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// Scicos
//
// Copyright (C) INRIA - METALAU Project <scicos@inria.fr>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// See the file ../license.txt
//
function [x,y,typ]=EXPRESSION(job,arg1,arg2)
x=[];
y=[];
typ=[];
select job
case "set" then
x=arg1
model=arg1.model;
graphics=arg1.graphics;
exprs=graphics.exprs
%scicos_context=%scicos_context;
for ii=1:8,
execstr("%scicos_context.u"+string(ii)+"=0"),
end
ieee(2)
while %t do
[ok,%nin,%exx,%usenz,exprs]=scicos_getvalue(..
["Give a scalar scilab expression using inputs u1, u2,...";
"If only one input, input is vector [u1,u2,...] (max 8)";
"ex: (dd*u1+sin(u2)>0)*u3";
"Note that here dd must be defined in context"],..
["number of inputs";"scilab expression";"use zero-crossing (0: no, 1 yes)"],..
list("vec",1,"vec",1,"vec",1),exprs)
ieee(0)
clear %scicos_context
if ~ok then
break,
end
%exx=strsubst(exprs(2)," ","")
if %exx==emptystr() then
%exx="0",
end //avoid empty
//expression
if %nin==1 then
%nini=8,
else
%nini=%nin
end
%head="%foo("
for %jji=1:%nini-1,
%head=%head+"u"+string(%jji)+",",
end
%head=%head+"u"+string(%nini)+")"
ok=execstr("deff(%head,%exx)","errcatch")==0
if ~ok then
message(["Erroneous expression";lasterror()])
else
if %nin>1 then
[model,graphics,ok]=check_io(model,graphics,ones(1,%nin),1,[],...
[])
else
[model,graphics,ok]=check_io(model,graphics,-1,1,[],...
[])
end
if ok then
[ok,%ok1,ipar,rpar,%nz]=compiler_expression(%foo)
if ~ok then
message(["Erroneous expression";lasterror()])
else
if %ok1 then
model.rpar=rpar
model.ipar=ipar
if %usenz then
model.nzcross=%nz
model.nmode=%nz
else
model.nzcross=0
model.nmode=0
end
graphics.exprs=exprs
x.graphics=graphics
x.model=model
break
end
end
end
end
end
case "define" then
in=[1;1]
out=1
txt="(u1>0)*sin(u2)^2"
deff("%foo(u1,u2)",txt)
[%ok1,ipar,rpar,nz]=compile_expr(%foo)
model=scicos_model()
model.sim=list("evaluate_expr",4)
model.in=in
model.out=out
model.rpar=rpar
model.ipar=ipar
model.nzcross=nz
model.nmode=nz
model.dep_ut=[%t %f]
exprs=[string(size(in,"*"));txt;"1"]
gr_i=[]
x=standard_define([5 2],model,exprs,gr_i)
end
endfunction
function [ok,%ok1,ipar,rpar,%nz]=compiler_expression(%foo)
ok=%t,%ok1=%f,ipar=[],rpar=[],%nz=[]
if exists("%scicos_context") then
%mm=getfield(1,%scicos_context)
for %mi=%mm(3:$)
if execstr(%mi+"=%scicos_context(%mi)","errcatch")<>0 then
ok=%f
end
end
end
if ok then
ok=execstr("[%ok1,ipar,rpar,%nz]=compile_expr(%foo)","errcatch")==0
end
endfunction
function [ok,%ipar,%rpar,%nz]=compile_expr(%foo)
ok=%t
%lst=macr2lst(%foo);
%mm=macrovar(%foo);
%MM=%mm(3);
%FF=["sin";"cos";"tan";"exp";"log";
"sinh";"cosh";"tanh";
"int";"round";"ceil";"floor";
"sign";"abs";"max";"min";
"asin";"acos";"atan";"asinh";"acosh";"atanh";
"atan2";
"log10";
]; // ops above 100
%num_arg=[1;1;1;1;1;
1;1;1
1;1;1;1;
1;1;2;2;
1;1;1;1;1;1;
2;
1
]; //number of arguments
%ZCR=[16,17,18,19,20,21,28,29,30,109,110,111,112,113,114,115,116]; // ops with zero-crossing
%UU=%mm(1)
%ipar=[]
%rpar=[]
%nrpar=0
%nz=0
%ijk=4
while %ijk<length(%lst)
%ijk=%ijk+1
select evstr(%lst(%ijk)(1))
case 2
%jjk=find(%lst(%ijk)(2)==%FF)
if %jjk<> [] then
if evstr(%lst(%ijk)(4))<>%num_arg(%jjk) then
message(%lst(%ijk)(2)+" must have "+string(%num_arg(%jjk))+" arguments")
ok=%f
return
else
%ipar=[%ipar;5;100+%jjk]
if or(100+%jjk==%ZCR) then
%nz=%nz+1,
end
%ijk=%ijk+1
end
else
%jjk=find(%lst(%ijk)(2)==%MM)
if %jjk<> [] then
if ~exists(%MM(%jjk)) then
message("Variable "+%MM(%jjk)+" is not defined.")
ok=%f
return
end
%var=evstr(%MM(%jjk))
if size(%var,"*")<>1 then
message("Variable "+%MM(%jjk)+" is not scalar.")
ok=%f
return
else
%nrpar=%nrpar+1
%rpar(%nrpar)=%var
%ipar=[%ipar;6;%nrpar]
end
else
%jjk=find(%lst(%ijk)(2)==%UU)
if %jjk<> [] then
%ipar=[%ipar;2;%jjk]
else
message("Unknown variable "+%lst(%ijk)(2))
ok=%f
end
//%ipar=[%ipar;2;evstr(strsubst(%lst(%ijk)(2),'u',''))]
end
end
case 5
// case of - with one operand (-u1)
if (evstr(%lst(%ijk)(2))==2)&(evstr(%lst(%ijk)(3))==1) then
%ipar=[%ipar;5;99]
else
%ipar=[%ipar;5;evstr(%lst(%ijk)(2))]
if or(evstr(%lst(%ijk)(2))==%ZCR) then
%nz=%nz+1,
end
end
case 6
// %ipar=[%ipar;6;evstr(%lst(%ijk)(2))]
%nrpar=%nrpar+1
%rpar(%nrpar)=evstr(%lst(%ijk)(2))
%ipar=[%ipar;6;%nrpar]
end
end
endfunction
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