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testEditDistance.html
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<!DOCTYPE html>
<html>
<!--
Copyright (c) 2014, Carnegie Mellon University.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-->
<head>
<title>Edit Distance Test</title>
<link rel="stylesheet" href="css/styles.css" type="text/css" media="screen">
<style type="text/css">
body {
font-size: 120% !important;
}
input {
font-size: 120% !important;
}
#outpt {
font-size: 150%;
}
.add {
color: #0c0;
}
.del {
color: #f00;
}
.ct {
font-size: 75%;
vertical-align: .5em;
}
.cb {
font-size: 75%;
}
</style>
<!-- Libraries -->
<script language="javascript" type="text/javascript" src="lib/jquery-1.5.2.js"></script>
<script language="javascript" type="text/javascript" src="lib/jquery-ui-1.8.12.custom.min.js"></script>
<script language="javascript" type="text/javascript">
function init() {
$("#btnreset").click(function() {
$("#st1").attr("value","");
$("#st2").attr("value","");
compute();
});
$("#st1").keyup(compute);
$("#st2").keyup(compute);
}
function compute() {
var s1 = $("#st1").attr("value");
var s2 = $("#st2").attr("value");
//$("#outpt").html(editdt_format(s1,s2) + "");
$("#outpt").empty();
$("#outpt").append(editdtp_format(s1,s2));
}
var SPACES = " ";
function rjust(st,len) {
return SPACES.substr(0,len-st.length)+st;
}
function strmat(mat,w) {
var st = "";
for (var i = 0; i < mat.length; ++i) {
for (var j = 0; j < mat[i].length; ++j) {
st += rjust(mat[i][j]+"",w);
}
st += "\n";
}
return st;
}
function strmatp(mat,w) {
var st = "";
for (var i = 0; i < mat.length; ++i) {
for (var j = 0; j < mat[i].length; ++j) {
var pval = [];
var p = mat[i][j];
for (var k = 0; k < mat[i][j].length; ++k) {
pval.push(p[k].f + "" + p[k].t + "" + p[k].p1 + "" + p[k].p2);
}
st += rjust(pval.join(","), w);
}
st += "\n";
}
return st;
}
/**
* Do some formatting of editdt to show addition/deletion/change
* @param s1 string "from"
* @param s2 string "to"
*/
function editdt_format(s1,s2) {
var diff = editdt(s1,s2);
var fmt = "";
for (var i = 0; i < diff.length; i += 2) {
var type = diff.charAt(i);
var c = diff.charAt(i+1);
if (type == "+") {
fmt += "<span class='add'>" + c + "</span>";
} else if (type == "-") {
fmt += "<span class='del'>" + c + "</span>";
} else {
fmt += "<span class='ct'>" + c +
"</span>/<span class='cb'>" + type + "</span>";
}
}
return fmt;
}
function editdtp_format(s1,s2) {
var diff = editdtp(s1,s2);
var dcont = $("<div>").css({"position": "relative"});
var BXW = 35; //box width
var BXH = 35; //box height
var SEP = 20; //separation between lines
var LINEW = 2; //connector line width
var mkrow = function() {
return $("<div>").css({
"position": "absolute"
});
};
var mkbox = function(c, dx) {
var box = $("<div>")
.css({
"position": "absolute",
"top": 0,
"width": BXW,
"height": BXH,
"left": dx*BXW,
"font-weight": "bold",
"border": "1px solid #666",
"text-align": "center"
})
.text(c);
return box;
};
var mkline = function(i1,i2,color) {
var cont = $("<div>")
.css({
"position": "absolute"
});
var mkl = function() {
return $("<div>")
.css({
"position": "absolute",
"background-color": color
});
}
var p1 = mkl()
.css({
"top": LINEW,
"left": i1*BXW,
"width": LINEW,
"height": SEP/2-LINEW
})
.appendTo(cont);
var p2 = mkl()
.css({
"top": SEP/2,
"left": Math.min(i1,i2)*BXW,
"width": Math.abs(i2-i1)*BXW+LINEW,
"height": LINEW
})
.appendTo(cont);
var p3 = mkl()
.css({
"top": SEP/2,
"left": i2*BXW,
"width": LINEW,
"height": SEP/2
})
.appendTo(cont);
return cont;
};
//add strings
var l1c = [];
var l1 = mkrow().appendTo(dcont);
for (var i = 0; i < s1.length; ++i) {
l1c.push(mkbox(s1.charAt(i), i));
l1.append(l1c[l1c.length-1]);
}
var l2c = [];
var l2 = mkrow().css({"top": BXH+SEP}).appendTo(dcont);
for (var i = 0; i < s2.length; ++i) {
l2c.push(mkbox(s2.charAt(i), i));
l2.append(l2c[l2c.length-1]);
}
//add diffs
var linecont = $("<div>")
.css({
"position": "absolute",
"top": BXH
}).appendTo(dcont);
for (var i = 0; i < diff.length; ++i) {
var d = diff[i];
var insertion = (d.f === "-");
var deletion = (d.t === "-");
var i1 = insertion ? d.p1 : d.p1 + 0.5;
var i2 = deletion ? d.p2 : d.p2 + 0.5;
var color = "#000";
if (insertion) {
color = "#0c0";
}
if (deletion) {
color = "#f00";
}
mkline(i1, i2, color).appendTo(linecont);
}
return dcont;
}
/**
* String edit distance with edit tracking and position tracking.
