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// Copyright 2024 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 hugocontext
import (
"bytes"
"fmt"
"strconv"
"github.com/gohugoio/hugo/bufferpool"
"github.com/gohugoio/hugo/markup/goldmark/internal/render"
"github.com/yuin/goldmark"
"github.com/yuin/goldmark/ast"
"github.com/yuin/goldmark/parser"
"github.com/yuin/goldmark/renderer"
"github.com/yuin/goldmark/text"
"github.com/yuin/goldmark/util"
)
func New() goldmark.Extender {
return &hugoContextExtension{}
}
// Wrap wraps the given byte slice in a Hugo context that used to determine the correct Page
// in .RenderShortcodes.
func Wrap(b []byte, pid uint64) []byte {
buf := bufferpool.GetBuffer()
defer bufferpool.PutBuffer(buf)
buf.Write(prefix)
buf.WriteString(" pid=")
buf.WriteString(strconv.FormatUint(pid, 10))
buf.Write(endDelim)
buf.WriteByte('\n')
buf.Write(b)
buf.Write(prefix)
buf.Write(closingDelimAndNewline)
return buf.Bytes()
}
var kindHugoContext = ast.NewNodeKind("HugoContext")
// HugoContext is a node that represents a Hugo context.
type HugoContext struct {
ast.BaseInline
Closing bool
// Internal page ID. Not persisted.
Pid uint64
}
// Dump implements Node.Dump.
func (n *HugoContext) Dump(source []byte, level int) {
m := map[string]string{}
m["Pid"] = fmt.Sprintf("%v", n.Pid)
ast.DumpHelper(n, source, level, m, nil)
}
func (n *HugoContext) parseAttrs(attrBytes []byte) {
keyPairs := bytes.Split(attrBytes, []byte(" "))
for _, keyPair := range keyPairs {
kv := bytes.Split(keyPair, []byte("="))
if len(kv) != 2 {
continue
}
key := string(kv[0])
val := string(kv[1])
switch key {
case "pid":
pid, _ := strconv.ParseUint(val, 10, 64)
n.Pid = pid
}
}
}
func (h *HugoContext) Kind() ast.NodeKind {
return kindHugoContext
}
var (
prefix = []byte("{{__hugo_ctx")
endDelim = []byte("}}")
closingDelimAndNewline = []byte("/}}\n")
)
var _ parser.InlineParser = (*hugoContextParser)(nil)
type hugoContextParser struct{}
func (s *hugoContextParser) Parse(parent ast.Node, block text.Reader, pc parser.Context) ast.Node {
line, _ := block.PeekLine()
if !bytes.HasPrefix(line, prefix) {
return nil
}
end := bytes.Index(line, endDelim)
if end == -1 {
return nil
}
block.Advance(end + len(endDelim) + 1) // +1 for the newline
if line[end-1] == '/' {
return &HugoContext{Closing: true}
}
attrBytes := line[len(prefix)+1 : end]
h := &HugoContext{}
h.parseAttrs(attrBytes)
return h
}
func (a *hugoContextParser) Trigger() []byte {
return []byte{'{'}
}
type hugoContextRenderer struct{}
func (r *hugoContextRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
reg.Register(kindHugoContext, r.handleHugoContext)
}
func (r *hugoContextRenderer) handleHugoContext(w util.BufWriter, source []byte, node ast.Node, entering bool) (ast.WalkStatus, error) {
if !entering {
return ast.WalkContinue, nil
}
hctx := node.(*HugoContext)
ctx, ok := w.(*render.Context)
if !ok {
return ast.WalkContinue, nil
}
if hctx.Closing {
_ = ctx.PopPid()
} else {
ctx.PushPid(hctx.Pid)
}
return ast.WalkContinue, nil
}
type hugoContextExtension struct{}
func (a *hugoContextExtension) Extend(m goldmark.Markdown) {
m.Parser().AddOptions(
parser.WithInlineParsers(
util.Prioritized(&hugoContextParser{}, 50),
),
)
m.Renderer().AddOptions(
renderer.WithNodeRenderers(
util.Prioritized(&hugoContextRenderer{}, 50),
),
)
}
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