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raze-gles/polymer/eduke32/source/lunatic/lunacon.lua
helixhorned f5ee6ca7eb Lunatic translator: nearing syntax completion while treading in murky waters. 
- bump lpeg stack limit to 1024 (hack) for long if/if/if...else chains
- lexical: newline, EOF and whitespace; "bad" identifiers; hex literals,
           newline terminated strings (allow empty string)
- syntax: allow nesting of array expressions, it's easier than special-casing;
          handle issues with structs expecting parm2 (hackish); userdef;
          switch/case/default
- fix parsing some commands; mind prefixes!
- frontend: if failing match, print last keyword and its position; warn on
  "bad" identifiers (one per such); batch processing from command line
- Files that locate finds from my linux box now pass (except where there are
  really syntax errors).

git-svn-id: https://svn.eduke32.com/eduke32@2616 1a8010ca-5511-0410-912e-c29ae57300e0
2012-04-29 20:54:06 +00:00

899 lines
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-- LunaCON CON to Lunatic translator
-- requires LPeg, http://www.inf.puc-rio.br/~roberto/lpeg/lpeg.html
local lpeg = require("lpeg")
-- If/else nesting is problematic in CON: because a dangling 'else' is attached
-- to the outermost 'if', I think there's no way of linearizing its (recursive)
-- pattern, so the "too many pending calls/choices" is unavoidable in general.
-- This limit is of course still arbitrary, but writing if/else cascades
-- in CON isn't pretty either (though sometimes necessary because nested switches
-- don't work?)
-- See also: http://lua-users.org/lists/lua-l/2010-03/msg00086.html
lpeg.setmaxstack(1024);
local Pat, Set, Range, Var = lpeg.P, lpeg.S, lpeg.R, lpeg.V
---- All keywords pattern -- needed for CON syntax
local con_keyword = dofile("con_lang.lua")
local function match_until(matchsp, untilsp) -- (!untilsp matchsp)* in PEG
-- sp: string or pattern
return (matchsp - Pat(untilsp))^0
end
----==== patterns ====----
---- basic ones
-- Windows, *nix and Mac newlines all exist in the wild!
local newline = "\r"*Pat("\n")^-1 + "\n"
local EOF = Pat(-1)
local anychar = Pat(1)
-- comments
local comment = "/*" * match_until(anychar, "*/") * "*/"
local linecomment = "//" * match_until(anychar, newline)
local whitespace = Var("whitespace")
local sp0 = whitespace^0
-- This "WS+" pattern matches EOF too, so that a forgotten newline at EOF is
-- properly handled
local sp1 = whitespace^1 + EOF
local alpha = Range("AZ", "az") -- locale?
local alphanum = alpha + Range("09")
--local alnumtok = alphanum + Set("{}/\\*-_.") -- see isaltok() in gamedef.c
--- basic lexical elements ("tokens")
local t_number = Range("09")^1 + (Pat("0x") + "0X")*Range("09", "af", "AF")^1
-- Valid identifier names are disjunct from keywords!
-- XXX: CON is more permissive with identifier name characters:
local t_identifier = Var("t_identifier")
-- This one matches keywords, too:
local t_identifier_all = Var("t_identifier_all")
local t_define = Var("t_define")
local t_filename = (anychar-Set(" \t\r\n"))^1 --alnumtok^1 -- XXX
local t_newline_term_str = match_until(anychar, newline)
-- new-style inline arrays and structures:
local t_arrayexp = Var("t_arrayexp")
-- defines and constants can take the place of vars that are only read:
local t_rvar = t_arrayexp + t_define
-- not so with written-to vars:
local t_wvar = t_arrayexp + t_identifier
---- helper patterns / pattern constructing functions
local maybe_quoted_filename = ('"' * t_filename * '"' + t_filename)
-- empty string is handled too; we must not eat the newline then!
local newline_term_string = (#newline + EOF) + (whitespace-newline)^1 * t_newline_term_str
-- (sp1 * t_define) repeated exactly n times
local function n_defines(n) -- works well only for small n
local pat = Pat(true)
for i=1,n do
pat = sp1 * t_define * pat
end
return pat
end
local D, R, W, I = -1, -2, -3, -4;
-- Generic command pattern, types given by varargs.
