github.com/linchen2chris/hugo@v0.0.0-20230307053224-cec209389705/resources/resource/params.go (about)

     1  // Copyright 2019 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 resource
    15  
    16  import (
    17  	"github.com/gohugoio/hugo/common/maps"
    18  
    19  	"github.com/spf13/cast"
    20  )
    21  
    22  func Param(r ResourceParamsProvider, fallback maps.Params, key any) (any, error) {
    23  	keyStr, err := cast.ToStringE(key)
    24  	if err != nil {
    25  		return nil, err
    26  	}
    27  
    28  	if fallback == nil {
    29  		return maps.GetNestedParam(keyStr, ".", r.Params())
    30  	}
    31  
    32  	return maps.GetNestedParam(keyStr, ".", r.Params(), fallback)
    33  }