NAME¶
Pod::Abstract::Node - Pod Document Node.
SYNOPSIS¶
$node->nest( @list ); # Nests list as children of $node. If they
# exist in a tree they will be detached.
$node->clear; # Remove (detach) all children of $node
$node->hoist; # Append all children of $node after $node.
$node->detach; # Detaches intact subtree from parent
$node->select( $path_exp ); # Selects the path expression under $node
$node->select_into( $target, $path_exp );
# Selects into the children of the
# target node. (copies)
$node->insert_before($target); # Inserts $node in $target's tree
# before $target
$node->insert_after($target);
$node->push($target); # Appends $target at the end of this node
$node->unshift($target); # Prepends $target at the start of this node
$node->path(); # List of nodes leading to this one
$node->children(); # All direct child nodes of this one
$node->next(); # Following sibling if present
$node->previous(); # Preceding sibling if present
$node->duplicate(); # Duplicate node and children in a new tree.
$node->pod; # Convert node back into literal POD
$node->ptree; # Show visual (abbreviated) parse tree
METHODS¶
new¶
my $node = Pod::Abstract::Node->new(
type => ':text', body => 'Some text',
);
Creates a new, unattached Node object. This is NOT the recommended way to make
nodes to add to a document, use Pod::Abstract::BuildNode for that. There are
specific rules about how data must be set up for these nodes, and
"new" lets you ignore them.
Apart from type and body, all other hash arguments will be converted into
"params", which may be internal data or node attributes.
Type may be:
- •
- A plain word, which is taken to be a command name.
- •
- ":paragraph", ":text",
":verbatim" or <:X> (where X is an inline format letter).
These will be treated as you would expect.
- •
- "#cut", meaning this is literal, non-pod
text.
Note that these do not guarantee the resulting document structure will match
your types - types are derived from the document, not the other way around. If
your types do not match your document they will mutate when it is reloaded.
See Pod::Abstract::BuildNode if you want to make nodes easily for
creating/modifying a document tree.
ptree¶
print $n->ptree;
Produces a formatted, readable, parse tree. Shows node types, nesting structure,
abbreviated text. Does NOT show all information, but shows enough to help
debug parsing/traversal problems.
text¶
print $n->text;
Returns the text subnodes only of the given node, concatenated together - i,e,
the text only with no formatting at all.
pod¶
print $n->pod;
Returns the node (and all subnodes) formatted as POD. A newly loaded node should
produce the original POD text when pod is requested.
select¶
my @nodes = $n->select('/:paragraph[//:text =~ {TODO}]');
Select a pPath expression against this node. The above example will select all
paragraphs in the document containing 'TODO' in any of their text nodes.
The returned values are the real nodes from the document tree, and manipulating
them will transform the document.
select_into¶
$node->select_into($target_node, $path)
As with select, this will match a pPath expression against $node - but the
resulting nodes will be copied and added as children to $target_node. The
nodes that were added will be returned as a list.
type¶
$node->type( [ $new_type ] );
Get or set the type of the node.
body¶
$node->body( [ $new_body ] );
Get or set the node body text. This is NOT the child tree of the node, it is the
literal text as used by text/verbatim nodes.
param¶
$node->param( $p_name [, $p_value ] );
Get or set the named parameter. Any value can be used, but for document
attributes a Pod::Abstract::Node should be set.
duplicate¶
my $new_node = $node->duplicate;
Make a deep-copy of the node. The duplicate node returned has an identical
document tree, but different node identifiers.
insert_before¶
$node->insert_before($target);
Inserts $node before $target, as a sibling of $target. If $node is already in a
document tree, it will be removed from it's existing position.
insert_after¶
$node->insert_after($target);
Inserts $node after $target, as a sibling of $target. If $node is already in a
document tree, it will be removed from it's existing position.
hoist¶
$node->hoist;
Inserts all children of $node, in order, immediately after $node. After this
operation, $node will have no children. In pictures:
- a
- b
- c
- d
-f
$a->hoist; # ->
- a
- b
- c
- d
- f
clear¶
$node->clear;
Detach all children of $node. The detached nodes will be returned, and can be
safely reused, but they will no longer be in the document tree.
push¶
$node->push($target);
Pushes $target at the end of $node's children.
nest¶
$node->nest(@new_children);
Adds @new_children to $node's children. The new nodes will be added at the end
of any existing children. This can be considered the inverse of hoist.
unshift¶
$node->unshift($target);
The reverse of push, add a node to the start of $node's children.
serial¶
$node->serial;
The unique serial number of $node. This should never be modified.
attached¶
$node->attached;
Returns true if $node is attached to a document tree.
detach¶
$node->detach;
Removes a node from it's document tree. Returns true if the node was removed
from a tree, false otherwise. After this operation, the node will be detached.
Detached nodes can be reused safely.
parent¶
$node->parent;
Returns the parent of $node if available. Returns undef if no parent.
root¶
$node->root
Find the root node for the tree holding this node - this may be the original
node if it has no parent.
children¶
my @children = $node->children;
Returns the children of the node in document order.
next¶
my $next = $node->next;
Returns the following sibling of $node, if one exists. If there is no following
node undef will be returned.
previous¶
my $previous = $node->previous;
Returns the preceding sibling of $node, if one exists. If there is no preceding
node, undef will be returned.
coalesce_body¶
$node->coalesce_body(':verbatim');
This performs node coalescing as required by perlpodspec. Successive verbatim
nodes can be merged into a single node. This is also done with text nodes,
primarily for =begin/=end blocks.
The named node type will be merged together in the child document wherever there
are two or more successive nodes of that type. Don't use for anything except
":text" and ":verbatim" nodes unless you're really sure
you know what you want.
AUTHOR¶
Ben Lilburne <bnej@mac.com>
COPYRIGHT AND LICENSE¶
Copyright (C) 2009 Ben Lilburne
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.