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 inline const char* GetName()
90 /* Retrieve the identifying name of the XML tag;
91 * tinyxml calls this the element "value"...
95 inline pkgXmlNode* GetParent()
97 /* wxXmlNode provides this equivalant of tinyxml's
100 return (pkgXmlNode*)(Parent());
102 inline pkgXmlNode* GetChildren()
104 /* wxXmlNode provides only this one method to access
105 * the children of an element; it is equivalent to the
106 * FirstChild() method in tinyxml's arsenal.
108 return (pkgXmlNode*)(FirstChild());
110 inline pkgXmlNode* GetNext()
112 /* This is wxXmlNode's method for visiting other children
113 * of an element, after the first found by GetChildren();
114 * it is equivalent to tinyxml's NextSibling().
116 return (pkgXmlNode*)(NextSibling());
118 inline const char* GetPropVal( const char* name, const char* subst )
120 /* tinyxml has no direct equivalent for this wxXmlNode method,
121 * (which substitutes default "subst" text for an omitted property),
122 * but it may be trivially emulated, using the Attribute() method.
124 const char* retval = Attribute( name );
125 return retval ? retval : subst;
127 inline pkgXmlNode* AddChild( TiXmlNode *child )
129 /* This is wxXmlNode's method for adding a child node, it is
130 * equivalent to tinyxml's LinkEndChild() method.
132 return (pkgXmlNode*)(LinkEndChild( child ));
134 inline bool DeleteChild( pkgXmlNode *child )
136 /* Both TiXmlNode and wxXmlNode have RemoveChild methods, but the
137 * implementations are semantically different; for tinyxml, we may
138 * simply use the RemoveChild method here, where for wxXmlNode, we
139 * would use RemoveChild followed by `delete child'.
141 return RemoveChild( child );
144 /* Additional methods specific to the application.
146 inline pkgXmlNode *GetDocumentRoot()
148 /* Convenience method to retrieve a pointer to the document root.
150 return (pkgXmlNode*)(GetDocument()->RootElement());
152 inline bool IsElementOfType( const char* tagname )
154 /* Confirm if the owner XML node represents a data element
155 * with the specified "tagname".
157 return strcmp( GetName(), tagname ) == 0;
160 /* Methods for retrieving the system root management records
161 * for a specified installed subsystem.
163 pkgXmlNode *GetSysRoot( const char *subsystem );
164 pkgXmlNode *GetInstallationRecord( const char* );
166 /* The following pair of methods provide an iterator
167 * for enumerating the contained nodes, within the owner,
168 * which themselves exhibit a specified tagname.
170 pkgXmlNode* FindFirstAssociate( const char* tagname );
171 pkgXmlNode* FindNextAssociate( const char* tagname );
173 /* Specific to XML node elements of type "release",
174 * the following pair of methods retrieve the actual name of
175 * the release tarball, and its associated source code tarball,
176 * as they are named on the project download servers.
178 const char* ArchiveName();
179 const char* SourceArchiveName();
182 enum { to_remove = 0, to_install, selection_types };
185 /* A class implementing a bi-directionally linked list of
186 * "action" descriptors, which is to be associated with the
187 * pkgXmlDocument class, specifying actions to be performed
188 * on the managed software installation.
191 /* Pointers to predecessor and successor in the linked list
192 * comprising the schedule of action items.
197 /* Flags define the specific action associated with this item.
201 /* Criteria for selection of package versions associated with
204 const char* min_wanted;
205 const char* max_wanted;
207 /* Pointers to the XML database entries for the package selected
208 * for processing by this action.
210 pkgXmlNode* selection[ selection_types ];
212 /* Method for retrieving packages from a distribution server.
214 void DownloadArchiveFiles( pkgActionItem* );
219 pkgActionItem( pkgActionItem* = NULL, pkgActionItem* = NULL );
221 /* Methods for assembling action items into a linked list.
223 pkgActionItem* Append( pkgActionItem* = NULL );
224 pkgActionItem* Insert( pkgActionItem* = NULL );
226 /* Methods for compiling the schedule of actions.
228 pkgActionItem* GetReference( pkgActionItem& );
229 pkgActionItem* Schedule( unsigned long, pkgActionItem& );
231 /* Methods for defining the selection criteria for
232 * packages to be processed.
234 const char* SetRequirements( pkgXmlNode* );
235 pkgXmlNode* SelectIfMostRecentFit( pkgXmlNode* );
236 inline void SelectPackage( pkgXmlNode *pkg, int opt = to_install )
238 /* Mark a package as the selection for a specified action.
240 selection[ opt ] = pkg;
242 inline pkgXmlNode* Selection( int mode = to_install )
244 /* Retrieve the package selection for a specified action.
246 return selection[ mode ];
249 /* Method for processing all scheduled actions.
