302 lines
8.3 KiB
Perl
302 lines
8.3 KiB
Perl
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#!/usr/bin/perl
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#
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package S2::NodeVarRef;
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use strict;
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use S2::Node;
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use S2::NodeExpr;
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use S2::Type;
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use vars qw($VERSION @ISA $LOCAL $OBJECT $PROPERTY);
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$LOCAL = 1;
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$OBJECT = 2;
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$PROPERTY = 3;
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$VERSION = '1.0';
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@ISA = qw(S2::Node);
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sub new {
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my ($class) = @_;
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my $n = new S2::Node;
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bless $n, $class;
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}
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sub canStart {
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my ($class, $toker) = @_;
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return $toker->peek() == $S2::TokenPunct::DOLLAR;
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}
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sub parse {
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my ($class, $toker) = @_;
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my $n = new S2::NodeVarRef();
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$n->{'levels'} = [];
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$n->{'type'} = $LOCAL;
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# voo-doo so tokenizer won't continue parsing a string
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# if we're in a string and trying to parse interesting things
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# involved in a VarRef:
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$n->setStart($n->requireToken($toker, $S2::TokenPunct::DOLLAR, 0));
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$toker->pushInString(0); # pretend we're not, even if we are.
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if ($toker->peekChar() eq "{") {
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$n->requireToken($toker, $S2::TokenPunct::LBRACE, 0);
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$n->{'braced'} = 1;
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} else {
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$n->{'braced'} = 0;
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}
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if ($toker->peekChar() eq ".") {
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$n->requireToken($toker, $S2::TokenPunct::DOT, 0);
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$n->{'type'} = $OBJECT;
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} elsif ($toker->peekChar() eq "*") {
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$n->requireToken($toker, $S2::TokenPunct::MULT, 0);
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$n->{'type'} = $PROPERTY;
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}
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my $requireDot = 0;
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# only peeking at characters, not tokens, otherwise
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# we could force tokens could be created in the wrong
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# context.
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while ($toker->peekChar() =~ /[a-zA-Z\_\.]/)
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{
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if ($requireDot) {
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$n->requireToken($toker, $S2::TokenPunct::DOT, 0);
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} else {
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$requireDot = 1;
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}
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my $ident = $n->getIdent($toker, 1, 0);
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my $vl = {
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'var' => $ident->getIdent(),
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'derefs' => [],
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};
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# more preventing of token peeking:
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while ($toker->peekChar() eq '[' ||
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$toker->peekChar() eq '{')
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{
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my $dr = {}; # Deref, 'type', 'expr'
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my $t = $n->eatToken($toker, 0);
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if ($t == $S2::TokenPunct::LBRACK) {
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$dr->{'type'} = '[';
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$n->addNode($dr->{'expr'} = S2::NodeExpr->parse($toker));
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$n->requireToken($toker, $S2::TokenPunct::RBRACK, 0);
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} elsif ($t == $S2::TokenPunct::LBRACE) {
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$dr->{'type'} = '{';
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$n->addNode($dr->{'expr'} = S2::NodeExpr->parse($toker));
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$n->requireToken($toker, $S2::TokenPunct::RBRACE, 0);
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} else {
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die;
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}
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push @{$vl->{'derefs'}}, $dr;
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}
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push @{$n->{'levels'}}, $vl;
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} # end while
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# did we parse just $ ?
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S2::error($n, "Malformed variable reference") unless
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@{$n->{'levels'}};
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if ($n->{'braced'}) {
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# false argument necessary to prevent peeking at token
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# stream while it's in the interpolated variable parsing state,
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# else the string text following the variable would be
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# treated as if it were outside the string.
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$n->requireToken($toker, $S2::TokenPunct::RBRACE, 0);
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}
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$toker->popInString(); # back to being in a string if we were
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# now we must skip white space that requireToken above would've
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# done had we not told it not to, but not if the main tokenizer
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# is in a quoted string
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if ($toker->{'inString'} == 0) {
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$n->skipWhite($toker);
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}
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return $n;
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}
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# if told by NodeTerm.java, add another varlevel to point to
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# this object's $.as_string
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sub useAsString {
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my $this = shift;
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push @{$this->{'levels'}}, {
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'var' => 'as_string',
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'derefs' => [],
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};
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}
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sub isHashElement {
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my $this = 0;
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return 0 unless @{$this->{'levels'}};
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my $l = $this->{'levels'}->[-1];
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return 0 unless @$l;
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my $d = $l->[-1];
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return $d->{'type'} eq "{";
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}
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sub getType {
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my ($this, $ck, $wanted) = @_;
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if (defined $wanted) {
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my $t = getType($this, $ck);
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return $t unless
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$wanted->equals($S2::Type::STRING);
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my $type = $t->toString();
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if ($ck->classHasAsString($type)) {
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$this->{'useAsString'} = 1;
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return $S2::Type::STRING;
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}
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}
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# must have at least reference something.
