diff --git a/src/htmldiff.js b/src/htmldiff.js
new file mode 100644
index 0000000..a796f2d
--- /dev/null
+++ b/src/htmldiff.js
@@ -0,0 +1,368 @@
+var Match, calculate_operations, consecutive_where, create_index, diff, find_match, find_matching_blocks, html_to_tokens, is_end_of_tag, is_start_of_tag, is_tag, is_whitespace, isnt_tag, op_map, recursively_find_matching_blocks, render_operations, wrap;
+
+is_end_of_tag = function(char) {
+ return char === '>';
+};
+
+is_start_of_tag = function(char) {
+ return char === '<';
+};
+
+is_whitespace = function(char) {
+ return /^\s+$/.test(char);
+};
+
+is_tag = function(token) {
+ return /^\s*<[^>]+>\s*$/.test(token);
+};
+
+isnt_tag = function(token) {
+ return !is_tag(token);
+};
+
+Match = (function() {
+
+ function Match(start_in_before, start_in_after, length) {
+ this.start_in_before = start_in_before;
+ this.start_in_after = start_in_after;
+ this.length = length;
+ this.end_in_before = (this.start_in_before + this.length) - 1;
+ this.end_in_after = (this.start_in_after + this.length) - 1;
+ }
+
+ return Match;
+
+})();
+
+html_to_tokens = function(html) {
+ var char, current_word, mode, words, _i, _len;
+ mode = 'char';
+ current_word = '';
+ words = [];
+ for (_i = 0, _len = html.length; _i < _len; _i++) {
+ char = html[_i];
+ switch (mode) {
+ case 'tag':
+ if (is_end_of_tag(char)) {
+ current_word += '>';
+ words.push(current_word);
+ current_word = '';
+ if (is_whitespace(char)) {
+ mode = 'whitespace';
+ } else {
+ mode = 'char';
+ }
+ } else {
+ current_word += char;
+ }
+ break;
+ case 'char':
+ if (is_start_of_tag(char)) {
+ if (current_word) {
+ words.push(current_word);
+ }
+ current_word = '<';
+ mode = 'tag';
+ } else if (/\s/.test(char)) {
+ if (current_word) {
+ words.push(current_word);
+ }
+ current_word = char;
+ mode = 'whitespace';
+ } else if (/[\w\#@]+/i.test(char)) {
+ current_word += char;
+ } else {
+ if (current_word) {
+ words.push(current_word);
+ }
+ current_word = char;
+ }
+ break;
+ case 'whitespace':
+ if (is_start_of_tag(char)) {
+ if (current_word) {
+ words.push(current_word);
+ }
+ current_word = '<';
+ mode = 'tag';
+ } else if (is_whitespace(char)) {
+ current_word += char;
+ } else {
+ if (current_word) {
+ words.push(current_word);
+ }
+ current_word = char;
+ mode = 'char';
+ }
+ break;
+ default:
+ throw new Error("Unknown mode " + mode);
+ }
+ }
+ if (current_word) {
+ words.push(current_word);
+ }
+ return words;
+};
+
+find_match = function(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, start_in_before, end_in_before, start_in_after, end_in_after) {
+ var best_match_in_after, best_match_in_before, best_match_length, index_in_after, index_in_before, locations_in_after, looking_for, match, match_length_at, new_match_length, new_match_length_at, _i, _j, _len;
+ best_match_in_before = start_in_before;
+ best_match_in_after = start_in_after;
+ best_match_length = 0;
+ match_length_at = {};
+ for (index_in_before = _i = start_in_before; start_in_before <= end_in_before ? _i < end_in_before : _i > end_in_before; index_in_before = start_in_before <= end_in_before ? ++_i : --_i) {
+ new_match_length_at = {};
+ looking_for = before_tokens[index_in_before];
+ locations_in_after = index_of_before_locations_in_after_tokens[looking_for];
+ for (_j = 0, _len = locations_in_after.length; _j < _len; _j++) {
+ index_in_after = locations_in_after[_j];
+ if (index_in_after < start_in_after) {
+ continue;
+ }
+ if (index_in_after >= end_in_after) {
+ break;
+ }
+ if (match_length_at[index_in_after - 1] == null) {
+ match_length_at[index_in_after - 1] = 0;
+ }
+ new_match_length = match_length_at[index_in_after - 1] + 1;
+ new_match_length_at[index_in_after] = new_match_length;
+ if (new_match_length > best_match_length) {
+ best_match_in_before = index_in_before - new_match_length + 1;
+ best_match_in_after = index_in_after - new_match_length + 1;
