parser/meta/meta.go

@@ -4,6 +4,7 @@ import "io"
 import "fmt"
 import "github.com/google/uuid"
 import "git.tebibyte.media/sashakoshka/fspl/lexer"
+import "git.tebibyte.media/sashakoshka/fspl/errors"
 import "git.tebibyte.media/sashakoshka/fspl/parser"
 import "git.tebibyte.media/sashakoshka/fspl/entity"
 
@@ -31,6 +32,7 @@ func (this *Tree) Parse (lx lexer.Lexer) error {
 	return parser.parseInto(this)
 }
 
+// AddDirective adds a metadata directive to the tree.
 func (this *Tree) AddDirective (directive entity.Directive) {
 	switch directive := directive.(type) {
 	case *entity.Dependency:
@@ -65,6 +67,68 @@ func (this *treeParser) parse () error {
 	err := this.Next()
 	if err != nil { return err }
 
-	// TODO
+	// String: UUID
+	err = this.Expect(lexer.String)
+	if err != nil { return err }
+	id, err := uuid.Parse(this.Value())
+	if err != nil {
+		return errors.Errorf(this.Pos(), "%v", err.Error())
+	}
+	this.tree.UUID = id
+	this.Next()
+
+	// parse directives
+	for !this.EOF() {
+		err := this.parseDirective()
+		if err != nil { return err }
+	}
+	
 	return nil
 }
+
+func (this *treeParser) bug () string {
+	return fmt.Sprintln (
+		"Bug detected in the compiler!\n" +
+		"The metadata parser has taken an unexpected control path.",
+		"This could be due to an un-implemented feature.\n" +
+		"Please submit a report with this info and stack trace to:",
+		"https://git.tebibyte.media/sashakoshka/fspl/issues\n" +
+		"The token being parsed was:", this.Token)
+}
+
+func (this *treeParser) parseDirective () error {
+	err := this.ExpectValueDesc("directive", lexer.Symbol, "+")
+	if err != nil { return err }
+
+	var directive entity.Directive
+	switch this.Value() {
+	case "+":
+		// Symbol "+": Dependency
+		directive, err = this.parseDependency()
+		if err != nil { return err }
+	default: panic(this.bug())
+	}
+	this.tree.AddDirective(directive)
+	return nil
+}
+
+func (this *treeParser) parseDependency () (*entity.Dependency, error) {
+	err := this.ExpectValueDesc("dependency", lexer.Symbol, "+")
+	if err != nil { return nil, err }
+
+	err = this.ExpectNextDesc("address", lexer.String)
+	if err != nil { return nil, err }
+	dependency := &entity.Dependency {
+		Position: this.Pos(),
+		Address:  entity.Address(this.Value()),
+	}
+
+	this.Next()
+	if this.Is(lexer.Ident) {
+		// Ident: Nickname
+		dependency.Nickname = this.Value()
+		this.Next()
+	}
+
+	return dependency, nil
+}