Reputation:
So I have a very huge txt file with words and characters. For example:
Hello!ReturnHowSpaceAreSpaceYouKeyOemcomma
When I use the streamreader I would like to split it like this:
Hello!
How Are You ?
So when "Return" appears in text, do a break in lines. When it says "Space" replace it with an empty char " ". If there's "KeyOemcomma" replace it to "?".
How could I do this? I've tried many options but it didn't work for me..:/
Upvotes: 1
Views: 221
Reputation: 82474
If these are the only replacements you want, I would go with kakroo's answer.
However, if you have a longer list of stuff you need to replace, I would probably do it like this:
string input = "Hello!ReturnHowSpaceAreSpaceYouKeyOemcomma";
var replacements = new List<Tuple<string,string>>()
{
Tuple.Create("Return", "\n"),
Tuple.Create("Space", " "),
Tuple.Create("KeyOemcomma", "?") //, add whatever other replacements here...
};
var sb = new StringBuilder(input);
foreach(var replacement in replacements)
{
sb.Replace(replacement.Item1, replacement.Item2);
}
string result = sb.ToString();
You can see a live demo on rextester.
Upvotes: 0
Reputation: 2413
My solution with two streams:
using System;
using System.IO;
using System.Text;
using System.Collections.Generic;
class Transformer {
readonly StreamReader _input;
readonly Dictionary<string, char> _str2Char;
public Transformer(Stream stream, Dictionary<string, char> str2Char) {
_input = new StreamReader(stream);
_str2Char = str2Char;
}
public Stream Transfrom() {
var output = new StreamWriter(new MemoryStream());
int c = -1;
// Buffer to keep read chars
var buffer = new StringBuilder();
// Read until the end of stream (-1)
while ((c = _input.Read()) != -1) {
char ch = (char)c;
// We separate input stream by upper char
if (char.IsUpper(ch)) {
if (buffer.Length >= 2) {
var str = buffer.ToString();
// We have to process "KeyOemcomma" individually
bool isSpecialCase = str == "Key" && ch == 'O';
if (!isSpecialCase) {
WriteToOutput(str, output);
buffer.Clear();
}
// Here should be more logic, if it was not "KeyOemcomma"
buffer.Append(ch);
}
else buffer.Append(ch);
}
else buffer.Append(ch);
}
if (buffer.Length > 0) {
WriteToOutput(buffer.ToString(), output);
buffer.Clear();
}
output.Flush();
return output.BaseStream;
}
void WriteToOutput(string str, StreamWriter output) {
// Console.WriteLine(str);
char c;
if (_str2Char.TryGetValue(str, out c))
output.Write(c);
else
output.Write(str);
}
}
public class Program
{
public static void Main()
{
Dictionary<string, char> str2Char = new Dictionary<string, char> {
{"Return", '\n'},
{"Space", ' '},
{"KeyOemcomma", '?'}
};
string str = "Hello!ReturnHowSpaceAreSpaceYouKeyOemcomma";
var input = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(str));
var t = new Transformer(input, str2Char);
var output = t.Transfrom();
// Start reading output stream from the begining
output.Seek(0, SeekOrigin.Begin);
var s = new StreamReader(output);
int c;
while ((c = s.Read()) != -1) {
Console.Write((char)c);
}
}
}
Upvotes: 0
Reputation: 1113
Use StringBuilder
replace function. It's much faster than string
replace.
string a = "Hello!ReturnHowspaceyouspacearespacedoing?";
StringBuilder sb = new StringBuilder(a);
sb.Replace("Return", Environment.NewLine).Replace("space", " ");
Console.WriteLine(sb.ToString());
Check here for more info.
Upvotes: 4
Reputation: 5
Here is simple block of code that can do this:
string input = "Hello!ReturnHowSpaceAreSpaceYouKeyOemcomma";
var textAfterReplacingReturn = input.Replace("Return", "\n");
var textAfterReplacingSpace = textAfterReplacingReturn.Replace("Space", " ");
var finalText = textAfterReplacingSpace.Replace("KeyOemcomma", "?");
Console.WriteLine(finalText);
Of course, you can do replacing in one line:
string input = "Hello!ReturnHowSpaceAreSpaceYouKeyOemcomma";
var resultString = input.Replace("Return", "\n").Replace("Space", " ").Replace("KeyOemcomma", "?");
Console.WriteLine(resultString);
Upvotes: 0