expr

package

v0.1.3 Latest Latest Go to latest Published: Jul 11, 2021 License: MIT Imports: 11 Imported by: 10

Details

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Repository

github.com/mkideal/pkg

Links

Open Source Insights

README ¶

Moved to https://github.com/mkideal/expr

Documentation ¶

Index ¶

Variables
func Equal(v1, v2 Value) bool
func ExpectNArg(got, want int) error
type Expr
- func New(s string, pool *Pool) (*Expr, error)
- func (e *Expr) Eval(getter VarGetter) (Value, error)
type Func
type Getter
- func (getter Getter) GetVar(name string) (Value, bool)
type Kind
type Pool
- func MustNewPool(factories ...map[string]Func) *Pool
- func NewPool(factories ...map[string]Func) (*Pool, error)
- func (p *Pool) SetOnVarMissing(fn VarMissingFunc)
type Value
type VarGetter
type VarMissingFunc

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	ErrFailedToParseInteger  = errors.New("failed to parse integer")
	ErrFailedToParseFloat    = errors.New("failed to parse float")
	ErrNotAnInteger          = errors.New("not an integer")
	ErrNotAFloat             = errors.New("not a float")
	ErrUnsupportedType       = errors.New("unsupported type")
	ErrTypeMismatchForOp     = errors.New("type mismatch for operater")
	ErrDivideZero            = errors.New("divide zero")
	ErrPowOfZero             = errors.New("power of zero")
	ErrComparedTypesMismatch = errors.New("compared types mismatch")
	ErrBadArgumentsSize      = errors.New("bad arguments size")
)

Functions ¶

func Equal ¶

func Equal(v1, v2 Value) bool

func ExpectNArg ¶

func ExpectNArg(got, want int) error

Types ¶

type Expr ¶

type Expr struct {
	// contains filtered or unexported fields
}

Expr is top-level object of expr package

func New ¶

func New(s string, pool *Pool) (*Expr, error)

New creates an Expr and parses string s, pool can be nil

func (*Expr) Eval ¶

func (e *Expr) Eval(getter VarGetter) (Value, error)

Eval calculate the expression getter maybe nil

type Func ¶

type Func func(...Value) (Value, error)

type Getter ¶

type Getter map[string]Value

default VarGetter implementation

func (Getter) GetVar ¶

func (getter Getter) GetVar(name string) (Value, bool)

GetVar gets the value of variable

type Kind ¶

type Kind int

const (
	KindInvalid Kind = iota
	KindInt
	KindFloat
	KindString
)

type Pool ¶

type Pool struct {
	// contains filtered or unexported fields
}

func MustNewPool ¶

func MustNewPool(factories ...map[string]Func) *Pool

func NewPool ¶

func NewPool(factories ...map[string]Func) (*Pool, error)

func (*Pool) SetOnVarMissing ¶

func (p *Pool) SetOnVarMissing(fn VarMissingFunc)

type Value ¶

type Value struct {
	// contains filtered or unexported fields
}

func Bool ¶

func Bool(ok bool) Value

func DefaultOnVarMissing ¶

func DefaultOnVarMissing(varName string) (Value, error)

func Eval ¶

func Eval(s string, getter map[string]Value, pool *Pool) (Value, error)

Eval calculate expression with pool(maybe nil)

func False ¶

func False() Value

func Float ¶

func Float(f float64) Value

func Int ¶

func Int(i int64) Value

func NewValue ¶

func NewValue(kind Kind) Value

func Nil ¶

func Nil() Value

func String ¶

func String(s string) Value

func True ¶

func True() Value

func Zero ¶

func Zero() Value

func (Value) Add ¶

func (v Value) Add(v2 Value) (Value, error)

func (Value) And ¶

func (v Value) And(v2 Value) Value

func (Value) Bool ¶

func (v Value) Bool() bool

func (Value) Contains ¶

func (v Value) Contains(v2 Value) Value

func (Value) Eq ¶

func (v Value) Eq(v2 Value) (Value, error)

func (Value) Float ¶

func (v Value) Float() float64

func (Value) Ge ¶

func (v Value) Ge(v2 Value) (Value, error)

func (Value) Gt ¶

func (v Value) Gt(v2 Value) (Value, error)

func (Value) Int ¶

func (v Value) Int() int64

func (Value) Kind ¶

func (v Value) Kind() Kind

func (Value) Le ¶

func (v Value) Le(v2 Value) (Value, error)

func (Value) Lt ¶

func (v Value) Lt(v2 Value) (Value, error)

func (Value) Mul ¶

func (v Value) Mul(v2 Value) (Value, error)

func (Value) Ne ¶

func (v Value) Ne(v2 Value) (Value, error)

func (Value) Not ¶

func (v Value) Not() Value

func (Value) Or ¶

func (v Value) Or(v2 Value) Value

func (Value) Pow ¶

func (v Value) Pow(v2 Value) (Value, error)

func (Value) Quo ¶

func (v Value) Quo(v2 Value) (Value, error)

func (Value) Rem ¶

func (v Value) Rem(v2 Value) (Value, error)

func (*Value) Set ¶

func (v *Value) Set(s string) error

func (Value) String ¶

func (v Value) String() string

func (Value) Sub ¶

func (v Value) Sub(v2 Value) (Value, error)

type VarGetter ¶

type VarGetter interface {
	GetVar(string) (Value, bool)
}

VarGetter defines interface for getting value of variable

type VarMissingFunc ¶

type VarMissingFunc func(string) (Value, error)

Source Files ¶

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