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/*
* Copyright (c) 2009 Samit Basu
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "Array.hpp"
#include "Interpreter.hpp"
#include "Algorithms.hpp"
//@@Signature
//sfunction eval EvalFunction
//inputs try_clause catch_clause
//outputs varargout
//DOCBLOCK freemat_eval
static QString PrePendCallVars(QString line, int nargout) {
QString gp;
if (nargout > 1)
gp += "[";
for (int i=0;i<nargout-1;i++)
gp += QString("t___%1,").arg(i);
gp += QString("t___%1").arg(nargout-1);
if (nargout > 1)
gp += "] = " + line + ";\n";
else
gp += " = " + line + ";\n";
return gp;
}
static ArrayVector RetrieveCallVars(Interpreter *eval, int nargout) {
ArrayVector retval;
for (int i=0;i<nargout;i++) {
QString tname = QString("t___%1").arg(i);
Array tval;
ArrayReference ptr = eval->getContext()->lookupVariable(tname);
if (!ptr.valid())
tval = EmptyConstructor();
else
tval = *ptr;
eval->getContext()->deleteVariable(tname);
retval.push_back(tval);
}
return retval;
}
static ArrayVector EvalTryFunction(int nargout, Interpreter* eval, QString try_buf,
QString catch_buf, bool retrieveVars, int popSpec) {
ArrayVector retval;
bool autostop;
autostop = eval->AutoStop();
eval->setAutoStop(false);
bool save_trycatch_flag(eval->getTryCatchActive());
eval->setTryCatchActive(true);
Context *context = eval->getContext();
PopContext saver(context,popSpec);
int eval_depth = context->scopeDepth();
try {
eval->evaluateString(try_buf,true);
if (retrieveVars)
retval = RetrieveCallVars(eval,nargout);
} catch (Exception &e) {
while (context->scopeDepth() < eval_depth) context->restoreScope(1);
while (context->scopeDepth() > eval_depth) context->popScope();
eval->evaluateString(catch_buf,false);
if (retrieveVars)
retval = RetrieveCallVars(eval,nargout);
}
eval->setTryCatchActive(save_trycatch_flag);
eval->setAutoStop(autostop);
return retval;
}
static ArrayVector EvalTryFunction(int nargout, const ArrayVector& arg, Interpreter* eval, int popSpec) {
if (nargout > 0) {
QString try_line = arg[0].asString();
QString try_buf = PrePendCallVars(try_line,nargout);
QString catch_line = arg[1].asString();
QString catch_buf = PrePendCallVars(catch_line,nargout);
return EvalTryFunction(nargout,eval,try_buf,catch_buf,true,popSpec);
} else {
QString try_line = arg[0].asString();
QString catch_line = arg[1].asString();
QString try_buf = try_line + "\n";
QString catch_buf = catch_line + "\n";
return EvalTryFunction(nargout,eval,try_buf,catch_buf,false,popSpec);
}
}
ArrayVector TraceFunction(int nargout, const ArrayVector& arg, Interpreter* eval);
static ArrayVector EvalNoTryFunction(int nargout, const ArrayVector& arg, Interpreter* eval, int popSpec) {
if (nargout > 0) {
QString line = arg[0].asString();
QString buf = PrePendCallVars(line,nargout);
PopContext saver(eval->getContext(),popSpec);
eval->evaluateString(buf);
return RetrieveCallVars(eval,nargout);
} else {
QString line = arg[0].asString();
QString buf = line + "\n";
PopContext saver(eval->getContext(),popSpec);
eval->evaluateString(buf);
return ArrayVector();
}
}
ArrayVector EvalFunction(int nargout, const ArrayVector& arg,Interpreter* eval){
eval->getContext()->deactivateCurrentScope(); // Make us invisible
if (arg.size() == 0)
throw Exception("eval function takes at least one argument - the string to execute");
if (arg.size() == 2)
return EvalTryFunction(nargout, arg, eval, 0);
return EvalNoTryFunction(nargout, arg, eval, 0);
}
//@@Signature
//sfunction evalin EvalInFunction
//inputs varargin
//outputs x y z
//DOCBLOCK freemat_evalin
ArrayVector EvalInFunction(int nargout, const ArrayVector& arg, Interpreter* eval) {
if (arg.size() < 2)
throw Exception("evalin function requires a workspace (scope) specifier (either 'caller' or 'base') and an expression to evaluate");
QString spec_str = arg[0].asString();
int popspec = 0;
if (spec_str=="base")
popspec = -1;
else if (spec_str=="caller")
popspec = 2;
else
throw Exception("evalin function requires the first argument to be either 'caller' or 'base'");
ArrayVector argcopy(arg);
argcopy.pop_front();
if (arg.size() == 3)
return EvalTryFunction(nargout,argcopy,eval,popspec);
else
return EvalNoTryFunction(nargout,argcopy,eval,popspec);
}
//@@Signature
//sfunction assignin AssignInFunction
//inputs workspace variablename value
//outputs none
//DOCBLOCK freemat_assignin
ArrayVector AssignInFunction(int nargout, const ArrayVector& arg, Interpreter* eval) {
if (arg.size() < 3)
throw Exception("assignin function requires a workspace (scope) specifier (either 'caller' or 'base') a variable name and a value to assign");
QString spec_str = arg[0].asString();
int popspec = 0;
if (spec_str=="base")
popspec = -1;
else if (spec_str=="caller")
popspec = 2;
else
throw Exception("assignin function requires the first argument to be either 'caller' or 'base'");
QString varname = arg[1].asString();
Array varvalue = arg[2];
PopContext saver(eval->getContext(),popspec);
eval->getContext()->insertVariable(varname,varvalue);
return ArrayVector();
}
ArrayVector TraceFunction(int nargout, const ArrayVector& arg, Interpreter* eval) {
qDebug() << "**********************************************************************\n";
// walk the trace of
while (eval->getContext()->activeScopeName() != "base") {
qDebug() << "Scope is " << eval->getContext()->activeScopeName();
qDebug() << "Variables " << eval->getContext()->listAllVariables();
eval->getContext()->bypassScope(1);
}
qDebug() << "Scope is " << eval->getContext()->activeScopeName();
qDebug() << "Variables " << eval->getContext()->listAllVariables();
qDebug() << "**********************************************************************\n";
eval->getContext()->restoreBypassedScopes();
return ArrayVector();
}
//@@Signature
//sfunction feval FevalFunction
//inputs varargin
//outputs varargout
//DOCBLOCK freemat_feval
ArrayVector FevalFunction(int nargout, const ArrayVector& arg,Interpreter* eval){
if (arg.size() == 0)
throw Exception("feval function requires at least one argument");
if (!arg[0].isString())
throw Exception("first argument to feval must be the name of a function (i.e., a string) a function handle, or a user defined class");
eval->getContext()->deactivateCurrentScope(); // Make feval call invisible
FuncPtr funcDef;
if (arg[0].isString()) {
QString fname = arg[0].asString();
if (!eval->lookupFunction(fname,funcDef)) {
throw Exception(QString("function ") + fname + " undefined!");
}
} else
throw Exception("argument to feval must be a string");
funcDef->updateCode(eval);
if (funcDef->scriptFlag)
throw Exception("cannot use feval on a script");
ArrayVector newarg(arg);
newarg.pop_front();
return eval->doFunction(funcDef,newarg,nargout);
}
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