src/language/HTMLInstrumentation.js
/*
* Copyright (c) 2013 - present Adobe Systems Incorporated. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
/*unittests: HTML Instrumentation*/
/**
* HTMLInstrumentation
*
* This module contains functions for "instrumenting" html code so that we can track
* the relationship of source code to DOM nodes in the browser. This functionality is
* used by both live highlighting and live HTML editing.
*
* During live HTML development, the HTML source code is parsed to identify tag boundaries.
* Each tag is assigned an ID which is stored in markers that are inserted into the editor.
* These IDs are also included in "data-brackets-id" attributes that are inserted in the
* HTML code that's served to the browser via the Live Development server.
*
* The primary function for that functionality is generateInstrumentedHTML(). This does just
* what it says - it will read the HTML content in the doc and generate instrumented code by
* injecting "data-brackets-id" attributes. Additionally, it caches the parsed DOM for use
* by future updates.
*
* As the user makes edits in the editor, we determine how the DOM structure should change
* based on the edits to the source code; those edits are generated by getUnappliedEditList().
* HTMLDocument (in LiveDevelopment) takes those edits and sends them to the browser (via
* RemoteFunctions) so that the DOM structure in the live preview can be updated accordingly.
*
* There are also helper functions for returning the tagID associated with a specified
* position in the document--this is used in live highlighting.
*/
define(function (require, exports, module) {
"use strict";
var DocumentManager = require("document/DocumentManager"),
HTMLSimpleDOM = require("./HTMLSimpleDOM"),
HTMLDOMDiff = require("./HTMLDOMDiff"),
_ = require("thirdparty/lodash");
var allowIncremental = true;
// Hash of scanned documents. Key is the full path of the doc. Value is an object
// with two properties: timestamp and dom. Timestamp is the document timestamp,
// dom is the root node of a simple DOM tree.
var _cachedValues = {};
/**
* @private
* Removes the cached information (DOM, timestamp, etc.) used by HTMLInstrumentation
* for the given document.
* @param {$.Event} event (unused)
* @param {Document} document The document to clear from the cache.
*/
function _removeDocFromCache(evt, document) {
if (_cachedValues.hasOwnProperty(document.file.fullPath)) {
delete _cachedValues[document.file.fullPath];
document.off(".htmlInstrumentation");
}
}
/**
* @private
* Checks if two CodeMirror-style {line, ch} positions are equal.
* @param {{line: number, ch: number}} pos1
* @param {{line: number, ch: number}} pos2
* @return {boolean} true if pos1 and pos2 are equal. Fails if either of them is falsy.
*/
function _posEq(pos1, pos2) {
return pos1 && pos2 && pos1.line === pos2.line && pos1.ch === pos2.ch;
}
function getPositionFromTagId(editor, tagId) {
var marks = editor._codeMirror.getAllMarks(),
i,
markFound;
markFound = _.find(marks, function (mark) {
return (mark.tagID === tagId);
});
if (markFound) {
return markFound.find().from;
} else {
return null;
}
}
/**
* @private
* Filters the given marks to find the ones that correspond to instrumented tags,
* sorts them by their starting position, and looks up and/or stores their ranges
* in the given markCache.
* @param {Array} marks An array of mark objects returned by CodeMirror.
* @param {Object} markCache An object that maps tag IDs to {mark, range} objects.
* If a mark in the marks array is already in the cache, we use the cached range info,
* otherwise we look up its range in CodeMirror and store it in the cache.
* @return {Array.<{mark: Object, range: {line: number, ch: number}}>} The filtered and
* sorted array of mark info objects (each of which contains the mark and its range,
* so the range doesn't need to be looked up again).
