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package markdown
import (
"errors"
"fmt"
"html/template"
)
var ErrInvalidHeader = errors.New("invalid header")
type astHeader struct {
level uint
content *astParagraph
}
func (a *astHeader) Eval(opt *Option) (template.HTML, *ParseError) {
if a.level > 6 {
return "", &ParseError{lxs: lexers{}, internal: ErrInvalidCodeFormat}
}
var content template.HTML
content, err := a.content.Eval(opt)
if err != nil {
return "", err
}
return template.HTML(fmt.Sprintf("<h%d>%s</h%d>", a.level, trimSpace(content), a.level)), nil
}
func header(lxs *lexers) (*astHeader, *ParseError) {
b := &astHeader{level: uint(len(lxs.Current().Value))}
if !lxs.Next() {
return nil, &ParseError{lxs: *lxs, internal: ErrInvalidHeader}
}
var err *ParseError
b.content, err = paragraph(lxs, true)
if err != nil {
return nil, err
}
return b, nil
}
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