A2P(1) Perl Programmers Reference Guide A2P(1)
NAME
a2p - Awk to Perl translator
SYNOPSIS
a2p [options] [filename]
DESCRIPTION
A2p takes an awk script specified on the command line (or from standard input) and produces a compa-rable comparable
rable perl script on the standard output.
OPTIONS
Options include:
-D<number>
sets debugging flags.
-F<character>
tells a2p that this awk script is always invoked with this -F switch.
-n<fieldlist>
specifies the names of the input fields if input does not have to be split into an array. If
you were translating an awk script that processes the password file, you might say:
a2p -7 -nlogin.password.uid.gid.gcos.shell.home
Any delimiter can be used to separate the field names.
-<number>
causes a2p to assume that input will always have that many fields.
-o tells a2p to use old awk behavior. The only current differences are:
* Old awk always has a line loop, even if there are no line actions, whereas new awk does
not.
* In old awk, sprintf is extremely greedy about its arguments. For example, given the state-ment statement
ment
print sprintf(some_args), extra_args;
old awk considers extra_args to be arguments to "sprintf"; new awk considers them arguments
to "print".
"Considerations"
A2p cannot do as good a job translating as a human would, but it usually does pretty well. There are
some areas where you may want to examine the perl script produced and tweak it some. Here are some
of them, in no particular order.
There is an awk idiom of putting int() around a string expression to force numeric interpretation,
even though the argument is always integer anyway. This is generally unneeded in perl, but a2p can't
tell if the argument is always going to be integer, so it leaves it in. You may wish to remove it.
Perl differentiates numeric comparison from string comparison. Awk has one operator for both that
decides at run time which comparison to do. A2p does not try to do a complete job of awk emulation
at this point. Instead it guesses which one you want. It's almost always right, but it can be
spoofed. All such guesses are marked with the comment ""#???"". You should go through and check
them. You might want to run at least once with the -w switch to perl, which will warn you if you use
== where you should have used eq.
Perl does not attempt to emulate the behavior of awk in which nonexistent array elements spring into
existence simply by being referenced. If somehow you are relying on this mechanism to create null
entries for a subsequent for...in, they won't be there in perl.
If a2p makes a split line that assigns to a list of variables that looks like (Fld1, Fld2, Fld3...)
you may want to rerun a2p using the -n option mentioned above. This will let you name the fields
throughout the script. If it splits to an array instead, the script is probably referring to the
number of fields somewhere.
The exit statement in awk doesn't necessarily exit; it goes to the END block if there is one. Awk
scripts that do contortions within the END block to bypass the block under such circumstances can be
simplified by removing the conditional in the END block and just exiting directly from the perl
script.
Perl has two kinds of array, numerically-indexed and associative. Perl associative arrays are called
"hashes". Awk arrays are usually translated to hashes, but if you happen to know that the index is
always going to be numeric you could change the {...} to [...]. Iteration over a hash is done using
the keys() function, but iteration over an array is NOT. You might need to modify any loop that
iterates over such an array.
Awk starts by assuming OFMT has the value %.6g. Perl starts by assuming its equivalent, $#, to have
the value %.20g. You'll want to set $# explicitly if you use the default value of OFMT.
Near the top of the line loop will be the split operation that is implicit in the awk script. There
are times when you can move this down past some conditionals that test the entire record so that the
split is not done as often.
For aesthetic reasons you may wish to change the array base $[ from 1 back to perl's default of 0,
but remember to change all array subscripts AND all substr() and index() operations to match.
Cute comments that say "# Here is a workaround because awk is dumb" are passed through unmodified.
Awk scripts are often embedded in a shell script that pipes stuff into and out of awk. Often the
shell script wrapper can be incorporated into the perl script, since perl can start up pipes into and
out of itself, and can do other things that awk can't do by itself.
Scripts that refer to the special variables RSTART and RLENGTH can often be simplified by referring
to the variables $`, $& and $', as long as they are within the scope of the pattern match that sets
them.
The produced perl script may have subroutines defined to deal with awk's semantics regarding getline
and print. Since a2p usually picks correctness over efficiency. it is almost always possible to re-write rewrite
write such code to be more efficient by discarding the semantic sugar.
For efficiency, you may wish to remove the keyword from any return statement that is the last state-ment statement
ment executed in a subroutine. A2p catches the most common case, but doesn't analyze embedded blocks
for subtler cases.
ARGV[0] translates to $ARGV0, but ARGV[n] translates to $ARGV[$n]. A loop that tries to iterate over
ARGV[0] won't find it.
ENVIRONMENT
A2p uses no environment variables.
AUTHOR
Larry Wall <larry@wall.org>
FILES
SEE ALSO
perl The perl compiler/interpreter
s2p sed to perl translator
DIAGNOSTICS
BUGS
It would be possible to emulate awk's behavior in selecting string versus numeric operations at run
time by inspection of the operands, but it would be gross and inefficient. Besides, a2p almost
always guesses right.
Storage for the awk syntax tree is currently static, and can run out.
perl v5.8.8 2005-04-04 A2P(1)
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