Revision 7464d0e7083dd9680285c3b17c4e784d584d06eb authored by Software Heritage on 10 October 2014, 00:00:00 UTC, committed by Software Heritage on 15 October 2014, 00:00:00 UTC
0 parent
cmdLine.h
/**
* @file cmdLine.h
* @brief Command line option parsing
* @author Pascal Monasse
*
* Copyright (c) 2012-2014 Pascal Monasse
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef CMDLINE_H
#define CMDLINE_H
#include <vector>
#include <algorithm>
#include <iostream>
#include <string>
#include <sstream>
#include <cassert>
#ifdef _WIN32
#pragma warning(disable:4290) // exception specification ignored...
#endif
/// Base class for option/switch
class Option {
public:
char c; ///< Option letter (eg 's' for option -s)
bool used; ///< Does the command line use that option?
std::string longName; /// Optional long name (eg "switch" for --switch)
/// Constructor with short name/long name
Option(char d, std::string name)
: c(d), used(false), longName(name) {}
virtual ~Option() {}
virtual bool check(int& argc, char* argv[])=0; ///< Option found at argv[0]?
virtual Option* clone() const=0; ///< Copy
};
/// Option on/off is called a switch
class OptionSwitch : public Option {
public:
/// Constructor with short name/long name (optional)
OptionSwitch(char c, std::string name="")
: Option(c,name) {}
/// Find switch in argv[0]
bool check(int& argc, char* argv[]) {
if(std::string("-")+c==argv[0] ||
(!longName.empty() && std::string("--")+longName==argv[0])) {
used = true;
std::rotate(argv, argv+1, argv+argc);
argc -= 1;
return true;
} else if(std::string(argv[0]).find(std::string("-")+c)==0) {
used = true; // Handle multiple switches in single option
std::rotate(argv[0]+1, argv[0]+2,
argv[0]+std::string(argv[0]).size()+1);
return true;
}
return false;
}
/// Copy
Option* clone() const {
return new OptionSwitch(c, longName);
}
};
/// Option with an argument of type T, which must be readable by operator>>
template <class T>
class OptionField : public Option {
public:
/// Constructor. The result with be stored in variable @field.
OptionField(char c, T& field, std::string name="")
: Option(c,name), _field(field) {}
/// Find option in argv[0] and argument in argv[1]. Throw an exception
/// (type std::string) if the argument cannot be read.
bool check(int& argc, char* argv[]) {
std::string param; int arg=0;
if(std::string("-")+c==argv[0] ||
(!longName.empty() && std::string("--")+longName==argv[0])) {
if(argc<=1)
throw std::string("Option ")
+argv[0]+" requires argument";
param=argv[1]; arg=2;
} else if(std::string(argv[0]).find(std::string("-")+c)==0) {
param=argv[0]+2; arg=1;
} else if(!longName.empty() &&
std::string(argv[0]).find(std::string("--")+longName+'=')==0){
size_t size=(std::string("--")+longName+'=').size();
param=std::string(argv[0]).substr(size); arg=1;
}
if(arg>0) {
if(! read_param(param))
throw std::string("Unable to interpret ")
+param+" as argument of "+argv[0];
used = true;
std::rotate(argv, argv+arg, argv+argc);
argc -= arg;
return true;
}
return false;
}
/// Decode the string as template type T
bool read_param(const std::string& param) {
std::stringstream str(param);
return !((str >> _field).fail() || !str.eof());
}
/// Copy
Option* clone() const {
return new OptionField<T>(c, _field, longName);
}
private:
T& _field; ///< Reference to variable where to store the value
};
/// Template specialization to be able to take parameter including space.
/// Generic method would do >>_field (stops at space) and test eof (false).
template <>
inline bool OptionField<std::string>::read_param(const std::string& param) {
_field = param;
return true;
}
/// New switch option
OptionSwitch make_switch(char c, std::string name="") {
return OptionSwitch(c, name);
}
/// New option with argument.
template <class T>
OptionField<T> make_option(char c, T& field, std::string name="") {
return OptionField<T>(c, field, name);
}
/// Command line parsing
class CmdLine {
std::vector<Option*> opts;
public:
/// Destructor
~CmdLine() {
std::vector<Option*>::iterator it=opts.begin();
for(; it != opts.end(); ++it)
delete *it;
}
/// Add an option
void add(const Option& opt) {
opts.push_back( opt.clone() );
}
/// Parse of command line acting as a filter. All options are virtually
/// removed from the command line.
void process(int& argc, char* argv[]) throw(std::string) {
std::vector<Option*>::iterator it=opts.begin();
for(; it != opts.end(); ++it)
(*it)->used = false;
for(int i=1; i<argc;) {
if(std::string("--")==argv[i]) { // "--" means stop option parsing
std::rotate(argv+i, argv+i+1, argv+argc);
-- argc;
break;
}
bool found=false; // Find option
for(it=opts.begin(); it != opts.end(); ++it) {
int n = argc-i;
found = (*it)->check(n, argv+i);
if(found) {
argc = n+i;
break;
}
}
if(! found) { // A negative number is not an option
if(std::string(argv[i]).size()>1 && argv[i][0] == '-') {
std::istringstream str(argv[i]);
float v;
if(! (str>>v).eof())
throw std::string("Unrecognized option ")+argv[i];
}
++i;
}
}
}
/// Was the option used in last parsing?
bool used(char c) const {
std::vector<Option*>::const_iterator it=opts.begin();
for(; it != opts.end(); ++it)
if((*it)->c == c)
return (*it)->used;
assert(false); // Called with non-existent option, probably a bug
return false;
}
};
#endif
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