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# peg_from_json.tcl --
#
# Conversion to PEG from JSON (Java Script Object Notation).
#
# 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_from_json.tcl,v 1.1 2010/03/26 05:07:24 andreas_kupries Exp $
# This package takes text in JSON format (Java Script data transfer
# format) and produces the canonical serialization of a parsing
# expression grammar.
# ### ### ### ######### ######### #########
## Requisites
package require Tcl 8.5
package require pt::peg ; # Verification that the input is proper.
package require json
# ### ### ### ######### ######### #########
##
namespace eval ::pt::peg::from::json {
namespace export convert
namespace ensemble create
}
# ### ### ### ######### ######### #########
## API.
proc ::pt::peg::from::json::convert {text} {
# Note: We cannot fail here on duplicate keys in the input, as we
# do for Tcl-based canonical PEG serializations, because our
# underlying JSON parser automatically merges them, by taking only
# the last found definition. I.e. of two or more definitions for
# some key X the last overwrites all previous occurences.
return [pt::peg canonicalize [json::json2dict $text]]
}
# ### ### ### ######### ######### #########
## Ready
package provide pt::peg::from::json 1
return
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