Commit | Line | Data |
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1 | package Devel::REPL::Plugin::Completion; |
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2 | use Devel::REPL::Plugin; |
3 | use Scalar::Util 'weaken'; |
4 | use PPI; |
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5 | use namespace::clean -except => [ 'meta' ]; |
6 | |
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7 | has current_matches => ( |
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8 | is => 'rw', |
9 | isa => 'ArrayRef', |
10 | lazy => 1, |
11 | default => sub { [] }, |
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12 | ); |
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13 | |
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14 | has match_index => ( |
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15 | is => 'rw', |
16 | isa => 'Int', |
17 | lazy => 1, |
18 | default => sub { 0 }, |
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19 | ); |
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20 | |
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21 | has no_term_class_warning => ( |
22 | isa => "Bool", |
23 | is => "rw", |
24 | default => 0, |
25 | ); |
26 | |
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27 | before 'read' => sub { |
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28 | my ($self) = @_; |
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29 | |
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30 | if ((!$self->term->isa("Term::ReadLine::Gnu") and !$self->term->isa("Term::ReadLine::Perl")) |
31 | and !$self->no_term_class_warning) { |
32 | warn "Term::ReadLine::Gnu or Term::ReadLine::Perl is required for the Completion plugin to work"; |
33 | $self->no_term_class_warning(1); |
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34 | } |
35 | |
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36 | my $weakself = $self; |
37 | weaken($weakself); |
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38 | |
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39 | $self->term->Attribs->{attempted_completion_function} = sub { |
40 | $weakself->_completion(@_); |
41 | }; |
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42 | |
43 | $self->term->Attribs->{completion_function} = sub { |
44 | $weakself->_completion(@_); |
45 | }; |
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46 | }; |
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47 | |
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48 | sub _completion { |
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49 | my $is_trp = scalar(@_) == 4 ? 1 : 0; |
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50 | my ($self, $text, $line, $start, $end) = @_; |
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51 | $end = $start+length($text) if $is_trp; |
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52 | |
53 | # we're discarding everything after the cursor for completion purposes |
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54 | # we can't just use $text because we want all the code before the cursor to |
55 | # matter, not just the current word |
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56 | substr($line, $end) = ''; |
57 | |
58 | my $document = PPI::Document->new(\$line); |
59 | return unless defined($document); |
60 | |
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61 | $document->prune('PPI::Token::Whitespace'); |
62 | |
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63 | my @matches = $self->complete($text, $document); |
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64 | |
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65 | # iterate through the completions |
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66 | if ($is_trp) { |
67 | return @matches; |
68 | } else { |
69 | return $self->term->completion_matches($text, sub { |
70 | my ($text, $state) = @_; |
71 | |
72 | if (!$state) { |
73 | $self->current_matches(\@matches); |
74 | $self->match_index(0); |
75 | } |
76 | else { |
77 | $self->match_index($self->match_index + 1); |
78 | } |
79 | |
80 | return $self->current_matches->[$self->match_index]; |
81 | }); |
82 | } |
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83 | } |
84 | |
85 | sub complete { |
86 | return (); |
87 | } |
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88 | |
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89 | # recursively find the last element |
90 | sub last_ppi_element { |
91 | my ($self, $document, $type) = @_; |
92 | my $last = $document; |
93 | while ($last->can('last_element') && defined($last->last_element)) { |
94 | $last = $last->last_element; |
95 | return $last if $type && $last->isa($type); |
96 | } |
97 | return $last; |
98 | } |
99 | |
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100 | 1; |
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101 | |
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102 | __END__ |
103 | |
104 | =head1 NAME |
105 | |
106 | Devel::REPL::Plugin::Completion - Extensible tab completion |
107 | |
30b459d4 |
108 | =head1 AUTHOR |
109 | |
110 | Shawn M Moore, C<< <sartak at gmail dot com> >> |
111 | |
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112 | =cut |
113 | |