protected void Tester_Load(object sender, EventArgs e)
{
// set up some validators that depend on server-side constants
string lengthExpression = "^(.|\\s){0," + MAX_INPUT_LENGTH.ToString() + "}$";
revPatternLength.ValidationExpression = lengthExpression;
revPatternLength.ErrorMessage = string.Format(revPatternLength.ErrorMessage, MAX_INPUT_LENGTH);
revHaystackLength.ValidationExpression = lengthExpression;
revHaystackLength.ErrorMessage = string.Format(revHaystackLength.ErrorMessage, MAX_INPUT_LENGTH);
revReplacementLength.ValidationExpression = lengthExpression;
revReplacementLength.ErrorMessage = string.Format(revReplacementLength.ErrorMessage, MAX_INPUT_LENGTH);
rvMatchesLimit.MaximumValue = MAX_MATCHES.ToString();
rvMatchesLimit.ErrorMessage = string.Format(rvMatchesLimit.ErrorMessage, MAX_MATCHES);
if (!Page.IsPostBack)
{
// there may be stuff on the query string to load into the form
this.LoadFromQueryString();
if (txtPattern.Text.Length > 0 && txtHaystack.Text.Length > 0)
{
// we already have enough stuff from the query string to run the regex
Page.Validate();
RunRegex(true, DetailsPanels.All);
}
else
{
// starting off with empty pattern and haystack inputs
lblRegexInfoBlurb.Text = EMPTY_START_MESSAGE;
}
}
else if (ScriptManager.GetCurrent(this).IsInAsyncPostBack)
{
// get boolean for whether to update haystack backdrop
bool updateHaystackBackdrop = (hfUpdateHaystackBackdrop.Value == "true");
// translate detals tab id to details panel enum
DetailsPanels detailsPanel = DetailsPanels.None;
if (hfDetailsLink.Value == hlDetailsInfo.ClientID)
{
detailsPanel = DetailsPanels.RegexInfo;
}
else if (hfDetailsLink.Value == hlDetailsTable.ClientID)
{
detailsPanel = DetailsPanels.Table;
}
else if (hfDetailsLink.Value == hlDetailsContext.ClientID)
{
detailsPanel = DetailsPanels.Context;
}
else if (hfDetailsLink.Value == hlDetailsSplit.ClientID)
{
detailsPanel = DetailsPanels.SplitList;
}
// validate and run
Page.Validate();
RunRegex(updateHaystackBackdrop, detailsPanel);
}
}
protected void Update_Click(object sender, EventArgs e)
{
DetailsPanels.DataBind();
DetailsPanels.Visible = true;
UpdateDetails.Visible = false;
//set up object to use the web.config file
string connectionString = WebConfigurationManager.ConnectionStrings["photocatconnection"].ConnectionString;
//set up connection object called 'myConnection'
SqlConnection myConnection = new SqlConnection(connectionString);
//open database communication
myConnection.Open();
string fupdate = fnameedit.Text;
string supdate = snameedit.Text;
string eupdate = emailedit.Text;
string pupdate = passedit.Text;
int row = int.Parse(Request.QueryString["UserID"]);
string query = "UPDATE Users SET Forename = @newf, Surname = @news, Email = @newe, Password = @newp WHERE UserID = @id";
SqlCommand myCommand = new SqlCommand(query, myConnection);
//parameterised object
myCommand.Parameters.AddWithValue("@newf", fupdate);
myCommand.Parameters.AddWithValue("@news", supdate);
myCommand.Parameters.AddWithValue("@newe", eupdate);
myCommand.Parameters.AddWithValue("@newp", pupdate);
myCommand.Parameters.AddWithValue("@id", row);
myCommand.ExecuteNonQuery();
Details.DataBind();
myConnection.Close();
}
private void RunRegex(bool updateHaystackBackdrop, DetailsPanels detailsPanel)
{
bool isPageValid = false; // flag that keeps track of validation success
long elapsedMilliseconds = 0; // total time it took for the regex to run
// begin series of setup and validation steps
if (Page.IsValid)
{
// at this point, we know these are numerical values
startPosition = Convert.ToInt32(txtStartPosition.Text);
matchesLimit = Convert.ToInt32(txtMatchesLimit.Text);
// check numerical value of start position
if (startPosition > txtHaystack.Text.Length)
{
cvStartPositionMaxValue.IsValid = false;
}
if (Page.IsValid)
{
// browsers other than IE do not include \r in inputs during async postback
// this normalizes inputs to always have \r\n for newlines instead of just \n
txtPattern.Text = Regex.Replace(txtPattern.Text, "\r?\n", "\r\n");
txtHaystack.Text = Regex.Replace(txtHaystack.Text, "\r?\n", "\r\n");
txtReplacement.Text = Regex.Replace(txtReplacement.Text, "\r?\n", "\r\n");
// collect options
RegexOptions regexOptions = 0;
if (cbIgnoreCase.Checked)
{
regexOptions = regexOptions | RegexOptions.IgnoreCase;
}
if (cbIgnorePatternWhitespace.Checked)
{
regexOptions = regexOptions | RegexOptions.IgnorePatternWhitespace;
}
if (cbExplicitCapture.Checked)
{
regexOptions = regexOptions | RegexOptions.ExplicitCapture;
}
if (cbCultureInvariant.Checked)
{
regexOptions = regexOptions | RegexOptions.CultureInvariant;
}
if (cbSingleline.Checked)
{
regexOptions = regexOptions | RegexOptions.Singleline;
}
if (cbMultiline.Checked)
{
regexOptions = regexOptions | RegexOptions.Multiline;
}
if (cbRightToLeft.Checked)
{
regexOptions = regexOptions | RegexOptions.RightToLeft;
}
if (cbEcmaScript.Checked)
{
regexOptions = regexOptions | RegexOptions.ECMAScript;
}
// initialize new regex object, careful to catch any parsing exception from
// the pattern to show to the user as a validation error
try
{
testRegex = new Regex(txtPattern.Text, regexOptions);
}
catch (ArgumentOutOfRangeException)
{
// ECMA script option throws exception if used with certain other options
cvInvalidOptionsCombo.IsValid = false;
}
catch (ArgumentException ex)
{
// catch parsing exceptions, double check message to make sure it's
// the type of exception we're expecting
if (ex.Message.StartsWith("parsing") && ex.Message.Contains(" - "))
{
// display part of the exception message string as a validation error
cvPatternParsing.ErrorMessage = ex.Message.Substring(ex.Message.LastIndexOf(" - ") + 3).TrimEnd('.');
cvPatternParsing.IsValid = false;
}
}
if (Page.IsValid)
{
// the actual regex match execution happens within
elapsedMilliseconds = TimeLimitedRegexMatch();
if (Page.IsValid)
{
// winner!
