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############################################################################### |
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# |
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# This file copyright (c) 2001 by Randy J. Ray, all rights reserved |
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# |
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# Copying and distribution are permitted under the terms of the Artistic |
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# License as distributed with Perl versions 5.005 and later. See |
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# http://language.perl.com/misc/Artistic.html |
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# |
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############################################################################### |
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# |
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# $Id: Parser.pm,v 1.4 2002/05/22 09:44:49 rjray Exp $ |
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# |
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# Description: This is the RPC::XML::Parser class, a container for the |
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# XML::Parser class. It was moved here from RPC::XML in |
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# order to reduce the weight of that module. |
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# |
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# Functions: new |
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# parse |
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# message_init |
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# tag_start |
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# error |
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# stack_error |
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# tag_end |
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# char_data |
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# |
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# Libraries: RPC::XML |
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# XML::Parser |
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# |
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# Global Consts: Uses $RPC::XML::ERROR |
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# |
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# Environment: None. |
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# |
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############################################################################### |
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|
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package RPC::XML::Parser; |
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|
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use 5.005; |
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use strict; |
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use vars qw($VERSION @ISA); |
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use subs qw(error stack_error new message_init message_end tag_start tag_end |
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char_data parse); |
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|
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# These constants are only used by the internal stack machine |
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use constant PARSE_ERROR => 0; |
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use constant METHOD => 1; |
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use constant METHODSET => 2; |
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use constant RESPONSE => 3; |
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use constant RESPONSESET => 4; |
| 49 |
use constant STRUCT => 5; |
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use constant ARRAY => 6; |
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use constant DATATYPE => 7; |
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use constant ATTR_SET => 8; |
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use constant METHODNAME => 9; |
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use constant VALUEMARKER => 10; |
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use constant PARAMSTART => 11; |
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use constant PARAM => 12; |
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use constant STRUCTMEM => 13; |
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use constant STRUCTNAME => 14; |
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use constant DATAOBJECT => 15; |
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use constant PARAMLIST => 16; |
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use constant NAMEVAL => 17; |
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use constant MEMBERENT => 18; |
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use constant METHODENT => 19; |
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use constant RESPONSEENT => 20; |
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use constant FAULTENT => 21; |
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use constant FAULTSTART => 22; |
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|
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# This is to identify valid types |
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use constant VALIDTYPES => { map { $_, 1 } qw(int i4 string double reference |
