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NAME

       tree -  Create and manage tree data objects.

SYNOPSIS

       tree create  ?-fixed? ?-dictset? ?-keyhash N? ?treeName?

       tree destroy treeName...

       tree names ?pattern?

       tree op subcmd ?subsubcmd ...? treeName ?arg arg ...?
_________________________________________________________________

DESCRIPTION

       The  tree  command is used to create, destroy, and provide Tcl access to a tree object.  A
       tree object is an ordered tree of nodes where each node can have data key-values, tags and
       a label.  The treeview widget uses a tree object.

INTRODUCTION

       Tree  provides Tcl with a rich API for managing complex data structures.  Here is a simple
       example.

               set t [tree create]
               set id [$t insert 0]
               $t set $id X 2
               set n [$t get $id X]

               # Create a node with label
               $t insert 0 -label A
               $t set 0->A    X 1
               set n [$t get 0->A X]

       Labels provide convenient -> indexing relative a starting node.

       Nodes may also be created with initial data values.

               $t insert 0 -label A -data {X 1   Y "a 1 b 2"}
               $t incr  0->A X 3
               $t set   0->A Y(a) 4

       Note round braces are used to access sub-values in a dict-array.  See  the  section  DICT-
       ARRAYS below for details.

SYNTAX

       tree create ?-fixed? ?-dictset? ?-keyhash N? ?treeName?
              Creates  a new tree object.  The name of the new tree is returned and a Tcl command
              is created.  If no treeName argument is present, then  the  name  of  the  tree  is
              automatically  generated  in the form "tree0", "tree1", etc relative to the current
              namespace.  A tree name  (if  given)  can  not  start  with  a  dash.   Tree  names
              containing the substring "#auto" will be replaced with a generated identifier.  For
              example, the name data#auto will translate to datatree0.  Note that  when  the  Tcl
              command is deleted the tree object also gets freed.

              Newly  created  trees  always  contain a single root node with id 0 that can not be
              deleted.

              Switches for create are listed below:

              -fixed    Make insert automatically set the -fixed flag.  This will disallow  later
                        setting  of  keys  not given as -data to the insert.  This includes dict-
                        array keys.  See the fixed sub-command.

              -dictset  Define that any update of an array field will coerce the array object  to
                        a  dict  object.  a dict will preserve order of sub-field keys on update.
                        See the dictset sub-command.

              -keyhash size
                        Define the size beyond which node key storage starts using  a  hash  (the
                        default  is  21  keys).   Normally  small numbers of keys are stored as a
                        list.  But once more than size keys are added  to  a  node,  key  storage
                        converts  to  a  hash.   This affects the order of key iteration (eg. for
                        get/names/values).  A list will iterate in the order in which  keys  were
                        added, whereas the order of a hash is undetermined.  For large numbers of
                        ordered keys, specify a really large size (eg. 1000000).

       tree destroy treeName...
              Releases one of more trees.  The Tcl  command  associated  with  treeName  is  also
              removed.   Trees  are  reference  counted.   The  internal  tree  data object isn't
              destroyed until no one else is using the tree.

       tree names ?pattern?
              Returns the names of all tree objects.  if a pattern argument is  given,  then  the
              only those trees whose name matches pattern will be listed.

       tree op subcmd ?subsubcmd ...? treeName ?arg arg ...?
              Provide  direct  calls  to  sub-commands, without going through the object command.
              Aside from self documentating, it allows  wize  to  provide  support  checked  tree
              calls.

NODE IDS AND TAGS

       Nodes  in  a tree object may be referenced by id or by tag.  Each node has a unique serial
       number or id that is assigned to it at creation. The id of an node  never  changes  or  is
       reused unless all nodes in a tree are delete.

       A  node  may  also  have any number of tags associated with it.  A tag is just a string of
       characters, and it may take any form but can not start  with  an  integer.   For  example,
       "x123"  is  valid, but "123x" is not.  The same tag may be associated with one or multiple
       nodes (ranges or tagnode).  Ranges are commonly used to group nodes in various interesting
       ways.

       Commands  that take a tagnode can operate on ranges and will accept either a tag or a list
       of zero or more integer node numbers.  A node-list may contain only integers, and can  not
       have  leading spaces.  Node-lists simplify the use of iterating commands because it avoids
       excessive use of eval.

       There are four built-in or psuedo tags:

              all       Applies to every node in the tree.

              nonroot   Applies to every node in the tree except the root node.

              rootchildren
                        Applies to every node in the tree whose parent is the root node.

              root      Managed automatically by the tree object, root specifies the node that is
                        currently set as the root node for the tree.

       When  specifying  nodes in tree object commands, if the specifier is an integer then it is
       assumed to refer to the single node with that id.  If the specifier  is  not  an  integer,
       then  it  is assumed to refer to all of the nodes in the tree that have a tag matching the
       specifier.  The symbol node is used below to indicate that an argument specifies either an
       id or a tag that selects a single node.  A tagnode is either a tag that selects a group of
       nodes, or it's a list of zero or more integer  node  numbers.   Many  tree  commands  only
       operate  on  a  single  node  at a time; if node is specified in a way that names multiple
       items, then an error "refers to more than one node" is generated.

NODE MODIFIERS

       You can also specify node in relation to another node by appending one or  more  modifiers
       to  the node id or tag after ->.  A modifier refers to a node in relation to the specified
       node.  For example, "root->firstchild" selects the first subtree of the root node.

       The following modifiers are available:

              firstchild
                        Selects the first child of the node.

              lastchild Selects the last child of the node.

              nextnode  Selects the next node in preorder to the node.

              nextsibling
                        Selects the next sibling of the node.

              parentnode
                        Selects the parent of the node.

              prevnode  Selects the previous node in preorder to the node.

              prevsibling
                        Selects the previous sibling of the node.

              maxnode   The maximum node number.

              "label"

              ยดlabel'

              label     Selects the child node whose label is label.  Enclosing label  in  quotes
                        (double  or  single)  supports  labels  with embedded spaces and prevents
                        matching reserved words (eg. a node labeled "parentnode").  If  mulitiple
                        child nodes have the same label, the first matching node is used.

       It's  an  error  if  the  node can't be found.  For example, lastchild and firstchild will
       generate errors if the node has no children.  The exception to this is the index operation
       which returns -1, allowing you to test if a modifier is valid.

TREE OPERATIONS

       Once  you  create  a  tree object, you can use its Tcl command to query or modify it.  The
       general form is treeName operation ?arg?...  Both operation and  its  arguments  determine
       the exact behavior of the command.  The operations available for trees are listed below.

       treeName ancestor node1 node2
              Returns  the mutual ancestor of the two nodes node1 and node2.  The ancestor can be
              one of the two nodes.  For example, if node1 and node2 are the  same  nodes,  their
              ancestor is node1.

       treeName append node key string ?string ...?
              Append one or more strings to node/key value.

       treeName appendi tagnode key string ?string ...?
              The  same  as  append  but  accepts  a  multi-node tag and an undefined key will be
              initialized to {}.  Returns the number of nodes updated.

       treeName apply node ?switches?
              Runs commands for all nodes matching the criteria given by switches for the subtree
              designated by node.  By default all nodes match, but you can set switches to narrow
              the match.  This operation differs from find in two ways: 1) Tcl  commands  can  be
              invoked  both pre- and post-traversal of a node and 2) the tree is always traversed
              in depth first order.