*/
function _getSortedTagMarks(marks, markCache) {
marks = marks.filter(function (mark) {
return !!mark.tagID;
}).map(function (mark) {
// All marks should exist since we just got them from CodeMirror.
if (!markCache[mark.tagID]) {
markCache[mark.tagID] = {mark: mark, range: mark.find()};
}
return markCache[mark.tagID];
});
marks.sort(function (mark1, mark2) {
return (mark1.range.from.line === mark2.range.from.line ?
mark1.range.from.ch - mark2.range.from.ch :
mark1.range.from.line - mark2.range.from.line);
});
return marks;
}
/**
* @private
* Finds the mark for the DOM node at the given position in the editor.
* @param {Editor} editor The editor containing the instrumented document.
* @param {{line: number, ch: number}} pos The position to find the DOM marker for.
* @param {boolean} preferParent If true, and the pos is at one or the other edge of the
* innermost marked range, return the immediately enclosing mark instead.
* @param {Object=} markCache An optional cache to look up positions of existing
* markers. (This avoids calling the find() operation on marks multiple times,
* which is expensive.)
* @return {Object} The CodeMirror mark object that represents the DOM node at the
* given position.
*/
function _getMarkerAtDocumentPos(editor, pos, preferParent, markCache) {
var marks, match;
markCache = markCache || {};
marks = _getSortedTagMarks(editor._codeMirror.findMarksAt(pos), markCache);
if (!marks.length) {
return null;
}
// The mark with the latest start is the innermost one.
match = marks.pop();
if (preferParent) {
// If the match is exactly at the edge of the range and preferParent is set,
// we want to pop upwards. If pos is exactly between two marks, we need to pop upwards twice.
while (match && (_posEq(match.range.from, pos) || _posEq(match.range.to, pos))) {
match = marks.pop();
}
}
return match && match.mark;
}
/**
* @private
* Dumps the current list of mark ranges for instrumented tags to the console. Used for debugging.
* @param {Editor} editor The editor to find the mark ranges for.
* @param {Object=} nodeMap If specified, a map of tag IDs to DOM nodes, used so we can indicate which tag name
* the DOM thinks corresponds to the given mark.
*/
function _dumpMarks(editor, nodeMap) {
var markCache = {},
marks = _getSortedTagMarks(editor._codeMirror.getAllMarks(), markCache);
marks.forEach(function (markInfo) {
var mark = markInfo.mark,
range = markInfo.range;
console.log("<" + nodeMap[mark.tagID].tag + "> (" + mark.tagID + ") " +
range.from.line + ":" + range.from.ch + " - " + range.to.line + ":" + range.to.ch);
});
}
// Workaround for JSHint to not complain about the unused function
void(_dumpMarks);
/**
* Get the instrumented tagID at the specified position. Returns -1 if
* there are no instrumented tags at the location.
* The _markText() function must be called before calling this function.
*
* NOTE: This function is "private" for now (has a leading underscore), since
* the API is likely to change in the future.
*
* @param {Editor} editor The editor to scan.
* @param {{line: number, ch: number}} pos The position to find the DOM marker for.
* @param {Object=} markCache An optional cache to look up positions of existing
* markers. (This avoids calling the find() operation on marks multiple times,
* which is expensive.)
* @return {number} tagID at the specified position, or -1 if there is no tag
*/
function _getTagIDAtDocumentPos(editor, pos, markCache) {
var match = _getMarkerAtDocumentPos(editor, pos, false, markCache);
return (match) ? match.tagID : -1;
}
/**
* Recursively walks the SimpleDOM starting at node and marking
* all tags in the CodeMirror instance. The more useful interface
* is the _markTextFromDOM function which clears existing marks
* before calling this function to create new ones.
*
* @param {CodeMirror} cm CodeMirror instance in which to mark tags
* @param {Object} node SimpleDOM node to use as the root for marking
*/
function _markTags(cm, node) {
node.children.forEach(function (childNode) {
if (childNode.isElement()) {
_markTags(cm, childNode);
}
});
var mark = cm.markText(node.startPos, node.endPos);
mark.tagID = node.tagID;
}
/**
* Clears the marks from the document and creates new ones.
