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package Language::Basic::Variable; |
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# Part of Language::Basic by Amir Karger (See Basic.pm for details) |
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=pod |
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=head1 NAME |
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Language::Basic::Variable - Module to handle parsing and implementing |
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BASIC variables. |
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=head1 SYNOPSIS |
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See L for the overview of how the Language::Basic module |
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works. This pod page is more technical. |
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There are two sorts of variables: Arrays and Scalars. Each of those |
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classes has a subclass for Numeric or String variables. |
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=head1 DESCRIPTION |
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An Array needs to have full LBV::Scalar objects in it, rather than just |
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having an array of values. The reason is that, for example, you might |
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use ARR(3) as the variable in a FOR loop. Also, the "set" and "value" |
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methods apply to a LBV::Scalar (since you can't set an array to a value |
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(in BASIC :)) so in order to be handle A(3)=3, A(3) needs to be an LBV::Scalar. |
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The lookup method looks up a variable in the Array or Scalar lookup |
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table (depending on whether there were parentheses after the variable |
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name). BASIC allows undeclared variables, so if the variable name hasn't |
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been seen before, a new variable is created. |
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=cut |
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use strict; |
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# sub-packages |
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{ |
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package Language::Basic::Variable; |
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package Language::Basic::Variable::Numeric; |
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package Language::Basic::Variable::String; |
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package Language::Basic::Variable::Scalar; |
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package Language::Basic::Variable::Array; |
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} |
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# Hash storing the program's variables |
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my %Scalars; |
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my %Arrays; |
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# Look up a variable based on its name. |
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# Create a new Variable (Scalar or Array) if it doesn't yet exist. |
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# Arg0 is the name for the variable, Arg1 is defined if there were () after |
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# the name, i.e., if it's an array. For now, we don't care what's in the |
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# parens. |
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# Returns the Variable ref, whether or not it had to create a new one. |
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sub lookup { |
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my $name = shift; |
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my $arglist = shift; |
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if (defined($arglist)) { |
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unless (exists $Arrays{$name}) { |
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$Arrays{$name} = new Language::Basic::Variable::Array $name; |
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} |
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return $Arrays{$name}; |
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} else { |
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unless (exists $Scalars{$name}) { |
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$Scalars{$name} = new Language::Basic::Variable::Scalar $name; |
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} |
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return $Scalars{$name}; |
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} |
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} # end sub Language::Basic::Variable::lookup |
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###################################################################### |
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# package Language::Basic::Variable::Scalar |
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# |
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# Fields: |
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# value - the current value of the variable |
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# |
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=head2 Language::Basic::Variable::Scalar class |
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This class handles a variable or one cell in an array. |
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Methods include "value", which gets the variable's value, and "set", |
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which sets it. |
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=cut |
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{ |
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package Language::Basic::Variable::Scalar; |
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@Language::Basic::Variable::Scalar::ISA = qw(Language::Basic::Variable); |
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sub new { |
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my ($class, $name) = @_; |
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my $type = ($name =~ /\$$/) ? "String" : "Numeric"; |
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# Create a new subclass object, & return it |
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my $subclass = $class . "::$type"; |
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return (new $subclass); |
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} # end sub Language::Basic::Variable::new |
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# Set the variable to value arg1 |
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sub set { |
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my ($self, $value) = @_; |
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$self->{"value"} = $value; |
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} |
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sub value {return shift->{"value"} } |
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package Language::Basic::Variable::Scalar::String; |
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@Language::Basic::Variable::Scalar::String::ISA = |
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qw (Language::Basic::Variable::Scalar Language::Basic::Variable::String); |
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sub new { |
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my $class = shift; |
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my $value = ""; |
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my $self = { |
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"value" => $value, |
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}; |
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bless $self, $class; |
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} # end sub Language::Basic::Variable::Scalar::String::new |
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package Language::Basic::Variable::Scalar::Numeric; |
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@Language::Basic::Variable::Scalar::Numeric::ISA = |
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qw (Language::Basic::Variable::Scalar Language::Basic::Variable::Numeric); |
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sub new { |
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my $class = shift; |
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my $value = 0; |
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my $self = { |
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"value" => $value, |
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}; |
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bless $self, $class; |
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} # end sub Language::Basic::Variable::Scalar::Numeric::new |
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} # end package Language::Basic::Variable::Scalar |
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###################################################################### |
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# |
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# Fields: |
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# cells - list (of lists, for 2- or more dimensional arrays) of |
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# Language::Basic::Variable::Scalar objects holding the actual values |
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# for each index |
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=head2 Language::Basic::Variable::Array class |
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This class handles a BASIC array. Each cell in the array is a LBV::Scalar |
