432 lines
16 KiB
JavaScript
432 lines
16 KiB
JavaScript
(function() {
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"use strict";
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var Pos = CodeMirror.Pos;
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var svgNS = "http://www.w3.org/2000/svg";
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function DiffView(mv, type) {
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this.mv = mv;
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this.type = type;
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this.classes = type == "left"
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? {chunk: "CodeMirror-diff-l-chunk",
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start: "CodeMirror-diff-l-chunk-start",
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end: "CodeMirror-diff-l-chunk-end",
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insert: "CodeMirror-diff-l-inserted",
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del: "CodeMirror-diff-l-deleted",
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connect: "CodeMirror-diff-l-connect"}
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: {chunk: "CodeMirror-diff-r-chunk",
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start: "CodeMirror-diff-r-chunk-start",
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end: "CodeMirror-diff-r-chunk-end",
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insert: "CodeMirror-diff-r-inserted",
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del: "CodeMirror-diff-r-deleted",
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connect: "CodeMirror-diff-r-connect"};
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}
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DiffView.prototype = {
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constructor: DiffView,
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init: function(pane, orig, options) {
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this.edit = this.mv.edit;
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this.orig = CodeMirror(pane, copyObj({value: orig, readOnly: true}, copyObj(options)));
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this.diff = getDiff(orig, options.value);
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this.diffOutOfDate = false;
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this.forceUpdate = registerUpdate(this);
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setScrollLock(this, true, false);
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registerScroll(this);
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}
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};
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function registerUpdate(dv) {
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var edit = {from: 0, to: 0, marked: []};
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var orig = {from: 0, to: 0, marked: []};
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var debounceChange;
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function update() {
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if (dv.diffOutOfDate) {
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dv.diff = getDiff(dv.orig.getValue(), dv.edit.getValue());
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dv.diffOutOfDate = false;
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}
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updateMarks(dv.edit, dv.diff, edit, DIFF_INSERT, dv.classes);
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updateMarks(dv.orig, dv.diff, orig, DIFF_DELETE, dv.classes);
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drawConnectors(dv);
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}
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function set(slow) {
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clearTimeout(debounceChange);
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debounceChange = setTimeout(update, slow == true ? 250 : 100);
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}
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dv.edit.on("change", function() {
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if (!dv.diffOutOfDate) {
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dv.diffOutOfDate = true;
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edit.from = edit.to = orig.from = orig.to = 0;
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}
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set(true);
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});
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dv.edit.on("viewportChange", set);
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dv.orig.on("viewportChange", set);
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update();
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return update;
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}
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function registerScroll(dv) {
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dv.edit.on("scroll", function() {
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syncScroll(dv, DIFF_INSERT) && drawConnectors(dv);
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});
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dv.orig.on("scroll", function() {
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syncScroll(dv, DIFF_DELETE) && drawConnectors(dv);
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});
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}
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function syncScroll(dv, type) {
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// Change handler will do a refresh after a timeout when diff is out of date
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if (dv.diffOutOfDate) return false;
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if (!dv.lockScroll) return true;
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var editor, other, now = +new Date;
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if (type == DIFF_INSERT) { editor = dv.edit; other = dv.orig; }
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else { editor = dv.orig; other = dv.edit; }
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// Don't take action if the position of this editor was recently set
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// (to prevent feedback loops)
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if (editor.state.scrollSetBy == dv && (editor.state.scrollSetAt || 0) + 50 > now) return false;
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var sInfo = editor.getScrollInfo(), halfScreen = .5 * sInfo.clientHeight, midY = sInfo.top + halfScreen;
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var mid = editor.lineAtHeight(midY, "local");
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var around = chunkBoundariesAround(dv.diff, mid, type == DIFF_INSERT);
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var off = getOffsets(editor, type == DIFF_INSERT ? around.edit : around.orig);
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var offOther = getOffsets(other, type == DIFF_INSERT ? around.orig : around.edit);
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var ratio = (midY - off.top) / (off.bot - off.top);
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other.scrollTo(null, (offOther.top - halfScreen) + ratio * (offOther.bot - offOther.top));
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other.state.scrollSetAt = now;
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other.state.scrollSetBy = dv;
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return true;
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}
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function getOffsets(editor, around) {
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var bot = around.after;
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if (bot == null) bot = editor.lastLine() + 1;
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return {top: editor.heightAtLine(around.before || 0, "local"),
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bot: editor.heightAtLine(bot, "local")};
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}
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function setScrollLock(dv, val, action) {
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dv.lockScroll = val;
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if (val && action != false) syncScroll(dv, DIFF_INSERT) && drawConnectors(dv);
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dv.lockButton.innerHTML = val ? "\u21db\u21da" : "\u21db \u21da";
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}
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// Updating the marks for editor content
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function clearMarks(editor, arr, classes) {
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for (var i = 0; i < arr.length; ++i) {
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var mark = arr[i];
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if (mark instanceof CodeMirror.TextMarker) {
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mark.clear();
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} else {
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editor.removeLineClass(mark, "background", classes.chunk);
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editor.removeLineClass(mark, "background", classes.start);
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editor.removeLineClass(mark, "background", classes.end);