* f: character in source string
* t: character in destination string
* p1: position in source string
* p2: position in destination string
* @param s1 string "from"
* @param s2 string "to"
*/
function editdtp(s1,s2) {
var min3t = function(a,b,c) {
if (a.length < b.length && a.length < c.length) {
return a;
} else if (b.length < c.length) {
return b;
} else {
return c;
}
};
//allocate
var d = new Array();
for (var i = 0; i <= s1.length; ++i) {
d[i] = new Array();
for (var j = 0; j <= s2.length; ++j) {
d[i].push([]);
}
}
var dst = [];
for (var i = 0; i <= s1.length; ++i) {
d[i][0] = dst;
dst = dst.concat([{f: s1.charAt(i), t: "-", p1: i, p2: 0}]);
}
dst = [];
for (var i = 0; i <= s2.length; ++i) {
d[0][i] = dst;
dst = dst.concat([{f: "-", t: s2.charAt(i), v: "+" + s2.charAt(i), p1: 0, p2: i}]);
}
for (var j = 1; j <= s2.length; ++j) {
for (var i = 1; i <= s1.length; ++i) {
var c1 = s1.charAt(i-1) + "";
var c2 = s2.charAt(j-1) + "";
if (s1.charAt(i-1) == s2.charAt(j-1)) {
d[i][j] = d[i-1][j-1];
} else {
d[i][j] = min3t(
d[i-1][j].concat([{f: c1, t: "-", p1: i-1, p2: j}]),
d[i][j-1].concat([{f: "-", t: c2, p1: i, p2: j-1}]),
d[i-1][j-1].concat([{f: c1, t: c2, p1: i-1, p2: j-1}])
);
}
}
}
var rv = d[s1.length][s2.length];
return rv;
}
/**
* String edit distance with edit tracking
* @param s1 string "from"
* @param s2 string "to"
*/
function editdt(s1,s2) {
var min3t = function(a,b,c) {
if (a.length < b.length && a.length < c.length) {
return a;
} else if (b.length < c.length) {
return b;
} else {
return c;
}
};
//allocate
var d = new Array();
for (var i = 0; i <= s1.length; ++i) {
d[i] = new Array();
for (var j = 0; j <= s2.length; ++j) {
d[i].push("");
}
}
var dst = "";
for (var i = 0; i <= s1.length; ++i) {
d[i][0] = dst;
dst += "-" + s1.charAt(i);
}
dst = "";
for (var i = 0; i <= s2.length; ++i) {
d[0][i] = dst;
dst += "+" + s2.charAt(i);
}
for (var j = 1; j <= s2.length; ++j) {
for (var i = 1; i <= s1.length; ++i) {
var c1 = s1.charAt(i-1) + "";
var c2 = s2.charAt(j-1) + "";
if (s1.charAt(i-1) == s2.charAt(j-1)) {
d[i][j] = d[i-1][j-1];
} else {
d[i][j] = min3t(
d[i-1][j]+"-"+c1,
d[i][j-1]+"+"+c2,
d[i-1][j-1]+c1+c2
);
}
}
}
var rv = d[s1.length][s2.length];
return rv;
}
/**
* Basic string edit distance
*/
function editd(s1,s2) {
var min3 = function(a,b,c) {
if (a < b && a < c) {
return a;
} else if (b < c) {
return b;
} else {
return c;
}
};
//allocate
var d = new Array();
for (var i = 0; i <= s1.length; ++i) {
d[i] = new Array();
for (var j = 0; j <= s2.length; ++j) {
d[i].push(0);
}
}
for (var i = 0; i <= s1.length; ++i) {
d[i][0] = i;
}
for (var i = 0; i <= s2.length; ++i) {
d[0][i] = i;
}
for (var j = 1; j <= s2.length; ++j) {
for (var i = 1; i <= s1.length; ++i) {
if (s1.charAt(i-1) == s2.charAt(j-1)) {
d[i][j] = d[i-1][j-1];
} else {
d[i][j] = min3(
d[i-1][j]+1,
d[i][j-1]+1,
d[i-1][j-1]+1
);
}
}
}
return d[s1.length][s2.length];
}
</script>
</head>
<body onload="init()">
<div>
<div>String 1: <input type="text" id="st1" size="30"/></div>
<div>String 2: <input type="text" id="st2" size="30"/></div>
<div>
<button id="btnreset">reset</button>
<span style="margin-left: 10px;">
Legend:
<span class="add">Addition</span>
<span class="del">Deletion</span>
<span class="ct">new</span>/<span class="cb">old</span>Substitution
</span>
</div>
</div>
<hr>
<div id="outpt">
</div>
</body>
</html>