FormulaParserBase Class Reference

Base class with the non-templated part of the formula parser. More...

#include <FormulaParser.h>

Inheritance diagram for FormulaParserBase:

Public Types
enum class	EOperator : unsigned char {   c_noop = 0x00 ,   c_roundBracketOpen = 0x01 ,   c_roundBracketClose = 0x02 ,   c_squareBracketOpen = 0x03 ,   c_squareBracketClose = 0x04 ,   c_plus = 0x11 ,   c_minus = 0x12 ,   c_multiply = 0x21 ,   c_divide = 0x22 ,   c_power = 0x31 }
	List of known operators. More...
enum class	ENumberStatus {   c_Invalid ,   c_Empty ,   c_Sign ,   c_Int ,   c_Dot ,   c_LeadingDot ,   c_Float ,   c_Exponent ,   c_ExponentSign ,   c_Scientific }
	States of a string literal when checking if it is a valid number. More...
typedef std::variant< std::string, double >	InputToken
	Input token type: an input tokein is either a string or a float variable.

Public Member Functions
	FormulaParserBase ()=default
	Default constructor.
virtual	~FormulaParserBase ()=default
	virtual, but empty destructor

Static Public Member Functions
static char	operatorToChar (EOperator op) noexcept
	Convert operator code to character.
static double	applyOperator (EOperator op, double a, double b)
	Apply operator on two values.
static ENumberStatus	checkNumber (ENumberStatus current, char next)
	Check if a string literal with a given number status continues to be a valid number if next is appended to it.

Protected Member Functions
virtual void	executeOperator (EOperator op)=0
	Execute an operator on the current state.
virtual void	addVariable (const InputToken &token)=0
	Add a variable token to the current state.
void	processString (const std::string &formula)
	Process the given formula and store the final state.
void	raiseError (const std::runtime_error &e)
	Format the given runtime_error with context information and rethrow a new one.

Static Protected Member Functions
static void	assertOperatorUsable (size_t stacksize)
	Make sure we have enough operands to use an operator.

Private Member Functions
void	addOperator (EOperator op)
	Add an operator to the internal state, convert them to reverse polish notation using the shunting yard algorithm and execute them as they become available.
void	flushCurrentVariable ()
	Flush the currently parsed variable name and add it to the state either as variable or number.
void	flushPendingOperators ()
	Flush all pending operators at the end of processing.
EOperator	checkForOperator (char next)
	Check if the next character is a operator.

Private Attributes
bool	m_lastTokenWasOperator
	Bool to check whether there were consecutive operators or variables.
std::istringstream	m_buffer
	Buffer for the formula.
std::string	m_currentVariableName
	collect characters into a variable name
ENumberStatus	m_currentVariableNameNumberStatus
	State of the current variable name being a valid float literal.
std::stack< EOperator >	m_operatorStack
	Stack of operators for the Shunting-yard algorithm.

Detailed Description

Base class with the non-templated part of the formula parser.

Not very useful on its own.

See also

FormulaParser

Definition at line 27 of file FormulaParser.h.

Member Typedef Documentation

InputToken

typedef std::variant<std::string, double> InputToken

Input token type: an input tokein is either a string or a float variable.

Definition at line 59 of file FormulaParser.h.

Member Enumeration Documentation

ENumberStatus

enum class ENumberStatus

strong

States of a string literal when checking if it is a valid number.

Enumerator
c_Invalid	Not a valid number.
c_Empty	Empty string.
c_Sign	Leading sign.
c_Int	[leading sign] + digits
c_Dot	[leading sign] + digits + dot
c_LeadingDot	leading dot without preceding digits
c_Float	[leading sign] + [digits] + dot + digits
c_Exponent	[float] + E or e
c_ExponentSign	exponent followed by plus or minus
c_Scientific	exponent followed by sign and digits

Definition at line 45 of file FormulaParser.h.

                             {
      c_Invalid,      
      c_Empty,        
      c_Sign,         
      c_Int,          
      c_Dot,          
      c_LeadingDot,   
      c_Float,        
      c_Exponent,     
      c_ExponentSign, 
      c_Scientific    
    };

EOperator

enum class EOperator : unsigned char

strong

List of known operators.

The second word encodes the operator precedence

Enumerator
c_noop	No operation.
c_roundBracketOpen	Open round bracket.
c_roundBracketClose	Close round bracket.
c_squareBracketOpen	Open square bracket.
c_squareBracketClose	Close square bracket.
c_plus	Addition.
c_minus	Subtraction.
c_multiply	Multiply.
c_divide	Division.
c_power	Exponentation.

Definition at line 31 of file FormulaParser.h.

                         : unsigned char {
      c_noop               = 0x00, 
      c_roundBracketOpen   = 0x01, 
      c_roundBracketClose  = 0x02, 
      c_squareBracketOpen  = 0x03, 
      c_squareBracketClose = 0x04, 
      c_plus               = 0x11, 
      c_minus              = 0x12, 
      c_multiply           = 0x21, 
      c_divide             = 0x22, 
      c_power              = 0x31  
    };

Member Function Documentation

addVariable()

virtual void addVariable ( const InputToken &  token )

protectedpure virtual

Add a variable token to the current state.

Implemented in FormulaParser< VariableConstructor >.

executeOperator()

virtual void executeOperator ( EOperator  op )

protectedpure virtual

Execute an operator on the current state.

Implemented in FormulaParser< VariableConstructor >.

Member Data Documentation

m_buffer

std::istringstream m_buffer

private

Buffer for the formula.

Definition at line 103 of file FormulaParser.h.

m_currentVariableName

std::string m_currentVariableName

private

collect characters into a variable name

Definition at line 105 of file FormulaParser.h.

m_currentVariableNameNumberStatus

ENumberStatus m_currentVariableNameNumberStatus

private

State of the current variable name being a valid float literal.

Definition at line 107 of file FormulaParser.h.

m_lastTokenWasOperator

bool m_lastTokenWasOperator

private

Bool to check whether there were consecutive operators or variables.

Definition at line 101 of file FormulaParser.h.

m_operatorStack

std::stack<EOperator> m_operatorStack

private

Stack of operators for the Shunting-yard algorithm.

Definition at line 109 of file FormulaParser.h.

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

• framework/utilities/include/FormulaParser.h
• framework/utilities/src/FormulaParser.cc