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source: branches/2901_StaticSelectionMethods/HeuristicLab.ExtLibs/HeuristicLab.EPPlus/4.0.3/EPPlus-4.0.3/Packaging/DotNetZip/FileSelector.cs

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Last change on this file was 12074, checked in by sraggl, 10 years ago
#2341: Added EPPlus-4.0.3 to ExtLibs
File size: 62.7 KB

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1	//#define SelectorTrace
2
3	// FileSelector.cs
4	// ------------------------------------------------------------------
5	//
6	// Copyright (c) 2008-2011 Dino Chiesa.
7	// All rights reserved.
8	//
9	// This code module is part of DotNetZip, a zipfile class library.
10	//
11	// ------------------------------------------------------------------
12	//
13	// This code is licensed under the Microsoft Public License.
14	// See the file License.txt for the license details.
15	// More info on: http://dotnetzip.codeplex.com
16	//
17	// ------------------------------------------------------------------
18	//
19	// last saved: <2011-August-05 11:03:11>
20	//
21	// ------------------------------------------------------------------
22	//
23	// This module implements a "file selector" that finds files based on a
24	// set of inclusion criteria, including filename, size, file time, and
25	// potentially file attributes. The criteria are given in a string with
26	// a simple expression language. Examples:
27	//
28	// find all .txt files:
29	// name = *.txt
30	//
31	// shorthand for the above
32	// *.txt
33	//
34	// all files modified after January 1st, 2009
35	// mtime > 2009-01-01
36	//
37	// All .txt files modified after the first of the year
38	// name = *.txt AND mtime > 2009-01-01
39	//
40	// All .txt files modified after the first of the year, or any file with the archive bit set
41	// (name = *.txt AND mtime > 2009-01-01) or (attribtues = A)
42	//
43	// All .txt files or any file greater than 1mb in size
44	// (name = *.txt or size > 1mb)
45	//
46	// and so on.
47	// ------------------------------------------------------------------
48
49
50	using System;
51	using System.Globalization;
52	using System.IO;
53	using System.Text;
54	using System.Reflection;
55	using System.ComponentModel;
56	using System.Text.RegularExpressions;
57	using System.Collections.Generic;
58	#if SILVERLIGHT
59	using System.Linq;
60	#endif
61
62	namespace OfficeOpenXml.Packaging.Ionic
63	{
64
65	/// <summary>
66	/// Enumerates the options for a logical conjunction. This enum is intended for use
67	/// internally by the FileSelector class.
68	/// </summary>
69	internal enum LogicalConjunction
70	{
71	NONE,
72	AND,
73	OR,
74	XOR,
75	}
76
77	internal enum WhichTime
78	{
79	atime,
80	mtime,
81	ctime,
82	}
83
84
85	internal enum ComparisonOperator
86	{
87	[Description(">")]
88	GreaterThan,
89	[Description(">=")]
90	GreaterThanOrEqualTo,
91	[Description("<")]
92	LesserThan,
93	[Description("<=")]
94	LesserThanOrEqualTo,
95	[Description("=")]
96	EqualTo,
97	[Description("!=")]
98	NotEqualTo
99	}
100
101
102	internal abstract partial class SelectionCriterion
103	{
104	internal virtual bool Verbose
105	{
106	get;set;
107	}
108	internal abstract bool Evaluate(string filename);
109
110	[System.Diagnostics.Conditional("SelectorTrace")]
111	protected static void CriterionTrace(string format, params object[] args)
112	{
113	//System.Console.WriteLine(" " + format, args);
114	}
115	}
116
117
118	internal partial class SizeCriterion : SelectionCriterion
119	{
120	internal ComparisonOperator Operator;
121	internal Int64 Size;
122
123	public override String ToString()
124	{
125	StringBuilder sb = new StringBuilder();
126	sb.Append("size ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(Size.ToString());
127	return sb.ToString();
128	}
129
130	internal override bool Evaluate(string filename)
131	{
132	System.IO.FileInfo fi = new System.IO.FileInfo(filename);
133	CriterionTrace("SizeCriterion::Evaluate('{0}' [{1}])",
134	filename, this.ToString());
135	return _Evaluate(fi.Length);
136	}
137
138	private bool _Evaluate(Int64 Length)
139	{
140	bool result = false;
141	switch (Operator)
142	{
143	case ComparisonOperator.GreaterThanOrEqualTo:
144	result = Length >= Size;
145	break;
146	case ComparisonOperator.GreaterThan:
147	result = Length > Size;
148	break;
149	case ComparisonOperator.LesserThanOrEqualTo:
150	result = Length <= Size;
151	break;
152	case ComparisonOperator.LesserThan:
153	result = Length < Size;
154	break;
155	case ComparisonOperator.EqualTo:
156	result = Length == Size;
157	break;
158	case ComparisonOperator.NotEqualTo:
159	result = Length != Size;
160	break;
161	default:
162	throw new ArgumentException("Operator");
163	}
164	return result;
165	}
166
167	}
168
169
170
171	internal partial class TimeCriterion : SelectionCriterion
172	{
173	internal ComparisonOperator Operator;
174	internal WhichTime Which;
175	internal DateTime Time;
176
177	public override String ToString()
178	{
179	StringBuilder sb = new StringBuilder();
180	sb.Append(Which.ToString()).Append(" ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(Time.ToString("yyyy-MM-dd-HH:mm:ss"));
181	return sb.ToString();
182	}
183
184	internal override bool Evaluate(string filename)
185	{
186	DateTime x;
187	switch (Which)
188	{
189	case WhichTime.atime:
190	x = System.IO.File.GetLastAccessTime(filename).ToUniversalTime();
191	break;
192	case WhichTime.mtime:
193	x = System.IO.File.GetLastWriteTime(filename).ToUniversalTime();
194	break;
195	case WhichTime.ctime:
196	x = System.IO.File.GetCreationTime(filename).ToUniversalTime();
197	break;
198	default:
199	throw new ArgumentException("Operator");
200	}
201	CriterionTrace("TimeCriterion({0},{1})= {2}", filename, Which.ToString(), x);
202	return _Evaluate(x);
203	}
204
205
206	private bool _Evaluate(DateTime x)
207	{
208	bool result = false;
209	switch (Operator)
210	{
211	case ComparisonOperator.GreaterThanOrEqualTo:
212	result = (x >= Time);
213	break;
214	case ComparisonOperator.GreaterThan:
215	result = (x > Time);
216	break;
217	case ComparisonOperator.LesserThanOrEqualTo:
218	result = (x <= Time);
219	break;
220	case ComparisonOperator.LesserThan:
221	result = (x < Time);
222	break;
223	case ComparisonOperator.EqualTo:
224	result = (x == Time);
225	break;
226	case ComparisonOperator.NotEqualTo:
227	result = (x != Time);
228	break;
229	default:
230	throw new ArgumentException("Operator");
231	}
232
233	CriterionTrace("TimeCriterion: {0}", result);
234	return result;
235	}
236	}
237
238
239
240	internal partial class NameCriterion : SelectionCriterion
241	{
242	private Regex _re;
243	private String _regexString;
244	internal ComparisonOperator Operator;
245	private string _MatchingFileSpec;
246	internal virtual string MatchingFileSpec
247	{
248	set
249	{
250	// workitem 8245
251	if (Directory.Exists(value))
252	{
253	_MatchingFileSpec = ".\\" + value + "\\.";
254	}
255	else
256	{
257	_MatchingFileSpec = value;
258	}
259
260	_regexString = "^" +
261	Regex.Escape(_MatchingFileSpec)
262	.Replace(@"\\\\.\", @"\\([^\.]+\|.\.[^\\\.])")
