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# -*- tcl -*-
# -- $Id: reader_peg.tcl,v 1.1 2005/09/28 04:51:22 andreas_kupries Exp $ ---
#
# PAGE plugin - reader - PEG ~ Parsing Expression Grammar
#
# ### ### ### ######### ######### #########
## Imported API
# -----------------+--
# page_read | Access to the input stream.
# page_read_done |
# page_eof |
# -----------------+--
# page_info | Reporting to the user.
# page_warning |
# page_error |
# -----------------+--
# page_log_error | Reporting of internals.
# page_log_warning |
# page_log_info |
# -----------------+--
# ### ### ### ######### ######### #########
## Exported API
# -----------------+--
# page_rfeature | Query for special plugin features page might wish to use.
# page_rtime | Activate collection of timing statistics.
# page_rgettime | Return the collected timing statistics.
# page_rlabel | User readable label for the plugin.
# page_rhelp | Doctools help text for plugin.
# page_roptions | Options understood by plugin.
# page_rconfigure | Option (re)configuration.
# page_rdata | External access to processed input stream.
# page_rrun | Process input stream per plugin configuration and hardwiring.
# -----------------+--
# ### ### ### ######### ######### #########
## Requisites
package require page::util::norm::peg ; # Normalize AST generated by reader of PEG grammars
package require page::parse::peg ; # Mengine based parser for PE grammars.
package require struct::tree ; # Data structure.
package require grammar::me::util ; # AST conversion
global usec
global timed
set timed 0
global cline
global ccol
# ### ### ### ######### ######### #########
## Implementation of exported API
proc page_rlabel {} {
return {Parsing Expression Grammar}
}
proc page_rfeature {key} {
return [string eq $key timeable]
}
proc page_rtime {} {
global timed
set timed 1
return
}
proc page_rgettime {} {
global usec
return $usec
}
proc page_rhelp {} {
return {}
}
proc page_roptions {} {
return {}
}
proc page_rconfigure {option value} {
return -code error "Cannot set value of unknown option \"$option\""
}
## proc page_rdata {} {}
## Created in 'Initialize'
proc page_rrun {} {
global timed usec cline ccol
page_log_info "reader/peg/run/parse"
set ast {}
set err {}
# Location of the next character to be read.
set cline 1
set ccol 0
if {$timed} {
set usec [lindex [time {
set ok [::page::parse::peg::parse ::Next err ast]
}] 0] ; #{}
} else {
set ok [::page::parse::peg::parse ::Next err ast]
}
page_read_done
page_log_info "reader/peg/run/check-for-errors"
if {!$ok} {
foreach {olc messages} $err break
foreach {offset linecol} $olc break
foreach {line col} $linecol break
set olc [string map {{ } _} \
[format %5d $line]]@[string map {{ } _} \
[format %3d $col]]/([format %5d $offset])
foreach m $messages {
page_log_error "reader/peg/run: $olc: $m"
page_error $m $linecol
}
page_log_info "reader/peg/run/failed"
return {}
}
page_log_info "reader/peg/run/ast-conversion"
struct::tree ::tree
::grammar::me::util::ast2etree $ast ::grammar::me::tcl ::tree
::page::util::norm::peg ::tree
set ast [::tree serialize]
::tree destroy
page_log_info "reader/peg/run/ok"
return $ast
}
# ### ### ### ######### ######### #########
## Internal helper code.
proc Next {} {
global cline ccol
if {[page_eof]} {return {}}
set ch [page_read 1]
if {$ch eq ""} {return {}}
set tok [list $ch {} $cline $ccol]
if {$ch eq "\n"} {
incr cline ; set ccol 0
} else {
incr ccol
}
return $tok
}
# ### ### ### ######### ######### #########
## Initialization
package provide page::reader::peg 0.1
|
