Stackedit/public/res/editor.js
2014-03-28 00:49:49 +00:00

863 lines
31 KiB
JavaScript

/* jshint -W084, -W099 */
define([
'jquery',
'underscore',
'settings',
'eventMgr',
'prism-core',
'diff_match_patch_uncompressed',
'jsondiffpatch',
'crel',
'MutationObservers',
'libs/prism-markdown'
], function ($, _, settings, eventMgr, Prism, diff_match_patch, jsondiffpatch, crel) {
function strSplice(str, i, remove, add) {
remove = +remove || 0;
add = add || '';
return str.slice(0, i) + add + str.slice(i + remove);
}
var editor = {};
var selectionStart = 0;
var selectionEnd = 0;
var scrollTop = 0;
var inputElt;
var $inputElt;
var previewElt;
var pagedownEditor;
var refreshPreviewLater = (function() {
var elapsedTime = 0;
var refreshPreview = function() {
var startTime = Date.now();
pagedownEditor.refreshPreview();
elapsedTime = Date.now() - startTime;
};
if(settings.lazyRendering === true) {
return _.debounce(refreshPreview, 500);
}
return function() {
setTimeout(refreshPreview, elapsedTime < 2000 ? elapsedTime : 2000);
};
})();
eventMgr.addListener('onPagedownConfigure', function(editor) {
pagedownEditor = editor;
});
eventMgr.addListener('onSectionsCreated', function(newSectionList) {
updateSectionList(newSectionList);
highlightSections();
if(fileChanged === true) {
// Refresh preview synchronously
pagedownEditor.refreshPreview();
}
else {
refreshPreviewLater();
}
});
var fileChanged = true;
var fileDesc;
eventMgr.addListener('onFileSelected', function(selectedFileDesc) {
fileChanged = true;
fileDesc = selectedFileDesc;
});
var contentObserver;
function noWatch(cb) {
contentObserver.disconnect();
cb();
contentObserver.observe(editor.contentElt, {
childList: true,
subtree: true,
characterData: true
});
}
var diffMatchPatch = new diff_match_patch();
var jsonDiffPatch = jsondiffpatch.create({
objectHash: function(obj) {
return JSON.stringify(obj);
},
arrays: {
detectMove: false,
},
textDiff: {
minLength: 9999999
}
});
var previousTextContent;
var currentMode;
editor.undoManager = (function() {
var undoManager = {
onButtonStateChange: function() {}
};
var undoStack = [];
var redoStack = [];
var lastTime;
var lastMode;
var currentState;
var selectionStartBefore;
var selectionEndBefore;
undoManager.setCommandMode = function() {
currentMode = 'command';
};
undoManager.setMode = function() {}; // For compatibility with PageDown
undoManager.saveState = function() {
redoStack = [];
var currentTime = Date.now();
if(currentMode == 'comment' || (currentMode != lastMode && lastMode != 'newlines') || currentTime - lastTime > 1000) {
undoStack.push(currentState);
// Limit the size of the stack
if(undoStack.length === 100) {
undoStack.shift();
}
}
else {
selectionStartBefore = currentState.selectionStartBefore;
selectionEndBefore = currentState.selectionEndBefore;
}
currentState = {
selectionStartBefore: selectionStartBefore,
selectionEndBefore: selectionEndBefore,
selectionStartAfter: selectionStart,
selectionEndAfter: selectionEnd,
content: previousTextContent,
discussionListJSON: fileDesc.discussionListJSON
};
lastTime = currentTime;
lastMode = currentMode;
currentMode = undefined;
undoManager.onButtonStateChange();
};
undoManager.saveSelectionState = _.debounce(function() {
if(currentMode === undefined) {
selectionStartBefore = selectionStart;
selectionEndBefore = selectionEnd;
}
}, 10);
undoManager.canUndo = function() {
return undoStack.length;
};
undoManager.canRedo = function() {
return redoStack.length;
};
function restoreState(state, selectionStart, selectionEnd) {
// Update editor
noWatch(function() {
if(previousTextContent != state.content) {
inputElt.value = state.content;
