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package mardown
import (
"encoding/json"
"errors"
"fmt"
"html/template"
)
var (
ErrInternalError = errors.New("internal error")
ErrInvalidModifier = errors.Join(ErrInvalidParagraph, errors.New("invalid modifier organization"))
ErrInvalidTypeInModifier = errors.Join(ErrInvalidParagraph, errors.New("invalid type in modifier"))
)
type modifierTag string
const (
boldTag modifierTag = "b"
emTag modifierTag = "em"
)
type astModifier struct {
symbols string
tag modifierTag
content []block
}
func (a *astModifier) Eval() (template.HTML, error) {
var content template.HTML
for _, c := range a.content {
ct, err := c.Eval()
if err != nil {
return "", err
}
content += ct
}
return template.HTML(fmt.Sprintf("<%s>%s</%s>", a.tag, content, a.tag)), nil
}
func (a *astModifier) String() string {
content := "["
for _, c := range a.content {
content += "\n\t"
if v, ok := c.(fmt.Stringer); ok {
content += v.String()
} else {
b, _ := json.MarshalIndent(a.content, "\t", " ")
content += string(b)
}
content += ",\n\t"
}
content += "]"
return fmt.Sprintf("modifier{sym: %s, tag: %s, content: %s\n}", a.symbols, a.tag, content)
}
func modifier(lxs *lexers) (*astModifier, error) {
current := lxs.Current().Value
mod, err := modifierDetect(current)
if err != nil {
return nil, err
}
var s string
for lxs.Next() {
switch lxs.Current().Type {
case lexerLiteral, lexerHeader, lexerList:
s += lxs.Current().Value
case lexerModifier:
if lxs.Current().Value == mod.symbols {
mod.content = append(mod.content, astLiteral(s))
return mod, nil
}
if len(s) != 0 {
mod.content = append(mod.content, astLiteral(s))
s = ""
}
c, err := modifier(lxs)
if err != nil {
return nil, err
}
mod.content = append(mod.content, c)
case lexerBreak:
lxs.Before() // because we did not use it
if len(s) != 0 {
return nil, ErrInvalidModifier
}
return mod, nil
case lexerExternal:
if lxs.Current().Value == "!" {
s += lxs.Current().Value
}
default:
return nil, ErrInvalidTypeInModifier
}
}
if len(s) != 0 {
return nil, ErrInvalidModifier
}
return mod, nil
}
func modifierDetect(val string) (*astModifier, error) {
mod := new(astModifier)
switch len(val) {
case 1:
mod.symbols = val
mod.tag = emTag
return mod, nil
case 2:
mod.symbols = val
mod.tag = boldTag
return mod, nil
default:
return nil, ErrInvalidModifier
}
}
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