*
* @param {Editor} editor Editor object holding this document
* @param {Object} dom SimpleDOM root object that contains the parsed structure
*/
function _markTextFromDOM(editor, dom) {
var cm = editor._codeMirror;
// Remove existing marks
var marks = cm.getAllMarks();
cm.operation(function () {
marks.forEach(function (mark) {
if (mark.hasOwnProperty("tagID")) {
mark.clear();
}
});
});
// Mark
_markTags(cm, dom);
}
/**
* Subclass of HTMLSimpleDOM.Builder that builds an updated DOM after changes have been made,
* and maps nodes from the new DOM to the old DOM by tag ID. For non-structural edits, avoids reparsing
* the whole editor. Also updates marks in the editor based on the new DOM state.
*
* @constructor
* @param {Object} previousDOM The root of the HTMLSimpleDOM tree representing a previous state of the DOM.
* @param {Editor} editor The editor containing the instrumented HTML.
* @param {Array=} changeList An optional array of CodeMirror change records representing the
* edits the user made in the editor since previousDOM was built. If provided, and the
* edits are not structural, DOMUpdater will do a fast incremental reparse. If not provided,
* or if one of the edits changes the DOM structure, DOMUpdater will reparse the whole DOM.
*/
function DOMUpdater(previousDOM, editor, changeList) {
var text, startOffset = 0, startOffsetPos;
this.isIncremental = false;
function isDangerousEdit(text) {
// We don't consider & dangerous since entities only affect text content, not
// overall DOM structure.
return (/[<>\/=\"\']/).test(text);
}
// If there's more than one change, be conservative and assume we have to do a full reparse.
if (changeList && changeList.length === 1) {
// If the inserted or removed text doesn't have any characters that could change the
// structure of the DOM (e.g. by adding or removing a tag boundary), then we can do
// an incremental reparse of just the parent tag containing the edit. This should just
// be the marked range that contains the beginning of the edit range, since that position
// isn't changed by the edit.
var change = changeList[0];
if (!isDangerousEdit(change.text) && !isDangerousEdit(change.removed)) {
// If the edit is right at the beginning or end of a tag, we want to be conservative
// and use the parent as the edit range.
var startMark = _getMarkerAtDocumentPos(editor, change.from, true);
if (startMark) {
var range = startMark.find();
if (range) {
text = editor._codeMirror.getRange(range.from, range.to);
this.changedTagID = startMark.tagID;
startOffsetPos = range.from;
startOffset = editor._codeMirror.indexFromPos(startOffsetPos);
this.isIncremental = true;
}
}
}
}
if (!this.changedTagID) {
// We weren't able to incrementally update, so just rebuild and diff everything.
text = editor.document.getText();
}
HTMLSimpleDOM.Builder.call(this, text, startOffset, startOffsetPos);
this.editor = editor;
this.cm = editor._codeMirror;
this.previousDOM = previousDOM;
}
DOMUpdater.prototype = Object.create(HTMLSimpleDOM.Builder.prototype);
/**
* @private
* Returns true if the given node has an ancestor whose tagID is the given ID.
* @param {Object} node A node from an HTMLSimpleDOM structure.
* @param {number} id The ID of the tag to check for.
* @return {boolean} true if the node has an ancestor with that ID.
*/
function _hasAncestorWithID(node, id) {
var ancestor = node.parent;
while (ancestor && ancestor.tagID !== id) {
ancestor = ancestor.parent;
}
return !!ancestor;
}
/**
* Overrides the `getID` method to return the tag ID from the document. If a viable tag
* ID cannot be found in the document marks, then a new ID is returned. This will also
* assign a new ID if the tag changed between the previous and current versions of this
* node.
