408 lines
11 KiB
JavaScript
408 lines
11 KiB
JavaScript
/***
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This is part of jsdifflib v1.0. <http://snowtide.com/jsdifflib>
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Copyright (c) 2007, Snowtide Informatics Systems, Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of the Snowtide Informatics Systems nor the names of its
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contributors may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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***/
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/* Author: Chas Emerick <cemerick@snowtide.com> */
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__whitespace = {" ":true, "\t":true, "\n":true, "\f":true, "\r":true};
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difflib = {
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defaultJunkFunction: function (c) {
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return __whitespace.hasOwnProperty(c);
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},
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stripLinebreaks: function (str) { return str.replace(/^[\n\r]*|[\n\r]*$/g, ""); },
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stringAsLines: function (str) {
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var lfpos = str.indexOf("\n");
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var crpos = str.indexOf("\r");
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var linebreak = ((lfpos > -1 && crpos > -1) || crpos < 0) ? "\n" : "\r";
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var lines = str.split(linebreak);
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for (var i = 0; i < lines.length; i++) {
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lines[i] = difflib.stripLinebreaks(lines[i]);
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}
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return lines;
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},
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// iteration-based reduce implementation
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__reduce: function (func, list, initial) {
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if (initial != null) {
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var value = initial;
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var idx = 0;
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} else if (list) {
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var value = list[0];
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var idx = 1;
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} else {
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return null;
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}
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for (; idx < list.length; idx++) {
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value = func(value, list[idx]);
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}
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return value;
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},
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// comparison function for sorting lists of numeric tuples
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__ntuplecomp: function (a, b) {
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var mlen = Math.max(a.length, b.length);
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for (var i = 0; i < mlen; i++) {
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if (a[i] < b[i]) return -1;
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if (a[i] > b[i]) return 1;
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}
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return a.length == b.length ? 0 : (a.length < b.length ? -1 : 1);
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},
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__calculate_ratio: function (matches, length) {
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return length ? 2.0 * matches / length : 1.0;
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},
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// returns a function that returns true if a key passed to the returned function
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// is in the dict (js object) provided to this function; replaces being able to
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// carry around dict.has_key in python...
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__isindict: function (dict) {
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return function (key) { return dict.hasOwnProperty(key); };
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},
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// replacement for python's dict.get function -- need easy default values
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__dictget: function (dict, key, defaultValue) {
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return dict.hasOwnProperty(key) ? dict[key] : defaultValue;
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},
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SequenceMatcher: function (a, b, isjunk) {
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this.set_seqs = function (a, b) {
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this.set_seq1(a);
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this.set_seq2(b);
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}
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this.set_seq1 = function (a) {
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if (a == this.a) return;
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this.a = a;
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this.matching_blocks = this.opcodes = null;
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}
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this.set_seq2 = function (b) {
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if (b == this.b) return;
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this.b = b;
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this.matching_blocks = this.opcodes = this.fullbcount = null;
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this.__chain_b();
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}
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this.__chain_b = function () {
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var b = this.b;
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var n = b.length;
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var b2j = this.b2j = {};
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var populardict = {};
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for (var i = 0; i < b.length; i++) {
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var elt = b[i];
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if (b2j.hasOwnProperty(elt)) {
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var indices = b2j[elt];
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if (n >= 200 && indices.length * 100 > n) {
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populardict[elt] = 1;
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delete b2j[elt];
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} else {
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indices.push(i);
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}
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} else {
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b2j[elt] = [i];
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}
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}
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for (var elt in populardict) {
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if (populardict.hasOwnProperty(elt)) {
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delete b2j[elt];
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}
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}
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var isjunk = this.isjunk;
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var junkdict = {};
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if (isjunk) {
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for (var elt in populardict) {
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if (populardict.hasOwnProperty(elt) && isjunk(elt)) {
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junkdict[elt] = 1;
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delete populardict[elt];
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}
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}
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for (var elt in b2j) {
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if (b2j.hasOwnProperty(elt) && isjunk(elt)) {
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junkdict[elt] = 1;
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delete b2j[elt];
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}
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}
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}
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this.isbjunk = difflib.__isindict(junkdict);
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this.isbpopular = difflib.__isindict(populardict);
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}
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this.find_longest_match = function (alo, ahi, blo, bhi) {
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var a = this.a;
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var b = this.b;
