//#define SelectorTrace
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// FileSelector.cs
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// ------------------------------------------------------------------
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//
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// Copyright (c) 2008-2011 Dino Chiesa.
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// All rights reserved.
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//
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// This code module is part of DotNetZip, a zipfile class library.
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//
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// ------------------------------------------------------------------
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//
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// This code is licensed under the Microsoft Public License.
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// See the file License.txt for the license details.
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// More info on: http://dotnetzip.codeplex.com
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//
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// ------------------------------------------------------------------
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//
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// last saved: <2011-August-05 11:03:11>
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//
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// ------------------------------------------------------------------
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//
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// This module implements a "file selector" that finds files based on a
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// set of inclusion criteria, including filename, size, file time, and
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// potentially file attributes. The criteria are given in a string with
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// a simple expression language. Examples:
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//
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// find all .txt files:
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// name = *.txt
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//
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// shorthand for the above
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// *.txt
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//
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// all files modified after January 1st, 2009
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// mtime > 2009-01-01
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//
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// All .txt files modified after the first of the year
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// name = *.txt AND mtime > 2009-01-01
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//
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// All .txt files modified after the first of the year, or any file with the archive bit set
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// (name = *.txt AND mtime > 2009-01-01) or (attribtues = A)
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//
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// All .txt files or any file greater than 1mb in size
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// (name = *.txt or size > 1mb)
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//
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// and so on.
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// ------------------------------------------------------------------
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using System;
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using System.IO;
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using System.Text;
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using System.Reflection;
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using System.ComponentModel;
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using System.Text.RegularExpressions;
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using System.Collections.Generic;
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#if SILVERLIGHT
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using System.Linq;
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#endif
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namespace HH.WMS.Utils.Ionic
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{
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/// <summary>
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/// Enumerates the options for a logical conjunction. This enum is intended for use
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/// internally by the FileSelector class.
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/// </summary>
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internal enum LogicalConjunction
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{
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NONE,
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AND,
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OR,
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XOR,
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}
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internal enum WhichTime
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{
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atime,
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mtime,
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ctime,
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}
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internal enum ComparisonOperator
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{
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[Description(">")]
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GreaterThan,
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[Description(">=")]
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GreaterThanOrEqualTo,
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[Description("<")]
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LesserThan,
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[Description("<=")]
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LesserThanOrEqualTo,
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[Description("=")]
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EqualTo,
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[Description("!=")]
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NotEqualTo
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}
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internal abstract partial class SelectionCriterion
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{
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internal virtual bool Verbose
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{
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get;set;
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}
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internal abstract bool Evaluate(string filename);
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[System.Diagnostics.Conditional("SelectorTrace")]
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protected static void CriterionTrace(string format, params object[] args)
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{
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//System.Console.WriteLine(" " + format, args);
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}
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}
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internal partial class SizeCriterion : SelectionCriterion
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{
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internal ComparisonOperator Operator;
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internal Int64 Size;
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("size ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(Size.ToString());
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return sb.ToString();
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}
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internal override bool Evaluate(string filename)
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{
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System.IO.FileInfo fi = new System.IO.FileInfo(filename);
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CriterionTrace("SizeCriterion::Evaluate('{0}' [{1}])",
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filename, this.ToString());
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return _Evaluate(fi.Length);
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}
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private bool _Evaluate(Int64 Length)
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{
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bool result = false;
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switch (Operator)
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{
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case ComparisonOperator.GreaterThanOrEqualTo:
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result = Length >= Size;
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break;
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case ComparisonOperator.GreaterThan:
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result = Length > Size;
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break;
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case ComparisonOperator.LesserThanOrEqualTo:
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result = Length <= Size;
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break;
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case ComparisonOperator.LesserThan:
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result = Length < Size;
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break;
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case ComparisonOperator.EqualTo:
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result = Length == Size;
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break;
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case ComparisonOperator.NotEqualTo:
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result = Length != Size;
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break;
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default:
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throw new ArgumentException("Operator");
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}
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return result;
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}
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}
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internal partial class TimeCriterion : SelectionCriterion
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{
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internal ComparisonOperator Operator;
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internal WhichTime Which;
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internal DateTime Time;
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(Which.ToString()).Append(" ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(Time.ToString("yyyy-MM-dd-HH:mm:ss"));
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return sb.ToString();
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}
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internal override bool Evaluate(string filename)
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{
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DateTime x;
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switch (Which)
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{
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case WhichTime.atime:
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x = System.IO.File.GetLastAccessTime(filename).ToUniversalTime();
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break;
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case WhichTime.mtime:
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x = System.IO.File.GetLastWriteTime(filename).ToUniversalTime();
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break;
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case WhichTime.ctime:
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x = System.IO.File.GetCreationTime(filename).ToUniversalTime();
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break;
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default:
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throw new ArgumentException("Operator");
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}
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CriterionTrace("TimeCriterion({0},{1})= {2}", filename, Which.ToString(), x);
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return _Evaluate(x);
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}
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private bool _Evaluate(DateTime x)
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{
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bool result = false;
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switch (Operator)
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{
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case ComparisonOperator.GreaterThanOrEqualTo:
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result = (x >= Time);
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break;
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case ComparisonOperator.GreaterThan:
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result = (x > Time);
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break;
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case ComparisonOperator.LesserThanOrEqualTo:
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result = (x <= Time);
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break;
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case ComparisonOperator.LesserThan:
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result = (x < Time);
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break;
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case ComparisonOperator.EqualTo:
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result = (x == Time);
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break;
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case ComparisonOperator.NotEqualTo:
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result = (x != Time);
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break;
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default:
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throw new ArgumentException("Operator");
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}
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CriterionTrace("TimeCriterion: {0}", result);
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return result;
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}
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}
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internal partial class NameCriterion : SelectionCriterion
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{
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private Regex _re;
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private String _regexString;
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internal ComparisonOperator Operator;
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private string _MatchingFileSpec;
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internal virtual string MatchingFileSpec
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{
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set
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{
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// workitem 8245
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if (Directory.Exists(value))
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{
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_MatchingFileSpec = ".\\" + value + "\\*.*";
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}
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else
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{
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_MatchingFileSpec = value;
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}
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_regexString = "^" +
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Regex.Escape(_MatchingFileSpec)
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.Replace(@"\\\*\.\*", @"\\([^\.]+|.*\.[^\\\.]*)")
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.Replace(@"\.\*", @"\.[^\\\.]*")
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.Replace(@"\*", @".*")
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//.Replace(@"\*", @"[^\\\.]*") // ill-conceived
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.Replace(@"\?", @"[^\\\.]")
