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package cty
import (
"fmt"
)
// PathError is a specialization of error that represents where in a
// potentially-deep data structure an error occured, using a Path.
type PathError struct {
error
Path Path
}
func errorf(path Path, f string, args ...interface{}) error {
// We need to copy the Path because often our caller builds it by
// continually mutating the same underlying buffer.
sPath := make(Path, len(path))
copy(sPath, path)
return PathError{
error: fmt.Errorf(f, args...),
Path: sPath,
}
}
// NewErrorf creates a new PathError for the current path by passing the
// given format and arguments to fmt.Errorf and then wrapping the result
// similarly to NewError.
func (p Path) NewErrorf(f string, args ...interface{}) error {
return errorf(p, f, args...)
}
// NewError creates a new PathError for the current path, wrapping the given
// error.
func (p Path) NewError(err error) error {
// if we're being asked to wrap an existing PathError then our new
// PathError will be the concatenation of the two paths, ensuring
// that we still get a single flat PathError that's thus easier for
// callers to deal with.
perr, wrappingPath := err.(PathError)
pathLen := len(p)
if wrappingPath {
pathLen = pathLen + len(perr.Path)
}
sPath := make(Path, pathLen)
copy(sPath, p)
if wrappingPath {
copy(sPath[len(p):], perr.Path)
}
return PathError{
error: err,
Path: sPath,
}
}
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