7 * Written by Keith Marshall <keithmarshall@users.sourceforge.net>
8 * Copyright (C) 2009, 2010, MinGW Project
11 * Public interface for the package directory management routines;
12 * declares the XML data structures, and their associated class APIs,
13 * which are used to describe packages and their interdependencies.
16 * This is free software. Permission is granted to copy, modify and
17 * redistribute this software, under the provisions of the GNU General
18 * Public License, Version 3, (or, at your option, any later version),
19 * as published by the Free Software Foundation; see the file COPYING
20 * for licensing details.
22 * Note, in particular, that this software is provided "as is", in the
23 * hope that it may prove useful, but WITHOUT WARRANTY OF ANY KIND; not
24 * even an implied WARRANTY OF MERCHANTABILITY, nor of FITNESS FOR ANY
25 * PARTICULAR PURPOSE. Under no circumstances will the author, or the
26 * MinGW Project, accept liability for any damages, however caused,
27 * arising from the use of this software.
37 # define EXTERN_C extern "C"
43 /* Adopt sensible defaults for matching subsystem and file names...
47 * The MS-Windows file system is intrinsically case insensitive,
48 * so we prefer to match both subsystem and file names in a case
49 * insensitive manner...
51 # ifndef CASE_INSENSITIVE_SUBSYSTEMS
52 # define CASE_INSENSITIVE_SUBSYSTEMS 1
54 # ifndef CASE_INSENSITIVE_FILESYSTEM
55 # define CASE_INSENSITIVE_FILESYSTEM 1
58 * The preferred name for MS-Windows' case insensitive string
59 * matching function, equivalent to POSIX strcasecmp().
61 # define strcasecmp stricmp
63 /* On other systems, we prefer to adopt case sensitive matching
64 * strategies for subsystem and file names.
66 # ifndef CASE_INSENSITIVE_SUBSYSTEMS
67 # define CASE_INSENSITIVE_SUBSYSTEMS 0
69 # ifndef CASE_INSENSITIVE_FILESYSTEM
70 # define CASE_INSENSITIVE_FILESYSTEM 0
74 class pkgXmlNode : public TiXmlElement
76 /* A minimal emulation of the wxXmlNode class, founded on
77 * the tinyxml implementation of the TiXmlElement class, and
78 * subsequently extended by application specific features.
83 inline pkgXmlNode( const char* name ):TiXmlElement( name ){}
84 inline pkgXmlNode( const pkgXmlNode& src ):TiXmlElement( src ){}
88 * Note that tinyxml is generally careless about checking for
89 * possible dereferencing of NULL pointers; thus, many of these
90 * wrappers include appropriate checks, to prevent this.
92 inline const char* GetName()
94 /* Retrieve the identifying name of the XML tag;
95 * tinyxml calls this the element "value"...
97 return this ? Value() : NULL;
99 inline pkgXmlNode* GetParent()
101 /* wxXmlNode provides this equivalant of tinyxml's
104 return this ? (pkgXmlNode*)(Parent()) : NULL;
106 inline pkgXmlNode* GetChildren()
108 /* wxXmlNode provides only this one method to access
109 * the children of an element; it is equivalent to the
110 * FirstChild() method in tinyxml's arsenal.
112 return this ? (pkgXmlNode*)(FirstChild()) : NULL;
114 inline pkgXmlNode* GetNext()
116 /* This is wxXmlNode's method for visiting other children
117 * of an element, after the first found by GetChildren();
118 * it is equivalent to tinyxml's NextSibling().
120 return this ? (pkgXmlNode*)(NextSibling()) : NULL;
122 inline const char* GetPropVal( const char* name, const char* subst )
124 /* tinyxml has no direct equivalent for this wxXmlNode method,
125 * (which substitutes default "subst" text for an omitted property),
126 * but it may be trivially emulated, using the Attribute() method.
128 const char* retval = this ? Attribute( name ) : subst;
129 return retval ? retval : subst;
131 inline pkgXmlNode* AddChild( TiXmlNode *child )
133 /* This is wxXmlNode's method for adding a child node, it is
134 * equivalent to tinyxml's LinkEndChild() method.
