expr

package

v0.0.0-...-732dac8 Latest Latest Go to latest Published: Sep 21, 2023 License: GPL-3.0 Imports: 8 Imported by: 0

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Repository

github.com/KlemensWinter/go-binio

Links

Open Source Insights

Documentation ¶

Index ¶

Variables
func Bool(val any) bool
func Compare(op Token, lhs, rhs any) (res bool, err error)
func Eval(ctx *Context, expr Expr) (any, error)
func GetFieldFn(strkt reflect.Value) func(string) (any, bool)
type BinExpr
- func (expr *BinExpr) String() string
type Call
- func (expr *Call) String() string
type Const
- func NewConst(val any) *Const
- func (expr *Const) String() string
type Context
type Expr
- func Parse(str string) (expr Expr, err error)
type Field
- func (expr *Field) String() string
type Ident
- func (expr *Ident) String() string
type Scanner
- func (s *Scanner) Init(rd io.Reader)
- func (s *Scanner) Scan() (tok Token, err error)
type Token
- func (i Token) String() string
type UnaryExpr
- func (expr *UnaryExpr) String() string
type Var
- func (expr *Var) String() string

Constants ¶

This section is empty.

Variables ¶

View Source

var (
	ErrVarNotDefined = errors.New("variable not defined")
	ErrIdentNotFound = errors.New("unknown identifier")
	ErrFieldNotFound = errors.New("field not found")
)

Functions ¶

func Bool ¶

func Bool(val any) bool

func Compare ¶

func Compare(op Token, lhs, rhs any) (res bool, err error)

func Eval ¶

func Eval(ctx *Context, expr Expr) (any, error)

func GetFieldFn ¶

func GetFieldFn(strkt reflect.Value) func(string) (any, bool)

Types ¶

type BinExpr ¶

type BinExpr struct {
	Op  Token
	Lhs Expr
	Rhs Expr
}

func (*BinExpr) String ¶

func (expr *BinExpr) String() string

type Call ¶

type Call struct {
	Name string
	Args []Expr
}

func (*Call) String ¶

func (expr *Call) String() string

type Const ¶

type Const struct {
	Value any
}

func NewConst ¶

func NewConst(val any) *Const

func (*Const) String ¶

func (expr *Const) String() string

type Context ¶

type Context struct {
	GetField func(name string) (any, bool)
	GetVar   func(name string) (any, bool)
	GetIdent func(name string) (any, bool)
}

type Expr ¶

type Expr interface {
	fmt.Stringer
}

func Parse ¶

func Parse(str string) (expr Expr, err error)

type Field ¶

type Field struct {
	Name string
}

func (*Field) String ¶

func (expr *Field) String() string

type Ident ¶

type Ident struct {
	Name string
}

func (*Ident) String ¶

func (expr *Ident) String() string

type Scanner ¶

type Scanner struct {
	scanner.Scanner
}

func (*Scanner) Init ¶

func (s *Scanner) Init(rd io.Reader)

func (*Scanner) Scan ¶

func (s *Scanner) Scan() (tok Token, err error)

type Token ¶

type Token int

const (
	INVALID Token = iota

	IDENT

	INT
	FLOAT
	FIELD

	ADD // +
	SUB // -
	MUL // *
	QUO // /

	REM // %
	DOL // $

	LSS // <
	GTR // >

	EQL // ==
	NEQ // !=
	LEQ // <=
	GEQ // >=

	LAND // &&
	LOR  // ||

	AND // &
	OR  // |

	NOT // !

	LPAREN // (
	//LBRACK // [
	//LBRACE // {
	COMMA // ,

	RPAREN // )

	EOF
)

func (Token) String ¶

func (i Token) String() string

type UnaryExpr ¶

type UnaryExpr struct {
	Op Token
	X  Expr
}

func (*UnaryExpr) String ¶

func (expr *UnaryExpr) String() string

type Var ¶

type Var struct {
	Name string
}

func (*Var) String ¶

func (expr *Var) String() string

Source Files ¶

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