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boolean dateTime.iso8601 |
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base64) }; |
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# This maps XML tags to stack-machine tokens |
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use constant TAG2TOKEN => { methodCall => METHOD, |
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methodResponse => RESPONSE, |
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methodName => METHODNAME, |
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params => PARAMSTART, |
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param => PARAM, |
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value => VALUEMARKER, |
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fault => FAULTSTART, |
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array => ARRAY, |
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struct => STRUCT, |
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member => STRUCTMEM, |
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name => STRUCTNAME }; |
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|
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use XML::Parser; |
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|
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require RPC::XML; |
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|
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$VERSION = do { my @r=(q$Revision: 1.4 $=~/\d+/g); sprintf "%d."."%02d"x$#r,@r }; |
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|
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1; |
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|
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############################################################################### |
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# |
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# Sub Name: new |
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# |
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# Description: Constructor. Save any important attributes, leave the |
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# heavy lifting for the parse() routine and XML::Parser. |
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# |
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# Arguments: NAME IN/OUT TYPE DESCRIPTION |
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# $class in scalar Class we're initializing |
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# %attr in hash Any extras the caller wants |
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# |
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# Globals: $RPC::XML::ERROR |
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# |
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# Environment: None. |
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# |
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# Returns: Success: object ref |
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# Failure: undef |
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# |
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############################################################################### |
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sub new |
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{ |
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my $class = shift; |
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my %attrs = @_; |
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|
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my $self = {}; |
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if (keys %attrs) |
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{ |
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for (keys %attrs) { $self->{$_} = $attrs{$_} } |
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} |
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|
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bless $self, $class; |
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} |
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|
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############################################################################### |
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# |
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# Sub Name: parse |
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# |
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# Description: Parse the requested string or stream. This behaves mostly |
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# like parse() in the XML::Parser namespace, but does some |
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# extra, as well. |
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# |
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# Arguments: NAME IN/OUT TYPE DESCRIPTION |
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# $self in ref Object of this class |
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# $stream in scalar Either the string to parse or |
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# an open filehandle of sorts |
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# |
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# Globals: None. |
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# |
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# Environment: None. |
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# |
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# Returns: Success: ref to request or response object |