136 return this ? (pkgXmlNode*)(LinkEndChild( child )) : NULL;
138 inline bool DeleteChild( pkgXmlNode *child )
140 /* Both TiXmlNode and wxXmlNode have RemoveChild methods, but the
141 * implementations are semantically different; for tinyxml, we may
142 * simply use the RemoveChild method here, where for wxXmlNode, we
143 * would use RemoveChild followed by `delete child'.
145 return this ? RemoveChild( child ) : false;
148 /* Additional methods specific to the application.
150 inline pkgXmlNode *GetDocumentRoot()
152 /* Convenience method to retrieve a pointer to the document root.
154 return this ? (pkgXmlNode*)(GetDocument()->RootElement()) : NULL;
156 inline bool IsElementOfType( const char* tagname )
158 /* Confirm if the owner XML node represents a data element
159 * with the specified "tagname".
161 return this ? strcmp( GetName(), tagname ) == 0 : false;
164 /* Methods for retrieving the system root management records
165 * for a specified installed subsystem.
167 pkgXmlNode *GetSysRoot( const char *subsystem );
168 pkgXmlNode *GetInstallationRecord( const char* );
170 /* The following pair of methods provide an iterator
171 * for enumerating the contained nodes, within the owner,
172 * which themselves exhibit a specified tagname.
174 pkgXmlNode* FindFirstAssociate( const char* tagname );
175 pkgXmlNode* FindNextAssociate( const char* tagname );
177 /* Specific to XML node elements of type "release",
178 * the following pair of methods retrieve the actual name of
179 * the release tarball, and its associated source code tarball,
180 * as they are named on the project download servers.
182 const char* ArchiveName();
183 const char* SourceArchiveName();
186 enum { to_remove = 0, to_install, selection_types };
190 /* A class implementing a bi-directionally linked list of
191 * "action" descriptors, which is to be associated with the
192 * pkgXmlDocument class, specifying actions to be performed
193 * on the managed software installation.
196 /* Pointers to predecessor and successor in the linked list
197 * comprising the schedule of action items.
202 /* Flags define the specific action associated with this item.
206 /* Criteria for selection of package versions associated with
209 const char* min_wanted;
210 const char* max_wanted;
212 /* Pointers to the XML database entries for the package selected
213 * for processing by this action.
215 pkgXmlNode* selection[ selection_types ];
217 /* Method for retrieving packages from a distribution server.
219 void DownloadArchiveFiles( pkgActionItem* );
224 pkgActionItem( pkgActionItem* = NULL, pkgActionItem* = NULL );
226 /* Methods for assembling action items into a linked list.
228 pkgActionItem* Append( pkgActionItem* = NULL );
229 pkgActionItem* Insert( pkgActionItem* = NULL );
231 /* Methods for compiling the schedule of actions.
233 pkgActionItem* GetReference( pkgActionItem& );
234 pkgActionItem* Schedule( unsigned long, pkgActionItem& );
236 /* Methods for defining the selection criteria for
237 * packages to be processed.
239 const char* SetRequirements( pkgXmlNode* );
240 pkgXmlNode* SelectIfMostRecentFit( pkgXmlNode* );
241 inline void SelectPackage( pkgXmlNode *pkg, int opt = to_install )
243 /* Mark a package as the selection for a specified action.
245 selection[ opt ] = pkg;
247 inline pkgXmlNode* Selection( int mode = to_install )
249 /* Retrieve the package selection for a specified action.
251 return selection[ mode ];
254 /* Method for processing all scheduled actions.
259 class pkgXmlDocument : public TiXmlDocument
261 /* Minimal emulation of the wxXmlDocument class, founded on
262 * the tinyxml implementation of the TiXmlDocument class.
267 inline pkgXmlDocument(){}
268 inline pkgXmlDocument( const char* name )
270 /* tinyxml has a similar constructor, but unlike wxXmlDocument,
271 * it DOES NOT automatically load the document; force it.
275 /* Always begin with an empty actions list.
284 /* tinyxml doesn't have this, but instead provides a complementary
285 * `Error()' indicator, so to simulate `IsOk()'...
