mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-07 20:30:36 -05:00
110 lines
2.6 KiB
Go
110 lines
2.6 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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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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//
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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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package types
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import (
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"encoding/json"
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"fmt"
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"html/template"
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"reflect"
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"github.com/spf13/cast"
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)
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// ToStringSlicePreserveString is the same as ToStringSlicePreserveStringE,
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// but it never fails.
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func ToStringSlicePreserveString(v interface{}) []string {
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vv, _ := ToStringSlicePreserveStringE(v)
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return vv
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}
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// ToStringSlicePreserveStringE converts v to a string slice.
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// If v is a string, it will be wrapped in a string slice.
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func ToStringSlicePreserveStringE(v interface{}) ([]string, error) {
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if v == nil {
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return nil, nil
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}
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if sds, ok := v.(string); ok {
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return []string{sds}, nil
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}
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result, err := cast.ToStringSliceE(v)
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if err == nil {
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return result, nil
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}
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// Probably []int or similar. Fall back to reflect.
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vv := reflect.ValueOf(v)
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switch vv.Kind() {
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case reflect.Slice, reflect.Array:
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result = make([]string, vv.Len())
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for i := 0; i < vv.Len(); i++ {
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s, err := cast.ToStringE(vv.Index(i).Interface())
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if err != nil {
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return nil, err
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}
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result[i] = s
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}
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return result, nil
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default:
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return nil, fmt.Errorf("failed to convert %T to a string slice", v)
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}
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}
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// TypeToString converts v to a string if it's a valid string type.
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// Note that this will not try to convert numeric values etc.,
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// use ToString for that.
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func TypeToString(v interface{}) (string, bool) {
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switch s := v.(type) {
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case string:
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return s, true
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case template.HTML:
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return string(s), true
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case template.CSS:
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return string(s), true
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case template.HTMLAttr:
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return string(s), true
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case template.JS:
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return string(s), true
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case template.JSStr:
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return string(s), true
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case template.URL:
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return string(s), true
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case template.Srcset:
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return string(s), true
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}
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return "", false
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}
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// ToString converts v to a string.
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func ToString(v interface{}) string {
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s, _ := ToStringE(v)
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return s
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}
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// ToStringE converts v to a string.
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func ToStringE(v interface{}) (string, error) {
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if s, ok := TypeToString(v); ok {
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return s, nil
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}
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switch s := v.(type) {
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case json.RawMessage:
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return string(s), nil
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default:
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return cast.ToStringE(v)
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}
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}
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