263	.Replace(@"\.\", @"\.[^\\\.]")
264	.Replace(@"\", @".")
265	//.Replace(@"\", @"[^\\\.]") // ill-conceived
266	.Replace(@"\?", @"[^\\\.]")
267	+ "$";
268
269	CriterionTrace("NameCriterion regexString({0})", _regexString);
270
271	_re = new Regex(_regexString, RegexOptions.IgnoreCase);
272	}
273	}
274
275
276	public override String ToString()
277	{
278	StringBuilder sb = new StringBuilder();
279	sb.Append("name ").Append(EnumUtil.GetDescription(Operator))
280	.Append(" '")
281	.Append(_MatchingFileSpec)
282	.Append("'");
283	return sb.ToString();
284	}
285
286
287	internal override bool Evaluate(string filename)
288	{
289	CriterionTrace("NameCriterion::Evaluate('{0}' pattern[{1}])",
290	filename, _MatchingFileSpec);
291	return _Evaluate(filename);
292	}
293
294	private bool _Evaluate(string fullpath)
295	{
296	CriterionTrace("NameCriterion::Evaluate({0})", fullpath);
297	// No slash in the pattern implicitly means recurse, which means compare to
298	// filename only, not full path.
299	String f = (_MatchingFileSpec.IndexOf('\\') == -1)
300	? System.IO.Path.GetFileName(fullpath)
301	: fullpath; // compare to fullpath
302
303	bool result = _re.IsMatch(f);
304
305	if (Operator != ComparisonOperator.EqualTo)
306	result = !result;
307	return result;
308	}
309	}
310
311
312	internal partial class TypeCriterion : SelectionCriterion
313	{
314	private char ObjectType; // 'D' = Directory, 'F' = File
315	internal ComparisonOperator Operator;
316	internal string AttributeString
317	{
318	get
319	{
320	return ObjectType.ToString();
321	}
322	set
323	{
324	if (value.Length != 1 \|\|
325	(value[0]!='D' && value[0]!='F'))
326	throw new ArgumentException("Specify a single character: either D or F");
327	ObjectType = value[0];
328	}
329	}
330
331	public override String ToString()
332	{
333	StringBuilder sb = new StringBuilder();
334	sb.Append("type ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(AttributeString);
335	return sb.ToString();
336	}
337
338	internal override bool Evaluate(string filename)
339	{
340	CriterionTrace("TypeCriterion::Evaluate({0})", filename);
341
342	bool result = (ObjectType == 'D')
343	? Directory.Exists(filename)
344	: File.Exists(filename);
345
346	if (Operator != ComparisonOperator.EqualTo)
347	result = !result;
348	return result;
349	}
350	}
351
352
353	#if !SILVERLIGHT
354	internal partial class AttributesCriterion : SelectionCriterion
355	{
356	private FileAttributes _Attributes;
357	internal ComparisonOperator Operator;
358	internal string AttributeString
359	{
360	get
361	{
362	string result = "";
363	if ((_Attributes & FileAttributes.Hidden) != 0)
364	result += "H";
365	if ((_Attributes & FileAttributes.System) != 0)
366	result += "S";
367	if ((_Attributes & FileAttributes.ReadOnly) != 0)
368	result += "R";
369	if ((_Attributes & FileAttributes.Archive) != 0)
370	result += "A";
371	if ((_Attributes & FileAttributes.ReparsePoint) != 0)
372	result += "L";
373	if ((_Attributes & FileAttributes.NotContentIndexed) != 0)
374	result += "I";
375	return result;
376	}
377
378	set
379	{
380	_Attributes = FileAttributes.Normal;
381	foreach (char c in value.ToUpper(CultureInfo.InvariantCulture))
382	{
383	switch (c)
384	{
385	case 'H':
386	if ((_Attributes & FileAttributes.Hidden) != 0)
387	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
388	_Attributes \|= FileAttributes.Hidden;
389	break;
390
391	case 'R':
392	if ((_Attributes & FileAttributes.ReadOnly) != 0)
393	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
394	_Attributes \|= FileAttributes.ReadOnly;
395	break;
396
397	case 'S':
398	if ((_Attributes & FileAttributes.System) != 0)
399	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
400	_Attributes \|= FileAttributes.System;
401	break;
402
403	case 'A':
404	if ((_Attributes & FileAttributes.Archive) != 0)
405	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
406	_Attributes \|= FileAttributes.Archive;
407	break;
408
409	case 'I':
410	if ((_Attributes & FileAttributes.NotContentIndexed) != 0)
411	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
412	_Attributes \|= FileAttributes.NotContentIndexed;
413	break;
414
415	case 'L':
416	if ((_Attributes & FileAttributes.ReparsePoint) != 0)
417	throw new ArgumentException(String.Format("Repeated flag. ({0})", c), "value");
418	_Attributes \|= FileAttributes.ReparsePoint;
419	break;
420
421	default:
422	throw new ArgumentException(value);
423	}
424	}
425	}
426	}
427
428
429	public override String ToString()
430	{
431	StringBuilder sb = new StringBuilder();
432	sb.Append("attributes ").Append(EnumUtil.GetDescription(Operator)).Append(" ").Append(AttributeString);
433	return sb.ToString();
434	}
435
436	private bool _EvaluateOne(FileAttributes fileAttrs, FileAttributes criterionAttrs)
437	{
438	bool result = false;
439	if ((_Attributes & criterionAttrs) == criterionAttrs)
440	result = ((fileAttrs & criterionAttrs) == criterionAttrs);
441	else
442	result = true;
443	return result;
444	}
445
446
447
448	internal override bool Evaluate(string filename)
449	{
450	// workitem 10191
451	if (Directory.Exists(filename))
452	{
453	// Directories don't have file attributes, so the result
454	// of an evaluation is always NO. This gets negated if
455	// the operator is NotEqualTo.
