4 var Pos = CodeMirror.Pos;
5 var svgNS = "http://www.w3.org/2000/svg";
7 function DiffView(mv, type) {
10 this.classes = type == "left"
11 ? {chunk: "CodeMirror-merge-l-chunk",
12 start: "CodeMirror-merge-l-chunk-start",
13 end: "CodeMirror-merge-l-chunk-end",
14 insert: "CodeMirror-merge-l-inserted",
15 del: "CodeMirror-merge-l-deleted",
16 connect: "CodeMirror-merge-l-connect"}
17 : {chunk: "CodeMirror-merge-r-chunk",
18 start: "CodeMirror-merge-r-chunk-start",
19 end: "CodeMirror-merge-r-chunk-end",
20 insert: "CodeMirror-merge-r-inserted",
21 del: "CodeMirror-merge-r-deleted",
22 connect: "CodeMirror-merge-r-connect"};
25 DiffView.prototype = {
26 constructor: DiffView,
27 init: function(pane, orig, options) {
28 this.edit = this.mv.edit;
29 this.orig = CodeMirror(pane, copyObj({value: orig, readOnly: true}, copyObj(options)));
31 this.diff = getDiff(orig, options.value);
32 this.diffOutOfDate = false;
34 this.forceUpdate = registerUpdate(this);
35 setScrollLock(this, true, false);
40 function registerUpdate(dv) {
41 var edit = {from: 0, to: 0, marked: []};
42 var orig = {from: 0, to: 0, marked: []};
45 if (dv.diffOutOfDate) {
46 dv.diff = getDiff(dv.orig.getValue(), dv.edit.getValue());
47 dv.diffOutOfDate = false;
49 updateMarks(dv.edit, dv.diff, edit, DIFF_INSERT, dv.classes);
50 updateMarks(dv.orig, dv.diff, orig, DIFF_DELETE, dv.classes);
54 clearTimeout(debounceChange);
55 debounceChange = setTimeout(update, slow == true ? 250 : 100);
57 dv.edit.on("change", function() {
58 if (!dv.diffOutOfDate) {
59 dv.diffOutOfDate = true;
60 edit.from = edit.to = orig.from = orig.to = 0;
64 dv.edit.on("viewportChange", set);
65 dv.orig.on("viewportChange", set);
70 function registerScroll(dv) {
71 dv.edit.on("scroll", function() {
72 syncScroll(dv, DIFF_INSERT) && drawConnectors(dv);
74 dv.orig.on("scroll", function() {
75 syncScroll(dv, DIFF_DELETE) && drawConnectors(dv);
79 function syncScroll(dv, type) {
80 // Change handler will do a refresh after a timeout when diff is out of date
81 if (dv.diffOutOfDate) return false;
82 if (!dv.lockScroll) return true;
83 var editor, other, now = +new Date;
84 if (type == DIFF_INSERT) { editor = dv.edit; other = dv.orig; }
85 else { editor = dv.orig; other = dv.edit; }
86 // Don't take action if the position of this editor was recently set
87 // (to prevent feedback loops)
88 if (editor.state.scrollSetBy == dv && (editor.state.scrollSetAt || 0) + 50 > now) return false;
90 var sInfo = editor.getScrollInfo(), halfScreen = .5 * sInfo.clientHeight, midY = sInfo.top + halfScreen;
91 var mid = editor.lineAtHeight(midY, "local");
92 var around = chunkBoundariesAround(dv.diff, mid, type == DIFF_INSERT);
93 var off = getOffsets(editor, type == DIFF_INSERT ? around.edit : around.orig);
94 var offOther = getOffsets(other, type == DIFF_INSERT ? around.orig : around.edit);
95 var ratio = (midY - off.top) / (off.bot - off.top);
96 var targetPos = (offOther.top - halfScreen) + ratio * (offOther.bot - offOther.top);
99 // Some careful tweaking to make sure no space is left out of view
100 // when scrolling to top or bottom.
