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image.go
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image.go
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package parser
import "github.com/usememos/memos/plugin/gomark/parser/tokenizer"
type ImageParser struct {
AltText string
URL string
}
func NewImageParser() *ImageParser {
return &ImageParser{}
}
func (*ImageParser) Match(tokens []*tokenizer.Token) *ImageParser {
if len(tokens) < 5 {
return nil
}
if tokens[0].Type != tokenizer.ExclamationMark {
return nil
}
if tokens[1].Type != tokenizer.LeftSquareBracket {
return nil
}
cursor, altText := 2, ""
for ; cursor < len(tokens)-2; cursor++ {
if tokens[cursor].Type == tokenizer.Newline {
return nil
}
if tokens[cursor].Type == tokenizer.RightSquareBracket {
break
}
altText += tokens[cursor].Value
}
if tokens[cursor+1].Type != tokenizer.LeftParenthesis {
return nil
}
matched, url := false, ""
for _, token := range tokens[cursor+2:] {
if token.Type == tokenizer.Newline || token.Type == tokenizer.Space {
return nil
}
if token.Type == tokenizer.RightParenthesis {
matched = true
break
}
url += token.Value
}
if !matched || url == "" {
return nil
}
return &ImageParser{
AltText: altText,
URL: url,
}
}