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+ "$";
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CriterionTrace("NameCriterion regexString({0})", _regexString);
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_re = new Regex(_regexString, RegexOptions.IgnoreCase);
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}
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}
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("name ").Append(EnumUtil.GetDescription(Operator))
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.Append(" '")
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.Append(_MatchingFileSpec)
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.Append("'");
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return sb.ToString();
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}
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internal override bool Evaluate(string filename)
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{
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CriterionTrace("NameCriterion::Evaluate('{0}' pattern[{1}])",
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filename, _MatchingFileSpec);
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return _Evaluate(filename);
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}
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private bool _Evaluate(string fullpath)
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{
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CriterionTrace("NameCriterion::Evaluate({0})", fullpath);
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// No slash in the pattern implicitly means recurse, which means compare to
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// filename only, not full path.
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String f = (_MatchingFileSpec.IndexOf('\\') == -1)
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? System.IO.Path.GetFileName(fullpath)
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: fullpath; // compare to fullpath
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bool result = _re.IsMatch(f);
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if (Operator != ComparisonOperator.EqualTo)
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result = !result;
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return result;
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}
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}
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internal partial class TypeCriterion : SelectionCriterion
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{
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private char ObjectType; // 'D' = Directory, 'F' = File
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internal ComparisonOperator Operator;
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internal string AttributeString
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{
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get
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{
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return ObjectType.ToString();
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}
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set
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{
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if (value.Length != 1 ||
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(value[0]!='D' && value[0]!='F'))
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throw new ArgumentException("Specify a single character: either D or F");
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ObjectType = value[0];
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}
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}
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("type ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(AttributeString);
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return sb.ToString();
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}
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internal override bool Evaluate(string filename)
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{
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CriterionTrace("TypeCriterion::Evaluate({0})", filename);
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bool result = (ObjectType == 'D')
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? Directory.Exists(filename)
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: File.Exists(filename);
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if (Operator != ComparisonOperator.EqualTo)
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result = !result;
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return result;
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}
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}
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#if !SILVERLIGHT
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internal partial class AttributesCriterion : SelectionCriterion
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{
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private FileAttributes _Attributes;
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internal ComparisonOperator Operator;
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internal string AttributeString
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{
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get
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{
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string result = "";
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if ((_Attributes & FileAttributes.Hidden) != 0)
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result += "H";
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if ((_Attributes & FileAttributes.System) != 0)
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result += "S";
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if ((_Attributes & FileAttributes.ReadOnly) != 0)
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result += "R";
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if ((_Attributes & FileAttributes.Archive) != 0)
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result += "A";
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if ((_Attributes & FileAttributes.ReparsePoint) != 0)
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result += "L";
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if ((_Attributes & FileAttributes.NotContentIndexed) != 0)
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result += "I";
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return result;
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}
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set
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{
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_Attributes = FileAttributes.Normal;
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foreach (char c in value.ToUpper())
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{
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switch (c)
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{
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case 'H':
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if ((_Attributes & FileAttributes.Hidden) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.Hidden;
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break;
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case 'R':
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if ((_Attributes & FileAttributes.ReadOnly) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.ReadOnly;
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break;
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case 'S':
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if ((_Attributes & FileAttributes.System) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.System;
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break;
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case 'A':
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if ((_Attributes & FileAttributes.Archive) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.Archive;
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break;
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case 'I':
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if ((_Attributes & FileAttributes.NotContentIndexed) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.NotContentIndexed;
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break;
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case 'L':
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if ((_Attributes & FileAttributes.ReparsePoint) != 0)
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throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
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_Attributes |= FileAttributes.ReparsePoint;
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break;
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default:
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throw new ArgumentException(value);
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}
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}
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}
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}
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("attributes ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(AttributeString);
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return sb.ToString();
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}
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private bool _EvaluateOne(FileAttributes fileAttrs, FileAttributes criterionAttrs)
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{
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bool result = false;
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if ((_Attributes & criterionAttrs) == criterionAttrs)
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result = ((fileAttrs & criterionAttrs) == criterionAttrs);
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else
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result = true;
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return result;
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}
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internal override bool Evaluate(string filename)
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{
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// workitem 10191
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if (Directory.Exists(filename))
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{
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// Directories don't have file attributes, so the result
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// of an evaluation is always NO. This gets negated if
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// the operator is NotEqualTo.