456	return (Operator != ComparisonOperator.EqualTo);
457	}
458	#if NETCF
459	FileAttributes fileAttrs = NetCfFile.GetAttributes(filename);
460	#else
461	FileAttributes fileAttrs = System.IO.File.GetAttributes(filename);
462	#endif
463
464	return _Evaluate(fileAttrs);
465	}
466
467	private bool _Evaluate(FileAttributes fileAttrs)
468	{
469	bool result = _EvaluateOne(fileAttrs, FileAttributes.Hidden);
470	if (result)
471	result = _EvaluateOne(fileAttrs, FileAttributes.System);
472	if (result)
473	result = _EvaluateOne(fileAttrs, FileAttributes.ReadOnly);
474	if (result)
475	result = _EvaluateOne(fileAttrs, FileAttributes.Archive);
476	if (result)
477	result = _EvaluateOne(fileAttrs, FileAttributes.NotContentIndexed);
478	if (result)
479	result = _EvaluateOne(fileAttrs, FileAttributes.ReparsePoint);
480
481	if (Operator != ComparisonOperator.EqualTo)
482	result = !result;
483
484	return result;
485	}
486	}
487	#endif
488
489
490	internal partial class CompoundCriterion : SelectionCriterion
491	{
492	internal LogicalConjunction Conjunction;
493	internal SelectionCriterion Left;
494
495	private SelectionCriterion _Right;
496	internal SelectionCriterion Right
497	{
498	get { return _Right; }
499	set
500	{
501	_Right = value;
502	if (value == null)
503	Conjunction = LogicalConjunction.NONE;
504	else if (Conjunction == LogicalConjunction.NONE)
505	Conjunction = LogicalConjunction.AND;
506	}
507	}
508
509
510	internal override bool Evaluate(string filename)
511	{
512	bool result = Left.Evaluate(filename);
513	switch (Conjunction)
514	{
515	case LogicalConjunction.AND:
516	if (result)
517	result = Right.Evaluate(filename);
518	break;
519	case LogicalConjunction.OR:
520	if (!result)
521	result = Right.Evaluate(filename);
522	break;
523	case LogicalConjunction.XOR:
524	result ^= Right.Evaluate(filename);
525	break;
526	default:
527	throw new ArgumentException("Conjunction");
528	}
529	return result;
530	}
531
532
533	public override String ToString()
534	{
535	StringBuilder sb = new StringBuilder();
536	sb.Append("(")
537	.Append((Left != null) ? Left.ToString() : "null")
538	.Append(" ")
539	.Append(Conjunction.ToString())
540	.Append(" ")
541	.Append((Right != null) ? Right.ToString() : "null")
542	.Append(")");
543	return sb.ToString();
544	}
545	}
546
547
548
549	/// <summary>
550	/// FileSelector encapsulates logic that selects files from a source - a zip file
551	/// or the filesystem - based on a set of criteria. This class is used internally
552	/// by the DotNetZip library, in particular for the AddSelectedFiles() methods.
553	/// This class can also be used independently of the zip capability in DotNetZip.
554	/// </summary>
555	///
556	/// <remarks>
557	///
558	/// <para>
559	/// The FileSelector class is used internally by the ZipFile class for selecting
560	/// files for inclusion into the ZipFile, when the <see
561	/// cref="Ionic.Zip.ZipFile.AddSelectedFiles(String,String)"/> method, or one of
562	/// its overloads, is called. It's also used for the <see
563	/// cref="Ionic.Zip.ZipFile.ExtractSelectedEntries(String)"/> methods. Typically, an
564	/// application that creates or manipulates Zip archives will not directly
565	/// interact with the FileSelector class.
566	/// </para>
567	///
568	/// <para>
569	/// Some applications may wish to use the FileSelector class directly, to
570	/// select files from disk volumes based on a set of criteria, without creating or
571	/// querying Zip archives. The file selection criteria include: a pattern to
572	/// match the filename; the last modified, created, or last accessed time of the
573	/// file; the size of the file; and the attributes of the file.
574	/// </para>
575	///
576	/// <para>
577	/// Consult the documentation for <see cref="SelectionCriteria"/>
578	/// for more information on specifying the selection criteria.
579	/// </para>
580	///
581	/// </remarks>
582	internal partial class FileSelector
583	{
584	internal SelectionCriterion _Criterion;
585
586	#if NOTUSED
587	/// <summary>
588	/// The default constructor.
589	/// </summary>
590	/// <remarks>
591	/// Typically, applications won't use this constructor. Instead they'll
592	/// call the constructor that accepts a selectionCriteria string. If you
593	/// use this constructor, you'll want to set the SelectionCriteria
594	/// property on the instance before calling SelectFiles().
595	/// </remarks>
596	protected FileSelector() { }
597	#endif
598	/// <summary>
599	/// Constructor that allows the caller to specify file selection criteria.
600	/// </summary>
601	///
602	/// <remarks>
603	/// <para>
604	/// This constructor allows the caller to specify a set of criteria for
605	/// selection of files.
606	/// </para>
607	///
608	/// <para>
609	/// See <see cref="FileSelector.SelectionCriteria"/> for a description of
610	/// the syntax of the selectionCriteria string.
611	/// </para>
612	///
613	/// <para>
614	/// By default the FileSelector will traverse NTFS Reparse Points. To
615	/// change this, use <see cref="FileSelector(String,
616	/// bool)">FileSelector(String, bool)</see>.
617	/// </para>
618	/// </remarks>
619	///
620	/// <param name="selectionCriteria">The criteria for file selection.</param>
621	public FileSelector(String selectionCriteria)
622	: this(selectionCriteria, true)
623	{
624	}
625
626	/// <summary>
627	/// Constructor that allows the caller to specify file selection criteria.
628	/// </summary>
629	///
630	/// <remarks>
631	/// <para>
632	/// This constructor allows the caller to specify a set of criteria for
633	/// selection of files.
634	/// </para>
635	///
636	/// <para>
637	/// See <see cref="FileSelector.SelectionCriteria"/> for a description of
638	/// the syntax of the selectionCriteria string.
639	/// </para>
640	/// </remarks>
641	///
642	/// <param name="selectionCriteria">The criteria for file selection.</param>
643	/// <param name="traverseDirectoryReparsePoints">
644	/// whether to traverse NTFS reparse points (junctions).
645	/// </param>
646	public FileSelector(String selectionCriteria, bool traverseDirectoryReparsePoints)
647	{
648	if (!String.IsNullOrEmpty(selectionCriteria))
649	_Criterion = _ParseCriterion(selectionCriteria);
650	TraverseReparsePoints = traverseDirectoryReparsePoints;
651	}
652
653
654
655	/// <summary>
656	/// The string specifying which files to include when retrieving.