-- The command name to be matched is attached later.
-- Example:
-- "command" writtenvar readvar def def: gencmd(W,R,D,D)
-- --> sp1 * t_wvar * sp1 * t_rvar * sp1 * t_define * sp1 * t_define
-- "command_with_no_args": gencmd()
-- --> Pat(true)
local function cmd(...)
local pat = Pat(true)
local vartypes = {...}
local spat = ""
for i=1,#vartypes do
assert(vartypes[i] < 0)
if (vartypes[i] == D) then
pat = pat * sp1 * t_define
elseif (vartypes[i] == R) then
pat = pat * sp1 * t_rvar
elseif (vartypes[i] == W) then
pat = pat * sp1 * t_wvar
else -- I
assert(vartypes[i] == I)
pat = pat * sp1 * t_identifier
end
end
return pat
end
-- The command names will be attached to the front of the patterns later!
--== Top level CON commands ==--
-- XXX: many of these are also allowed inside actors/states/events in CON.
local Co = {
--- 1. Preprocessor
include = sp1 * maybe_quoted_filename,
includedefault = cmd(),
define = cmd(I,D),
--define = sp1 * t_identifier * sp1 * t_define,
--- 2. Defines and Meta-Settings
dynamicremap = cmd(),
setcfgname = sp1 * t_filename,
setdefname = sp1 * t_filename,
setgamename = newline_term_string,
precache = cmd(D,D,D),
scriptsize = cmd(D), -- unused
cheatkeys = cmd(D,D),
definecheat = newline_term_string, -- XXX: actually tricker syntax (TS)
definegamefuncname = newline_term_string, -- XXX: TS?
definegametype = n_defines(2) * newline_term_string,
definelevelname = n_defines(2) * newline_term_string, -- XXX: TS
defineskillname = sp1 * t_define * newline_term_string,
definevolumename = sp1 * t_define * newline_term_string,
definequote = sp1 * t_define * newline_term_string,
defineprojectile = cmd(D,D,D),
definesound = sp1 * t_define * sp1 * maybe_quoted_filename * n_defines(5), -- XXX: TS
-- XXX: need to see how that behaves with e.g. stuff like gamevar.ogg:
music = match_until(sp1 * t_filename, con_keyword),
--- 3. Game Settings
-- gamestartup has 25/29 fixed defines, depending on 1.3D/1.5 version:
gamestartup = (sp1 * t_define)^25 * (sp1 * t_define)^-4,
spritenopal = cmd(D),
spritenoshade = cmd(D),
spritenvg = cmd(D),
spriteshadow = cmd(D),
spriteflags = cmd(D,D), -- also see inner
--- 4. Game Variables / Arrays
gamevar = cmd(I,D,D),
gamearray = cmd(I,D),
--- 5. Top level commands that are also run-time commands
action = sp1 * t_identifier * (sp1 * t_define)^-5,
ai = sp1 * t_identifier * (sp1 * t_define)^0,
move = sp1 * t_identifier * (sp1 * t_define)^-2,
--- 6. Deprecated TLCs
betaname = newline_term_string,
enhanced = cmd(D),
}
--== Run time CON commands ==--
--- 1. Gamevar Operators
local varop = cmd(W,D)
local varvarop = cmd(W,R)
-- Allow nesting... stuff like
-- ifvarl actorvar[sprite[THISACTOR].owner].burning 0
-- is kinda breaking the classic "no array nesting" rules
-- (if there ever were any) and making our life harder else.
local arraypat = sp0 * "[" * sp0 * t_rvar * sp0 * "]"
-- Have to bite the bullet here and list actor/player members with second parameters,
-- even though it's ugly to make it part of the syntax. Also, stuff like
-- actor[xxx].loogiex parm2 x
-- will be wrongly accepted at the parsing stage because we don't discriminate between
-- actor and player (but it will be rejected later).
local parm2memberpat = (Pat("htg_t") + "loogiex" + "loogiey" + "ammo_amount" +
"weaprecs" + "gotweapon" + "pals" + "max_ammo_amount") * sp0 * t_rvar
-- The member name must match keywords, too (_all), because e.g. cstat is a member
-- of sprite[].