              The -exact, -glob, and -regexp switches indicate both what kind of pattern matching
              to perform and the pattern.  By default each pattern will be compared with the node
              label.  You can set more than one of these switches.  If any of the patterns  match
              (logical or), the node matches.  If the -key switch is used, it designates the data
              field to be matched.

              The valid switches are listed below:

              -depth number
                        Descend at most number (a non-negative integer) levels  If  number  is  1
                        this means only apply the tests to the children of node.

              -exact string
                        Matches each node using string.  The node must match string exactly.

              -glob string
                        Test each node to string using global pattern matching.  Matching is done
                        in a fashion similar to that used by string match.

              -invert   Invert the results of the pattern matching of -name.

              -isleaf   Only test nodes with no children.

              -istree   Only test nodes with children.

              -key key

              -keyglob key

              -keyregexp key

              -keyexact key
                        If pattern matching is selected (using  the  -exact,  -glob,  or  -regexp
                        switches),  compare  the values of the data field keyed by key instead of
                        the node's label.  If no pattern matching switches are set, then any node
                        with  this  data  key  will  match.  The field names may also be patterns
                        using -keyglob, etc.

              -nocase   Ignore case when matching patterns.

              -precommand command
                        Invoke command for each matching node.  Before command is invoked, the id
                        of  the node is appended.  You can control processing by the return value
                        of command.  If command generates an error, processing stops and the find
                        operation   returns  an  error.   But  if  command  returns  break,  then
                        processing stops, no error is generated.  If  command  returns  continue,
                        then processing stops on that subtree and continues on the next.

              -postcommand command
                        Invoke command for each matching node.  Before command is invoked, the id
                        of the node is appended.  You can control processing by the return  value
                        of command.  If command generates an error, processing stops and the find
                        operation  returns  an  error.   But  if  command  returns  break,   then
                        processing  stops,  no  error is generated.  If command returns continue,
                        then processing stops on that subtree and continues on the next.

              -regexp string
                        Test each node using string as a regular expression pattern.

              -tag string
                        Only test nodes that have the tag string.

              -usepath  Use the node's full path when comparing nodes.  The node's full path is a
                        list  of  labels,  starting  from  the root of each ancestor and the node
                        label.  The default is to compare only the node label.

       treeName attach ?-notags? ?treeObject?
              Queries or attaches to an existing tree object treeObject.  This is  primarly  used
              where  the  tree  object  was previously created via the C API (eg.  via TreeView).
              The current tree associated with treeName is discarded.  In addition,  the  current
              set  of  tags,  notifier events, and traces are removed.  If -notags is given, tags
              will not be shared.

       treeName children  ?-labels? node ?first? ?last?
              Returns a list of children for node.  If node is a leaf, then an  empty  string  is
              returned.   If  first  and/or  last  are  given  they  are the integer index of the
              children to display.  If the -labels option is used, labels are returned instead of
              the nodes.

       treeName copy srcNode ?destTree? parentNode ?switches?
              Copies  srcNode  into  parentNode.  Both  nodes srcNode and parentNode must already
              exist. The id of the new node is returned. You can copy from one tree  to  another.
              If  a  destTree argument is present, it indicates the name of the destination tree.
              By default both the source and destination trees are the same. The  valid  switches
              are listed below:

              -label string
                     Label  destNode  as  string.   By  default,  destNode  has the same label as
                     srcNode.

              -overwrite
                     Overwrite nodes that already exist.  Normally nodes are always created, even
                     if  there  already exists a node by the same name.  This switch indicates to
                     add or overwrite the node's data fields.

              -recurse
                     Recursively copy all the subtrees of srcNode as well.  In this case, srcNode
                     can't be an ancestor of destNode as it would result in a cyclic copy.

              -reverse
                     Reverse the direction of the copy.

              -tags  Copy  tag information.  Normally the following node is copied: its label and
                     data fields.  This indicates to copy tags as well.

       treeName create ?switches?
              Cause the creation of zero or more nodes.  Exactly one of -num, -nodes or -path  is
              required.   This  can  create  all nodes in a given -path or efficiently populate a
              tree with large numbers of nodes.  The return values is the id of the last  created
              node (or -path element).  The valid flags for switches are described below.

              -fixed    Set the fixed flag.

              -data list
                        Data to set in each node.

              -labelstart number
                        The  label  generated  nodes  is  to  use a sequence number starting from
                        number.  The default is to just use the node id.

              -nodes list
                        List of nodes ids to create.  The -offset option can specify  a  constant
                        to add.

              -num number
                        The number of nodes to create.

              -offset number
                        Number  to add to each element in -nodes.  For example, if loading sqlite
                        rowids you should use 1.  The default is 0.

              -parent node
                        The node to insert children into.  The default is the root node.

              -path pathList
                        Verify that a path exists and create any missing nodes.  Uses  labels  in
                        pathList  to  lookup  nodes,  creating them if not found.  The id for the
                        last node in the path is returned (created or not).

              -pos number
                        The position where to insert child nodes.  The  default  is  -1,  meaning
                        append.

              -prefix str
                        String prefix to add to each nodes label.

              -start number
                        Node nuber to start from when using -num.  The default is 1.

              -tags tagList
                        List of tags to add to each newly created node.

       treeName degree node
              Returns the number of children of node.

       treeName delete node...
              Recursively  deletes  one  or  more  nodes  from  the  tree.   The node and all its
              descendants are removed.   The one exception is the root node.  In this case,  only
              its descendants are removed.  The root node will remain.  Any tags or traces on the
              nodes are released.

       treeName depth node
              Returns the depth of the node.  The depth is the number of steps from the  node  to
              the root of the tree.  The depth of the root node is 0.

       treeName dictset ?bool?
              Get  or  set  the  dictset  flag for the tree which causes any set of an array sub-
              fields to force the value to type dict.  Unlike array  types,  dicts  preserve  the
              order  of  elements.  Setting this to one has the same effect as using the -dictset
              flag at tree creation time.

       treeName dump node ?switches?
              Save tree data for node and its descendants.  With the -file option, output goes to
              the  file  fileName  (this  is  unsupported  in  a safe interp).  With the -channel
              option, data is output to channel chan.  If neither option is given,  the  dump  is
              returned as data.

              The subtree designated by node is traversed to obtain the following information for
              each node: 1) the node's path relative to  node,  2)  a  sublist  key  value  pairs
              representing  the  node's  data fields, and 3) a sublist of tags.  and 4) the label
              This list returned can be used later to copy or restore the tree with  the  restore
              operation.

