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package errors
import (
"fmt"
"strings"
"github.com/onsi/gomega/types"
)
// A stateful matcher that nests other matchers within it and preserves the error types of the
// nested matcher failures.
type NestingMatcher interface {
types.GomegaMatcher
// Returns the failures of nested matchers.
Failures() []error
}
// An error type for labeling errors on deeply nested matchers.
type NestedError struct {
Path string
Err error
}
func (e *NestedError) Error() string {
// Indent Errors.
indented := strings.Replace(e.Err.Error(), "\n", "\n\t", -1)
return fmt.Sprintf("%s:\n\t%v", e.Path, indented)
}
// Create a NestedError with the given path.
// If err is a NestedError, prepend the path to it.
// If err is an AggregateError, recursively Nest each error.
func Nest(path string, err error) error {
if ag, ok := err.(AggregateError); ok {
var errs AggregateError
for _, e := range ag {
errs = append(errs, Nest(path, e))
}
return errs
}
if ne, ok := err.(*NestedError); ok {
return &NestedError{
Path: path + ne.Path,
Err: ne.Err,
}
}
return &NestedError{
Path: path,
Err: err,
}
}
// An error type for treating multiple errors as a single error.
type AggregateError []error
// Error is part of the error interface.
func (err AggregateError) Error() string {
if len(err) == 0 {
// This should never happen, really.
return ""
}
if len(err) == 1 {
return err[0].Error()
}
result := fmt.Sprintf("[%s", err[0].Error())
for i := 1; i < len(err); i++ {
result += fmt.Sprintf(", %s", err[i].Error())
}
result += "]"
return result
}
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