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# Failure: error string |
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# |
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############################################################################### |
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sub parse |
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{ |
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my $self = shift; |
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my $stream = shift; |
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|
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my $parser = XML::Parser->new(Namespaces => 0, ParseParamEnt => 0, |
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Handlers => |
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{ |
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Init => sub { message_init $self, @_ }, |
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Start => sub { tag_start $self, @_ }, |
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End => sub { tag_end $self, @_ }, |
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Char => sub { char_data $self, @_ }, |
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}); |
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|
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eval { $parser->parse($stream) }; |
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return $@ if $@; |
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# Look at the top-most marker, it'll need to be one of the end cases |
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my $marker = pop(@{$self->{stack}}); |
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# There should be only on item on the stack after it |
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my $retval = pop(@{$self->{stack}}); |
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# If the top-most marker isn't the error marker, check the stack |
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$retval = 'RPC::XML Error: Extra data on parse stack at document end' |
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if ($marker != PARSE_ERROR and (@{$self->{stack}})); |
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|
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$retval; |
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} |
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|
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# This is called when a new document is about to start parsing |
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sub message_init |
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{ |
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my $robj = shift; |
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my $self = shift; |
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|
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$robj->{stack} = []; |
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$self; |
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} |
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|
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# This gets called each time an opening tag is parsed |
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sub tag_start |
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{ |
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my $robj = shift; |
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my $self = shift; |
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my $elem = shift; |
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my %attr = @_; |
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|
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$robj->{cdata} = ''; |
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return if ($elem eq 'data'); |
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if (TAG2TOKEN->{$elem}) |
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{ |
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push(@{$robj->{stack}}, TAG2TOKEN->{$elem}); |
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} |
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elsif (VALIDTYPES->{$elem}) |
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{ |
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# All datatypes are represented on the stack by this generic token |
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push(@{$robj->{stack}}, DATATYPE); |
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} |
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else |
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{ |
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push(@{$robj->{stack}}, |
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"Unknown tag encountered: $elem", PARSE_ERROR); |
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$self->finish; |
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} |
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} |
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|
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# Very simple error-text generator, just to eliminate heavy reduncancy in the |
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# next sub: |
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sub error |
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{ |
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my $robj = shift; |
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my $self = shift; |
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my $mesg = shift; |