*
* @param {Object} newTag tag object for the current element
* @return {int} best ID
*/
DOMUpdater.prototype.getID = function (newTag, markCache) {
// Get the mark at the start of the tagname (not before the beginning of the tag, because that's
// actually inside the parent).
var currentTagID = _getTagIDAtDocumentPos(this.editor, HTMLSimpleDOM._offsetPos(newTag.startPos, 1), markCache);
// If the new tag is in an unmarked range, or the marked range actually corresponds to an
// ancestor tag, then this must be a newly inserted tag, so give it a new tag ID.
if (currentTagID === -1 || _hasAncestorWithID(newTag, currentTagID)) {
currentTagID = this.getNewID();
} else {
// If the tag has changed between the previous DOM and the new one, we assign a new ID
// so that the old tag will be deleted and the new one inserted.
var oldNode = this.previousDOM.nodeMap[currentTagID];
if (!oldNode || oldNode.tag !== newTag.tag) {
currentTagID = this.getNewID();
}
}
return currentTagID;
};
/**
* Updates the CodeMirror marks in the editor to reflect the new bounds of nodes in
* the given nodeMap.
* @param {Object} nodeMap The node map from the new DOM.
* @param {Object} markCache The cache of existing mark ranges built during the latest parse.
*/
DOMUpdater.prototype._updateMarkedRanges = function (nodeMap, markCache) {
// FUTURE: this is somewhat inefficient (getting all the marks involves passing linearly through
// the document once), but it doesn't seem to be a hotspot right now.
var updateIDs = Object.keys(nodeMap),
cm = this.cm,
marks = cm.getAllMarks();
cm.operation(function () {
marks.forEach(function (mark) {
if (mark.hasOwnProperty("tagID") && nodeMap[mark.tagID]) {
var node = nodeMap[mark.tagID],
markInfo = markCache[mark.tagID];
// If the mark's bounds already match, avoid destroying and recreating the mark,
// since that incurs some overhead.
if (!(markInfo && _posEq(markInfo.range.from, node.startPos) && _posEq(markInfo.range.to, node.endPos))) {
mark.clear();
mark = cm.markText(node.startPos, node.endPos);
mark.tagID = node.tagID;
}
updateIDs.splice(updateIDs.indexOf(String(node.tagID)), 1);
}
});
// Any remaining updateIDs are new.
updateIDs.forEach(function (id) {
var node = nodeMap[id], mark;
if (node.isElement()) {
mark = cm.markText(node.startPos, node.endPos);
mark.tagID = Number(id);
}
});
});
};
/**
* @private
* Creates a map from tagIDs to nodes in the given HTMLSimpleDOM subtree and
* stores it on the root.
* @param {Object} root The root of an HTMLSimpleDOM tree.
*/
DOMUpdater.prototype._buildNodeMap = function (root) {
var nodeMap = {};
function walk(node) {
if (node.tagID) {
nodeMap[node.tagID] = node;
}
if (node.isElement()) {
node.children.forEach(walk);
}
}
walk(root);
root.nodeMap = nodeMap;
};
/**
* @private
* Removes all nodes deleted between the oldSubtree and the newSubtree from the given nodeMap,
* and clears marks associated with those nodes.
* @param {Object} nodeMap The nodeMap to update to remove deleted items.
* @param {Object} oldSubtreeMap The nodeMap for the original subtree (which should be a subset of the
* first nodeMap).
* @param {Object} newSubtreeMap The nodeMap for the new subtree.
*/
DOMUpdater.prototype._handleDeletions = function (nodeMap, oldSubtreeMap, newSubtreeMap) {
var deletedIDs = [];
Object.keys(oldSubtreeMap).forEach(function (key) {
if (!newSubtreeMap.hasOwnProperty(key)) {
deletedIDs.push(key);
delete nodeMap[key];
}
});
if (deletedIDs.length) {
// FUTURE: would be better to cache the mark for each node. Also, could
// conceivably combine this with _updateMarkedRanges().
var marks = this.cm.getAllMarks();
marks.forEach(function (mark) {
if (mark.hasOwnProperty("tagID") && deletedIDs.indexOf(mark.tagID) !== -1) {
mark.clear();
}
});
}
};
/**
* Reparses the document (or a portion of it if we can do it incrementally).
* Note that in an incremental update, the old DOM is actually mutated (the new
* subtree is swapped in for the old subtree).
