Beefy Boxes and Bandwidth Generously Provided by pair Networks
Keep It Simple, Stupid

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Here is a brief pseudo-grammar for XDumper's output. Note that whitespace is irrelevant and only used for clarity.
item -> var | special | label var -> ( label ':' )? classname? '<ro>'? (scalar | array | hash | glob | code | io | lvalue ) scalar -> number | string | ref | 'undef' ref -> '<weak>'? ( '\' item | '[' list? ']' | '{' hlist? '}' ) array -> '@(' list? ')' hash -> '%(' hlist? ')' list -> item (',' item)* hlist -> key '=>' item (',' key '=>' item)* glob -> '<anon>'? '*' package? name code -> '<format>'? '&(' filename ':' linenum ')' io -> '<io>' lvalue -> substr | pos | vec substr -> 'substr(' item ',' number ',' number ')' pos -> 'pos(' item ')' vec -> 'vec(' item ',' number ',' number ')' special -> '<undef>' | '<yes>' | '<no>'

In particular note that [...] is an abbreviation for \@(...) and {...} is an abbreviation for \%(...).

The abbeviated forms are used whenever possible, but sometimes it has to use the expanded form, for example when the array or hash has a prefix (blessing, read-only) or when it has a label.

For example $L001: <ro> \Foo @(1, 2) means that label $L001 names a read-only reference to a Foo-blessed array containing the numbers 1 and 2.

For people who know the perl guts: 'var', 'ref', 'array', 'hash' etc in the above grammar correspond one-to-one with SV, RV, AV, HV etc.

•Update: added format and io
•Update: added lvalues (completely forgot them earlier)

In reply to XDumper Grammar by xmath
in thread Data::XDumper by xmath

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others about the Monastery: (2)
As of 2023-01-29 04:55 GMT
Find Nodes?
    Voting Booth?

    No recent polls found