116 lines
4.0 KiB
Perl
116 lines
4.0 KiB
Perl
package version::regex;
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use strict;
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our $VERSION = 0.9924;
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#--------------------------------------------------------------------------#
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# Version regexp components
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#--------------------------------------------------------------------------#
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# Fraction part of a decimal version number. This is a common part of
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# both strict and lax decimal versions
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my $FRACTION_PART = qr/\.[0-9]+/;
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# First part of either decimal or dotted-decimal strict version number.
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# Unsigned integer with no leading zeroes (except for zero itself) to
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# avoid confusion with octal.
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my $STRICT_INTEGER_PART = qr/0|[1-9][0-9]*/;
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# First part of either decimal or dotted-decimal lax version number.
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# Unsigned integer, but allowing leading zeros. Always interpreted
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# as decimal. However, some forms of the resulting syntax give odd
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# results if used as ordinary Perl expressions, due to how perl treats
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# octals. E.g.
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# version->new("010" ) == 10
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# version->new( 010 ) == 8
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# version->new( 010.2) == 82 # "8" . "2"
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my $LAX_INTEGER_PART = qr/[0-9]+/;
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# Second and subsequent part of a strict dotted-decimal version number.
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# Leading zeroes are permitted, and the number is always decimal.
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# Limited to three digits to avoid overflow when converting to decimal
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# form and also avoid problematic style with excessive leading zeroes.
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my $STRICT_DOTTED_DECIMAL_PART = qr/\.[0-9]{1,3}/;
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# Second and subsequent part of a lax dotted-decimal version number.
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# Leading zeroes are permitted, and the number is always decimal. No
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# limit on the numerical value or number of digits, so there is the
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# possibility of overflow when converting to decimal form.
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my $LAX_DOTTED_DECIMAL_PART = qr/\.[0-9]+/;
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# Alpha suffix part of lax version number syntax. Acts like a
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# dotted-decimal part.
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my $LAX_ALPHA_PART = qr/_[0-9]+/;
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#--------------------------------------------------------------------------#
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# Strict version regexp definitions
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#--------------------------------------------------------------------------#
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# Strict decimal version number.
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our $STRICT_DECIMAL_VERSION =
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qr/ $STRICT_INTEGER_PART $FRACTION_PART? /x;
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# Strict dotted-decimal version number. Must have both leading "v" and
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# at least three parts, to avoid confusion with decimal syntax.
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our $STRICT_DOTTED_DECIMAL_VERSION =
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qr/ v $STRICT_INTEGER_PART $STRICT_DOTTED_DECIMAL_PART{2,} /x;
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# Complete strict version number syntax -- should generally be used
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# anchored: qr/ \A $STRICT \z /x
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our $STRICT =
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qr/ $STRICT_DECIMAL_VERSION | $STRICT_DOTTED_DECIMAL_VERSION /x;
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#--------------------------------------------------------------------------#
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# Lax version regexp definitions
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#--------------------------------------------------------------------------#
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# Lax decimal version number. Just like the strict one except for
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# allowing an alpha suffix or allowing a leading or trailing
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# decimal-point
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our $LAX_DECIMAL_VERSION =
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qr/ $LAX_INTEGER_PART (?: $FRACTION_PART | \. )? $LAX_ALPHA_PART?
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$FRACTION_PART $LAX_ALPHA_PART?
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/x;
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# Lax dotted-decimal version number. Distinguished by having either
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# leading "v" or at least three non-alpha parts. Alpha part is only
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# permitted if there are at least two non-alpha parts. Strangely
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# enough, without the leading "v", Perl takes .1.2 to mean v0.1.2,
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# so when there is no "v", the leading part is optional
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our $LAX_DOTTED_DECIMAL_VERSION =
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qr/
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v $LAX_INTEGER_PART (?: $LAX_DOTTED_DECIMAL_PART+ $LAX_ALPHA_PART? )?
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$LAX_INTEGER_PART? $LAX_DOTTED_DECIMAL_PART{2,} $LAX_ALPHA_PART?
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/x;
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# Complete lax version number syntax -- should generally be used
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# anchored: qr/ \A $LAX \z /x
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#
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# The string 'undef' is a special case to make for easier handling
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# of return values from ExtUtils::MM->parse_version
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our $LAX =
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qr/ undef | $LAX_DOTTED_DECIMAL_VERSION | $LAX_DECIMAL_VERSION /x;
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#--------------------------------------------------------------------------#
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# Preloaded methods go here.
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sub is_strict { defined $_[0] && $_[0] =~ qr/ \A $STRICT \z /x }
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sub is_lax { defined $_[0] && $_[0] =~ qr/ \A $LAX \z /x }
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1;
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