/*
* Created by Phil on 25/05/2013.
* Copyright 2013 Two Blue Cubes Ltd. All rights reserved.
*
* Distributed under the Boost Software License, Version 1.0. (See accompanying
* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*/
#ifndef TWOBLUECUBES_CLARA_H_INCLUDED
#define TWOBLUECUBES_CLARA_H_INCLUDED
#include "catch_text.h" // This will get moved out too
namespace Clara {
namespace Detail {
template<typename T> struct RemoveConstRef{ typedef T type; };
template<typename T> struct RemoveConstRef<T&>{ typedef T type; };
template<typename T> struct RemoveConstRef<T const&>{ typedef T type; };
template<typename T> struct RemoveConstRef<T const>{ typedef T type; };
template<typename T> struct IsBool { static const bool value = false; };
template<> struct IsBool<bool> { static const bool value = true; };
template<typename T>
void convertInto( std::string const& _source, T& _dest ) {
std::stringstream ss;
ss << _source;
ss >> _dest;
if( ss.fail() )
throw std::runtime_error( "Unable to convert " + _source + " to destination type" );
}
inline void convertInto( std::string const& _source, std::string& _dest ) {
_dest = _source;
}
inline void convertInto( std::string const& _source, bool& _dest ) {
std::string sourceLC = _source;
std::transform( sourceLC.begin(), sourceLC.end(), sourceLC.begin(), ::tolower );
if( sourceLC == "1" || sourceLC == "true" || sourceLC == "yes" || sourceLC == "on" )
_dest = true;
else if( sourceLC == "0" || sourceLC == "false" || sourceLC == "no" || sourceLC == "off" )
_dest = false;
else
throw std::runtime_error( "Expected a boolean value but did recognise: '" + _source + "'" );
}
inline void convertInto( bool _source, bool& _dest ) {
_dest = _source;
}
template<typename T>
inline void convertInto( bool, T& ) {
throw std::runtime_error( "Invalid conversion" );
}
template<typename ConfigT>
struct IArgFunction {
virtual ~IArgFunction() {}
virtual void set( ConfigT& config, std::string const& value ) const = 0;
virtual void setFlag( ConfigT& config ) const = 0;
virtual bool takesArg() const = 0;
virtual IArgFunction* clone() const = 0;
};
template<typename ConfigT>
class BoundArgFunction {
public:
BoundArgFunction( IArgFunction<ConfigT>* _functionObj ) : functionObj( _functionObj ) {}
BoundArgFunction( BoundArgFunction const& other ) : functionObj( other.functionObj->clone() ) {}
BoundArgFunction& operator = ( BoundArgFunction const& other ) {
IArgFunction<ConfigT>* newFunctionObj = other.functionObj->clone();
delete functionObj;
functionObj = newFunctionObj;
return *this;
}
~BoundArgFunction() { delete functionObj; }
void set( ConfigT& config, std::string const& value ) const {
functionObj->set( config, value );
}
void setFlag( ConfigT& config ) const {
functionObj->setFlag( config );
}
bool takesArg() const { return functionObj->takesArg(); }
private:
IArgFunction<ConfigT>* functionObj;
};
template<typename C>
struct NullBinder : IArgFunction<C>{
virtual void set( C&, std::string const& ) const {}
virtual void setFlag( C& ) const {}
virtual bool takesArg() const { return true; }
virtual IArgFunction<C>* clone() const { return new NullBinder( *this ); }
};
template<typename C, typename M>
struct BoundDataMember : IArgFunction<C>{
BoundDataMember( M C::* _member ) : member( _member ) {}
virtual void set( C& p, std::string const& stringValue ) const {
convertInto( stringValue, p.*member );
}
virtual void setFlag( C& p ) const {
convertInto( true, p.*member );
}
virtual bool takesArg() const { return !IsBool<M>::value; }
virtual IArgFunction<C>* clone() const { return new BoundDataMember( *this ); }
M C::* member;
};
template<typename C, typename M>
struct BoundUnaryMethod : IArgFunction<C>{
BoundUnaryMethod( void (C::*_member)( M ) ) : member( _member ) {}
virtual void set( C& p, std::string const& stringValue ) const {
typename RemoveConstRef<M>::type value;
convertInto( stringValue, value );
(p.*member)( value );
}
virtual void setFlag( C& p ) const {
typename RemoveConstRef<M>::type value;
convertInto( true, value );
(p.*member)( value );
}
virtual bool takesArg() const { return !IsBool<M>::value; }
virtual IArgFunction<C>* clone() const { return new BoundUnaryMethod( *this ); }
