insideRegexMatch) {
+                            // Check whether the match is now over
+                            if ((!backward && matchEndIndex < text.length) || (backward && matchStartIndex > 0)) {
+                                returnValue = handleMatch(matchStartIndex, matchEndIndex);
+                                break;
+                            }
+                        } else {
+                            insideRegexMatch = true;
+                        }
+                    }
+                } else if ( (matchStartIndex = text.indexOf(searchTerm)) != -1 ) {
+                    returnValue = handleMatch(matchStartIndex, matchStartIndex + searchTerm.length);
+                    break;
+                }
+            }
+
+            // Check whether regex match extends to the end of the range
+            if (insideRegexMatch) {
+                returnValue = handleMatch(matchStartIndex, matchEndIndex);
+            }
+            it.dispose();
+
+            return returnValue;
+        }
+
+        function createEntryPointFunction(func) {
+            return function() {
+                var sessionRunning = !!currentSession;
+                var session = getSession();
+                var args = [session].concat( util.toArray(arguments) );
+                var returnValue = func.apply(this, args);
+                if (!sessionRunning) {
+                    endSession();
+                }
+                return returnValue;
+            };
+        }
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // Extensions to the Rangy Range object
+
+        function createRangeBoundaryMover(isStart, collapse) {
+            /*
+             Unit can be "character" or "word"
+             Options:
+
+             - includeTrailingSpace
+             - wordRegex
+             - tokenizer
+             - collapseSpaceBeforeLineBreak
+             */
+            return createEntryPointFunction(
+                function(session, unit, count, moveOptions) {
+                    if (typeof count == UNDEF) {
+                        count = unit;
+                        unit = CHARACTER;
+                    }
+                    moveOptions = createNestedOptions(moveOptions, defaultMoveOptions);
+
+                    var boundaryIsStart = isStart;
+                    if (collapse) {
+                        boundaryIsStart = (count >= 0);
+                        this.collapse(!boundaryIsStart);
+                    }
+                    var moveResult = movePositionBy(session.getRangeBoundaryPosition(this, boundaryIsStart), unit, count, moveOptions.characterOptions, moveOptions.wordOptions);
+                    var newPos = moveResult.position;
+                    this[boundaryIsStart ? "setStart" : "setEnd"](newPos.node, newPos.offset);
+                    return moveResult.unitsMoved;
+                }
+            );
+        }
+
+        function createRangeTrimmer(isStart) {
+            return createEntryPointFunction(
+                function(session, characterOptions) {
+                    characterOptions = createOptions(characterOptions, defaultCharacterOptions);
+                    var pos;
+                    var it = createRangeCharacterIterator(session, this, characterOptions, !isStart);
+                    var trimCharCount = 0;
+                    while ( (pos = it.next()) && allWhiteSpaceRegex.test(pos.character) ) {
+                        ++trimCharCount;
+                    }
+                    it.dispose();
+                    var trimmed = (trimCharCount > 0);
+                    if (trimmed) {
+                        this[isStart ? "moveStart" : "moveEnd"](
+                            "character",
+                            isStart ? trimCharCount : -trimCharCount,
+                            { characterOptions: characterOptions }
+                        );
+                    }
+                    return trimmed;
+                }
+            );
+        }
+
+        extend(api.rangePrototype, {
+            moveStart: createRangeBoundaryMover(true, false),
+
+            moveEnd: createRangeBoundaryMover(false, false),
+
+            move: createRangeBoundaryMover(true, true),
+
+            trimStart: createRangeTrimmer(true),
+
+            trimEnd: createRangeTrimmer(false),
+
+            trim: createEntryPointFunction(
+                function(session, characterOptions) {
+                    var startTrimmed = this.trimStart(characterOptions), endTrimmed = this.trimEnd(characterOptions);
+                    return startTrimmed || endTrimmed;
+                }
+            ),
+
+            expand: createEntryPointFunction(
+                function(session, unit, expandOptions) {
+                    var moved = false;
+                    expandOptions = createNestedOptions(expandOptions, defaultExpandOptions);
+                    var characterOptions = expandOptions.characterOptions;
+                    if (!unit) {
+                        unit = CHARACTER;
+                    }