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return (Operator != ComparisonOperator.EqualTo);
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}
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#if NETCF
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FileAttributes fileAttrs = NetCfFile.GetAttributes(filename);
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#else
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FileAttributes fileAttrs = System.IO.File.GetAttributes(filename);
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#endif
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return _Evaluate(fileAttrs);
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}
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private bool _Evaluate(FileAttributes fileAttrs)
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{
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bool result = _EvaluateOne(fileAttrs, FileAttributes.Hidden);
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if (result)
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result = _EvaluateOne(fileAttrs, FileAttributes.System);
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if (result)
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result = _EvaluateOne(fileAttrs, FileAttributes.ReadOnly);
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if (result)
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result = _EvaluateOne(fileAttrs, FileAttributes.Archive);
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if (result)
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result = _EvaluateOne(fileAttrs, FileAttributes.NotContentIndexed);
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if (result)
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result = _EvaluateOne(fileAttrs, FileAttributes.ReparsePoint);
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if (Operator != ComparisonOperator.EqualTo)
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result = !result;
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return result;
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}
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}
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#endif
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internal partial class CompoundCriterion : SelectionCriterion
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{
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internal LogicalConjunction Conjunction;
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internal SelectionCriterion Left;
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private SelectionCriterion _Right;
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internal SelectionCriterion Right
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{
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get { return _Right; }
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set
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{
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_Right = value;
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if (value == null)
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Conjunction = LogicalConjunction.NONE;
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else if (Conjunction == LogicalConjunction.NONE)
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Conjunction = LogicalConjunction.AND;
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}
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}
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internal override bool Evaluate(string filename)
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{
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bool result = Left.Evaluate(filename);
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switch (Conjunction)
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{
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case LogicalConjunction.AND:
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if (result)
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result = Right.Evaluate(filename);
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break;
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case LogicalConjunction.OR:
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if (!result)
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result = Right.Evaluate(filename);
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break;
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case LogicalConjunction.XOR:
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result ^= Right.Evaluate(filename);
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break;
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default:
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throw new ArgumentException("Conjunction");
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}
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return result;
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}
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public override String ToString()
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{
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StringBuilder sb = new StringBuilder();
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sb.Append("(")
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.Append((Left != null) ? Left.ToString() : "null")
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.Append(" ")
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.Append(Conjunction.ToString())
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.Append(" ")
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.Append((Right != null) ? Right.ToString() : "null")
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.Append(")");
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return sb.ToString();
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}
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}
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/// <summary>
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/// FileSelector encapsulates logic that selects files from a source - a zip file
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/// or the filesystem - based on a set of criteria. This class is used internally
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/// by the DotNetZip library, in particular for the AddSelectedFiles() methods.
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/// This class can also be used independently of the zip capability in DotNetZip.
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/// </summary>
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///
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/// <remarks>
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///
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/// <para>
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/// The FileSelector class is used internally by the ZipFile class for selecting
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/// files for inclusion into the ZipFile, when the <see
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/// cref="HH.WMS.Utils.Ionic.Zip.ZipFile.AddSelectedFiles(String,String)"/> method, or one of
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/// its overloads, is called. It's also used for the <see
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/// cref="HH.WMS.Utils.Ionic.Zip.ZipFile.ExtractSelectedEntries(String)"/> methods. Typically, an
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/// application that creates or manipulates Zip archives will not directly
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/// interact with the FileSelector class.
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/// </para>
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///
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/// <para>
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/// Some applications may wish to use the FileSelector class directly, to
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/// select files from disk volumes based on a set of criteria, without creating or
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/// querying Zip archives. The file selection criteria include: a pattern to
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/// match the filename; the last modified, created, or last accessed time of the
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/// file; the size of the file; and the attributes of the file.
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/// </para>
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///
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/// <para>
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/// Consult the documentation for <see cref="SelectionCriteria"/>
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/// for more information on specifying the selection criteria.
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/// </para>
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///
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/// </remarks>
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public partial class FileSelector
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{
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internal SelectionCriterion _Criterion;
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#if NOTUSED
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/// <summary>
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/// The default constructor.
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/// </summary>
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/// <remarks>
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/// Typically, applications won't use this constructor. Instead they'll
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/// call the constructor that accepts a selectionCriteria string. If you
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/// use this constructor, you'll want to set the SelectionCriteria
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/// property on the instance before calling SelectFiles().
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/// </remarks>
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protected FileSelector() { }
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#endif
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/// <summary>
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/// Constructor that allows the caller to specify file selection criteria.
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/// </summary>
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///
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/// <remarks>
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/// <para>
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/// This constructor allows the caller to specify a set of criteria for
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/// selection of files.
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/// </para>
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///
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/// <para>
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/// See <see cref="FileSelector.SelectionCriteria"/> for a description of
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/// the syntax of the selectionCriteria string.
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/// </para>
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///
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/// <para>
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/// By default the FileSelector will traverse NTFS Reparse Points. To
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/// change this, use <see cref="FileSelector(String,
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/// bool)">FileSelector(String, bool)</see>.
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/// </para>
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/// </remarks>
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///
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/// <param name="selectionCriteria">The criteria for file selection.</param>
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public FileSelector(String selectionCriteria)
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: this(selectionCriteria, true)
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{
|
}
|
|
/// <summary>
|
/// Constructor that allows the caller to specify file selection criteria.
|
/// </summary>
|
///
|
/// <remarks>
|
/// <para>
|
/// This constructor allows the caller to specify a set of criteria for
|
/// selection of files.
|
/// </para>
|
///
|
/// <para>
|
/// See <see cref="FileSelector.SelectionCriteria"/> for a description of
|
/// the syntax of the selectionCriteria string.
|
/// </para>
|
/// </remarks>
|
///
|
/// <param name="selectionCriteria">The criteria for file selection.</param>
|
/// <param name="traverseDirectoryReparsePoints">
|
/// whether to traverse NTFS reparse points (junctions).
|
/// </param>
|
public FileSelector(String selectionCriteria, bool traverseDirectoryReparsePoints)
|
{
|
if (!String.IsNullOrEmpty(selectionCriteria))
|
_Criterion = _ParseCriterion(selectionCriteria);
|
TraverseReparsePoints = traverseDirectoryReparsePoints;
|
}
|
|
|
|
/// <summary>
|
/// The string specifying which files to include when retrieving.
|
/// </summary>
|
/// <remarks>
|
///
|
/// <para>
|
/// Specify the criteria in statements of 3 elements: a noun, an operator,
|
/// and a value. Consider the string "name != *.doc" . The noun is
|
/// "name". The operator is "!=", implying "Not Equal". The value is
|
/// "*.doc". That criterion, in English, says "all files with a name that
|
/// does not end in the .doc extension."
