Function ExampleWithContext

expr_test.go:639–678

()

}

func ExampleWithContext() {
	env := map[string]any{
		"fn": func(ctx context.Context, _, _ int) int {
			// An infinite loop that can be canceled by context.
			for {
				select {
				case <-ctx.Done():
					return 42
				}
			}
		},
		"ctx": context.TODO(), // Context should be passed as a variable.
	}

	program, err := expr.Compile(`fn(1, 2)`,
		expr.Env(env),
		expr.WithContext("ctx"), // Pass context variable name.
	)
	if err != nil {
		fmt.Printf("%v", err)
		return
	}

	// Cancel context after 100 milliseconds.
	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*100)
	defer cancel()

	// After program is compiled, context can be passed to Run.
	env["ctx"] = ctx

	// Run will return 42 after 100 milliseconds.
	output, err := expr.Run(program, env)
	if err != nil {
		fmt.Printf("%v", err)
		return
	}

	fmt.Printf("%v", output)
	// Output: 42
}

func ExampleTimezone() {
	program, err := expr.Compile(`now().Location().String()`, expr.Timezone("Asia/Kamchatka"))