ref: 48dbb593f7cc0dceb55d232ac198e82f3df1c964
dir: /hugolib/shortcode.go/
// Copyright 2019 The Hugo Authors. All rights reserved.
//
// 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 hugolib
import (
"bytes"
"fmt"
"strconv"
"github.com/gohugoio/hugo/helpers"
"html/template"
"path"
"github.com/gohugoio/hugo/common/herrors"
"github.com/pkg/errors"
"reflect"
"regexp"
"sort"
"github.com/gohugoio/hugo/parser/pageparser"
"github.com/gohugoio/hugo/resources/page"
_errors "github.com/pkg/errors"
"strings"
"sync"
"github.com/gohugoio/hugo/common/maps"
"github.com/gohugoio/hugo/common/text"
"github.com/gohugoio/hugo/common/urls"
"github.com/gohugoio/hugo/output"
bp "github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/tpl"
)
var (
_ urls.RefLinker = (*ShortcodeWithPage)(nil)
_ pageWrapper = (*ShortcodeWithPage)(nil)
_ text.Positioner = (*ShortcodeWithPage)(nil)
)
// ShortcodeWithPage is the "." context in a shortcode template.
type ShortcodeWithPage struct {
Params interface{}
Inner template.HTML
Page page.Page
Parent *ShortcodeWithPage
Name string
IsNamedParams bool
// Zero-based ordinal in relation to its parent. If the parent is the page itself,
// this ordinal will represent the position of this shortcode in the page content.
Ordinal int
// pos is the position in bytes in the source file. Used for error logging.
posInit sync.Once
posOffset int
pos text.Position
scratch *maps.Scratch
}
// Position returns this shortcode's detailed position. Note that this information
// may be expensive to calculate, so only use this in error situations.
func (scp *ShortcodeWithPage) Position() text.Position {
scp.posInit.Do(func() {
if p, ok := mustUnwrapPage(scp.Page).(pageContext); ok {
scp.pos = p.posOffset(scp.posOffset)
}
})
return scp.pos
}
// Site returns information about the current site.
func (scp *ShortcodeWithPage) Site() page.Site {
return scp.Page.Site()
}
// Ref is a shortcut to the Ref method on Page. It passes itself as a context
// to get better error messages.
func (scp *ShortcodeWithPage) Ref(args map[string]interface{}) (string, error) {
return scp.Page.RefFrom(args, scp)
}
// RelRef is a shortcut to the RelRef method on Page. It passes itself as a context
// to get better error messages.
func (scp *ShortcodeWithPage) RelRef(args map[string]interface{}) (string, error) {
return scp.Page.RelRefFrom(args, scp)
}
// Scratch returns a scratch-pad scoped for this shortcode. This can be used
// as a temporary storage for variables, counters etc.
func (scp *ShortcodeWithPage) Scratch() *maps.Scratch {
if scp.scratch == nil {
scp.scratch = maps.NewScratch()
}
return scp.scratch
}
// Get is a convenience method to look up shortcode parameters by its key.
func (scp *ShortcodeWithPage) Get(key interface{}) interface{} {
if scp.Params == nil {
return nil
}
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 {
// We treat this as a non error, so people can do similar to
// {{ $myParam := .Get "myParam" | default .Get 0 }}
// Without having to do additional checks.
return nil
} else if reflect.TypeOf(scp.Params).Kind() == reflect.Slice {
idx := int(reflect.ValueOf(key).Int())
ln := reflect.ValueOf(scp.Params).Len()
if idx > ln-1 {
return ""
}
x = reflect.ValueOf(scp.Params).Index(idx)
}
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 {
// We treat this as a non error, so people can do similar to
// {{ $myParam := .Get "myParam" | default .Get 0 }}
// Without having to do additional checks.
return nil
}
}
return x.Interface()
}
func (scp *ShortcodeWithPage) page() page.Page {
return scp.Page
}
// Note - this value must not contain any markup syntax
const shortcodePlaceholderPrefix = "HAHAHUGOSHORTCODE"
func createShortcodePlaceholder(id string, ordinal int) string {
return shortcodePlaceholderPrefix + "-" + id + strconv.Itoa(ordinal) + "-HBHB"
}
type shortcode struct {
name string
isInline bool // inline shortcode. Any inner will be a Go template.
isClosing bool // whether a closing tag was provided
inner []interface{} // string or nested shortcode
params interface{} // map or array
ordinal int
err error
info tpl.Info
// If set, the rendered shortcode is sent as part of the surrounding content
// to Blackfriday and similar.
