├── .gitignore
├── LICENSE
├── README.md
├── Setup.hs
├── cow.cabal
├── default.nix
├── demos
├── big.html
├── big.ltx
├── bigL.js
├── bigR.js
├── change.sty
├── cow.css
├── cow.js
├── diffL.js
├── diffOut.html
├── diffOut.ltx
├── diffR.js
├── jquery.js
└── old
│ ├── blarg.html
│ ├── blarg.ltx
│ ├── blarg.pdf
│ ├── change.sty
│ ├── cow.css
│ ├── cow.js
│ ├── diffL.js
│ ├── diffR.js
│ ├── illustration.ltx
│ ├── illustration.pdf
│ ├── jquery.js
│ ├── move.html
│ ├── move.ltx
│ ├── move.pdf
│ ├── moveL.js
│ ├── moveOut.html
│ ├── moveOut.ltx
│ ├── moveR.js
│ └── test.js
├── nix
├── haskell.nix
├── nixpkgs.nix
└── pinned.nix
├── rough-logo.png
├── shell.nix
└── src
└── Cow
├── Diff.hs
├── Examples.hs
├── Language
├── JavaScript.hs
├── JavaScript
│ └── Value.hs
└── Token.hs
├── Main.hs
├── ParseTree.hs
└── ParseTree
├── Read.hs
└── Viz.hs
/.gitignore:
--------------------------------------------------------------------------------
1 | # Nix build results
2 | result
3 |
4 | # Emacs backup files:
5 | *~
6 | \#*\#
7 |
8 | # Haskell build artifacts
9 | *.hi
10 | *.o
11 | dist
12 | dist-newstyle
13 |
14 | # IPython (IHaskell) notebook stuff
15 | *.ipynb*
16 |
17 | # Files generated by LaTeX
18 | out.*
19 | _region*
20 | *.aux
21 | *.log
22 | .\#*
23 |
24 |
--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
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536 | Nothing in this License shall be construed as excluding or limiting
537 | any implied license or other defenses to infringement that may
538 | otherwise be available to you under applicable patent law.
539 |
540 | 12. No Surrender of Others' Freedom.
541 |
542 | If conditions are imposed on you (whether by court order, agreement or
543 | otherwise) that contradict the conditions of this License, they do not
544 | excuse you from the conditions of this License. If you cannot convey a
545 | covered work so as to satisfy simultaneously your obligations under this
546 | License and any other pertinent obligations, then as a consequence you may
547 | not convey it at all. For example, if you agree to terms that obligate you
548 | to collect a royalty for further conveying from those to whom you convey
549 | the Program, the only way you could satisfy both those terms and this
550 | License would be to refrain entirely from conveying the Program.
551 |
552 | 13. Use with the GNU Affero General Public License.
553 |
554 | Notwithstanding any other provision of this License, you have
555 | permission to link or combine any covered work with a work licensed
556 | under version 3 of the GNU Affero General Public License into a single
557 | combined work, and to convey the resulting work. The terms of this
558 | License will continue to apply to the part which is the covered work,
559 | but the special requirements of the GNU Affero General Public License,
560 | section 13, concerning interaction through a network will apply to the
561 | combination as such.
562 |
563 | 14. Revised Versions of this License.
564 |
565 | The Free Software Foundation may publish revised and/or new versions of
566 | the GNU General Public License from time to time. Such new versions will
567 | be similar in spirit to the present version, but may differ in detail to
568 | address new problems or concerns.
569 |
570 | Each version is given a distinguishing version number. If the
571 | Program specifies that a certain numbered version of the GNU General
572 | Public License "or any later version" applies to it, you have the
573 | option of following the terms and conditions either of that numbered
574 | version or of any later version published by the Free Software
575 | Foundation. If the Program does not specify a version number of the
576 | GNU General Public License, you may choose any version ever published
577 | by the Free Software Foundation.
578 |
579 | If the Program specifies that a proxy can decide which future
580 | versions of the GNU General Public License can be used, that proxy's
581 | public statement of acceptance of a version permanently authorizes you
582 | to choose that version for the Program.
583 |
584 | Later license versions may give you additional or different
585 | permissions. However, no additional obligations are imposed on any
586 | author or copyright holder as a result of your choosing to follow a
587 | later version.
588 |
589 | 15. Disclaimer of Warranty.
590 |
591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
599 |
600 | 16. Limitation of Liability.
