1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Portions Copyright The Go Authors.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package internal
import (
"encoding/json"
"path/filepath"
"reflect"
"runtime"
"strings"
"github.com/spf13/hugo/deps"
)
var TemplateFuncsNamespaceRegistry []func(d *deps.Deps) *TemplateFuncsNamespace
func AddTemplateFuncsNamespace(ns func(d *deps.Deps) *TemplateFuncsNamespace) {
TemplateFuncsNamespaceRegistry = append(TemplateFuncsNamespaceRegistry, ns)
}
type TemplateFuncsNamespace struct {
// The namespace name, "strings", "lang", etc.
Name string
// This is the method receiver.
Context interface{}
// Additional info, aliases and examples, per method name.
MethodMappings map[string]TemplateFuncMethodMapping
}
func (t *TemplateFuncsNamespace) AddMethodMapping(m interface{}, aliases []string, examples [][2]string) {
if t.MethodMappings == nil {
t.MethodMappings = make(map[string]TemplateFuncMethodMapping)
}
name := methodToName(m)
// sanity check
for _, e := range examples {
if e[0] == "" {
panic(t.Name + ": Empty example for " + name)
}
}
for _, a := range aliases {
if a == "" {
panic(t.Name + ": Empty alias for " + name)
}
}
t.MethodMappings[name] = TemplateFuncMethodMapping{
Method: m,
Aliases: aliases,
Examples: examples,
}
}
type TemplateFuncMethodMapping struct {
Method interface{}
// Any template funcs aliases. This is mainly motivated by keeping
// backwards compability, but some new template funcs may also make
// sense to give short and snappy aliases.
// Note that these aliases are global and will be merged, so the last
// key will win.
Aliases []string
// A slice of input/expected examples.
// We keep it a the namespace level for now, but may find a way to keep track
// of the single template func, for documentation purposes.
// Some of these, hopefully just a few, may depend on some test data to run.
Examples [][2]string
}
func methodToName(m interface{}) string {
name := runtime.FuncForPC(reflect.ValueOf(m).Pointer()).Name()
name = filepath.Ext(name)
name = strings.TrimPrefix(name, ".")
name = strings.TrimSuffix(name, "-fm")
return name
}
func (t *TemplateFuncsNamespace) MarshalJSON() ([]byte, error) {
type Func struct {
Name string
Description string // TODO(bep)
Aliases []string
Examples [][2]string
}
// TODO(bep) map/lookup from docs template Namespace + Func name.
var funcs []Func
ctx := t.Context.(func() interface{})()
ctxType := reflect.TypeOf(ctx)
for i := 0; i < ctxType.NumMethod(); i++ {
method := ctxType.Method(i)
f := Func{
Name: method.Name,
}
if mapping, ok := t.MethodMappings[method.Name]; ok {
f.Aliases = mapping.Aliases
f.Examples = mapping.Examples
}
funcs = append(funcs, f)
}
return json.Marshal(&struct {
Name string
Funcs []Func
}{
Name: t.Name,
Funcs: funcs,
})
}
|