// Before Hug0 0.55 we didn't send any shortcode output to the markup
// renderer, and this flag told Hugo to process the {{ .Inner }} content
// separately.
// The old behaviour can be had by starting your shortcode template with:
// {{ $_hugo_config := `{ "version": 1 }`}}
doMarkup bool
// the placeholder in the source when passed to Blackfriday etc.
// This also identifies the rendered shortcode.
placeholder string
pos int // the position in bytes in the source file
length int // the length in bytes in the source file
}
func (s shortcode) insertPlaceholder() bool {
return !s.doMarkup || s.configVersion() == 1
}
func (s shortcode) configVersion() int {
if s.info == nil {
// Not set for inline shortcodes.
return 2
}
return s.info.ParseInfo().Config.Version
}
func (s shortcode) innerString() string {
var sb strings.Builder
for _, inner := range s.inner {
sb.WriteString(inner.(string))
}
return sb.String()
}
func (sc shortcode) String() string {
// for testing (mostly), so any change here will break tests!
var params interface{}
switch v := sc.params.(type) {
case map[string]interface{}:
// sort the keys so test assertions won't fail
var keys []string
for k := range v {
keys = append(keys, k)
}
sort.Strings(keys)
var tmp = make(map[string]interface{})
for _, k := range keys {
tmp[k] = v[k]
}
params = tmp
default:
// use it as is
params = sc.params
}
return fmt.Sprintf("%s(%q, %t){%s}", sc.name, params, sc.doMarkup, sc.inner)
}
type shortcodeHandler struct {
p *pageState
s *Site
// Ordered list of shortcodes for a page.
shortcodes []*shortcode
// All the shortcode names in this set.
nameSet map[string]bool
// Configuration
enableInlineShortcodes bool
}
func newShortcodeHandler(p *pageState, s *Site, placeholderFunc func() string) *shortcodeHandler {
sh := &shortcodeHandler{
p: p,
s: s,
enableInlineShortcodes: s.enableInlineShortcodes,
shortcodes: make([]*shortcode, 0, 4),
nameSet: make(map[string]bool),
}
return sh
}
const (
innerNewlineRegexp = "\n"
innerCleanupRegexp = `\A<p>(.*)</p>\n\z`
innerCleanupExpand = "$1"
)
func renderShortcode(
level int,
s *Site,
tplVariants tpl.TemplateVariants,
sc *shortcode,
parent *ShortcodeWithPage,
p *pageState) (string, bool, error) {
var tmpl tpl.Template
// Tracks whether this shortcode or any of its children has template variations
// in other languages or output formats. We are currently only interested in
// the output formats, so we may get some false positives -- we
// should improve on that.
var hasVariants bool
if sc.isInline {
if !p.s.enableInlineShortcodes {
return "", false, nil
}
templName := path.Join("_inline_shortcode", p.File().Path(), sc.name)
if sc.isClosing {
templStr := sc.innerString()
var err error
tmpl, err = s.TextTmpl().Parse(templName, templStr)
if err != nil {
fe := herrors.ToFileError("html", err)
l1, l2 := p.posOffset(sc.pos).LineNumber, fe.Position().LineNumber
fe = herrors.ToFileErrorWithLineNumber(fe, l1+l2-1)
return "", false, p.wrapError(fe)
}
} else {
// Re-use of shortcode defined earlier in the same page.
var found bool
tmpl, found = s.TextTmpl().Lookup(templName)
if !found {
return "", false, _errors.Errorf("no earlier definition of shortcode %q found", sc.name)
}
}
} else {
var found, more bool
tmpl, found, more = s.Tmpl().LookupVariant(sc.name, tplVariants)
if !found {
s.Log.ERROR.Printf("Unable to locate template for shortcode %q in page %q", sc.name, p.File().Path())
return "", false, nil
}
hasVariants = hasVariants || more
}
data := &ShortcodeWithPage{Ordinal: sc.ordinal, posOffset: sc.pos, Params: sc.params, Page: newPageForShortcode(p), Parent: parent, Name: sc.name}
if sc.params != nil {
data.IsNamedParams = reflect.TypeOf(sc.params).Kind() == reflect.Map
}
if len(sc.inner) > 0 {
var inner string
for _, innerData := range sc.inner {
switch innerData := innerData.(type) {
case string:
inner += innerData
case *shortcode:
s, more, err := renderShortcode(level+1, s, tplVariants, innerData, data, p)
if err != nil {
return "", false, err
}
hasVariants = hasVariants || more
inner += s
default:
s.Log.ERROR.Printf("Illegal state on shortcode rendering of %q in page %q. Illegal type in inner data: %s ",
sc.name, p.File().Path(), reflect.TypeOf(innerData))
return "", false, nil
}
}
// Pre Hugo 0.55 this was the behaviour even for the outer-most
// shortcode.