601 |
602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
610 | SUCH DAMAGES.
611 |
612 | 17. Interpretation of Sections 15 and 16.
613 |
614 | If the disclaimer of warranty and limitation of liability provided
615 | above cannot be given local legal effect according to their terms,
616 | reviewing courts shall apply local law that most closely approximates
617 | an absolute waiver of all civil liability in connection with the
618 | Program, unless a warranty or assumption of liability accompanies a
619 | copy of the Program in return for a fee.
620 |
621 | END OF TERMS AND CONDITIONS
622 |
623 | How to Apply These Terms to Your New Programs
624 |
625 | If you develop a new program, and you want it to be of the greatest
626 | possible use to the public, the best way to achieve this is to make it
627 | free software which everyone can redistribute and change under these terms.
628 |
629 | To do so, attach the following notices to the program. It is safest
630 | to attach them to the start of each source file to most effectively
631 | state the exclusion of warranty; and each file should have at least
632 | the "copyright" line and a pointer to where the full notice is found.
633 |
634 |
635 | Copyright (C)
636 |
637 | This program is free software: you can redistribute it and/or modify
638 | it under the terms of the GNU General Public License as published by
639 | the Free Software Foundation, either version 3 of the License, or
640 | (at your option) any later version.
641 |
642 | This program is distributed in the hope that it will be useful,
643 | but WITHOUT ANY WARRANTY; without even the implied warranty of
644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
645 | GNU General Public License for more details.
646 |
647 | You should have received a copy of the GNU General Public License
648 | along with this program. If not, see .
649 |
650 | Also add information on how to contact you by electronic and paper mail.
651 |
652 | If the program does terminal interaction, make it output a short
653 | notice like this when it starts in an interactive mode:
654 |
655 | Copyright (C)
656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
657 | This is free software, and you are welcome to redistribute it
658 | under certain conditions; type `show c' for details.
659 |
660 | The hypothetical commands `show w' and `show c' should show the appropriate
661 | parts of the General Public License. Of course, your program's commands
662 | might be different; for a GUI interface, you would use an "about box".
663 |
664 | You should also get your employer (if you work as a programmer) or school,
665 | if any, to sign a "copyright disclaimer" for the program, if necessary.
666 | For more information on this, and how to apply and follow the GNU GPL, see
667 | .
668 |
669 | The GNU General Public License does not permit incorporating your program
670 | into proprietary programs. If your program is a subroutine library, you
671 | may consider it more useful to permit linking proprietary applications with
672 | the library. If this is what you want to do, use the GNU Lesser General
673 | Public License instead of this License. But first, please read
674 | .
675 |
676 |
--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # Cow: Structural Version Control
2 |
3 | Normal diff and merge tools treat programs as plain text. They are easily confused by superficial changes to the code and can't take advantage of the code's inherent structure for deeper analysis.
4 |
5 | Language specific **semantic version control** tools can provide a high level of analysis but are tied to the syntax and semantics of specific languages. Tools that understand Java class and method declarations¹ can provide an improved diff and merge experience but don't easily generalize. You could extend the approach to languages with substantially similar models (like C♯) but working with more distinct languages would require new logic.
6 |
7 | The approach here takes a middle ground: we take advantage of the *structure* of the text without being tied to its semantics. By operating on **parse trees** with no deeper semantic information, our algorithms can work for any language that we can parse while still giving more insight than a tool constrained to plain text.
8 |
9 | #### footnotes
10 | ¹ Like the [SemanticMerge] system.
11 |
12 | [SemanticMerge]: https://www.semanticmerge.com/
13 |
14 | ## Architecture Overview
15 |
16 | The current approach works as a pipeline of several distinct algorithms. Each step will produce an intermediate form with a clear interface, making it easy to plug additional logic in between any two steps.
17 |
18 | 1. **Parsing**: the only language-specific part of the pipeline is producing parse trees. In this context, a **parse tree** is a slightly lower-level representation than an abstract syntax tree: it's a tree that's only labeled at its leaves, with exactly one leaf node per token. Reading out the leaves left-to-right recreates the input stream of tokens.
19 |
20 | Each language we support will need a custom parser. In practice, it seems hard to reuse existing language parsers because the behavior we need for diffing and merging is different from what compilers and most other tools require:
21 |
22 | * We can make distinctions the compiler wouldn't, like detecting statements grouped with blank lines.
