1 files changed, 33 insertions, 0 deletions
diff --git a/document_attribute.go b/document_attribute.go
new file mode 100644
index 0000000..c7b2c83
--- /dev/null
+++ b/document_attribute.go
@@ -0,0 +1,33 @@
+// SPDX-FileCopyrightText: 2020 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package asciidoctor
+
+import "strings"
+
+// DocumentAttribute contains the mapping of global attribute keys in the
+// headers with its value.
+type DocumentAttribute map[string]string
+
+func newDocumentAttribute() DocumentAttribute {
+	return DocumentAttribute{
+		MetaNameGenerator:       `asciidoctor-go ` + Version,
+		metaNameLastUpdateLabel: `Last updated`,
+		metaNameLastUpdateValue: ``,
+		metaNameSectIDs:         ``,
+		metaNameShowTitle:       ``,
+		metaNameTableCaption:    ``,
+		metaNameVersionLabel:    ``,
+	}
+}
+
+func (entry *DocumentAttribute) apply(key, val string) {
+	switch {
+	case key[0] == '!':
+		delete(*entry, strings.TrimSpace(key[1:]))
+	case key[len(key)-1] == '!':
+		delete(*entry, strings.TrimSpace(key[:len(key)-1]))
+	default:
+		(*entry)[key] = val
+	}
+}