              The valid switches are listed below.

              -channel chan
                     Obtain  data  from  from  the given channel chan.  The channel is not closed
                     afterwards.

              -file fileName
                     Obtain data from from the file.  fileName.  This options is unsupported in a
                     safe interp.

              -keys list
                     A list of patterns of matching keys to be dumped.

              -skipkeys list
                     A list of patterns of matching keys not to be dumped.

              -tag pattern
                     A pattern match for tags to include in a node dump.

              -skiptag pattern
                     A pattern match for tags to not include in a node dump.

              -notags
                     Do not restore any tags

              -nopath
                     To  save  space,  do  not  dump the full path for each node.  Instead output
                     periods for all but the last path element.  Full paths  are  used  only  for
                     partial restores.

       treeName exists node ?key?
              Indicates  if  node  exists  in  the  tree.   If a key argument is present then the
              command also indicates if the named data field exists.

       treeName find ?switches?
              Finds for all nodes matching  the  criteria  given  by  switches  for  the  subtree
              designated  by  node.   A  list  of the selected nodes is returned.  By default all
              nodes match, but you can set switches to narrow the match.

              The -exact, -glob, and -regexp switches indicate what kind of pattern  matching  to
              perform  for  -name.   By default the pattern will be compared with the node label.
              If the -key switch is used, it designates the data field to be matched.

              The order in which the nodes are traversed is controlled  by  the   -order  switch.
              The  possible  orderings  are  preorder, postorder, inorder, and breadthfirst.  The
              default is preorder.

              The valid switches are listed below:

              -addtag string
                        Add the tag string to each selected node.  The tag will be  created  even
                        if no nodes are tagged.

              -column key
                        Use  value  with  field  given  by  key.   Like the treeview find -column
                        option, this key may contain an array referrence.

              -cmdargs columns
                        Specify columns whose values are to be appended to -command.

              -command command
                        Invoke command for each matching node.  Before command is invoked, the id
                        of  the node is appended.  You can control processing by the return value
                        of command.  If command generates an error, processing stops and the find
                        operation   returns  an  error.   But  if  command  returns  break,  then
                        processing stops, no error is generated.  If  command  returns  continue,
                        then  processing  stops  on  that  subtree and continues on the next.  If
                        command returns return, then the returned integer is used to  indicate  1
                        for match or 0 for mismatch.

              -count    Just return the number of matches.

              -depth number
                        Include only nodes with level equal to number.

              -exact    Matches each node exactly.

              -exec script
                        Specifies  a  Tcl script to be evaluated for each matching node.  If -var
                        was also specified, that variable is set with the value of  the  node  id
                        before  each  evaluation.  Otherwise, percent sustitutions are performed:
                        note this is much less efficient than using either -var or -command

                        The result of each eval gets appended to  the  return  list,  unless  the
                        script issues a CONTINUE, in which case that node is skipped.

                        The available percent substitutions on string are:

                        %#   The id of the node.

                        %W   The pathname of the tree.

                        %p   The label of the node.

                        %P   The full pathname of the node.

                        %R   The -> delimited path from root, eg. "root->able->baker->charlie"

                        %r   The -> delimited path from 0, eg. "0->able->baker->charlie"

                        %T   The dot delimited tag path eg. ".able.baker.charlie"

                        %V   The value if using -key or the label otherwise.

                        %D   The data for the node, ie. like that returned from get.

                        %%   Translates to a single percent.

              -glob     Test  each  node  using  global  pattern matching.  Matching is done in a
                        fashion similar to that used by the string match.

              -invert   Invert the pattern matching of -name.

              -isarray  Only test nodes where the specified -key value is an array.  Can  not  be
                        used  with -name.  The -invert flag will invert the meaning of the check.
                        Note that this will attempt to convert the key value  in  each  traversed
                        node into an array type.

              -isempty  Only match nodes where the specified -column key value was unset.

              -isfixed  Only test nodes that have used fixed 1.

              -isleaf   Only test nodes with no children.

              -isnotfixed
                        Only test nodes that have not used fixed 1.

              -istree   Only test nodes with children.

              -keycount num
                        Only test if number of keys is equal to num.

              -key key

              -keyglob key

              -keyregexp key

              -keyexact key
                        Compare  the  values of the data field keyed by key instead of the node's
                        label. If no -name pattern is used then any node with this data key  will
                        match.  The key names may also be patterns using -keyglob, etc.

              -limit number
                        Stop processing after number (a positive integer) matches.

              -maxdepth number
                        Include only nodes at level number or less.

              -mindepth number
                        Include only nodes at level number or greater.

              -name string
                        The name to use for pattern matching.

              -nocase   Ignore case when matching patterns.

              -nodes tagnode
                        Search  only  in  tagnode,  which is either a tag or a list of nodes ids.
                        This makes possible nested searches.  Note this  option  is  incompatible
                        with -top and -notop.

              -notop    Exclude the -top or starting node.

              -order string
                        Traverse  the  tree  and process nodes according to string. String can be
                        one of the following:

                        breadthfirst
                                  Process the node and the subtrees at each sucessive level. Each
                                  node on a level is processed before going to the next level.

                        inorder   Recursively  process  the  nodes of the first subtree, the node
                                  itself, and any the remaining subtrees.

                        postorder Recursively process all subtrees before the node.

                        preorder  Recursively  process  the  node  first,   then   any   subtrees
                                  (default).

              -usepath  Use  the  node's  full path when doing the comparison.  The default is to
                        compare only the node label.

              -regexp   Test each node using regular expression pattern matching.

              -reldepth Change the meaning of -depth, -mindepth and -maxdepth to be  relative  to
                        the -top node.

              -return key
                        Return  the  value of the given key, or the empty string if none.  If the
                        given key is the empty string, the node label will be  returned.   If  no
                        value  was  found  and  the  given  key starts with a percent returns the
                        sustitution as per -exec.  Note that a percent substitution longer than 2
                        chars will append values as list elements.

              -strict   Generate an error if a given key value is unset when using -return.

              -top node Search  is  only  at  node and it's descendants.  The default is the root
                        node.

              -var variable
                        A variable to set with the node id before each  iteration  of  the  -exec
                        script.

              -withouttag string
                        Only test nodes that don't have the tag string.