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var b2j = this.b2j;
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var isbjunk = this.isbjunk;
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var besti = alo;
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var bestj = blo;
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var bestsize = 0;
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var j = null;
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var j2len = {};
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var nothing = [];
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for (var i = alo; i < ahi; i++) {
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var newj2len = {};
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var jdict = difflib.__dictget(b2j, a[i], nothing);
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for (var jkey in jdict) {
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if (jdict.hasOwnProperty(jkey)) {
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j = jdict[jkey];
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if (j < blo) continue;
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if (j >= bhi) break;
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newj2len[j] = k = difflib.__dictget(j2len, j - 1, 0) + 1;
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if (k > bestsize) {
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besti = i - k + 1;
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bestj = j - k + 1;
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bestsize = k;
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}
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}
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}
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j2len = newj2len;
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}
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while (besti > alo && bestj > blo && !isbjunk(b[bestj - 1]) && a[besti - 1] == b[bestj - 1]) {
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besti--;
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bestj--;
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bestsize++;
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}
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while (besti + bestsize < ahi && bestj + bestsize < bhi &&
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!isbjunk(b[bestj + bestsize]) &&
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a[besti + bestsize] == b[bestj + bestsize]) {
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bestsize++;
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}
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while (besti > alo && bestj > blo && isbjunk(b[bestj - 1]) && a[besti - 1] == b[bestj - 1]) {
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besti--;
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bestj--;
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bestsize++;
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}
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while (besti + bestsize < ahi && bestj + bestsize < bhi && isbjunk(b[bestj + bestsize]) &&
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a[besti + bestsize] == b[bestj + bestsize]) {
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bestsize++;
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}
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return [besti, bestj, bestsize];
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}
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this.get_matching_blocks = function () {
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if (this.matching_blocks != null) return this.matching_blocks;
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var la = this.a.length;
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var lb = this.b.length;
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var queue = [[0, la, 0, lb]];
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var matching_blocks = [];
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var alo, ahi, blo, bhi, qi, i, j, k, x;
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while (queue.length) {
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qi = queue.pop();
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alo = qi[0];
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ahi = qi[1];
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blo = qi[2];
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bhi = qi[3];
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x = this.find_longest_match(alo, ahi, blo, bhi);
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i = x[0];
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j = x[1];
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k = x[2];
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if (k) {
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matching_blocks.push(x);
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if (alo < i && blo < j)
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queue.push([alo, i, blo, j]);
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if (i+k < ahi && j+k < bhi)
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queue.push([i + k, ahi, j + k, bhi]);
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}
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}
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matching_blocks.sort(difflib.__ntuplecomp);
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var i1 = j1 = k1 = block = 0;
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var non_adjacent = [];
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for (var idx in matching_blocks) {
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if (matching_blocks.hasOwnProperty(idx)) {
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block = matching_blocks[idx];
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i2 = block[0];
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j2 = block[1];
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k2 = block[2];
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if (i1 + k1 == i2 && j1 + k1 == j2) {
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k1 += k2;
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} else {
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if (k1) non_adjacent.push([i1, j1, k1]);
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i1 = i2;
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j1 = j2;
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k1 = k2;
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}
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}
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}
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if (k1) non_adjacent.push([i1, j1, k1]);
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non_adjacent.push([la, lb, 0]);
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this.matching_blocks = non_adjacent;
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return this.matching_blocks;
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}
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this.get_opcodes = function () {
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if (this.opcodes != null) return this.opcodes;
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var i = 0;
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var j = 0;
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var answer = [];
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this.opcodes = answer;
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var block, ai, bj, size, tag;
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var blocks = this.get_matching_blocks();
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for (var idx in blocks) {
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if (blocks.hasOwnProperty(idx)) {
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block = blocks[idx];
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ai = block[0];
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bj = block[1];
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size = block[2];
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tag = '';
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if (i < ai && j < bj) {
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tag = 'replace';
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} else if (i < ai) {
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tag = 'delete';
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} else if (j < bj) {
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tag = 'insert';
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}
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if (tag) answer.push([tag, i, ai, j, bj]);
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i = ai + size;
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j = bj + size;
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if (size) answer.push(['equal', ai, i, bj, j]);
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}
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}
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return answer;
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}
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// this is a generator function in the python lib, which of course is not supported in javascript
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// the reimplementation builds up the grouped opcodes into a list in their entirety and returns that.
