3. [代码][JavaScript]代码 跳至
/*
* Compare str
* @example var result = htmldiff.compare('str1','str2');
*
*
*/
var htmldiff = {
MODE_CHARACTER: 1,MODE_TAG: 2,MODE_WHITESPACE: 3,
ACTION_EQUAL: 1,ACTION_DELETE: 2,ACTION_INSERT: 3,ACTION_NONE: 4,ACTION_REPLACE: 5,
specialCaseOpeningTags: new Array('\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+', '\\s]+'),
specialCaseClosingTags: new Array('', '', '', '', '', '', '', '', '', ''),
content: '',
wordIndices: '',
oldWords: '',newWords: '',
compare: function(str1, str2) {
this.content = new Array();
this.wordIndices = new Array();
this.oldWords = this.ConvertHtmlToListOfWords(str1);
this.newWords = this.ConvertHtmlToListOfWords(str2);
this.wordIndices = this.IndexNewWords(this.newWords);
var b = this.Operations();
for (var c = 0; c < b.length; c++) {
var d = b[c];
this.PerformOperation(d);
}
return this.content.join('');
},
Operations: function() {
var d = 0;
var j = 0;
var a = new Array();
var f = this.MatchingBlocks();
f.push(this.Match(this.oldWords.length, this.newWords.length, 0));
for (var i = 0; i < f.length; i++) {
var g = f[i];
var b = (d == g.StartInOld);
var h = (j == g.StartInNew);
var c = this.ACTION_NONE;
if (b == false && h == false)
c = this.ACTION_REPLACE;
else {
if (b == true && h == false)
c = this.ACTION_INSERT;
else {
if (b == false && h == true)
c = this.ACTION_DELETE;
else
c = this.ACTION_NONE;
}
}
if (c != this.ACTION_NONE)
a.push(this.Operation(c, d, g.StartInOld, j, g.StartInNew));
if (g.length != 0)
a.push(this.Operation(this.ACTION_EQUAL, g.StartInOld, g.EndInOld(), g.StartInNew, g.EndInNew()));
d = g.EndInOld();
j = g.EndInNew();
}
return a;
},
MatchingBlocks: function() {
var a = new Array();
this.FindMatchingBlocks(0, this.oldWords.length, 0, this.newWords.length, a);
return a;
},
FindMatchingBlocks: function(c, b, f, e, d) {
var a = this.FindMatch(c, b, f, e);
if (a != null) {
if (c < a.StartInOld && f < a.StartInNew)
this.FindMatchingBlocks(c, a.StartInOld, f, a.StartInNew, d);
d.push(a);
if (a.EndInOld() < b && a.EndInNew() < e)
this.FindMatchingBlocks(a.EndInOld(), b, a.EndInNew(), e, d);
}
},
FindMatch: function(l, e, b, k) {
var f = l;
var m = b;
var n = 0;
var c = new Array();
for (var i = l; i < e; i++) {
var d = new Array();
var h = this.oldWords[i];
if (!this.wordIndices[h]) {
c = d;
continue;
}
for (var g = 0; g < this.wordIndices[h].length; g++) {
var a = this.wordIndices[h][g];
if (a < b) continue;
if (a >= k) break;
newMatchLength = (c[a - 1] ? c[a - 1] : 0) + 1;
d[a] = newMatchLength;
if (newMatchLength > n) {
f = i - newMatchLength + 1;
m = a - newMatchLength + 1;
n = newMatchLength;
}
}
c = d;
}
return n != 0 ? this.Match(f, m, n) : null;
},
IndexNewWords: function(d) {
var b = new Array();
for (var i = 0; i < d.length; i++) {
var c = d[i];
if (b[c])
b[c].push(i);
else
b[c] = [i];
}
return b;
},
ConvertHtmlToListOfWords: function(b) {
var f = this.MODE_CHARACTER;
var e = '';
var d = new Array();
for (var i = 0; i < b.length; i++) {
var c = b[i];
switch (f) {
case this.MODE_CHARACTER:
if (this.IsStartOfTag(c)) {
if (e)
d.push(e);
e = '<';
f = this.MODE_TAG;
} else {
if (this.IsWhiteSpace(c)) {
if (e)
d.push(e);
e = c;
f = this.MODE_WHITESPACE;
} else {console.log(e );
if (this.isNaW(e + c)) {
if (e)
d.push(e);
e = c;
} else
e = e + c;
}
}
break;
case this.MODE_TAG:
if (this.IsEndOfTag(c)) {
e = e + '>';
d.push(e);
e = '';
if (this.IsWhiteSpace(c))
f = this.MODE_WHITESPACE;
else
f = this.MODE_CHARACTER;
} else