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my $elem = shift || ''; |
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|
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my $fmt = $elem ? |
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'%s at document line %d, column %d (byte %d, closing tag %s)' : |
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'%s at document line %d, column %d (byte %d)'; |
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|
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push(@{$robj->{stack}}, |
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sprintf($fmt, $mesg, $self->current_line, $self->current_column, |
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$self->current_byte, $elem), |
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PARSE_ERROR); |
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$self->finish; |
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} |
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|
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# A shorter-cut for stack integrity errors |
| 232 |
sub stack_error |
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{ |
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my $robj = shift; |
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my $self = shift; |
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my $elem = shift; |
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|
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error($robj, $self, 'Stack corruption detected', $elem); |
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} |
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|
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# This is a hairy subroutine-- what to do at the end-tag. The actions range |
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# from simply new-ing a datatype all the way to building the final object. |
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sub tag_end |
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{ |
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my $robj = shift; |
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my $self = shift; |
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my $elem = shift; |
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|
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my ($op, $attr, $obj, $class, $list, $name, $err); |
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|
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return if ($elem eq 'data'); |
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# This should always be one of the stack machine ops defined above |
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$op = pop(@{$robj->{stack}}); |
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|
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# Decide what to do from here |
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if (VALIDTYPES->{$elem}) |
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{ |
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# This is the closing tag of one of the data-types. |
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($class = lc $elem) =~ s/\./_/; |
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# Some minimal data-integrity checking |
| 261 |
if ($class eq 'int' or $class eq 'i4') |
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{ |
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return error($robj, $self, 'Bad integer data read') |
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unless ($robj->{cdata} =~ /^[-+]?\d+$/); |
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} |
| 266 |
elsif ($class eq 'double') |
| 267 |
{ |
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return error($robj, $self, 'Bad floating-point data read') |
| 269 |
unless ($robj->{cdata} =~ |
| 270 |
# Taken from perldata(1) |
| 271 |
/^([+-]?)(?=\d|\.\d)\d*(\.\d*)?([Ee]([+-]?\d+))?$/); |
| 272 |
} |
| 273 |
|
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$class = "RPC::XML::$class"; |
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$obj = $class->new($robj->{cdata}); |
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return error($robj, $self, 'Error instantiating data object: ' . |
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$RPC::XML::ERROR) |
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unless ($obj); |
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push(@{$robj->{stack}}, $obj, DATAOBJECT); |
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} |
| 281 |
elsif ($elem eq 'value') |
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{ |
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# For <value></value>, there should already be a dataobject, or else |
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# the marker token in which case the CDATA is used as a string value. |
| 285 |
if ($op == DATAOBJECT) |
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{ |
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($op, $obj) = splice(@{$robj->{stack}}, -2); |
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return stack_error($robj, $self, $elem) |
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unless ($op == VALUEMARKER); |
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} |
| 291 |
elsif ($op == VALUEMARKER) |
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{ |
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$obj = RPC::XML::string->new($robj->{cdata}); |
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} |