local memberpat = sp0 * "." * sp0 * (parm2memberpat + t_identifier_all)
local getstructcmd = -- get<structname>[<idx>].<member> (<parm2>)? <<var>>
-- existence of a second parameter is determined later
-- This is wrong, (sp1 id)? will match (sp1 wvar) if there's no 2nd param:
-- arraypat * memberpat * (sp1 * t_identifier)^-1 * sp1 * t_wvar
arraypat * memberpat * sp1 * (t_rvar * sp1 * t_wvar + t_wvar)
local setstructcmd = -- set<structname>[<idx>].<member> (<parm2>)? <var>
-- existence of a second parameter is determined later
arraypat * memberpat * sp1 * (t_rvar * sp1 * t_rvar + t_rvar)
local getperxvarcmd = -- get<actor/player>var[<idx>].<member> <<var>>
arraypat * memberpat * sp1 * t_wvar
local setperxvarcmd = -- set<actor/player>var[<idx>].<member> <var>
arraypat * memberpat * sp1 * t_rvar
local Ci = {
-- these can appear anywhere in the script
["break"] = cmd(),
["return"] = cmd(),
state = cmd(I),
--- 1. get*, set*
getactor = getstructcmd,
getinput = getstructcmd,
getplayer = getstructcmd,
getprojectile = getstructcmd,
getsector = getstructcmd,
getthisprojectile = getstructcmd,
gettspr = getstructcmd,
-- NOTE: {get,set}userdef is the only struct that can be accessed without
-- an "array part", e.g. H266mod has "setuserdef .weaponswitch 0" (space
-- between keyword and "." is mandatory)
getuserdef = (arraypat + sp1) * memberpat * sp1 * (t_rvar * sp1 * t_wvar + t_wvar),
-- getuserdef = getstructcmd,
getwall = getstructcmd,
getactorvar = getperxvarcmd,
getplayervar = getperxvarcmd,
setactor = setstructcmd,
setinput = setstructcmd,
setplayer = setstructcmd,
setprojectile = setstructcmd,
setsector = setstructcmd,
setthisprojectile = setstructcmd,
settspr = setstructcmd,
setuserdef = (arraypat + sp1) * memberpat * sp1 * (t_rvar * sp1 * t_wvar + t_rvar),
-- setuserdef = setstructcmd,
setwall = setstructcmd,
setactorvar = setperxvarcmd,
setplayervar = setperxvarcmd,
setsprite = cmd(R,R,R,R),
setvarvar = varvarop,
addvarvar = varvarop,
subvarvar = varvarop,
mulvarvar = varvarop,
divvarvar = varvarop,
modvarvar = varvarop,
andvarvar = varvarop,
orvarvar = varvarop,
xorvarvar = varvarop,
randvarvar = varvarop,
setvar = varop,
addvar = varop,
subvar = varop,
mulvar = varop,
divvar = varop,
modvar = varop,
andvar = varop,
orvar = varop,
xorvar = varop,
randvar = varop,
shiftvarl = varop,
shiftvarr = varop,
--- 2. Math operations
sqrt = cmd(R,W),
calchypotenuse = cmd(W,R,R),
sin = cmd(W,R),
cos = cmd(W,R),
mulscale = cmd(W,R,R,R),
getangle = cmd(W,R,R),
getincangle = cmd(W,R,R),
--- 3. Actors
-- These three need more attention (different kind of labels; move
-- additionally may accept 0 or 1):
action = cmd(D),
ai = cmd(D),
move = sp1 * t_define * (sp1 * t_define)^0,
cactor = cmd(D),
count = cmd(D),
cstator = cmd(D),
cstat = cmd(D),
clipdist = cmd(D),
sizeto = cmd(D,D),
sizeat = cmd(D,D),
strength = cmd(D),
addstrength = cmd(D),
spritepal = cmd(D),
hitradius = cmd(D,D,D,D,D),
hitradiusvar = cmd(R,R,R,R,R),
-- some commands taking read vars
eshootvar = cmd(R),
espawnvar = cmd(R),
qspawnvar = cmd(R),
eqspawnvar = cmd(R),
operaterespawns = cmd(R),
operatemasterswitches = cmd(R),
checkactivatormotion = cmd(R),
time = cmd(R), -- no-op
inittimer = cmd(R),
lockplayer = cmd(R),
shootvar = cmd(R),
quake = cmd(R),
jump = cmd(R),
cmenu = cmd(R),
soundvar = cmd(R),
globalsoundvar = cmd(R),
stopsoundvar = cmd(R),
soundoncevar = cmd(R),
angoffvar = cmd(R),
checkavailweapon = cmd(R),
checkavailinven = cmd(R),
guniqhudid = cmd(R),
savegamevar = cmd(R),
readgamevar = cmd(R),
userquote = cmd(R),
echo = cmd(R),
starttrackvar = cmd(R),
clearmapstate = cmd(R),
activatecheat = cmd(R),
setgamepalette = cmd(R),
-- some commands taking defines
addammo = cmd(D,D),
addweapon = cmd(D,D), -- exec SPECIAL HANDLING!