* @return {?{newDOM: Object, oldSubtree: Object, newSubtree: Object}} newDOM is
* the full new DOM. For a full update, oldSubtree is the full old DOM
* and newSubtree is the same as newDOM; for an incremental update,
* oldSubtree is the portion of the old tree that was reparsed,
* newSubtree is the updated version, and newDOM is actually the same
* as the original DOM (with newSubtree swapped in for oldSubtree).
* If the document can't be parsed due to invalid HTML, returns null.
*/
DOMUpdater.prototype.update = function () {
var markCache = {},
newSubtree = this.build(true, markCache),
result = {
// default result if we didn't identify a changed portion
newDOM: newSubtree,
oldSubtree: this.previousDOM,
newSubtree: newSubtree
};
if (!newSubtree) {
return null;
}
if (this.changedTagID) {
// Find the old subtree that's going to get swapped out.
var oldSubtree = this.previousDOM.nodeMap[this.changedTagID],
parent = oldSubtree.parent;
// If we didn't have a parent, then the whole tree changed anyway, so
// we'll just return the default result.
if (parent) {
var childIndex = parent.children.indexOf(oldSubtree);
if (childIndex === -1) {
// This should never happen...
console.error("DOMUpdater.update(): couldn't locate old subtree in tree");
} else {
// Swap the new subtree in place of the old subtree.
oldSubtree.parent = null;
newSubtree.parent = parent;
parent.children[childIndex] = newSubtree;
// Overwrite any node mappings in the parent DOM with the
// mappings for the new subtree. We keep the nodeMap around
// on the new subtree so that the differ can use it later.
$.extend(this.previousDOM.nodeMap, newSubtree.nodeMap);
// Update marked ranges for all items in the new subtree.
this._updateMarkedRanges(newSubtree.nodeMap, markCache);
// Build a local nodeMap for the old subtree so the differ can
// use it.
this._buildNodeMap(oldSubtree);
// Clean up the info for any deleted nodes that are no longer in
// the new tree.
this._handleDeletions(this.previousDOM.nodeMap, oldSubtree.nodeMap, newSubtree.nodeMap);
// Update the signatures for all parents of the new subtree.
var curParent = parent;
while (curParent) {
curParent.update();
curParent = curParent.parent;
}
result.newDOM = this.previousDOM;
result.oldSubtree = oldSubtree;
}
}
} else {
_markTextFromDOM(this.editor, result.newDOM);
}
return result;
};
/**
* @private
* Builds a new DOM for the current state of the editor, diffs it against the
* previous DOM, and generates a DOM edit list that can be used to replay the
* diffs in the browser.
* @param {Object} previousDOM The HTMLSimpleDOM corresponding to the previous state of the editor.
* Note that in the case of an incremental edit, this will be mutated to create the new DOM
* (by swapping out the subtree corresponding to the changed portion).
* @param {Editor} editor The editor containing the instrumented HTML.
* @param {Array=} changeList If specified, a CodeMirror changelist reflecting all the
* text changes in the editor since previousDOM was built. If specified, we will
* attempt to do an incremental update (although we might fall back to a full update
* in various cases). If not specified, we will always do a full update.
* @return {{dom: Object, edits: Array}} The new DOM representing the current state of the
* editor, and an array of edits that can be applied to update the browser (see
* HTMLDOMDiff for more information on the edit format).
*/
function _updateDOM(previousDOM, editor, changeList) {
if (!allowIncremental) {
changeList = undefined;
}
var updater = new DOMUpdater(previousDOM, editor, changeList);
var result = updater.update();
if (!result) {
return { errors: updater.errors };
}
var edits = HTMLDOMDiff.domdiff(result.oldSubtree, result.newSubtree);
// We're done with the nodeMap that was added to the subtree by the updater.
if (result.newSubtree !== result.newDOM) {
delete result.newSubtree.nodeMap;
}
return {
dom: result.newDOM,
edits: edits,
_wasIncremental: updater.isIncremental // for unit tests only
};
}
/**
* Calculates the DOM edits that are needed to update the browser from the state the
* editor was in the last time that scanDocument(), getInstrumentedHTML(), or
* getUnappliedEditList() was called (whichever is most recent). Caches this state so
* it can be used as the base state for the next getUnappliedEditList().