if sc.doMarkup && (level > 0 || sc.configVersion() == 1) {
var err error
b, err := p.pageOutput.cp.renderContent([]byte(inner), false)
if err != nil {
return "", false, err
}
newInner := b.Bytes()
// If the type is “” (unknown) or “markdown”, we assume the markdown
// generation has been performed. Given the input: `a line`, markdown
// specifies the HTML `<p>a line</p>\n`. When dealing with documents as a
// whole, this is OK. When dealing with an `{{ .Inner }}` block in Hugo,
// this is not so good. This code does two things:
//
// 1. Check to see if inner has a newline in it. If so, the Inner data is
// unchanged.
// 2 If inner does not have a newline, strip the wrapping <p> block and
// the newline.
switch p.m.markup {
case "", "markdown":
if match, _ := regexp.MatchString(innerNewlineRegexp, inner); !match {
cleaner, err := regexp.Compile(innerCleanupRegexp)
if err == nil {
newInner = cleaner.ReplaceAll(newInner, []byte(innerCleanupExpand))
}
}
}
// TODO(bep) we may have plain text inner templates.
data.Inner = template.HTML(newInner)
} else {
data.Inner = template.HTML(inner)
}
}
result, err := renderShortcodeWithPage(s.Tmpl(), tmpl, data)
if err != nil && sc.isInline {
fe := herrors.ToFileError("html", err)
l1, l2 := p.posFromPage(sc.pos).LineNumber, fe.Position().LineNumber
fe = herrors.ToFileErrorWithLineNumber(fe, l1+l2-1)
return "", false, fe
}
return result, hasVariants, err
}
func (s *shortcodeHandler) hasShortcodes() bool {
return s != nil && len(s.shortcodes) > 0
}
func (s *shortcodeHandler) renderShortcodesForPage(p *pageState, f output.Format) (map[string]string, bool, error) {
rendered := make(map[string]string)
tplVariants := tpl.TemplateVariants{
Language: p.Language().Lang,
OutputFormat: f,
}
var hasVariants bool
for _, v := range s.shortcodes {
s, more, err := renderShortcode(0, s.s, tplVariants, v, nil, p)
if err != nil {
err = p.parseError(_errors.Wrapf(err, "failed to render shortcode %q", v.name), p.source.parsed.Input(), v.pos)
return nil, false, err
}
hasVariants = hasVariants || more
rendered[v.placeholder] = s
}
return rendered, hasVariants, nil
}
var errShortCodeIllegalState = errors.New("Illegal shortcode state")
func (s *shortcodeHandler) parseError(err error, input []byte, pos int) error {
if s.p != nil {
return s.p.parseError(err, input, pos)
}
return err
}
// pageTokens state:
// - before: positioned just before the shortcode start
// - after: shortcode(s) consumed (plural when they are nested)
func (s *shortcodeHandler) extractShortcode(ordinal, level int, pt *pageparser.Iterator) (*shortcode, error) {
if s == nil {
panic("handler nil")
}
sc := &shortcode{ordinal: ordinal}
var cnt = 0
var nestedOrdinal = 0
var nextLevel = level + 1
fail := func(err error, i pageparser.Item) error {
return s.parseError(err, pt.Input(), i.Pos)
}
Loop:
for {
currItem := pt.Next()
switch {
case currItem.IsLeftShortcodeDelim():
next := pt.Peek()
if next.IsShortcodeClose() {
continue
}
if cnt > 0 {
// nested shortcode; append it to inner content
pt.Backup()
nested, err := s.extractShortcode(nestedOrdinal, nextLevel, pt)
nestedOrdinal++
if nested != nil && nested.name != "" {
s.nameSet[nested.name] = true
}
if err == nil {
sc.inner = append(sc.inner, nested)
} else {
return sc, err
}
} else {
sc.doMarkup = currItem.IsShortcodeMarkupDelimiter()
}
cnt++
case currItem.IsRightShortcodeDelim():
// we trust the template on this:
// if there's no inner, we're done
if !sc.isInline {
if sc.info == nil {
// This should not happen.