101 if (targetPos > sInfo.top && (mix = sInfo.top / halfScreen) < 1) {
102 targetPos = targetPos * mix + sInfo.top * (1 - mix);
103 } else if ((botDist = sInfo.height - sInfo.clientHeight - sInfo.top) < halfScreen) {
104 var otherInfo = other.getScrollInfo();
105 var botDistOther = otherInfo.height - otherInfo.clientHeight - targetPos;
106 if (botDistOther > botDist && (mix = botDist / halfScreen) < 1)
107 targetPos = targetPos * mix + (otherInfo.height - otherInfo.clientHeight - botDist) * (1 - mix);
110 other.scrollTo(sInfo.left, targetPos);
111 other.state.scrollSetAt = now;
112 other.state.scrollSetBy = dv;
116 function getOffsets(editor, around) {
117 var bot = around.after;
118 if (bot == null) bot = editor.lastLine() + 1;
119 return {top: editor.heightAtLine(around.before || 0, "local"),
120 bot: editor.heightAtLine(bot, "local")};
123 function setScrollLock(dv, val, action) {
125 if (val && action != false) syncScroll(dv, DIFF_INSERT) && drawConnectors(dv);
126 dv.lockButton.innerHTML = val ? "\u21db\u21da" : "\u21db \u21da";
129 // Updating the marks for editor content
131 function clearMarks(editor, arr, classes) {
132 for (var i = 0; i < arr.length; ++i) {
134 if (mark instanceof CodeMirror.TextMarker) {
137 editor.removeLineClass(mark, "background", classes.chunk);
138 editor.removeLineClass(mark, "background", classes.start);
139 editor.removeLineClass(mark, "background", classes.end);
145 // FIXME maybe add a margin around viewport to prevent too many updates
146 function updateMarks(editor, diff, state, type, classes) {
147 var vp = editor.getViewport();
148 editor.operation(function() {
149 if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
150 clearMarks(editor, state.marked, classes);
151 markChanges(editor, diff, type, state.marked, vp.from, vp.to, classes);
152 state.from = vp.from; state.to = vp.to;
154 if (vp.from < state.from) {
155 markChanges(editor, diff, type, state.marked, vp.from, state.from, classes);
156 state.from = vp.from;
158 if (vp.to > state.to) {
159 markChanges(editor, diff, type, state.marked, state.to, vp.to, classes);
166 function markChanges(editor, diff, type, marks, from, to, classes) {
168 var top = Pos(from, 0), bot = editor.clipPos(Pos(to - 1));
169 var cls = type == DIFF_DELETE ? classes.del : classes.insert;
170 function markChunk(start, end) {
171 var bfrom = Math.max(from, start), bto = Math.min(to, end);
172 for (var i = bfrom; i < bto; ++i) {
173 var line = editor.addLineClass(i, "background", classes.chunk);
174 if (i == start) editor.addLineClass(line, "background", classes.start);
175 if (i == end - 1) editor.addLineClass(line, "background", classes.end);
178 // When the chunk is empty, make sure a horizontal line shows up
179 if (start == end && bfrom == end && bto == end) {
181 marks.push(editor.addLineClass(bfrom - 1, "background", classes.end));
183 marks.push(editor.addLineClass(bfrom, "background", classes.start));
188 for (var i = 0; i < diff.length; ++i) {
189 var part = diff[i], tp = part[0], str = part[1];
190 if (tp == DIFF_EQUAL) {
191 var cleanFrom = pos.line + (startOfLineClean(diff, i) ? 0 : 1);
193 var cleanTo = pos.line + (endOfLineClean(diff, i) ? 1 : 0);
194 if (cleanTo > cleanFrom) {
195 if (i) markChunk(chunkStart, cleanFrom);
196 chunkStart = cleanTo;
200 var end = moveOver(pos, str, true);
201 var a = posMax(top, pos), b = posMin(bot, end);
203 marks.push(editor.markText(a, b, {className: cls}));
208 if (chunkStart <= pos.line) markChunk(chunkStart, pos.line + 1);
211 // Updating the gap between editor and original
213 function drawConnectors(dv) {
216 var w = dv.gap.offsetWidth;
217 attrs(dv.svg, "width", w, "height", dv.gap.offsetHeight);
219 clear(dv.copyButtons);
221 var flip = dv.type == "left";
222 var vpEdit = dv.edit.getViewport(), vpOrig = dv.orig.getViewport();
223 var sTopEdit = dv.edit.getScrollInfo().top, sTopOrig = dv.orig.getScrollInfo().top;
