Function invoke_user_function

lib/dsc-lib/src/functions/user_function.rs:24–46

Invoke a user-defined function by name with the provided arguments and context. # Arguments `name` - The name of the user-defined function to invoke. `args` - The arguments to pass to the user-defined function. `context` - The current execution context. # Returns `Result ` - The result of the function invocation or an error. # Errors `DscError::Parser` - If the function is not f

(name: &str, args: &[Value], context: &Context)

/// * `DscError::Parser` - If the function is not found, parameters are invalid, or output type is incorrect.
///
pub fn invoke_user_function(name: &str, args: &[Value], context: &Context) -> Result<Value, DscError> {
    if let Some(function_definition) = context.user_functions.get(name) {
        validate_parameters(name, function_definition, args)?;
        let mut user_context = context.clone();
        user_context.process_mode = ProcessMode::UserFunction;
        // can only use its own parameters and not the global ones
        user_context.parameters.clear();
        // cannot call other user functions
        user_context.user_functions.clear();
        for (i, arg) in args.iter().enumerate() {
            let Some(params) = &function_definition.parameters else {
                return Err(DscError::Parser(t!("functions.userFunction.expectedNoParameters", name = name).to_string()));
            };
            user_context.parameters.insert(params[i].name.clone(), (arg.clone(), params[i].r#type.clone()));
        }
        let mut parser = Statement::new()?;
        let result = parser.parse_and_execute(&function_definition.output.value, &user_context)?;
        validate_output_type(name, function_definition, &result)?;
        Ok(result)
    } else {
        Err(DscError::Parser(t!("functions.userFunction.unknownUserFunction", name = name).to_string()))
    }
}

fn validate_parameters(name: &str, function_definition: &UserFunctionDefinition, args: &[Value]) -> Result<(), DscError> {
    if let Some(expected_params) = &function_definition.parameters {