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=head1 NAME |
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Params::Classify - argument type classification |
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=head1 SYNOPSIS |
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use Params::Classify qw( |
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scalar_class |
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is_undef check_undef |
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is_string check_string |
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is_number check_number |
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is_glob check_glob |
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is_regexp check_regexp |
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is_ref check_ref ref_type |
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is_blessed check_blessed blessed_class |
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is_strictly_blessed check_strictly_blessed |
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is_able check_able |
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); |
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$c = scalar_class($arg); |
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if(is_undef($arg)) { |
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check_undef($arg); |
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if(is_string($arg)) { |
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check_string($arg); |
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if(is_number($arg)) { |
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check_number($arg); |
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if(is_glob($arg)) { |
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check_glob($arg); |
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if(is_regexp($arg)) { |
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check_regexp($arg); |
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if(is_ref($arg)) { |
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check_ref($arg); |
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$t = ref_type($arg); |
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if(is_ref($arg, "HASH")) { |
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check_ref($arg, "HASH"); |
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if(is_blessed($arg)) { |
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check_blessed($arg); |
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if(is_blessed($arg, "IO::Handle")) { |
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check_blessed($arg, "IO::Handle"); |
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$c = blessed_class($arg); |
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if(is_strictly_blessed($arg, "IO::Pipe::End")) { |
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check_strictly_blessed($arg, "IO::Pipe::End"); |
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if(is_able($arg, ["print", "flush"])) { |
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check_able($arg, ["print", "flush"]); |
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=head1 DESCRIPTION |
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This module provides various type-testing functions. These are intended |
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for functions that, unlike most Perl code, care what type of data they |
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are operating on. For example, some functions wish to behave differently |
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depending on the type of their arguments (like overloaded functions |
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in C++). |
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There are two flavours of function in this module. Functions of the first |
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flavour only provide type classification, to allow code to discriminate |
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between argument types. Functions of the second flavour package up the |
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most common type of type discrimination: checking that an argument is |
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of an expected type. The functions come in matched pairs, of the two |
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flavours, and so the type enforcement functions handle only the simplest |
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requirements for arguments of the types handled by the classification |
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functions. Enforcement of more complex types may, of course, be built |
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using the classification functions, or it may be more convenient to use |
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a module designed for the more complex job, such as L. |
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This module is implemented in XS, with a pure Perl backup version for |
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systems that can't handle XS. |
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=cut |
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package Params::Classify; |
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204949
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{ use 5.006001; } |
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use warnings; |
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use strict; |
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our $VERSION = "0.014"; |
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use parent "Exporter"; |
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our @EXPORT_OK = qw( |
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scalar_class |
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is_undef check_undef |
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is_string check_string |
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is_number check_number |
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is_glob check_glob |
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is_regexp check_regexp |
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is_ref check_ref ref_type |
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is_blessed check_blessed blessed_class |
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is_strictly_blessed check_strictly_blessed |
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is_able check_able |
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); |
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eval { local $SIG{__DIE__}; |
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require Devel::CallChecker; |
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Devel::CallChecker->VERSION(0.003); |
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}; |
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eval { local $SIG{__DIE__}; |
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require XSLoader; |
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XSLoader::load(__PACKAGE__, $VERSION); |
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}; |
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if($@ eq "") { |
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close(DATA); |
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} else { |
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(my $filename = __FILE__) =~ tr# -~##cd; |
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local $/ = undef; |
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my $pp_code = "#line 137 \"$filename\"\n".; |
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close(DATA); |
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{ |
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local $SIG{__DIE__}; |
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eval $pp_code; |
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} |
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die $@ if $@ ne ""; |
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} |
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sub is_string($); |
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sub is_number($) { |
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return 0 unless &is_string; |
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my $warned; |
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local $SIG{__WARN__} = sub { $warned = 1; }; |
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my $arg = $_[0]; |
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{ no warnings "void"; 0 + $arg; } |
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return !$warned; |
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} |
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sub check_number($) { |
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die "argument is not a number\n" unless &is_number; |
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} |
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1; |
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__DATA__ |