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grep: remove code-generator #756

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Oct 7, 2024
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grep: remove code-generator #756

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113 changes: 80 additions & 33 deletions bin/grep
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Original file line number Diff line number Diff line change
Expand Up @@ -138,7 +138,78 @@ sub run_tput {
}

sub parse_args {
my (%opt, $pattern, @patterns, $match_code, $SO, $SE);
my (%opt, $pattern, @patterns, $SO, $SE);

my $cls_grep = sub {
for my $pattern (@patterns) {
$Matches++ if m/$pattern/;
}
};
my $cls_grep_C = sub {
for my $pattern (@patterns) {
$Matches++ while m/$pattern/g;
}
};
my $cls_grep_v = sub {
for my $pattern (@patterns) {
$Matches += !/$pattern/;
}
};
my $cls_grep_g = sub {
for my $pattern (@patterns) {
$Matches += s/($pattern)/${SO}$1${SE}/g;
}
};
my $cls_fgrep = sub {
for my $pattern (@patterns) {
$Matches++ if index($_, $pattern) != -1;
}
};
my $cls_fgrep_v = sub {
for my $pattern (@patterns) {
$Matches++ if index($_, $pattern) == -1;
}
};
my $cls_fgrep_i = sub {
$_ = lc $_;
for my $pattern (@patterns) {
$Matches++ if index($_, lc $pattern) != -1;
}
};
my $cls_fgrep_iv = sub {
$_ = lc $_;
for my $pattern (@patterns) {
$Matches++ if index($_, lc $pattern) == -1;
}
};
my $cls_fgrep_x = sub {
my $s = $_;
chomp $s;
for my $pattern (@patterns) {
$Matches++ if $s eq $pattern;
}
};
my $cls_fgrep_xv = sub {
my $s = $_;
chomp $s;
for my $pattern (@patterns) {
$Matches++ if $s ne $pattern;
}
};
my $cls_fgrep_xi = sub {
my $s = lc $_;
chomp $s;
for my $pattern (@patterns) {
$Matches++ if $s eq lc($pattern);
}
};
my $cls_fgrep_xiv = sub {
my $s = lc $_;
chomp $s;
for my $pattern (@patterns) {
$Matches++ if $s ne lc($pattern);
}
};

if ( defined( $_ = $ENV{'GREP_OPTIONS'} ) ) {
s/^([^\-])/-$1/; # add leading - if missing
Expand All @@ -150,7 +221,6 @@ sub parse_args {

$opt{'l'} = 0 if $opt{'L'};
my $no_re = $opt{F} || ( $Me =~ /\bfgrep\b/ );
$match_code = '';

if (defined $opt{'f'}) { # -f patfile
my $path = $opt{'f'};
Expand Down Expand Up @@ -228,25 +298,21 @@ sub parse_args {
die "$Me: -g, -u and -w are incompatible with -F\n";
}
if ($opt{'x'}) { # exact match
my $testop = $opt{'v'} ? 'ne' : 'eq';
if ($opt{'i'}) {
$match_code = "my \$c=\$_; chomp \$c; for my \$pat (\@patterns) {\$Matches++ if (lc(\$c) $testop lc(\$pat)) }";
$matcher = $opt{'v'} ? $cls_fgrep_xiv : $cls_fgrep_xi;
}
else { # case sensitive
$match_code = "my \$c=\$_; chomp \$c; for my \$pat (\@patterns) {\$Matches++ if (\$c $testop \$pat) }";
$matcher = $opt{'v'} ? $cls_fgrep_xv : $cls_fgrep_x;
}
}
else { # regular match
my $testop = $opt{'v'} ? '==' : '!=';
if ($opt{'i'}) {
$match_code = "for my \$pat (\@patterns) { \$Matches++ if (index(lc \$_, lc \$pat) $testop -1) }";
$matcher = $opt{'v'} ? $cls_fgrep_iv : $cls_fgrep_i;
}
else { # case sensitive
$match_code = "for my \$pat (\@patterns) { \$Matches++ if (index(\$_, \$pat) $testop -1) }";
$matcher = $opt{'v'} ? $cls_fgrep_v : $cls_fgrep;
}
}
$matcher = eval "sub { $match_code }";
die if $@;
return (\%opt, $matcher);
}

Expand All @@ -273,29 +339,10 @@ sub parse_args {

foreach (@patterns) {s(/)(\\/)g}

if ( $opt{'g'} ) {
for my $pattern (@patterns) {
$match_code .= "\$Matches += s/($pattern)/${SO}\$1${SE}/g;";
}
}
elsif ( $opt{v} ) {
for my $pattern (@patterns) {
$match_code .= "\$Matches += !/$pattern/;";
}
}
elsif ( $opt{C} ) {
for my $pattern (@patterns) {
$match_code .= "\$Matches++ while /$pattern/g;";
}
}
else {
for my $pattern (@patterns) {
$match_code .= "\$Matches++ if /$pattern/;";
}
}

$matcher = eval "sub { $match_code }";
die if $@;
if ($opt{'g'}) { $matcher = $cls_grep_g; }
elsif ($opt{'v'}) { $matcher = $cls_grep_v; }
elsif ($opt{'C'}) { $matcher = $cls_grep_C; }
else { $matcher = $cls_grep; }

return ( \%opt, $matcher );
}
Expand Down
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