using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;

namespace RegexTester
{
 ///

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  ///

  #region Windows 窗体设计器生成的代码
  ///

  }
  #endregion

  ///

  private void SaveRegexButton_Click(object sender, System.EventArgs e) {
   saveFileDialog1.ShowDialog();
  }

  private void saveFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e) {
   StreamWriter streamWriterRegex=File.CreateText(saveFileDialog1.FileName);
   streamWriterRegex.Write(this.RegexTextBox.Text);
   streamWriterRegex.Close();
  }

  private void OpenRegexButton_Click(object sender, System.EventArgs e) {
   openFileDialog1.ShowDialog();
  }

  private void openFileDialog1_FileOk(object sender, System.ComponentModel.CancelEventArgs e) {
   StreamReader streamReaderRegex=File.OpenText(openFileDialog1.FileName);
   this.RegexTextBox.Text=streamReaderRegex.ReadToEnd();
   streamReaderRegex.Close();
  }
  private RegexOptions GetSelectedRegexOptions(){
   
   RegexOptions selectedRegexOptions=RegexOptions.None;
   
   if(this.IgnoreCaseChkBox.Checked)
    selectedRegexOptions |=RegexOptions.IgnoreCase;
   if(this.ExplicitCaptureChkBox.Checked)
    selectedRegexOptions |=RegexOptions.ExplicitCapture;
   if(this.ECMAScriptChkBox.Checked)
    selectedRegexOptions |=RegexOptions.ECMAScript;
   if(this.IgnorePatternWhiteSpaceChkBox.Checked)
    selectedRegexOptions |=RegexOptions.IgnorePatternWhitespace;
   if(this.MultiLineChkBox.Checked)
    selectedRegexOptions |=RegexOptions.Multiline;
   if(this.RightToLeftChkBox.Checked)
    selectedRegexOptions |=RegexOptions.RightToLeft;
   if(this.SingleLineChkBox.Checked)
    selectedRegexOptions |=RegexOptions.Singleline;

   return selectedRegexOptions;
  
  }

  private void SplitButton_Click(object sender, System.EventArgs e) {
   try{
    RegexOptions selectedRegexOptions =this.GetSelectedRegexOptions();
    Regex splitRegex=new Regex(this.RegexTextBox.Text,selectedRegexOptions);
    String[] splitResults;
    splitResults=splitRegex.Split(this.InputTextBox.Text);
    StringBuilder resultsString=new StringBuilder(this.InputTextBox.Text.Length);
    foreach(String stringElement in splitResults)
     resultsString.Append(stringElement+Environment.NewLine);
    this.ResultTextBox.ForeColor=Color.Black;
    this.RegexTextBox.Text=resultsString.ToString();
   }
   catch(ArgumentException ex){
    this.ResultTextBox.ForeColor=Color.Red;
    this.RegexTextBox.Text="There was an error in you regular expression:\r\n"+ex.Message;
   }

  }

  private void TestRegaxButton_Click(object sender, System.EventArgs e) {
   try{
    RegexOptions selectedRegexOptions=this.GetSelectedRegexOptions();
    Regex testRegex=new Regex(this.RegexTextBox.Text,selectedRegexOptions);
    if(testRegex.IsMatch(this.InputTextBox.Text)){
     this.ResultTextBox.ForeColor=Color.Black;
     this.ResultTextBox.Text="MATCH FOUND";
    }
    else{
     this.ResultTextBox.ForeColor=Color.Red;
     this.ResultTextBox.Text="NOT METCH FOUND";
    }
   }
   catch(ArgumentException ex){
    this.ResultTextBox.Text="There waw an error in you regular expression:\r\n"+ex.Message;
   }

  }

  private void ReplaceButton_Click(object sender, System.EventArgs e) {
   try{
    RegexOptions selectedRegexOptions=this.GetSelectedRegexOptions();
    Regex replaceRegex=new Regex(this.ResultTextBox.Text,selectedRegexOptions);
    this.ResultTextBox.ForeColor=Color.Black;
    this.ResultTextBox.Text=replaceRegex.Replace(this.InputTextBox.Text,this.ReplacementTextBox.Text);
   }
   catch(ArgumentException ex){
    this.ResultTextBox.ForeColor=Color.Red;
    this.ResultTextBox.Text="There was an error in you regular expression:\r\n"+ex.Message;
   }

  }

  private void MatchesButton_Click(object sender, System.EventArgs e) {
   try{
    RegexOptions selectedRegexOptions=this.GetSelectedRegexOptions();
    Regex matchesRegex=new Regex(this.RegexTextBox.Text,selectedRegexOptions);
    MatchCollection matchesFound;
    matchesFound=matchesRegex.Matches(this.InputTextBox.Text);
    String nextMatch="---------------------NEXT MATCH--------------------------\r\n";
    StringBuilder resultsString=new StringBuilder(64);
    foreach(Match matchMade in matchesFound)
     resultsString.Append(matchMade.Value+(Environment.NewLine+nextMatch));
    this.ResultTextBox.ForeColor=Color.Black;
    this.ResultTextBox.Text=resultsString.ToString();
   }
   catch(ArgumentException ex){
    this.ResultTextBox.ForeColor=Color.Red;
    this.ResultTextBox.Text="There was an error in your rgular expression:\r\n"+ex.Message;
   }

  }

 }
}