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}
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}
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arr.length = 0;
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}
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// FIXME maybe add a margin around viewport to prevent too many updates
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function updateMarks(editor, diff, state, type, classes) {
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var vp = editor.getViewport();
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editor.operation(function() {
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if (state.from == state.to || vp.from - state.to > 20 || state.from - vp.to > 20) {
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clearMarks(editor, state.marked, classes);
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markChanges(editor, diff, type, state.marked, vp.from, vp.to, classes);
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state.from = vp.from; state.to = vp.to;
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} else {
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if (vp.from < state.from) {
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markChanges(editor, diff, type, state.marked, vp.from, state.from, classes);
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state.from = vp.from;
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}
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if (vp.to > state.to) {
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markChanges(editor, diff, type, state.marked, state.to, vp.to, classes);
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state.to = vp.to;
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}
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}
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});
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}
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function markChanges(editor, diff, type, marks, from, to, classes) {
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var pos = Pos(0, 0);
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var top = Pos(from, 0), bot = editor.clipPos(Pos(to - 1));
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var cls = type == DIFF_DELETE ? classes.del : classes.insert;
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function markChunk(start, end) {
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var bfrom = Math.max(from, start), bto = Math.min(to, end);
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for (var i = bfrom; i < bto; ++i) {
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var line = editor.addLineClass(i, "background", classes.chunk);
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if (i == start) editor.addLineClass(line, "background", classes.start);
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if (i == end - 1) editor.addLineClass(line, "background", classes.end);
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marks.push(line);
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}
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// When the chunk is empty, make sure a horizontal line shows up
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if (start == end && bfrom == end && bto == end) {
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if (bfrom)
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marks.push(editor.addLineClass(bfrom - 1, "background", classes.end));
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else
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marks.push(editor.addLineClass(bfrom, "background", classes.start));
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}
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}
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var chunkStart = 0;
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for (var i = 0; i < diff.length; ++i) {
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var part = diff[i], tp = part[0], str = part[1];
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if (tp == DIFF_EQUAL) {
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var cleanFrom = pos.line + (startOfLineClean(diff, i) ? 0 : 1);
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moveOver(pos, str);
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var cleanTo = pos.line + (endOfLineClean(diff, i) ? 1 : 0);
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if (cleanTo > cleanFrom) {
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if (i) markChunk(chunkStart, cleanFrom);
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chunkStart = cleanTo;
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}
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} else {
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if (tp == type) {
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var end = moveOver(pos, str, true);
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var a = posMax(top, pos), b = posMin(bot, end);
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if (!posEq(a, b))
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marks.push(editor.markText(a, b, {className: cls}));
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pos = end;
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}
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}
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}
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if (chunkStart <= pos.line) markChunk(chunkStart, pos.line + 1);
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}
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// Updating the gap between editor and original
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function drawConnectors(dv) {
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if (dv.svg) {
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clear(dv.svg);
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var w = dv.gap.offsetWidth;
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attrs(dv.svg, "width", w, "height", dv.gap.offsetHeight);
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}
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clear(dv.copyButtons);
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var flip = dv.type == "left";
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var vpEdit = dv.edit.getViewport(), vpOrig = dv.orig.getViewport();
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var sTopEdit = dv.edit.getScrollInfo().top, sTopOrig = dv.orig.getScrollInfo().top;
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iterateChunks(dv.diff, function(topOrig, botOrig, topEdit, botEdit) {
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if (topEdit >= vpEdit.to || botEdit < vpEdit.from ||
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topOrig >= vpOrig.to || botOrig < vpOrig.from)
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return;
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var topLpx = dv.orig.heightAtLine(topOrig, "local") - sTopOrig, top = topLpx;
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if (dv.svg) {
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var topRpx = dv.edit.heightAtLine(topEdit, "local") - sTopEdit;
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if (flip) { var tmp = topLpx; topLpx = topRpx; topRpx = tmp; }
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var botLpx = dv.orig.heightAtLine(botOrig, "local") - sTopOrig;
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var botRpx = dv.edit.heightAtLine(botEdit, "local") - sTopEdit;
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if (flip) { var tmp = botLpx; botLpx = botRpx; botRpx = tmp; }
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var curveTop = " C " + w/2 + " " + topRpx + " " + w/2 + " " + topLpx + " " + (w + 2) + " " + topLpx;
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var curveBot = " C " + w/2 + " " + botLpx + " " + w/2 + " " + botRpx + " -1 " + botRpx;
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attrs(dv.svg.appendChild(document.createElementNS(svgNS, "path")),
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"d", "M -1 " + topRpx + curveTop + " L " + (w + 2) + " " + botLpx + curveBot + " z",
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"class", dv.classes.connect);
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}
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var copy = dv.copyButtons.appendChild(elt("div", dv.type == "left" ? "\u21dd" : "\u21dc",
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"CodeMirror-diff-copy"));
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copy.title = "Revert chunk";
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copy.chunk = {topEdit: topEdit, botEdit: botEdit, topOrig: topOrig, botOrig: botOrig};
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copy.style.top = top + "px";
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});
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}
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function copyChunk(dv, chunk) {
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if (dv.diffOutOfDate) return;
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dv.edit.replaceRange(dv.orig.getRange(Pos(chunk.topOrig, 0), Pos(chunk.botOrig, 0)),
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Pos(chunk.topEdit, 0), Pos(chunk.botEdit, 0));
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}
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// Merge view, containing 0, 1, or 2 diff views.