|
/// </para>
|
///
|
/// <para>
|
/// Supported nouns include "name" (or "filename") for the filename;
|
/// "atime", "mtime", and "ctime" for last access time, last modfied time,
|
/// and created time of the file, respectively; "attributes" (or "attrs")
|
/// for the file attributes; "size" (or "length") for the file length
|
/// (uncompressed); and "type" for the type of object, either a file or a
|
/// directory. The "attributes", "type", and "name" nouns all support =
|
/// and != as operators. The "size", "atime", "mtime", and "ctime" nouns
|
/// support = and !=, and >, >=, <, <= as well. The times are
|
/// taken to be expressed in local time.
|
/// </para>
|
///
|
/// <para>
|
/// Specify values for the file attributes as a string with one or more of
|
/// the characters H,R,S,A,I,L in any order, implying file attributes of
|
/// Hidden, ReadOnly, System, Archive, NotContextIndexed, and ReparsePoint
|
/// (symbolic link) respectively.
|
/// </para>
|
///
|
/// <para>
|
/// To specify a time, use YYYY-MM-DD-HH:mm:ss or YYYY/MM/DD-HH:mm:ss as
|
/// the format. If you omit the HH:mm:ss portion, it is assumed to be
|
/// 00:00:00 (midnight).
|
/// </para>
|
///
|
/// <para>
|
/// The value for a size criterion is expressed in integer quantities of
|
/// bytes, kilobytes (use k or kb after the number), megabytes (m or mb),
|
/// or gigabytes (g or gb).
|
/// </para>
|
///
|
/// <para>
|
/// The value for a name is a pattern to match against the filename,
|
/// potentially including wildcards. The pattern follows CMD.exe glob
|
/// rules: * implies one or more of any character, while ? implies one
|
/// character. If the name pattern contains any slashes, it is matched to
|
/// the entire filename, including the path; otherwise, it is matched
|
/// against only the filename without the path. This means a pattern of
|
/// "*\*.*" matches all files one directory level deep, while a pattern of
|
/// "*.*" matches all files in all directories.
|
/// </para>
|
///
|
/// <para>
|
/// To specify a name pattern that includes spaces, use single quotes
|
/// around the pattern. A pattern of "'* *.*'" will match all files that
|
/// have spaces in the filename. The full criteria string for that would
|
/// be "name = '* *.*'" .
|
/// </para>
|
///
|
/// <para>
|
/// The value for a type criterion is either F (implying a file) or D
|
/// (implying a directory).
|
/// </para>
|
///
|
/// <para>
|
/// Some examples:
|
/// </para>
|
///
|
/// <list type="table">
|
/// <listheader>
|
/// <term>criteria</term>
|
/// <description>Files retrieved</description>
|
/// </listheader>
|
///
|
/// <item>
|
/// <term>name != *.xls </term>
|
/// <description>any file with an extension that is not .xls
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>name = *.mp3 </term>
|
/// <description>any file with a .mp3 extension.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>*.mp3</term>
|
/// <description>(same as above) any file with a .mp3 extension.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>attributes = A </term>
|
/// <description>all files whose attributes include the Archive bit.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>attributes != H </term>
|
/// <description>all files whose attributes do not include the Hidden bit.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>mtime > 2009-01-01</term>
|
/// <description>all files with a last modified time after January 1st, 2009.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>ctime > 2009/01/01-03:00:00</term>
|
/// <description>all files with a created time after 3am (local time),
|
/// on January 1st, 2009.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>size > 2gb</term>
|
/// <description>all files whose uncompressed size is greater than 2gb.
|
/// </description>
|
/// </item>
|
///
|
/// <item>
|
/// <term>type = D</term>
|
/// <description>all directories in the filesystem. </description>
|
/// </item>
|
///
|
/// </list>
|
///
|
/// <para>
|
/// You can combine criteria with the conjunctions AND, OR, and XOR. Using
|
/// a string like "name = *.txt AND size >= 100k" for the
|
/// selectionCriteria retrieves entries whose names end in .txt, and whose
|
/// uncompressed size is greater than or equal to 100 kilobytes.
|
/// </para>
|
///
|
/// <para>
|
/// For more complex combinations of criteria, you can use parenthesis to
|
/// group clauses in the boolean logic. Absent parenthesis, the
|
/// precedence of the criterion atoms is determined by order of
|
/// appearance. Unlike the C# language, the AND conjunction does not take
|
/// precendence over the logical OR. This is important only in strings
|
/// that contain 3 or more criterion atoms. In other words, "name = *.txt
|
/// and size > 1000 or attributes = H" implies "((name = *.txt AND size
|
/// > 1000) OR attributes = H)" while "attributes = H OR name = *.txt
|
/// and size > 1000" evaluates to "((attributes = H OR name = *.txt)
|
/// AND size > 1000)". When in doubt, use parenthesis.
|
/// </para>
|
///
|
/// <para>
|
/// Using time properties requires some extra care. If you want to
|
/// retrieve all entries that were last updated on 2009 February 14,
|
/// specify "mtime >= 2009-02-14 AND mtime < 2009-02-15". Read this
|
/// to say: all files updated after 12:00am on February 14th, until
|
/// 12:00am on February 15th. You can use the same bracketing approach to
|
/// specify any time period - a year, a month, a week, and so on.
|
/// </para>
|
///
|
/// <para>
|
/// The syntax allows one special case: if you provide a string with no
|
/// spaces, it is treated as a pattern to match for the filename.
|
/// Therefore a string like "*.xls" will be equivalent to specifying "name
|
/// = *.xls". This "shorthand" notation does not work with compound
|
/// criteria.
|
/// </para>
|
///
|
/// <para>
|
/// There is no logic in this class that insures that the inclusion
|
/// criteria are internally consistent. For example, it's possible to
|
/// specify criteria that says the file must have a size of less than 100
|
/// bytes, as well as a size that is greater than 1000 bytes. Obviously
|
/// no file will ever satisfy such criteria, but this class does not check
|
/// for or detect such inconsistencies.