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return undef unless @{$this->{'levels'}};
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my @levs = @{$this->{'levels'}};
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my $lev = shift @levs; # VarLevel
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my $vart = undef; # Type
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# properties
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if ($this->{'type'} == $PROPERTY) {
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$vart = $ck->propertyType($lev->{'var'});
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S2::error($this, "Unknown property") unless $vart;
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$vart = $vart->clone();
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}
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# local variables.
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if ($this->{'type'} == $LOCAL) {
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$vart = $ck->localType($lev->{'var'});
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S2::error($this, "Unknown local variable \$$lev->{'var'}") unless $vart;
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}
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# properties & locals
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if ($this->{'type'} == $PROPERTY ||
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$this->{'type'} == $LOCAL)
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{
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$vart = $vart->clone();
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# dereference [] and {} stuff
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$this->doDerefs($ck, $lev->{'derefs'}, $vart);
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# if no more levels, return now. otherwise deferencing
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# happens below.
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return $vart unless @levs;
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$lev = shift @levs;
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}
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# initialize the name of the current object
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if ($this->{'type'} == $OBJECT) {
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my $curclass = $ck->getCurrentFunctionClass();
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S2::error($this, "Can't reference member variable in non-class function") unless $curclass;
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$vart = new S2::Type($curclass);
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}
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while ($lev) {
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my $nc = $ck->getClass($vart->toString());
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S2::error($this, "Can't use members of an undefined class") unless $nc;
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$vart = $nc->getMemberType($lev->{'var'});
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S2::error($this, "Can't find member '$lev->{'var'}' in " . $nc->getName()) unless $vart;
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$vart = $vart->clone();
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# dereference [] and {} stuff
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$this->doDerefs($ck, $lev->{'derefs'}, $vart);
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$lev = shift @levs;
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}
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return $vart;
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}
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# private
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sub doDerefs {
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my ($this, $ck, $derefs, $vart) = @_;
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foreach my $d (@{$derefs}) {
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my $et = $d->{'expr'}->getType($ck);
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if ($d->{'type'} eq "{") {
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S2::error($this, "Can't dereference a non-hash as a hash")
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unless $vart->isHashOf();
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S2::error($this, "Must dereference a hash with a string or int")
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unless ($et->equals($S2::Type::STRING) ||
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$et->equals($S2::Type::INT));
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$vart->removeMod(); # not a hash anymore
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} elsif ($d->{'type'} eq "[") {
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S2::error($this, "Can't dereference a non-array as an array ")
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unless $vart->isArrayOf();
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S2::error($this, "Must dereference an array with an int")
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unless $et->equals($S2::Type::INT);
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$vart->removeMod(); # not an array anymore
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}
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}
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}
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# is this variable $super ?
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sub isSuper {
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my ($this) = @_;
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return 0 if $this->{'type'} != $LOCAL;
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return 0 if @{$this->{'levels'}} > 1;
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my $v = $this->{'levels'}->[0];
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return ($v->{'var'} eq "super" &&
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@{$v->{'derefs'}} == 0);
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}
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sub asS2 {
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my ($this, $o) = @_;
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die "Unported";
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}
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sub asPerl {
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my ($this, $bp, $o) = @_;
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my $first = 1;
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if ($this->{'type'} == $LOCAL) {
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$o->write("\$");
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} elsif ($this->{'type'} == $OBJECT) {
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$o->write("\$this");
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} elsif ($this->{'type'} == $PROPERTY) {
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$o->write("\$_ctx->[PROPS]");
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$first = 0;
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}
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foreach my $lev (@{$this->{'levels'}}) {
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if (! $first || $this->{'type'} == $OBJECT) {
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$o->write("->{'$lev->{'var'}'}");
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} else {
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my $v = $lev->{'var'};
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if ($first && $this->{'type'} == $LOCAL &&
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$v eq "super") {
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$v = "this";
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}
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$o->write($v);
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$first = 0;
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}
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foreach my $d (@{$lev->{'derefs'}}) {
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$o->write("->$d->{'type'}"); # [ or {
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$d->{'expr'}->asPerl($bp, $o);
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$o->write($d->{'type'} eq "[" ? "]" : "}");
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}
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} # end levels
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if ($this->{'useAsString'}) {
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$o->write("->{'as_string'}");
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}
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}
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sub isProperty {
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my $this = shift;
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return $this->{'type'} == $PROPERTY;
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}
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sub propName {
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my $this = shift;
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return "" unless $this->{'type'} == $PROPERTY;
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return $this->{'levels'}->[0]->{'var'};
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}
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