              -withtag string
                        Only test nodes that have the tag string.

       treeName findchild node label
              Searches  for  a child node label in node.  The id of the child node is returned if
              found.  Otherwise -1 is returned.  This is the same as using index node->label.

       treeName firstchild node
              Returns the id of the first child in the node's list of subtrees.   If  node  is  a
              leaf (has no children), then -1 is returned.

       treeName fixed node ?isfixed?
              Get  or set the fixed key-fields flag for a node.  New key-fields can be added to a
              node only if fixed is 0 (the default) If node is given as an empty string, operates
              on  the  tree  flag.  Note that copied and restored nodes do not preserve the fixed
              state.

       treeName foreach var tagnode script
              Provides a foreach loop for tree.  For each node in tagnode the node-id is assigned
              to var and then script is evaluated. The tagnode is either a tag or a list of nodes
              as described in the section NODE IDS AND TAGS above.

       treeName get node ?key? ?defaultValue?
              Returns a list of key-value pairs of data for node.  If key is present,  then  only
              the  value  for  that particular data field is returned.  It's normally an error if
              node does not contain the data field  key.   But  if  you  provide  a  defaultValue
              argument,  this  value is returned instead (node will still not contain key).  This
              feature can be used to access a data field of node  without  first  testing  if  it
              exists.  This operation may trigger read data traces.

       treeName incr node key ?amount?
              Increment  value  by  1  or  given amount and return the value.  The incr operation
              normally tries to use integers, but uses doubles when one of value or amount  is  a
              double.

       treeName incri tagnode key ?amount?
              The  same  as  incr  but  accepts  a  multi-node  tag  and an undefined key will be
              initialized to 0.  Returns the number of nodes updated.

       treeName index node
              Returns the id of node.  In addition to standard node id form, node can also  be  a
              path  (a list of labels from the root) as returned by the path command.  If node is
              invalid, then -1 is returned.

       treeName insert parent ?switches?
              Inserts a new node into parent node parent.  The id of the new  node  is  returned.
              The following switches are available:

              -after child
                        Position node after child.  The node child must be a child of parent.

              -before child
                        Position node before child.  The node child must be a child of parent.

              -data dataList
                        Sets the value for each data field in dataList for the new node. DataList
                        is a list of key-value pairs.  May not be used in conjuction with  -names
                        or  -values.

              -fixed bool
                        If bool is 1, set fixed field mode after initializing the key/value pairs
                        from -data.  This disallows creation of new key fields after the node  is
                        created.  If not given, the tree default for fixed is used.

              -label string
                        Designates  the  labels  of  the  node  as string.  By default, nodes are
                        labeled as 0, 1, etc.

              -names nameList
                        The names for the data  fields.   This  must  have  the  same  length  as
                        -values, and may not be used in conjuction with -data.

              -node id  Designates  the  id  for  the  node.   Normally new ids are automatically
                        generated.  This allows you to create a node with a specific id.   It  is
                        an error if the id is already used by another node in the tree.

              -pos number
                        Inserts  the node into parent's list of children at position number.  The
                        default is to append.

              -pretags tagList
                        Adds each tag in tagList to the new node, before data is  added.   Unlike
                        -tags, traces on these tags will fire on key data during the insert.

              -tags tagList
                        Adds  each  tag in tagList to the new node. TagList is a list of tags, so
                        be careful if a tag has embedded space.

              -values valueList
                        The values for the data fields.   This  must  have  the  same  length  as
                        -names, and may not be used in conjuction with -data.

       treeName is property args
              Indicates  the  property  of  a node. Both property and args determine the property
              being tested.  Returns 1 if true and 0 otherwise.  The following property and  args
              are valid:

              ancestor node1 node2
                        Indicates if node1 is an ancestor of node2.

              before node1 node2
                        Indicates if node1 is before node2 in depth first traversal.

              leaf node Indicates if node is a leaf (it has no subtrees).

              root node Indicates  if  node  is  the designated root.  This can be changed by the
                        root operation.

       treeName ismodified ?nodeOrTag? ?isflag?
              Get or set modified state for the tree or nodes.  With  no  args  returns  modified
              state  for  tree.   With one args returns modified state for a node.  With two args
              set modified state for one or more nodes.  In the last case, where  ?nodeOrTag?  is
              the tag all, the state for the tree is also set.

              Newly  created nodes are always considered to be modified until explicitly cleared.
              After clearing, subsequent updates to keys or tags will toggle the node (and  tree)
              modified again.

       treeName isset node key
              Return 1 if key is set in node.

       treeName keys node ?tagnode ...?
              Return  list  of unique keys for all of the given nodes in tagnode.  Keys are in no
              particular order.  Accepts nodes and tags or all.  See also names.

       treeName label node ?newLabel?
              Returns the label of the node designated by node.  If newLabel is present, the node
              is relabeled using it as the new label.

       treeName lappend node key value ?value ...?
              Append one or more list values to node/key value.

       treeName lappendi tagnode key value ?value ...?
              The  same  as  lappend  but  accepts  a multi-node tag and an undefined key will be
              initialized to {}.  Returns the number of nodes updated.

       treeName lastchild node
              Returns the id of the last child in the node's list of subtrees.  If node is a leaf
              (has no children), then -1 is returned.

       treeName modify tagnode key value ?key value...?
              Update  one  or more fields in one or more nodes in tagnode.  As with set, node can
              be a tag referring to multiple nodes.  This is identical to set, except an error is
              thrown if any of the key fields do not exist.  Despite the error, all nodes that do
              have said fields get updated.  For modifying a single node, see update.

       treeName move node newParent ?switches?
              Moves node into newParent. Node is appended to  the  list  children  of  newParent.
              Node  can  not  be  an  ancestor  of  newParent.   The valid flags for switches are
              described below.

              -after child
                        Position node after child.  The node child must be a child of newParent.

              -before child
                        Position node before child.  The node child must be a child of newParent.

              -pos number
                        Inserts node into parent's list  of  children  at  position  number.  The
                        default is -1 to append the node.

       treeName names node ?key? ?pattern?
              Return  key names for node, in the order defined (if possible).  If a key is given,
              attempts to return ARRAY fields (see DICT-ARRAYS).  If  a  pattern  is  given,  the
              array  keys  are limited to those matching the glob pattern.  An error is thrown if
              the convert to array fails (ie. list-length is odd).  The type command can be  used
              to query the type.  See also values.

       treeName next node
              Returns  the next node from node in a preorder traversal.  If node is the last node
              in the tree, then -1 is returned.

       treeName nextsibling node
              Returns the node representing the next subtree from node in its  parent's  list  of
              children.  If node is the last child, then -1 is returned.

       treeName nodeseq ?start?
              Get  or  set  the  start  sequence  number for subsequent node insertions not using
              -node.  The default is 0.

       treeName notify args
              Manages notification events that indicate that the tree structure has been changed.
              See the NOTIFY OPERATIONS section below.

       treeName oldvalue ?newvalue?
              Return  the  value  from before the last (untraced) change operation.  This is used
              primarly by write traces wishing to restore a key  to  it's  pre-write  value  (eg.
              read-only  variables).   The  oldvalue  is  saved  internally  everytime  a  change
              operation occurs to a key value by deferring its deallocation.  Changes made during
              node traces do not affect oldvalue.