fileDesc.content = state.content;
eventMgr.onContentChanged(fileDesc, state.content);
previousTextContent = state.content;
}
inputElt.setSelectionStartEnd(selectionStart, selectionEnd);
var discussionListJSON = fileDesc.discussionListJSON;
if(discussionListJSON != state.discussionListJSON) {
currentMode = 'undoredo'; // In order to avoid saveState
var oldDiscussionList = fileDesc.discussionList;
fileDesc.discussionListJSON = state.discussionListJSON;
var newDiscussionList = fileDesc.discussionList;
var diff = jsonDiffPatch.diff(oldDiscussionList, newDiscussionList);
var commentsChanged = false;
_.each(diff, function(discussionDiff, discussionIndex) {
if(!_.isArray(discussionDiff)) {
commentsChanged = true;
}
else if(discussionDiff.length === 1) {
eventMgr.onDiscussionCreated(fileDesc, newDiscussionList[discussionIndex]);
}
else {
eventMgr.onDiscussionRemoved(fileDesc, oldDiscussionList[discussionIndex]);
}
});
commentsChanged && eventMgr.onCommentsChanged(fileDesc);
}
});
selectionStartBefore = selectionStart;
selectionEndBefore = selectionEnd;
currentState = state;
currentMode = undefined;
lastMode = undefined;
undoManager.onButtonStateChange();
adjustCursorPosition();
}
undoManager.undo = function() {
var state = undoStack.pop();
if(!state) {
return;
}
redoStack.push(currentState);
restoreState(state, currentState.selectionStartBefore, currentState.selectionEndBefore);
};
undoManager.redo = function() {
var state = redoStack.pop();
if(!state) {
return;
}
undoStack.push(currentState);
restoreState(state, state.selectionStartAfter, state.selectionEndAfter);
};
undoManager.init = function() {
var content = fileDesc.content;
undoStack = [];
redoStack = [];
lastTime = 0;
currentState = {
selectionStartAfter: fileDesc.selectionStart,
selectionEndAfter: fileDesc.selectionEnd,
content: content,
discussionListJSON: fileDesc.discussionListJSON
};
currentMode = undefined;
lastMode = undefined;
editor.contentElt.textContent = content;
};
return undoManager;
})();
function onComment() {
if(!currentMode) {
currentMode = 'comment';
editor.undoManager.saveState();
}
}
eventMgr.addListener('onDiscussionCreated', onComment);
eventMgr.addListener('onDiscussionRemoved', onComment);
eventMgr.addListener('onCommentsChanged', onComment);
function saveSelectionState() {
if(fileChanged === false) {
var selection = window.getSelection();
if (selection.rangeCount > 0) {
var range = selection.getRangeAt(0);
var element = range.startContainer;
if ((inputElt.compareDocumentPosition(element) & 0x10)) {
var container = element;
var offset = range.startOffset;
do {
while (element = element.previousSibling) {
if (element.textContent) {
offset += element.textContent.length;
}
}
element = container = container.parentNode;
} while (element && element != inputElt);
selectionStart = offset;
selectionEnd = offset + (range + '').length;
}
}
fileDesc.editorStart = selectionStart;
fileDesc.editorEnd = selectionEnd;
}
editor.undoManager.saveSelectionState();
}
function checkContentChange() {
saveSelectionState();
var currentTextContent = inputElt.textContent;
if(fileChanged === false) {
if(currentTextContent == previousTextContent) {
return;
}
if(!/\n$/.test(currentTextContent)) {
currentTextContent += '\n';
}
currentMode = currentMode || 'typing';
var changes = diffMatchPatch.diff_main(previousTextContent, currentTextContent);
// Move comments according to changes
var updateDiscussionList = false;
var startOffset = 0;
var discussionList = _.values(fileDesc.discussionList);
fileDesc.newDiscussion && discussionList.push(fileDesc.newDiscussion);
changes.forEach(function(change) {
var changeType = change[0];