debris = cmd(D,D),
addinventory = cmd(D,D),
guts = cmd(D,D),
-- cont'd
addkills = cmd(D),
addphealth = cmd(D),
angoff = cmd(D),
debug = cmd(D),
endofgame = cmd(D),
eqspawn = cmd(D),
espawn = cmd(D),
globalsound = cmd(D),
lotsofglass = cmd(D),
mail = cmd(D),
money = cmd(D),
paper = cmd(D),
qspawn = cmd(D),
quote = cmd(D),
savenn = cmd(D),
save = cmd(D),
sleeptime = cmd(D),
soundonce = cmd(D),
sound = cmd(D),
spawn = cmd(D),
stopsound = cmd(D),
eshoot = cmd(D),
ezshoot = cmd(R,D),
ezshootvar = cmd(R,R),
shoot = cmd(D),
zshoot = cmd(R,D),
zshootvar = cmd(R,R),
fall = cmd(),
flash = cmd(),
getlastpal = cmd(),
insertspriteq = cmd(),
killit = cmd(),
mikesnd = cmd(),
nullop = cmd(),
pkick = cmd(),
pstomp = cmd(),
resetactioncount = cmd(),
resetcount = cmd(),
resetplayer = cmd(),
respawnhitag = cmd(),
tip = cmd(),
tossweapon = cmd(),
wackplayer = cmd(),
-- player/sprite searching
findplayer = cmd(W),
findotherplayer = cmd(W),
findnearspritezvar = cmd(D,R,R,W),
findnearspritez = cmd(D,D,D,W),
findnearsprite3dvar = cmd(D,R,W),
findnearsprite3d = cmd(D,D,W),
findnearspritevar = cmd(D,R,W),
findnearsprite = cmd(D,D,W),
findnearactorzvar = cmd(D,R,R,W),
findnearactorz = cmd(D,D,D,W),
findnearactor3dvar = cmd(D,R,W),
findnearactor3d = cmd(D,D,W),
findnearactorvar = cmd(D,R,W),
findnearactor = cmd(D,D,W),
-- quotes
qsprintf = sp1 * t_rvar * sp1 * t_rvar * (sp1 * t_rvar)^-32,
qgetsysstr = cmd(R,R),
qstrcat = cmd(R,R),
qstrcpy = cmd(R,R),
qstrlen = cmd(R,R),
qstrncat = cmd(R,R),
qsubstr = cmd(R,R),
-- array stuff
copy = sp1 * t_identifier * arraypat * sp1 * t_identifier * arraypat * sp1 * t_rvar,
setarray = sp1 * t_identifier * arraypat * sp1 * t_rvar,
activatebysector = cmd(R,R),
addlogvar = cmd(R), -- HERE, it's significant that addlogvar
-- addlog = cmd(), -- comes before addlog!
addweaponvar = cmd(R,R), -- exec SPECIAL HANDLING!
