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|
// The MIT License(MIT)
// =====================
//
// Copyright © `2015-2017` `Lucas Meijer`
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the “Software”), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
namespace Mono.Linker.Tests.Extensions
{
public class NPath : IEquatable<NPath>, IComparable
{
private static readonly StringComparison PathStringComparison = IsLinux() ? StringComparison.Ordinal : StringComparison.OrdinalIgnoreCase;
private readonly string[] _elements;
private readonly bool _isRelative;
private readonly string _driveLetter;
#region construction
public NPath(string path)
{
if (path == null)
throw new ArgumentNullException();
path = ParseDriveLetter(path, out _driveLetter);
if (path == "/")
{
_isRelative = false;
_elements = new string[] { };
}
else
{
var split = path.Split('/', '\\');
_isRelative = _driveLetter == null && IsRelativeFromSplitString(split);
_elements = ParseSplitStringIntoElements(split.Where(s => s.Length > 0).ToArray());
}
}
private NPath(string[] elements, bool isRelative, string driveLetter)
{
_elements = elements;
_isRelative = isRelative;
_driveLetter = driveLetter;
}
private string[] ParseSplitStringIntoElements(IEnumerable<string> inputs)
{
var stack = new List<string>();
foreach (var input in inputs.Where(input => input.Length != 0))
{
if (input == ".")
{
if ((stack.Count > 0) && (stack.Last() != "."))
continue;
}
else if (input == "..")
{
if (HasNonDotDotLastElement(stack))
{
stack.RemoveAt(stack.Count - 1);
continue;
}
if (!_isRelative)
throw new ArgumentException("You cannot create a path that tries to .. past the root");
}
stack.Add(input);
}
return stack.ToArray();
}
private static bool HasNonDotDotLastElement(List<string> stack)
{
return stack.Count > 0 && stack[stack.Count - 1] != "..";
}
private string ParseDriveLetter(string path, out string driveLetter)
{
if (path.Length >= 2 && path[1] == ':')
{
driveLetter = path[0].ToString();
return path.Substring(2);
}
driveLetter = null;
return path;
}
private static bool IsRelativeFromSplitString(string[] split)
{
if (split.Length < 2)
return true;
return split[0].Length != 0 || !split.Any(s => s.Length > 0);
}
public NPath Combine(params string[] append)
{
return Combine(append.Select(a => new NPath(a)).ToArray());
}
public NPath Combine(params NPath[] append)
{
if (!append.All(p => p.IsRelative))
throw new ArgumentException("You cannot .Combine a non-relative path");
return new NPath(ParseSplitStringIntoElements(_elements.Concat(append.SelectMany(p => p._elements))), _isRelative, _driveLetter);
}
public NPath Parent
{
get
{
if (_elements.Length == 0)
throw new InvalidOperationException("Parent is called on an empty path");
var newElements = _elements.Take(_elements.Length - 1).ToArray();
return new NPath(newElements, _isRelative, _driveLetter);
}
}
public NPath RelativeTo(NPath path)
{
if (!IsChildOf(path))
{
if (!IsRelative && !path.IsRelative && _driveLetter != path._driveLetter)
throw new ArgumentException("Path.RelativeTo() was invoked with two paths that are on different volumes. invoked on: " + ToString() + " asked to be made relative to: " + path);
NPath commonParent = null;
foreach (var parent in RecursiveParents)
{
commonParent = path.RecursiveParents.FirstOrDefault(otherParent => otherParent == parent);
if (commonParent != null)
break;
}
if (commonParent == null)
throw new ArgumentException("Path.RelativeTo() was unable to find a common parent between " + ToString() + " and " + path);
if (IsRelative && path.IsRelative && commonParent.IsEmpty())
throw new ArgumentException("Path.RelativeTo() was invoked with two relative paths that do not share a common parent. Invoked on: " + ToString() + " asked to be made relative to: " + path);