var changeText = change[1];
if(changeType === 0) {
startOffset += changeText.length;
return;
}
var endOffset = startOffset;
var diffOffset = changeText.length;
if(changeType === -1) {
endOffset += diffOffset;
diffOffset = -diffOffset;
}
discussionList.forEach(function(discussion) {
// selectionEnd
if(discussion.selectionEnd >= endOffset) {
discussion.selectionEnd += diffOffset;
updateDiscussionList = true;
}
else if(discussion.selectionEnd > startOffset) {
discussion.selectionEnd = startOffset;
updateDiscussionList = true;
}
// selectionStart
if(discussion.selectionStart >= endOffset) {
discussion.selectionStart += diffOffset;
updateDiscussionList = true;
}
else if(discussion.selectionStart > startOffset) {
discussion.selectionStart = startOffset;
updateDiscussionList = true;
}
});
startOffset = endOffset;
});
if(updateDiscussionList === true) {
fileDesc.discussionList = fileDesc.discussionList; // Write discussionList in localStorage
}
fileDesc.content = currentTextContent;
eventMgr.onContentChanged(fileDesc, currentTextContent);
updateDiscussionList && eventMgr.onCommentsChanged(fileDesc);
previousTextContent = currentTextContent;
editor.undoManager.saveState();
}
else {
if(!/\n$/.test(currentTextContent)) {
currentTextContent += '\n';
fileDesc.content = currentTextContent;
}
selectionStart = fileDesc.editorStart;
selectionEnd = fileDesc.editorEnd;
eventMgr.onFileOpen(fileDesc, currentTextContent);
previewElt.scrollTop = fileDesc.previewScrollTop;
scrollTop = fileDesc.editorScrollTop;
inputElt.scrollTop = scrollTop;
previousTextContent = currentTextContent;
fileChanged = false;
}
}
function findOffset(ss) {
var offset = 0,
element = editor.contentElt,
container;
do {
container = element;
element = element.firstChild;
if (element) {
do {
var len = element.textContent.length;
if (offset <= ss && offset + len > ss) {
break;
}
offset += len;
} while (element = element.nextSibling);
}
if (!element) {
// It's the container's lastChild
break;
}
} while (element && element.hasChildNodes() && element.nodeType != 3);
if (element) {
return {
element: element,
offset: ss - offset
};
} else if (container) {
element = container;
while (element && element.lastChild) {
element = element.lastChild;
}
if (element.nodeType === 3) {
return {
element: element,
offset: element.textContent.length
};
} else {
return {
element: element,
offset: 0
};
}
}
return {
element: editor.contentElt,
offset: 0,
error: true
};
}
function getCoordinates(inputOffset, element, offset) {
var x = 0;
var y = 0;
if(element.textContent == '\n') {
y = element.parentNode.offsetTop + element.parentNode.offsetHeight / 2;
}
else {
var selectedChar = inputElt.textContent[inputOffset];
var selectionRange;
if(selectedChar === undefined || selectedChar == '\n') {
selectionRange = inputElt.createRange(inputOffset - 1, {
element: element,
offset: offset
});
}
else {
selectionRange = inputElt.createRange({
element: element,
offset: offset
}, inputOffset + 1);
}
var selectionRect = selectionRange.getBoundingClientRect();
y = selectionRect.top + selectionRect.height / 2 - inputElt.offsetTop + inputElt.scrollTop;
selectionRange.detach();
}
return {
x: x,
y: y
};
}
var cursorY = 0;
var isBackwardSelection = false;
function updateCursorCoordinates() {
saveSelectionState();
$inputElt.toggleClass('has-selection', selectionStart !== selectionEnd);
var element;
var offset;
var inputOffset;
if(inputElt.focused) {
isBackwardSelection = false;
var selection = window.getSelection();
if(!selection.rangeCount) {
return;
}
if (!selection.isCollapsed) {
var range = document.createRange();
range.setStart(selection.anchorNode, selection.anchorOffset);
