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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,107 @@ | ||
| package internal | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "reflect" | ||
| "strings" | ||
| ) | ||
|
|
||
| // RuleSetError is a container for transferring multiple errors reported by [govy.RuleSet]. | ||
| // It is intentionally not exported as it is only an intermediate stage before the | ||
| // aggregated errors are flattened. | ||
| type RuleSetError []error | ||
|
|
||
| func (r RuleSetError) Error() string { | ||
| b := new(strings.Builder) | ||
| JoinErrors(b, r, "") | ||
| return b.String() | ||
| } | ||
|
|
||
| // JoinErrors joins multiple errors into a single pretty-formmated string. | ||
| func JoinErrors[T error](b *strings.Builder, errs []T, indent string) { | ||
| for i, err := range errs { | ||
| buildErrorMessage(b, err.Error(), indent) | ||
| if i < len(errs)-1 { | ||
| b.WriteString("\n") | ||
| } | ||
| } | ||
| } | ||
|
|
||
| const listPoint = "- " | ||
|
|
||
| func buildErrorMessage(b *strings.Builder, errMsg, indent string) { | ||
| b.WriteString(indent) | ||
| if !strings.HasPrefix(errMsg, listPoint) { | ||
| b.WriteString(listPoint) | ||
| } | ||
| // Indent the whole error message. | ||
| errMsg = strings.ReplaceAll(errMsg, "\n", "\n"+indent) | ||
| b.WriteString(errMsg) | ||
| } | ||
|
|
||
| var newLineReplacer = strings.NewReplacer("\n", "\\n", "\r", "\\r") | ||
|
|
||
| // PropertyValueString returns the string representation of the given value. | ||
| // Structs, interfaces, maps and slices are converted to compacted JSON strings. | ||
| // It tries to improve readability by: | ||
| // - limiting the string to 100 characters | ||
| // - removing leading and trailing whitespaces | ||
| // - escaping newlines | ||
| // If value is a struct implementing [fmt.Stringer] String method will be used | ||
| // only if the struct does not contain any JSON tags. | ||
| func PropertyValueString(v interface{}) string { | ||
| if v == nil { | ||
| return "" | ||
| } | ||
| rv := reflect.ValueOf(v) | ||
| ft := reflect.Indirect(rv) | ||
| var s string | ||
| switch ft.Kind() { | ||
| case reflect.Interface, reflect.Map, reflect.Slice: | ||
| if reflect.ValueOf(v).IsZero() { | ||
| break | ||
| } | ||
| raw, _ := json.Marshal(v) | ||
| s = string(raw) | ||
| case reflect.Struct: | ||
| if reflect.ValueOf(v).IsZero() { | ||
| break | ||
| } | ||
| if stringer, ok := v.(fmt.Stringer); ok && !hasJSONTags(v, rv.Kind() == reflect.Pointer) { | ||
| s = stringer.String() | ||
| break | ||
| } | ||
| raw, _ := json.Marshal(v) | ||
| s = string(raw) | ||
| case reflect.Invalid: | ||
| return "" | ||
| default: | ||
| s = fmt.Sprint(ft.Interface()) | ||
| } | ||
| s = limitString(s, 100) | ||
| s = strings.TrimSpace(s) | ||
| s = newLineReplacer.Replace(s) | ||
| return s | ||
| } | ||
|
|
||
| func hasJSONTags(v interface{}, isPointer bool) bool { | ||
| t := reflect.TypeOf(v) | ||
| if isPointer { | ||
| t = t.Elem() | ||
| } | ||
| for i := 0; i < t.NumField(); i++ { | ||
| field := t.Field(i) | ||
| if _, hasTag := field.Tag.Lookup("json"); hasTag { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| func limitString(s string, limit int) string { | ||
| if len(s) > limit { | ||
| return s[:limit] + "..." | ||
| } | ||
| return s | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package internal | ||
|
|
||
| import "reflect" | ||
|
|
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| const RequiredErrorMessage = "property is required but was empty" | ||
|
|
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| const RequiredErrorCodeString = "required" | ||
|
|
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| // IsEmptyFunc verifies if the value is zero value of its type. | ||
| func IsEmptyFunc(v interface{}) bool { | ||
| rv := reflect.ValueOf(v) | ||
| return rv.Kind() == 0 || rv.IsZero() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| // Package validation implements a functional API for consistent struct level validation. | ||
| package validation | ||
| // package govy implements a functional API for consistent struct level validation. | ||
| package govy |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,9 @@ | ||
| package govy | ||
|
|
||
| // ErrorCode is a unique string that represents a specific [RuleError]. | ||
| // It can be used to precisely identify the error without inspecting its message. | ||
| type ErrorCode = string | ||
|
|
||
| const ( | ||
| ErrorCodeTransform ErrorCode = "transform" | ||
| ) |
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