/usr/share/tcltk/tcllib1.19/oometa/oometa.tcl is in tcllib 1.19-dfsg-2.
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# Author: Sean Woods, yoda@etoyoc.com
##
# TclOO routines to implement property tracking by class and object
###
package require Tcl 8.6 ;# tailcall
package require dicttool
package provide oo::meta 0.7.1
namespace eval ::oo::meta {
variable dirty_classes {}
variable core_classes {::oo::class ::oo::object}
}
proc ::oo::meta::args_to_dict args {
if {[llength $args]==1} {
return [lindex $args 0]
}
return $args
}
proc ::oo::meta::args_to_options args {
set result {}
foreach {var val} [args_to_dict {*}$args] {
lappend result [string trimleft $var -] $val
}
return $result
}
proc ::oo::meta::ancestors class {
variable core_classes
set class [::oo::meta::normalize $class]
set core_result {}
set queue $class
set result {}
# Rig things such that that the top superclasses
# are evaluated first
while {[llength $queue]} {
set tqueue $queue
set queue {}
foreach qclass $tqueue {
if {$qclass in $core_classes} {
if {$qclass ni $core_result} {
lappend core_result $qclass
}
continue
}
foreach aclass [::info class superclasses $qclass] {
if { $aclass in $result } continue
if { $aclass in $core_result } continue
if { $aclass in $queue } continue
lappend queue $aclass
}
}
foreach item $tqueue {
if {$item in $core_result} continue
if { $item ni $result } {
set result [linsert $result 0 $item]
}
}
}
# Handle core classes last
set queue $core_result
while {[llength $queue]} {
set tqueue $queue
set queue {}
foreach qclass $tqueue {
foreach aclass [::info class superclasses $qclass] {
if { $aclass in $result } continue
if { $aclass in $queue } continue
lappend queue $aclass
}
}
foreach item $tqueue {
if { $item ni $result } {
set result [linsert $result 0 $item]
}
}
}
return $result
}
proc oo::meta::info {class submethod args} {
set class [::oo::meta::normalize $class]
switch $submethod {
cget {
###
# submethod: cget
# arguments: ?*path* ...? *field*
# format: markdown
# description:
# Retrieve a value from the class' meta data. Values are searched in the
# following order:
# 1. From class meta data as const **path** **field:**
# 2. From class meta data as const **path** **field**
# 3. From class meta data as **path** **field:**
# 4. From class meta data as **path** **field**
###
set path [lrange $args 0 end-1]
set field [string trimright [lindex $args end] :]
foreach mclass [lreverse [::oo::meta::ancestors $class]] {
if {![::info exists ::oo::meta::local_property($mclass)]} continue
set class_metadata $::oo::meta::local_property($mclass)
if {[dict exists $class_metadata const {*}$path $field:]} {
return [dict get $class_metadata const {*}$path $field:]
}
if {[dict exists $class_metadata const {*}$path $field]} {
return [dict get $class_metadata const {*}$path $field]
}
if {[dict exists $class_metadata {*}$path $field:]} {
return [dict get $class_metadata {*}$path $field:]
}
if {[dict exists $class_metadata {*}$path $field]} {
return [dict get $class_metadata {*}$path $field]
}
}
return {}
}
rebuild {
::oo::meta::rebuild $class
}
is {
set info [metadata $class]
return [string is [lindex $args 0] -strict [dict getnull $info {*}[lrange $args 1 end]]]
}
for -
map {
set info [metadata $class]
uplevel 1 [list ::dict $submethod [lindex $args 0] [dict get $info {*}[lrange $args 1 end-1]] [lindex $args end]]
}
with {
upvar 1 TEMPVAR info
set info [metadata $class]
return [uplevel 1 [list ::dict with TEMPVAR {*}$args]]
}
branchget {
set info [metadata $class]
set result {}
foreach {field value} [dict getnull $info {*}$args] {
dict set result [string trimright $field :] $value
}
return $result
}
branchset {
::oo::meta::rebuild $class
foreach {field value} [lindex $args end] {
::dict set ::oo::meta::local_property($class) {*}[lrange $args 0 end-1] [string trimright $field :]: $value
}
}
leaf_add {
if {[::info exists ::oo::meta::local_property($class)]} {
set result [dict getnull $::oo::meta::local_property($class) {*}[lindex $args 0]]
}
ladd result {*}[lrange $args 1 end]
dict set ::oo::meta::local_property($class) {*}[lindex $args 0] $result
}
leaf_remove {