cansee = cmd(R,R,R,R,R,R,R,R,W),
canseespr = cmd(R,R,W),
changespritesect = cmd(R,R),
changespritestat = cmd(R,R),
clipmove = cmd(W,W,W,R,W,R,R,R,R,R,R),
clipmovenoslide = cmd(W,W,W,R,W,R,R,R,R,R,R),
displayrand = cmd(W),
displayrandvar = cmd(W,D),
displayrandvarvar = cmd(W,R),
dist = cmd(W,R,R),
dragpoint = cmd(R,R,R),
hitscan = cmd(R,R,R,R,R,R,R,W,W,W,W,W,W,R), -- 7R 6W 1R
-- screen text and numbers display
gametext = cmd(R,R,R,R,R,R,R,R,R,R,R), -- 11 R
gametextz = cmd(R,R,R,R,R,R,R,R,R,R,R,R), -- 12 R
digitalnumber = cmd(R,R,R,R,R,R,R,R,R,R,R), -- 11R
digitalnumberz = cmd(R,R,R,R,R,R,R,R,R,R,R,R), -- 12R
minitext = cmd(R,R,R,R,R),
ldist = cmd(W,R,R),
lineintersect = cmd(R,R,R,R,R,R,R,R,R,R,W,W,W,W), -- 10R 4W
rayintersect = cmd(R,R,R,R,R,R,R,R,R,R,W,W,W,W), -- 10R 4W
loadmapstate = cmd(),
savemapstate = cmd(),
movesprite = cmd(R,R,R,R,R,W),
neartag = cmd(R,R,R,R,R,W,W,W,W,R,R),
operateactivators = cmd(R,R),
operatesectors = cmd(R,R),
palfrom = (sp1 * t_define)^-4,
-- must come after all other operate* commands
-- operate = cmd(),
myos = cmd(R,R,R,R,R),
myosx = cmd(R,R,R,R,R),
myospal = cmd(R,R,R,R,R,R),
myospalx = cmd(R,R,R,R,R,R),
headspritesect = cmd(R,R),
headspritestat = cmd(R,R),
nextspritesect = cmd(R,R),
nextspritestat = cmd(R,R),
prevspritesect = cmd(R,R),
prevspritestat = cmd(R,R),
readarrayfromfile = cmd(I,D),
writearraytofile = cmd(I,D),
redefinequote = sp1 * t_define * newline_term_string,
resizearray = cmd(I,R),
getarraysize = cmd(I,W),
rotatepoint = cmd(R,R,R,R,R,W,W),
rotatesprite = cmd(R,R,R,R,R,R,R,R,R,R,R,R), -- 12R
rotatesprite16 = cmd(R,R,R,R,R,R,R,R,R,R,R,R), -- 12R
sectorofwall = cmd(W,R,R),
sectclearinterpolation = cmd(R),
sectsetinterpolation = cmd(R),
sectgethitag = cmd(),
sectgetlotag = cmd(),
spgethitag = cmd(),
spgetlotag = cmd(),
showview = cmd(R,R,R,R,R,R,R,R,R,R), -- 10R
showviewunbiased = cmd(R,R,R,R,R,R,R,R,R,R), -- 10R
smaxammo = cmd(R,R),
gmaxammo = cmd(R,W),
spriteflags = cmd(R), -- also see outer
ssp = cmd(R,R),
startlevel = cmd(R,R),
starttrack = cmd(D),
stopactorsound = cmd(R,R),
stopallsounds = cmd(),
updatesector = cmd(R,R,W),
updatesectorz = cmd(R,R,R,W),
getactorangle = cmd(W),
setactorangle = cmd(R),
getplayerangle = cmd(W),
setplayerangle = cmd(R),
getangletotarget = cmd(W),
getceilzofslope = cmd(R,R,R,W),
getflorzofslope = cmd(R,R,R,W),
getcurraddress = cmd(W), -- XXX
getkeyname = cmd(R,R,R),
getpname = cmd(R,R),
gettextureceiling = cmd(),
gettexturefloor = cmd(),
getticks = cmd(W),
gettimedate = cmd(W,W,W,W,W,W,W,W),
getzrange = cmd(R,R,R,R,W,W,W,W,R,R),
setactorsoundpitch = cmd(R,R,R),
setaspect = cmd(R,R),
}
local Cif = {
-- XXX: ai, action, move/def labels
ifai = cmd(D),
ifaction = cmd(D),
ifmove = cmd(D),
ifrnd = cmd(D),
ifpdistl = cmd(D),
ifpdistg = cmd(D),
ifwasweapon = cmd(D),
ifactioncount = cmd(D),
ifcount = cmd(D),
ifactor = cmd(D),
ifstrength = cmd(D),
ifspawnedby = cmd(D),
ifgapzl = cmd(D),
iffloordistl = cmd(D),
ifceilingdistl = cmd(D),
ifphealthl = cmd(D),
ifspritepal = cmd(D),
ifgotweaponce = cmd(D),