|
/// </para>
|
///
|
/// </remarks>
|
///
|
/// <exception cref="System.Exception">
|
/// Thrown in the setter if the value has an invalid syntax.
|
/// </exception>
|
public String SelectionCriteria
|
{
|
get
|
{
|
if (_Criterion == null) return null;
|
return _Criterion.ToString();
|
}
|
set
|
{
|
if (value == null) _Criterion = null;
|
else if (value.Trim() == "") _Criterion = null;
|
else
|
_Criterion = _ParseCriterion(value);
|
}
|
}
|
|
/// <summary>
|
/// Indicates whether searches will traverse NTFS reparse points, like Junctions.
|
/// </summary>
|
public bool TraverseReparsePoints
|
{
|
get; set;
|
}
|
|
|
private enum ParseState
|
{
|
Start,
|
OpenParen,
|
CriterionDone,
|
ConjunctionPending,
|
Whitespace,
|
}
|
|
|
private static class RegexAssertions
|
{
|
public static readonly String PrecededByOddNumberOfSingleQuotes = "(?<=(?:[^']*'[^']*')*'[^']*)";
|
public static readonly String FollowedByOddNumberOfSingleQuotesAndLineEnd = "(?=[^']*'(?:[^']*'[^']*')*[^']*$)";
|
|
public static readonly String PrecededByEvenNumberOfSingleQuotes = "(?<=(?:[^']*'[^']*')*[^']*)";
|
public static readonly String FollowedByEvenNumberOfSingleQuotesAndLineEnd = "(?=(?:[^']*'[^']*')*[^']*$)";
|
}
|
|
|
private static string NormalizeCriteriaExpression(string source)
|
{
|
// The goal here is to normalize the criterion expression. At output, in
|
// the transformed criterion string, every significant syntactic element
|
// - a property element, grouping paren for the boolean logic, operator
|
// ( = < > != ), conjunction, or property value - will be separated from
|
// its neighbors by at least one space. Thus,
|
//
|
// before after
|
// -------------------------------------------------------------------
|
// name=*.txt name = *.txt
|
// (size>100)AND(name=*.txt) ( size > 100 ) AND ( name = *.txt )
|
//
|
// This is relatively straightforward using regular expression
|
// replacement. This method applies a distinct regex pattern and
|
// corresponding replacement string for each one of a number of cases:
|
// an open paren followed by a word; a word followed by a close-paren; a
|
// pair of open parens; a close paren followed by a word (which should
|
// then be followed by an open paren). And so on. These patterns and
|
// replacements are all stored in prPairs. By applying each of these
|
// regex replacements in turn, we get the transformed string. Easy.
|
//
|
// The resulting "normalized" criterion string, is then used as the
|
// subject that gets parsed, by splitting the string into tokens that
|
// are separated by spaces. Here, there's a twist. The spaces within
|
// single-quote delimiters do not delimit distinct tokens. So, this
|
// normalization method temporarily replaces those spaces with
|
// ASCII 6 (0x06), a control character which is not a legal
|
// character in a filename. The parsing logic that happens later will
|
// revert that change, restoring the original value of the filename
|
// specification.
|
//
|
// To illustrate, for a "before" string of [(size>100)AND(name='Name
|
// (with Parens).txt')] , the "after" string is [( size > 100 ) AND
|
// ( name = 'Name\u0006(with\u0006Parens).txt' )].
|
//
|
|
string[][] prPairs =
|
{
|
// A. opening double parens - insert a space between them
|
new string[] { @"([^']*)\(\(([^']+)", "$1( ($2" },
|
|
// B. closing double parens - insert a space between
|
new string[] { @"(.)\)\)", "$1) )" },
|
|
// C. single open paren with a following word - insert a space between
|
new string[] { @"\((\S)", "( $1" },
|
|
// D. single close paren with a preceding word - insert a space between the two
|
new string[] { @"(\S)\)", "$1 )" },
|
|
// E. close paren at line start?, insert a space before the close paren
|
// this seems like a degenerate case. I don't recall why it's here.
|
new string[] { @"^\)", " )" },
|
|
// F. a word (likely a conjunction) followed by an open paren - insert a space between
|
new string[] { @"(\S)\(", "$1 (" },
|
|
// G. single close paren followed by word - insert a paren after close paren
|
new string[] { @"\)(\S)", ") $1" },
|
|
// H. insert space between = and a following single quote
|
//new string[] { @"(=|!=)('[^']*')", "$1 $2" },
|
new string[] { @"(=)('[^']*')", "$1 $2" },
|
|
// I. insert space between property names and the following operator
|
//new string[] { @"([^ ])([><(?:!=)=])", "$1 $2" },
|
new string[] { @"([^ !><])(>|<|!=|=)", "$1 $2" },
|
|
// J. insert spaces between operators and the following values
|
//new string[] { @"([><(?:!=)=])([^ ])", "$1 $2" },
|
new string[] { @"(>|<|!=|=)([^ =])", "$1 $2" },
|
|
// K. replace fwd slash with backslash
|
new string[] { @"/", "\\" },
|
};
|
|
string interim = source;
|
|
for (int i=0; i < prPairs.Length; i++)
|
{
|
//char caseIdx = (char)('A' + i);
|
string pattern = RegexAssertions.PrecededByEvenNumberOfSingleQuotes +
|
prPairs[i][0] +
|
RegexAssertions.FollowedByEvenNumberOfSingleQuotesAndLineEnd;
|
|
interim = Regex.Replace(interim, pattern, prPairs[i][1]);
|
}
|
|
// match a fwd slash, followed by an odd number of single quotes.
|
// This matches fwd slashes only inside a pair of single quote delimiters,
|
// eg, a filename. This must be done as well as the case above, to handle
|
// filenames specified inside quotes as well as filenames without quotes.