if {![::info exists ::oo::meta::local_property($class)]} return
set result {}
forearch element [dict getnull $::oo::meta::local_property($class) {*}[lindex $args 0]] {
if { $element in [lrange $args 1 end]} continue
lappend result $element
}
dict set ::oo::meta::local_property($class) {*}[lindex $args 0] $result
}
append -
incr -
lappend -
set -
unset -
update {
::oo::meta::rebuild $class
::dict $submethod ::oo::meta::local_property($class) {*}$args
}
merge {
::oo::meta::rebuild $class
set ::oo::meta::local_property($class) [dict rmerge $::oo::meta::local_property($class) {*}$args]
}
dump {
set info [metadata $class]
return $info
}
default {
set info [metadata $class]
return [::dict $submethod $info {*}$args]
}
}
}
proc ::oo::meta::localdata {class args} {
if {![::info exists ::oo::meta::local_property($class)]} {
return {}
}
if {[::llength $args]==0} {
return $::oo::meta::local_property($class)
}
return [::dict getnull $::oo::meta::local_property($class) {*}$args]
}
proc ::oo::meta::normalize class {
set class ::[string trimleft $class :]
}
proc ::oo::meta::metadata {class {force 0}} {
set class [::oo::meta::normalize $class]
###
# Destroy the cache of all derivitive classes
###
if {$force} {
unset -nocomplain ::oo::meta::cached_property
unset -nocomplain ::oo::meta::cached_hierarchy
} else {
variable dirty_classes
foreach dclass $dirty_classes {
foreach {cclass cancestors} [array get ::oo::meta::cached_hierarchy] {
if {$dclass in $cancestors} {
unset -nocomplain ::oo::meta::cached_property($cclass)
unset -nocomplain ::oo::meta::cached_hierarchy($cclass)
}
}
if {![::info exists ::oo::meta::local_property($dclass)]} continue
if {[dict getnull $::oo::meta::local_property($dclass) classinfo type:] eq "core"} {
if {$dclass ni $::oo::meta::core_classes} {
lappend ::oo::meta::core_classes $dclass
}
}
}
set dirty_classes {}
}
###
# If the cache is available, use it
###
variable cached_property
if {[::info exists cached_property($class)]} {
return $cached_property($class)
}
###
# Build a cache of the hierarchy and the
# aggregate metadata for this class and store
# them for future use
###
variable cached_hierarchy
set metadata {}
set stack {}
variable local_property
set cached_hierarchy($class) [::oo::meta::ancestors $class]
foreach class $cached_hierarchy($class) {
if {[::info exists local_property($class)]} {
lappend metadata $local_property($class)
}
}
#foreach aclass [lreverse [::info class superclasses $class]] {
# lappend metadata [::oo::meta::metadata $aclass]
#}
lappend metadata {classinfo {type: {}}}
if {[::info exists local_property($class)]} {
lappend metadata $local_property($class)
}
set metadata [dict rmerge {*}$metadata]
set cached_property($class) $metadata
return $metadata
}
proc ::oo::meta::rebuild args {
foreach class $args {
if {$class ni $::oo::meta::dirty_classes} {
lappend ::oo::meta::dirty_classes $class
}
}
}
proc ::oo::meta::search args {
variable local_property
set path [lrange $args 0 end-1]
set value [lindex $args end]
set result {}
foreach {class info} [array get local_property] {
if {[dict exists $info {*}$path:]} {
if {[string match [dict get $info {*}$path:] $value]} {
lappend result $class
}
continue
}
if {[dict exists $info {*}$path]} {
if {[string match [dict get $info {*}$path] $value]} {
lappend result $class
}
}
}
return $result
}
proc ::oo::define::meta {args} {
set class [lindex [::info level -1] 1]
if {[lindex $args 0] in "cget set branchset"} {
::oo::meta::info $class {*}$args
} else {
::oo::meta::info $class set {*}$args
}
}
oo::define oo::class {
method meta {submethod args} {
tailcall ::oo::meta::info [self] $submethod {*}$args
}
}
oo::define oo::object {
###
# title: Provide access to meta data
# format: markdown
# description:
# The *meta* method allows an object access
# to a combination of its own meta data as
# well as to that of its class
###
method meta {submethod args} {
my variable meta MetaMixin
if {![info exists MetaMixin]} {
set MetaMixin {}
}
set class [::info object class [self object]]
set classlist [list $class {*}$MetaMixin]
switch $submethod {
cget {
