forked from mtcontrib/pdisc
149 lines
2.9 KiB
Markdown
149 lines
2.9 KiB
Markdown
commands are read line by line
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```[<labelname>:] [<commandname> [<arg1>[,<arg2[…]]]] [; <comment>]```
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arguments can be either variables, labels or immediates,
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labels are replaced with immediates which have the line numbers of the labels as their values
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true/false: boolean (immediate)
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12.6: number (immediate)
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$hello nwae: string (immediate)
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nodolla: either a label is called so (immediate) or it's a variable
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```
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Types:
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e anything
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v any variable
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ve any set variable
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s string
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vs string variable
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n number
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vn number variable
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ui unsigned integer number
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b bool
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vn bool variable
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Instructions:
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mov <v to>, <e from>
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Copies from into to.
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getvar <vs varname>[, <ve exists>]
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Sets varname to the current variable called <varname> if it's set. If exists is passed, it's set to a bool indicating whether the variable was set.
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add <vn to>, <n from>
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to += from
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add <vb to>, <b from>
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to = to and from
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add <vs to>, <s from>
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to = to .. from
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mul <vn to>, <n from>
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to *= from
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mul <vb to>, <b from>
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to = to or from
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mul <vs str>, <n cnt>
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str = str:rep(from)
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neg <vn num>
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num = -num
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neg <vb var>
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var = not var
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neg <vs str>
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str = str:rev()
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inv <vn num>
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num = 1 / num
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mod <vn num>, <n dv>
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num = num % dv
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jmp <ui p>[, <e c>]
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If c is not false, the instruction pointer is set to p. To disallow infinite loops, the program is interrupted after changing the ip, the mod should then consider restarting it.
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call <ui p>
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push the ip, then jmp p; used to execute subroutines
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ret
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pop something, then jmp there; used to exit subroutines
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push <e a>[, <e b>[, <e c>[…]]]
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put values onto the stack; from left to right
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pop <v a>[, <v b>[, <v c>[…]]]
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takes values from the stack and sets the passed variables to them; from left to right
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equal <v a>, <e b>
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a = a == b
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less <vn a>, <n b>
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a = a < b; after executing, a is a bool
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less <vs a>, <s b>
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a = a < b; less also works for strings
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usleep <n t>
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aborts the program for at least floor(max(0, t)) ms
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sleep <n t>
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executes usleep with t * 1000000 as argument
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get_us_time <v to>
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stores minetest.get_us_time() into to; can be used to measure time differences
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tostring <ve var>
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var = tostring(var)
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print <e a>[, <e b>[, <e c>[…]]]
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adds variables to the log, seperated by \t, \n is added at the end
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flush
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Output the log, this should vary for every mod.
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```
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How mods can use this mod:
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```
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local mylog = print
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local parsed_code = pdisc.parse(code_text)
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local function mystart(parsed_code)
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local thread = pdisc.create_thread(function(thread)
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thread.flush = function(self)
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mylog(self.log)
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self.log = ""
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return true
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end
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end, parsed_code)
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thread:suscitate()
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mykeepalive(thread)
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end
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mystart(parsed_code)
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local function mykeepalive(thread)
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if not thread.stopped then
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return
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end
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thread:try_rebirth()
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minetest.after(0.1, function()
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mykeepalive()
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end)
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end
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```
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TODO:
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* add string. instructions
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* add inc,dec,sub,div
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