23 | * We want to preserve as much lexical information as possible to recreate the program text—especially for merging.
24 | * Controlling how the code is parsed gives us fine control over the resulting diff, letting us selectively ignore things we don't care about. Think of this is a sophisticated, syntax-aware alternative to ignoring whitespace with normal diff.
25 |
26 | It's definitely worth exploring round-tripping parsers like `ghc-exactprint`, although I suspect there are still advantages to hand-writing parsers specifically for this tool.
27 |
28 | 2. **Parse tree diff**: we find a minimal number of additions and deletions to go between two parse trees. The tree structure is used to consolidate multiple changes into one: if you changed most of the lines in a block of code, it's useful to think of that as a single action rather than a bunch of separate actions per line. The threshold for when to consolidate changes is based on a heuristic which will have to be tuned per-language.
29 |
30 | This diff reflects the structure of the code, so it can reduce the amount of noise that text-based algorithms provide. The main advantage, though, is that this extra structure can be fed into further analysis steps, giving us higher-level information about the code differences.
31 |
32 | The current algorithm for calculating the needed changes is a modification of the [Wagner-Fischer] algorithm for normal string edit distance. It's based on dynamic programming and runs in O(n²) time and space where n is the total number of nodes in the tree (including internal nodes).
33 |
34 | 3. **Substructure detection**: the next step identifies which blocks of code (ie subtrees) correspond between the two trees being compared, with some heuristic for determining when two subtrees are "close enough". This information is used to find blocks of code that were moved and can also be used for additional analysis by a plugin.
35 |
36 | It's useful to think of this as a graph problem where each subtree is a node with edges to each other subtree weighted based on some distance between them (perhaps based on the distances calculated in step 2). Given this graph, there are two possible approaches I'm considering:
37 |
38 | * *bipartite graph matching*: the earlier proof of concept found matching substructures by finding the best match between subtrees from the input and output and keeping all the resulting pairs that were close enough in weight. This approach is solid in common cases where you just move a block of code, but doesn't detect more complex transformations like copying a subtree into *two* places in the new tree.
39 |
40 | * *clustering*: the main alternative I'm considering now is some sort of clustering algorithm that tries to find all the subtrees that are "close enough". This will be able to detect more complex relationships in the code but will likely also depend more on the weights and heuristics used to identify clusters.
41 |
42 | I've currently implemented the bipartite graph matching system, but I'm starting to suspect a more general clustering approach is a better bet.
43 |
44 | 4. **Merging**: the final (optional) step is merging and conflict resolution. One of the neat advantages to how the tree diff was designed for step 2 is that the resulting diff is a parse tree itself with some additional annotations. This allows us to find conflicts by doing a diff-of-diffs.
45 |
46 | Once we have a diff-of-diffs, we should be able to resolve more conflicts than a purely text-based system thanks to the high-level information we derived in the previous steps. For example, we can apply *both* a move *and* a modification to a block even if the changes physically overlap in the text.
47 |
48 | This step is the least-developed in the current system. The basic idea worked well in the old proof-of-concept but I've rethought many of the details of the previous steps without revisting merging. I'll put more thought and work towards merging once I get the previous few steps working satisfactorily.
49 |
50 | [Wagner-Fischer]: https://en.wikipedia.org/wiki/Wagner%E2%80%93Fischer_algorithm
51 |
52 | ## Progress
53 |
54 | This project is at an early proof-of-concept stage. At this point I've figured out the core parse-tree-diff algorithm and implemented the bipartite-matching-based substructure detection step, but have not really tuned this for real use. The only language currently supported is JavaScript, with a pretty rough parser written in Parsec.
55 |
56 | ## History
57 |
58 | Most of the code comes from a few years ago and is purely exploratory in nature. It was the final project for CS164, the programming languages class at Berkeley. I worked on the project with Ankur Dave whose insights helped shaped much of the design.
59 |
60 | I didn't really know what I wanted to accomplish so it's rough and hard to follow. I also never managed to get the diff algorithm working efficiently (partly because it was never well-specified), so never tested anything on non-trivial amounts of code.
61 |
62 | I've started working on the project again recently. Thanks largely to collaboration with Dimitri DeFigueiredo I've come up with a significantly more concrete idea of what I want to accomplish in each part of the system, and I've figured out an efficient way to implement the parse tree diff algorithm based on [Wagner-Fischer].
