mirror of https://github.com/perkeep/perkeep.git
75 lines
1.7 KiB
Go
75 lines
1.7 KiB
Go
/*
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Copyright 2015 The Perkeep Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package conv contains utilities for parsing values delimited by spaces.
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package conv // import "perkeep.org/pkg/conv"
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import (
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"bytes"
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"errors"
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"fmt"
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"perkeep.org/pkg/blob"
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"go4.org/strutil"
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)
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func ParseFields(v []byte, dst ...interface{}) error {
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for i, dv := range dst {
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thisv := v
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if i < len(dst)-1 {
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sp := bytes.IndexByte(v, ' ')
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if sp == -1 {
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return fmt.Errorf("missing space following field index %d", i)
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}
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thisv = v[:sp]
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v = v[sp+1:]
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}
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switch dv := dv.(type) {
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case *blob.Ref:
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br, ok := blob.ParseBytes(thisv)
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if !ok {
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return fmt.Errorf("invalid blobref %q", thisv)
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}
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*dv = br
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case *uint32:
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n, err := strutil.ParseUintBytes(thisv, 10, 32)
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if err != nil {
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return err
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}
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*dv = uint32(n)
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case *uint64:
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n, err := strutil.ParseUintBytes(thisv, 10, 64)
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if err != nil {
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return err
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}
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*dv = n
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case *int64:
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n, err := strutil.ParseUintBytes(thisv, 10, 64)
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if err != nil {
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return err
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}
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if int64(n) < 0 {
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return errors.New("conv: negative numbers not accepted with int64 dest type")
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}
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*dv = int64(n)
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default:
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return fmt.Errorf("conv: unsupported target pointer type %T", dv)
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}
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}
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return nil
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}
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