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package formula
import (
"fmt"
"os"
"strconv"
"strings"
)
// The Formula interface is implemented by any type that
// may be handled as a formula.
type Formula interface {
Meta() *Meta
Config() *Config
}
// ParseId splits a formula identifier into its constituting parts.
func ParseId(id string) (namespace string, name string, rev int, err os.Error) {
colon := strings.Index(id, ":")
if colon == -1 {
err = errorf("Missing formula namespace: %q", id)
return
}
dash := strings.LastIndex(id, "-")
if dash != -1 {
rev, err = strconv.Atoi(id[dash+1:])
}
if dash == -1 || err != nil {
err = errorf("Missing formula revision: %q", id)
return
}
namespace = id[:colon]
name = id[colon+1 : dash]
return
}
func errorf(format string, args ...interface{}) os.Error {
return os.NewError(fmt.Sprintf(format, args...))
}
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