ref: 4281cbfa34f879954c021dd81616daf0879bc7a7
dir: /hugolib/shortcode.go/
// Copyright © 2013 Steve Francia <[email protected]>.
//
// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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 hugolib
import (
"bytes"
"html/template"
"reflect"
"strings"
"unicode"
jww "github.com/spf13/jwalterweatherman"
)
type ShortcodeFunc func([]string) string
type Shortcode struct {
Name string
Func ShortcodeFunc
}
type ShortcodeWithPage struct {
Params interface{}
Inner template.HTML
Page *Page
}
func (scp *ShortcodeWithPage) Get(key interface{}) interface{} {
if reflect.ValueOf(scp.Params).Len() == 0 {
return nil
}
var x reflect.Value
switch key.(type) {
case int64, int32, int16, int8, int:
if reflect.TypeOf(scp.Params).Kind() == reflect.Map {
return "error: cannot access named params by position"
} else if reflect.TypeOf(scp.Params).Kind() == reflect.Slice {
x = reflect.ValueOf(scp.Params).Index(int(reflect.ValueOf(key).Int()))
}
case string:
if reflect.TypeOf(scp.Params).Kind() == reflect.Map {
x = reflect.ValueOf(scp.Params).MapIndex(reflect.ValueOf(key))
if !x.IsValid() {
return ""
}
} else if reflect.TypeOf(scp.Params).Kind() == reflect.Slice {
if reflect.ValueOf(scp.Params).Len() == 1 && reflect.ValueOf(scp.Params).Index(0).String() == "" {
return nil
}
return "error: cannot access positional params by string name"
}
}
switch x.Kind() {
case reflect.String:
return x.String()
case reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8, reflect.Int:
return x.Int()
default:
return x
}
}
type Shortcodes map[string]ShortcodeFunc
func ShortcodesHandle(stringToParse string, p *Page, t Template) string {
leadStart := strings.Index(stringToParse, `{{%`)
if leadStart >= 0 {
leadEnd := strings.Index(stringToParse[leadStart:], `%}}`) + leadStart
if leadEnd > leadStart {
name, par := SplitParams(stringToParse[leadStart+3 : leadEnd])
tmpl := GetTemplate(name, t)
if tmpl == nil {
return stringToParse
}
params := Tokenize(par)
// Always look for closing tag.
endStart, endEnd := FindEnd(stringToParse[leadEnd:], name)
var data = &ShortcodeWithPage{Params: params, Page: p}
if endStart > 0 {
s := stringToParse[leadEnd+3 : leadEnd+endStart]
data.Inner = template.HTML(CleanP(ShortcodesHandle(s, p, t)))
remainder := CleanP(stringToParse[leadEnd+endEnd:])
return CleanP(stringToParse[:leadStart]) +
ShortcodeRender(tmpl, data) +
CleanP(ShortcodesHandle(remainder, p, t))
}
return CleanP(stringToParse[:leadStart]) +
ShortcodeRender(tmpl, data) +
CleanP(ShortcodesHandle(stringToParse[leadEnd+3:], p,
t))
}
}
return stringToParse
}
// Clean up odd behavior when closing tag is on first line
// or opening tag is on the last line due to extra line in markdown file
func CleanP(str string) string {
if strings.HasSuffix(strings.TrimSpace(str), "<p>") {
idx := strings.LastIndex(str, "<p>")
str = str[:idx]
}
if strings.HasPrefix(strings.TrimSpace(str), "</p>") {
str = str[strings.Index(str, "</p>")+5:]
}
return str
}
func FindEnd(str string, name string) (int, int) {
var endPos int
var startPos int
var try []string
try = append(try, "{{% /"+name+" %}}")
try = append(try, "{{% /"+name+"%}}")
try = append(try, "{{%/"+name+"%}}")
try = append(try, "{{%/"+name+" %}}")
lowest := len(str)
for _, x := range try {
start := strings.Index(str, x)
if start < lowest && start > 0 {
startPos = start
endPos = startPos + len(x)
}
}
return startPos, endPos
}
func GetTemplate(name string, t Template) *template.Template {
