Function validate_graph_expression

graphlite/src/ast/validator.rs:2411–2435

Validate graph expression

(
    graph_expr: &GraphExpression,
    _ctx: &mut ValidationContext,
    errors: &mut Vec<ValidationError>,
)

/// Validate graph expression
fn validate_graph_expression(
    graph_expr: &GraphExpression,
    _ctx: &mut ValidationContext,
    errors: &mut Vec<ValidationError>,
) {
    match graph_expr {
        GraphExpression::Reference(path) => {
            if path.segments.is_empty() {
                errors.push(ValidationError {
                    message: "Graph reference path cannot be empty".to_string(),
                    location: Some(path.location.clone()),
                    error_type: ValidationErrorType::Semantic,
                });
            }
        }
        GraphExpression::Union { left, right, .. } => {
            validate_graph_expression(left, _ctx, errors);
            validate_graph_expression(right, _ctx, errors);
        }
        GraphExpression::CurrentGraph => {
            // CurrentGraph is valid - it refers to the session's current graph
            // No validation needed
        }
    }
}

/// Validate match clause
fn validate_match_clause(