var depthDiff = path.Depth - commonParent.Depth;
return new NPath(Enumerable.Repeat("..", depthDiff).Concat(_elements.Skip(commonParent.Depth)).ToArray(), true, null);
}
return new NPath(_elements.Skip(path._elements.Length).ToArray(), true, null);
}
public NPath ChangeExtension(string extension)
{
ThrowIfRoot();
var newElements = (string[])_elements.Clone();
newElements[newElements.Length - 1] = Path.ChangeExtension(_elements[_elements.Length - 1], WithDot(extension));
if (extension == string.Empty)
newElements[newElements.Length - 1] = newElements[newElements.Length - 1].TrimEnd('.');
return new NPath(newElements, _isRelative, _driveLetter);
}
#endregion construction
#region inspection
public bool IsRelative
{
get { return _isRelative; }
}
public string FileName
{
get
{
ThrowIfRoot();
return _elements.Last();
}
}
public string FileNameWithoutExtension
{
get { return Path.GetFileNameWithoutExtension(FileName); }
}
public IEnumerable<string> Elements
{
get { return _elements; }
}
public int Depth
{
get { return _elements.Length; }
}
public bool Exists(string append = "")
{
return Exists(new NPath(append));
}
public bool Exists(NPath append)
{
return FileExists(append) || DirectoryExists(append);
}
public bool DirectoryExists(string append = "")
{
return DirectoryExists(new NPath(append));
}
public bool DirectoryExists(NPath append)
{
return Directory.Exists(Combine(append).ToString());
}
public bool FileExists(string append = "")
{
return FileExists(new NPath(append));
}
public bool FileExists(NPath append)
{
return File.Exists(Combine(append).ToString());
}
public string ExtensionWithDot
{
get
{
if (IsRoot)
throw new ArgumentException("A root directory does not have an extension");
var last = _elements.Last();
var index = last.LastIndexOf(".");
if (index < 0) return String.Empty;
return last.Substring(index);
}
}
public string InQuotes()
{
return "\"" + ToString() + "\"";
}
public string InQuotes(SlashMode slashMode)
{
return "\"" + ToString(slashMode) + "\"";
}
public override string ToString()
{
return ToString(SlashMode.Native);
}
public string ToString(SlashMode slashMode)
{
// Check if it's linux root /
if (IsRoot && string.IsNullOrEmpty(_driveLetter))
return Slash(slashMode).ToString();
if (_isRelative && _elements.Length == 0)
return ".";
var sb = new StringBuilder();
if (_driveLetter != null)
{
sb.Append(_driveLetter);
sb.Append(":");
}
if (!_isRelative)
sb.Append(Slash(slashMode));
var first = true;
foreach (var element in _elements)
{
if (!first)
sb.Append(Slash(slashMode));
sb.Append(element);
first = false;
}
return sb.ToString();
}
public static implicit operator string(NPath path)
{
return path.ToString();
}
static char Slash(SlashMode slashMode)
{
switch (slashMode)
{
case SlashMode.Backward:
return '\\';
case SlashMode.Forward:
return '/';
default:
return Path.DirectorySeparatorChar;
}
}
public override bool Equals(Object obj)
{
if (obj == null)
return false;
// If parameter cannot be cast to Point return false.
var p = obj as NPath;
if ((Object)p == null)
return false;
return Equals(p);
}
public bool Equals(NPath p)
{
if (p._isRelative != _isRelative)
return false;
if (!string.Equals(p._driveLetter, _driveLetter, PathStringComparison))
return false;
if (p._elements.Length != _elements.Length)
return false;
for (var i = 0; i != _elements.Length; i++)
if (!string.Equals(p._elements[i], _elements[i], PathStringComparison))
return false;
return true;
}
public static bool operator ==(NPath a, NPath b)
{
// If both are null, or both are same instance, return true.
if (ReferenceEquals(a, b))
return true;
// If one is null, but not both, return false.
