Created Section interface

parser/accessors.go

@@ -0,0 +1,37 @@
+package parser
+
+// Kind returns the section's kind (SectionKindType).
+func (section TypeSection) Kind () (kind SectionKind) {
+	kind = SectionKindType
+	return
+}
+
+// Kind returns the section's kind (SectionKindObjt).
+func (section ObjtSection) Kind () (kind SectionKind) {
+	kind = SectionKindObjt
+	return
+}
+
+// Kind returns the section's kind (SectionKindEnum).
+func (section EnumSection) Kind () (kind SectionKind) {
+	kind = SectionKindEnum
+	return
+}
+
+// Kind returns the section's kind (SectionKindFace).
+func (section FaceSection) Kind () (kind SectionKind) {
+	kind = SectionKindFace
+	return
+}
+
+// Kind returns the section's kind (SectionKindData).
+func (section DataSection) Kind () (kind SectionKind) {
+	kind = SectionKindData
+	return
+}
+
+// Kind returns the section's kind (SectionKindFunc).
+func (section FuncSection) Kind () (kind SectionKind) {
+	kind = SectionKindFunc
+	return
+}

parser/body.go

@@ -3,6 +3,8 @@ package parser
 import "git.tebibyte.media/arf/arf/lexer"
 import "git.tebibyte.media/arf/arf/infoerr"
 
+// TODO: parser must ensure that these names are unique
+
 // parse body parses the body of an arf file, after the metadata header.
 func (parser *ParsingOperation) parseBody () (err error) {
 	for {

parser/tree.go

@@ -18,6 +18,24 @@ type SyntaxTree struct {
 	funcSections map[string] *FuncSection
 }
 
+// SectionKind differentiates Section interfaces.
+type SectionKind int
+
+const (
+	SectionKindType = iota
+	SectionKindObjt
+	SectionKindEnum
+	SectionKindFace
+	SectionKindData
+	SectionKindFunc
+)
+
+// Section can be any kind of section. You can find out what type of section it
+// is with the Kind method.
+type Section interface {
+	Kind () (kind SectionKind)
+}
+
 // Identifier represents a chain of arguments separated by a dot.
 type Identifier struct {
 	locatable