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//------------------------------------------------------------------------------
// <copyright file="RegexWorker.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* Base class for browser capabilities object: just a read-only dictionary
* holder that supports Init()
*
*
*/
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Globalization;
using System.Security.Permissions;
using System.Text;
using System.Text.RegularExpressions;
using System.Web.RegularExpressions;
using System.Web.Util;
namespace System.Web.Configuration {
//
public class RegexWorker {
internal static readonly Regex RefPat = new BrowserCapsRefRegex();
private Hashtable _groups;
private HttpBrowserCapabilities _browserCaps;
public RegexWorker(HttpBrowserCapabilities browserCaps) {
_browserCaps = browserCaps;
}
private string Lookup(string from) {
MatchCollection matches = RefPat.Matches(from);
// shortcut for no reference case
if (matches.Count == 0) {
return from;
}
StringBuilder sb = new StringBuilder();
int startIndex = 0;
foreach (Match match in matches) {
int length = match.Index - startIndex;
sb.Append(from.Substring(startIndex, length));
startIndex = match.Index + match.Length;
string groupName = match.Groups["name"].Value;
string result = null;
if (_groups != null) {
result = (String)_groups[groupName];
}
if (result == null) {
result = _browserCaps[groupName];
}
sb.Append(result);
}
sb.Append(from, startIndex, from.Length - startIndex);
string output = sb.ToString();
// Return null instead of empty string since empty string is used to override values.
if (output.Length == 0) {
return null;
}
return output;
}
public string this[string key] {
get {
return Lookup(key);
}
}
public bool ProcessRegex(string target, string regexExpression) {
if(target == null) {
target = String.Empty;
}
Regex regex = new Regex(regexExpression, RegexOptions.ExplicitCapture);
Match match = regex.Match(target);
if(match.Success == false) {
return false;
}
string[] groups = regex.GetGroupNames();
if (groups.Length > 0) {
if (_groups == null) {
_groups = new Hashtable();
}
for (int i = 0; i < groups.Length; i++) {
_groups[groups[i]] = match.Groups[i].Value;
}
}
return true;
}
}
}
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