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<%@ Page Language="C#" EnableViewState="False" %> | ||
<%@Import Namespace="System.IO" %> | ||
<%@Import Namespace="System.Globalization" %> | ||
<%@Import Namespace="System.Web.Script.Serialization" %> | ||
|
||
<script runat="server"> | ||
//============================================================================= | ||
// System : Sandcastle Help File Builder | ||
// File : SearchHelp.aspx | ||
// Author : Eric Woodruff (Eric@EWoodruff.us) | ||
// Updated : 02/17/2012 | ||
// Note : Copyright 2007-2012, Eric Woodruff, All rights reserved | ||
// Compiler: Microsoft C# | ||
// | ||
// This file contains the code used to search for keywords within the help | ||
// topics using the full-text index files created by the help file builder. | ||
// | ||
// This code is published under the Microsoft Public License (Ms-PL). A copy | ||
// of the license should be distributed with the code. It can also be found | ||
// at the project website: http://SHFB.CodePlex.com. This notice, the | ||
// author's name, and all copyright notices must remain intact in all | ||
// applications, documentation, and source files. | ||
// | ||
// Version Date Who Comments | ||
// ============================================================================ | ||
// 1.5.0.0 06/24/2007 EFW Created the code | ||
// 1.9.4.0 02/17/2012 EFW Switched to JSON serialization to support websites | ||
// that use something other than ASP.NET such as PHP. | ||
//============================================================================= | ||
private class Ranking | ||
{ | ||
public string Filename, PageTitle; | ||
public int Rank; | ||
public Ranking(string file, string title, int rank) | ||
{ | ||
Filename = file; | ||
PageTitle = title; | ||
Rank = rank; | ||
} | ||
} | ||
/// <summary> | ||
/// Render the search results | ||
/// </summary> | ||
/// <param name="writer">The writer to which the results are written</param> | ||
protected override void Render(HtmlTextWriter writer) | ||
{ | ||
JavaScriptSerializer jss = new JavaScriptSerializer(); | ||
string searchText, ftiFile; | ||
char letter; | ||
bool sortByTitle = false; | ||
jss.MaxJsonLength = Int32.MaxValue; | ||
// The keywords for which to search should be passed in the query string | ||
searchText = this.Request.QueryString["Keywords"]; | ||
if(String.IsNullOrEmpty(searchText)) | ||
{ | ||
writer.Write("<b class=\"PaddedText\">Nothing found</b>"); | ||
return; | ||
} | ||
// An optional SortByTitle option can also be specified | ||
if(this.Request.QueryString["SortByTitle"] != null) | ||
sortByTitle = Convert.ToBoolean(this.Request.QueryString["SortByTitle"]); | ||
List<string> keywords = this.ParseKeywords(searchText); | ||
List<char> letters = new List<char>(); | ||
List<string> fileList; | ||
Dictionary<string, List<long>> ftiWords, wordDictionary = | ||
new Dictionary<string,List<long>>(); | ||
// Load the file index | ||
using(StreamReader sr = new StreamReader(Server.MapPath("fti/FTI_Files.json"))) | ||
{ | ||
fileList = jss.Deserialize<List<string>>(sr.ReadToEnd()); | ||
} | ||
// Load the required word index files | ||
foreach(string word in keywords) | ||
{ | ||
letter = word[0]; | ||
if(!letters.Contains(letter)) | ||
{ | ||
letters.Add(letter); | ||
ftiFile = Server.MapPath(String.Format(CultureInfo.InvariantCulture, | ||
"fti/FTI_{0}.json", (int)letter)); | ||
if(File.Exists(ftiFile)) | ||
{ | ||
using(StreamReader sr = new StreamReader(ftiFile)) | ||
{ | ||
ftiWords = jss.Deserialize<Dictionary<string, List<long>>>(sr.ReadToEnd()); | ||
} | ||
foreach(string ftiWord in ftiWords.Keys) | ||
wordDictionary.Add(ftiWord, ftiWords[ftiWord]); | ||
} | ||
} | ||
} | ||
// Perform the search and return the results as a block of HTML | ||
writer.Write(this.Search(keywords, fileList, wordDictionary, sortByTitle)); | ||
} | ||
/// <summary> | ||
/// Split the search text up into keywords | ||
/// </summary> | ||
/// <param name="keywords">The keywords to parse</param> | ||
/// <returns>A list containing the words for which to search</returns> | ||
