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|
package mardown
import (
"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"
codeTag modifierTag = "code"
)
type astModifier struct {
symbols string
tag modifierTag
content []block
parent *astModifier
}
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 modifier(lxs *lexers) (*astModifier, error) {
current := lxs.Current().Value
mod := modifierDetect(current)
modInside := mod
if len(mod.content) > 0 {
var ok bool
modInside, ok = mod.content[0].(*astModifier)
if modInside.content != nil && !ok {
return nil, ErrInternalError
}
// getting the last modifier
for len(modInside.content) > 0 {
modInside, ok = modInside.content[0].(*astModifier)
if modInside.content != nil && !ok {
return nil, ErrInternalError
}
}
}
n := len(modInside.symbols)
var s string
for lxs.Next() {
switch lxs.Current().Type {
case lexerLiteral:
s += lxs.Current().Value
case lexerModifier:
if len(lxs.Current().Value) < n {
return nil, ErrInvalidModifier
}
if lxs.Current().Value[:n] != modInside.symbols {
return nil, ErrInvalidModifier
}
modInside.content = append(modInside.content, astLiteral(s))
s = ""
modInside = modInside.parent
default:
return nil, ErrInvalidTypeInModifier
}
}
return mod, nil
}
func modifierDetect(val string) *astModifier {
mod := new(astModifier)
if len(val) == 1 {
mod.symbols = val
if val == "`" {
mod.tag = codeTag
} else {
mod.tag = emTag
}
return mod
}
if val[:2] == "**" || val[:2] == "__" {
mod.symbols = val
mod.tag = boldTag
} else {
mod = modifierDetect(val[:1])
next := modifierDetect(val[1:])
next.parent = mod
mod.content = append(mod.content, next)
}
return mod
}
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