File Coverage

blib/lib/Config/IOD/Expr.pm

Criterion	Covered	Total	%
statement	31	31	100.0
branch	3	4	75.0
condition			n/a
subroutine	10	10	100.0
pod			n/a
total	44	45	97.7

package Config::IOD::Expr;

use 5.010;
use strict;
use warnings;

our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2022-05-02'; # DATE
our $DIST = 'Config-IOD-Reader'; # DIST
our $VERSION = '0.345'; # VERSION

my $EXPR_RE = qr{

(?&ANSWER)

(?(DEFINE)

(?    (?&ADD))
(?       (?&MULT)   | (?&MULT)  (?: \s* ([+.-]) \s* (?&MULT)  )+)
(?      (?&UNARY)  | (?&UNARY) (?: \s* ([*/x%]) \s* (?&UNARY))+)
(?     (?&POWER)  | [!~+-] (?&POWER))
(?     (?&TERM)   | (?&TERM) (?: \s* \*\* \s* (?&TERM))+)

(?
    (?&NUM)
  | (?&STR_SINGLE)
  | (?&STR_DOUBLE)
  | undef
  | (?&VAR)
  | (?&FUNC)
  | \( \s* ((?&ANSWER)) \s* \)
)

(? val \s* \( (?&TERM) \))

(?
    (
     -?
     (?: 0 | [1-9][0-9]* )
     (?: \. [0-9]+ )?
     (?: [eE] [-+]? [0-9]+ )?
    )
)

(? \$[A-Za-z_][A-Za-z0-9_]{0,63})

(?
    (
     '
     (?:
         [^\\']+
       |
         \\ ['\\]
       |
         \\
     )*
     '
    )
)

(?
    (
     "
     (?:
         [^\\"]+
       |
         \\ ["'\\\$tnrfbae]
# octal, hex, wide hex
     )*
     "
    )
)

) # DEFINE

}msx;

sub _parse_expr {
    my $str = shift;

    return [400, 'Not a valid expr'] unless $str =~ m{\A$EXPR_RE\z}o;
    my $res = eval "package Config::IOD::Expr::_Compiled; no strict; no warnings; $str"; ## no critic: BuiltinFunctions::ProhibitStringyEval
    return [500, "Died when evaluating expr: $@"] if $@;
    [200, "OK", $res];
}

1;
# ABSTRACT: Parse expression

__END__