github.com/whatlly/hugo@v0.47.1/tpl/cast/cast.go (about)

     1  // Copyright 2017 The Hugo Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package cast
    15  
    16  import (
    17  	"html/template"
    18  
    19  	_cast "github.com/spf13/cast"
    20  )
    21  
    22  // New returns a new instance of the cast-namespaced template functions.
    23  func New() *Namespace {
    24  	return &Namespace{}
    25  }
    26  
    27  // Namespace provides template functions for the "cast" namespace.
    28  type Namespace struct {
    29  }
    30  
    31  // ToInt converts the given value to an int.
    32  func (ns *Namespace) ToInt(v interface{}) (int, error) {
    33  	v = convertTemplateToString(v)
    34  	return _cast.ToIntE(v)
    35  }
    36  
    37  // ToString converts the given value to a string.
    38  func (ns *Namespace) ToString(v interface{}) (string, error) {
    39  	return _cast.ToStringE(v)
    40  }
    41  
    42  // ToFloat converts the given value to a float.
    43  func (ns *Namespace) ToFloat(v interface{}) (float64, error) {
    44  	v = convertTemplateToString(v)
    45  	return _cast.ToFloat64E(v)
    46  }
    47  
    48  func convertTemplateToString(v interface{}) interface{} {
    49  	switch vv := v.(type) {
    50  	case template.HTML:
    51  		v = string(vv)
    52  	case template.CSS:
    53  		v = string(vv)
    54  	case template.HTMLAttr:
    55  		v = string(vv)
    56  	case template.JS:
    57  		v = string(vv)
    58  	case template.JSStr:
    59  		v = string(vv)
    60  	}
    61  	return v
    62  }