###
# submethod: cget
# arguments: ?*path* ...? *field*
# format: markdown
# description:
# Retrieve a value from the local objects **meta** dict
# or from the class' meta data. Values are searched in the
# following order:
# 0. (If path length==1) From the _config array
# 1. From the local dict as **path** **field:**
# 2. From the local dict as **path** **field**
# 3. From class meta data as const **path** **field:**
# 4. From class meta data as const **path** **field**
# 5. From class meta data as **path** **field:**
# 6. From class meta data as **path** **field**
###
set path [lrange $args 0 end-1]
set field [string trim [lindex $args end] :]
if {[dict exists $meta {*}$path $field:]} {
return [dict get $meta {*}$path $field:]
}
if {[dict exists $meta {*}$path $field]} {
return [dict get $meta {*}$path $field]
}
foreach mclass [lreverse $classlist] {
set class_metadata [::oo::meta::metadata $mclass]
if {[dict exists $class_metadata const {*}$path $field:]} {
return [dict get $class_metadata const {*}$path $field:]
}
if {[dict exists $class_metadata const {*}$path $field]} {
return [dict get $class_metadata const {*}$path $field]
}
if {[dict exists $class_metadata {*}$path $field:]} {
return [dict get $class_metadata {*}$path $field:]
}
if {[dict exists $class_metadata {*}$path $field]} {
return [dict get $class_metadata {*}$path $field]
}
}
return {}
}
is {
set value [my meta cget {*}[lrange $args 1 end]]
return [string is [lindex $args 0] -strict $value]
}
for -
map {
foreach mclass $classlist {
lappend mdata [::oo::meta::metadata $mclass]
}
set info [dict rmerge {*}$mdata $meta]
uplevel 1 [list ::dict $submethod [lindex $args 0] [dict get $info {*}[lrange $args 1 end-1]] [lindex $args end]]
}
with {
upvar 1 TEMPVAR info
foreach mclass $classlist {
lappend mdata [::oo::meta::metadata $mclass]
}
set info [dict rmerge {*}$mdata $meta]
return [uplevel 1 [list dict with TEMPVAR {*}$args]]
}
dump {
foreach mclass $classlist {
lappend mdata [::oo::meta::metadata $mclass]
}
return [dict rmerge {*}$mdata $meta]
}
append -
incr -
lappend -
set -
unset -
update {
return [dict $submethod meta {*}$args]
}
branchset {
foreach {field value} [lindex $args end] {
dict set meta {*}[lrange $args 0 end-1] [string trimright $field :]: $value
}
}
rmerge -
merge {
set meta [dict rmerge $meta {*}$args]
return $meta
}
exists {
foreach mclass $classlist {
if {[dict exists [::oo::meta::metadata $mclass] {*}$args]} {
return 1
}
}
if {[dict exists $meta {*}$args]} {
return 1
}
return 0
}
get -
getnull {
if {[string index [lindex $args end] end]==":"} {
# Looking for a leaf node
if {[dict exists $meta {*}$args]} {
return [dict get $meta {*}$args]
}
foreach mclass [lreverse $classlist] {
set mdata [::oo::meta::metadata $mclass]
if {[dict exists $mdata {*}$args]} {
return [dict get $mdata {*}$args]
}
}
if {$submethod == "get"} {
error "key \"$args\" not known in metadata"
}
return {}
}
# Looking for a branch node
# So we need to composite the result
set found 0
foreach mclass $classlist {
set mdata [::oo::meta::metadata $mclass]
if {[dict exists $mdata {*}$args]} {
set found 1
lappend result [dict get $mdata {*}$args]
}
}
if {[dict exists $meta {*}$args]} {
set found 1
lappend result [dict get $meta {*}$args]
}
if {!$found} {
if {$submethod == "get"} {
error "key \"$args\" not known in metadata"
}
return {}
}
return [dict rmerge {*}$result]
}
branchget {
set result {}
foreach mclass [lreverse $classlist] {
foreach {field value} [dict getnull [::oo::meta::metadata $mclass] {*}$args] {
dict set result [string trimright $field :] $value
}
}
foreach {field value} [dict getnull $meta {*}$args] {
dict set result [string trimright $field :] $value
}
return $result
}
mixin {
foreach mclass $args {
set mclass [::oo::meta::normalize $mclass]
if {$mclass ni $MetaMixin} {
lappend MetaMixin $mclass
}
}
}
mixout {
foreach mclass $args {
set mclass [::oo::meta::normalize $mclass]
while {[set i [lsearch $MetaMixin $mclass]]>=0} {
set MetaMixin [lreplace $MetaMixin $i $i]
}
}
}
default {
foreach mclass $classlist {
lappend mdata [::oo::meta::metadata $mclass]
}
set info [dict rmerge {*}$mdata $meta]
return [dict $submethod $info {*}$args]
}
}
}
}
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