ifangdiffl = cmd(D),
ifsound = cmd(D),
ifpinventory = cmd(D,D),
ifvarl = cmd(R,D),
ifvarg = cmd(R,D),
ifvare = cmd(R,D),
ifvarn = cmd(R,D),
ifvarand = cmd(R,D),
ifvaror = cmd(R,D),
ifvarxor = cmd(R,D),
ifvareither = cmd(R,D),
ifvarvarg = cmd(R,R),
ifvarvarl = cmd(R,R),
ifvarvare = cmd(R,R),
ifvarvarn = cmd(R,R),
ifvarvarand = cmd(R,R),
ifvarvaror = cmd(R,R),
ifvarvarxor = cmd(R,R),
ifvarvareither = cmd(R,R),
ifactorsound = cmd(R,R),
ifp = (sp1 * t_define)^1,
ifsquished = cmd(),
ifserver = cmd(),
ifrespawn = cmd(),
ifoutside = cmd(),
ifonwater = cmd(),
ifnotmoving = cmd(),
ifnosounds = cmd(),
ifmultiplayer = cmd(),
ifinwater = cmd(),
ifinspace = cmd(),
ifinouterspace = cmd(),
ifhitweapon = cmd(),
ifhitspace = cmd(),
ifdead = cmd(),
ifclient = cmd(),
ifcanshoottarget = cmd(),
ifcanseetarget = cmd(),
-- ifcansee = cmd(),
ifbulletnear = cmd(),
ifawayfromwall = cmd(),
ifactornotstayput = cmd(),
}
----==== Tracing and reporting ====----
local string = require("string")
-- newlineidxs will contain the 1-based file offsets to "\n" characters
local newlineidxs = {}
local function printf(fmt, ...)
print(string.format(fmt, ...))
end
-- Returns index into the sorted table tab such that
-- tab[index] <= searchelt < tab[index+1].
-- Preconditions:
-- tab[i] < tab[i+1] for 1 <= i < #tab
-- tab[1] <= searchelt < tab[#tab]
-- If tab has less than 2 elements, returns nil.
local function bsearch(tab, searchelt)
-- printf("bsearch(tab, %d)", searchelt)
local l, r = 1, #tab
local i
if (r <= 1) then
return
end
while (l ~= r) do
i = l + math.ceil((r-l)/2) -- l < i <= r
assert(l < i and i <= r)
local elt = tab[i]
-- printf("l=%d tab[%d]=%d r=%d", l, i, elt, r)
if (searchelt == elt) then
return i
end
if (searchelt < elt) then
r = i-1
else -- (searchelt > elt)
l = i
end
end
-- printf("return tab[%d]=%d", l, tab[l])
return l
end
local function getlinecol(pos)
local line = bsearch(newlineidxs, pos)
local col = pos-newlineidxs[line-1]
return line, col
end
-- Last keyword position, for error diagnosis.
local g_lastkwpos = nil
local g_lastkw = nil
local g_badids = {} -- maps bad id strings to 'true'
-- A generic trace function, prints a position together with the match content
-- A non-existing 'doit' means 'true'.
local function TraceFunc(pat, label, doit)
pat = Pat(pat)
if (doit==nil or doit) then
local function tfunc(subj, pos, a)
local line, col = getlinecol(pos)
printf("%d,%d:%s: %s", line, col, label, a)
return true
end
pat = lpeg.Cmt(pat, tfunc)
elseif (label=="kw") then -- HACK
local function tfunc(subj, pos, a)
g_lastkwpos = pos
g_lastkw = a
return true
end
-- XXX: is there a better way?
pat = lpeg.Cmt(pat, tfunc)
end
return pat
end
local function BadIdentFunc(pat)
local function tfunc(subj, pos, a)
if (not g_badids[a]) then
local line, col = getlinecol(pos)
printf("%d,%d: warning: bad identifier: %s", line, col, a)
g_badids[a] = true
end
return true
end
return lpeg.Cmt(Pat(pat), tfunc)
end
-- These are tracers for specific patterns which can be disabled
-- if desired.
