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################################################################################################### |
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# Copyright 2013/2014 by Marcel Greter |
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# This file is part of OCBNET-CSS3 (GPL3) |
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#################################################################################################### |
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package OCBNET::CSS3::Regex::Numbers; |
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#################################################################################################### |
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our $VERSION = '0.2.5'; |
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#################################################################################################### |
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use strict; |
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use warnings; |
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#################################################################################################### |
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# load exporter and inherit from it |
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BEGIN { use Exporter qw(); our @ISA = qw(Exporter); } |
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# define our functions that will be exported |
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BEGIN { our @EXPORT = qw($re_number $re_percent $re_size $re_length $re_byte fromPx toPx); } |
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#################################################################################################### |
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# base regular expressions |
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#################################################################################################### |
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# match (floating point) numbers |
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#************************************************************************************************** |
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our $re_number = qr/[\-\+]?[0-9]*\.?[0-9]+/s; |
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# our $re_number_neg = qr/\-[0-9]*\.?[0-9]+/s; |
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# our $re_number_pos = qr/\+?[0-9]*\.?[0-9]+/s; |
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# regular expression to match a percent property |
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#************************************************************************************************** |
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our $re_percent = qr/$re_number(?:\%)/i; |
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# regular expression to match a size property |
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#************************************************************************************************** |
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our $re_size = qr/$re_number(?:em|ex|px|in|cm|mm|pt|pc)/i; |
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# regular expression to match any length property |
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#************************************************************************************************** |
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our $re_length = qr/$re_number(?:em|ex|px|\%|in|cm|mm|pt|pc)?/i; |
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# match a octal number from 0 to 255 (strict match) |
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#************************************************************************************************** |
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our $re_byte = qr/(?:0|[1-9]\d?|1\d{2}|2(?:[0-4]\d|5[0-5]))/s; |
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#################################################################################################### |
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# parse dimension from pixel |
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#************************************************************************************************** |
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sub fromPx |
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{ |
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# return undef if nothing passed |
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return unless defined $_[0]; |
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# parse number via regular expression (pretty strict) |
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$_[0] =~ m/\A\s*($re_number)(?:px)?\s*\z/i ? $1 : undef; |
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} |
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# adds pixel unit |
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#************************************************************************************************** |
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sub toPx |
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{ |
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# parse via fromPx |
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my $px = fromPx($_[0]); |
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# check if input was valid |
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return undef unless defined $px; |
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# format correctly |
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sprintf "%gpx", $px |
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} |
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#################################################################################################### |
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#################################################################################################### |
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1; |