SCalc::ParserResult Class Reference

The result of an SCalc::Session::eval(). More...

#include <expression.hh>

Inheritance diagram for SCalc::ParserResult:

Public Member Functions
	ParserResult (Session *s)
	Constructors/desctructors:
Session *	session ()
	The SCalc::Session object used. More...
virtual std::string	pretty_print ()=0
	Pretty printing of the result ?
virtual int	can_delete ()
Conversion functions
ParserResult as such is not directly usable: you need to check its actual type and convert it to an appropriate subtype with these functions.
virtual int	is_expression ()
	Is it a SCalc::Expression ? More...
Expression *	to_expression ()
	Converts to SCalc::Expression. More...
virtual int	is_syntax_error ()
	Is it a SCalc::SyntaxError ? More...
SyntaxError *	to_syntax_error ()
	Converts to SCalc::SyntaxError. More...
virtual int	is_func_def ()
	Is it a SCalc::FuncDef ? More...
FuncDef *	to_func_def ()
	Converts to SCalc::FuncDef. More...

Detailed Description

The result of an SCalc::Session::eval().

The base class for all the things the parser can return. As the parser can return quite a whole bunch of different things, it is not wise to use SCalc::Expression as the carrier for all. Instead, here comes this small wrapper that enables one to check the return type of everything. A ParserResult can be:

• a SCalc::Expression, when the string evaluated to a normal expression
• a SCalc::FuncDef, when the strings evaluated to a function definition
• a SCalc::SyntaxError, when a syntax error was detected.

Member Function Documentation

virtual int SCalc::ParserResult::can_delete ( )

inlinevirtual

Whether or not we can freely delete this result = nearly always yes, unless it is a named function

Reimplemented in SCalc::FuncDef.

virtual int SCalc::ParserResult::is_expression ( )

inlinevirtual

Is it a SCalc::Expression ?

Returns true if the object is a SCalc::Expression or one of its children.

Reimplemented in SCalc::Expression.

Referenced by to_expression().

virtual int SCalc::ParserResult::is_func_def ( )

inlinevirtual

Is it a SCalc::FuncDef ?

Returns true if the object is a SCalc::FuncDef or one of its children.

Reimplemented in SCalc::FuncDef.

Referenced by to_func_def().

virtual int SCalc::ParserResult::is_syntax_error ( )

inlinevirtual

Is it a SCalc::SyntaxError ?

Returns true if the object is a SCalc::SyntaxError or one of its children.

Reimplemented in SCalc::SyntaxError.

Referenced by to_syntax_error().

Session* SCalc::ParserResult::session ( )

inline

The SCalc::Session object used.

Returns the SCalc::Session in which the expression was parsed.

Referenced by SCalc::Expression::evaluable().

Expression* SCalc::ParserResult::to_expression ( )

inline

Converts to SCalc::Expression.

Returns a SCalc::Expression object or NULL if the object isn't an expression.

References is_expression().

FuncDef* SCalc::ParserResult::to_func_def ( )

inline

Converts to SCalc::FuncDef.

Returns a SCalc::FuncDef object or NULL if the object doesn't represent a function definition.

References is_func_def().

SyntaxError* SCalc::ParserResult::to_syntax_error ( )

inline

Converts to SCalc::SyntaxError.

Returns a SCalc::SyntaxError object or NULL if the object doesn't represent a syntax error.

References is_syntax_error().

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

• lib/expression.hh