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else |
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{ |
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return error($robj, $self, |
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'No datatype found within <value> container'); |
| 299 |
} |
| 300 |
|
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push(@{$robj->{stack}}, $obj, DATAOBJECT); |
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} |
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elsif ($elem eq 'param') |
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{ |
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# Almost like above, since this is really a NOP anyway |
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return error($robj, $self, 'No <value> found within <param> container') |
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unless ($op == DATAOBJECT); |
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($op, $obj) = splice(@{$robj->{stack}}, -2); |
| 309 |
return stack_error($robj, $self, $elem) unless ($op == PARAM); |
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push(@{$robj->{stack}}, $obj, DATAOBJECT); |
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} |
| 312 |
elsif ($elem eq 'params') |
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{ |
| 314 |
# At this point, there should be zero or more DATAOBJECT tokens on the |
| 315 |
# stack, each with a data object right below it. |
| 316 |
$list = []; |
| 317 |
return stack_error($robj, $self, $elem) |
| 318 |
unless ($op == DATAOBJECT or $op == PARAMSTART); |
| 319 |
while ($op == DATAOBJECT) |
| 320 |
{ |
| 321 |
unshift(@$list, pop(@{$robj->{stack}})); |
| 322 |
$op = pop(@{$robj->{stack}}); |
| 323 |
} |
| 324 |
# Now that we see something ! DATAOBJECT, it needs to be PARAMSTART |
| 325 |
return stack_error($robj, $self, $elem) unless ($op == PARAMSTART); |
| 326 |
push(@{$robj->{stack}}, $list, PARAMLIST); |
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} |
| 328 |
elsif ($elem eq 'fault') |
| 329 |
{ |
| 330 |
# If we're finishing up a fault definition, there needs to be a struct |
| 331 |
# on the stack. |
| 332 |
return stack_error($robj, $self, $elem) unless ($op == DATAOBJECT); |
| 333 |
($op, $obj) = splice(@{$robj->{stack}}, -2); |
| 334 |
return error($robj, $self, |
| 335 |
'Only a <struct> value may be within a <fault>') |
| 336 |
unless ($obj->isa('RPC::XML::struct')); |
| 337 |
|
| 338 |
$obj = RPC::XML::fault->new($obj); |
| 339 |
return error($robj, $self, 'Unable to instantiate fault object: ' . |
| 340 |
$RPC::XML::ERROR) |
| 341 |
unless $obj; |
| 342 |
push(@{$robj->{stack}}, $obj, FAULTENT); |
| 343 |
} |
| 344 |
elsif ($elem eq 'member') |
| 345 |
{ |
| 346 |
# We need to see a DATAOBJECT followed by a STRUCTNAME |
| 347 |
return stack_error($robj, $self, $elem) unless ($op == DATAOBJECT); |
| 348 |
($op, $obj) = splice(@{$robj->{stack}}, -2); |
| 349 |
return stack_error($robj, $self, $elem) unless ($op == STRUCTNAME); |
| 350 |
# Get the name off the stack to clear the way for the STRUCTMEM marker |
| 351 |
# under it |
| 352 |
($op, $name) = splice(@{$robj->{stack}}, -2); |
| 353 |
# Push the name back on, with the value and the new marker (STRUCTMEM) |
| 354 |
push(@{$robj->{stack}}, $name, $obj, STRUCTMEM); |
| 355 |
} |
| 356 |
elsif ($elem eq 'name') |
| 357 |
{ |
| 358 |
# Fairly simple: just push the current content of CDATA on w/ a marker |
| 359 |
push(@{$robj->{stack}}, $robj->{cdata}, STRUCTNAME); |
| 360 |
} |
| 361 |
elsif ($elem eq 'struct') |
| 362 |
{ |
| 363 |
# Create the hash table in-place, then pass the ref to the constructor |
| 364 |
$list = {}; |
| 365 |
# First off the stack needs to be STRUCTMEM or STRUCT |
| 366 |
return stack_error($robj, $self, $elem) |
| 367 |
unless ($op == STRUCTMEM or $op == STRUCT); |
| 368 |
while ($op == STRUCTMEM) |
| 369 |
{ |
| 370 |
# Next on stack (in list-order): name, value |
| 371 |
($name, $obj) = splice(@{$robj->{stack}}, -2); |
| 372 |
$list->{$name} = $obj; |
| 373 |
$op = pop(@{$robj->{stack}}); |
| 374 |
} |
| 375 |
# Now that we see something ! STRUCTMEM, it needs to be STRUCT |
| 376 |
return stack_error($robj, $self, $elem) unless ($op == STRUCT); |
| 377 |
$obj = RPC::XML::struct->new($list); |
| 378 |
return error($robj, $self, |
| 379 |
'Error creating a RPC::XML::struct object: ' . |
| 380 |
$RPC::XML::ERROR) |
| 381 |
unless $obj; |
| 382 |
push(@{$robj->{stack}}, $obj, DATAOBJECT); |
| 383 |
} |
| 384 |
elsif ($elem eq 'array') |
| 385 |
{ |
| 386 |
# This is similar in most ways to struct creation, save for the lack |
| 387 |
# of naming for the elements. |
| 388 |
# Create the list in-place, then pass the ref to the constructor |
| 389 |
$list = []; |
| 390 |
# Only DATAOBJECT or ARRAY should be visible |
| 391 |
return stack_error($robj, $self, $elem) |
| 392 |
unless ($op == DATAOBJECT or $op == ARRAY); |
| 393 |
while ($op == DATAOBJECT) |
| 394 |
{ |
| 395 |
unshift(@$list, pop(@{$robj->{stack}})); |
| 396 |
$op = pop(@{$robj->{stack}}); |
| 397 |
} |
| 398 |
# Now that we see something ! DATAOBJECT, it needs to be ARRAY |
| 399 |
return stack_error($robj, $self, $elem) unless ($op == ARRAY); |
| 400 |
$obj = RPC::XML::array->new($list); |
| 401 |
return error($robj, $self, |
| 402 |
'Error creating a RPC::XML::array object: ' . |
| 403 |
$RPC::XML::ERROR) |
| 404 |
unless $obj; |
| 405 |
push(@{$robj->{stack}}, $obj, DATAOBJECT); |
| 406 |
} |
| 407 |
elsif ($elem eq 'methodName') |
| 408 |
{ |
| 409 |
return error($robj, $self, |
| 410 |
"<$elem> tag must immediately follow a <methodCall> tag") |
| 411 |
unless ($robj->{stack}->[$#{$robj->{stack}}] == METHOD); |