224 iterateChunks(dv.diff, function(topOrig, botOrig, topEdit, botEdit) {
225 if (topEdit > vpEdit.to || botEdit < vpEdit.from ||
226 topOrig > vpOrig.to || botOrig < vpOrig.from)
228 var topLpx = dv.orig.heightAtLine(topOrig, "local") - sTopOrig, top = topLpx;
230 var topRpx = dv.edit.heightAtLine(topEdit, "local") - sTopEdit;
231 if (flip) { var tmp = topLpx; topLpx = topRpx; topRpx = tmp; }
232 var botLpx = dv.orig.heightAtLine(botOrig, "local") - sTopOrig;
233 var botRpx = dv.edit.heightAtLine(botEdit, "local") - sTopEdit;
234 if (flip) { var tmp = botLpx; botLpx = botRpx; botRpx = tmp; }
235 var curveTop = " C " + w/2 + " " + topRpx + " " + w/2 + " " + topLpx + " " + (w + 2) + " " + topLpx;
236 var curveBot = " C " + w/2 + " " + botLpx + " " + w/2 + " " + botRpx + " -1 " + botRpx;
237 attrs(dv.svg.appendChild(document.createElementNS(svgNS, "path")),
238 "d", "M -1 " + topRpx + curveTop + " L " + (w + 2) + " " + botLpx + curveBot + " z",
239 "class", dv.classes.connect);
241 var copy = dv.copyButtons.appendChild(elt("div", dv.type == "left" ? "\u21dd" : "\u21dc",
242 "CodeMirror-merge-copy"));
243 copy.title = "Revert chunk";
244 copy.chunk = {topEdit: topEdit, botEdit: botEdit, topOrig: topOrig, botOrig: botOrig};
245 copy.style.top = top + "px";
249 function copyChunk(dv, chunk) {
250 if (dv.diffOutOfDate) return;
251 dv.edit.replaceRange(dv.orig.getRange(Pos(chunk.topOrig, 0), Pos(chunk.botOrig, 0)),
252 Pos(chunk.topEdit, 0), Pos(chunk.botEdit, 0));
255 // Merge view, containing 0, 1, or 2 diff views.
257 var MergeView = CodeMirror.MergeView = function(node, options) {
258 if (!(this instanceof MergeView)) return new MergeView(node, options);
260 var origLeft = options.origLeft, origRight = options.origRight == null ? options.orig : options.origRight;
261 var hasLeft = origLeft != null, hasRight = origRight != null;
262 var panes = 1 + (hasLeft ? 1 : 0) + (hasRight ? 1 : 0);
263 var wrap = [], left = this.left = null, right = this.right = null;
266 left = this.left = new DiffView(this, "left");
267 var leftPane = elt("div", null, "CodeMirror-merge-pane");
269 wrap.push(buildGap(left));
272 var editPane = elt("div", null, "CodeMirror-merge-pane");
276 right = this.right = new DiffView(this, "right");
277 wrap.push(buildGap(right));
278 var rightPane = elt("div", null, "CodeMirror-merge-pane");
279 wrap.push(rightPane);
282 (hasRight ? rightPane : editPane).className += " CodeMirror-merge-pane-rightmost";
284 wrap.push(elt("div", null, null, "height: 0; clear: both;"));
285 var wrapElt = this.wrap = node.appendChild(elt("div", wrap, "CodeMirror-merge CodeMirror-merge-" + panes + "pane"));
286 this.edit = CodeMirror(editPane, copyObj(options));
288 if (left) left.init(leftPane, origLeft, options);
289 if (right) right.init(rightPane, origRight, options);
291 var onResize = function() {
292 if (left) drawConnectors(left);
293 if (right) drawConnectors(right);
295 CodeMirror.on(window, "resize", onResize);
296 var resizeInterval = setInterval(function() {
297 for (var p = wrapElt.parentNode; p && p != document.body; p = p.parentNode) {}
298 if (!p) { clearInterval(resizeInterval); CodeMirror.off(window, "resize", onResize); }
302 function buildGap(dv) {
303 var lock = dv.lockButton = elt("div", null, "CodeMirror-merge-scrolllock");
304 lock.title = "Toggle locked scrolling";
305 var lockWrap = elt("div", [lock], "CodeMirror-merge-scrolllock-wrap");
306 CodeMirror.on(lock, "click", function() { setScrollLock(dv, !dv.lockScroll); });
307 dv.copyButtons = elt("div", null, "CodeMirror-merge-copybuttons-" + dv.type);
308 CodeMirror.on(dv.copyButtons, "click", function(e) {
309 var node = e.target || e.srcElement;
310 if (node.chunk) copyChunk(dv, node.chunk);
312 var gapElts = [dv.copyButtons, lockWrap];
313 var svg = document.createElementNS && document.createElementNS(svgNS, "svg");
314 if (svg && !svg.createSVGRect) svg = null;
316 if (svg) gapElts.push(svg);
318 return dv.gap = elt("div", gapElts, "CodeMirror-merge-gap");