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this.get_grouped_opcodes = function (n) {
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if (!n) n = 3;
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var codes = this.get_opcodes();
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if (!codes) codes = [["equal", 0, 1, 0, 1]];
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var code, tag, i1, i2, j1, j2;
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if (codes[0][0] == 'equal') {
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code = codes[0];
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tag = code[0];
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i1 = code[1];
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i2 = code[2];
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j1 = code[3];
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j2 = code[4];
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codes[0] = [tag, Math.max(i1, i2 - n), i2, Math.max(j1, j2 - n), j2];
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}
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if (codes[codes.length - 1][0] == 'equal') {
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code = codes[codes.length - 1];
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tag = code[0];
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i1 = code[1];
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i2 = code[2];
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j1 = code[3];
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j2 = code[4];
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codes[codes.length - 1] = [tag, i1, Math.min(i2, i1 + n), j1, Math.min(j2, j1 + n)];
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}
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var nn = n + n;
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var groups = [];
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for (var idx in codes) {
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if (codes.hasOwnProperty(idx)) {
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code = codes[idx];
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tag = code[0];
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i1 = code[1];
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i2 = code[2];
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j1 = code[3];
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j2 = code[4];
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if (tag == 'equal' && i2 - i1 > nn) {
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groups.push([tag, i1, Math.min(i2, i1 + n), j1, Math.min(j2, j1 + n)]);
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i1 = Math.max(i1, i2-n);
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j1 = Math.max(j1, j2-n);
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}
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groups.push([tag, i1, i2, j1, j2]);
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}
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}
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if (groups && groups[groups.length - 1][0] == 'equal') groups.pop();
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return groups;
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}
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this.ratio = function () {
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matches = difflib.__reduce(
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function (sum, triple) { return sum + triple[triple.length - 1]; },
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this.get_matching_blocks(), 0);
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return difflib.__calculate_ratio(matches, this.a.length + this.b.length);
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}
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this.quick_ratio = function () {
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var fullbcount, elt;
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if (this.fullbcount == null) {
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this.fullbcount = fullbcount = {};
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for (var i = 0; i < this.b.length; i++) {
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elt = this.b[i];
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fullbcount[elt] = difflib.__dictget(fullbcount, elt, 0) + 1;
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}
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}
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fullbcount = this.fullbcount;
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var avail = {};
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var availhas = difflib.__isindict(avail);
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var matches = numb = 0;
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for (var i = 0; i < this.a.length; i++) {
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elt = this.a[i];
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if (availhas(elt)) {
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numb = avail[elt];
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} else {
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numb = difflib.__dictget(fullbcount, elt, 0);
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}
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avail[elt] = numb - 1;
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if (numb > 0) matches++;
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}
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return difflib.__calculate_ratio(matches, this.a.length + this.b.length);
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}
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this.real_quick_ratio = function () {
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var la = this.a.length;
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var lb = this.b.length;
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return _calculate_ratio(Math.min(la, lb), la + lb);
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}
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this.isjunk = isjunk ? isjunk : difflib.defaultJunkFunction;
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this.a = this.b = null;
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this.set_seqs(a, b);
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}
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}
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