local function Keyw(kwname) return TraceFunc(kwname, "kw", false) end
local function NotKeyw(text) return TraceFunc(text, "!kw", false) end
local function Ident(idname) return TraceFunc(idname, "id", false) end
local function BadIdent(idname) return BadIdentFunc(idname) end
local function Stmt(cmdpat) return TraceFunc(cmdpat, "st", false) end
----==== Translator continued ====----
-- attach the command names at the front!
local function attachnames(kwtab)
for cmdname,cmdpat in pairs(kwtab) do
kwtab[cmdname] = Keyw(cmdname) * cmdpat
end
end
attachnames(Co)
attachnames(Ci)
attachnames(Cif)
-- Takes one or more tables and +'s all its patterns together in the order of
-- appearance.
-- The tables must map command names to their patterns.
local function all_alt_pattern(...)
local pat = Pat(false)
local args = {...}
for argi=1,#args do
local pattab = args[argi]
-- NOTE: pairs() iterates in undefined order!
-- We can't handle prefix-problematic commands this way here.
for cmdname,cmdpat in pairs(pattab) do
pat = cmdpat + pat
end
end
return pat
end
-- actor ORGANTIC is greeting!
local function warn_on_lonely_else(subj, pos)
local line, col = getlinecol(pos)
printf("%d,%d: warning: found `else' with no `if'", line, col)
return true
end
-- NOTE: The indented text is not true, e.g. addlog vs. addlogvar:
-- since 'addlog' has no args, it will get matched given an 'addlogvar' in the subject:
-- About prefixes: I think it's not a problem *here* if e.g. "getactor" comes
-- before "getactorvar", because the pattern for the former will fail
-- eventually in the ordered choice if fed with the latter. However, it DOES
-- matter in the keyword list, see NotKeyw() trace function and comment in
-- con_lang.lua.
-- Do we have more of them? Yes.
-- operate/operate*
-- ifcansee/ifcanseetarget
local con_outer_command = all_alt_pattern(Co)
-- Empty-arged commands that are prefixes of others must come last:
local con_inner_command = all_alt_pattern(Ci) + "addlog" + "operate"
local con_if_begs = all_alt_pattern(Cif) + "ifcansee"
local lone_else = lpeg.Cmt("else" * sp1, warn_on_lonely_else)
local stmt_list = Var("stmt_list")
-- possibly empty statement list:
local stmt_list_or_eps = (stmt_list * sp1)^-1
local stmt_list_nosp_or_eps = (stmt_list * (sp1 * stmt_list)^0)^-1
-- common to all three: <name/tilenum> [<strength> [<action> [<move> [<ai>... ]]]]
local common_actor_end = sp1 * t_define * sp1 * (t_define * sp1)^0 * stmt_list_or_eps * "enda"
--== block delimiters (no recursion) ==--
local Cb = {
-- actor (...)
actor = common_actor_end,
-- eventloadactor (...)
eventloadactor = common_actor_end,
-- useractor <actortype> (...)
useractor = sp1 * t_define * common_actor_end,
onevent = sp1 * t_define * sp1 * stmt_list_or_eps * "endevent",
state = sp1 * t_identifier * sp1 * stmt_list_or_eps * "ends",
}
attachnames(Cb)
local t_good_identifier = Range("AZ", "az", "__") * Range("AZ", "az", "__", "09")^0
-- CON isaltok also has chars in "{}.", but these could potentially
-- interfere with *CON* syntax. The "]" is so that the number in array[80]
-- isn't considered a broken identifier.
-- "-" is somewhat problematic, but we allow it only as 2nd and up character, so
-- there's no ambiguity with unary minus. (Commands must be separated by spaces
-- in CON, so a trailing "-" is "OK", too.)
-- This is broken in itself, so we ought to make a compatibility/modern CON switch.
local t_broken_identifier = BadIdent(-((t_number + t_good_identifier) * (sp1 + Set("[]:"))) *
(alphanum + Set("_/\\*")) * (alphanum + Set("_/\\*-"))^0)
--- The final grammar!
local Grammar = Pat{
-- The starting symbol.