range.setEnd(selection.focusNode, selection.focusOffset);
isBackwardSelection = range.collapsed;
range.detach();
}
var selectionRange = selection.getRangeAt(0);
element = isBackwardSelection ? selectionRange.startContainer : selectionRange.endContainer;
offset = isBackwardSelection ? selectionRange.startOffset : selectionRange.endOffset;
inputOffset = isBackwardSelection ? selectionStart : selectionEnd;
}
else {
inputOffset = isBackwardSelection ? selectionStart : selectionEnd;
var elementOffset = findOffset(inputOffset);
element = elementOffset.element;
offset = elementOffset.offset;
}
var coordinates = getCoordinates(inputOffset, element, offset);
cursorY = coordinates.y;
eventMgr.onCursorCoordinates(coordinates.x, coordinates.y);
}
var adjustCursorPosition = _.debounce(function() {
if(inputElt === undefined) {
return;
}
updateCursorCoordinates();
var adjust = inputElt.offsetHeight / 2;
if(adjust > 130) {
adjust = 130;
}
var cursorMinY = inputElt.scrollTop + adjust;
var cursorMaxY = inputElt.scrollTop + inputElt.offsetHeight - adjust;
if(cursorY < cursorMinY) {
inputElt.scrollTop += cursorY - cursorMinY;
}
else if(cursorY > cursorMaxY) {
inputElt.scrollTop += cursorY - cursorMaxY;
}
}, 0);
eventMgr.addListener('onLayoutResize', adjustCursorPosition);
editor.init = function(elt1, elt2) {
inputElt = elt1;
$inputElt = $(inputElt);
previewElt = elt2;
editor.contentElt = crel('div', {
class: 'editor-content',
contenteditable: true
});
inputElt.appendChild(editor.contentElt);
editor.$contentElt = $(editor.contentElt);
editor.marginElt = crel('div', {
class: 'editor-margin'
});
inputElt.appendChild(editor.marginElt);
editor.$marginElt = $(editor.marginElt);
contentObserver = new MutationObserver(checkContentChange);
contentObserver.observe(editor.contentElt, {
childList: true,
subtree: true,
characterData: true
});
$(inputElt).scroll(function() {
scrollTop = inputElt.scrollTop;
if(fileChanged === false) {
fileDesc.editorScrollTop = scrollTop;
}
});
$(previewElt).scroll(function() {
if(fileChanged === false) {
fileDesc.previewScrollTop = previewElt.scrollTop;
}
});
inputElt.focus = function() {
editor.$contentElt.focus();
this.setSelectionStartEnd(selectionStart, selectionEnd);
inputElt.scrollTop = scrollTop;
};
editor.$contentElt.focus(function() {
inputElt.focused = true;
});
editor.$contentElt.blur(function() {
inputElt.focused = false;
});
Object.defineProperty(inputElt, 'value', {
get: function () {
return this.textContent;
},
set: function (value) {
var startOffset = diffMatchPatch.diff_commonPrefix(previousTextContent, value);
var endOffset = Math.min(
diffMatchPatch.diff_commonSuffix(previousTextContent, value),
previousTextContent.length - startOffset,
value.length - startOffset
);
var replacement = value.substring(startOffset, value.length - endOffset);
var range = inputElt.createRange(startOffset, previousTextContent.length - endOffset);
range.deleteContents();
range.insertNode(document.createTextNode(replacement));
}
});
Object.defineProperty(inputElt, 'selectionStart', {
get: function () {
return selectionStart;
},
set: function (value) {
inputElt.setSelectionStartEnd(value, selectionEnd);
},
enumerable: true,
configurable: true
});
Object.defineProperty(inputElt, 'selectionEnd', {
get: function () {
return selectionEnd;
},
set: function (value) {
inputElt.setSelectionStartEnd(selectionStart, value);
},
enumerable: true,
configurable: true
});
inputElt.setSelectionStartEnd = function (start, end) {
selectionStart = start;
selectionEnd = end;
fileDesc.editorStart = selectionStart;
fileDesc.editorEnd = selectionEnd;
var range = inputElt.createRange(start, end);
