Orbit/app/assets/javascripts/codemirror/addon/merge/merge.js

432 lines
16 KiB
JavaScript

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// Change handler will do a refresh after a timeout when diff is out of date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