Commit | Line | Data |
c46d1069 |
1 | package Filter::Keyword::Parser; |
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2 | use Moo; |
3 | |
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4 | use Scalar::Util qw(set_prototype); |
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5 | |
6 | has reader => (is => 'ro', required => 1); |
7 | |
8 | has re_add => (is => 'ro', required => 1); |
9 | |
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10 | has keywords => (is => 'ro', default => sub { [] }); |
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11 | |
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12 | sub add_keyword { |
13 | push @{$_[0]->keywords}, $_[1]; |
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14 | } |
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15 | sub remove_keyword { |
16 | my ($self, $keyword) = @_; |
17 | my $keywords = $self->keywords; |
18 | for my $idx (0 .. $#$keywords) { |
19 | if ($keywords->[$idx] eq $keyword) { |
20 | splice @$keywords, $idx, 1; |
21 | last; |
22 | } |
23 | } |
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24 | } |
25 | |
26 | has current_match => (is => 'rw'); |
27 | |
28 | has short_circuit => (is => 'rw'); |
29 | |
30 | has code => (is => 'rw', default => sub { '' }); |
31 | |
32 | sub get_next { |
33 | my ($self) = @_; |
34 | if ($self->short_circuit) { |
35 | $self->short_circuit(0); |
36 | $self->${\$self->re_add}; |
37 | return ('', 0); |
38 | } |
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39 | for my $keyword (@{$self->keywords}) { |
40 | if ($keyword->have_match) { |
41 | $keyword->clear_globref; |
42 | return $keyword->parser->($keyword, $self); |
43 | } |
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44 | } |
45 | return $self->check_match; |
46 | } |
47 | |
48 | sub fetch_more { |
49 | my ($self) = @_; |
50 | my $code = $self->code||''; |
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51 | my ($extra_code, $not_eof) = $self->reader->(); |
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52 | $code .= $extra_code; |
53 | $self->code($code); |
54 | return $not_eof; |
55 | } |
56 | |
57 | sub match_source { |
58 | my ($self, $first, $second) = @_; |
59 | $self->fetch_more while $self->code =~ /$first\s+\Z/; |
60 | if (my @match = ($self->code =~ /(.*?${first}\s+${second})(.*)\Z/)) { |
61 | $self->code(pop @match); |
62 | my $found = shift(@match); |
63 | return ($found, \@match); |
64 | } |
65 | return; |
66 | } |
67 | |
68 | sub check_match { |
69 | my ($self) = @_; |
70 | unless ($self->code) { |
71 | $self->fetch_more |
72 | or return ('', 0); |
73 | } |
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74 | for my $keyword (@{ $self->keywords }) { |
75 | if ( |
76 | my ($stripped, $matches) |
77 | = $self->match_source( |
78 | $keyword->keyword_name, qr/(\(|[A-Za-z][A-Za-z_0-9]*|{)/ |
79 | ) |
80 | ) { |
81 | my $sub = sub {}; |
82 | set_prototype(\&$sub, '*;@') unless $matches->[0] eq '('; |
83 | { no warnings 'redefine', 'prototype'; *{$keyword->globref} = $sub; } |
84 | $keyword->save_refcount; |
85 | $self->current_match($matches); |
86 | $self->short_circuit(1); |
87 | return ($stripped, 1); |
88 | } |
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89 | } |
90 | my $code = $self->code; |
91 | $self->code(''); |
92 | return ($code, 1); |
93 | } |
94 | |
95 | 1; |