var selection = window.getSelection();
selection.removeAllRanges();
selection.addRange(range);
};
inputElt.createRange = function(start, end) {
var range = document.createRange();
var offset = _.isObject(start) ? start : findOffset(start);
range.setStart(offset.element, offset.offset);
if (end && end != start) {
offset = _.isObject(end) ? end : findOffset(end);
}
range.setEnd(offset.element, offset.offset);
return range;
};
inputElt.getOffsetCoordinates = function(ss) {
var offset = findOffset(ss);
return getCoordinates(ss, offset.element, offset.offset);
};
var clearNewline = false;
editor.$contentElt.on('keydown', function (evt) {
if(
evt.which === 17 || // Ctrl
evt.which === 91 || // Cmd
evt.which === 18 || // Alt
evt.which === 16 // Shift
) {
return;
}
saveSelectionState();
adjustCursorPosition();
var cmdOrCtrl = evt.metaKey || evt.ctrlKey;
switch (evt.which) {
case 9: // Tab
if (!cmdOrCtrl) {
action('indent', {
inverse: evt.shiftKey
});
evt.preventDefault();
}
break;
case 13:
action('newline');
evt.preventDefault();
break;
}
if(evt.which !== 13) {
clearNewline = false;
}
})
.on('mouseup', function() {
setTimeout(function() {
updateCursorCoordinates();
}, 0);
})
.on('paste', function () {
currentMode = 'paste';
adjustCursorPosition();
})
.on('cut', function () {
currentMode = 'cut';
adjustCursorPosition();
});
var action = function (action, options) {
options = options || {};
var text = inputElt.value,
ss = options.start || selectionStart,
se = options.end || selectionEnd,
state = {
ss: ss,
se: se,
before: text.slice(0, ss),
after: text.slice(se),
selection: text.slice(ss, se)
};
actions[action](state, options);
inputElt.value = state.before + state.selection + state.after;
inputElt.setSelectionStartEnd(state.ss, state.se);
$inputElt.trigger('input');
};
var actions = {
indent: function (state, options) {
var lf = state.before.lastIndexOf('\n') + 1;
if (options.inverse) {
if (/\s/.test(state.before.charAt(lf))) {
state.before = strSplice(state.before, lf, 1);
state.ss--;
state.se--;
}
state.selection = state.selection.replace(/^[ \t]/gm, '');
} else if (state.selection) {
state.before = strSplice(state.before, lf, 0, '\t');
state.selection = state.selection.replace(/\r?\n(?=[\s\S])/g, '\n\t');
state.ss++;
state.se++;
} else {
state.before += '\t';
state.ss++;
state.se++;
return;
}
state.se = state.ss + state.selection.length;
},
newline: function (state) {
var lf = state.before.lastIndexOf('\n') + 1;
if(clearNewline) {
state.before = state.before.substring(0, lf);
state.selection = '';
state.ss = lf;
state.se = lf;
clearNewline = false;
return;
}
clearNewline = false;
var previousLine = state.before.slice(lf);
var indentMatch = previousLine.match(/^ {0,3}>[ ]*|^[ \t]*(?:[*+\-]|(\d+)\.)[ \t]|^\s+/);
var indent = (indentMatch || [''])[0];
if(indentMatch && indentMatch[1]) {
var number = parseInt(indentMatch[1], 10);
indent = indent.replace(/\d+/, number + 1);
}
if(indent.length) {
clearNewline = true;
}
currentMode = 'newlines';
state.before += '\n' + indent;
state.selection = '';
state.ss += indent.length + 1;
state.se = state.ss;
},
};
};
var sectionList = [];
var sectionsToRemove = [];
var modifiedSections = [];
var insertBeforeSection;
function updateSectionList(newSectionList) {
modifiedSections = [];
sectionsToRemove = [];
insertBeforeSection = undefined;
// Render everything if file changed
if(fileChanged === true) {
sectionsToRemove = sectionList;
sectionList = newSectionList;
modifiedSections = newSectionList;
return;
}
// Find modified section starting from top
var leftIndex = sectionList.length;
_.some(sectionList, function(section, index) {