657	/// </summary>
658	/// <remarks>
659	///
660	/// <para>
661	/// Specify the criteria in statements of 3 elements: a noun, an operator,
662	/// and a value. Consider the string "name != *.doc" . The noun is
663	/// "name". The operator is "!=", implying "Not Equal". The value is
664	/// "*.doc". That criterion, in English, says "all files with a name that
665	/// does not end in the .doc extension."
666	/// </para>
667	///
668	/// <para>
669	/// Supported nouns include "name" (or "filename") for the filename;
670	/// "atime", "mtime", and "ctime" for last access time, last modfied time,
671	/// and created time of the file, respectively; "attributes" (or "attrs")
672	/// for the file attributes; "size" (or "length") for the file length
673	/// (uncompressed); and "type" for the type of object, either a file or a
674	/// directory. The "attributes", "type", and "name" nouns all support =
675	/// and != as operators. The "size", "atime", "mtime", and "ctime" nouns
676	/// support = and !=, and >, >=, <, <= as well. The times are
677	/// taken to be expressed in local time.
678	/// </para>
679	///
680	/// <para>
681	/// Specify values for the file attributes as a string with one or more of
682	/// the characters H,R,S,A,I,L in any order, implying file attributes of
683	/// Hidden, ReadOnly, System, Archive, NotContextIndexed, and ReparsePoint
684	/// (symbolic link) respectively.
685	/// </para>
686	///
687	/// <para>
688	/// To specify a time, use YYYY-MM-DD-HH:mm:ss or YYYY/MM/DD-HH:mm:ss as
689	/// the format. If you omit the HH:mm:ss portion, it is assumed to be
690	/// 00:00:00 (midnight).
691	/// </para>
692	///
693	/// <para>
694	/// The value for a size criterion is expressed in integer quantities of
695	/// bytes, kilobytes (use k or kb after the number), megabytes (m or mb),
696	/// or gigabytes (g or gb).
697	/// </para>
698	///
699	/// <para>
700	/// The value for a name is a pattern to match against the filename,
701	/// potentially including wildcards. The pattern follows CMD.exe glob
702	/// rules: * implies one or more of any character, while ? implies one
703	/// character. If the name pattern contains any slashes, it is matched to
704	/// the entire filename, including the path; otherwise, it is matched
705	/// against only the filename without the path. This means a pattern of
706	/// "\.*" matches all files one directory level deep, while a pattern of
707	/// "." matches all files in all directories.
708	/// </para>
709	///
710	/// <para>
711	/// To specify a name pattern that includes spaces, use single quotes
712	/// around the pattern. A pattern of "'* .'" will match all files that
713	/// have spaces in the filename. The full criteria string for that would
714	/// be "name = '* .'" .
715	/// </para>
716	///
717	/// <para>
718	/// The value for a type criterion is either F (implying a file) or D
719	/// (implying a directory).
720	/// </para>
721	///
722	/// <para>
723	/// Some examples:
724	/// </para>
725	///
726	/// <list type="table">
727	/// <listheader>
728	/// <term>criteria</term>
729	/// <description>Files retrieved</description>
730	/// </listheader>
731	///
732	/// <item>
733	/// <term>name != *.xls </term>
734	/// <description>any file with an extension that is not .xls
735	/// </description>
736	/// </item>
737	///
738	/// <item>
739	/// <term>name = *.mp3 </term>
740	/// <description>any file with a .mp3 extension.
741	/// </description>
742	/// </item>
743	///
744	/// <item>
745	/// <term>*.mp3</term>
746	/// <description>(same as above) any file with a .mp3 extension.
747	/// </description>
748	/// </item>
749	///
750	/// <item>
751	/// <term>attributes = A </term>
752	/// <description>all files whose attributes include the Archive bit.
753	/// </description>
754	/// </item>
755	///
756	/// <item>
757	/// <term>attributes != H </term>
758	/// <description>all files whose attributes do not include the Hidden bit.
759	/// </description>
760	/// </item>
761	///
762	/// <item>
763	/// <term>mtime > 2009-01-01</term>
764	/// <description>all files with a last modified time after January 1st, 2009.
765	/// </description>
766	/// </item>
767	///
768	/// <item>
769	/// <term>ctime > 2009/01/01-03:00:00</term>
770	/// <description>all files with a created time after 3am (local time),
771	/// on January 1st, 2009.
772	/// </description>
773	/// </item>
774	///
775	/// <item>
776	/// <term>size > 2gb</term>
777	/// <description>all files whose uncompressed size is greater than 2gb.
778	/// </description>
779	/// </item>
780	///
781	/// <item>
782	/// <term>type = D</term>
783	/// <description>all directories in the filesystem. </description>
784	/// </item>
785	///
786	/// </list>
787	///
788	/// <para>
789	/// You can combine criteria with the conjunctions AND, OR, and XOR. Using
790	/// a string like "name = *.txt AND size >= 100k" for the
791	/// selectionCriteria retrieves entries whose names end in .txt, and whose
792	/// uncompressed size is greater than or equal to 100 kilobytes.
793	/// </para>
794	///
795	/// <para>
796	/// For more complex combinations of criteria, you can use parenthesis to
797	/// group clauses in the boolean logic. Absent parenthesis, the
798	/// precedence of the criterion atoms is determined by order of
799	/// appearance. Unlike the C# language, the AND conjunction does not take
800	/// precendence over the logical OR. This is important only in strings
801	/// that contain 3 or more criterion atoms. In other words, "name = *.txt
802	/// and size > 1000 or attributes = H" implies "((name = *.txt AND size
803	/// > 1000) OR attributes = H)" while "attributes = H OR name = *.txt
804	/// and size > 1000" evaluates to "((attributes = H OR name = *.txt)
805	/// AND size > 1000)". When in doubt, use parenthesis.
806	/// </para>
807	///
808	/// <para>
809	/// Using time properties requires some extra care. If you want to
810	/// retrieve all entries that were last updated on 2009 February 14,
811	/// specify "mtime >= 2009-02-14 AND mtime < 2009-02-15". Read this
812	/// to say: all files updated after 12:00am on February 14th, until
813	/// 12:00am on February 15th. You can use the same bracketing approach to
814	/// specify any time period - a year, a month, a week, and so on.
815	/// </para>
816	///
817	/// <para>
818	/// The syntax allows one special case: if you provide a string with no
819	/// spaces, it is treated as a pattern to match for the filename.
820	/// Therefore a string like "*.xls" will be equivalent to specifying "name
821	/// = *.xls". This "shorthand" notation does not work with compound
822	/// criteria.