if (((object)a == null) || ((object)b == null))
return false;
// Return true if the fields match:
return a.Equals(b);
}
public override int GetHashCode()
{
unchecked
{
int hash = 17;
// Suitable nullity checks etc, of course :)
hash = hash * 23 + _isRelative.GetHashCode();
foreach (var element in _elements)
hash = hash * 23 + element.GetHashCode();
if (_driveLetter != null)
hash = hash * 23 + _driveLetter.GetHashCode();
return hash;
}
}
public int CompareTo(object obj)
{
if (obj == null)
return -1;
return this.ToString().CompareTo(((NPath)obj).ToString());
}
public static bool operator !=(NPath a, NPath b)
{
return !(a == b);
}
public bool HasExtension(params string[] extensions)
{
var extensionWithDotLower = ExtensionWithDot.ToLower();
return extensions.Any(e => WithDot(e).ToLower() == extensionWithDotLower);
}
private static string WithDot(string extension)
{
return extension.StartsWith(".") ? extension : "." + extension;
}
private bool IsEmpty()
{
return _elements.Length == 0;
}
public bool IsRoot
{
get { return _elements.Length == 0 && !_isRelative; }
}
#endregion inspection
#region directory enumeration
public IEnumerable<NPath> Files(string filter, bool recurse = false)
{
return Directory.GetFiles(ToString(), filter, recurse ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly).Select(s => new NPath(s));
}
public IEnumerable<NPath> Files(bool recurse = false)
{
return Files("*", recurse);
}
public IEnumerable<NPath> Contents(string filter, bool recurse = false)
{
return Files(filter, recurse).Concat(Directories(filter, recurse));
}
public IEnumerable<NPath> Contents(bool recurse = false)
{
return Contents("*", recurse);
}
public IEnumerable<NPath> Directories(string filter, bool recurse = false)
{
return Directory.GetDirectories(ToString(), filter, recurse ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly).Select(s => new NPath(s));
}
public IEnumerable<NPath> Directories(bool recurse = false)
{
return Directories("*", recurse);
}
#endregion
#region filesystem writing operations
public NPath CreateFile()
{
ThrowIfRelative();
ThrowIfRoot();
EnsureParentDirectoryExists();
File.WriteAllBytes(ToString(), new byte[0]);
return this;
}
public NPath CreateFile(string file)
{
return CreateFile(new NPath(file));
}
public NPath CreateFile(NPath file)
{
if (!file.IsRelative)
throw new ArgumentException("You cannot call CreateFile() on an existing path with a non relative argument");
return Combine(file).CreateFile();
}
public NPath CreateDirectory()
{
ThrowIfRelative();
if (IsRoot)
throw new NotSupportedException("CreateDirectory is not supported on a root level directory because it would be dangerous:" + ToString());
Directory.CreateDirectory(ToString());
return this;
}
public NPath CreateDirectory(string directory)
{
return CreateDirectory(new NPath(directory));
}
public NPath CreateDirectory(NPath directory)
{
if (!directory.IsRelative)
throw new ArgumentException("Cannot call CreateDirectory with an absolute argument");
return Combine(directory).CreateDirectory();
}
public NPath Copy(string dest)
{
return Copy(new NPath(dest));
}
public NPath Copy(string dest, Func<NPath, bool> fileFilter)
{
return Copy(new NPath(dest), fileFilter);
}
public NPath Copy(NPath dest)
{
return Copy(dest, p => true);
}
public NPath Copy(NPath dest, Func<NPath, bool> fileFilter)
{
ThrowIfRelative();
if (dest.IsRelative)
dest = Parent.Combine(dest);
if (dest.DirectoryExists())
return CopyWithDeterminedDestination(dest.Combine(FileName), fileFilter);
return CopyWithDeterminedDestination(dest, fileFilter);
}
public NPath MakeAbsolute()
{
if (!IsRelative)
return this;
return NPath.CurrentDirectory.Combine(this);
}
NPath CopyWithDeterminedDestination(NPath absoluteDestination, Func<NPath, bool> fileFilter)
{
if (absoluteDestination.IsRelative)
throw new ArgumentException("absoluteDestination must be absolute");
if (FileExists())
{
if (!fileFilter(absoluteDestination))
return null;
