Provided by: ivtools-bin_1.2.11a1-2_amd64 
NAME
comterp - distributed command interpreter demonstrator
SYNOPSIS
comterp
comterp remote
comterp server 'portnum'
comterp logger 'portnum'
comterp client 'host' 'portnum' ['file']
comterp telcat 'host' 'portnum' ['file']
comterp run 'file'
DESCRIPTION
comterp demonstrates the command interpreter incorporated into ivtools. A user (or client program) can
interact with comterp via stdin and stdout or telnet (when ACE is built in). The command syntax is a
semi-colon separated list of commands with arbitrary number of parameters enclosed in parenthesis, with
support for optional parameters and keyword arguments, i.e:
command2(arg1 arg2 arg3 :key1 val1 :key2 val2);
command1(arg1 arg2 arg3 :key1 val1 :key2 val2)
C-like binary expressions can be embedded anywhere in the command language, using the operators in the
table below. Variables can be created on the fly with an assignment operator (i.e "ball=1" creates a
integer "ball" variable set to 1). Unterminated expressions cause an automatic command line extension
(until the parser determines the expression is complete). "(), "{}", and "[]" can all be used
interchangeably.
COMMAND OPTIONS
comterp
Invoke a single command interpreter to interact with via stdin and stdout.
comterp remote
Invoke a single command interpreter, like the default, and include a remote command for accessing other
comterp's in server mode.
comterp server 'portnum'
Listens for and accept connections on portnum, then setup a command interpreter to wait for and process
commands from that connection.
comterp logger 'portnum'
Listens for and accept connections on portnum, then simply forward the incoming messages to stdout, while
ack'ing back with newlines. For debugging purposes, not really a use of the interpreter.
comterp client 'host' 'portnum' ['file']
Connect to a portnum on a host and send/receive new-line terminated text buffers. For debugging
purposes, not really a use of the interpreter.
comterp telcat 'host' 'portnum' ['file']
Connect to a portnum on a host, cat the file, then close the connection. Not really a use of the
interpreter either.
comterp run 'file'
Run contents of file then exit.
OPERATOR TABLE
Operators Command Name Priority Order Type
--------- ------------ -------- ----- ----
. dot 130 R-to-L binary
` bquote 125 R-to-L unary-prefix
$ stream 125 R-to-L unary-prefix
! negate 110 R-to-L unary-prefix
~ bit_not 110 R-to-L unary-prefix
++ incr 110 R-to-L unary-prefix
++ incr_after 110 R-to-L unary-postfix
- minus 110 R-to-L unary-prefix
-- decr 110 R-to-L unary-prefix
-- decr_after 110 R-to-L unary-postfix
** repeat 90 L-to-R binary
.. iterate 80 L-to-R binary
% mod 70 L-to-R binary
* mpy 70 L-to-R binary
/ div 70 L-to-R binary
+ add 60 L-to-R binary
- sub 60 L-to-R binary
<< lshift 55 L-to-R binary
>> rshift 55 L-to-R binary
< lt 50 L-to-R binary
<= lt_or_eq 50 L-to-R binary
> gt 50 L-to-R binary
>= gt_or_eq 50 L-to-R binary
!= not_eq 45 L-to-R binary
== eq 45 L-to-R binary
& bit_and 44 L-to-R binary
^ bit_xor 43 L-to-R binary
| bit_or 42 L-to-R binary
&& and 41 L-to-R binary
|| or 40 L-to-R binary
, tuple 35 L-to-R binary
,, concat 33 L-to-R binary
%= mod_assign 30 R-to-L binary
*= mpy_assign 30 R-to-L binary
+= add_assign 30 R-to-L binary
-= sub_assign 30 R-to-L binary
/= div_assign 30 R-to-L binary
= assign 30 R-to-L binary
; seq 10 L-to-R binary
MATHEMATICAL COMMANDS:
n=min(a b) -- return minimum of a and b
n=max(a b) -- return maximum of a and b
n=abs(a) -- return absolute value of a
dbl=exp(x) -- returns the value e raised to the power of x
dbl=log(x) -- returns the natural logarithm of x
dbl=log10(x) -- returns the base-10 logarithm of x
dbl=pow(x y) -- returns the value of x raised to the power of y
dbl=acos(x) -- returns the arc cosine of x in radians
dbl=asin(x) -- returns the arc sine of x in radians
dbl=atan(x) -- returns the arc tangent of x in radians
dbl=atan2(y x) -- returns the arc tangent of y over x
dbl=cos(x) -- returns the cosine of x radians
dbl=sin(x) -- returns the sine of x radians
dbl=tan(x) -- returns the tangent of x radians
dbl=sqrt(x) -- returns square root of x
dbl=pi() -- returns the value of pi
dbl=radtodeg(dbl) -- convert radians to degrees
dbl=degtorad(dbl) -- convert degrees to radians
num=floor(num) -- return closest integer value less than or equal to argument
num=ceil(num) -- return closest integer value greater than or equal to argument
num=round(num) -- return closest integer value
AFFINE TRANSFORM AND MATRIX COMMANDS:
point=xform(x,y a00,a01,a10,a11,a20,a21) -- affine transform of x,y coordinates
affine=invert(a00,a01,a10,a11,a20,a21) -- invert affine transform
matrix=xpose(matrix) -- transpose an arbitrary matrix
matrix=matrix*matrix -- matrix multiplication
STATISTICAL/RANDOM COMMANDS:
sum(val1[,val2[,...,valn]]) -- return sum of values
mean(val1[,val2[,...,valn]]) -- return mean of values
var(val1[,val2[,...,valn]]) -- return variance of values
stddev(val1[,val2[,...,valn]]) -- return standard deviation of values
rand([minval,maxval]) -- return random number between 0 and 1 or minval,maxval
srand(seedval) -- seed random number generator
LIST COMMANDS:
lst=list([olst|strm|val] :strmlst :attr :size n) -- create list, copy list, or convert stream
val=at(list|attrlist|str n :set val :ins val) -- return (or set or insert after) nth item in a list or
string
num=size(list|attrlist|str) -- return size of a list (or string)
val=index(list|str val|char|str :last :all) -- return index of value (or char or string) in list (or
string), nil if not found.