*
* For simple text edits, this update is done quickly and incrementally. For structural
* edits (edits that change the DOM structure or add/remove attributes), the update
* requires a full reparse.
*
* If the document currently contains invalid HTML, no edits will be generated until
* getUnappliedEditList() is called when the document is valid, at which point the edits
* will reflect all the changes needed to catch the browser up with all the edits
* made while the document was invalid.
*
* @param {Editor} editor The editor containing the instrumented HTML
* @param {Array} changeList A CodeMirror change list describing the text changes made
* in the editor since the last update. If specified, we will attempt to do an
* incremental update.
* @return {Array} edits A list of edits to apply in the browser. See HTMLDOMDiff for
* more information on the format of these edits.
*/
function getUnappliedEditList(editor, changeList) {
var cachedValue = _cachedValues[editor.document.file.fullPath];
// We might not have a previous DOM if the document was empty before this edit.
if (!cachedValue || !cachedValue.dom || _cachedValues[editor.document.file.fullPath].invalid) {
// We were in an invalid state, so do a full rebuild.
changeList = null;
}
var result = _updateDOM(cachedValue && cachedValue.dom, editor, changeList);
if (!result.errors) {
_cachedValues[editor.document.file.fullPath] = {
timestamp: editor.document.diskTimestamp,
dom: result.dom,
dirty: false
};
return { edits: result.edits };
} else {
if (cachedValue) {
cachedValue.invalid = true;
}
return { errors: result.errors };
}
}
/**
* @private
* Add SimpleDOMBuilder metadata to browser DOM tree JSON representation
* @param {Object} root
*/
function _processBrowserSimpleDOM(browserRoot, editorRootTagID) {
var nodeMap = {},
root;
function _processElement(elem) {
elem.tagID = elem.attributes["data-brackets-id"];
// remove data-brackets-id attribute for diff
delete elem.attributes["data-brackets-id"];
elem.children.forEach(function (child) {
// set parent
child.parent = elem;
if (child.isElement()) {
_processElement(child);
} else if (child.isText()) {
child.update();
child.tagID = HTMLSimpleDOM.getTextNodeID(child);
nodeMap[child.tagID] = child;
}
});
elem.update();
nodeMap[elem.tagID] = elem;
// Choose the root element based on the root tag in the editor.
// The browser may insert html, head and body elements if missing.
if (elem.tagID === editorRootTagID) {
root = elem;
}
}
_processElement(browserRoot);
root = root || browserRoot;
root.nodeMap = nodeMap;
return root;
}
/**
* @private
* Diff the browser DOM with the in-editor DOM
* @param {Editor} editor
* @param {Object} browserSimpleDOM
*/
function _getBrowserDiff(editor, browserSimpleDOM) {
var cachedValue = _cachedValues[editor.document.file.fullPath],
editorRoot = cachedValue.dom,
browserRoot;
browserRoot = _processBrowserSimpleDOM(browserSimpleDOM, editorRoot.tagID);
return {
diff : HTMLDOMDiff.domdiff(editorRoot, browserRoot),
browser : browserRoot,
editor : editorRoot
};
}
DocumentManager.on("beforeDocumentDelete", _removeDocFromCache);
/**
* Parses the document, returning an HTMLSimpleDOM structure and caching it as the
* initial state of the document. Will return a cached copy of the DOM if the
* document hasn't changed since the last time scanDocument was called.
*
* This is called by generateInstrumentedHTML(), but it can be useful to call it
* ahead of time so the DOM is cached and doesn't need to be rescanned when the
* instrumented HTML is requested by the browser.
*
* @param {Document} doc The doc to scan.
* @return {Object} Root DOM node of the document.