absoluteDestination.EnsureParentDirectoryExists();
File.Copy(ToString(), absoluteDestination.ToString(), true);
return absoluteDestination;
}
if (DirectoryExists())
{
absoluteDestination.EnsureDirectoryExists();
foreach (var thing in Contents())
thing.CopyWithDeterminedDestination(absoluteDestination.Combine(thing.RelativeTo(this)), fileFilter);
return absoluteDestination;
}
throw new ArgumentException("Copy() called on path that doesnt exist: " + ToString());
}
public void Delete(DeleteMode deleteMode = DeleteMode.Normal)
{
ThrowIfRelative();
if (IsRoot)
throw new NotSupportedException("Delete is not supported on a root level directory because it would be dangerous:" + ToString());
if (FileExists())
File.Delete(ToString());
else if (DirectoryExists())
try
{
Directory.Delete(ToString(), true);
}
catch (IOException)
{
if (deleteMode == DeleteMode.Normal)
throw;
}
else
throw new InvalidOperationException("Trying to delete a path that does not exist: " + ToString());
}
public void DeleteIfExists(DeleteMode deleteMode = DeleteMode.Normal)
{
ThrowIfRelative();
if (FileExists() || DirectoryExists())
Delete(deleteMode);
}
public NPath DeleteContents()
{
ThrowIfRelative();
if (IsRoot)
throw new NotSupportedException("DeleteContents is not supported on a root level directory because it would be dangerous:" + ToString());
if (FileExists())
throw new InvalidOperationException("It is not valid to perform this operation on a file");
if (DirectoryExists())
{
try
{
Files().Delete();
Directories().Delete();
}
catch (IOException)
{
if (Files(true).Any())
throw;
}
return this;
}
return EnsureDirectoryExists();
}
public static NPath CreateTempDirectory(string myprefix)
{
var random = new Random();
while (true)
{
var candidate = new NPath(Path.GetTempPath() + "/" + myprefix + "_" + random.Next());
if (!candidate.Exists())
return candidate.CreateDirectory();
}
}
public NPath Move(string dest)
{
return Move(new NPath(dest));
}
public NPath Move(NPath dest)
{
ThrowIfRelative();
if (IsRoot)
throw new NotSupportedException("Move is not supported on a root level directory because it would be dangerous:" + ToString());
if (dest.IsRelative)
return Move(Parent.Combine(dest));
if (dest.DirectoryExists())
return Move(dest.Combine(FileName));
if (FileExists())
{
dest.EnsureParentDirectoryExists();
File.Move(ToString(), dest.ToString());
return dest;
}
if (DirectoryExists())
{
Directory.Move(ToString(), dest.ToString());
return dest;
}
throw new ArgumentException("Move() called on a path that doesn't exist: " + ToString());
}
#endregion
#region special paths
public static NPath CurrentDirectory
{
get
{
return new NPath(Directory.GetCurrentDirectory());
}
}
public static NPath HomeDirectory
{
get
{
if (Path.DirectorySeparatorChar == '\\')
return new NPath(Environment.GetEnvironmentVariable("USERPROFILE"));
return new NPath(Environment.GetEnvironmentVariable("HOME"));
}
}
public static NPath SystemTemp
{
get
{
return new NPath(Path.GetTempPath());
}
}
#endregion
private void ThrowIfRelative()
{
if (_isRelative)
throw new ArgumentException("You are attempting an operation on a Path that requires an absolute path, but the path is relative");
}
private void ThrowIfRoot()
{
if (IsRoot)
throw new ArgumentException("You are attempting an operation that is not valid on a root level directory");
}
public NPath EnsureDirectoryExists(string append = "")
{
return EnsureDirectoryExists(new NPath(append));
}
public NPath EnsureDirectoryExists(NPath append)
{
var combined = Combine(append);
if (combined.DirectoryExists())
return combined;
combined.EnsureParentDirectoryExists();
combined.CreateDirectory();
return combined;
}
public NPath EnsureParentDirectoryExists()
{
var parent = Parent;
parent.EnsureDirectoryExists();
return parent;
}
public NPath FileMustExist()
{
if (!FileExists())
throw new FileNotFoundException("File was expected to exist : " + ToString());
return this;
}
public NPath DirectoryMustExist()
{
