repl

Documentation

Overview

Package repl implements a Read-Eval-Print-Loop (REPL) for interacting with the policy engine.

The REPL is typically used from the command line, however, it can also be used as a library.

Index

• Constants
• type Error
  • func (err *Error) Error() string
• type REPL
  • func New(store storage.Store, historyPath string, output io.Writer, outputFormat string, ...) *REPL
  • func (r *REPL) DisableMultiLineBuffering(yes bool) *REPL
  • func (r *REPL) DisableUndefinedOutput(yes bool) *REPL
  • func (r *REPL) Loop(ctx context.Context)
  • func (r *REPL) OneShot(ctx context.Context, line string) error

Examples

• REPL.OneShot

Constants

const (
	// BadArgsErr indicates bad arguments were provided to a built-in REPL
	// command.
	BadArgsErr string = "bad arguments"
)

Types

type Error

type Error struct {
	Code    string
	Message string
}

Error is the error type returned by the REPL.

func (*Error) Error

func (err *Error) Error() string

type REPL

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

REPL represents an instance of the interactive shell.

func New

func New(store storage.Store, historyPath string, output io.Writer, outputFormat string, errLimit int, banner string) *REPL

New returns a new instance of the REPL.

func (*REPL) DisableMultiLineBuffering

func (r *REPL) DisableMultiLineBuffering(yes bool) *REPL

DisableMultiLineBuffering causes the REPL to not buffer lines when a parse error occurs. Instead, the error will be returned to the caller.

func (*REPL) DisableUndefinedOutput

func (r *REPL) DisableUndefinedOutput(yes bool) *REPL

DisableUndefinedOutput causes the REPL to not print any output when the query is undefined.

func (*REPL) Loop

func (r *REPL) Loop(ctx context.Context)

Loop will run until the user enters "exit", Ctrl+C, Ctrl+D, or an unexpected error occurs.

func (*REPL) OneShot

func (r *REPL) OneShot(ctx context.Context, line string) error

OneShot evaluates the line and prints the result. If an error occurs it is returned for the caller to display.

Example

Output:

true