+                    if (unit == WORD) {
+                        var wordOptions = expandOptions.wordOptions;
+                        var startPos = session.getRangeBoundaryPosition(this, true);
+                        var endPos = session.getRangeBoundaryPosition(this, false);
+
+                        var startTokenizedTextProvider = createTokenizedTextProvider(startPos, characterOptions, wordOptions);
+                        var startToken = startTokenizedTextProvider.nextEndToken();
+                        var newStartPos = startToken.chars[0].previousVisible();
+                        var endToken, newEndPos;
+
+                        if (this.collapsed) {
+                            endToken = startToken;
+                        } else {
+                            var endTokenizedTextProvider = createTokenizedTextProvider(endPos, characterOptions, wordOptions);
+                            endToken = endTokenizedTextProvider.previousStartToken();
+                        }
+                        newEndPos = endToken.chars[endToken.chars.length - 1];
+
+                        if (!newStartPos.equals(startPos)) {
+                            this.setStart(newStartPos.node, newStartPos.offset);
+                            moved = true;
+                        }
+                        if (newEndPos && !newEndPos.equals(endPos)) {
+                            this.setEnd(newEndPos.node, newEndPos.offset);
+                            moved = true;
+                        }
+
+                        if (expandOptions.trim) {
+                            if (expandOptions.trimStart) {
+                                moved = this.trimStart(characterOptions) || moved;
+                            }
+                            if (expandOptions.trimEnd) {
+                                moved = this.trimEnd(characterOptions) || moved;
+                            }
+                        }
+
+                        return moved;
+                    } else {
+                        return this.moveEnd(CHARACTER, 1, expandOptions);
+                    }
+                }
+            ),
+
+            text: createEntryPointFunction(
+                function(session, characterOptions) {
+                    return this.collapsed ?
+                        "" : getRangeCharacters(session, this, createOptions(characterOptions, defaultCharacterOptions)).join("");
+                }
+            ),
+
+            selectCharacters: createEntryPointFunction(
+                function(session, containerNode, startIndex, endIndex, characterOptions) {
+                    var moveOptions = { characterOptions: characterOptions };
+                    if (!containerNode) {
+                        containerNode = getBody( this.getDocument() );
+                    }
+                    this.selectNodeContents(containerNode);
+                    this.collapse(true);
+                    this.moveStart("character", startIndex, moveOptions);
+                    this.collapse(true);
+                    this.moveEnd("character", endIndex - startIndex, moveOptions);
+                }
+            ),
+
+            // Character indexes are relative to the start of node
+            toCharacterRange: createEntryPointFunction(
+                function(session, containerNode, characterOptions) {
+                    if (!containerNode) {
+                        containerNode = getBody( this.getDocument() );
+                    }
+                    var parent = containerNode.parentNode, nodeIndex = dom.getNodeIndex(containerNode);
+                    var rangeStartsBeforeNode = (dom.comparePoints(this.startContainer, this.endContainer, parent, nodeIndex) == -1);
+                    var rangeBetween = this.cloneRange();
+                    var startIndex, endIndex;
+                    if (rangeStartsBeforeNode) {
+                        rangeBetween.setStartAndEnd(this.startContainer, this.startOffset, parent, nodeIndex);
+                        startIndex = -rangeBetween.text(characterOptions).length;
+                    } else {
+                        rangeBetween.setStartAndEnd(parent, nodeIndex, this.startContainer, this.startOffset);
+                        startIndex = rangeBetween.text(characterOptions).length;
+                    }
+                    endIndex = startIndex + this.text(characterOptions).length;
+        
+                    return {
+                        start: startIndex,
+                        end: endIndex
+                    };
+                }
+            ),
+
+            findText: createEntryPointFunction(
+                function(session, searchTermParam, findOptions) {
+                    // Set up options
+                    findOptions = createNestedOptions(findOptions, defaultFindOptions);
+        
+                    // Create word options if we're matching whole words only
+                    if (findOptions.wholeWordsOnly) {
+                        // We don't ever want trailing spaces for search results
