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# pt_peg_export.tcl --
#
# Exporting parsing expression grammars into other formats.
#
# Copyright (c) 2009 Andreas Kupries <andreas_kupries@sourceforge.net>
#
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
# RCS: @(#) $Id: pt_peg_export.tcl,v 1.1 2010/03/26 05:07:24 andreas_kupries Exp $
# Each object manages a set of plugins for the conversion of parsing
# expression grammars into some textual representation. I.e. this
# object manages the conversion to specialized serializations of
# parsing expression grammars.
# ### ### ### ######### ######### #########
## Requisites
package require Tcl 8.5
package require configuration
package require pt::peg
package require pluginmgr
package require snit
# ### ### ### ######### ######### #########
## API
snit::type ::pt::peg::export {
# ### ### ### ######### ######### #########
## Options :: None
# ### ### ### ######### ######### #########
## Creation, destruction.
constructor {} {
install myconfig using ::configuration ${selfns}::CONFIG
return
}
destructor {
$myconfig destroy
# Clear the cache of loaded export plugins.
foreach k [array names myplugin] {
$myplugin($k) destroy
}
return
}
# ### ### ### ######### ######### #########
## Convert from the Tcl index serialization to other formats.
method {export object} {obj {format {}}} {
return [$self export serial [$obj serialize] $format]
}
method {export serial} {serial {format {}}} {
set serial [pt::peg canonicalize $serial]
set plugin [$self GetPlugin $format]
# We have a plugin, now feed it.
set configuration [$myconfig get]
return [$plugin do export $serial $configuration]
}
# ### ### ### ######### ######### #########
## Internal methods
method GetPlugin {format} {
if {$format eq {}} { set format text }
if {![info exists myplugin($format)]} {
set plugin [pluginmgr ${selfns}::fmt-$format \
-pattern pt::peg::export::* \
-api { export } \
-setup [mymethod PluginSetup]]
::pluginmgr::paths $plugin pt::peg::export
$plugin load $format
set myplugin($format) $plugin
} else {
set plugin $myplugin($format)
}
return $plugin
}
method PluginSetup {mgr ip} {
# Inject a pseudo package into the plugin interpreter the
# formatters can use to check that they were loaded into a
# proper environment.
$ip eval {package provide pt::peg::export::plugin 1}
return
}
# ### ### ### ######### ######### #########
## State
# Array serving as a cache for the various plugin managers holding
# a specific export plugin.
variable myplugin -array {}
# A component managing the configuration given to the export
# plugins when they are invoked.
component myconfig -public configuration
##
# ### ### ### ######### ######### #########
}
# ### ### ### ######### ######### #########
## Ready
package provide pt::peg::export 1
return
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