              If  newvalue  is provided, the current value of oldvalue is discarded and replaced.
              This is useful really only for releasing large objects.

       treeName parent node
              Returns the parent node of node.  If node is the root  of  the  tree,  then  -1  is
              returned.

       treeName path node ?delim? ?prefix?
              Returns  the  full path (from root) of node using the node labels.  If delim is not
              specified, the result is a list.  Otherwise, the result is a string  starting  with
              prefix and each element of the path separated by delim.  This latter form is useful
              for building tags like: .able.baker

       treeName position  ?-sort? ?-format ftype? node ?node ...?
              Returns the position of the node(s) in its parent's list  of  children.   Positions
              are  numbered  from  0.   The  position of the root node is always 0.  The value of
              ftype is one of: position parent-at-position id+position id+parent-at-position.

       treeName previous node
              Returns the previous node from node in a preorder traversal.  If node is  the  root
              of the tree, then -1 is returned.

       treeName prevsibling node
              Returns  the  node representing the previous subtree from node in its parent's list
              of children.  If node is the first child, then -1 is returned.

       treeName restore node switches
              Performs the inverse function of the dump operation, restoring nodes to  the  tree.
              The  format  of  the  input data is exactly what is returned by the dump operation.
              It's a list containing information for each node to be restored.   The  information
              consists  of  1)  the  relative  path  of the node, 2) a sublist of key value pairs
              representing the node's data, 3) a list of tags for the node,  and  4)  the  label.
              Nodes  are  created  starting  from  node.  Nodes can be listed in any order.  If a
              node's  path  describes  ancestor  nodes  that  do  not  already  exist,  they  are
              automatically created.

              The  valid  switches  are  listed below.  Exactly one of -channel,  -file or  -data
              must be specified.

              -addtags
                     List of tags to add to each node restored node.  Each tag  will  be  created
                     only if a node loaded.

              -channel chan
                     Obtain  data  from  from  the given channel chan.  The channel is not closed
                     afterwards.

              -data string
                     Data input is from the given string.

              -file fileName
                     Obtain data from from the file.  fileName.  This options is unsupported in a
                     safe interp.

              -keys list
                     A list of patterns of matching keys to be restored.

              -skipkeys list
                     A list of patterns of matching keys not to be restored.

              -tag pattern
                     A pattern match for tags to include in a node restore.

              -skiptag pattern
                     A pattern match for tags to not include in a node restore.

              -notags
                     Do not restore any tags

              -overwrite
                     Overwrite nodes that already exist.  Normally nodes are always created, even
                     if there already exists a node by the same name.  This switch  indicates  to
                     overwrite existing node's data fields.

       treeName root ?node?
              Returns  the  id of the root node.  Normally this is node 0.  If a node argument is
              provided, it will become the new root of the tree. This lets you  temporarily  work
              within  a subset of the tree.  Changing root affects operations such as next, path,
              previous, etc.

       treeName set tagnode key value ?key value...?
              Sets one or more data fields in node. tagode may be a tag that  represents  several
              nodes  and  a count of the number of nodes updated is returned.  Key is the name of
              the data field to be set, or an array-like reference such  as  field(subkey).   See
              the DICT-ARRAYS section below.  Value is the respective keys value.  The  Key  will
              be created if it does not exists (see modify).

              The set operation triggers write and create data traces.

       treeName size node
              Returns the number of nodes in the subtree. This includes  the  node  and  all  its
              descendants.  The size of a leaf node is 1.

       treeName sort node ?switches?
              Return nodes in sorted order.

              -ascii    Compare strings using the ASCII  collation order.

              -command string
                        Use  command  string  as  a comparison command.  To compare two elements,
                        evaluate a Tcl script  consisting  of  command  with  the  five  elements
                        appended as additional arguments: the tree, node1, node1, label1, label2.
                        The script should return an integer less than, equal to, or greater  than
                        zero  if  the  first  element is to be considered less than, equal to, or
                        greater than the second, respectively.

              -decreasing
                        Sort in decreasing order (largest items come first).

              -dictionary
                        Compare strings using a dictionary-style comparison.  This is the same as
                        -ascii  except (a) case is ignored except as a tie-breaker and (b) if two
                        strings contain embedded numbers, the numbers compare  as  integers,  not
                        characters.   For  example,  in  -dictionary  mode,  bigBoy sorts between
                        bigbang and bigboy, and x10y sorts between x9y and x11y.

              -integer  Compare the nodes as integers.

              -key string
                        Sort based upon the node's data field keyed by string. Normally nodes are
                        sorted according to their label.  label.

              -real     Compare the nodes as real numbers.

              -recurse  Recursively sort the entire subtree rooted at node.

              -reorder  Recursively  sort  subtrees  for  each node.  Warning.  Unlike the normal
                        flat sort, where a list of nodes is returned, this will reorder the tree.

              -usepath  Compare the full path of each node.  The default is to compare  only  the
                        node label.

       treeName sqlload ?switches? dbhfile sqlstmt
              Load  tree  with  the  results  of  evaling  the SQL in sqlstmt using dbhfile.  The
              evaluated SQL creates one tree-node per row result.   The  returned  value  is  the
              number of rows loaded.  Dbhfile is either an sqlite3 database handle, or an sqlite3
              file.

              The sqlload command can populate a tree with 10k nodes about 7  times  faster  than
              sqlite3  eval.   It also preserves NULL values and object types (eg. int or double)
              used internally by sqlite.  This eliminates later reconversion  within  tree.   See
              the SQLLOAD EXAMPLE below.

              The following switches are available:

              -addtags taglist
                        The  tags  in  taglist  to  add  to each inserted node.  Each tag will be
                        created only if a node loaded.

              -fixed    Set the fixed flag to disallow new keys after creation.

              -key name Store the entire result in the key name instead of creating one  key  per
                        column.   Array notation can be used to then access column results.  This
                        is more efficent  as  it  initially  stores  just  one  object  per  row.
                        Conversion to an array is at the first array access (if that occurs).

              -labelcol column
                        The  value  of  column is used as the label.  By default the label is the
                        node id.

              -maprowid num
                        This option maps the node id to the rowid plus the constant num.  The key
                        for  rowid will also not be created.  This is applicable only if rowid is
                        returned in the result-set of sqlstmt.  If rowid is  not  in  the  result
                        set,  this option is ignored.  If mapping fails (because the tree already
                        contains a requested node) the load will abort  at  that  point  with  an
                        error.   Note that num must be >= 1 since sqlite rowids start from 0, but
                        the root node of the tree uses the node-id 0.

              -max num  The maximum number of rows to return.  The default is 100,000.  Note that
                        SQL queries on large tables should probably always use LIMIT.

              -nullvalue string
                        Define value to use for null values.  The default is no value, meaning do
                        not set key if value is null.  Note this is different from the sqlite Tcl
                        extension which uses an empty string for NULL.

              -parent string
                        The  node  where results are inserted as child nodes.  The default is the
                        tree root.

              -pathcol column
                        Name of column containing the full path where  node  is  to  be  created.
                        This works like -treecols, but uses a singl columns.

              -skipcols columns
                        The  given columns are not to be added as keys.  This is useful mostly in
                        conjuction with -tagcol, -labelcol, -pathcol.

