Collaboration diagram for osgEarth::Symbology::StringExpression:

Public Types
typedef std::pair< std::string, unsigned >	Variable
typedef std::vector< Variable >	Variables
Public Member Functions
	StringExpression ()
	StringExpression (const Config &conf)
	StringExpression (const std::string &expr)
	StringExpression (const StringExpression &rhs)
const Variables &	variables () const
void	set (const Variable &var, const std::string &value)
const std::string &	eval () const
const std::string &	expr () const
bool	empty () const
void	setURIContext (const URIContext &uriContext)
const URIContext &	uriContext () const
Config	getConfig () const
void	mergeConfig (const Config &conf)
Private Types
enum	Op { OPERAND, VARIABLE }
typedef std::pair< Op, std::string >	Atom
typedef std::vector< Atom >	AtomVector
Private Member Functions
void	init ()
Private Attributes
std::string	_src
AtomVector	_infix
Variables	_vars
std::string	_value
bool	_dirty
URIContext	_uriContext

Detailed Description

Simple string expression evaluator with variables.

Definition at line 92 of file Expression.

Member Typedef Documentation

typedef std::pair<Op,std::string> osgEarth::Symbology::StringExpression::Atom [private]

Definition at line 133 of file Expression.

typedef std::vector<Atom> osgEarth::Symbology::StringExpression::AtomVector [private]

Definition at line 134 of file Expression.

typedef std::pair<std::string,unsigned> osgEarth::Symbology::StringExpression::Variable

Definition at line 95 of file Expression.

typedef std::vector<Variable> osgEarth::Symbology::StringExpression::Variables

Definition at line 96 of file Expression.

Member Enumeration Documentation

enum osgEarth::Symbology::StringExpression::Op [private]

Enumerator:

OPERAND
VARIABLE

Definition at line 132 of file Expression.

{ OPERAND, VARIABLE }; // in low-high precedence order

Constructor & Destructor Documentation

osgEarth::Symbology::StringExpression::StringExpression ( ) [inline]

Definition at line 99 of file Expression.

{ }

StringExpression::StringExpression ( const Config & conf )

Definition at line 305 of file Expression.cpp.

{
    mergeConfig( conf );
    init();
}

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StringExpression::StringExpression ( const std::string & expr )

Construct a new expression from the infix string.

Definition at line 287 of file Expression.cpp.

                                                          : 
_src( expr ),
_dirty( true )
{
    init();
}

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StringExpression::StringExpression ( const StringExpression & rhs )

Copy ctor.

Definition at line 294 of file Expression.cpp.

                                                                :
_src( rhs._src ),
_vars( rhs._vars ),
_value( rhs._value ),
_infix( rhs._infix ),
_dirty( rhs._dirty ),
_uriContext( rhs._uriContext )
{
    //nop
}

Member Function Documentation

bool osgEarth::Symbology::StringExpression::empty ( ) const [inline]

Whether the expression is empty

Definition at line 122 of file Expression.

{ return _src.empty(); }

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const std::string & StringExpression::eval ( ) const

Evaluate the expression.

Definition at line 368 of file Expression.cpp.

{
    if ( _dirty )
    {
        std::stringstream buf;
        for( AtomVector::const_iterator i = _infix.begin(); i != _infix.end(); ++i )
            buf << i->second;

        const_cast<StringExpression*>(this)->_value = buf.str();
        const_cast<StringExpression*>(this)->_dirty = false;
    }

    return _value;
}

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const std::string& osgEarth::Symbology::StringExpression::expr ( ) const [inline]

Gets the expression string.

Definition at line 119 of file Expression.

{ return _src; }

Config StringExpression::getConfig ( ) const

Definition at line 319 of file Expression.cpp.

{
    return Config( "string_expression", _src );
}

void StringExpression::init ( ) [private]

Definition at line 325 of file Expression.cpp.

{
    StringTokenizer izer("", "");
    izer.addDelims( "[]", true );
    izer.addQuotes( "'\"", false );
    izer.keepEmpties() = false;
    izer.trimTokens() = false;

    StringVector t;
    izer.tokenize( _src, t );
    //tokenize(_src, t, "[]", "'\"", false, true, false);

    // identify tokens:
    bool invar = false;
    for( unsigned i=0; i<t.size(); ++i )
    {
        if ( t[i] == "[" && !invar )
        {
            invar = true;
        }
        else if ( t[i] == "]" && invar )
        {
            invar = false;
            _infix.push_back( Atom(VARIABLE,"") );
            _vars.push_back( Variable(t[i-1],0) );
        }
        else
            _infix.push_back( Atom(OPERAND,t[i]) );
    }
}

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void StringExpression::mergeConfig ( const Config & conf )

Definition at line 312 of file Expression.cpp.

{
    _src = conf.value();
    _dirty = true;
}

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void StringExpression::set	(	const Variable &	var,
		const std::string &	value
	)

Set the value of a variable.

Definition at line 357 of file Expression.cpp.

{
    Atom& a = _infix[var.second];
    if ( a.second != value )
    {
        a.second = value;
        _dirty = true;
    }
}

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void osgEarth::Symbology::StringExpression::setURIContext ( const URIContext & uriContext ) [inline]

Definition at line 124 of file Expression.

{ _uriContext = uriContext; }

const URIContext& osgEarth::Symbology::StringExpression::uriContext ( ) const [inline]

Definition at line 125 of file Expression.

{ return _uriContext; }

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const Variables& osgEarth::Symbology::StringExpression::variables ( ) const [inline]

Access the expression variables.

Definition at line 110 of file Expression.

{ return _vars; }

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Member Data Documentation

bool osgEarth::Symbology::StringExpression::_dirty [private]

Definition at line 140 of file Expression.

AtomVector osgEarth::Symbology::StringExpression::_infix [private]

Definition at line 137 of file Expression.

std::string osgEarth::Symbology::StringExpression::_src [private]

Definition at line 136 of file Expression.

URIContext osgEarth::Symbology::StringExpression::_uriContext [private]

Definition at line 141 of file Expression.

std::string osgEarth::Symbology::StringExpression::_value [private]

Definition at line 139 of file Expression.

Variables osgEarth::Symbology::StringExpression::_vars [private]

Definition at line 138 of file Expression.

The documentation for this class was generated from the following files:

/home/cube/sources/osgearth/src/osgEarthSymbology/Expression
/home/cube/sources/osgearth/src/osgEarthSymbology/Expression.cpp

osgEarth::Symbology::StringExpression Class Reference

Public Types

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Detailed Description

Member Typedef Documentation

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation