JezK
Edit File: regex.pm
package version::regex; use strict; our $VERSION = 0.9929; #--------------------------------------------------------------------------# # Version regexp components #--------------------------------------------------------------------------# # Fraction part of a decimal version number. This is a common part of # both strict and lax decimal versions my $FRACTION_PART = qr/\.[0-9]+/; # First part of either decimal or dotted-decimal strict version number. # Unsigned integer with no leading zeroes (except for zero itself) to # avoid confusion with octal. my $STRICT_INTEGER_PART = qr/0|[1-9][0-9]*/; # First part of either decimal or dotted-decimal lax version number. # Unsigned integer, but allowing leading zeros. Always interpreted # as decimal. However, some forms of the resulting syntax give odd # results if used as ordinary Perl expressions, due to how perl treats # octals. E.g. # version->new("010" ) == 10 # version->new( 010 ) == 8 # version->new( 010.2) == 82 # "8" . "2" my $LAX_INTEGER_PART = qr/[0-9]+/; # Second and subsequent part of a strict dotted-decimal version number. # Leading zeroes are permitted, and the number is always decimal. # Limited to three digits to avoid overflow when converting to decimal # form and also avoid problematic style with excessive leading zeroes. my $STRICT_DOTTED_DECIMAL_PART = qr/\.[0-9]{1,3}/; # Second and subsequent part of a lax dotted-decimal version number. # Leading zeroes are permitted, and the number is always decimal. No # limit on the numerical value or number of digits, so there is the # possibility of overflow when converting to decimal form. my $LAX_DOTTED_DECIMAL_PART = qr/\.[0-9]+/; # Alpha suffix part of lax version number syntax. Acts like a # dotted-decimal part. my $LAX_ALPHA_PART = qr/_[0-9]+/; #--------------------------------------------------------------------------# # Strict version regexp definitions #--------------------------------------------------------------------------# # Strict decimal version number. our $STRICT_DECIMAL_VERSION = qr/ $STRICT_INTEGER_PART $FRACTION_PART? /x; # Strict dotted-decimal version number. Must have both leading "v" and # at least three parts, to avoid confusion with decimal syntax. our $STRICT_DOTTED_DECIMAL_VERSION = qr/ v $STRICT_INTEGER_PART $STRICT_DOTTED_DECIMAL_PART{2,} /x; # Complete strict version number syntax -- should generally be used # anchored: qr/ \A $STRICT \z /x our $STRICT = qr/ $STRICT_DECIMAL_VERSION | $STRICT_DOTTED_DECIMAL_VERSION /x; #--------------------------------------------------------------------------# # Lax version regexp definitions #--------------------------------------------------------------------------# # Lax decimal version number. Just like the strict one except for # allowing an alpha suffix or allowing a leading or trailing # decimal-point our $LAX_DECIMAL_VERSION = qr/ $LAX_INTEGER_PART (?: $FRACTION_PART | \. )? $LAX_ALPHA_PART? | $FRACTION_PART $LAX_ALPHA_PART? /x; # Lax dotted-decimal version number. Distinguished by having either # leading "v" or at least three non-alpha parts. Alpha part is only # permitted if there are at least two non-alpha parts. Strangely # enough, without the leading "v", Perl takes .1.2 to mean v0.1.2, # so when there is no "v", the leading part is optional our $LAX_DOTTED_DECIMAL_VERSION = qr/ v $LAX_INTEGER_PART (?: $LAX_DOTTED_DECIMAL_PART+ $LAX_ALPHA_PART? )? | $LAX_INTEGER_PART? $LAX_DOTTED_DECIMAL_PART{2,} $LAX_ALPHA_PART? /x; # Complete lax version number syntax -- should generally be used # anchored: qr/ \A $LAX \z /x # # The string 'undef' is a special case to make for easier handling # of return values from ExtUtils::MM->parse_version our $LAX = qr/ undef | $LAX_DOTTED_DECIMAL_VERSION | $LAX_DECIMAL_VERSION /x; #--------------------------------------------------------------------------# # Preloaded methods go here. sub is_strict { defined $_[0] && $_[0] =~ qr/ \A $STRICT \z /x } sub is_lax { defined $_[0] && $_[0] =~ qr/ \A $LAX \z /x } 1;