823	/// </para>
824	///
825	/// <para>
826	/// There is no logic in this class that insures that the inclusion
827	/// criteria are internally consistent. For example, it's possible to
828	/// specify criteria that says the file must have a size of less than 100
829	/// bytes, as well as a size that is greater than 1000 bytes. Obviously
830	/// no file will ever satisfy such criteria, but this class does not check
831	/// for or detect such inconsistencies.
832	/// </para>
833	///
834	/// </remarks>
835	///
836	/// <exception cref="System.Exception">
837	/// Thrown in the setter if the value has an invalid syntax.
838	/// </exception>
839	public String SelectionCriteria
840	{
841	get
842	{
843	if (_Criterion == null) return null;
844	return _Criterion.ToString();
845	}
846	set
847	{
848	if (value == null) _Criterion = null;
849	else if (value.Trim() == "") _Criterion = null;
850	else
851	_Criterion = _ParseCriterion(value);
852	}
853	}
854
855	/// <summary>
856	/// Indicates whether searches will traverse NTFS reparse points, like Junctions.
857	/// </summary>
858	public bool TraverseReparsePoints
859	{
860	get; set;
861	}
862
863
864	private enum ParseState
865	{
866	Start,
867	OpenParen,
868	CriterionDone,
869	ConjunctionPending,
870	Whitespace,
871	}
872
873
874	private static class RegexAssertions
875	{
876	public static readonly String PrecededByOddNumberOfSingleQuotes = "(?<=(?:[^']'[^']')'[^'])";
877	public static readonly String FollowedByOddNumberOfSingleQuotesAndLineEnd = "(?=[^']'(?:[^']'[^']')[^']*$)";
878
879	public static readonly String PrecededByEvenNumberOfSingleQuotes = "(?<=(?:[^']'[^']')[^'])";
880	public static readonly String FollowedByEvenNumberOfSingleQuotesAndLineEnd = "(?=(?:[^']'[^']')[^']$)";
881	}
882
883
884	private static string NormalizeCriteriaExpression(string source)
885	{
886	// The goal here is to normalize the criterion expression. At output, in
887	// the transformed criterion string, every significant syntactic element
888	// - a property element, grouping paren for the boolean logic, operator
889	// ( = < > != ), conjunction, or property value - will be separated from
890	// its neighbors by at least one space. Thus,
891	//
892	// before after
893	// -------------------------------------------------------------------
894	// name=.txt name = .txt
895	// (size>100)AND(name=.txt) ( size > 100 ) AND ( name = .txt )
896	//
897	// This is relatively straightforward using regular expression
898	// replacement. This method applies a distinct regex pattern and
899	// corresponding replacement string for each one of a number of cases:
900	// an open paren followed by a word; a word followed by a close-paren; a
901	// pair of open parens; a close paren followed by a word (which should
902	// then be followed by an open paren). And so on. These patterns and
903	// replacements are all stored in prPairs. By applying each of these
904	// regex replacements in turn, we get the transformed string. Easy.
905	//
906	// The resulting "normalized" criterion string, is then used as the
907	// subject that gets parsed, by splitting the string into tokens that
908	// are separated by spaces. Here, there's a twist. The spaces within
909	// single-quote delimiters do not delimit distinct tokens. So, this
910	// normalization method temporarily replaces those spaces with
911	// ASCII 6 (0x06), a control character which is not a legal
912	// character in a filename. The parsing logic that happens later will
913	// revert that change, restoring the original value of the filename
914	// specification.
915	//
916	// To illustrate, for a "before" string of [(size>100)AND(name='Name
917	// (with Parens).txt')] , the "after" string is [( size > 100 ) AND
918	// ( name = 'Name\u0006(with\u0006Parens).txt' )].
919	//
920
921	string[][] prPairs =
922	{
923	// A. opening double parens - insert a space between them
924	new string[] { @"([^']*)\(\(([^']+)", "$1( ($2" },
925
926	// B. closing double parens - insert a space between
927	new string[] { @"(.)\)\)", "$1) )" },
928
929	// C. single open paren with a following word - insert a space between
930	new string[] { @"\((\S)", "( $1" },
931
932	// D. single close paren with a preceding word - insert a space between the two
933	new string[] { @"(\S)\)", "$1 )" },
934
935	// E. close paren at line start?, insert a space before the close paren
936	// this seems like a degenerate case. I don't recall why it's here.
937	new string[] { @"^\)", " )" },
938
939	// F. a word (likely a conjunction) followed by an open paren - insert a space between
940	new string[] { @"(\S)\(", "$1 (" },
941
942	// G. single close paren followed by word - insert a paren after close paren
943	new string[] { @"\)(\S)", ") $1" },
944
945	// H. insert space between = and a following single quote
946	//new string[] { @"(=\|!=)('[^']*')", "$1 $2" },
947	new string[] { @"(=)('[^']*')", "$1 $2" },
948
949	// I. insert space between property names and the following operator
950	//new string[] { @"([^ ])([><(?:!=)=])", "$1 $2" },
951	new string[] { @"([^ !><])(>\|<\|!=\|=)", "$1 $2" },
952
953	// J. insert spaces between operators and the following values
954	//new string[] { @"([><(?:!=)=])([^ ])", "$1 $2" },
955	new string[] { @"(>\|<\|!=\|=)([^ =])", "$1 $2" },
956
957	// K. replace fwd slash with backslash
958	new string[] { @"/", "\\" },
959	};
960
961	string interim = source;
962
963	for (int i=0; i < prPairs.Length; i++)
964	{
965	//char caseIdx = (char)('A' + i);
966	string pattern = RegexAssertions.PrecededByEvenNumberOfSingleQuotes +
967	prPairs[i][0] +
968	RegexAssertions.FollowedByEvenNumberOfSingleQuotesAndLineEnd;
969
970	interim = Regex.Replace(interim, pattern, prPairs[i][1]);
971	}
972
973	// match a fwd slash, followed by an odd number of single quotes.
974	// This matches fwd slashes only inside a pair of single quote delimiters,
975	// eg, a filename. This must be done as well as the case above, to handle
976	// filenames specified inside quotes as well as filenames without quotes.
977	var regexPattern = @"/" +
978	RegexAssertions.FollowedByOddNumberOfSingleQuotesAndLineEnd;
979	// replace with backslash
980	interim = Regex.Replace(interim, regexPattern, "\\");
981
982	// match a space, followed by an odd number of single quotes.
983	// This matches spaces only inside a pair of single quote delimiters.
984	regexPattern = " " +
985	RegexAssertions.FollowedByOddNumberOfSingleQuotesAndLineEnd;
986
987	// Replace all spaces that appear inside single quotes, with
988	// ascii 6. This allows a split on spaces to get tokens in
989	// the expression. The split will not split any filename or
990	// wildcard that appears within single quotes. After tokenizing, we
991	// need to replace ascii 6 with ascii 32 to revert the
992	// spaces within quotes.
