Method parseRelationTypeStatement

pkg/dsl/parser/parser.go:497–522

parseRelationTypeStatement method parses a single relation type within a RELATION statement and returns a RelationTypeStatement AST node

()

// parseRelationTypeStatement method parses a single relation type within a RELATION statement and returns a RelationTypeStatement AST node
func (p *Parser) parseRelationTypeStatement() (*ast.RelationTypeStatement, error) {
	// expect the currentToken to be a SIGN token, indicating the start of the relation type
	if !p.expectAndNext(token.SIGN) {
		return nil, p.Error()
	}
	// create a new RelationTypeStatement object and set its Sign field to the SIGN token
	stmt := &ast.RelationTypeStatement{Sign: p.currentToken}

	// expect the next token to be an identifier token, and set the RelationTypeStatement's Type field to the identifier's value
	if !p.expectAndNext(token.IDENT) {
		return nil, p.Error()
	}
	stmt.Type = p.currentToken

	// if the next token is a HASH token, indicating that a specific relation within the relation type is being referenced, parse it and set the RelationTypeStatement's Relation field to the identifier's value
	if p.peekTokenIs(token.HASH) {
		p.next()
		if !p.expectAndNext(token.IDENT) {
			return nil, p.Error()
		}
		stmt.Relation = p.currentToken
	}

	// return the parsed RelationTypeStatement and nil for the error value
	return stmt, nil
}

// parsePermissionStatement method parses an PERMISSION statement and returns an PermissionStatement AST node
func (p *Parser) parsePermissionStatement(entityName string) (ast.Statement, error) {