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# xmldep.tcl --
#
# Find the dependencies in an XML document.
# Supports external entities and XSL include/import.
#
# TODO:
# XInclude
#
# Copyright (c) 2001-2003 Zveno Pty Ltd
# http://www.zveno.com/
#
# See the file "LICENSE" in this distribution for information on usage and
# redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# $Id: xmldep.tcl,v 1.3 2006-12-19 13:27:09 matben Exp $
package require xml
package provide xml::dep 1.0
namespace eval xml::dep {
namespace export depend
variable extEntities
array set extEntities {}
variable XSLTNS http://www.w3.org/1999/XSL/Transform
}
# xml::dep::depend --
#
# Find the resources which an XML document
# depends on. The document is parsed
# sequentially, rather than using DOM, for efficiency.
#
# TODO:
# Asynchronous parsing.
#
# Arguments:
# xml XML document entity
# args configuration options
#
# Results:
# Returns list of resource (system) identifiers
proc xml::dep::depend {xml args} {
variable resources
variable entities
set resources {}
catch {unset entities}
array set entities {}
set p [xml::parser \
-elementstartcommand [namespace code ElStart] \
-doctypecommand [namespace code DocTypeDecl] \
-entitydeclcommand [namespace code EntityDecl] \
-entityreferencecommand [namespace code EntityReference] \
-validate 1 \
]
if {[llength $args]} {
eval [list $p] configure $args
}
$p parse $xml
return $resources
}
# xml::dep::ElStart --
#
# Process start element
#
# Arguments:
# name tag name
# atlist attribute list
# args options
#
# Results:
# May add to resources list
proc xml::dep::ElStart {name atlist args} {
variable XSLTNS
variable resources
array set opts {
-namespace {}
}
array set opts $args
switch -- $opts(-namespace) \
$XSLTNS {
switch $name {
import -
include {
array set attr {
href {}
}
array set attr $atlist
if {[string length $attr(href)]} {
if {[lsearch $resources $attr(href)] < 0} {
lappend resources $attr(href)
}
}
}
}
}
}
# xml::dep::DocTypeDecl --
#
# Process Document Type Declaration
#
# Arguments:
# name Document element
# pubid Public identifier
# sysid System identifier
# dtd Internal DTD Subset
#
# Results:
# Resource added to list
proc xml::dep::DocTypeDecl {name pubid sysid dtd} {
variable resources
puts stderr [list DocTypeDecl $name $pubid $sysid dtd]
if {[string length $sysid] && \
[lsearch $resources $sysid] < 0} {
lappend resources $sysid
}
return {}
}
# xml::dep::EntityDecl --
#
# Process entity declaration, looking for external entity
#
# Arguments:
# name entity name
# sysid system identifier
# pubid public identifier or repl. text
#
# Results:
# Store external entity info for later reference
proc xml::dep::EntityDecl {name sysid pubid} {
variable extEntities
puts stderr [list EntityDecl $name $sysid $pubid]
set extEntities($name) $sysid
}
# xml::dep::EntityReference --
#
# Process entity reference
#
# Arguments:
# name entity name
#
# Results:
# May add to resources list
proc xml::dep::EntityReference name {
variable extEntities
variable resources
puts stderr [list EntityReference $name]
if {[info exists extEntities($name)] && \
[lsearch $resources $extEntities($name)] < 0} {
lappend resources $extEntities($name)
}
}
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