993	return Regex.Replace(interim, regexPattern, "\u0006");
994	}
995
996
997	private static SelectionCriterion _ParseCriterion(String s)
998	{
999	if (s == null) return null;
1000
1001	// inject spaces after open paren and before close paren, etc
1002	s = NormalizeCriteriaExpression(s);
1003
1004	// no spaces in the criteria is shorthand for filename glob
1005	if (s.IndexOf(" ") == -1)
1006	s = "name = " + s;
1007
1008	// split the expression into tokens
1009	string[] tokens = s.Trim().Split(' ', '\t');
1010
1011	if (tokens.Length < 3) throw new ArgumentException(s);
1012
1013	SelectionCriterion current = null;
1014
1015	LogicalConjunction pendingConjunction = LogicalConjunction.NONE;
1016
1017	ParseState state;
1018	var stateStack = new System.Collections.Generic.Stack<ParseState>();
1019	var critStack = new System.Collections.Generic.Stack<SelectionCriterion>();
1020	stateStack.Push(ParseState.Start);
1021
1022	for (int i = 0; i < tokens.Length; i++)
1023	{
1024	string tok1 = tokens[i].ToLower(CultureInfo.InvariantCulture);
1025	switch (tok1)
1026	{
1027	case "and":
1028	case "xor":
1029	case "or":
1030	state = stateStack.Peek();
1031	if (state != ParseState.CriterionDone)
1032	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1033
1034	if (tokens.Length <= i + 3)
1035	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1036
1037	pendingConjunction = (LogicalConjunction)Enum.Parse(typeof(LogicalConjunction), tokens[i].ToUpper(CultureInfo.InvariantCulture), true);
1038	current = new CompoundCriterion { Left = current, Right = null, Conjunction = pendingConjunction };
1039	stateStack.Push(state);
1040	stateStack.Push(ParseState.ConjunctionPending);
1041	critStack.Push(current);
1042	break;
1043
1044	case "(":
1045	state = stateStack.Peek();
1046	if (state != ParseState.Start && state != ParseState.ConjunctionPending && state != ParseState.OpenParen)
1047	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1048
1049	if (tokens.Length <= i + 4)
1050	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1051
1052	stateStack.Push(ParseState.OpenParen);
1053	break;
1054
1055	case ")":
1056	state = stateStack.Pop();
1057	if (stateStack.Peek() != ParseState.OpenParen)
1058	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1059
1060	stateStack.Pop();
1061	stateStack.Push(ParseState.CriterionDone);
1062	break;
1063
1064	case "atime":
1065	case "ctime":
1066	case "mtime":
1067	if (tokens.Length <= i + 2)
1068	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1069
1070	DateTime t;
1071	try
1072	{
1073	t = DateTime.ParseExact(tokens[i + 2], "yyyy-MM-dd-HH:mm:ss", null);
1074	}
1075	catch (FormatException)
1076	{
1077	try
1078	{
1079	t = DateTime.ParseExact(tokens[i + 2], "yyyy/MM/dd-HH:mm:ss", null);
1080	}
1081	catch (FormatException)
1082	{
1083	try
1084	{
1085	t = DateTime.ParseExact(tokens[i + 2], "yyyy/MM/dd", null);
1086	}
1087	catch (FormatException)
1088	{
1089	try
1090	{
1091	t = DateTime.ParseExact(tokens[i + 2], "MM/dd/yyyy", null);
1092	}
1093	catch (FormatException)
1094	{
1095	t = DateTime.ParseExact(tokens[i + 2], "yyyy-MM-dd", null);
1096	}
1097	}
1098	}
1099	}
1100	t= DateTime.SpecifyKind(t, DateTimeKind.Local).ToUniversalTime();
1101	current = new TimeCriterion
1102	{
1103	Which = (WhichTime)Enum.Parse(typeof(WhichTime), tokens[i], true),
1104	Operator = (ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]),
1105	Time = t
1106	};
1107	i += 2;
1108	stateStack.Push(ParseState.CriterionDone);
1109	break;
1110
1111
1112	case "length":
1113	case "size":
1114	if (tokens.Length <= i + 2)
1115	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1116
1117	Int64 sz = 0;
1118	string v = tokens[i + 2];
1119	if (v.EndsWith("K", StringComparison.InvariantCultureIgnoreCase))
1120	sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024;
1121	else if (v.EndsWith("KB", StringComparison.InvariantCultureIgnoreCase))
1122	sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024;
1123	else if (v.EndsWith("M", StringComparison.InvariantCultureIgnoreCase))
1124	sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024 * 1024;
1125	else if (v.EndsWith("MB", StringComparison.InvariantCultureIgnoreCase))
1126	sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024 * 1024;
1127	else if (v.EndsWith("G", StringComparison.InvariantCultureIgnoreCase))
1128	sz = Int64.Parse(v.Substring(0, v.Length - 1)) * 1024 * 1024 * 1024;
1129	else if (v.EndsWith("GB", StringComparison.InvariantCultureIgnoreCase))
1130	sz = Int64.Parse(v.Substring(0, v.Length - 2)) * 1024 * 1024 * 1024;
1131	else sz = Int64.Parse(tokens[i + 2]);
1132
1133	current = new SizeCriterion
1134	{
1135	Size = sz,
1136	Operator = (ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1])
1137	};
1138	i += 2;
1139	stateStack.Push(ParseState.CriterionDone);
1140	break;
1141
1142	case "filename":
1143	case "name":
1144	{
1145	if (tokens.Length <= i + 2)
1146	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1147
1148	ComparisonOperator c =
1149	(ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]);
1150
1151	if (c != ComparisonOperator.NotEqualTo && c != ComparisonOperator.EqualTo)
1152	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1153
1154	string m = tokens[i + 2];
1155
1156	// handle single-quoted filespecs (used to include
1157	// spaces in filename patterns)
1158	if (m.StartsWith("'") && m.EndsWith("'"))
1159	{
1160	// trim off leading and trailing single quotes and
1161	// revert the control characters to spaces.
