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# -*- tcl -*-
#
# Copyright (c) 2005 by Andreas Kupries <andreas_kupries@users.sourceforge.net>
# Parser Generator / Backend - PEG as Tcl script.
# ### ### ### ######### ######### #########
## Requisites
package require page::util::peg
namespace eval ::page::gen::peg::cpkg {
# Get various utilities.
namespace import ::page::util::peg::*
}
# ### ### ### ######### ######### #########
## API
proc ::page::gen::peg::cpkg {t chan} {
cpkg::printWarnings [cpkg::getWarnings $t]
set grname [$t get root name]
cpkg::Header $chan $grname
set gstart [$t get root start]
if {$gstart ne ""} {
set gstart [cpkg::peOf $t $gstart]
} else {
puts stderr "No start expression."
}
cpkg::Start $chan $gstart
set temp {}
set max -1
foreach {sym def} [$t get root definitions] {
set eroot [lindex [$t children $def] 0]
set l [string length [list $sym]]
if {$l > $max} {set max $l}
lappend temp \
[list $sym [$t get $def mode] [cpkg::peOf $t $eroot] $l]
}
foreach e [lsort -dict -index 0 $temp] {
foreach {sym mode rule l} $e break
cpkg::Rule $chan $sym $mode $rule [expr {$max - $l}]
}
cpkg::Trailer $chan $grname
return
}
# ### ### ### ######### ######### #########
## Internal. Helpers
proc ::page::gen::peg::cpkg::Header {chan grname} {
variable header
variable headerb
set stem [namespace tail $grname]
puts $chan [string map \
[list \
@@ [list $grname] \
@stem@ [list $stem] \
"\n\t" "\n"
] \
$header\n$headerb]
}
proc ::page::gen::peg::cpkg::Start {chan pe} {
puts $chan " Start [printTclExpr $pe]\n"
return
}
proc ::page::gen::peg::cpkg::Rule {chan sym mode pe off} {
variable ms
set off [string repeat " " $off]
puts $chan " Define $ms($mode) $sym$off [printTclExpr $pe]"
return
}
proc ::page::gen::peg::cpkg::Trailer {chan grname} {
variable trailer
variable trailerb
puts $chan [string map \
[list \
@@ [list $grname] \
"\n\t" "\n"
] \
$trailer\n$trailerb]
}
# ### ### ### ######### ######### #########
## Internal. Strings.
namespace eval ::page::gen::peg::cpkg {
variable ms ; array set ms {
value {value }
discard {discard}
match {match }
leaf {leaf }
}
variable header {# -*- tcl -*-
## Parsing Expression Grammar '@@'.
# ### ### ### ######### ######### #########
## Package description
## It provides a single command returning the handle of a
## grammar container in which the grammar '@@'
## is stored. The container is usable by a PEG interpreter
## or other packages taking PE grammars.
# ### ### ### ######### ######### #########
## Requisites.
## - PEG container type
package require grammar::peg
namespace eval ::@@ {}
# ### ### ### ######### ######### #########
## API
proc ::@@ {} {
return $@stem@::gr
}
# ### ### ### ######### ######### #########
# ### ### ### ######### ######### #########
## Data and helpers.
namespace eval ::@@ {
# Grammar container
variable gr [::grammar::peg gr]
}
proc ::@@::Start {pe} {
variable gr
$gr start $pe
return
}
proc ::@@::Define {mode sym pe} {
variable gr
$gr nonterminal add $sym $pe
$gr nonterminal mode $sym $mode
return
}
# ### ### ### ######### ######### #########
## Initialization = Grammar definition
}
variable headerb "namespace eval ::@@ \{"
variable trailer "\}"
variable trailerb {
# ### ### ### ######### ######### #########
## Package Management - Ready
package provide @@ 0.1
}
}
# ### ### ### ######### ######### #########
## Ready
package provide page::gen::peg::cpkg 0.1
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