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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.Diagnostics;
using System.IO;
using System.Text;
namespace Microsoft.Scripting.Utils {
public static class IOUtils {
/// <summary>
/// Seeks the first character of a specified line in the text stream.
/// </summary>
/// <param name="reader">The reader.</param>
/// <param name="line">Line number. The current position is assumed to be line #1.</param>
/// <returns>
/// Returns <c>true</c> if the line is found, <b>false</b> otherwise.
/// </returns>
public static bool SeekLine(TextReader reader, int line) {
ContractUtils.RequiresNotNull(reader, "reader");
if (line < 1) throw new ArgumentOutOfRangeException("line");
if (line == 1) return true;
int current_line = 1;
for (; ; ) {
int c = reader.Read();
if (c == '\r') {
if (reader.Peek() == '\n') {
reader.Read();
}
current_line++;
if (current_line == line) return true;
} else if (c == '\n') {
current_line++;
if (current_line == line) return true;
} else if (c == -1) {
return false;
}
}
}
/// <summary>
/// Reads characters to a string until end position or a terminator is reached.
/// Doesn't include the terminator into the resulting string.
/// Returns <c>null</c>, if the reader is at the end position.
/// </summary>
public static string ReadTo(TextReader reader, char terminator) {
ContractUtils.RequiresNotNull(reader, "reader");
StringBuilder result = new StringBuilder();
int ch;
for (; ; ) {
ch = reader.Read();
if (ch == -1) break;
if (ch == terminator) return result.ToString();
result.Append((char)ch);
}
return (result.Length > 0) ? result.ToString() : null;
}
/// <summary>
/// Reads characters until end position or a terminator is reached.
/// Returns <c>true</c> if the character has been found (the reader is positioned right behind the character),
/// <c>false</c> otherwise.
/// </summary>
public static bool SeekTo(TextReader reader, char c) {
ContractUtils.RequiresNotNull(reader, "reader");
for (; ; ) {
int ch = reader.Read();
if (ch == -1) return false;
if (ch == c) return true;
}
}
public static string ToValidPath(string path) {
return ToValidPath(path, false, true);
}
public static string ToValidPath(string path, bool isMask) {
return ToValidPath(path, isMask, true);
}
public static string ToValidFileName(string path) {
return ToValidPath(path, false, false);
}
private static string ToValidPath(string path, bool isMask, bool isPath) {
Debug.Assert(!isMask || isPath);
if (String.IsNullOrEmpty(path)) {
return "_";
}
StringBuilder sb = new StringBuilder(path);
if (isPath) {
foreach (char c in Path.GetInvalidPathChars()) {
sb.Replace(c, '_');
}
} else {
#if SILVERLIGHT
foreach (char c in Path.GetInvalidPathChars()) {
sb.Replace(c, '_');
}
sb.Replace(':', '_').Replace('*', '_').Replace('?', '_').Replace('\\', '_').Replace('/', '_');
#else
foreach (char c in Path.GetInvalidFileNameChars()) {
sb.Replace(c, '_');
}
#endif
}
if (!isMask) {
sb.Replace('*', '_').Replace('?', '_');
}
return sb.ToString();
}
}
}
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