+                        findOptions.wordOptions.includeTrailingSpace = false;
+                    }
+        
+                    var backward = isDirectionBackward(findOptions.direction);
+        
+                    // Create a range representing the search scope if none was provided
+                    var searchScopeRange = findOptions.withinRange;
+                    if (!searchScopeRange) {
+                        searchScopeRange = api.createRange();
+                        searchScopeRange.selectNodeContents(this.getDocument());
+                    }
+        
+                    // Examine and prepare the search term
+                    var searchTerm = searchTermParam, isRegex = false;
+                    if (typeof searchTerm == "string") {
+                        if (!findOptions.caseSensitive) {
+                            searchTerm = searchTerm.toLowerCase();
+                        }
+                    } else {
+                        isRegex = true;
+                    }
+        
+                    var initialPos = session.getRangeBoundaryPosition(this, !backward);
+        
+                    // Adjust initial position if it lies outside the search scope
+                    var comparison = searchScopeRange.comparePoint(initialPos.node, initialPos.offset);
+                    
+                    if (comparison === -1) {
+                        initialPos = session.getRangeBoundaryPosition(searchScopeRange, true);
+                    } else if (comparison === 1) {
+                        initialPos = session.getRangeBoundaryPosition(searchScopeRange, false);
+                    }
+        
+                    var pos = initialPos;
+                    var wrappedAround = false;
+        
+                    // Try to find a match and ignore invalid ones
+                    var findResult;
+                    while (true) {
+                        findResult = findTextFromPosition(pos, searchTerm, isRegex, searchScopeRange, findOptions);
+        
+                        if (findResult) {
+                            if (findResult.valid) {
+                                this.setStartAndEnd(findResult.startPos.node, findResult.startPos.offset, findResult.endPos.node, findResult.endPos.offset);
+                                return true;
+                            } else {
+                                // We've found a match that is not a whole word, so we carry on searching from the point immediately
+                                // after the match
+                                pos = backward ? findResult.startPos : findResult.endPos;
+                            }
+                        } else if (findOptions.wrap && !wrappedAround) {
+                            // No result found but we're wrapping around and limiting the scope to the unsearched part of the range
+                            searchScopeRange = searchScopeRange.cloneRange();
+                            pos = session.getRangeBoundaryPosition(searchScopeRange, !backward);
+                            searchScopeRange.setBoundary(initialPos.node, initialPos.offset, backward);
+                            wrappedAround = true;
+                        } else {
+                            // Nothing found and we can't wrap around, so we're done
+                            return false;
+                        }
+                    }
+                }
+            ),
+
+            pasteHtml: function(html) {
+                this.deleteContents();
+                if (html) {
+                    var frag = this.createContextualFragment(html);
+                    var lastChild = frag.lastChild;
+                    this.insertNode(frag);
+                    this.collapseAfter(lastChild);
+                }
+            }
+        });
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // Extensions to the Rangy Selection object
+
+        function createSelectionTrimmer(methodName) {
+            return createEntryPointFunction(
+                function(session, characterOptions) {
+                    var trimmed = false;
+                    this.changeEachRange(function(range) {
+                        trimmed = range[methodName](characterOptions) || trimmed;
+                    });
+                    return trimmed;
+                }
+            );
+        }
+
+        extend(api.selectionPrototype, {
+            expand: createEntryPointFunction(
+                function(session, unit, expandOptions) {
+                    this.changeEachRange(function(range) {
+                        range.expand(unit, expandOptions);
+                    });
+                }
+            ),
+
+            move: createEntryPointFunction(
+                function(session, unit, count, options) {
+                    var unitsMoved = 0;
+                    if (this.focusNode) {
+                        this.collapse(this.focusNode, this.focusOffset);
+                        var range = this.getRangeAt(0);
