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tag.go
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tag.go
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package goenv
import (
"github.com/pkg/errors"
"strconv"
"strings"
)
// common
const (
TagSplitChar = ";"
TagSliceSplitChar = ","
TagMapSplitChar = "|"
TagName = "name"
TagValueChar = ":"
TagDefaultSig = "default"
TagSkipSig = "-"
TagRequiredSig = "required"
TagInline = "inline"
)
type Tag struct {
Name string
Default string
Required bool
Number *NumberTag
Inline bool
}
// number
const (
TagNumberLessThan = "lt"
TagNumberLessOrEqual = "lte"
TagNumberGreaterThan = "gt"
TagNumberGreaterOrEqual = "gte"
)
type NumberTag struct {
LessThan *float64
LessOrEqual *float64
GreaterThan *float64
GreaterOrEqual *float64
}
func (t *NumberTag) set(key, value string) error {
v, err := strconv.ParseFloat(value, 64)
if err != nil {
return err
}
switch key {
case TagNumberLessThan:
t.LessThan = &v
case TagNumberLessOrEqual:
t.LessOrEqual = &v
case TagNumberGreaterThan:
t.GreaterThan = &v
case TagNumberGreaterOrEqual:
t.GreaterOrEqual = &v
}
return nil
}
func (t *NumberTag) check(val float64) error {
if t.LessThan != nil && val >= *t.LessThan {
return errors.Errorf("%f should be less than %f", val, *t.LessThan)
}
if t.LessOrEqual != nil && val > *t.LessOrEqual {
return errors.Errorf("%f should be less or equal to %f", val, *t.LessOrEqual)
}
if t.GreaterThan != nil && val <= *t.GreaterThan {
return errors.Errorf("%f should be greater than %f", val, *t.GreaterThan)
}
if t.GreaterOrEqual != nil && val < *t.GreaterOrEqual {
return errors.Errorf("%f should be greater or equal to %f", val, *t.GreaterOrEqual)
}
return nil
}
func ParseTag(info string) (*Tag, error) {
if info == "" {
return nil, nil
}
vals := strings.Split(info, TagSplitChar)
res := &Tag{}
for _, val := range vals {
switch val {
case TagSkipSig:
continue
case TagRequiredSig:
res.Required = true
case TagInline:
res.Inline = true
default:
index := strings.Index(val, TagValueChar)
if index == -1 {
res.Name = val
} else {
tagVal := strings.TrimSpace(val[index+1:])
switch val[:index] {
case TagName:
res.Name = tagVal
case TagDefaultSig:
res.Default = tagVal
case TagNumberLessThan, TagNumberLessOrEqual, TagNumberGreaterThan, TagNumberGreaterOrEqual:
if res.Number == nil {
res.Number = &NumberTag{}
}
if err := res.Number.set(val[:index], tagVal); err != nil {
return nil, err
}
}
}
//l := strings.Split(val, TagValueChar)
//if len(l) < 2 {
// res.Name = l[0]
//} else {
// tagVal := strings.TrimSpace(l[1])
// switch l[0] {
// case TagName:
// res.Name = tagVal
// case TagDefaultSig:
// res.Default = tagVal
// case TagNumberLessThan, TagNumberLessOrEqual, TagNumberGreaterThan, TagNumberGreaterOrEqual:
// if res.Number == nil {
// res.Number = &NumberTag{}
// }
// if err := res.Number.set(l[0], tagVal); err != nil {
// return nil, err
// }
// }
//}
}
}
return res, nil
}