isPageValid = true;
}
}
}
}
if (!isPageValid)
{
// page is invalid, will fall back to regex info details tab to show errors
hfHasMatches.Value = "false";
lblRegexInfoBlurb.Visible = false;
pnlPermalinkWrap.Visible = false;
hfDetailsLink.Value = hlDetailsInfo.ClientID;
upDetailsInfo.Update();
}
else
{
// page is valid
if (txtPattern.Text.Length == 0 || txtHaystack.Text.Length == 0)
{
// not enough input
hfHasMatches.Value = "false";
lblRegexInfoBlurb.Text = EMPTY_START_MESSAGE;
if (updateHaystackBackdrop)
{
// clear haystack backdrop (panel updated later)
hgcHaystackBackdrop.InnerHtml = "";
}
hfDetailsLink.Value = hlDetailsInfo.ClientID;
upDetailsInfo.Update();
}
else
{
// count matches
int matchesCount = Math.Min(matches.Count, matchesLimit);
// send this flag back to the page
hfHasMatches.Value = (matchesCount > 0) ? "true" : "false";
// regex info details panel doesn't require matches to be found
// furthermore, if no matches are found, active panel is reverted to regex info on client-side
if (matchesCount == 0 || detailsPanel == DetailsPanels.All || detailsPanel == DetailsPanels.RegexInfo)
{
// display matches count and timing info in the regex info blurb
lblRegexInfoBlurb.Text = "<strong>" + matchesCount.ToString() + "</strong>" +
(matchesCount == 1 ? " match" : " matches") +
" found in about " +
"<strong>" + elapsedMilliseconds.ToString() + "</strong>" +
(elapsedMilliseconds == 1 ? " millisecond" : " milliseconds") +
".";
SetPermalink();
hfDetailsLink.Value = hlDetailsInfo.ClientID;
upDetailsInfo.Update();
}
// all other details panels (and the haystack backdrop) require that matches were found
if (matchesCount > 0)
{
if (updateHaystackBackdrop)
{
string matchesInContext = testRegex.Replace(txtHaystack.Text,
new MatchEvaluator(MatchHighlightNoReplacements), matchesLimit, startPosition);
matchesInContext = HttpUtility.HtmlEncode(matchesInContext);
matchesInContext = matchesInContext.Replace(MATCH_HIGHLIGHT_LEFT_MARKER, "<em>");
matchesInContext = matchesInContext.Replace(MATCH_HIGHLIGHT_RIGHT_MARKER, "</em>");
// fix newline weirdness
matchesInContext = matchesInContext.Replace("\r", "");
// update haystack backdrop
hgcHaystackBackdrop.InnerHtml = '\n' + matchesInContext + '\n';
}
if (detailsPanel == DetailsPanels.All || detailsPanel == DetailsPanels.Context)
{
// both haystack backdrop and the context details panel need the string for matches in context
string matchesInContext = testRegex.Replace(txtHaystack.Text,
new MatchEvaluator(MatchHighlight), matchesLimit, startPosition);
matchesInContext = HttpUtility.HtmlEncode(matchesInContext);
matchesInContext = matchesInContext.Replace(MATCH_HIGHLIGHT_LEFT_MARKER, "<em>");
matchesInContext = matchesInContext.Replace(MATCH_HIGHLIGHT_RIGHT_MARKER, "</em>");
// fix newline weirdness
matchesInContext = matchesInContext.Replace("\r", "");
// update context details panel, adding zero-width spaces after newlines to
// ensure proper highlighting around line breaks
hgcDetailsContext.InnerHtml = "\n" + matchesInContext.Replace("\n", "\n​") + '\n';
upDetailsContext.Update();
}
if (detailsPanel == DetailsPanels.All || detailsPanel == DetailsPanels.Table)
{
// matches table
dlDetailsTable.DataSource = matches;
dlDetailsTable.DataBind();
upDetailsTable.Update();
}
if (detailsPanel == DetailsPanels.All || detailsPanel == DetailsPanels.SplitList)
{
// split list
hgcSplitList.Attributes.Add("start", "0");
rptSplitList.DataSource = testRegex.Split(txtHaystack.Text, matchesLimit, startPosition);
rptSplitList.DataBind();
upDetailsSplit.Update();
}
}
}
}
// this is just for users that don't have javascript on
if (hfHasMatches.Value == "true")
{
pnlDetailsTable.Style["display"] = "block";
pnlDetailsContext.Style["display"] = "block";
pnlDetailsSplit.Style["display"] = "block";
}
else
{
pnlDetailsTable.Style["display"] = "none";
pnlDetailsContext.Style["display"] = "none";
pnlDetailsSplit.Style["display"] = "none";
}
if (updateHaystackBackdrop)
{
upHaystackBackdrop.Update();
}
}