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var MergeView = CodeMirror.MergeView = function(node, options) {
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if (!(this instanceof MergeView)) return new MergeView(node, options);
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var origLeft = options.origLeft, origRight = options.origRight == null ? options.orig : options.origRight;
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var hasLeft = origLeft != null, hasRight = origRight != null;
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var panes = 1 + (hasLeft ? 1 : 0) + (hasRight ? 1 : 0);
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var wrap = [], left = this.left = null, right = this.right = null;
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if (hasLeft) {
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left = this.left = new DiffView(this, "left");
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var leftPane = elt("div", null, "CodeMirror-diff-pane");
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wrap.push(leftPane);
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wrap.push(buildGap(left));
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}
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var editPane = elt("div", null, "CodeMirror-diff-pane");
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wrap.push(editPane);
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if (hasRight) {
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right = this.right = new DiffView(this, "right");
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wrap.push(buildGap(right));
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var rightPane = elt("div", null, "CodeMirror-diff-pane");
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wrap.push(rightPane);
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}
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wrap.push(elt("div", null, null, "height: 0; clear: both;"));
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var wrapElt = this.wrap = node.appendChild(elt("div", wrap, "CodeMirror-diff CodeMirror-diff-" + panes + "pane"));
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this.edit = CodeMirror(editPane, copyObj(options));
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if (left) left.init(leftPane, origLeft, options);
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if (right) right.init(rightPane, origRight, options);
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var onResize = function() {
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if (left) drawConnectors(left);
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if (right) drawConnectors(right);
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};
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CodeMirror.on(window, "resize", onResize);
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var resizeInterval = setInterval(function() {
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for (var p = wrapElt.parentNode; p && p != document.body; p = p.parentNode) {}
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if (!p) { clearInterval(resizeInterval); CodeMirror.off(window, "resize", onResize); }
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}, 5000);
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};
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function buildGap(dv) {
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var lock = dv.lockButton = elt("div", null, "CodeMirror-diff-scrolllock");
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lock.title = "Toggle locked scrolling";
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var lockWrap = elt("div", [lock], "CodeMirror-diff-scrolllock-wrap");
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CodeMirror.on(lock, "click", function() { setScrollLock(dv, !dv.lockScroll); });
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dv.copyButtons = elt("div", null, "CodeMirror-diff-copybuttons-" + dv.type);
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CodeMirror.on(dv.copyButtons, "click", function(e) {
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var node = e.target || e.srcElement;
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if (node.chunk) copyChunk(dv, node.chunk);
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});
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var gapElts = [dv.copyButtons, lockWrap];
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var svg = document.createElementNS && document.createElementNS(svgNS, "svg");
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if (svg && !svg.createSVGRect) svg = null;
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dv.svg = svg;
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if (svg) gapElts.push(svg);
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return dv.gap = elt("div", gapElts, "CodeMirror-diff-gap");
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}
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MergeView.prototype = {
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constuctor: MergeView,
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editor: function() { return this.edit; },
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rightOriginal: function() { return this.right && this.right.orig; },
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leftOriginal: function() { return this.left && this.left.orig; }
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};
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// Operations on diffs
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var dmp = new diff_match_patch();
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function getDiff(a, b) {
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var diff = dmp.diff_main(a, b);
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dmp.diff_cleanupSemantic(diff);
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// The library sometimes leaves in empty parts, which confuse the algorithm
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for (var i = 0; i < diff.length; ++i) {
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var part = diff[i];
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if (!part[1]) {
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diff.splice(i--, 1);
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} else if (i && diff[i - 1][0] == part[0]) {
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diff.splice(i--, 1);
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diff[i][1] += part[1];
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}
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}
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return diff;
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}
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function iterateChunks(diff, f) {
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var startEdit = 0, startOrig = 0;
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var edit = Pos(0, 0), orig = Pos(0, 0);
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for (var i = 0; i < diff.length; ++i) {
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var part = diff[i], tp = part[0];
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if (tp == DIFF_EQUAL) {
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var startOff = startOfLineClean(diff, i) ? 0 : 1;
