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https://github.com/djcb/mu.git
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225 lines
6.4 KiB
C
225 lines
6.4 KiB
C
/*
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** Copyright (C) 2011-2013 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
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**
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** This program is free software; you can redistribute it and/or modify it
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** under the terms of the GNU General Public License as published by the
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** Free Software Foundation; either version 3, or (at your option) any
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** later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software Foundation,
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** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**
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*/
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#ifndef __MU_CONTAINER_H__
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#define __MU_CONTAINER_H__
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#include <glib.h>
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#include <mu-msg.h>
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enum _MuContainerFlag {
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MU_CONTAINER_FLAG_NONE = 0,
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MU_CONTAINER_FLAG_DELETE = 1 << 0,
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MU_CONTAINER_FLAG_SPLICE = 1 << 1,
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MU_CONTAINER_FLAG_DUP = 1 << 2
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};
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typedef enum _MuContainerFlag MuContainerFlag;
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/*
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* MuContainer data structure, as seen in JWZs document:
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* http://www.jwz.org/doc/threading.html
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*/
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struct _MuContainer {
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struct _MuContainer *parent, *child, *next;
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/* note: we cache the last of the string of next->next->...
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* `mu_container_append_siblings' shows up high in the
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* profiles since it needs to walk to the end, and this give
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* O(n*n) behavior.
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* */
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struct _MuContainer *last;
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/* Node in the subtree rooted at this node which comes first
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* in the descending sort order, e.g. the latest message if
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* sorting by date. We compare the leaders when ordering
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* subtrees. */
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struct _MuContainer *leader;
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MuMsg *msg;
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const char *msgid;
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unsigned docid;
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MuContainerFlag flags;
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};
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typedef struct _MuContainer MuContainer;
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/**
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* create a new Container object
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*
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* @param msg a MuMsg, or NULL; when it's NULL, docid should be 0
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* @param docid a Xapian docid, or 0
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* @param msgid a message id, or NULL
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*
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* @return a new Container instance, or NULL in case of error; free
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* with mu_container_destroy
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*/
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MuContainer* mu_container_new (MuMsg *msg, guint docid, const char* msgid);
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/**
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* free a Container object
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*
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* @param c a Container object, or NULL
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*/
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void mu_container_destroy (MuContainer *c);
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/**
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* append new child(ren) to this container; the child(ren) container's
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* parent pointer will point to this one
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*
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* @param c a Container instance
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* @param child a child
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*
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* @return the Container instance with a child added
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*/
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MuContainer* mu_container_append_children (MuContainer *c, MuContainer *child);
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/**
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* append a new sibling to this (list of) containers; all the siblings
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* will get the same parent that @c has
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*
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* @param c a container instance
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* @param sibling a sibling
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*
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* @return the container (list) with the sibling(s) appended
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*/
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MuContainer* mu_container_append_siblings (MuContainer *c, MuContainer *sibling);
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/**
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* remove a _single_ child container from a container
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*
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* @param c a container instance
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* @param child the child container to remove
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*
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* @return the container with the child removed; if the container did
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* have this child, nothing changes
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*/
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MuContainer* mu_container_remove_child (MuContainer *c, MuContainer *child);
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/**
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* remove a _single_ sibling container from a container
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*
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* @param c a container instance
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* @param sibling the sibling container to remove
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*
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* @return the container with the sibling removed; if the container did
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* have this sibling, nothing changes
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*/
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MuContainer* mu_container_remove_sibling (MuContainer *c, MuContainer *sibling);
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/**
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* promote sibling's children to be this container's siblings
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*
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* @param c a container instance
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* @param sibling a sibling of this container
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*
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* @return the container with the sibling's children promoted
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*/
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MuContainer* mu_container_splice_children (MuContainer *c,
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MuContainer *sibling);
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/**
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* promote child's children to be parent's children
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*
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* @param parent a container instance
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* @param child a child of this container
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*
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* @return the new container with it's children's children promoted
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*/
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MuContainer* mu_container_splice_grandchildren (MuContainer *parent,
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MuContainer *child);
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typedef gboolean (*MuContainerForeachFunc) (MuContainer*, gpointer);
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/**
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* execute some function on all siblings an children of some container
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* (recursively) until all children have been visited or the callback
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* function returns FALSE
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*
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* @param c a container
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* @param func a function to call for each container
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* @param user_data a pointer to pass to the callback function
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*
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* @return
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*/
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gboolean mu_container_foreach (MuContainer *c,
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MuContainerForeachFunc func,
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gpointer user_data);
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/**
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* check whether container needle is a child or sibling (recursively)
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* of container haystack
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*
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* @param haystack a container
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* @param needle a container
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*
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* @return TRUE if needle is reachable from haystack, FALSE otherwise
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*/
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gboolean mu_container_reachable (MuContainer *haystack, MuContainer *needle);
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/**
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* dump the container to stdout (for debugging)
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*
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* @param c a container
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* @param recursive whether to include siblings, children
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*/
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void mu_container_dump (MuContainer *c, gboolean recursive);
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typedef int (*MuContainerCmpFunc) (MuContainer *c1, MuContainer *c2,
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gpointer user_data);
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/**
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* sort the tree of MuContainers, recursively; ie. each of the list of
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* siblings (children) will be sorted according to @func; if the
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* container is empty, the first non-empty 'leftmost' child is used.
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*
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* @param c a container
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* @param mfid the field to sort by
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* @param revert if TRUE, revert the sorting order *
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* @param user_data a user pointer to pass to the sorting function
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*
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* @return a sorted container
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*/
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MuContainer* mu_container_sort (MuContainer *c, MuMsgFieldId mfid,
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gboolean revert,
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gpointer user_data);
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/**
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* create a hashtable with maps document-ids to information about them,
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* ie. Xapian docid => MuMsgIterThreadInfo
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*
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* @param root_set the containers @param matchnum the number of
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* matches in the list (this is needed to determine the shortest
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* possible collation keys ('threadpaths') for the messages
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*
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* @return a hash; free with g_hash_table_destroy
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*/
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GHashTable* mu_container_thread_info_hash_new (MuContainer *root_set,
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size_t matchnum);
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#endif /*__MU_CONTAINER_H__*/
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