63 |
--------------------------------------------------------------------------------
/Setup.hs:
--------------------------------------------------------------------------------
1 | import Distribution.Simple
2 | main = defaultMain
3 |
--------------------------------------------------------------------------------
/cow.cabal:
--------------------------------------------------------------------------------
1 | Name: cow
2 | Version: 0.3.0.0
3 | Synopsis: Semantic version control: language-aware diff and merge.
4 | Description: An advanced diff and merge tool that parses code files and then compares the resulting parse trees rather than the actual text of the program.
5 | Homepage: http://jelv.is/cow
6 |
7 | License: GPL-3
8 | License-file: LICENSE
9 |
10 |
11 | Author: Ankur Dave, Tikhon Jelvis
12 | Maintainer: Tikhon Jelvis
13 |
14 | Category: Development
15 |
16 | Build-type: Simple
17 |
18 | Cabal-version: >=1.9.2
19 |
20 | Library
21 | GHC-options: -rtsopts -O2
22 | Hs-source-dirs: src
23 |
24 | Build-depends: array >= 0.3
25 | , base
26 | , containers >= 0.4
27 | , diagrams-contrib >= 1.3
28 | , diagrams-lib >= 1.3
29 | , diagrams-svg >= 1.3
30 | , lens >= 4.13
31 | , mtl >= 2
32 | , parsec >= 3
33 | , text >= 1.2
34 |
35 | Exposed-modules: Cow.Diff
36 | , Cow.Examples
37 | , Cow.Language.JavaScript
38 | , Cow.Language.JavaScript.Value
39 | , Cow.Language.Token
40 | , Cow.ParseTree
41 | , Cow.ParseTree.Read
42 | , Cow.ParseTree.Viz
43 |
44 | Executable cow
45 | Main-is: src/Cow/Main.hs
46 | Build-depends: base
47 | , cow
48 | , diagrams-svg >= 1.3
49 | , lens >= 4.13
50 | , parsec >= 3
51 | , text >= 1.2
52 | GHC-options: -rtsopts -O2
53 |
--------------------------------------------------------------------------------
/default.nix:
--------------------------------------------------------------------------------
1 | { pkgs ? import nix/nixpkgs.nix {}
2 | , compiler ? null
3 | , haskellPackages ? import nix/haskell.nix { compiler = compiler; }
4 | }:
5 | haskellPackages.developPackage {
6 | name = "cow";
7 | root = (pkgs.lib.cleanSourceWith {
8 | src = ./.;
9 | filter = path: type:
10 | let
11 | name = baseNameOf (toString path);
12 | ignored = ["dist" "dist-newstyle"];
13 | in
14 | builtins.all (ignored-file: name != ignored-file) ignored &&
15 | !pkgs.lib.hasPrefix ".ghc.environment" name &&
16 | pkgs.lib.cleanSourceFilter path type;
17 | }).outPath;
18 |
19 | # Disable "smart" Nix-shell detection because it is impure (depends
20 | # on the IN_NIX_SHELL environment variable), which can cause
21 | # hard-to-debug Nix issues.
22 | #
23 | # Instead, we have an explicit shell.nix with extra shell-specific
24 | # settings.