+ best_match_length = new_match_length;
+ }
+ }
+ match_length_at = new_match_length_at;
+ }
+ if (best_match_length !== 0) {
+ match = new Match(best_match_in_before, best_match_in_after, best_match_length);
+ }
+ return match;
+};
+
+recursively_find_matching_blocks = function(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, start_in_before, end_in_before, start_in_after, end_in_after, matching_blocks) {
+ var match;
+ match = find_match(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, start_in_before, end_in_before, start_in_after, end_in_after);
+ if (match != null) {
+ if (start_in_before < match.start_in_before && start_in_after < match.start_in_after) {
+ recursively_find_matching_blocks(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, start_in_before, match.start_in_before, start_in_after, match.start_in_after, matching_blocks);
+ }
+ matching_blocks.push(match);
+ if (match.end_in_before <= end_in_before && match.end_in_after <= end_in_after) {
+ recursively_find_matching_blocks(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, match.end_in_before + 1, end_in_before, match.end_in_after + 1, end_in_after, matching_blocks);
+ }
+ }
+ return matching_blocks;
+};
+
+create_index = function(p) {
+ var idx, index, token, _i, _len, _ref;
+ if (p.find_these == null) {
+ throw new Error('params must have find_these key');
+ }
+ if (p.in_these == null) {
+ throw new Error('params must have in_these key');
+ }
+ index = {};
+ _ref = p.find_these;
+ for (_i = 0, _len = _ref.length; _i < _len; _i++) {
+ token = _ref[_i];
+ index[token] = [];
+ idx = p.in_these.indexOf(token);
+ while (idx !== -1) {
+ index[token].push(idx);
+ idx = p.in_these.indexOf(token, idx + 1);
+ }
+ }
+ return index;
+};
+
+find_matching_blocks = function(before_tokens, after_tokens) {
+ var index_of_before_locations_in_after_tokens, matching_blocks;
+ matching_blocks = [];
+ index_of_before_locations_in_after_tokens = create_index({
+ find_these: before_tokens,
+ in_these: after_tokens
+ });
+ return recursively_find_matching_blocks(before_tokens, after_tokens, index_of_before_locations_in_after_tokens, 0, before_tokens.length, 0, after_tokens.length, matching_blocks);
+};
+
+calculate_operations = function(before_tokens, after_tokens) {
+ var action_map, action_up_to_match_positions, index, is_single_whitespace, last_op, match, match_starts_at_current_position_in_after, match_starts_at_current_position_in_before, matches, op, operations, position_in_after, position_in_before, post_processed, _i, _j, _len, _len1;
+ if (before_tokens == null) {
+ throw new Error('before_tokens?');
+ }
+ if (after_tokens == null) {
+ throw new Error('after_tokens?');
+ }
+ position_in_before = position_in_after = 0;
+ operations = [];
+ action_map = {
+ 'false,false': 'replace',
+ 'true,false': 'insert',
+ 'false,true': 'delete',
+ 'true,true': 'none'
+ };
+ matches = find_matching_blocks(before_tokens, after_tokens);
+ matches.push(new Match(before_tokens.length, after_tokens.length, 0));
+ for (index = _i = 0, _len = matches.length; _i < _len; index = ++_i) {
+ match = matches[index];
+ match_starts_at_current_position_in_before = position_in_before === match.start_in_before;
+ match_starts_at_current_position_in_after = position_in_after === match.start_in_after;
+ action_up_to_match_positions = action_map[[match_starts_at_current_position_in_before, match_starts_at_current_position_in_after].toString()];
+ if (action_up_to_match_positions !== 'none') {
+ operations.push({
+ action: action_up_to_match_positions,
+ start_in_before: position_in_before,
+ end_in_before: (action_up_to_match_positions !== 'insert' ? match.start_in_before - 1 : void 0),
+ start_in_after: position_in_after,
+ end_in_after: (action_up_to_match_positions !== 'delete' ? match.start_in_after - 1 : void 0)
+ });
+ }
+ if (match.length !== 0) {
+ operations.push({