              -pos num  Where to insert into parents list of children.  Default is -1, meaning to
                        append.

              -tagcol column
                        The value of column is added as a tag.

              -treecols columns
                        Columns  whose  values  concatenated give the path of where node is to be
                        created.  This works like -pathcol, but uses multiple columns.

       treeName sum ?switches? tagnode key ?key ...?
              Add values in key fields for all tagnode and return the sum.  Values that  are  not
              doubles (or integer) are ignored.

              -diff value
                        Double  value difference to ignore and not do update for -runtotal.  This
                        is unused when using -int.

              -force    Force update -runtotal even if value was unchanged.  Normally, a check is
                        made to avoid updating unchanged values.

              -int      Use and accept only integer values.

              -runtotal key
                        Place running total in the given key field (if changed).

              -start num
                        The start value for the sum: default is 0.

       treeName supdate node key value ?key value...?
              Like  update, but uses a string comparison to avoid writes if the value will not be
              changed.  This is useful primarily for avoiding unnecessary write traces.

       treeName tag args
              Manages tags for the tree object.  See the TAG OPERATIONS section below.

       treeName trace args
              Manages traces for data fields in the tree object.  Traces cause Tcl commands to be
              executed  whenever  a  data  field  of  a node is created, read, written, or unset.
              Traces can be set for a specific node or a tag, representing possibly  many  nodes.
              See the TRACE OPERATIONS section below.

       treeName type node key
              Return  type of value.  This is the introspected type from the Tcl_Obj value passed
              to set.

       treeName update node key value ?key value...?
              Like modify, except an error is generated if a tag is used  that  applies  to  more
              than one node.

       treeName unset node key...
              Removes  one  or  more  data  fields  from  node. Node may be a tag that represents
              several nodes.  Key is the name of the data field to be removed.  It's not an error
              is  node  does  not contain key.  A count of the number of nodes unset is returned.
              This operation may trigger unset data traces.

       treeName values node ?key? ?withnames?
              Return values for node.  The values are returned in the  same  order  as  the  keys
              returned from names.

              If  a  key  is  given, array values get returned for the key value.  If withname is
              True, then key names are also returned with the values.  This differs from  get  in
              that  the  result  is a true Tcl list object, not an array object.  If subsequently
              using an array value in a list context, this can be more efficient  by  avoiding  a
              split on string representations.

       treeName vecdump vector key ?tagnode?
              Dump  key  field  to  a  vector.   With  no  tagnode,  dumps  every node to the 1-1
              corresponding vector index.  With tag dumps nodes to consequetive vector elements.

       treeName vecload vector key ?tagnode?
              Loads key field from a vector.  With no tagnode, loads  every  node  from  the  1-1
              corresponding  vector  index.   With  tag  loads  nodes  from  consequetive  vector
              elements.

       treeName with variable ?switch? tagnode script
              For each node in tagnode,  evaluate  the  script  after  assigning  key  values  to
              elements  of  the array variable.  The -keys limits which keys may be assigned.  If
              script completes normally, and any of the key values change in the  variable,  then
              the  updates  are  reflected  back  into the key values (unless -noupdate is used).
              Unsetting a variable key will cause that change to be ignored.  New elements  added
              to the array variable are ignored.

              Doing  a  return, break, or continue inside script will still cause updates to copy
              back, but processing will stop and (unless -break is used)  the  return  code  will
              become  the  return  code  to  the  caller.  This means that a break, continue, and
              return will propagate up through multiple nested  with  statements  to  the  to  an
              enclosing  foreach, while, etc.  But -break can be used to change this, making with
              behave more like a foreach loop.

              If -keys is not used, the list of key names will be stored in variable(*)  and  the
              node  id  stored  in  variable(#) (which could then be overwritten by a key of that
              name).  By default, the array is not cleaned up before  or  after  each  execution.
              However,  if -unset is used, the array is unset at the start of each iteration, and
              -init can be used to specify a default value.  Also, long running queries can speed
              up by initializing variables prior to the call to with.

              If the variable name string is zero length, an simple variables are used instead of
              an array, and * and # do not get set.  Note, when not using -keys, arbitrary  local
              variables can get overwritten.

              If  -array  is used, with operates on the keys of an tree array/dict instead of the
              keys of the node.

              Upon normal completion, the number of times script was evaluated is returned.

              The valid switches are listed below:

              -array key
                        Specifies a single key that is to  be  treated  as  an  array-dict.   The
                        fields  of the array for that one key are then used (instead of keys from
                        the whole node).  This changes the meaning of -keys and -glob to  be  the
                        keys  of  the  array rather than the keys of the node.  Nodes missing the
                        given array key will be skipped.  If a key value can not be converted  to
                        an array, an error will occur.

              -break    Treat  break and continue like foreach does rather than just passing them
                        up to the enclosing script body.

              -init value
                        Variables specified by -keys are to be initialized to value for each node
                        where key is missing.

              -keys keylist
                        Copy only the named keys and does not set (*).

              -glob pattern
                        Pattern to limit matching keys.  Can not be used with -keys.

              -noupdate Ignore  changes  to  array  variables. This do not copy changed variables
                        back into tree nodes.

              -unset    Unset the array variable at the begin of each evaluation.

DICT-ARRAYS

       Round braces can be used to access sub-values of a key value.  In effect, this means  each
       key value can be an array (or dict), eg.

               set t [tree create]
               set n [$t insert 0 -data {a 1   b 2   c "x 9 y 8 z 7"}]
               $t get $n;          #  a 1 b 2 c {x 9 y 8 z 7}
               $t get $n c;        #  x 9 y 8 z 7
               $t get $n c(y);     # 8
               $t update $n c(y) 8.6
               $t get $n c;        # x 9 y 8.6 z 7
               $t unset $n c(y)
               $t get $n c;        # x 9 z 7
               $t set $n d 10
               $t incr $n d

       If  a  key value is a dict object tree will make use of it.  If not, on access it converts
       the value to a pure array hash object.  The following example shows the type in a  comment
       after each operation.

               set t [tree create]
               $t insert 0 -label A;
               $t set   0->A  X [dict create a 1 b 2 c 3];   # dict
               array set q { x 1 y 2 };
               $t set   0->A  Y [array get q];               # dict
               $t set   0->A  Z {m 0 n 1};                   # string
               $t incr  0->A  Z(m);                          # array
               dict size [$t get 0->A Z];                    # dict

       One advantage of using a dict is that it preserves order.  See dictset.

TAG OPERATIONS

       Tags  are  a  general  means  of selecting and marking nodes in the tree.  A tag is just a
       string of characters, and it may take any form except that of an integer.   The  same  tag
       may be associated with many different nodes.

       Most  tree  operations use tags.  And several operations let you operate on multiple nodes
       at once.  For example, you can use the set operation with the tag all to set a data  field
       in for all nodes in the tree.