25 | returnShellEnv = false;
26 | }
27 |
--------------------------------------------------------------------------------
/demos/big.html:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/TikhonJelvis/Cow/65832f9826ede4c1380cdc35a42f2b85b1bfebea/demos/big.html
--------------------------------------------------------------------------------
/demos/big.ltx:
--------------------------------------------------------------------------------
1 | \documentclass[12pt]{article}
2 | \usepackage{change}
3 | \usepackage[margin=1in, paperwidth=100in, textwidth=100in, paperheight=10in]{geometry}
4 | \begin{document}
5 | \synttree[\Non{\uppercase{root}}]
6 | \end{document}
7 |
--------------------------------------------------------------------------------
/demos/bigL.js:
--------------------------------------------------------------------------------
1 | function Solitaire() {
2 | var board = new Board({
3 | rootId : "Klondike",
4 | magicalX : 106
5 | });
6 |
7 | var totalDeck = new Deck(board.collapsedType, 0, 0, {
8 | filter : function () { return false; },
9 | draggable : false
10 | });
11 | totalDeck.initialize(true);
12 |
13 | var discard = new Deck(board.collapsedType, 1, 0, {
14 | filter : function(card) { return false; }
15 | });
16 | board.addDeck(discard);
17 |
18 | totalDeck.shuffle();
19 | totalDeck.setAction(function () {
20 | var top = totalDeck.peek();
21 |
22 | if (!top) {
23 | discard.deal(totalDeck, discard.getCards().length, true);
24 | } else {
25 | top.setFaceUp(true);
26 | totalDeck.remove(top);
27 | discard.addTop(top);
28 | }
29 | });
30 | board.addDeck(totalDeck);
31 |
32 | var pile;
33 | var endPiles = [];
34 |
35 | for (var i = 1; i <= 7; i++) {
36 | pile = new Deck(board.defaultType, i - 1, 1);
37 | totalDeck.deal(pile, i, true);
38 |
39 | var topCard = pile.peek();
40 | if (topCard) {
41 | topCard.setFaceUp(true);
42 | }
43 |
44 | pile.setFilter((function (pile) {
45 | return function (card) {
46 | var top = pile.peek();
47 |
48 | if (top) {
49 | return (top.getColor() != card.getColor()) &&
50 | top.getRank() - card.getRank() ==1;
51 | } else {
52 | return card.getRank() == 13;
53 | }
54 | };
55 | })(pile));
56 |
57 | pile.observe((function (pile) {
58 | return function (event) {
59 | if (event.type == "remove") {
60 | if (pile.peek()) {
61 | pile.peek().setFaceUp(true);
62 | }
63 | }
64 | };
65 | })(pile));
66 |
67 | board.addDeck(pile);
68 | }
69 |
70 | for (i = 0; i < 4; i++) {
71 | endPiles[i] = new Deck(board.collapsedType, 3 + i, 0);
72 | board.addDeck(endPiles[i]);
73 | endPiles[i].setFilter((function (pile) {
74 | return function (card, deck, size) {
75 | if (size > 1) {
76 | return false;
77 | }
78 |
79 | var top = pile.peek();
80 |
81 | if (top) {
82 | return (top.getSuit() == card.getSuit()) &&
83 | (card.getRank() - top.getRank() == 1);
84 | } else {
85 | return card.getRank() == 1;
86 | }
87 | };
88 | })(endPiles[i]));
89 | }
90 | }
91 | $(document).ready(function() { new Solitaire(); });
--------------------------------------------------------------------------------
/demos/bigR.js:
--------------------------------------------------------------------------------
1 | function Solitaire() {
2 | var board = new Board({
3 | rootId : "Klondike",
4 | magicalX : 106
5 | });
6 |
7 | var totalDeck = new Deck(board.collapsedType, 0, 0, {
8 | filter : function () { return false; },
9 | draggable : false
10 | });
11 | totalDeck.initialize(false);
12 |
13 | var discard = new Deck(board.collapsedType, 1, 0, {
14 | filter : function(card) { return false; }
15 | });
16 | board.addDeck(discard);
17 |
18 | totalDeck.shuffle();
19 | totalDeck.setAction(action);
20 |
21 | function action() {
22 | var top = totalDeck.peek();
23 |
24 | if (!top) {
25 | discard.deal(totalDeck, discard.getCards().length, true);
26 | } else {
27 | top.setFaceUp(true);
28 | totalDeck.remove(top);
29 | discard.addTop(top);
30 | }
31 | }
32 | board.addDeck(totalDeck);
33 |
34 | var pile;
35 | var endPiles = [];
36 |
37 | for (var i = 1; i <= 7; i++) {
38 | pile = new Deck(board.defaultType, i - 1, 1);
39 | totalDeck.deal(pile, i, true);
40 |
41 | if (topCard) {
42 | var topCard = pile.peek();
43 | topCard.setFaceUp(true);
44 | }
45 |
46 | pile.setFilter((function (pile) {
47 | return function (card) {