if (!DirectoryExists())
throw new DirectoryNotFoundException("Expected directory to exist : " + ToString());
return this;
}
public bool IsChildOf(string potentialBasePath)
{
return IsChildOf(new NPath(potentialBasePath));
}
public bool IsChildOf(NPath potentialBasePath)
{
if ((IsRelative && !potentialBasePath.IsRelative) || !IsRelative && potentialBasePath.IsRelative)
throw new ArgumentException("You can only call IsChildOf with two relative paths, or with two absolute paths");
// If the other path is the root directory, then anything is a child of it as long as it's not a Windows path
if (potentialBasePath.IsRoot)
{
if (_driveLetter != potentialBasePath._driveLetter)
return false;
return true;
}
if (IsEmpty())
return false;
if (Equals(potentialBasePath))
return true;
return Parent.IsChildOf(potentialBasePath);
}
public IEnumerable<NPath> RecursiveParents
{
get
{
var candidate = this;
while (true)
{
if (candidate.IsEmpty())
yield break;
candidate = candidate.Parent;
yield return candidate;
}
}
}
public NPath ParentContaining(string needle)
{
return ParentContaining(new NPath(needle));
}
public NPath ParentContaining(NPath needle)
{
ThrowIfRelative();
return RecursiveParents.FirstOrDefault(p => p.Exists(needle));
}
public NPath WriteAllText(string contents)
{
ThrowIfRelative();
EnsureParentDirectoryExists();
File.WriteAllText(ToString(), contents);
return this;
}
public string ReadAllText()
{
ThrowIfRelative();
return File.ReadAllText(ToString());
}
public NPath WriteAllLines(string[] contents)
{
ThrowIfRelative();
EnsureParentDirectoryExists();
File.WriteAllLines(ToString(), contents);
return this;
}
public string[] ReadAllLines()
{
ThrowIfRelative();
return File.ReadAllLines(ToString());
}
public IEnumerable<NPath> CopyFiles(NPath destination, bool recurse, Func<NPath, bool> fileFilter = null)
{
destination.EnsureDirectoryExists();
return Files(recurse).Where(fileFilter ?? AlwaysTrue).Select(file => file.Copy(destination.Combine(file.RelativeTo(this)))).ToArray();
}
public IEnumerable<NPath> MoveFiles(NPath destination, bool recurse, Func<NPath, bool> fileFilter = null)
{
if (IsRoot)
throw new NotSupportedException("MoveFiles is not supported on this directory because it would be dangerous:" + ToString());
destination.EnsureDirectoryExists();
return Files(recurse).Where(fileFilter ?? AlwaysTrue).Select(file => file.Move(destination.Combine(file.RelativeTo(this)))).ToArray();
}
static bool AlwaysTrue(NPath p)
{
return true;
}
private static bool IsLinux()
{
return Directory.Exists("/proc");
}
}
public static class Extensions
{
public static IEnumerable<NPath> Copy(this IEnumerable<NPath> self, string dest)
{
return Copy(self, new NPath(dest));
}
public static IEnumerable<NPath> Copy(this IEnumerable<NPath> self, NPath dest)
{
if (dest.IsRelative)
throw new ArgumentException("When copying multiple files, the destination cannot be a relative path");
dest.EnsureDirectoryExists();
return self.Select(p => p.Copy(dest.Combine(p.FileName))).ToArray();
}
public static IEnumerable<NPath> Move(this IEnumerable<NPath> self, string dest)
{
return Move(self, new NPath(dest));
}
public static IEnumerable<NPath> Move(this IEnumerable<NPath> self, NPath dest)
{
if (dest.IsRelative)
throw new ArgumentException("When moving multiple files, the destination cannot be a relative path");
dest.EnsureDirectoryExists();
return self.Select(p => p.Move(dest.Combine(p.FileName))).ToArray();
}
public static IEnumerable<NPath> Delete(this IEnumerable<NPath> self)
{
foreach (var p in self)
p.Delete();
return self;
}
public static IEnumerable<string> InQuotes(this IEnumerable<NPath> self, SlashMode forward = SlashMode.Native)
{
return self.Select(p => p.InQuotes(forward));
}
public static NPath ToNPath(this string path)
{
return new NPath(path);
}
}
public enum SlashMode
{
Native,
Forward,
Backward
}
public enum DeleteMode
{
Normal,
Soft
}
}
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