if x := t.Lookup("shortcodes/" + name + ".html"); x != nil {
return x
}
if x := t.Lookup("theme/shortcodes/" + name + ".html"); x != nil {
return x
}
return t.Lookup("_internal/shortcodes/" + name + ".html")
}
func StripShortcodes(stringToParse string) string {
posStart := strings.Index(stringToParse, "{{%")
if posStart > 0 {
posEnd := strings.Index(stringToParse[posStart:], "%}}") + posStart
if posEnd > posStart {
newString := stringToParse[:posStart] + StripShortcodes(stringToParse[posEnd+3:])
return newString
}
}
return stringToParse
}
func CleanupSpacesAroundEquals(rawfirst []string) []string {
var first = make([]string, 0)
for i := 0; i < len(rawfirst); i++ {
v := rawfirst[i]
index := strings.Index(v, "=")
if index == len(v)-1 {
// Trailing '='
if len(rawfirst) > i {
if v == "=" {
first[len(first)-1] = first[len(first)-1] + v + rawfirst[i+1] // concat prior with this and next
i++ // Skip next
} else {
// Trailing ' = '
first = append(first, v+rawfirst[i+1]) // append this token and the next
i++ // Skip next
}
} else {
break
}
} else if index == 0 {
// Leading '='
first[len(first)-1] = first[len(first)-1] + v // concat this token to the prior one
continue
} else {
first = append(first, v)
}
}
return first
}
func Tokenize(in string) interface{} {
var final = make([]string, 0)
// if there isn't a space or an equal sign, no need to parse
if strings.Index(in, " ") < 0 && strings.Index(in, "=") < 0 {
return append(final, in)
}
var keys = make([]string, 0)
inQuote := false
start := 0
first := CleanupSpacesAroundEquals(strings.Fields(in))
for i, v := range first {
index := strings.Index(v, "=")
if !inQuote {
if index > 1 {
keys = append(keys, v[:index])
v = v[index+1:]
}
}
// Adjusted to handle htmlencoded and non htmlencoded input
if !strings.HasPrefix(v, "“") && !strings.HasPrefix(v, "\"") && !inQuote {
final = append(final, v)
} else if inQuote && (strings.HasSuffix(v, "”") ||
strings.HasSuffix(v, "\"")) && !strings.HasSuffix(v, "\\\"") {
if strings.HasSuffix(v, "\"") {
first[i] = v[:len(v)-1]
} else {
first[i] = v[:len(v)-7]
}
final = append(final, strings.Join(first[start:i+1], " "))
inQuote = false
} else if (strings.HasPrefix(v, "“") ||
strings.HasPrefix(v, "\"")) && !inQuote {
if strings.HasSuffix(v, "”") || strings.HasSuffix(v,
"\"") {
if strings.HasSuffix(v, "\"") {
if len(v) > 1 {
final = append(final, v[1:len(v)-1])
} else {
final = append(final, "")
}
} else {
final = append(final, v[7:len(v)-7])
}
} else {
start = i
if strings.HasPrefix(v, "\"") {
first[i] = v[1:]
} else {
first[i] = v[7:]
}
inQuote = true
}
}
// No closing "... just make remainder the final token
if inQuote && i == len(first) {
final = append(final, first[start:]...)
}
}
if len(keys) > 0 && (len(keys) != len(final)) {
// This will happen if the quotes aren't balanced
return final
}
if len(keys) > 0 {
var m = make(map[string]string)
for i, k := range keys {
m[k] = final[i]
}
return m
}
return final
}
func SplitParams(in string) (name string, par2 string) {
newIn := strings.TrimSpace(in)
i := strings.IndexFunc(newIn, unicode.IsSpace)
if i < 1 {
return strings.TrimSpace(in), ""
}
return strings.TrimSpace(newIn[:i+1]), strings.TrimSpace(newIn[i+1:])
}
func ShortcodeRender(tmpl *template.Template, data *ShortcodeWithPage) string {
buffer := new(bytes.Buffer)
err := tmpl.Execute(buffer, data)
if err != nil {
jww.ERROR.Println("error processing shortcode", tmpl.Name(), "\n ERR:", err)
jww.WARN.Println(data)
}
return buffer.String()
}