48 | var top = pile.peek();
49 |
50 | if (top) {
51 | return (top.getColor() != card.getColor()) &&
52 | top.getRank() - card.getRank() ==1;
53 | } else {
54 | return card.getRank() == 13;
55 | }
56 | };
57 | })(pile));
58 |
59 | pile.observe((function (pile) {
60 | return function (event) {
61 | if (event.type == "remove") {
62 | if (pile.peek()) {
63 | pile.peek().setFaceUp(true);
64 | }
65 | }
66 | };
67 | })(pile));
68 |
69 | board.addDeck(pile);
70 | }
71 |
72 | for (i = 0; i < 4; i++) {
73 | endPiles[i] = new Deck(board.collapsedType, 3 + i, 0);
74 | board.addDeck(endPiles[i]);
75 | endPiles[i].setFilter((function (pile) {
76 | return function (card, deck, size) {
77 | if (size > 1) {
78 | return false;
79 | }
80 |
81 | var topCard = pile.peek();
82 |
83 | if (topCard) {
84 | return (topCard.getSuit() == card.getSuit()) &&
85 | (card.getRank() - topCard.getRank() == 1);
86 | } else {
87 | return card.getRank() == 1;
88 | }
89 | };
90 | })(endPiles[i]));
91 | }
92 | }
93 | $(document).ready(function() { new Solitaire(); });
--------------------------------------------------------------------------------
/demos/change.sty:
--------------------------------------------------------------------------------
1 | % Formatting for the Change type in Cow.Type
2 |
3 | \RequirePackage{color}
4 | \RequirePackage{synttree}
5 | \RequirePackage[usenames,dvipsnames]{xcolor}
6 |
7 | \newcommand{\Non}[1]{$#1$}
8 | \newcommand{\Mod}[2]{\colorbox{SkyBlue}{$#1 \to #2$}}
9 | \newcommand{\Ins}[1]{\colorbox{Emerald}{#1}}
10 | \newcommand{\Del}[1]{\colorbox{Maroon}{#1}}
11 | \newcommand{\From}[2]{\colorbox{Goldenrod}{$\langle #1 \rangle$#2}}
12 | \newcommand{\To}[2]{\colorbox{GreenYellow}{$\langle #1 \rangle$#2}}
13 | \newcommand{\Conflict}[2]{#1 $\ne$ #2}
14 | \newcommand{\NoConflict}[1]{#1}
--------------------------------------------------------------------------------
/demos/cow.css:
--------------------------------------------------------------------------------
1 | body {
2 | font-family : monospace;
3 | }
4 |
5 | .block {
6 | padding-left : 1em;
7 | }
8 |
9 | .ins {
10 | background-color : #3D3;
11 | }
12 |
13 | .del {
14 | background-color : #D33;
15 | }
16 |
17 | .mod {
18 | background-color : #D90;
19 | }
20 |
21 | .to {
22 | background-color : #99F;
23 | }
24 |
25 | .from {
26 | background-color : #F99;
27 | }
--------------------------------------------------------------------------------
/demos/cow.js:
--------------------------------------------------------------------------------
1 | $(function () {
2 | $("span.tagged").mouseover(function () {
3 | var classNumber = $(this).attr('class').match(/n\d+/)[0];
4 |
5 | $("." + classNumber).css('background', '#99D');
6 | });
7 |
8 | $("span.tagged").mouseout(function () {
9 | var classNumber = $(this).attr('class').match(/n\d+/)[0];
10 |
11 | $("." + classNumber).css('background', '');
12 | });
13 |
14 | $("span.from").mouseover(function () {
15 | var idNumber = $(this).attr('class').match(/id\d+/)[0];
16 |
17 | $("." + idNumber + ".to").css("box-shadow", "5px 5px 5px #AAA");
18 | });
19 | $("span.from").mouseout(function () {
20 | var idNumber = $(this).attr('class').match(/id\d+/)[0];
21 |
22 | $("." + idNumber + ".to").css("box-shadow", "");
23 | });
24 | $("span.to").mouseover(function () {
25 | var idNumber = $(this).attr('class').match(/id\d+/)[0];
26 |
27 | console.log($("." + idNumber + ".from").css("box-shadow", "5px 5px 5px #AAA"));
28 | $("." + idNumber + ".from").css("box-shadow", "5px 5px 5px #AAA");
29 | });
30 | $("span.to").mouseover(function () {
31 | var idNumber = $(this).attr('class').match(/id\d+/)[0];
32 |
33 | $("." + idNumber + ".from").css("box-shadow", "");
34 | });
35 | });
--------------------------------------------------------------------------------
/demos/diffL.js:
--------------------------------------------------------------------------------
1 | var x = 0,
2 | y = 0;
3 |
4 | while (x == 0) {
5 | x++
6 | y++
7 | console.log(x, y)
8 | }
--------------------------------------------------------------------------------
/demos/diffOut.html:
--------------------------------------------------------------------------------
1 |
2 |
3 | Cow: Semantic Diffing and Merging
4 |
5 |
6 |
7 |
8 |
9 | varxa=0.0yb=0.0