B::XPath B::XPath class can search Perl optrees with XPath syntax.
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search Perl module perl search optrees XPath syntax

B::XPath Description

B::XPath class can search Perl optrees with XPath syntax. B::XPath class can search Perl optrees with XPath syntax.SYNOPSISPerl represents programs internally as a tree of opcodes. To execute a program, it walks this tree, performing each operation as it encounters it. The B family of modules allows you to examine (and in some cases, manipulate) this optree on programs even as they run.B::XPath allows you to use XPath syntax to select ops in the optree. use B::XPath; my $node = B::XPath->fetch_root( &some_function ); my $root = B::XPath->fetch_main_root(); # find all global scalar accesses my @globals = $root->match( '//gvsv' ); # find all global scalar accesses within some_function() named $bob my @bobs = $node->match( '//gvsv' );Class MethodsThere are two methods to use to start your match; both set the root of the tree to search. There's also a nice helper method you'll probably never use unless you find a bug.fetch_root( $subref )This method returns the B::XPath::Node object at the root of the optree for the subroutine reference. All matches performed on this node will search this branch of the optree for matching nodes.fetch_main_root()This method returns the B::XPath::Node object at the root of the program. Use this to search your entire program (at least, the part of it outside of any given subroutine).find_op_class( $op )Given a B::OP or descendent object, returns the name of the appropriate B::XPath::Node subclass to use to wrap that op so that B::XPath can manipulate it appropriately. Requirements: · Perl

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