+                        if (!options) {
+                            options = {};
+                        }
+                        options.characterOptions = createOptions(options.characterOptions, defaultCaretCharacterOptions);
+                        unitsMoved = range.move(unit, count, options);
+                        this.setSingleRange(range);
+                    }
+                    return unitsMoved;
+                }
+            ),
+
+            trimStart: createSelectionTrimmer("trimStart"),
+            trimEnd: createSelectionTrimmer("trimEnd"),
+            trim: createSelectionTrimmer("trim"),
+
+            selectCharacters: createEntryPointFunction(
+                function(session, containerNode, startIndex, endIndex, direction, characterOptions) {
+                    var range = api.createRange(containerNode);
+                    range.selectCharacters(containerNode, startIndex, endIndex, characterOptions);
+                    this.setSingleRange(range, direction);
+                }
+            ),
+
+            saveCharacterRanges: createEntryPointFunction(
+                function(session, containerNode, characterOptions) {
+                    var ranges = this.getAllRanges(), rangeCount = ranges.length;
+                    var rangeInfos = [];
+        
+                    var backward = rangeCount == 1 && this.isBackward();
+        
+                    for (var i = 0, len = ranges.length; i < len; ++i) {
+                        rangeInfos[i] = {
+                            characterRange: ranges[i].toCharacterRange(containerNode, characterOptions),
+                            backward: backward,
+                            characterOptions: characterOptions
+                        };
+                    }
+        
+                    return rangeInfos;
+                }
+            ),
+
+            restoreCharacterRanges: createEntryPointFunction(
+                function(session, containerNode, saved) {
+                    this.removeAllRanges();
+                    for (var i = 0, len = saved.length, range, rangeInfo, characterRange; i < len; ++i) {
+                        rangeInfo = saved[i];
+                        characterRange = rangeInfo.characterRange;
+                        range = api.createRange(containerNode);
+                        range.selectCharacters(containerNode, characterRange.start, characterRange.end, rangeInfo.characterOptions);
+                        this.addRange(range, rangeInfo.backward);
+                    }
+                }
+            ),
+
+            text: createEntryPointFunction(
+                function(session, characterOptions) {
+                    var rangeTexts = [];
+                    for (var i = 0, len = this.rangeCount; i < len; ++i) {
+                        rangeTexts[i] = this.getRangeAt(i).text(characterOptions);
+                    }
+                    return rangeTexts.join("");
+                }
+            )
+        });
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+
+        // Extensions to the core rangy object
+
+        api.innerText = function(el, characterOptions) {
+            var range = api.createRange(el);
+            range.selectNodeContents(el);
+            var text = range.text(characterOptions);
+            return text;
+        };
+
+        api.createWordIterator = function(startNode, startOffset, iteratorOptions) {
+            var session = getSession();
+            iteratorOptions = createNestedOptions(iteratorOptions, defaultWordIteratorOptions);
+            var startPos = session.getPosition(startNode, startOffset);
+            var tokenizedTextProvider = createTokenizedTextProvider(startPos, iteratorOptions.characterOptions, iteratorOptions.wordOptions);
+            var backward = isDirectionBackward(iteratorOptions.direction);
+
+            return {
+                next: function() {
+                    return backward ? tokenizedTextProvider.previousStartToken() : tokenizedTextProvider.nextEndToken();
+                },
+
+                dispose: function() {
+                    tokenizedTextProvider.dispose();
+                    this.next = function() {};
+                }
+            };
+        };
+
+        /*----------------------------------------------------------------------------------------------------------------*/
+        
+        api.noMutation = function(func) {
+            var session = getSession();
+            func(session);
+            endSession();
+        };
+
+        api.noMutation.createEntryPointFunction = createEntryPointFunction;
+
+        api.textRange = {
+            isBlockNode: isBlockNode,
+            isCollapsedWhitespaceNode: isCollapsedWhitespaceNode,
+
+            createPosition: createEntryPointFunction(
+                function(session, node, offset) {
+                    return session.getPosition(node, offset);
+                }
+            )
+        };
+    });
+    
+}, this);
\ No newline at end of file