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package WWW::Webrobot::SymbolTable; |
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use strict; |
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use warnings; |
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# Author: Stefan Trcek |
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# Copyright(c) 2004 ABAS Software AG |
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use Carp; |
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=head1 NAME |
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WWW::Webrobot::SymbolTable - Symbol table for Webrobot properties |
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=head1 SYNOPSIS |
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use WWW::Webrobot::SymbolTable; |
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my $symbols = WWW::Webrobot::SymbolTable -> new(); |
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=head1 DESCRIPTION |
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=head1 METHODS |
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=over |
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=item new |
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Constructor |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = bless({}, ref($class) || $class); |
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$self->{_symbols} = {}; |
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$self->{_scope} = [{}]; |
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return $self; |
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} |
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=item $symbols->push_scope() |
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Open a new scope for symbols. |
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=cut |
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sub push_scope { |
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my ($self) = @_; |
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push @{$self->{_scope}}, {}; |
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} |
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=item $symbols->pop_scope() |
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Close (delete) the last scope, delete all symbols in this scope. |
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=cut |
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sub pop_scope { |
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my ($self) = @_; |
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my $scope = $self->{_scope}; |
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my $symbols = $self->{_symbols}; |
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foreach (keys %{$scope->[-1]}) { |
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pop @{$symbols->{$_}}; |
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delete $symbols->{$_} if scalar @{$symbols->{$_}} == 0; |
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} |
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pop @$scope; |
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} |
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=item $symbols->define_symbol($name, $value) |
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Define a symbol in the current scope. |
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=cut |
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sub define_symbol { |
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my ($self, $l, $r) = @_; |
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my $symbols = $self->{_symbols}; |
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my $last_scope = $self->{_scope}->[-1]; |
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# was: my $entry = [$l, $r || "", qr/(?
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my $entry = $r || ""; |
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if ($last_scope->{$l}) { # entry exists in last scope, overwrite |
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$symbols->{$l}->[-1] = $entry; |
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} |
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else { # no entry yet |
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$last_scope->{$l} = 1; |
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push @{$symbols->{$l}}, $entry; |
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} |
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} |
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# private |
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sub _evaluate_string { |
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my ($self, $str) = @_; |
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return undef if !defined $str; |
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my $symbols = $self->{_symbols}; |
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$str =~ s/ \${ ([^}]+) } / $symbols->{$1} ? $symbols->{$1}->[-1] : "\${$1}" /gex; |
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return $str; |
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} |
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=item $symbols->evaluate($string) |
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Evaluate all symbols in a string. |
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The symbol variables must obey the syntax C<${name}>. |
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Returns the evaluated string. |
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=cut |
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sub evaluate { |
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my ($self, $entry) = @_; |
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SWITCH: foreach (ref $entry) { |
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/^HASH$/ and do { |
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foreach my $key (keys %$entry) { |
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# substitute value |
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if (ref $entry->{$key}) { |
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$self -> evaluate($entry->{$key}); |
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} |
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else { |
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my $tmp = $entry->{$key}; |
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$self -> evaluate(\$tmp); |
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$entry->{$key} = $tmp; |
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} |
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# substitute key |
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my $nkey = $key; |
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$self -> evaluate(\$nkey); |
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if ($key ne $nkey) { |
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$entry->{$nkey} = delete $entry->{$key}; |
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} |
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} |
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last; |
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}; |
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/^ARRAY$/ and do { |
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foreach my $e (@$entry) { |
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$self -> evaluate((ref $e) ? $e : \$e); |
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} |
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last; |
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}; |
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/^SCALAR$/ and do { |
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$$entry = $self->_evaluate_string($$entry); |
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last; |
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}; |
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/^$/ and do { |
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$entry = $self->_evaluate_string($entry); |
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last; |
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} |
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# ??? missing error handling |
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# my $ref = ref $entry; |
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# die "ARRAY or HASH expected, found $ref"; |
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} |
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return $entry; |
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} |
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=back |
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=cut |
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1; |