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object. |
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Methods include "dimension", which dimensions the array to a given size (or |
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a default size) and get_cell, which returns the LBV::Scalar object in a |
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given array location. |
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Note that BASIC arrays start from 0! |
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=cut |
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{ |
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package Language::Basic::Variable::Array; |
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@Language::Basic::Variable::Array::ISA = qw(Language::Basic::Variable); |
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use Language::Basic::Common; |
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# Fields: |
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# cells - holds the LBV::Scalar::* objects in the array |
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# Note that this returns subclasses of LBVA (String or Numeric) |
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sub new { |
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my ($class, $name) = @_; |
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my $self = { |
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"cells" => [], |
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}; |
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my $type = ($name =~ /\$$/) ? "String" : "Numeric"; |
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my $subclass = $class . "::$type"; |
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bless $self, $subclass; |
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# Dimension the array to its default size |
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$self->dimension; |
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return $self; |
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} # end sub Language::Basic::Variable::Array::new |
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# Make room in the array |
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# Input: Optionally, a list of sizes for each dimension. Otherwise, a |
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# one-dimensional array of default size is dimensioned. |
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# Error: Exit with error if the array will be too big. |
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sub dimension { |
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my $MAXDIM = 100000; |
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my $self = shift; |
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my @Default = (10); |
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# TODO multi-dim arrays |
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my @sizes = @_ ? @_ : @Default; |
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my $size = 1; |
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for (@sizes) {$size *= ($_+1)} |
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if ($size > $MAXDIM) |
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{&Exit_Error("Array size may not be greater than $MAXDIM")} |
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my $subclass = ref($self); |
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$subclass =~ s/Array/Scalar/; |
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$self->{"cells"} = &lol($subclass, @sizes); |
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$self->{"dimensions"} = \@sizes; |
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} # end sub Language::Basic::Variable::Array::dimension |
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sub lol { |
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# create a list of lists of arg0 objects, dimensions arg1-n |
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my ($subclass, @sizes) = @_; |
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if (@sizes) { |
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#recurse |
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my $size = shift(@sizes); |
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my @arr = map {&lol($subclass, @sizes)} (0 .. $size); |
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return \@arr; |
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} else { |
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# end recursion |
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# '$subclass->new' because 'new $subclass' calls LBVA::new! |
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my $ret = $subclass->new; |
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return $ret; |
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} |
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} # end sub Language::Basic::Variable::Array::lol |
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# Get one cell of an array |
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# Input: a list of array indices |
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# Output: the Language::Basic::Variable::Scalar at that location in the array |
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sub get_cell { |
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54
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54
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75
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my $self = shift; |
222
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54
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79
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my @indices = @_; |
223
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54
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52
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my @sizes = @{$self->{"dimensions"}}; |
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54
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113
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224
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54
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50
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240
|
unless (@sizes == @indices) {Exit_Error("Wrong number of indices!")} |
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0
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0
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225
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226
|
54
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|
87
|
my $ptr = $self->{"cells"}; |
227
|
54
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|
|
85
|
foreach my $index (@indices) { |
228
|
58
|
|
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|
74
|
my $size = shift(@sizes); |
229
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|
|
# index can't be negative or greater than the array size |
230
|
58
|
50
|
33
|
|
|
408
|
if ($index !~ /^\d+$/ || $index > $size) { |
231
|
0
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|
|
|
|
0
|
&Exit_Error ("Illegal array indexing '@indices'") |
232
|
|
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|
|
|
} |
233
|
58
|
|
|
|
|
168
|
$ptr = $ptr->[$index]; |
234
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|
|
} |
235
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|
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|
236
|
54
|
|
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|
103
|
my $c = ref($ptr); |
237
|
54
|
50
|
|
|
|
203
|
warn "Weird class $c" unless $ptr->isa("Language::Basic::Variable::Scalar"); |
238
|
54
|
|
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|
|
309
|
return $ptr; |
239
|
|
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|
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|
|
} # end sub Language::Basic::Variable::Array::get_cell |
240
|
|
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241
|
|
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|
|
package Language::Basic::Variable::Array::Numeric; |
242
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|
|
@Language::Basic::Variable::Array::Numeric::ISA = |
243
|
|
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|
|
qw (Language::Basic::Variable::Array Language::Basic::Variable::Numeric); |
244
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|
|
package Language::Basic::Variable::Array::String; |
245
|
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|
|
@Language::Basic::Variable::Array::String::ISA = |
246
|
|
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|
|
qw (Language::Basic::Variable::Array Language::Basic::Variable::String); |
247
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|
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|
|
} # end package Language::Basic::Variable::Array |
248
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249
|
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|
{ |
250
|
|
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|
|
# set ISA for "return type" classes |
251
|
|
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|
|
package Language::Basic::Variable::Numeric; |
252
|
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|
|
@Language::Basic::Variable::Numeric::ISA = qw |
253
|
|
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|
|
(Language::Basic::Variable Language::Basic::Numeric); |
254
|
|
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|
|
package Language::Basic::Variable::String; |
255
|
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|
|
@Language::Basic::Variable::String::ISA = qw |
256
|
|
|
|
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|
|
(Language::Basic::Variable Language::Basic::String); |
257
|
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|
|
} |
258
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|
|
1; # end package Language::Basic::Variable |