June 2002
Beginner
759 pages
80h 42m
English
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B::Concise
A module that walks the Perl syntax tree, printing concise info about the internal OPs of a Perl program’s syntax tree. The format of the information displayed is customizable. Its function is similar to that of Perl’s -Dx debugging flag or the B::Terse module, but it is more sophisticated and flexible. Invoke as:
perl -MO=Concise[,options]program
program is the name of the Perl
script to compile. Any non-option arguments are treated as the names
of objects to be saved; the main program is assumed if there are no
extra arguments. Possible options are:
- -basic
Prints OPs in the order they appear in the OP tree (a preorder traversal, starting at the root). Default.
- -exec
Prints OPs in the order they would normally execute. For the majority of constructs, this is a postorder traversal of the tree, ending at the root.
- -tree
Prints OPs in a text approximation of a tree, with the root of the tree at the left and “left-to-right” order of children transformed into “top-to-bottom”. Unsuitable for large programs.
- -compact
Uses a tree format in which the minimum amount of space is used for the lines connecting nodes (one character in most cases).
- -loose
Uses a tree format that uses longer edges to separate OP nodes. Default.
- -vt
Uses tree-connecting characters drawn from the VT100 line-drawing set.
- -ascii
Draws the tree with standard ASCII characters such as
+and|. Default.- -main
Includes the main program in the output, even if subroutines were also specified.
- -basen
Prints OP sequence numbers in ...
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