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// Copyright 2014 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
// The keyvalues package implements a set of functions for parsing key=value data,
// usually passed in as command-line parameters to juju subcommands, e.g.
// juju-set mongodb logging=true
package keyvalues
import (
"fmt"
"strings"
)
// DuplicateError signals that a duplicate key was encountered while parsing
// the input into a map.
type DuplicateError string
func (e DuplicateError) Error() string {
return string(e)
}
// Parse parses the supplied string slice into a map mapping
// keys to values. Duplicate keys cause an error to be returned.
func Parse(src []string, allowEmptyValues bool) (map[string]string, error) {
results := map[string]string{}
for _, kv := range src {
parts := strings.SplitN(kv, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf(`expected "key=value", got %q`, kv)
}
key, value := strings.TrimSpace(parts[0]), strings.TrimSpace(parts[1])
if len(key) == 0 || (!allowEmptyValues && len(value) == 0) {
return nil, fmt.Errorf(`expected "key=value", got "%s=%s"`, key, value)
}
if _, exists := results[key]; exists {
return nil, DuplicateError(fmt.Sprintf("key %q specified more than once", key))
}
results[key] = value
}
return results, nil
}
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