parser

Documentation

Index

• func GetVarList(expr interfaces.Expression) []string
• type Parser
  • func NewParser() *Parser
  • func (p *Parser) AddFunction(f funcs.FuncType, s string)
  • func (p *Parser) Evaluate(vars map[string]decimal.Decimal) (decimal.Decimal, error)
  • func (p *Parser) GetFunctions() [funcs.LevelsOfPriorities]map[string]funcs.FuncType
  • func (p *Parser) Parse(str string) (interfaces.Expression, error)
  • func (p *Parser) String() string

Functions

func GetVarList

func GetVarList(expr interfaces.Expression) []string

GetVarList - return list of variables which are used in the expression

Types

type Parser

type Parser struct {
	Operators  [funcs.LevelsOfPriorities]map[string]funcs.FuncType
	Expression interfaces.Expression
}

Parser - context structure, which contains user-defined function

func NewParser

func NewParser() *Parser

NewParser - create a Parser object with default set of operators and functions

func (*Parser) AddFunction

func (p *Parser) AddFunction(f funcs.FuncType, s string)

AddFunction - add user's function and it string representation

func (*Parser) Evaluate

func (p *Parser) Evaluate(vars map[string]decimal.Decimal) (decimal.Decimal, error)

Evaluate - execute expression and return result

func (*Parser) GetFunctions

func (p *Parser) GetFunctions() [funcs.LevelsOfPriorities]map[string]funcs.FuncType

func (*Parser) Parse

func (p *Parser) Parse(str string) (interfaces.Expression, error)

Parse - parsing a string format math expression, return Exp tree

func (*Parser) String

func (p *Parser) String() string

String - string representation of expression