merman-core 0.8.0-alpha.4

Mermaid parser + semantic model (headless; parity-focused).
Documentation 
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use crate::{
    ParseMetadata, Result, common_db,
    diagram::{ParsedDiagram, ParsedDiagramRender, RenderSemanticModel},
};
use serde::{Deserialize, Serialize};
use serde_json::{Value, json};

/// Typed semantic model for Merman's built-in suppressed-error diagram.
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ErrorDiagramRenderModel {
    #[serde(rename = "type")]
    pub diagram_type: String,
}

impl ErrorDiagramRenderModel {
    fn new(meta: &ParseMetadata) -> Self {
        Self {
            diagram_type: meta.diagram_type.clone(),
        }
    }

    fn compatibility_json(&self) -> Value {
        json!({
            "type": self.diagram_type,
        })
    }
}

pub(crate) fn render_model_to_compat_json(
    model: &ErrorDiagramRenderModel,
    _meta: &ParseMetadata,
) -> Result<Value> {
    Ok(model.compatibility_json())
}

pub(crate) fn parse_error(_code: &str, meta: &ParseMetadata) -> Result<Value> {
    render_model_to_compat_json(&ErrorDiagramRenderModel::new(meta), meta)
}

pub(crate) fn parse_error_model_for_render(
    _code: &str,
    meta: &ParseMetadata,
) -> Result<ErrorDiagramRenderModel> {
    Ok(ErrorDiagramRenderModel::new(meta))
}

pub(crate) fn suppressed_error_diagram(source_meta: &ParseMetadata) -> ParsedDiagram {
    let meta = suppressed_error_metadata(source_meta);
    let mut model = render_model_to_compat_json(&ErrorDiagramRenderModel::new(&meta), &meta)
        .expect("Error typed model must remain JSON-serializable");
    common_db::apply_common_db_sanitization(&mut model, &meta.effective_config);
    ParsedDiagram { meta, model }
}

pub(crate) fn suppressed_error_render_diagram(source_meta: &ParseMetadata) -> ParsedDiagramRender {
    let meta = suppressed_error_metadata(source_meta);
    let model = ErrorDiagramRenderModel::new(&meta);
    ParsedDiagramRender::new(meta, RenderSemanticModel::Error(model))
}

fn suppressed_error_metadata(source_meta: &ParseMetadata) -> ParseMetadata {
    let mut meta = source_meta.clone();
    meta.diagram_type = "error".to_string();
    meta
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn typed_error_model_projects_exact_compatibility_json() {
        let meta = ParseMetadata {
            diagram_type: "error".to_string(),
            config: crate::MermaidConfig::default(),
            effective_config: crate::MermaidConfig::default(),
            title: None,
        };
        let compat = parse_error("", &meta).unwrap();
        let typed = parse_error_model_for_render("", &meta).unwrap();

        assert_eq!(render_model_to_compat_json(&typed, &meta).unwrap(), compat);
    }
}