1 files changed, 100 insertions, 0 deletions
diff --git a/internal/glightbox/parser.go b/internal/glightbox/parser.go
new file mode 100644
index 0000000..6780090
--- /dev/null
+++ b/internal/glightbox/parser.go
@@ -0,0 +1,100 @@
+package glightbox
+
+import (
+	"bytes"
+	"log/slog"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/text"
+)
+
+type GLightboxParser struct{}
+
+func NewGLightboxParser() parser.BlockParser {
+	return &GLightboxParser{}
+}
+
+func (p *GLightboxParser) Trigger() []byte {
+	return []byte{'{'}
+}
+
+func (p *GLightboxParser) Open(parent ast.Node, reader text.Reader, pc parser.Context) (ast.Node, parser.State) {
+	line, _ := reader.PeekLine()
+
+	if !bytes.HasPrefix(line, []byte("{Gallery:")) {
+		return nil, parser.NoChildren
+	}
+
+	r := regexp.MustCompile(`^\{Gallery:([A-Za-z0-9\+\-/]+)\}$`)
+
+	trimmed := bytes.TrimSpace(line)
+	parts := r.FindSubmatch(trimmed)
+	if len(parts) < 2 {
+		slog.Warn("invalid gallery header format", slog.String("line", string(trimmed)), slog.Int("submatch_count", len(parts)))
+		return nil, parser.NoChildren
+	}
+
+	loc, err := time.LoadLocation(string(parts[1]))
+	if err != nil {
+		slog.Warn("invalid location specified for a gallery", slog.String("error", err.Error()), slog.String("line", string(trimmed)), slog.String("location", string(parts[1])))
+		return nil, parser.NoChildren
+	}
+
+	return &GLightboxBlock{Location: loc}, parser.NoChildren
+}
+
+func (p *GLightboxParser) Continue(node ast.Node, reader text.Reader, pc parser.Context) parser.State {
+	line, segment := reader.PeekLine()
+	if len(line) == 0 || segment.Len() == 0 {
+		return parser.Continue | parser.NoChildren
+	}
+
+	trimmed := bytes.TrimSpace(line)
+	if bytes.Equal(trimmed, []byte("{Gallery}")) || bytes.Equal(trimmed, []byte("{/Gallery}")) {
+		reader.AdvanceLine()
+		return parser.Close
+	}
+
+	gallery := node.(*GLightboxBlock)
+
+	parts := bytes.SplitN(trimmed, []byte{'|'}, 3)
+	url := bytes.TrimSpace(parts[0])
+
+	caption := make([]byte, 0)
+	tagsRaw := ""
+	if len(parts) == 2 {
+		caption = bytes.TrimSpace(parts[1])
+	}
+	if len(parts) >= 3 {
+		tagsRaw = string(parts[1])
+		caption = bytes.TrimSpace(parts[2])
+	}
+
+	tags := strings.Split(tagsRaw, ",")
+	for i := range tags {
+		tags[i] = strings.TrimSpace(tags[i])
+	}
+
+	gallery.Images = append(gallery.Images, GLightboxImage{
+		URL:     string(url),
+		Tags:    tags,
+		Caption: caption,
+	})
+
+	return parser.Continue | parser.NoChildren
+}
+
+func (p *GLightboxParser) Close(node ast.Node, reader text.Reader, pc parser.Context) {
+}
+
+func (p *GLightboxParser) CanInterruptParagraph() bool {
+	return true
+}
+
+func (p *GLightboxParser) CanAcceptIndentedLine() bool {
+	return false
+}