e = e + c;
break;
case this.MODE_WHITESPACE:
if (this.IsStartOfTag(c)) {
if (e)
d.push(e);
e = '<';
f = this.MODE_TAG;
} else {
if (this.IsWhiteSpace(c))
e = e + c;
else {
if (e)
d.push(e);
e = c;
f = this.MODE_CHARACTER;
}
}
break;
default:
break;
}
}
if (e)
d.push(e);
return d;
},
PerformOperation: function(a) {
switch (a.Action) {
case this.ACTION_EQUAL:
this.ProcessEqualOperation(a);
break;
case this.ACTION_DELETE:
this.ProcessDeleteOperation(a, 'diffdel');
break;
case this.ACTION_INSERT:
this.ProcessInsertOperation(a, 'diffins');
break;
case this.ACTION_NONE:
break;
case this.ACTION_REPLACE:
this.ProcessReplaceOperation(a);
break;
default:
break;
}
},
ProcessReplaceOperation: function(a) {
this.ProcessDeleteOperation(a, 'diffmod');
this.ProcessInsertOperation(a, 'diffmod');
},
ProcessInsertOperation: function(b, a) {
var c = this.array_slice(this.newWords, b.StartInNew, b.EndInNew);
this.InsertTag('ins', a, c);
},
ProcessDeleteOperation: function(b, a) {
var c = this.array_slice(this.oldWords, b.StartInOld, b.EndInOld);
this.InsertTag('del', a, c);
},
ProcessEqualOperation: function(b) {
var a = this.array_slice(this.newWords, b.StartInNew, b.EndInNew);
this.content.push(a.join(''));
},
preg_match_array: function(b, e) {
var a = 0;
for (var i = 0; i < b.length; i++)
a |= (new RegExp(b[i])).test(e);
return a;
},
InsertTag: function(j, h, f) {
while (true) {
if (f.length == 0) break;
var b = this.ExtractConsecutiveWords(f, false);
var c = b.items;
f = b.words;
var a = '';
var e = false;
if (c.length != 0) {
var g = this.WrapText(c.join(''), j, h);
this.content.push(g);
} else {
if ( !! this.preg_match_array(this.specialCaseOpeningTags, f[0])) {
a = '';
if (j == 'del')
f.shift();
} else {
if (this.in_array(f[0], this.specialCaseClosingTags)) {
a = '';
e = true;
if (j == 'del')
f.shift();
}
}
}
if (f.length == 0 && a.length == 0) break;
if (e) {
var d = this.ExtractConsecutiveWords(f, true);
f = d.words;
this.content.push(a + d.items.join(''));
} else {
var d = this.ExtractConsecutiveWords(f, true);
f = d.words;
this.content.push(d.items.join('') + a);
}
}
},
in_array: function(b, c) {
for (var i = 0; i < c.length; i++) {
if (c[i] == b)
return true;
}
return false;
},
WrapText: function(c, b, a) {
return '<' + b + ' class="' + a + '">' + c + '';
},
ExtractConsecutiveWords: function(d, f) {
var e = false;
for (var b = 0; b < d.length; b++) {
var c = d[b];
if (f ? !this.IsTag(c) : !!this.IsTag(c)) {
e = b;
break;
}
}
if (e !== false) {
var a = this.array_slice(d, 0, e);
if (e > 0)
d.splice(0, e);
return {items: a,words: d};
} else {
a = d;
d = new Array();
return {items: a,words: d};
}
},
IsTag: function(b) {
var a = this.IsOpeningTag(b) || this.IsClosingTag(b);
return a;
},
IsOpeningTag: function(a) {
return /^\s*]+>\s*$/.test(a);
},
IsClosingTag: function(a) {
return /^\s*]+>\s*$/.test(a);
},
IsStartOfTag: function(a) {
return a == "<";
},
IsEndOfTag: function(a) {
return a == ">";
},
IsWhiteSpace: function(a) {
return /\s/.test(a);
},
isNaW: function(b) {
return /[^\x00-\x80]/.test(b);
},
array_slice: function(a, b, c, d) {
return a.slice(b, c);
},
Match: function(b, d, a) {
var c = {
StartInOld: b,
StartInNew: d,
Size: a
};
c.EndInOld = function() {
return b + a;
};
c.EndInNew = function() {
return d + a;
};
return c;
},
Operation: function(c, b, a, f, d) {
var e = {
Action: c,
StartInOld: b,
EndInOld: a,
StartInNew: f,
EndInNew: d
};
return e;
}
};
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