pdisc/standardbefehlssatz.lua

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local WNOA = "wrong number of arguments"
local UAT = "unsupported argument type"
local SE = "error with cmd-cmd executing: "
local STRL = "attempt on exceeding maximum string length"
local s
s = {
mov = function(params)
return true, params[2]
end,
xchg = function(params)
return true, params[2], params[1]
end,
getvar = function(params, faden)
local p = params[1]
if type(p) ~= "string" then
return false, UAT
end
p = faden.vars[p]
return true, {p, p ~= nil}
end,
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copytable = function(params, thread)
if type(params[1]) ~= "string"
or type(params[2]) ~= "string" then
return false, "two strings expected"
end
local fromprefix = params[2] .. "."
local toprefix = params[1] .. "."
if fromprefix == toprefix then
return false, "origin and target table names must be different"
end
local tocopy = {}
local frmln = #fromprefix
for name,v in pairs(thread.vars) do
if name:sub(1, frmln) == fromprefix then
tocopy[#tocopy+1] = name:sub(frmln+1)
end
end
for i = 1,#tocopy do
local field = tocopy[i]
thread.vars[toprefix .. field] = thread.vars[fromprefix .. field]
end
return true
end,
add = function(params, faden)
local p1,p2 = unpack(params)
local t1 = type(p1)
if t1 ~= type(p2) then
return false, "different argument types"
end
if t1 == "number" then
return true, p1 + p2
end
if t1 == "boolean" then
for _,k in pairs(params) do
if k then
return true, true
end
end
return true, false
end
if t1 == "string" then
if #p1 + #p2 > faden.strlen_max then
return false, STRL
end
return true, p1 .. p2
end
return false, UAT
end,
sub = function(params)
local b = params[2]
b = b and tonumber(b)
local t2 = type(b)
if t2 ~= "number" then
return false, UAT
end
local t1 = type(params[1])
if t1 == "number" then
return true, params[1] - b
end
if t1 == "string" then
return true, params[1]:sub(b, params[3] and tonumber(params[3]))
end
end,
mul = function(params)
local p1,p2 = unpack(params)
local t1 = type(p1)
local t2 = type(p2)
if t1 == "string"
and t2 == "number" then
if #p1 * p2 > faden.strlen_max then
return false, STRL
end
return true, p1:rep(p2)
end
if t1 ~= t2 then
return false, "different argument types"
end
if t1 == "number" then
return true, p1 * p2
end
if t1 == "boolean" then
for _,k in pairs(params) do
if not k then
return true, false
end
end
return true, p1 and p2 -- nil is tested in the first two params
end
return false, UAT
end,
div = function(params)
local p1,p2 = unpack(params)
if type(p1) ~= "number"
or type(p2) ~= "number" then
return false, UAT
end
return true, p1 / p2
end,
inc = function(params)
if type(params[1]) ~= "number" then
return false, UAT
end
return true, params[1] + 1
end,
dec = function(params)
if type(params[1]) ~= "number" then
return false, UAT
end
return true, params[1] - 1
end,
neg = function(params)
local v = params[1]
local t = type(v)
if t == "number" then
return true, -v
end
if t == "boolean" then
return true, not v
end
if t == "string" then
return true, v:rev() -- does string.rev exist?
end
return false, UAT
end,
inv = function(params)
local p = params[1]
if type(p) ~= "number" then
return false, UAT
end
return true, 1 / p
end,
mod = function(params)
local p1,p2 = unpack(params)
if type(p1) ~= "number"
or type(p2) ~= "number" then
return false, UAT
end
return true, p1 % p2
end,
jmp = function(params, faden)
if #params >= 2
and not params[2] then
return true
end
local p = params[1]
if type(p) ~= "number" then
return false, UAT
end
if p < 1
or p%1 ~= 0
or p > #faden.liste + 1 then
return false, "jump target out of range"
end
faden.ip = p-1
if not s.usleep({0}, faden) then
error(SE)
end
return true
end,
call = function(params, faden)
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local subsucc,msg = s.push({faden.ip+1}, faden)
if not subsucc then
return false, SE .. msg
end
subsucc,msg = s.jmp(params, faden)
if not subsucc then
return false, SE .. msg
end
return true
end,
ret = function(_, faden)
local subsucc,msg = s.pop({true}, faden)
if not subsucc then
return false, SE .. msg
end
subsucc,msg = s.jmp(msg, faden)
if not subsucc then
return false, SE .. msg
end
return true
end,
push = function(params, faden)
local pc = #params
if pc == 0 then
return false, WNOA
end
for i = 1,pc do
faden.stack[faden.sp] = params[i]
faden.sp = faden.sp-1
end
if faden.sp < 0 then
return false, "stack overflow"
end
return true
end,
pop = function(params, faden)
local pc = #params
if pc == 0 then
return false, WNOA
end
local rt = {}
for i = 1,pc do
faden.sp = faden.sp+1
rt[i] = faden.stack[faden.sp]
end
if faden.sp > faden.sb then
return false, "stack underflow"
end
return true, rt
end,
equal = function(params)
return true, params[1] == params[2]
end,
less = function(params)
local p1,p2 = unpack(params)
local t1 = type(p1)
if t1 ~= type(p2) then
return false, "different argument types"
end
if t1 ~= "number"
and t1 ~= "string" then
return false, UAT
end
return true, p1 < p2
end,
greater = function(params)
return s.less{params[2], params[1]}
end,
usleep = function(params, faden)
local p = params[1]
if type(p) ~= "number" then
return false, UAT
end
faden.rebirth = minetest.get_us_time() + p
faden:stop()
return true
end,
sleep = function(params, faden)
local p = params[1]
if type(p) ~= "number" then
return false, UAT
end
local subsucc,msg = s.usleep({p * 1000000}, faden)
if not subsucc then
error(SE .. msg)
end
return true
end,
get_us_time = function()
return true, minetest.get_us_time()
end,
tostring = function(params)
return true, params[1] and tostring(params[1]) or nil
end,
tonumber = function(params)
return true, params[1] and tonumber(params[1])
end,
toboolean = function(params)
return true, params[1] and true or false
end,
print = function(params, faden)
for i = 1,#params do
params[i] = tostring(params[i])
end
faden.log = faden.log .. table.concat(params, "\t") .. "\n"
return true
end,
flush = function(params, faden)
return faden:flush(params)
end,
}
local so_math_fcts = {"sin", "asin", "cos", "acos", "tan", "atan", "exp", "log",
"abs", "sign", "floor", "ceil"}
for i = 1,#so_math_fcts do
i = so_math_fcts[i]
s[i] = function(params)
local p = params[1]
if type(p) ~= "number" then
return false, "this arithmetic function needs a number as argument"
end
return true, math[i](p)
end
end
local to_math_fcts = {"pow"}
for i = 1,#to_math_fcts do
i = to_math_fcts[i]
s[i] = function(params)
local p1,p2 = unpack(params)
if type(p1) ~= "number"
or type(p2) ~= "number" then
return false, "this arithmetic function needs 2 numbers as args"
end
return true, math[i](p1, p2)
end
end
local abbreviations = {
mov = ":=",
add = "+",
sub = "-",
mul = "*",
div = "/",
inc = "++",
dec = "--",
neg = "!",
less = "<",
equal = "==",
jmp = "@",
usleep = "...",
}
-- TODO set metatable
return s