Function try_parse

nodedb-sql/src/ddl_ast/graph_parse/mod.rs:35–80

Entry point: returns `Some` when `sql` starts with a graph DSL keyword (`GRAPH ...`, `MATCH ...`, `OPTIONAL MATCH ...`), else `None` so the main DDL parser can continue trying other cases.

(sql: &str)

/// keyword (`GRAPH ...`, `MATCH ...`, `OPTIONAL MATCH ...`), else
/// `None` so the main DDL parser can continue trying other cases.
pub fn try_parse(sql: &str) -> Option<NodedbStatement> {
    let trimmed = sql.trim();
    let upper = trimmed.to_ascii_uppercase();

    if upper.starts_with("MATCH ") || upper.starts_with("OPTIONAL MATCH ") {
        return Some(NodedbStatement::Graph(GraphStmt::MatchQuery {
            body: trimmed.to_string(),
        }));
    }

    if !upper.starts_with("GRAPH ") {
        return None;
    }

    let toks = tokenizer::tokenize(trimmed);

    if upper.starts_with("GRAPH INSERT EDGE ") {
        return variants::parse_insert_edge(&toks);
    }
    if upper.starts_with("GRAPH DELETE EDGE ") {
        return variants::parse_delete_edge(&toks);
    }
    if upper.starts_with("GRAPH LABEL ") {
        return variants::parse_set_labels(&toks, false);
    }
    if upper.starts_with("GRAPH UNLABEL ") {
        return variants::parse_set_labels(&toks, true);
    }
    if upper.starts_with("GRAPH TRAVERSE ") {
        return variants::parse_traverse(&toks);
    }
    if upper.starts_with("GRAPH NEIGHBORS ") {
        return variants::parse_neighbors(&toks);
    }
    if upper.starts_with("GRAPH PATH ") {
        return variants::parse_path(&toks);
    }
    if upper.starts_with("GRAPH ALGO ") {
        return variants::parse_algo(&toks);
    }
    if upper.starts_with("GRAPH RAG FUSION ") {
        return variants::parse_rag_fusion(&toks, trimmed);
    }

    None
}

#[cfg(test)]
mod tests {