       Tags  are  invoked  by  the  tag  operation.   The  general form is treeName tag operation
       ?arg?...  Both operation and its arguments determine the exact behavior  of  the  command.
       The operations available for tags are listed below.

       treeName tag add string ?node?...
              Adds the tag string to zero or more nodes.  If no nodes are given, just creates the
              tag.  A count of the number of nodes tagged is returned.

       treeName tag delete string node...
              Remove the tag string from one or more nodes.  A  count  of  the  number  of  nodes
              visited is returned.  Calling tag delete with a builtin tag is ignore.

       treeName tag dump tagnode ?switches?
              Dump the nodes specified by the tag tagnode.

              The valid switches are listed below.

              -keys list
                     A list of patterns of matching keys to be dumped.

              -skipkeys list
                     A list of patterns of matching keys not to be dumped.

              -tag pattern
                     A pattern match for tags to include in a node dump.

              -skiptag pattern
                     A pattern match for tags to not include in a node dump.

              -notags
                     Do not dump the tags.

              -nopath
                     To  save  space,  do  not  dump the full path for each node.  Instead output
                     periods for all but the last path element.  Full paths  are  used  only  for
                     partial restores.

       treeName tag exists string ?id?
              If  an  id  is given, return 1 (or 0)  if node has (or hasn't) the tag.  Otherwise,
              returns 1 if at least one nodes has tag string.

       treeName tag forget string ?string ...?
              Removes the tag definition for one or more of string.  It's not an error if the tag
              string does not exist.

       treeName tag lookups ?pattern?
              Dump  a  lookup table (dictionary) of nodes-to-tags, or tags-to-nodes if pattern is
              given.  With no arguments, returns a pair list of nodes/tags, for nodes  that  have
              tags.   With  an  argument,  returns  a  pair list of tags/nodes.  lookups provides
              efficient bulk processing when dealing with large numbers of nodes and/or tags.

       treeName tag names ?-glob? ?-regexp? ?-nocase?  ?node? ?node ...?
              Returns a list of tags used by the tree.  If no node argument is given,  returns  a
              list of all known tags.  Otherwise, returns the union of the tags used by all given
              node numbers.  Patterns can be used via -glob or -regexp.  If -nocase is used,  the
              pattern is expected to be all lower case.

       treeName tag nodes string ?string ...?
              Returns  a  list  of  any  nodes  that have any of given string tag.  If no node is
              tagged with any of the string, then an empty string is returned.

TRACE OPERATIONS

       Data fields can be traced much like tracing  Tcl  variables.   Data  traces  cause  a  Tcl
       command to be executed whenever data fields are created, read, written, or unset.  A trace
       can apply to one or more nodes.  You can trace a specific node by using its id, or a group
       of  nodes  by a their tag.  Note: operations on arrays trigger on the whole key value, not
       the individual array element.

       The tree's get, set, and unset operations can trigger various traces.  The  get  operation
       can  cause a read  trace to fire.  The set operation causes a write trace to fire.  And if
       the data field is written for the first time, you will also get a create trace.  The unset
       operation triggers unset traces.

       Data  traces  are  invoked  by  the  trace  operation.  The general form is treeName trace
       operation ?arg?...  Both operation and its arguments determine the exact behavior  of  the
       command.  The operations available for traces are listed below.

       treeName trace create node key ops command ?-bgerror?
              Create a trace on data fields (or tags for tag traces) given by the pattern in key.
              The node argument can be a nodeid, or a tag to refer to  multiple  nodes  eg.  all.
              The  return  value  is  an  identifier that can be used with "trace info" or "trace
              delete".  Traces are temporarily disabled while executing command within the trace.

              Command  is  a  command  prefix,  to  which  four  arguments  are  appended  before
              invocation:  treeName,  nodeid,  key  and, ops.  If an error occurs in command (and
              -bgerror was not used) the invoking operation will also abort.

              Ops indicates which operations are of interest.  It consists of one or more of  the
              following letters:

              r      Invoke command whenever key is read.

              w      Invoke command whenever key is written.

              c      Invoke command whenever key is created.

              u      Invoke  command whenever key is unset, typically with the unset command.  to
                     that.

              e      Invoke command whenever exists is used on an non-existant key.  This can  be
                     used to populate node key data on demand.

              t      Invoke command whenever tag key is added to a node.

              m      Invoke  command  when  tag key gets added to more than one node.  This trace
                     can be used to enforce tags that should be on at  most  one  node.   It  can
                     avoid  later  errors  with  tags used in get or other commands not accepting
                     non-unique tags.

              d      Invoke command whenever tag key is deleted from  a  node  using  either  tag
                     delete or tag forget.  Node deletion will not trigger this trace.

       treeName trace delete traceId...
              Deletes  one of more traces.  TraceId is the trace identifier returned by the trace
              create operation.

       treeName trace info traceId
              Returns information about  the  trace  traceId.   TraceId  is  a  trace  identifier
              previously  returned  by  the  trace  create  operation.  It's the same information
              specified for the trace create operation.  It consists of the node id or tag,  data
              field  key,  a string of letters indicating the operations that are traced (it's in
              the same form as ops) and, the command prefix.

       treeName trace names
              Returns a list of identifers for all the current traces.

NOTIFY OPERATIONS

       The purpose of notify is to get control when structural operations occur on a tree.   This
       is  used  internally  by  treeview  or example when a tree object is shared.  A client may
       create nodes, sort a tree, move a node,  etc.   Notifier  can  cause  such  operations  to
       generate events, resulting in Tcl commands being executed.

       The general form of notify is:

              treeName notify operation ?arg?...

       The available operation are as follows:

       treeName notify create ?switches? command ?args?...
              Creates  a  notifier  for  the  tree.   A  notify identifier in the form "notify0",
              "notify1", etc.  is returned.

              Command and args are saved and invoked  whenever  the  tree  structure  is  changed
              (controlled  by  switches).  Two  arguments are appended to command and args before
              it's invoked: the id of the node and a string representing the type of  event  that
              occured.   If  an  error  is  returned by command the invoking operation returns an
              error (when not using -whenidle).  One or more of the following switches  are  used
              to indicate the events that are of interest:

              -bgerror  Generate a background error if an error occurs.

              -create   Invoke  command  whenever  a new node is added.  This is called after the
                        creation.  Returning an error will delete the node.

              -delete   Invoke command whenever a node has been deleted.  This is  called  before
                        the  delete starts to allow aborting it with an error.  Deletes resulting
                        from failed inserts are ignored.

              -disabletrace
                        Disable traces from firing during a notify event.

              -get      Invoke command whenever a node with no  keys  is  accessed  (via  get  or
                        with).   If  a  node  has  at  least one key, this will not trigger.  The
                        invocation occurs before the read, meaning it can be  used  to  implement
                        demand  loading  of  data keys into empty nodes (eg. loading database row
                        data on read).

