91 lines
2.4 KiB
Go
91 lines
2.4 KiB
Go
// Copyright 2019 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package util
|
|
|
|
import (
|
|
"strconv"
|
|
)
|
|
|
|
// TODO(mdlayher): util packages are an anti-pattern and this should be moved
|
|
// somewhere else that is more focused in the future.
|
|
|
|
// A ValueParser enables parsing a single string into a variety of data types
|
|
// in a concise and safe way. The Err method must be invoked after invoking
|
|
// any other methods to ensure a value was successfully parsed.
|
|
type ValueParser struct {
|
|
v string
|
|
err error
|
|
}
|
|
|
|
// NewValueParser creates a ValueParser using the input string.
|
|
func NewValueParser(v string) *ValueParser {
|
|
return &ValueParser{v: v}
|
|
}
|
|
|
|
// Int interprets the underlying value as an int and returns that value.
|
|
func (vp *ValueParser) Int() int { return int(vp.int64()) }
|
|
|
|
// PInt64 interprets the underlying value as an int64 and returns a pointer to
|
|
// that value.
|
|
func (vp *ValueParser) PInt64() *int64 {
|
|
if vp.err != nil {
|
|
return nil
|
|
}
|
|
|
|
v := vp.int64()
|
|
return &v
|
|
}
|
|
|
|
// int64 interprets the underlying value as an int64 and returns that value.
|
|
// TODO: export if/when necessary.
|
|
func (vp *ValueParser) int64() int64 {
|
|
if vp.err != nil {
|
|
return 0
|
|
}
|
|
|
|
// A base value of zero makes ParseInt infer the correct base using the
|
|
// string's prefix, if any.
|
|
const base = 0
|
|
v, err := strconv.ParseInt(vp.v, base, 64)
|
|
if err != nil {
|
|
vp.err = err
|
|
return 0
|
|
}
|
|
|
|
return v
|
|
}
|
|
|
|
// PUInt64 interprets the underlying value as an uint64 and returns a pointer to
|
|
// that value.
|
|
func (vp *ValueParser) PUInt64() *uint64 {
|
|
if vp.err != nil {
|
|
return nil
|
|
}
|
|
|
|
// A base value of zero makes ParseInt infer the correct base using the
|
|
// string's prefix, if any.
|
|
const base = 0
|
|
v, err := strconv.ParseUint(vp.v, base, 64)
|
|
if err != nil {
|
|
vp.err = err
|
|
return nil
|
|
}
|
|
|
|
return &v
|
|
}
|
|
|
|
// Err returns the last error, if any, encountered by the ValueParser.
|
|
func (vp *ValueParser) Err() error {
|
|
return vp.err
|
|
}
|