-- A translation unit is a (possibly empty) sequence of outer CON
-- commands, separated by at least one whitespace which may be
-- omitted at the EOF.
sp0 * ((con_outer_command + all_alt_pattern(Cb)) * sp1)^0,
-- Deps. These appear here because we're hitting a limit with LPeg else:
-- http://lua-users.org/lists/lua-l/2008-11/msg00462.html
-- NOTE: NW demo (NWSNOW.CON) contains a Ctrl-Z char (dec 26)
whitespace = Set(" \t\r\26") + newline + Set("(),;") + comment + linecomment,
t_identifier_all = t_broken_identifier + t_good_identifier,
-- NOTE: -con_keyword alone would be wrong, e.g. "state breakobject":
-- NOTE 2: The + "[" is so that stuff like
-- getactor[THISACTOR].x x
-- getactor[THISACTOR].y y
-- is parsed correctly. (Compared with this:)
-- getactor[THISACTOR].x x
-- getactor [THISACTOR].y y
-- This is in need of cleanup!
t_identifier = -NotKeyw(con_keyword * (sp1 + "[")) * Ident(t_identifier_all),
t_define = (Pat("-") * sp0)^-1 * (t_identifier + t_number),
t_arrayexp = t_identifier * arraypat * memberpat^-1,
-- SWITCH
switch_stmt = Keyw("switch") * sp1 * t_rvar *
(Var("case_block") + Var("default_block"))^0 * sp1 * "endswitch",
-- NOTE: some old DNWMD has "case: PIGCOP". I don't think I'll allow that.
case_block = (sp1 * Keyw("case") * sp1 * t_define * (sp0*":")^-1)^1 * sp1 *
stmt_list_nosp_or_eps, -- * "break",
default_block = sp1 * Keyw("default") * (sp0*":"*sp0 + sp1) * stmt_list_nosp_or_eps, -- * "break",
-- The "lone" if statement is tested first, so that a potential dangling "else" is
-- attached to the outermost possible "if", as done by CON
if_stmt = con_if_begs * sp1 * Var("single_stmt") * -(sp1 * Pat("else"))
+ con_if_begs * sp1 * Var("single_stmt") * sp1 * "else" * sp1 * Var("single_stmt"),
while_stmt = Keyw("whilevarvarn") * sp1 * t_rvar * sp1 * t_rvar * sp1 * Var("single_stmt")
+ Keyw("whilevarn") * sp1 * t_rvar * sp1 * t_define * sp1 * Var("single_stmt"),
-- TODO: some sp1 --> sp0?
single_stmt = Stmt(
lone_else^-1 *
( Keyw("{") * sp1 * "}" -- space separation of commands in CON is for a reason!
+ Keyw("{") * sp1 * stmt_list * sp1 * "}"
+ (con_inner_command + Var("switch_stmt") + Var("if_stmt") + Var("while_stmt"))
-- + lpeg.Cmt(t_newline_term_str, function (subj, curpos) print("Error at "..curpos) end)
)),
-- a non-empty statement/command list
stmt_list = Var("single_stmt") * (sp1 * Var("single_stmt"))^0,
}
local math = require("math")
local function setup_newlineidxs(contents)
newlineidxs = {}
for i in string.gmatch(contents, "()\n") do
newlineidxs[#newlineidxs+1] = i
end
-- dummy newlines at beginning and end
newlineidxs[#newlineidxs+1] = #contents+1
newlineidxs[0] = 0
end
---=== stand-alone: ===---
if (not EDUKE32_LUNATIC) then
local io = require("io")
for argi=1,#arg do
local filename = arg[argi]
printf("\n---- Parsing file \"%s\"", filename);
local contents = io.open(filename):read("*all")
setup_newlineidxs(contents)
g_badids = {}
local idx = lpeg.match(Grammar, contents)
if (not idx) then
print("Match failed.")
elseif (idx == #contents+1) then
print("Matched whole contents.")
else
local i, col = getlinecol(idx)
local bi, ei = newlineidxs[i]+1, newlineidxs[i+1]-1
printf("Match succeeded up to %d (line %d, col %d; len=%d)",
idx, i, col, #contents)
-- printf("Line goes from %d to %d", bi, ei)
print(string.sub(contents, bi, ei))
if (g_lastkwpos) then
i, col = getlinecol(g_lastkwpos)
printf("Last keyword was at line %d, col %d: %s", i, col, g_lastkw)
end
end
end
end
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