Restructure directory layout: org subpackage

org/footnote.go

@@ -0,0 +1,38 @@
+package org
+
+import (
+	"regexp"
+)
+
+type Footnotes struct {
+	ExcludeHeading bool
+	Title          string
+	Definitions    map[string]FootnoteDefinition
+	Order          []string
+}
+
+type FootnoteDefinition struct {
+	Name     string
+	Children []Node
+}
+
+var footnoteDefinitionRegexp = regexp.MustCompile(`^\[fn:([\w-]+)\]\s+(.+)`)
+
+func lexFootnoteDefinition(line string) (token, bool) {
+	if m := footnoteDefinitionRegexp.FindStringSubmatch(line); m != nil {
+		return token{"footnoteDefinition", 0, m[1], m}, true
+	}
+	return nilToken, false
+}
+
+func (d *Document) parseFootnoteDefinition(i int, parentStop stopFn) (int, Node) {
+	name := d.tokens[i].content
+	d.tokens[i] = tokenize(d.tokens[i].matches[2])
+	stop := func(d *Document, i int) bool {
+		return parentStop(d, i) || isSecondBlankLine(d, i) ||
+			d.tokens[i].kind == "headline" || d.tokens[i].kind == "footnoteDefinition"
+	}
+	consumed, nodes := d.parseMany(i, stop)
+	d.Footnotes.Definitions[name] = FootnoteDefinition{name, nodes}
+	return consumed, nil
+}