289 inline pkgXmlNode* GetRoot()
291 /* This is wxXmlDocument's method for locating the document root;
292 * it is equivalent to tinyxml's RootElement() method.
294 return (pkgXmlNode *)(RootElement());
296 inline void AddDeclaration
297 ( const char *version, const char *encoding, const char *standalone )
299 /* Not a standard method of either wxXmlDocumemnt or TiXmlDocument;
300 * this is a convenience method for setting up a new XML database.
302 LinkEndChild( new TiXmlDeclaration( version, encoding, standalone ) );
304 inline void SetRoot( TiXmlNode* root )
306 /* tinyxml has no direct equivalent for this wxXmlDocument method;
307 * to emulate it, we must first explicitly delete an existing root
308 * node, if any, then link the new root node as a document child.
311 if( (oldroot = GetRoot()) != NULL )
313 LinkEndChild( root );
315 inline bool Save( const char *filename )
317 /* This wxXmlDocument method for saving the database is equivalent
318 * to the corresponding tinyxml SaveFile( const char* ) method.
320 return SaveFile( filename );
324 /* Properties specifying the schedule of actions.
326 unsigned long request;
327 pkgActionItem* actions;
329 /* Method to synchronise the state of the local package manifest
330 * with the master copy held on the distribution server.
332 void SyncRepository( const char*, pkgXmlNode* );
335 /* Method to merge content from repository-specific package lists
336 * into the central XML package database.
338 pkgXmlNode* BindRepositories( bool );
340 /* Method to load the system map, and the lists of installed
341 * packages associated with each specified sysroot.
343 void LoadSystemMap();
345 /* Complementary method, to update the saved sysroot data associated
346 * with the active system map.
348 void UpdateSystemMap();
350 /* Method to locate the XML database entry for a named package.
352 pkgXmlNode* FindPackageByName( const char*, const char* = NULL );
354 /* Method to resolve the dependencies of a specified package,
355 * by walking the chain of references specified by "requires"
356 * elements in the respective package database entries.
358 void ResolveDependencies( pkgXmlNode*, pkgActionItem* = NULL );
360 /* Methods for compiling a schedule of actions.
362 void Schedule( unsigned long, const char* );
363 pkgActionItem* Schedule( unsigned long, pkgActionItem&, pkgActionItem* = NULL );
365 /* Method to execute a sequence of scheduled actions.
367 inline void ExecuteActions(){ actions->Execute(); }
370 EXTERN_C const char *xmlfile( const char*, const char* = NULL );
371 EXTERN_C int has_keyword( const char*, const char* );
373 typedef int (*strcmp_function)( const char *, const char * );
376 bool safe_strcmp( strcmp_function strcmp, const char *value, const char *proto )
378 /* Helper to compare a pair of "C" strings for equality,
379 * accepting NULL as a match for anything; for non-NULL matches,
380 * case sensitivity is determined by choice of strcmp function.
382 * N.B. Unlike the 'strcmp' function which this calls, this is
383 * a boolean function, returning TRUE when the 'strcmp' result
384 * is zero, (i.e. the sense of the result is inverted).
386 return (value == NULL) || (proto == NULL) || (strcmp( value, proto ) == 0);
389 /* Define a safe_strcmp() alias for an explicitly case sensitive match.
391 #define match_if_explicit( A, B ) safe_strcmp( strcmp, (A), (B) )
393 /* Further safe_strcmp() aliases provide for matching subsystem names,
394 * with implementation dependent case sensitivity...
396 #if CASE_INSENSITIVE_SUBSYSTEMS
397 # define subsystem_strcmp( A, B ) safe_strcmp( strcasecmp, (A), (B) )
399 # define subsystem_strcmp( A, B ) safe_strcmp( strcmp, (A), (B) )
402 /* ...and similarly, for matching of file names.
404 #if CASE_INSENSITIVE_FILESYSTEM
405 # define pkg_strcmp( A, B ) safe_strcmp( strcasecmp, (A), (B) )
407 # define pkg_strcmp( A, B ) safe_strcmp( strcmp, (A), (B) )
410 #endif /* PKGBASE_H: $RCSfile$: end of file */