return sc, fail(errors.New("BUG: template info not set"), currItem)
}
if !sc.info.ParseInfo().IsInner {
return sc, nil
}
}
case currItem.IsShortcodeClose():
next := pt.Peek()
if !sc.isInline {
if sc.info == nil || !sc.info.ParseInfo().IsInner {
if next.IsError() {
// return that error, more specific
continue
}
return sc, fail(_errors.Errorf("shortcode %q has no .Inner, yet a closing tag was provided", next.Val), next)
}
}
if next.IsRightShortcodeDelim() {
// self-closing
pt.Consume(1)
} else {
sc.isClosing = true
pt.Consume(2)
}
return sc, nil
case currItem.IsText():
sc.inner = append(sc.inner, currItem.ValStr())
case currItem.Type == pageparser.TypeEmoji:
// TODO(bep) avoid the duplication of these "text cases", to prevent
// more of #6504 in the future.
val := currItem.ValStr()
if emoji := helpers.Emoji(val); emoji != nil {
sc.inner = append(sc.inner, string(emoji))
} else {
sc.inner = append(sc.inner, val)
}
case currItem.IsShortcodeName():
sc.name = currItem.ValStr()
// Check if the template expects inner content.
// We pick the first template for an arbitrary output format
// if more than one. It is "all inner or no inner".
tmpl, found, _ := s.s.Tmpl().LookupVariant(sc.name, tpl.TemplateVariants{})
if !found {
return nil, _errors.Errorf("template for shortcode %q not found", sc.name)
}
sc.info = tmpl.(tpl.Info)
case currItem.IsInlineShortcodeName():
sc.name = currItem.ValStr()
sc.isInline = true
case currItem.IsShortcodeParam():
if !pt.IsValueNext() {
continue
} else if pt.Peek().IsShortcodeParamVal() {
// named params
if sc.params == nil {
params := make(map[string]interface{})
params[currItem.ValStr()] = pt.Next().ValTyped()
sc.params = params
} else {
if params, ok := sc.params.(map[string]interface{}); ok {
params[currItem.ValStr()] = pt.Next().ValTyped()
} else {
return sc, errShortCodeIllegalState
}
}
} else {
// positional params
if sc.params == nil {
var params []interface{}
params = append(params, currItem.ValTyped())
sc.params = params
} else {
if params, ok := sc.params.([]interface{}); ok {
params = append(params, currItem.ValTyped())
sc.params = params
} else {
return sc, errShortCodeIllegalState
}
}
}
case currItem.IsDone():
// handled by caller
pt.Backup()
break Loop
}
}
return sc, nil
}
// Replace prefixed shortcode tokens with the real content.
// Note: This function will rewrite the input slice.
func replaceShortcodeTokens(source []byte, replacements map[string]string) ([]byte, error) {
if len(replacements) == 0 {
return source, nil
}
start := 0
pre := []byte(shortcodePlaceholderPrefix)
post := []byte("HBHB")
pStart := []byte("<p>")
pEnd := []byte("</p>")
k := bytes.Index(source[start:], pre)
for k != -1 {
j := start + k
postIdx := bytes.Index(source[j:], post)
if postIdx < 0 {
// this should never happen, but let the caller decide to panic or not
return nil, errors.New("illegal state in content; shortcode token missing end delim")
}
end := j + postIdx + 4
newVal := []byte(replacements[string(source[j:end])])
// Issue #1148: Check for wrapping p-tags <p>
if j >= 3 && bytes.Equal(source[j-3:j], pStart) {
if (k+4) < len(source) && bytes.Equal(source[end:end+4], pEnd) {
j -= 3
end += 4
}
}
// This and other cool slice tricks: https://github.com/golang/go/wiki/SliceTricks
source = append(source[:j], append(newVal, source[end:]...)...)
start = j
k = bytes.Index(source[start:], pre)
}
return source, nil
}
func renderShortcodeWithPage(h tpl.TemplateHandler, tmpl tpl.Template, data *ShortcodeWithPage) (string, error) {
buffer := bp.GetBuffer()
defer bp.PutBuffer(buffer)
err := h.Execute(tmpl, buffer, data)
if err != nil {
return "", _errors.Wrap(err, "failed to process shortcode")
}
return buffer.String(), nil
}