321 MergeView.prototype = {
322 constuctor: MergeView,
323 editor: function() { return this.edit; },
324 rightOriginal: function() { return this.right && this.right.orig; },
325 leftOriginal: function() { return this.left && this.left.orig; }
328 // Operations on diffs
330 var dmp = new diff_match_patch();
331 function getDiff(a, b) {
332 var diff = dmp.diff_main(a, b);
333 dmp.diff_cleanupSemantic(diff);
334 // The library sometimes leaves in empty parts, which confuse the algorithm
335 for (var i = 0; i < diff.length; ++i) {
339 } else if (i && diff[i - 1][0] == part[0]) {
341 diff[i][1] += part[1];
347 function iterateChunks(diff, f) {
348 var startEdit = 0, startOrig = 0;
349 var edit = Pos(0, 0), orig = Pos(0, 0);
350 for (var i = 0; i < diff.length; ++i) {
351 var part = diff[i], tp = part[0];
352 if (tp == DIFF_EQUAL) {
353 var startOff = startOfLineClean(diff, i) ? 0 : 1;
354 var cleanFromEdit = edit.line + startOff, cleanFromOrig = orig.line + startOff;
355 moveOver(edit, part[1], null, orig);
356 var endOff = endOfLineClean(diff, i) ? 1 : 0;
357 var cleanToEdit = edit.line + endOff, cleanToOrig = orig.line + endOff;
358 if (cleanToEdit > cleanFromEdit) {
359 if (i) f(startOrig, cleanFromOrig, startEdit, cleanFromEdit);
360 startEdit = cleanToEdit; startOrig = cleanToOrig;
363 moveOver(tp == DIFF_INSERT ? edit : orig, part[1]);
366 if (startEdit <= edit.line || startOrig <= orig.line)
367 f(startOrig, orig.line + 1, startEdit, edit.line + 1);
370 function endOfLineClean(diff, i) {
371 if (i == diff.length - 1) return true;
372 var next = diff[i + 1][1];
373 if (next.length == 1 || next.charCodeAt(0) != 10) return false;
374 if (i == diff.length - 2) return true;
375 next = diff[i + 2][1];
376 return next.length > 1 && next.charCodeAt(0) == 10;
379 function startOfLineClean(diff, i) {
380 if (i == 0) return true;
381 var last = diff[i - 1][1];
382 if (last.charCodeAt(last.length - 1) != 10) return false;
383 if (i == 1) return true;
384 last = diff[i - 2][1];
385 return last.charCodeAt(last.length - 1) == 10;
388 function chunkBoundariesAround(diff, n, nInEdit) {
389 var beforeE, afterE, beforeO, afterO;
390 iterateChunks(diff, function(fromOrig, toOrig, fromEdit, toEdit) {
391 var fromLocal = nInEdit ? fromEdit : fromOrig;
392 var toLocal = nInEdit ? toEdit : toOrig;
393 if (afterE == null) {
394 if (fromLocal > n) { afterE = fromEdit; afterO = fromOrig; }
395 else if (toLocal > n) { afterE = toEdit; afterO = toOrig; }
397 if (toLocal <= n) { beforeE = toEdit; beforeO = toOrig; }
398 else if (fromLocal <= n) { beforeE = fromEdit; beforeO = fromOrig; }
400 return {edit: {before: beforeE, after: afterE}, orig: {before: beforeO, after: afterO}};
405 function elt(tag, content, className, style) {
406 var e = document.createElement(tag);
407 if (className) e.className = className;
408 if (style) e.style.cssText = style;
409 if (typeof content == "string") e.appendChild(document.createTextNode(content));
410 else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
414 function clear(node) {
415 for (var count = node.childNodes.length; count > 0; --count)
416 node.removeChild(node.firstChild);
419 function attrs(elt) {
420 for (var i = 1; i < arguments.length; i += 2)
421 elt.setAttribute(arguments[i], arguments[i+1]);
424 function copyObj(obj, target) {
425 if (!target) target = {};
426 for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
430 function moveOver(pos, str, copy, other) {
431 var out = copy ? Pos(pos.line, pos.ch) : pos, at = 0;
433 var nl = str.indexOf("\n", at);
436 if (other) ++other.line;
439 out.ch = (at ? 0 : out.ch) + (str.length - at);
440 if (other) other.ch = (at ? 0 : other.ch) + (str.length - at);
444 function posMin(a, b) { return (a.line - b.line || a.ch - b.ch) < 0 ? a : b; }
445 function posMax(a, b) { return (a.line - b.line || a.ch - b.ch) > 0 ? a : b; }
446 function posEq(a, b) { return a.line == b.line && a.ch == b.ch; }