//Title: Nulliparous Type Paths
//Credit to: Jtgibson
//Contributed by: Jtgibson


/*
nul·lip·a·ra (nuh-lip'-er-uh)
- plural -a·rae (-uh-ree)

(obstetrics) a woman who has never borne a child.

nullipara. (n.d.). Dictionary.com Unabridged (v 1.1).
Retrieved April 03, 2008, http://dictionary.reference.com/browse/nullipara


These procs are intended to allow you to determine whether a type has no
child nodes, returning true if it does not.  For instance, the nulliparous
types are flagged by asterisks in the following example:

/mob
/mob/person
/mob/person/player *
/mob/person/nonplayer *
/mob/monster
/mob/monster/goblin
/mob/monster/goblin/green_goblin *
/mob/monster/goblin/red_goblin *
/mob/monster/hobgoblin *

Very handy for systems where you use types as "folders" instead of as
"generic" objects; only the nulliparous types in the above list should be
placeable on the map.
*/


//Returns 1 if the specified parameter is nulliparous, 0 otherwise.
proc/nulliparous(type)
    var/tmp/list/types = typesof(type); return (types.len == 1)


//Returns a list of all of the nulliparous types derived from the
// given type path (excluding the type itself).
proc/nulliparae(type)
    var/list/types = typesof(type) - type; . = list()
    for(var/nutype in types) if(nulliparous(nutype)) . += nutype



///*
//Testing code/sample implementation

//Asterisks have been placed for sake of example.  Any node without
// an asterisk will never show up as nulliparous.

mob
    person
        player // *
        nonplayer // *
    
    monster
        goblin
            green_goblin // *
            red_goblin // *
        
        hobgoblin // *
    
obj
    item
        equipment
            weapon
                sword
                    short_sword // *
                bow
                    long_bow // *
                    short_bow // *
                crossbow
                    heavy_crossbow // *
                    light_crossbow // *
                    shieldbow // *
            tool
                adze // *
                axe // *
                chisel // *
                drill // *
        article
            clothing
                shirt // *
                pants // *
            armour
                body
                    plate_mail // *
                    chain_mail // *
                legs
                    plate_leggings // *
                    chain_leggings // *


mob/verb/test_nulliparae(type in typesof(/datum))
    usr << "Nulliparae of [type]:"
    var/list/types = nulliparae(type)
    for(var/nutype in types)
        usr << nutype
    usr << "Total nulliparous / total derived nodes: [length(types)] / \
        [length(typesof(type) - type)]"
    usr << ""

mob/verb/test_nulliparous(type in typesof(/datum))
    if(nulliparous(type)) usr << "[type] is nulliparous"
    else usr << "[type] is not nulliparous"

//*/