private List<string> ParseKeywords(string keywords) | ||
{ | ||
List<string> keywordList = new List<string>(); | ||
string checkWord; | ||
string[] words = Regex.Split(keywords, @"\W+"); | ||
foreach(string word in words) | ||
{ | ||
checkWord = word.ToLower(CultureInfo.InvariantCulture); | ||
if(checkWord.Length > 2 && !Char.IsDigit(checkWord[0]) && | ||
!keywordList.Contains(checkWord)) | ||
keywordList.Add(checkWord); | ||
} | ||
return keywordList; | ||
} | ||
/// <summary> | ||
/// Search for the specified keywords and return the results as a block of | ||
/// HTML. | ||
/// </summary> | ||
/// <param name="keywords">The keywords for which to search</param> | ||
/// <param name="fileInfo">The file list</param> | ||
/// <param name="wordDictionary">The dictionary used to find the words</param> | ||
/// <param name="sortByTitle">True to sort by title, false to sort by | ||
/// ranking</param> | ||
/// <returns>A block of HTML representing the search results.</returns> | ||
private string Search(List<string> keywords, List<string> fileInfo, | ||
Dictionary<string, List<long>> wordDictionary, bool sortByTitle) | ||
{ | ||
StringBuilder sb = new StringBuilder(10240); | ||
Dictionary<string, List<long>> matches = new Dictionary<string, List<long>>(); | ||
List<long> occurrences; | ||
List<int> matchingFileIndices = new List<int>(), | ||
occurrenceIndices = new List<int>(); | ||
List<Ranking> rankings = new List<Ranking>(); | ||
string filename, title; | ||
string[] fileIndex; | ||
bool isFirst = true; | ||
int idx, wordCount, matchCount; | ||
// TODO: Support boolean operators (AND, OR and maybe NOT) | ||
foreach(string word in keywords) | ||
{ | ||
if(!wordDictionary.TryGetValue(word, out occurrences)) | ||
return "<b class=\"PaddedText\">Nothing found</b>"; | ||
matches.Add(word, occurrences); | ||
occurrenceIndices.Clear(); | ||
// Get a list of the file indices for this match | ||
foreach(long entry in occurrences) | ||
occurrenceIndices.Add((int)(entry >> 16)); | ||
if(isFirst) | ||
{ | ||
isFirst = false; | ||
matchingFileIndices.AddRange(occurrenceIndices); | ||
} | ||
else | ||
{ | ||
// After the first match, remove files that do not appear for | ||
// all found keywords. | ||
for(idx = 0; idx < matchingFileIndices.Count; idx++) | ||
if(!occurrenceIndices.Contains(matchingFileIndices[idx])) | ||
{ | ||
matchingFileIndices.RemoveAt(idx); | ||
idx--; | ||
} | ||
} | ||
} | ||
if(matchingFileIndices.Count == 0) | ||
return "<b class=\"PaddedText\">Nothing found</b>"; | ||
// Rank the files based on the number of times the words occurs | ||
foreach(int index in matchingFileIndices) | ||
{ | ||
// Split out the title, filename, and word count | ||
fileIndex = fileInfo[index].Split('\x0'); | ||
title = fileIndex[0]; | ||
filename = fileIndex[1]; | ||
wordCount = Convert.ToInt32(fileIndex[2]); | ||
matchCount = 0; | ||
foreach(string word in keywords) | ||
{ | ||
occurrences = matches[word]; | ||
foreach(long entry in occurrences) | ||
if((int)(entry >> 16) == index) | ||
matchCount += (int)(entry & 0xFFFF); | ||
} | ||
rankings.Add(new Ranking(filename, title, matchCount * 1000 / wordCount)); | ||
} | ||
// Sort by rank in descending order or by page title in ascending order | ||
rankings.Sort(delegate (Ranking x, Ranking y) | ||
{ | ||
if(!sortByTitle) | ||
return y.Rank - x.Rank; | ||
return x.PageTitle.CompareTo(y.PageTitle); | ||
}); | ||
// Format the file list and return the results | ||
foreach(Ranking r in rankings) | ||
sb.AppendFormat("<div class=\"TreeItem\">\r\n<img src=\"../Item.gif\"/>" + | ||
"<a class=\"UnselectedNode\" target=\"_self\" " + | ||
"href=\"{0}\" onclick=\"javascript: SelectSearchNode(this);\">" + | ||
"{1}</a>\r\n</div>\r\n", r.Filename, r.PageTitle); | ||
// Return the keywords used as well in a hidden span | ||
sb.AppendFormat("<span id=\"SearchKeywords\" style=\"display: none\">{0}</span>", | ||
String.Join(" ", keywords.ToArray())); | ||
return sb.ToString(); | ||
} | ||
</script> |
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