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var cleanFromEdit = edit.line + startOff, cleanFromOrig = orig.line + startOff;
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moveOver(edit, part[1], null, orig);
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var endOff = endOfLineClean(diff, i) ? 1 : 0;
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var cleanToEdit = edit.line + endOff, cleanToOrig = orig.line + endOff;
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if (cleanToEdit > cleanFromEdit) {
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if (i) f(startOrig, cleanFromOrig, startEdit, cleanFromEdit);
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startEdit = cleanToEdit; startOrig = cleanToOrig;
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}
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} else {
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moveOver(tp == DIFF_INSERT ? edit : orig, part[1]);
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}
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}
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if (startEdit <= edit.line || startOrig <= orig.line)
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f(startOrig, orig.line + 1, startEdit, edit.line + 1);
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}
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function endOfLineClean(diff, i) {
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if (i == diff.length - 1) return true;
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var next = diff[i + 1][1];
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if (next.length == 1 || next.charCodeAt(0) != 10) return false;
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if (i == diff.length - 2) return true;
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next = diff[i + 2][1];
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return next.length > 1 && next.charCodeAt(0) == 10;
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}
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function startOfLineClean(diff, i) {
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if (i == 0) return true;
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var last = diff[i - 1][1];
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if (last.charCodeAt(last.length - 1) != 10) return false;
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if (i == 1) return true;
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last = diff[i - 2][1];
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return last.charCodeAt(last.length - 1) == 10;
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}
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function chunkBoundariesAround(diff, n, nInEdit) {
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var beforeE, afterE, beforeO, afterO;
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iterateChunks(diff, function(fromOrig, toOrig, fromEdit, toEdit) {
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var fromLocal = nInEdit ? fromEdit : fromOrig;
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var toLocal = nInEdit ? toEdit : toOrig;
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if (afterE == null) {
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if (fromLocal > n) { afterE = fromEdit; afterO = fromOrig; }
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else if (toLocal > n) { afterE = toEdit; afterO = toOrig; }
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}
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if (toLocal <= n) { beforeE = toEdit; beforeO = toOrig; }
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else if (fromLocal <= n) { beforeE = fromEdit; beforeO = fromOrig; }
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});
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return {edit: {before: beforeE, after: afterE}, orig: {before: beforeO, after: afterO}};
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}
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// General utilities
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function elt(tag, content, className, style) {
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var e = document.createElement(tag);
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if (className) e.className = className;
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if (style) e.style.cssText = style;
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if (typeof content == "string") e.appendChild(document.createTextNode(content));
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else if (content) for (var i = 0; i < content.length; ++i) e.appendChild(content[i]);
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return e;
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}
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function clear(node) {
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for (var count = node.childNodes.length; count > 0; --count)
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node.removeChild(node.firstChild);
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}
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function attrs(elt) {
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for (var i = 1; i < arguments.length; i += 2)
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elt.setAttribute(arguments[i], arguments[i+1]);
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}
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function copyObj(obj, target) {
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if (!target) target = {};
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for (var prop in obj) if (obj.hasOwnProperty(prop)) target[prop] = obj[prop];
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return target;
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}
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function moveOver(pos, str, copy, other) {
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var out = copy ? Pos(pos.line, pos.ch) : pos, at = 0;
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for (;;) {
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var nl = str.indexOf("\n", at);
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if (nl == -1) break;
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++out.line;
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if (other) ++other.line;
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at = nl + 1;
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}
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out.ch = (at ? 0 : out.ch) + (str.length - at);
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if (other) other.ch = (at ? 0 : other.ch) + (str.length - at);
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return out;
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}
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function posMin(a, b) { return (a.line - b.line || a.ch - b.ch) < 0 ? a : b; }
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function posMax(a, b) { return (a.line - b.line || a.ch - b.ch) > 0 ? a : b; }
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function posEq(a, b) { return a.line == b.line && a.ch == b.ch; }
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})();
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