hi coinop, I have a decent list of parser links you can check out,
mud.co.uk/richard/commpars.htm
groups.google.com/group/rec.arts … ode=source
https://intfiction.org/t/experimental-parser/3475/1
tads.org/t3doc/doc/libref/so … ser.t.html
dnd.utwente.nl/~krimud/Docs/NMAdmin/Parser/
groups.google.com/forum/?fromgr … f5y25xk7MJ
groups.google.com/forum/?fromgr … 5CEQvZCGsJ
ifwiki.org/index.php/Past_raif_t … _2#Parsing
groups.google.com/forum/?fromgr … JPrqQ8l9u0
kotancode.com/2012/02/15/sca … -java-nlp/
groups.google.com/forum/?fromgr … o4Ut4r_qCs
effbot.org/zone/simple-top-down-parsing.htm
skotos.net/articles/dawnof09.shtml
skotos.net/articles/dawnof22.shtml
discworld.starturtle.net/lpc/pla … pts/parser
disinterest.org/resource/MUD-Dev … 10160.html
The skotos articles and the one at Richard Bartle’s homepage itself are very thorough. Also there’s one in rec.arts.int-fiction at google groups that explains it well.