1162	m = m.Substring(1, m.Length - 2)
1163	.Replace("\u0006", " ");
1164	}
1165
1166	// if (m.StartsWith("'"))
1167	// m = m.Replace("\u0006", " ");
1168
1169	current = new NameCriterion
1170	{
1171	MatchingFileSpec = m,
1172	Operator = c
1173	};
1174	i += 2;
1175	stateStack.Push(ParseState.CriterionDone);
1176	}
1177	break;
1178
1179	#if !SILVERLIGHT
1180	case "attrs":
1181	case "attributes":
1182	#endif
1183	case "type":
1184	{
1185	if (tokens.Length <= i + 2)
1186	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1187
1188	ComparisonOperator c =
1189	(ComparisonOperator)EnumUtil.Parse(typeof(ComparisonOperator), tokens[i + 1]);
1190
1191	if (c != ComparisonOperator.NotEqualTo && c != ComparisonOperator.EqualTo)
1192	throw new ArgumentException(String.Join(" ", tokens, i, tokens.Length - i));
1193
1194	#if SILVERLIGHT
1195	current = (SelectionCriterion) new TypeCriterion
1196	{
1197	AttributeString = tokens[i + 2],
1198	Operator = c
1199	};
1200	#else
1201	current = (tok1 == "type")
1202	? (SelectionCriterion) new TypeCriterion
1203	{
1204	AttributeString = tokens[i + 2],
1205	Operator = c
1206	}
1207	: (SelectionCriterion) new AttributesCriterion
1208	{
1209	AttributeString = tokens[i + 2],
1210	Operator = c
1211	};
1212	#endif
1213	i += 2;
1214	stateStack.Push(ParseState.CriterionDone);
1215	}
1216	break;
1217
1218	case "":
1219	// NOP
1220	stateStack.Push(ParseState.Whitespace);
1221	break;
1222
1223	default:
1224	throw new ArgumentException("'" + tokens[i] + "'");
1225	}
1226
1227	state = stateStack.Peek();
1228	if (state == ParseState.CriterionDone)
1229	{
1230	stateStack.Pop();
1231	if (stateStack.Peek() == ParseState.ConjunctionPending)
1232	{
1233	while (stateStack.Peek() == ParseState.ConjunctionPending)
1234	{
1235	var cc = critStack.Pop() as CompoundCriterion;
1236	cc.Right = current;
1237	current = cc; // mark the parent as current (walk up the tree)
1238	stateStack.Pop(); // the conjunction is no longer pending
1239
1240	state = stateStack.Pop();
1241	if (state != ParseState.CriterionDone)
1242	throw new ArgumentException("??");
1243	}
1244	}
1245	else stateStack.Push(ParseState.CriterionDone); // not sure?
1246	}
1247
1248	if (state == ParseState.Whitespace)
1249	stateStack.Pop();
1250	}
1251
1252	return current;
1253	}
1254
1255
1256	/// <summary>
1257	/// Returns a string representation of the FileSelector object.
1258	/// </summary>
1259	/// <returns>The string representation of the boolean logic statement of the file
1260	/// selection criteria for this instance. </returns>
1261	public override String ToString()
1262	{
1263	return "FileSelector("+_Criterion.ToString()+")";
1264	}
1265
1266
1267	private bool Evaluate(string filename)
1268	{
1269	// dinoch - Thu, 11 Feb 2010 18:34
1270	SelectorTrace("Evaluate({0})", filename);
1271	bool result = _Criterion.Evaluate(filename);
1272	return result;
1273	}
1274
1275	[System.Diagnostics.Conditional("SelectorTrace")]
1276	private void SelectorTrace(string format, params object[] args)
1277	{
1278	if (_Criterion != null && _Criterion.Verbose)
1279	System.Console.WriteLine(format, args);
1280	}
1281
1282	/// <summary>
1283	/// Returns the names of the files in the specified directory
1284	/// that fit the selection criteria specified in the FileSelector.
1285	/// </summary>
1286	///
1287	/// <remarks>
1288	/// This is equivalent to calling <see cref="SelectFiles(String, bool)"/>
1289	/// with recurseDirectories = false.
1290	/// </remarks>
1291	///
1292	/// <param name="directory">
1293	/// The name of the directory over which to apply the FileSelector
1294	/// criteria.
1295	/// </param>
1296	///
1297	/// <returns>
1298	/// A collection of strings containing fully-qualified pathnames of files
1299	/// that match the criteria specified in the FileSelector instance.
1300	/// </returns>
1301	public System.Collections.Generic.ICollection<String> SelectFiles(String directory)
1302	{
1303	return SelectFiles(directory, false);
1304	}
1305
1306
1307	/// <summary>
1308	/// Returns the names of the files in the specified directory that fit the
1309	/// selection criteria specified in the FileSelector, optionally recursing
1310	/// through subdirectories.
1311	/// </summary>
1312	///
1313	/// <remarks>
1314	/// This method applies the file selection criteria contained in the
1315	/// FileSelector to the files contained in the given directory, and
1316	/// returns the names of files that conform to the criteria.
1317	/// </remarks>
1318	///
1319	/// <param name="directory">
1320	/// The name of the directory over which to apply the FileSelector
1321	/// criteria.
1322	/// </param>
1323	///
1324	/// <param name="recurseDirectories">
1325	/// Whether to recurse through subdirectories when applying the file
1326	/// selection criteria.
1327	/// </param>
1328	///
1329	/// <returns>
1330	/// A collection of strings containing fully-qualified pathnames of files
1331	/// that match the criteria specified in the FileSelector instance.
1332	/// </returns>
1333	public System.Collections.ObjectModel.ReadOnlyCollection<String>
1334	SelectFiles(String directory,
1335	bool recurseDirectories)
1336	{
1337	if (_Criterion == null)
1338	throw new ArgumentException("SelectionCriteria has not been set");
1339
1340	var list = new List<String>();
1341	try
1342	{
1343	if (Directory.Exists(directory))
1344	{
1345	String[] filenames = Directory.GetFiles(directory);
1346
1347	// add the files:
1348	foreach (String filename in filenames)
1349	{
1350	if (Evaluate(filename))
1351	list.Add(filename);
1352	}
1353
1354	if (recurseDirectories)
1355	{
1356	// add the subdirectories:
1357	String[] dirnames = Directory.GetDirectories(directory);
1358	foreach (String dir in dirnames)
1359	{
1360	if (this.TraverseReparsePoints
1361	#if !SILVERLIGHT
1362	\|\| ((File.GetAttributes(dir) & FileAttributes.ReparsePoint) == 0)
1363	#endif
1364	)
1365	{
1366	// workitem 10191
1367	if (Evaluate(dir)) list.Add(dir);
1368	list.AddRange(this.SelectFiles(dir, recurseDirectories));
1369	}
1370	}
1371	}
1372	}
1373	}
1374	// can get System.UnauthorizedAccessException here
1375	catch (System.UnauthorizedAccessException)
1376	{
1377	}
1378	catch (System.IO.IOException)
1379	{
1380	}
1381
1382	return list.AsReadOnly();
1383	}
1384	}
1385
1386
1387
1388	/// <summary>
1389	/// Summary description for EnumUtil.
1390	/// </summary>
1391	internal sealed class EnumUtil
1392	{
1393	private EnumUtil() { }
1394	/// <summary>
1395	/// Returns the value of the DescriptionAttribute if the specified Enum
1396	/// value has one. If not, returns the ToString() representation of the
1397	/// Enum value.