| 412 |
push(@{$robj->{stack}}, $robj->{cdata}, NAMEVAL); |
| 413 |
} |
| 414 |
elsif ($elem eq 'methodCall') |
| 415 |
{ |
| 416 |
# A methodCall closing should have on the stack an optional PARAMLIST |
| 417 |
# marker, a NAMEVAL marker, then the METHOD token from the |
| 418 |
# opening tag. An ATTR_SET may follow the METHOD token. |
| 419 |
if ($op == PARAMLIST) |
| 420 |
{ |
| 421 |
($op, $list) = splice(@{$robj->{stack}}, -2); |
| 422 |
} |
| 423 |
else |
| 424 |
{ |
| 425 |
$list = []; |
| 426 |
} |
| 427 |
if ($op == NAMEVAL) |
| 428 |
{ |
| 429 |
($op, $name) = splice(@{$robj->{stack}}, -2); |
| 430 |
} |
| 431 |
return error($robj, $self, |
| 432 |
"No methodName tag detected during methodCall parsing") |
| 433 |
unless $name; |
| 434 |
return stack_error($robj, $self, $elem) unless ($op == METHOD); |
| 435 |
# Create the request object and push it on the stack |
| 436 |
$obj = RPC::XML::request->new($name, @$list); |
| 437 |
return error($robj, $self, |
| 438 |
"Error creating request object: $RPC::XML::ERROR") |
| 439 |
unless $obj; |
| 440 |
push(@{$robj->{stack}}, $obj, METHODENT); |
| 441 |
} |
| 442 |
elsif ($elem eq 'methodResponse') |
| 443 |
{ |
| 444 |
# A methodResponse closing should have on the stack only the |
| 445 |
# DATAOBJECT marker, then the RESPONSE token from the opening tag. |
| 446 |
if ($op == PARAMLIST) |
| 447 |
{ |
| 448 |
# To my knowledge, the XML-RPC spec limits the params list for |
| 449 |
# a response to exactly one object. Extract it from the listref |
| 450 |
# and put it back. |
| 451 |
$list = pop(@{$robj->{stack}}); |
| 452 |
return error($robj, $self, |
| 453 |
"Params list for <$elem> tag invalid") |
| 454 |
unless (@$list == 1); |
| 455 |
$obj = $list->[0]; |
| 456 |
return error($robj, $self, |
| 457 |
"Returned value on stack not a type reference") |
| 458 |
unless (ref $obj and $obj->isa('RPC::XML::datatype')); |
| 459 |
push(@{$robj->{stack}}, $obj); |
| 460 |
} |
| 461 |
elsif (! ($op == DATAOBJECT or $op == FAULTENT)) |
| 462 |
{ |
| 463 |
return error($robj, $self, |
| 464 |
"No parameter was declared for the <$elem> tag"); |
| 465 |
} |
| 466 |
($op, $list) = splice(@{$robj->{stack}}, -2); |
| 467 |
return stack_error($robj, $self, $elem) unless ($op == RESPONSE); |
| 468 |
# Create the response object and push it on the stack |
| 469 |
$obj = RPC::XML::response->new($list); |
| 470 |
return error($robj, $self, |
| 471 |
"Error creating response object: $RPC::XML::ERROR") |
| 472 |
unless $obj; |
| 473 |
push(@{$robj->{stack}}, $obj, RESPONSEENT); |
| 474 |
} |
| 475 |
} |
| 476 |
|
| 477 |
# This just spools the character data until a closing tag makes use of it |
| 478 |
sub char_data |
| 479 |
{ |
| 480 |
my $robj = shift; |
| 481 |
my $self = shift; |
| 482 |
my $data = shift; |
| 483 |
|
| 484 |
$robj->{cdata} .= $data; |
| 485 |
} |
| 486 |
|
| 487 |
__END__ |
| 488 |
|
| 489 |
=head1 NAME |
| 490 |
|
| 491 |
RPC::XML::Parser - A container class for XML::Parser |
| 492 |
|
| 493 |
=head1 SYNOPSIS |
| 494 |
|
| 495 |
use RPC::XML::Parser; |
| 496 |
... |
| 497 |
$P = RPC::XML::Parser->new(); |
| 498 |
$P->parse($message); |
| 499 |
|
| 500 |
=head1 DESCRIPTION |
| 501 |
|
| 502 |
The B<RPC::XML::Parser> class encapsulates the parsing process, for turning a |
| 503 |
string or an input stream into a B<RPC::XML::request> or B<RPC::XML::response> |
| 504 |
object. The B<XML::Parser> class is used internally, with a new instance |
| 505 |
created for each call to C<parse> (detailed below). This allows the |
| 506 |
B<RPC::XML::Parser> object to be reusable, even though the B<XML::Parser> |
| 507 |
objects are not. The methods are: |
| 508 |
|
| 509 |
=over 4 |
| 510 |
|
| 511 |
=item new |
| 512 |
|
| 513 |
Create a new instance of the class. Any extra data passed to the constructor |
| 514 |
is taken as key/value pairs (B<not> a hash reference) and attached to the |
| 515 |
object. |
| 516 |
|
| 517 |
=item parse { STRING | STREAM } |
| 518 |
|
| 519 |
Parse the XML document specified in either a string or a stream. The stream |
| 520 |
may be any file descriptor, derivative of B<IO::Handle>, etc. The return |
| 521 |
value is either an object reference (to one of B<RPC::XML::request> or |
| 522 |
B<RPC::XML::response>) or an error string. Any non-reference return value |
| 523 |
should be treated as an error condition. |
| 524 |
|
| 525 |
=back |
| 526 |
|
| 527 |
=head1 DIAGNOSTICS |
| 528 |
|
| 529 |
The constructor returns C<undef> upon failure, with the error message available |
| 530 |
in the global variable B<C<$RPC::XML::ERROR>>. |
| 531 |
|
| 532 |
=head1 CAVEATS |
| 533 |
|
| 534 |
This began as a reference implementation in which clarity of process and |
| 535 |
readability of the code took precedence over general efficiency. It is now |
| 536 |
being maintained as production code, but may still have parts that could be |
| 537 |
written more efficiently. |
| 538 |
|
| 539 |
=head1 CREDITS |
| 540 |
|
| 541 |
The B<XML-RPC> standard is Copyright (c) 1998-2001, UserLand Software, Inc. |
| 542 |
See <http://www.xmlrpc.com> for more information about the B<XML-RPC> |
| 543 |
specification. |
| 544 |
|
| 545 |
=head1 LICENSE |
| 546 |
|
| 547 |
This module is licensed under the terms of the Artistic License that covers |
| 548 |
Perl. See <http://language.perl.com/misc/Artistic.html> for the |
| 549 |
license itself. |
| 550 |
|
| 551 |
=head1 SEE ALSO |
| 552 |
|
| 553 |
L<RPC::XML>, L<RPC::XML::Client>, L<RPC::XML::Server>, L<XML::Parser> |
| 554 |
|
| 555 |
=head1 AUTHOR |
| 556 |
|
| 557 |
Randy J. Ray <rjray@blackperl.com> |
| 558 |
|
| 559 |
=cut |
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