void (C::*member)( M );
};
template<typename C>
struct BoundNullaryMethod : IArgFunction<C>{
BoundNullaryMethod( void (C::*_member)() ) : member( _member ) {}
virtual void set( C& p, std::string const& stringValue ) const {
bool value;
convertInto( stringValue, value );
if( value )
(p.*member)();
}
virtual void setFlag( C& p ) const {
(p.*member)();
}
virtual bool takesArg() const { return false; }
virtual IArgFunction<C>* clone() const { return new BoundNullaryMethod( *this ); }
void (C::*member)();
};
template<typename C>
struct BoundUnaryFunction : IArgFunction<C>{
BoundUnaryFunction( void (*_function)( C& ) ) : function( _function ) {}
virtual void set( C& obj, std::string const& stringValue ) const {
bool value;
convertInto( stringValue, value );
if( value )
function( obj );
}
virtual void setFlag( C& p ) const {
function( p );
}
virtual bool takesArg() const { return false; }
virtual IArgFunction<C>* clone() const { return new BoundUnaryFunction( *this ); }
void (*function)( C& );
};
template<typename C, typename T>
struct BoundBinaryFunction : IArgFunction<C>{
BoundBinaryFunction( void (*_function)( C&, T ) ) : function( _function ) {}
virtual void set( C& obj, std::string const& stringValue ) const {
typename RemoveConstRef<T>::type value;
convertInto( stringValue, value );
function( obj, value );
}
virtual void setFlag( C& obj ) const {
typename RemoveConstRef<T>::type value;
convertInto( true, value );
function( obj, value );
}
virtual bool takesArg() const { return !IsBool<T>::value; }
virtual IArgFunction<C>* clone() const { return new BoundBinaryFunction( *this ); }
void (*function)( C&, T );
};
template<typename C, typename M>
BoundArgFunction<C> makeBoundField( M C::* _member ) {
return BoundArgFunction<C>( new BoundDataMember<C,M>( _member ) );
}
template<typename C, typename M>
BoundArgFunction<C> makeBoundField( void (C::*_member)( M ) ) {
return BoundArgFunction<C>( new BoundUnaryMethod<C,M>( _member ) );
}
template<typename C>
BoundArgFunction<C> makeBoundField( void (C::*_member)() ) {
return BoundArgFunction<C>( new BoundNullaryMethod<C>( _member ) );
}
template<typename C>
BoundArgFunction<C> makeBoundField( void (*_function)( C& ) ) {
return BoundArgFunction<C>( new BoundUnaryFunction<C>( _function ) );
}
template<typename C, typename T>
BoundArgFunction<C> makeBoundField( void (*_function)( C&, T ) ) {
return BoundArgFunction<C>( new BoundBinaryFunction<C, T>( _function ) );
}
} // namespace Detail
struct Parser {
Parser() : separators( " \t=:" ) {}
struct Token {
enum Type { Positional, ShortOpt, LongOpt };
Token( Type _type, std::string const& _data ) : type( _type ), data( _data ) {}
Type type;
std::string data;
};
void parseIntoTokens( int argc, char const * const * argv, std::vector<Parser::Token>& tokens ) const {
for( int i = 1; i < argc; ++i )
parseIntoTokens( argv[i] , tokens);
}
void parseIntoTokens( std::string arg, std::vector<Parser::Token>& tokens ) const {
while( !arg.empty() ) {
Parser::Token token( Parser::Token::Positional, arg );
arg = "";
if( token.data[0] == '-' ) {
if( token.data.size() > 1 && token.data[1] == '-' ) {
token = Parser::Token( Parser::Token::LongOpt, token.data.substr( 2 ) );
}
else {
token = Parser::Token( Parser::Token::ShortOpt, token.data.substr( 1 ) );
if( token.data.size() > 1 && separators.find( token.data[1] ) == std::string::npos ) {
arg = "-" + token.data.substr( 1 );
token.data = token.data.substr( 0, 1 );
}
}
}
if( token.type != Parser::Token::Positional ) {
std::size_t pos = token.data.find_first_of( separators );
if( pos != std::string::npos ) {
arg = token.data.substr( pos+1 );
token.data = token.data.substr( 0, pos );
}
}
tokens.push_back( token );
}
}
std::string separators;
};
template<typename ConfigT>
class CommandLine {
struct Arg {
Arg( Detail::BoundArgFunction<ConfigT> const& _boundField ) : boundField( _boundField ), position( -1 ) {}
bool hasShortName( std::string const& shortName ) const {
for( std::vector<std::string>::const_iterator
it = shortNames.begin(), itEnd = shortNames.end();
it != itEnd;
++it )
if( *it == shortName )
return true;