|
var regexPattern = @"/" +
|
RegexAssertions.FollowedByOddNumberOfSingleQuotesAndLineEnd;
|
// replace with backslash
|
interim = Regex.Replace(interim, regexPattern, "\\");
|
|
// match a space, followed by an odd number of single quotes.
|
// This matches spaces only inside a pair of single quote delimiters.
|
regexPattern = " " +
|
RegexAssertions.FollowedByOddNumberOfSingleQuotesAndLineEnd;
|
|
// Replace all spaces that appear inside single quotes, with
|
// ascii 6. This allows a split on spaces to get tokens in
|
// the expression. The split will not split any filename or
|
// wildcard that appears within single quotes. After tokenizing, we
|
// need to replace ascii 6 with ascii 32 to revert the
|
// spaces within quotes.
|
return Regex.Replace(interim, regexPattern, "\u0006");
|
}
|
|
|
private static SelectionCriterion _ParseCriterion(String s)
|
{
|
if (s == null) return null;
|
|
// inject spaces after open paren and before close paren, etc
|
s = NormalizeCriteriaExpression(s);
|
|
// no spaces in the criteria is shorthand for filename glob
|
if (s.IndexOf(" ") == -1)
|
s = "name = " + s;
|
|
// split the expression into tokens
|
string[] tokens = s.Trim().Split(' ', '\t');
|
|
if (tokens.Length < 3) throw new ArgumentException(s);
|
|
SelectionCriterion current = null;
|
|
LogicalConjunction pendingConjunction = LogicalConjunction.NONE;
|
|
ParseState state;
|
var stateStack = new System.Collections.Generic.Stack<ParseState>();
|
var critStack = new System.Collections.Generic.Stack<SelectionCriterion>();
|
stateStack.Push(ParseState.Start);
|
|
for (int i = 0; i < tokens.Length; i++)
|
{
|
string tok1 = tokens[i].ToLower();
|
switch (tok1)
|
{
|
case "and":
|
case "xor":
|
case "or":
|
state = stateStack.Peek();
|
if (state != ParseState.CriterionDone)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
if (tokens.Length <= i + 3)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
pendingConjunction = (LogicalConjunction)Enum.Parse(typeof(LogicalConjunction), tokens[i].ToUpper(), true);
|
current = new CompoundCriterion { Left = current, Right = null, Conjunction = pendingConjunction };
|
stateStack.Push(state);
|
stateStack.Push(ParseState.ConjunctionPending);
|
critStack.Push(current);
|
break;
|
|
case "(":
|
state = stateStack.Peek();
|
if (state != ParseState.Start && state != ParseState.ConjunctionPending && state != ParseState.OpenParen)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
if (tokens.Length <= i + 4)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
stateStack.Push(ParseState.OpenParen);
|
break;
|
|
case ")":
|
state = stateStack.Pop();
|
if (stateStack.Peek() != ParseState.OpenParen)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
stateStack.Pop();
|
stateStack.Push(ParseState.CriterionDone);
|
break;
|
|
case "atime":
|
case "ctime":
|
case "mtime":
|
if (tokens.Length <= i + 2)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
DateTime t;
|
try
|
{
|
t = DateTime.ParseExact(tokens[i + 2], "yyyy-MM-dd-HH:mm:ss", null);
|
}
|
catch (FormatException)
|
{
|
try
|
{
|
t = DateTime.ParseExact(tokens[i + 2], "yyyy/MM/dd-HH:mm:ss", null);
|
}
|
catch (FormatException)
|
{
|
try
|
{
|
t = DateTime.ParseExact(tokens[i + 2], "yyyy/MM/dd", null);
|
}
|
catch (FormatException)
|
{
|
try
|
{
|
t = DateTime.ParseExact(tokens[i + 2], "MM/dd/yyyy", null);
|
}
|
catch (FormatException)
|
{
|
t = DateTime.ParseExact(tokens[i + 2], "yyyy-MM-dd", null);
|
}
|
}
|
}
|
}
|
t= DateTime.SpecifyKind(t, DateTimeKind.Local).ToUniversalTime();
|
current = new TimeCriterion
|
{
|
Which = (WhichTime)Enum.Parse(typeof(WhichTime), tokens[i], true),
|
Operator = (ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]),
|
Time = t
|
};
|
i += 2;
|
stateStack.Push(ParseState.CriterionDone);
|
break;
|
|
|
case "length":
|
case "size":
|
if (tokens.Length <= i + 2)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
Int64 sz = 0;
|
string v = tokens[i + 2];
|
if (v.ToUpper().EndsWith("K"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024;
|
else if (v.ToUpper().EndsWith("KB"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024;
|
else if (v.ToUpper().EndsWith("M"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024 * 1024;
|
else if (v.ToUpper().EndsWith("MB"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024 * 1024;
|
else if (v.ToUpper().EndsWith("G"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024 * 1024 * 1024;
|
else if (v.ToUpper().EndsWith("GB"))
|
sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024 * 1024 * 1024;
|
else sz = Int64.Parse(tokens[i + 2]);
|
|
current = new SizeCriterion
|
{
|
Size = sz,
|
Operator = (ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1])
|
};
|
i += 2;
|
stateStack.Push(ParseState.CriterionDone);
|
break;
|
|
case "filename":
|
case "name":
|
{
|
if (tokens.Length <= i + 2)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
ComparisonOperator c =
|
(ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]);
|
|
if (c != ComparisonOperator.NotEqualTo && c != ComparisonOperator.EqualTo)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
string m = tokens[i + 2];
|
|
// handle single-quoted filespecs (used to include
|
// spaces in filename patterns)
|
if (m.StartsWith("'") && m.EndsWith("'"))
|
{
|
// trim off leading and trailing single quotes and
|
// revert the control characters to spaces.