var newSection = newSectionList[index];
if(index >= newSectionList.length ||
// Check modified
section.textWithFrontMatter != newSection.textWithFrontMatter ||
// Check that section has not been detached or moved
section.elt.parentNode !== editor.contentElt ||
// Check also the content since nodes can be injected in sections via copy/paste
section.elt.textContent != newSection.textWithFrontMatter) {
leftIndex = index;
return true;
}
});
// Find modified section starting from bottom
var rightIndex = -sectionList.length;
_.some(sectionList.slice().reverse(), function(section, index) {
var newSection = newSectionList[newSectionList.length - index - 1];
if(index >= newSectionList.length ||
// Check modified
section.textWithFrontMatter != newSection.textWithFrontMatter ||
// Check that section has not been detached or moved
section.elt.parentNode !== editor.contentElt ||
// Check also the content since nodes can be injected in sections via copy/paste
section.elt.textContent != newSection.textWithFrontMatter) {
rightIndex = -index;
return true;
}
});
if(leftIndex - rightIndex > sectionList.length) {
// Prevent overlap
rightIndex = leftIndex - sectionList.length;
}
// Create an array composed of left unmodified, modified, right
// unmodified sections
var leftSections = sectionList.slice(0, leftIndex);
modifiedSections = newSectionList.slice(leftIndex, newSectionList.length + rightIndex);
var rightSections = sectionList.slice(sectionList.length + rightIndex, sectionList.length);
insertBeforeSection = _.first(rightSections);
sectionsToRemove = sectionList.slice(leftIndex, sectionList.length + rightIndex);
sectionList = leftSections.concat(modifiedSections).concat(rightSections);
}
function highlightSections() {
var newSectionEltList = document.createDocumentFragment();
modifiedSections.forEach(function(section) {
highlight(section);
newSectionEltList.appendChild(section.elt);
});
noWatch(function() {
if(fileChanged === true) {
editor.contentElt.innerHTML = '';
editor.contentElt.appendChild(newSectionEltList);
inputElt.setSelectionStartEnd(selectionStart, selectionEnd);
}
else {
// Remove outdated sections
sectionsToRemove.forEach(function(section) {
// section can be already removed
section.elt.parentNode === editor.contentElt && editor.contentElt.removeChild(section.elt);
});
if(insertBeforeSection !== undefined) {
editor.contentElt.insertBefore(newSectionEltList, insertBeforeSection.elt);
}
else {
editor.contentElt.appendChild(newSectionEltList);
}
// Remove unauthorized nodes (text nodes outside of sections or duplicated sections via copy/paste)
var childNode = editor.contentElt.firstChild;
while(childNode) {
var nextNode = childNode.nextSibling;
if(!childNode.generated) {
editor.contentElt.removeChild(childNode);
}
childNode = nextNode;
}
inputElt.setSelectionStartEnd(selectionStart, selectionEnd);
}
});
}
function highlight(section) {
var text = section.text.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/\u00a0/g, ' ');
text = Prism.highlight(text, Prism.languages.md);
var frontMatter = section.textWithFrontMatter.substring(0, section.textWithFrontMatter.length - section.text.length);
if(frontMatter.length) {
// Front matter highlighting
frontMatter = frontMatter.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/\u00a0/g, ' ');
frontMatter = frontMatter.replace(/\n/g, '<span class="token lf">\n</span>');
text = '<span class="token md">' + frontMatter + '</span>' + text;
}
var sectionElt = crel('span', {
id: 'wmd-input-section-' + section.id,
class: 'wmd-input-section'
});
sectionElt.generated = true;
sectionElt.innerHTML = text;
section.elt = sectionElt;
}
return editor;
});