254 class pkgXmlDocument : public TiXmlDocument
256 /* Minimal emulation of the wxXmlDocument class, founded on
257 * the tinyxml implementation of the TiXmlDocument class.
262 inline pkgXmlDocument(){}
263 inline pkgXmlDocument( const char* name )
265 /* tinyxml has a similar constructor, but unlike wxXmlDocument,
266 * it DOES NOT automatically load the document; force it.
270 /* Always begin with an empty actions list.
279 /* tinyxml doesn't have this, but instead provides a complementary
280 * `Error()' indicator, so to simulate `IsOk()'...
284 inline pkgXmlNode* GetRoot()
286 /* This is wxXmlDocument's method for locating the document root;
287 * it is equivalent to tinyxml's RootElement() method.
289 return (pkgXmlNode *)(RootElement());
291 inline void AddDeclaration
292 ( const char *version, const char *encoding, const char *standalone )
294 /* Not a standard method of either wxXmlDocumemnt or TiXmlDocument;
295 * this is a convenience method for setting up a new XML database.
297 LinkEndChild( new TiXmlDeclaration( version, encoding, standalone ) );
299 inline void SetRoot( TiXmlNode* root )
301 /* tinyxml has no direct equivalent for this wxXmlDocument method;
302 * to emulate it, we must first explicitly delete an existing root
303 * node, if any, then link the new root node as a document child.
306 if( (oldroot = GetRoot()) != NULL )
308 LinkEndChild( root );
310 inline bool Save( const char *filename )
312 /* This wxXmlDocument method for saving the database is equivalent
313 * to the corresponding tinyxml SaveFile( const char* ) method.
315 return SaveFile( filename );
319 /* Properties specifying the schedule of actions.
321 unsigned long request;
322 pkgActionItem* actions;
324 /* Method to synchronise the state of the local package manifest
325 * with the master copy held on the distribution server.
327 void SyncRepository( const char*, pkgXmlNode* );
330 /* Method to merge content from repository-specific package lists
331 * into the central XML package database.
333 pkgXmlNode* BindRepositories( bool );
335 /* Method to load the system map, and the lists of installed
336 * packages associated with each specified sysroot.
338 void LoadSystemMap();
340 /* Complementary method, to update the saved sysroot data associated
341 * with the active system map.
343 void UpdateSystemMap();
345 /* Method to locate the XML database entry for a named package.
347 pkgXmlNode* FindPackageByName( const char*, const char* = NULL );
349 /* Method to resolve the dependencies of a specified package,
350 * by walking the chain of references specified by "requires"
351 * elements in the respective package database entries.
353 void ResolveDependencies( pkgXmlNode*, pkgActionItem* = NULL );
355 /* Methods for compiling a schedule of actions.
357 void Schedule( unsigned long, const char* );
358 pkgActionItem* Schedule( unsigned long, pkgActionItem&, pkgActionItem* = NULL );
360 /* Method to execute a sequence of scheduled actions.
362 inline void ExecuteActions(){ actions->Execute(); }
365 EXTERN_C const char *xmlfile( const char*, const char* = NULL );
366 EXTERN_C int has_keyword( const char*, const char* );
368 typedef int (*strcmp_function)( const char *, const char * );
371 bool safe_strcmp( strcmp_function strcmp, const char *value, const char *proto )
373 /* Helper to compare a pair of "C" strings for equality,
374 * accepting NULL as a match for anything; for non-NULL matches,
375 * case sensitivity is determined by choice of strcmp function.
377 * N.B. Unlike the 'strcmp' function which this calls, this is
378 * a boolean function, returning TRUE when the 'strcmp' result
379 * is zero, (i.e. the sense of the result is inverted).
381 return (value == NULL) || (proto == NULL) || (strcmp( value, proto ) == 0);
384 /* Define a safe_strcmp() alias for an explicitly case sensitive match.
386 #define match_if_explicit( A, B ) safe_strcmp( strcmp, (A), (B) )
388 /* Further safe_strcmp() aliases provide for matching subsystem names,
389 * with implementation dependent case sensitivity...
391 #if CASE_INSENSITIVE_SUBSYSTEMS
392 # define subsystem_strcmp( A, B ) safe_strcmp( strcasecmp, (A), (B) )
394 # define subsystem_strcmp( A, B ) safe_strcmp( strcmp, (A), (B) )
397 /* ...and similarly, for matching of file names.
399 #if CASE_INSENSITIVE_FILESYSTEM
400 # define pkg_strcmp( A, B ) safe_strcmp( strcasecmp, (A), (B) )
402 # define pkg_strcmp( A, B ) safe_strcmp( strcmp, (A), (B) )
405 #endif /* PKGBASE_H: $RCSfile$: end of file */