1398	/// </summary>
1399	/// <param name="value">The Enum to get the description for</param>
1400	/// <returns></returns>
1401	internal static string GetDescription(System.Enum value)
1402	{
1403	FieldInfo fi = value.GetType().GetField(value.ToString());
1404	var attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
1405	if (attributes.Length > 0)
1406	return attributes[0].Description;
1407	else
1408	return value.ToString();
1409	}
1410
1411	/// <summary>
1412	/// Converts the string representation of the name or numeric value of one
1413	/// or more enumerated constants to an equivalent enumerated object.
1414	/// Note: use the DescriptionAttribute on enum values to enable this.
1415	/// </summary>
1416	/// <param name="enumType">The System.Type of the enumeration.</param>
1417	/// <param name="stringRepresentation">
1418	/// A string containing the name or value to convert.
1419	/// </param>
1420	/// <returns></returns>
1421	internal static object Parse(Type enumType, string stringRepresentation)
1422	{
1423	return Parse(enumType, stringRepresentation, false);
1424	}
1425
1426
1427	#if SILVERLIGHT
1428	public static System.Enum[] GetEnumValues(Type type)
1429	{
1430	if (!type.IsEnum)
1431	throw new ArgumentException("not an enum");
1432
1433	return (
1434	from field in type.GetFields(BindingFlags.Public \| BindingFlags.Static)
1435	where field.IsLiteral
1436	select (System.Enum)field.GetValue(null)
1437	).ToArray();
1438	}
1439
1440	public static string[] GetEnumStrings<T>()
1441	{
1442	var type = typeof(T);
1443	if (!type.IsEnum)
1444	throw new ArgumentException("not an enum");
1445
1446	return (
1447	from field in type.GetFields(BindingFlags.Public \| BindingFlags.Static)
1448	where field.IsLiteral
1449	select field.Name
1450	).ToArray();
1451	}
1452	#endif
1453
1454	/// <summary>
1455	/// Converts the string representation of the name or numeric value of one
1456	/// or more enumerated constants to an equivalent enumerated object. A
1457	/// parameter specified whether the operation is case-sensitive. Note:
1458	/// use the DescriptionAttribute on enum values to enable this.
1459	/// </summary>
1460	/// <param name="enumType">The System.Type of the enumeration.</param>
1461	/// <param name="stringRepresentation">
1462	/// A string containing the name or value to convert.
1463	/// </param>
1464	/// <param name="ignoreCase">
1465	/// Whether the operation is case-sensitive or not.</param>
1466	/// <returns></returns>
1467	internal static object Parse(Type enumType, string stringRepresentation, bool ignoreCase)
1468	{
1469	if (ignoreCase)
1470	stringRepresentation = stringRepresentation.ToLower(CultureInfo.InvariantCulture);
1471
1472	#if SILVERLIGHT
1473	foreach (System.Enum enumVal in GetEnumValues(enumType))
1474	#else
1475	foreach (System.Enum enumVal in System.Enum.GetValues(enumType))
1476	#endif
1477	{
1478	string description = GetDescription(enumVal);
1479	if (ignoreCase)
1480	description = description.ToLower(CultureInfo.InvariantCulture);
1481	if (description == stringRepresentation)
1482	return enumVal;
1483	}
1484
1485	return System.Enum.Parse(enumType, stringRepresentation, ignoreCase);
1486	}
1487	}
1488
1489
1490	#if DEMO
1491	internal class DemonstrateFileSelector
1492	{
1493	private string _directory;
1494	private bool _recurse;
1495	private bool _traverse;
1496	private bool _verbose;
1497	private string _selectionCriteria;
1498	private FileSelector f;
1499
1500	public DemonstrateFileSelector()
1501	{
1502	this._directory = ".";
1503	this._recurse = true;
1504	}
1505
1506	public DemonstrateFileSelector(string[] args) : this()
1507	{
1508	for (int i = 0; i < args.Length; i++)
1509	{
1510	switch(args[i])
1511	{
1512	case"-?":
1513	Usage();
1514	Environment.Exit(0);
1515	break;
1516	case "-d":
1517	i++;
1518	if (args.Length <= i)
1519	throw new ArgumentException("-directory");
1520	this._directory = args[i];
1521	break;
1522	case "-norecurse":
1523	this._recurse = false;
1524	break;
1525
1526	case "-j-":
1527	this._traverse = false;
1528	break;
1529
1530	case "-j+":
1531	this._traverse = true;
1532	break;
1533
1534	case "-v":
1535	this._verbose = true;
1536	break;
1537
1538	default:
1539	if (this._selectionCriteria != null)
1540	throw new ArgumentException(args[i]);
1541	this._selectionCriteria = args[i];
1542	break;
1543	}
1544
1545	if (this._selectionCriteria != null)
1546	this.f = new FileSelector(this._selectionCriteria);
1547	}
1548	}
1549
1550
1551	public static void Main(string[] args)
1552	{
1553	try
1554	{
1555	Console.WriteLine();
1556	new DemonstrateFileSelector(args).Run();
1557	}
1558	catch (Exception exc1)
1559	{
1560	Console.WriteLine("Exception: {0}", exc1.ToString());
1561	Usage();
1562	}
1563	}
1564
1565
1566	public void Run()
1567	{
1568	if (this.f == null)
1569	this.f = new FileSelector("name = *.jpg AND (size > 1000 OR atime < 2009-02-14-01:00:00)");
1570
1571	this.f.TraverseReparsePoints = _traverse;
1572	this.f.Verbose = this._verbose;
1573	Console.WriteLine();
1574	Console.WriteLine(new String(':', 88));
1575	Console.WriteLine("Selecting files:\n" + this.f.ToString());
1576	var files = this.f.SelectFiles(this._directory, this._recurse);
1577	if (files.Count == 0)
1578	{
1579	Console.WriteLine("no files.");
1580	}
1581	else
1582	{
1583	Console.WriteLine("files: {0}", files.Count);
1584	foreach (string file in files)
1585	{
1586	Console.WriteLine(" " + file);
1587	}
1588	}
1589	}
1590
1591	public static void Usage()
1592	{
1593	Console.WriteLine("FileSelector: select files based on selection criteria.\n");
1594	Console.WriteLine("Usage:\n FileSelector <selectionCriteria> [options]\n" +
1595	"\n" +
1596	" -d <dir> directory to select from (Default .)\n" +
1597	" -norecurse don't recurse into subdirs\n" +
1598	" -j- don't traverse junctions\n" +
1599	" -v verbose output\n");
1600	}
1601	}
1602
1603	#endif
1604
1605
1606
1607	}
1608
1609

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