*/
function scanDocument(doc) {
if (!_cachedValues.hasOwnProperty(doc.file.fullPath)) {
doc.on("change.htmlInstrumentation", function () {
if (_cachedValues[doc.file.fullPath]) {
_cachedValues[doc.file.fullPath].dirty = true;
}
});
// Assign to cache, but don't set a value yet
_cachedValues[doc.file.fullPath] = null;
}
var cachedValue = _cachedValues[doc.file.fullPath];
if (!doc.isDirty && cachedValue && !cachedValue.dirty && cachedValue.timestamp === doc.diskTimestamp) {
return cachedValue.dom;
}
var text = doc.getText(),
dom = HTMLSimpleDOM.build(text);
if (dom) {
// Cache results
_cachedValues[doc.file.fullPath] = {
timestamp: doc.diskTimestamp,
dom: dom,
dirty: false
};
}
return dom;
}
/**
* Generate instrumented HTML for the specified editor's document, and mark the associated tag
* ranges in the editor. Each tag has a "data-brackets-id" attribute with a unique ID for its
* value. For example, "<div>" becomes something like "<div data-brackets-id='45'>". The attribute
* value is just a number that is guaranteed to be unique.
*
* Also stores marks in the given editor that correspond to the tag ranges. These marks are used
* to track the DOM structure for in-browser highlighting and live HTML updating.
*
* This only needs to be done once on load of a document. As the document is edited in memory,
* the instrumentation is kept up to date via the diffs and edits that are generated on change
* events. Call this again only if you want to do a full re-sync of the editor's DOM state.
*
* @param {Editor} editor The editor whose document we're instrumenting, and which we should
* mark ranges in.
* @return {string} instrumented html content
*/
function generateInstrumentedHTML(editor) {
var doc = editor.document,
dom = scanDocument(doc),
orig = doc.getText(),
gen = "",
lastIndex = 0;
if (!dom) {
return null;
}
// Ensure that the marks in the editor are up to date with respect to the given DOM.
_markTextFromDOM(editor, dom);
// Walk through the dom nodes and insert the 'data-brackets-id' attribute at the
// end of the open tag
function walk(node) {
if (node.tag) {
var attrText = " data-brackets-id='" + node.tagID + "'";
// Insert the attribute as the first attribute in the tag.
var insertIndex = node.start + node.tag.length + 1;
gen += orig.substr(lastIndex, insertIndex - lastIndex) + attrText;
lastIndex = insertIndex;
}
if (node.isElement()) {
node.children.forEach(walk);
}
}
walk(dom);
gen += orig.substr(lastIndex);
return gen;
}
/**
* Mark the text for the specified editor. Either scanDocument() or
* generateInstrumentedHTML() must be called before this function
* is called.
*
* NOTE: This function is "private" for now (has a leading underscore), since
* the API is likely to change in the future.
*
* @param {Editor} editor The editor whose text should be marked.
* @return none
*/
function _markText(editor) {
var cache = _cachedValues[editor.document.file.fullPath],
dom = cache && cache.dom;
if (!dom) {
console.error("Couldn't find the dom for " + editor.document.file.fullPath);
return;
}
_markTextFromDOM(editor, dom);
}
/**
* @private
* Clear the DOM cache. For unit testing only.
*/
function _resetCache() {
_cachedValues = {};
}
// private methods
exports._markText = _markText;
exports._getMarkerAtDocumentPos = _getMarkerAtDocumentPos;
exports._getTagIDAtDocumentPos = _getTagIDAtDocumentPos;
exports.getPositionFromTagId = getPositionFromTagId;
exports._markTextFromDOM = _markTextFromDOM;
exports._updateDOM = _updateDOM;
exports._allowIncremental = allowIncremental;
exports._getBrowserDiff = _getBrowserDiff;
exports._resetCache = _resetCache;
// public API
exports.scanDocument = scanDocument;
exports.generateInstrumentedHTML = generateInstrumentedHTML;
exports.getUnappliedEditList = getUnappliedEditList;
});