return false;
}
bool hasLongName( std::string const& _longName ) const {
return _longName == longName;
}
bool takesArg() const {
return !argName.empty();
}
bool isFixedPositional() const {
return position != -1;
}
bool isAnyPositional() const {
return position == -1 && shortNames.empty() && longName.empty();
}
std::string dbgName() const {
if( !longName.empty() )
return "--" + longName;
if( !shortNames.empty() )
return "-" + shortNames[0];
return "positional args";
}
void validate() const {
if( boundField.takesArg() && !takesArg() )
throw std::logic_error( dbgName() + " must specify an arg name" );
}
std::string commands() const {
std::ostringstream oss;
bool first = true;
std::vector<std::string>::const_iterator it = shortNames.begin(), itEnd = shortNames.end();
for(; it != itEnd; ++it ) {
if( first )
first = false;
else
oss << ", ";
oss << "-" << *it;
}
if( !longName.empty() ) {
if( !first )
oss << ", ";
oss << "--" << longName;
}
if( !argName.empty() )
oss << " <" << argName << ">";
return oss.str();
}
Detail::BoundArgFunction<ConfigT> boundField;
std::vector<std::string> shortNames;
std::string longName;
std::string description;
std::string argName;
int position;
};
class ArgBinder {
public:
template<typename F>
ArgBinder( CommandLine* cl, F f )
: m_cl( cl ),
m_arg( Detail::makeBoundField( f ) )
{}
ArgBinder( ArgBinder& other )
: m_cl( other.m_cl ),
m_arg( other.m_arg )
{
other.m_cl = NULL;
}
~ArgBinder() {
if( m_cl ) {
m_arg.validate();
if( m_arg.isFixedPositional() ) {
m_cl->m_positionalArgs.insert( std::make_pair( m_arg.position, m_arg ) );
if( m_arg.position > m_cl->m_highestSpecifiedArgPosition )
m_cl->m_highestSpecifiedArgPosition = m_arg.position;
}
else if( m_arg.isAnyPositional() ) {
if( m_cl->m_arg.get() )
throw std::logic_error( "Only one unpositional argument can be added" );
m_cl->m_arg = std::auto_ptr<Arg>( new Arg( m_arg ) );
}
else
m_cl->m_options.push_back( m_arg );
}
}
ArgBinder& shortOpt( std::string const& name ) {
m_arg.shortNames.push_back( name );
return *this;
}
ArgBinder& longOpt( std::string const& name ) {
m_arg.longName = name;
return *this;
}
ArgBinder& describe( std::string const& description ) {
m_arg.description = description;
return *this;
}
ArgBinder& argName( std::string const& argName ) {
m_arg.argName = argName;
return *this;
}
ArgBinder& position( int position ) {
m_arg.position = position;
return *this;
}
private:
CommandLine* m_cl;
Arg m_arg;
};
public:
CommandLine()
: m_boundProcessName( new Detail::NullBinder<ConfigT>() ),
m_highestSpecifiedArgPosition( 0 )
{}
CommandLine( CommandLine const& other )
: m_boundProcessName( other.m_boundProcessName ),
m_options ( other.m_options ),
m_positionalArgs( other.m_positionalArgs ),
m_highestSpecifiedArgPosition( other.m_highestSpecifiedArgPosition )
{
if( other.m_arg.get() )
m_arg = std::auto_ptr<Arg>( new Arg( *other.m_arg ) );
}
template<typename F>
ArgBinder bind( F f ) {
ArgBinder binder( this, f );
return binder;
}
template<typename F>
void bindProcessName( F f ) {
m_boundProcessName = Detail::makeBoundField( f );
}
void optUsage( std::ostream& os, std::size_t indent = 0, std::size_t width = CATCH_CONFIG_CONSOLE_WIDTH ) const {
typename std::vector<Arg>::const_iterator itBegin = m_options.begin(), itEnd = m_options.end(), it;
std::size_t maxWidth = 0;
for( it = itBegin; it != itEnd; ++it )
maxWidth = (std::max)( maxWidth, it->commands().size() );
for( it = itBegin; it != itEnd; ++it ) {
Catch::Text usage( it->commands(), Catch::TextAttributes()
.setWidth( maxWidth+indent )
.setIndent( indent ) );
// !TBD handle longer usage strings
Catch::Text desc( it->description, Catch::TextAttributes()
.setWidth( width - maxWidth -3 ) );
for( std::size_t i = 0; i < (std::max)( usage.size(), desc.size() ); ++i ) {
std::string usageCol = i < usage.size() ? usage[i] : "";
os << usageCol;
if( i < desc.size() && !desc[i].empty() )
os << std::string( indent + 2 + maxWidth - usageCol.size(), ' ' )
<< desc[i];
os << "\n";
}
}
}
std::string optUsage() const {
std::ostringstream oss;
optUsage( oss );
return oss.str();
}
void argSynopsis( std::ostream& os ) const {
for( int i = 1; i <= m_highestSpecifiedArgPosition; ++i ) {
