predicate

README

Predicate

Predicate is a simple library for evaluating predicates (boolean functions) and getting a textual representation of them.

Documentation

Index

• Constants
• func String(p *Predicate) (r string)
• type NameBool
• type Predicate
  • func False() (r *Predicate)
  • func NewTerm(s string) (p *Predicate)
  • func Parse(source io.Reader) (p *Predicate, e error)
  • func Reduce(p *Predicate, interp NameBool) (r *Predicate)
  • func True() (r *Predicate)
  • func (p *Predicate) From(m map[string]interface{}, f func(string) (func() (bool, bool), func() string)) (e error)
  • func (p *Predicate) To() (m map[string]interface{})
  • func (p *Predicate) Valid() (ok bool)

Constants

const (
	NotOp          = "¬"
	AndOp          = "∧"
	OrOp           = "∨"
	EquivalesOp    = "≡"
	NotEquivalesOp = "≢"
	ImpliesOp      = "⇒"
	Term           = "term"
)

const (
	OperandAK = "a"
	OperandBK = "b"
	StrK      = "str"
)

Functions

func String

func String(p *Predicate) (r string)

Types

type NameBool

type NameBool func(string) (bool, bool)

type Predicate

type Predicate struct {
	Operator string     `json:"operator"`
	A        *Predicate `json:"a"`
	B        *Predicate `json:"b"`
	String   string     `json:"string"`
}

func False

func False() (r *Predicate)

func NewTerm

func NewTerm(s string) (p *Predicate)

func Parse

func Parse(source io.Reader) (p *Predicate, e error)

func Reduce

func Reduce(p *Predicate, interp NameBool) (r *Predicate)

func True

func True() (r *Predicate)

func (*Predicate) From

func (p *Predicate) From(m map[string]interface{},
	f func(string) (func() (bool, bool), func() string)) (e error)

func (*Predicate) To

func (p *Predicate) To() (m map[string]interface{})

func (*Predicate) Valid

func (p *Predicate) Valid() (ok bool)