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|
package markdown
import (
"errors"
"html/template"
"strings"
"git.anhgelus.world/anhgelus/small-web/dom"
)
var (
ErrInvalidCallout = errors.New("invalid callout")
)
type astCallout struct {
kind string
title *astParagraph
content []*astParagraph
}
func (a *astCallout) Eval(opt *Option) (template.HTML, *ParseError) {
inner := dom.NewContentElement("div", make([]dom.Element, 0))
for _, c := range a.content {
ct, err := c.Eval(opt)
if err != nil {
return "", err
}
inner.Contents = append(inner.Contents, dom.NewParagraph(
template.HTML(strings.TrimSpace(string(ct))),
))
}
titleContent, err := a.title.Eval(opt)
if err != nil {
return "", err
}
titleContent = template.HTML(strings.TrimSpace(string(titleContent)))
if len(titleContent) == 0 {
titleContent = template.HTML(a.kind)
}
title := dom.NewLiteralContentElement("h4", titleContent)
callout := dom.NewContentElement("div", make([]dom.Element, 0))
callout.Contents = append(callout.Contents, title)
if len(inner.Contents) > 0 {
callout.Contents = append(callout.Contents, inner)
}
callout.SetAttribute("data-kind", a.kind)
callout.ClassList().Add("callout")
return callout.Render(), nil
}
func callout(lxs *lexers) (block, *ParseError) {
callout := new(astCallout)
if lxs.Current().Value != "[!" {
return paragraph(lxs, false)
}
if !lxs.Next() {
return nil, &ParseError{lxs: *lxs, internal: ErrInvalidCallout}
}
callout.kind = strings.ToLower(lxs.Current().Value)
if !lxs.Next() || lxs.Current().Type != lexerCallout || lxs.Current().Value != "]" {
return nil, &ParseError{lxs: *lxs, internal: ErrInvalidCallout}
}
var err *ParseError
callout.title, err = paragraph(lxs, true)
if err != nil {
return nil, err
}
n := 0
for lxs.Next() && n < 2 {
current := lxs.Current()
n = 0
switch current.Type {
case lexerBreak:
n = len(current.Value)
case lexerQuote:
case lexerLiteral, lexerModifier, lexerCode, lexerExternal:
p, err := paragraph(lxs, true)
if err != nil {
return nil, err
}
lxs.Before()
callout.content = append(callout.content, p)
n++
default:
// because the code did not use it
lxs.Before()
return callout, nil
}
}
lxs.Before()
return callout, nil
}
|