if( i > 1 )
os << " ";
typename std::map<int, Arg>::const_iterator it = m_positionalArgs.find( i );
if( it != m_positionalArgs.end() )
os << "<" << it->second.argName << ">";
else if( m_arg.get() )
os << "<" << m_arg->argName << ">";
else
throw std::logic_error( "non consecutive positional arguments with no floating args" );
}
// !TBD No indication of mandatory args
if( m_arg.get() ) {
if( m_highestSpecifiedArgPosition > 1 )
os << " ";
os << "[<" << m_arg->argName << "> ...]";
}
}
std::string argSynopsis() const {
std::ostringstream oss;
argSynopsis( oss );
return oss.str();
}
void usage( std::ostream& os, std::string const& procName ) const {
os << "usage:\n " << procName << " ";
argSynopsis( os );
if( !m_options.empty() ) {
os << " [options]\n\nwhere options are: \n";
optUsage( os, 2 );
}
os << "\n";
}
std::string usage( std::string const& procName ) const {
std::ostringstream oss;
usage( oss, procName );
return oss.str();
}
std::vector<Parser::Token> parseInto( int argc, char const * const * argv, ConfigT& config ) const {
std::string processName = argv[0];
std::size_t lastSlash = processName.find_last_of( "/\\" );
if( lastSlash != std::string::npos )
processName = processName.substr( lastSlash+1 );
m_boundProcessName.set( config, processName );
std::vector<Parser::Token> tokens;
Parser parser;
parser.parseIntoTokens( argc, argv, tokens );
return populate( tokens, config );
}
std::vector<Parser::Token> populate( std::vector<Parser::Token> const& tokens, ConfigT& config ) const {
if( m_options.empty() && m_positionalArgs.empty() )
throw std::logic_error( "No options or arguments specified" );
std::vector<Parser::Token> unusedTokens = populateOptions( tokens, config );
unusedTokens = populateFixedArgs( unusedTokens, config );
unusedTokens = populateFloatingArgs( unusedTokens, config );
return unusedTokens;
}
std::vector<Parser::Token> populateOptions( std::vector<Parser::Token> const& tokens, ConfigT& config ) const {
std::vector<Parser::Token> unusedTokens;
for( std::size_t i = 0; i < tokens.size(); ++i ) {
Parser::Token const& token = tokens[i];
typename std::vector<Arg>::const_iterator it = m_options.begin(), itEnd = m_options.end();
for(; it != itEnd; ++it ) {
Arg const& arg = *it;
try {
if( ( token.type == Parser::Token::ShortOpt && arg.hasShortName( token.data ) ) ||
( token.type == Parser::Token::LongOpt && arg.hasLongName( token.data ) ) ) {
if( arg.takesArg() ) {
if( i == tokens.size()-1 || tokens[i+1].type != Parser::Token::Positional )
throw std::domain_error( "Expected argument to option " + token.data );
arg.boundField.set( config, tokens[++i].data );
}
else {
arg.boundField.setFlag( config );
}
break;
}
}
catch( std::exception& ex ) {
throw std::runtime_error( std::string( ex.what() ) + " while parsing: (" + arg.commands() + ")" );
}
}
if( it == itEnd )
unusedTokens.push_back( token );
}
return unusedTokens;
}
std::vector<Parser::Token> populateFixedArgs( std::vector<Parser::Token> const& tokens, ConfigT& config ) const {
std::vector<Parser::Token> unusedTokens;
int position = 1;
for( std::size_t i = 0; i < tokens.size(); ++i ) {
Parser::Token const& token = tokens[i];
typename std::map<int, Arg>::const_iterator it = m_positionalArgs.find( position );
if( it != m_positionalArgs.end() )
it->second.boundField.set( config, token.data );
else
unusedTokens.push_back( token );
if( token.type == Parser::Token::Positional )
position++;
}
return unusedTokens;
}
std::vector<Parser::Token> populateFloatingArgs( std::vector<Parser::Token> const& tokens, ConfigT& config ) const {
if( !m_arg.get() )
return tokens;
std::vector<Parser::Token> unusedTokens;
for( std::size_t i = 0; i < tokens.size(); ++i ) {
Parser::Token const& token = tokens[i];
if( token.type == Parser::Token::Positional )
m_arg->boundField.set( config, token.data );
else
unusedTokens.push_back( token );
}
return unusedTokens;
}
private:
Detail::BoundArgFunction<ConfigT> m_boundProcessName;
std::vector<Arg> m_options;
std::map<int, Arg> m_positionalArgs;
std::auto_ptr<Arg> m_arg;
int m_highestSpecifiedArgPosition;
};
} // end namespace Clara
#endif // TWOBLUECUBES_CLARA_H_INCLUDED