              -insert   Invoke command when an insert completes.  This differs  from  -create  in
                        that the call occurs after the label, tags and data are added (but before
                        -fixed gets set).  This trace applies to the  subcommands  create,  copy,
                        restore,  sqlload, and insert (both tree and treeview).  It is useful for
                        verifying key-data, tags and labels.  Returning an error will delete  the
                        node and cause the originating command to generate an error.

              -move     Invoke command at the start of a node move.

              -movepost Invoke command after a node has been moved.

              -sort     Invoke command whenever the tree has been sorted and reordered.

              -relabel  Invoke command at the start of a node relabel.

              -relabelpost
                        Invoke command after a node has been relabeled.

              -allevents
                        Invoke command whenever any of the above events occur.

              -whenidle When an event occurs don't invoke command immediately, but queue it to be
                        run the next time the event loop is entered and there are  no  events  to
                        process.   If  subsequent  events occur before the event loop is entered,
                        command will still be invoked only once.

       treeName notify delete notifyId
              Deletes one or more notifiers from the tree.  NotifyId is the  notifier  identifier
              returned by the notify create operation.

       treeName notify info notifyId
              Returns  information  about  the  notify  event  notifyId.   NotifyId  is  a notify
              identifier previously returned by the  notify  create  operation.   It's  the  same
              information  specified  for the notify create operation.  It consists of the notify
              id, a sublist of event flags (it's in the same form  as  flags)  and,  the  command
              prefix.

       treeName notify names
              Returns a list of identifers for all the current notifiers.

TABLE EXAMPLE

       The following is a simple example.

               variable Users {
                   tom  { Name "Tom Brown"  Sex M Age 19  Class {4 5} Rate {A 1 B 2}}
                   mary { Name "Mary Brown" Sex F Age 16  Class {5}   Rate {A 2}}
                   sam  { Name "Sam Spade"  Sex M Age 19  Class {3 4} Rate {B 3}}
               }
               set t [tree create]
               foreach {i d} $Users {
                  # Use name in -tags so we don't have to do "0->mary" etc.
                  $t insert 0 -tags $i -data $d -label $i
               }

               $t update   tom       Sex F   Name "Tomi Brown"
               $t append   sam       Name " Jr"
               $t lappend  sam       Class 5
               $t incr     mary      Age
               $t update   tom       Rate(A) 2
               $t incr     0->mary   Age

               # Set a trace.
               proc ::Aupd {t id key op} { tclLog "AA: $t $id $key $op" }
               $t trace create all Age w ::Aupd
               $t incr     mary Age

               # Display it.
               pack [treeview .t -tree $t] -fill both -expand y
               eval .t column insert end [$t keys all]

TREE EXAMPLE

       The following is a nested tree example with updates.

               variable Info {
                 system {
                    sol  { OS Linux Version 3.4 }
                    bing { OS Win Version 7 }
                    gui  { OS Mac Version 8 }
                 }
                 network {
                    intra { Address 192.168.1  Netmask 255.255.255.0 }
                    dmz   { Address 192.168.10 Netmask 255.255.255.0 }
                    wan   { Address 0.0.0.0 Netmask 0.0.0.0 Class {A 1 B 4}}
                 }
                 admins {
                    sully { Name "Sully Van Damme" Level 3 }
                    maverick { Name "Maverick Gump" Level 1 }
                 }
               }

               set s [tree create]
               foreach {n vals} $Info {
                 set ind [$s insert 0 -label $n]
                 foreach {i d} $vals {
                    $s insert $ind -label $i -data $d
                 }
               }

               set old [$s get  0->system->bing]
               $s update   0->system->bing   OS Linux Version 3.4
               $s update   0->network->dmz   Address 192.168.11
               $s update   0->network->wan   Class(A) 2
               eval $s set 0->system->bing   $old
               $s insert   0->admins -label linus -data { Name "Linus Torvalds" Level 9 }

               pack [treeview .s -tree $s -width 600] -fill both -expand y
               eval .s column insert end [$s keys all]

SQLLOAD EXAMPLE

       Here  is an example using sqlload on table cust from a database file, and displaying it in
       a treeview:

                set t [tree create]
                $t sqlload mydb.dat "select rowid,* from cust"
                pack [treeview .t -tree $t -width 500] -fill both -expand y
                eval .t column insert end [lsort [$t keys all]]

       Although there is no corresponding sqldump command, scripting it is  easy.   Following  is
       one approach.

                proc sqldump {t db table {ids {}}} {
                    # Dump nodes from tree t into table in open sqlite database db.
                    if {$ids == {}} { set ids [$t children root] }
                    set keys [$t keys $ids]
                    catch { $db eval "CREATE TABLE $table ( [join $keys ,] )" }
                    $t with s $ids {
                        set nams {}
                        set vals {}
                        foreach nam $s(*) {
                            lappend vals $s($nam)
                            lappend nams $nam
                        }
                        set vals [join $vals ,]
                        set nams [join $nams ,]
                        set q [format {INSERT INTO %s (%s) VALUES (%s)} $table $nams $vals]
                        $db eval $q
                    }
                }
                sqlite3 [set db dbhandle] mydb.dat
                sqldump $t $db cust2

TREE KEY STRING STORAGE

       Key  name  strings  are stored by default in a global hash table.  However, sometimes this
       can be undesirable (eg. with threading), and so the  behavior  may  be  changed  (at  tree
       create  time  only).   To  enable  per-interp storage of keys, set blt::treeKeysLocal to 1
       before tree creation.  To enable per-tree storage of keys,  set  blt::treeKeysLocal  to  2
       before tree creation.  The above is unavailable in safe interps.

C LANGUAGE API

       Blt_TreeApply,  Blt_TreeApplyBFS,  Blt_TreeApplyDFS,  Blt_TreeChangeRoot,  Blt_TreeCreate,
       Blt_TreeCreateEventHandler,            Blt_TreeCreateNode,            Blt_TreeCreateTrace,
       Blt_TreeDeleteEventHandler,   Blt_TreeDeleteNode,   Blt_TreeDeleteTrace,   Blt_TreeExists,
       Blt_TreeFindChild,      Blt_TreeFirstChild,       Blt_TreeFirstKey,       Blt_TreeGetNode,
       Blt_TreeGetToken,  Blt_TreeGetValue, Blt_TreeIsAncestor, Blt_TreeIsBefore, Blt_TreeIsLeaf,
       Blt_TreeLastChild,  Blt_TreeMoveNode,  Blt_TreeName,  Blt_TreeNextKey,   Blt_TreeNextNode,
       Blt_TreeNextSibling,      Blt_TreeNodeDegree,      Blt_TreeNodeDepth,      Blt_TreeNodeId,
       Blt_TreeNodeLabel,     Blt_TreeNodeParent,     Blt_TreePrevNode,      Blt_TreePrevSibling,
       Blt_TreeRelabelNode,     Blt_TreeReleaseToken,     Blt_TreeRootNode,     Blt_TreeSetValue,
       Blt_TreeSize, Blt_TreeSortNode, and Blt_TreeUnsetValue.

KEYWORDS

       tree, treeview, widget