|
m = m.Substring(1, m.Length - 2)
|
.Replace("\u0006", " ");
|
}
|
|
// if (m.StartsWith("'"))
|
// m = m.Replace("\u0006", " ");
|
|
current = new NameCriterion
|
{
|
MatchingFileSpec = m,
|
Operator = c
|
};
|
i += 2;
|
stateStack.Push(ParseState.CriterionDone);
|
}
|
break;
|
|
#if !SILVERLIGHT
|
case "attrs":
|
case "attributes":
|
#endif
|
case "type":
|
{
|
if (tokens.Length <= i + 2)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
ComparisonOperator c =
|
(ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]);
|
|
if (c != ComparisonOperator.NotEqualTo && c != ComparisonOperator.EqualTo)
|
throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
|
|
#if SILVERLIGHT
|
current = (SelectionCriterion) new TypeCriterion
|
{
|
AttributeString = tokens[i + 2],
|
Operator = c
|
};
|
#else
|
current = (tok1 == "type")
|
? (SelectionCriterion) new TypeCriterion
|
{
|
AttributeString = tokens[i + 2],
|
Operator = c
|
}
|
: (SelectionCriterion) new AttributesCriterion
|
{
|
AttributeString = tokens[i + 2],
|
Operator = c
|
};
|
#endif
|
i += 2;
|
stateStack.Push(ParseState.CriterionDone);
|
}
|
break;
|
|
case "":
|
// NOP
|
stateStack.Push(ParseState.Whitespace);
|
break;
|
|
default:
|
throw new ArgumentException("'" + tokens[i] + "'");
|
}
|
|
state = stateStack.Peek();
|
if (state == ParseState.CriterionDone)
|
{
|
stateStack.Pop();
|
if (stateStack.Peek() == ParseState.ConjunctionPending)
|
{
|
while (stateStack.Peek() == ParseState.ConjunctionPending)
|
{
|
var cc = critStack.Pop() as CompoundCriterion;
|
cc.Right = current;
|
current = cc; // mark the parent as current (walk up the tree)
|
stateStack.Pop(); // the conjunction is no longer pending
|
|
state = stateStack.Pop();
|
if (state != ParseState.CriterionDone)
|
throw new ArgumentException("??");
|
}
|
}
|
else stateStack.Push(ParseState.CriterionDone); // not sure?
|
}
|
|
if (state == ParseState.Whitespace)
|
stateStack.Pop();
|
}
|
|
return current;
|
}
|
|
|
/// <summary>
|
/// Returns a string representation of the FileSelector object.
|
/// </summary>
|
/// <returns>The string representation of the boolean logic statement of the file
|
/// selection criteria for this instance. </returns>
|
public override String ToString()
|
{
|
return "FileSelector("+_Criterion.ToString()+")";
|
}
|
|
|
private bool Evaluate(string filename)
|
{
|
// dinoch - Thu, 11 Feb 2010 18:34
|
SelectorTrace("Evaluate({0})", filename);
|
bool result = _Criterion.Evaluate(filename);
|
return result;
|
}
|
|
[System.Diagnostics.Conditional("SelectorTrace")]
|
private void SelectorTrace(string format, params object[] args)
|
{
|
if (_Criterion != null && _Criterion.Verbose)
|
System.Console.WriteLine(format, args);
|
}
|
|
/// <summary>
|
/// Returns the names of the files in the specified directory
|
/// that fit the selection criteria specified in the FileSelector.
|
/// </summary>
|
///
|
/// <remarks>
|
/// This is equivalent to calling <see cref="SelectFiles(String, bool)"/>
|
/// with recurseDirectories = false.
|
/// </remarks>
|
///
|
/// <param name="directory">
|
/// The name of the directory over which to apply the FileSelector
|
/// criteria.
|
/// </param>
|
///
|
/// <returns>
|
/// A collection of strings containing fully-qualified pathnames of files
|
/// that match the criteria specified in the FileSelector instance.
|
/// </returns>
|
public System.Collections.Generic.ICollection<String> SelectFiles(String directory)
|
{
|
return SelectFiles(directory, false);
|
}
|
|
|
/// <summary>
|
/// Returns the names of the files in the specified directory that fit the
|
/// selection criteria specified in the FileSelector, optionally recursing
|
/// through subdirectories.
|
/// </summary>
|
///
|
/// <remarks>
|
/// This method applies the file selection criteria contained in the
|
/// FileSelector to the files contained in the given directory, and
|
/// returns the names of files that conform to the criteria.
|
/// </remarks>
|
///
|
/// <param name="directory">
|
/// The name of the directory over which to apply the FileSelector
|
/// criteria.
|
/// </param>
|
///
|
/// <param name="recurseDirectories">
|
/// Whether to recurse through subdirectories when applying the file
|
/// selection criteria.
|
/// </param>
|
///
|
/// <returns>
|
/// A collection of strings containing fully-qualified pathnames of files
|
/// that match the criteria specified in the FileSelector instance.
|
/// </returns>
|
public System.Collections.ObjectModel.ReadOnlyCollection<String>
|
SelectFiles(String directory,
|
bool recurseDirectories)
|
{
|
if (_Criterion == null)
|
throw new ArgumentException("SelectionCriteria has not been set");
|
|
var list = new List<String>();
|
try
|
{
|
if (Directory.Exists(directory))
|
{
|
String[] filenames = Directory.GetFiles(directory);
|
|
// add the files:
|
foreach (String filename in filenames)
|
{
|
if (Evaluate(filename))
|
list.Add(filename);
|
}
|
|
if (recurseDirectories)
|
{
|
// add the subdirectories:
|
String[] dirnames = Directory.GetDirectories(directory);
|
foreach (String dir in dirnames)
|
{
|
if (this.TraverseReparsePoints
|
#if !SILVERLIGHT
|
|| ((File.GetAttributes(dir) & FileAttributes.ReparsePoint) == 0)
|
#endif
|
)
|
{
|
// workitem 10191
|
if (Evaluate(dir)) list.Add(dir);
|
list.AddRange(this.SelectFiles(dir, recurseDirectories));
|
}
|
}
|
}
|
}
|
}
|
// can get System.UnauthorizedAccessException here
|
catch (System.UnauthorizedAccessException)
|
{
|
}
|
catch (System.IO.IOException)
|
{
|
}
|
|
return list.AsReadOnly();
|
}
|
}
|
|
|
|
/// <summary>
|
/// Summary description for EnumUtil.
