stof 0.9.19

Data that carries its own logic.
Documentation 
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//
// Copyright 2025 Formata, Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

use serde_json::Value;
use crate::{model::{Format, Graph, NodeRef, Profile, export::json_value_from_node, import::parse_json_object_value}, runtime::Error};


#[derive(Debug)]
pub struct YamlFormat;
impl Format for YamlFormat {
    fn identifiers(&self) -> Vec<String> {
        vec!["yaml".into(), "yml".into()]
    }
    fn content_type(&self) -> String {
        "application/yaml".into()
    }
    fn string_import(&self, graph: &mut Graph, _format: &str, src: &str, node: Option<NodeRef>, _profile: &Profile) -> Result<(), Error> {
        if src.is_empty() { return Ok(()); }
        match serde_yaml::from_str::<Value>(src) {
            Ok(value) => {
                let mut parse_node = graph.ensure_main_root();
                if let Some(nd) = node {
                    parse_node = nd;
                }
                parse_json_object_value(graph, &parse_node, value);
                Ok(())
            },
            Err(error) => {
                Err(Error::YAMLStringImport(error.to_string()))
            }
        }
    }
    fn string_export(&self, graph: &Graph, _format: &str, node: Option<NodeRef>) -> Result<String, Error> {
        let exp_node;
        if let Some(nd) = node {
            exp_node = nd;
        } else {
            exp_node = graph.main_root().expect("graph does not have a main 'root' node for default YAML export");
        }
        let value = json_value_from_node(graph, &exp_node);
        match serde_yaml::to_string(&value) {
            Ok(yaml) => {
                Ok(yaml)
            },
            Err(error) => {
                Err(Error::YAMLStringExport(error.to_string()))
            }
        }
    }
}