+ action: 'equal',
+ start_in_before: match.start_in_before,
+ end_in_before: match.end_in_before,
+ start_in_after: match.start_in_after,
+ end_in_after: match.end_in_after
+ });
+ }
+ position_in_before = match.end_in_before + 1;
+ position_in_after = match.end_in_after + 1;
+ }
+ post_processed = [];
+ last_op = {
+ action: 'none'
+ };
+ is_single_whitespace = function(op) {
+ if (op.action !== 'equal') {
+ return false;
+ }
+ if (op.end_in_before - op.start_in_before !== 0) {
+ return false;
+ }
+ return /^\s$/.test(before_tokens.slice(op.start_in_before, op.end_in_before + 1 || 9e9));
+ };
+ for (_j = 0, _len1 = operations.length; _j < _len1; _j++) {
+ op = operations[_j];
+ if (((is_single_whitespace(op)) && last_op.action === 'replace') || (op.action === 'replace' && last_op.action === 'replace')) {
+ last_op.end_in_before = op.end_in_before;
+ last_op.end_in_after = op.end_in_after;
+ } else {
+ post_processed.push(op);
+ last_op = op;
+ }
+ }
+ return post_processed;
+};
+
+consecutive_where = function(start, content, predicate) {
+ var answer, index, last_matching_index, token, _i, _len;
+ content = content.slice(start, content.length + 1 || 9e9);
+ last_matching_index = void 0;
+ for (index = _i = 0, _len = content.length; _i < _len; index = ++_i) {
+ token = content[index];
+ answer = predicate(token);
+ if (answer === true) {
+ last_matching_index = index;
+ }
+ if (answer === false) {
+ break;
+ }
+ }
+ if (last_matching_index != null) {
+ return content.slice(0, last_matching_index + 1 || 9e9);
+ }
+ return [];
+};
+
+wrap = function(tag, content) {
+ var length, non_tags, position, rendering, tags;
+ rendering = '';
+ position = 0;
+ length = content.length;
+ while (true) {
+ if (position >= length) {
+ break;
+ }
+ non_tags = consecutive_where(position, content, isnt_tag);
+ position += non_tags.length;
+ if (non_tags.length !== 0) {
+ rendering += "<" + tag + ">" + (non_tags.join('')) + "";
+ }
+ if (position >= length) {
+ break;
+ }
+ tags = consecutive_where(position, content, is_tag);
+ position += tags.length;
+ rendering += tags.join('');
+ }
+ return rendering;
+};
+
+op_map = {
+ equal: function(op, before_tokens, after_tokens) {
+ return before_tokens.slice(op.start_in_before, op.end_in_before + 1 || 9e9).join('');
+ },
+ insert: function(op, before_tokens, after_tokens) {
+ var val;
+ val = after_tokens.slice(op.start_in_after, op.end_in_after + 1 || 9e9);
+ return wrap('ins', val);
+ },
+ "delete": function(op, before_tokens, after_tokens) {
+ var val;
+ val = before_tokens.slice(op.start_in_before, op.end_in_before + 1 || 9e9);
+ return wrap('del', val);
+ }
+};
+
+op_map.replace = function(op, before_tokens, after_tokens) {
+ return (op_map["delete"](op, before_tokens, after_tokens)) + (op_map.insert(op, before_tokens, after_tokens));
+};
+
+render_operations = function(before_tokens, after_tokens, operations) {
+ var op, rendering, _i, _len;
+ rendering = '';
+ for (_i = 0, _len = operations.length; _i < _len; _i++) {
+ op = operations[_i];
+ rendering += op_map[op.action](op, before_tokens, after_tokens);
+ }
+ return rendering;
+};
+
+diff = function(before, after) {
+ var ops;
+ if (before === after) {
+ return before;
+ }
+ before = html_to_tokens(before);
+ after = html_to_tokens(after);
+ ops = calculate_operations(before, after);
+ return render_operations(before, after, ops);
+};
+
+diff.html_to_tokens = html_to_tokens;
+
+diff.find_matching_blocks = find_matching_blocks;
+
+find_matching_blocks.find_match = find_match;
+
+find_matching_blocks.create_index = create_index;
+
+diff.calculate_operations = calculate_operations;
+
+diff.render_operations = render_operations;
+
+if (typeof define === 'function') {
+ define([], function() {
+ return diff;
+ });
+} else if (typeof module !== "undefined" && module !== null) {
+ module.exports = diff;
+} else {
+ this.htmldiff = diff;
+}
+