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/// </summary>
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internal sealed class EnumUtil
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{
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private EnumUtil() { }
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/// <summary>
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/// Returns the value of the DescriptionAttribute if the specified Enum
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/// value has one. If not, returns the ToString() representation of the
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/// Enum value.
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/// </summary>
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/// <param name="value">The Enum to get the description for</param>
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/// <returns></returns>
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internal static string GetDescription(System.Enum value)
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{
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FieldInfo fi = value.GetType().GetField(value.ToString());
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var attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
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if (attributes.Length > 0)
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return attributes[0].Description;
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else
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return value.ToString();
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}
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/// <summary>
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/// Converts the string representation of the name or numeric value of one
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/// or more enumerated constants to an equivalent enumerated object.
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/// Note: use the DescriptionAttribute on enum values to enable this.
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/// </summary>
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/// <param name="enumType">The System.Type of the enumeration.</param>
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/// <param name="stringRepresentation">
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/// A string containing the name or value to convert.
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/// </param>
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/// <returns></returns>
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internal static object Parse(Type enumType, string stringRepresentation)
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{
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return Parse(enumType, stringRepresentation, false);
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}
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#if SILVERLIGHT
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public static System.Enum[] GetEnumValues(Type type)
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{
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if (!type.IsEnum)
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throw new ArgumentException("not an enum");
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return (
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from field in type.GetFields(BindingFlags.Public | BindingFlags.Static)
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where field.IsLiteral
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select (System.Enum)field.GetValue(null)
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).ToArray();
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}
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public static string[] GetEnumStrings<T>()
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{
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var type = typeof(T);
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if (!type.IsEnum)
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throw new ArgumentException("not an enum");
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return (
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from field in type.GetFields(BindingFlags.Public | BindingFlags.Static)
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where field.IsLiteral
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select field.Name
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).ToArray();
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}
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#endif
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/// <summary>
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/// Converts the string representation of the name or numeric value of one
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/// or more enumerated constants to an equivalent enumerated object. A
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/// parameter specified whether the operation is case-sensitive. Note:
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/// use the DescriptionAttribute on enum values to enable this.
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/// </summary>
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/// <param name="enumType">The System.Type of the enumeration.</param>
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/// <param name="stringRepresentation">
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/// A string containing the name or value to convert.
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/// </param>
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/// <param name="ignoreCase">
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/// Whether the operation is case-sensitive or not.</param>
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/// <returns></returns>
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internal static object Parse(Type enumType, string stringRepresentation, bool ignoreCase)
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{
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if (ignoreCase)
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stringRepresentation = stringRepresentation.ToLower();
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#if SILVERLIGHT
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foreach (System.Enum enumVal in GetEnumValues(enumType))
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#else
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foreach (System.Enum enumVal in System.Enum.GetValues(enumType))
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#endif
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{
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string description = GetDescription(enumVal);
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if (ignoreCase)
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description = description.ToLower();
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if (description == stringRepresentation)
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return enumVal;
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}
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return System.Enum.Parse(enumType, stringRepresentation, ignoreCase);
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}
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}
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#if DEMO
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public class DemonstrateFileSelector
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{
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private string _directory;
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private bool _recurse;
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private bool _traverse;
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private bool _verbose;
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private string _selectionCriteria;
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private FileSelector f;
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public DemonstrateFileSelector()
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{
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this._directory = ".";
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this._recurse = true;
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}
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public DemonstrateFileSelector(string[] args) : this()
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{
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for (int i = 0; i < args.Length; i++)
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{
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switch(args[i])
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{
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case"-?":
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Usage();
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Environment.Exit(0);
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break;
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case "-d":
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i++;
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if (args.Length <= i)
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throw new ArgumentException("-directory");
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this._directory = args[i];
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break;
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case "-norecurse":
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this._recurse = false;
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break;
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case "-j-":
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this._traverse = false;
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break;
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case "-j+":
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this._traverse = true;
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break;
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case "-v":
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this._verbose = true;
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break;
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default:
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if (this._selectionCriteria != null)
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throw new ArgumentException(args[i]);
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this._selectionCriteria = args[i];
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break;
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}
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if (this._selectionCriteria != null)
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this.f = new FileSelector(this._selectionCriteria);
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}
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}
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public static void Main(string[] args)
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{
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try
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{
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Console.WriteLine();
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new DemonstrateFileSelector(args).Run();
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}
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catch (Exception exc1)
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{
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Console.WriteLine("Exception: {0}", exc1.ToString());
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Usage();
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}
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}
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public void Run()
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{
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if (this.f == null)
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this.f = new FileSelector("name = *.jpg AND (size > 1000 OR atime < 2009-02-14-01:00:00)");
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this.f.TraverseReparsePoints = _traverse;
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this.f.Verbose = this._verbose;
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Console.WriteLine();
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Console.WriteLine(new String(':', 88));
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Console.WriteLine("Selecting files:\n" + this.f.ToString());
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var files = this.f.SelectFiles(this._directory, this._recurse);
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if (files.Count == 0)
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{
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Console.WriteLine("no files.");
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}
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else
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{
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Console.WriteLine("files: {0}", files.Count);
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foreach (string file in files)
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{
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Console.WriteLine(" " + file);
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}
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}
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}
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public static void Usage()
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{
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Console.WriteLine("FileSelector: select files based on selection criteria.\n");
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Console.WriteLine("Usage:\n FileSelector <selectionCriteria> [options]\n" +
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"\n" +
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" -d <dir> directory to select from (Default .)\n" +
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" -norecurse don't recurse into subdirs\n" +
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" -j- don't traverse junctions\n" +
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" -v verbose output\n");
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}
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}
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#endif
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}
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