STREAM COMMANDS:
val=next(stream) -- return next value from stream
strm=stream(ostrm|list|attrlist) -- copy stream or convert list
cnt=each(strm) -- traverse stream returning its length
CONTROL COMMANDS (using post evaluation):
val=cond(testexpr trueexpr falseexpr) -- evaluate testexpr, and if true, evaluate and return trueexpr,
otherwise evaluate and return falseexpr
val=if(testexpr :then expr :else expr) -- evaluate testexpr and execute the :then expression if true,
the :else expression if false.
val=for(initexpr whileexpr [nextexpr [bodyexpr]] :body expr) -- for loop
val=while([testexpr [bodyexpr]] :nilchk :until :body expr ) -- while loop
val=switch(val key-body-pairs) -- switch statement (:casen for pos., :case_n for neg., otherwise
:symbol)
OTHER COMMANDS
help(cmdname [cmdname ...] :all :posteval) -- help for commands
val=trace([flag] :get) -- toggle or set trace mode
pause() -- pause script execution until C/R
step() -- toggle stepwise script execution
fileobj|pipeobj=open([filename [modestr]] :pipe :in :out :err) -- open file command
close(fileobj|pipeobj) -- close file command
[str]=print([fmtstr] [val [val1 [... valn]]] :string|:str :out :err :file fileobj|pipeobj :prefix str)
-- print value with optional format string
str=gets(fileobj|pipeobj) -- gets a new-line terminated string from a file
val=global(symbol)|global(symbol)=val|global(symbol :clear)|global(:cnt) -- make symbol global
int|lst=symid(symbol [symbol ...] | :max) -- return integer id(s) associated with symbol(s)
sym|lst=symbol(symid [symid ...]) -- return symbol(s) associated with integer id(s)
val|lst=symval(symbol [symbol ...]) -- return value(s) associated with symbol variables(s)
sym|lst=symadd(sym|str [sym|str ...]) -- create symbol(s) and return without lookup.
sym=symvar(sym) -- return symbol as-is
str=symstr(sym) -- return string version of symbol
n=strref(str|symid) -- return string reference count
lst=split(symbol|string :tokstr [delim] :tokval [delim]) -- split symbol or string into list of
characters (or tokens).
str=join(clist :sym) -- join list of characters into string
str=substr(str n|str :after) -- extract characters from a string
bool=eq(str1 str2 :n len) -- partial string comparison
bool=eq(sym1 sym2 :sym) -- symbol comparison
postfix(arg1 [arg2 [arg3 ... [argn]]]) -- echo unevaluated postfix arguments (with [narg|nkey] after
defined commands, {narg|nkey} after undefined commands, (narg) after keys, and a * following post-
evaluation commands)
arr=posteval(arg1 [arg2 [arg3 ... [argn]]]) -- post-evaluate every fixed argument (until nil) and return
array
sym=attrname(attribute) -- return name field of dotted pair
val=attrval(attribute) -- return value field of dotted pair
dotlst=dot(name) -- construct empty dotted pair list
quit() -- quit the interpreter
exit() -- exit entire application
empty() -- empty statement
val=run(filename :str :popen) -- run commands from file (or string)
val=remote(hoststr portnum cmdstr :nowait) -- remotely evaluate command string then locally evaluate
result string
val=eval(cmdstr|funcobj [cmdstr|funcobj ...] :symret ) -- evaluate string (or funcobj) as commands,
optionally return symbol instead of nil
funcobj=func(body :echo) -- encapsulate a body of commands into an executable object
val=shell(cmdstr) -- evaluate command in shell
usleep(msec) -- sleep microseconds
mute([flag]) -- set or toggle mute flag
nil([...]) -- accept any arguments and return nil
c=char(num :u) -- convert any numeric to a char
s=short(num :u) -- convert any numeric to a short
i=int(num :u) -- convert any numeric to an int
l=long(num :u) -- convert any numeric to a long
f=float(num) -- convert any numeric to a float
d=double(num) -- convert any numeric to a double
sym|lst=type(val [val ...]) -- return type symbol(s) for value(s)
sym|lst=class(val [val ...]) -- return class symbol(s) for value(s) of object type
int=ctoi(char) -- convert character to integer
flag=isspace(char) -- return true if character is whitespace
flag=isdigit(char) -- return true if character is a numeric digit
flag=isspace(char) -- return true if character is alphabetical
str=arg(n) -- return command line argument
n=narg(n) -- return number of command line arguments
num=nand(a b) -- bitwise NAND(negated AND)
num=nor(a b) -- bitwise NOR (negated OR)
num=xnor(a b) -- bitwise XNOR (negated XOR)
ONLY IN SERVER MODE
str=timeexpr(comstr :sec n) -- command string to execute at intervals
SEE ALSO
comdraw
WEB PAGES
http://www.ivtools.org/ivtools/comterp.html
COMTERP(1)