Trait CompileErrorProvider 

pub trait CompileErrorProvider {
    // Required methods
    fn no_errors(&self) -> bool;
    fn error_data(&mut self) -> Vec<String>;
}

Available on crate feature _helpers only.

Helper utilities for building procedural macros Collect and provide error information for expr_error_wrap.

Types implementing this trait can accumulate error messages and then show errors at the problematic code block by using expr_error_wrap.

Examples

Basic Usage with Vec<String>

let mut errors = Vec::<String>::new();
errors.push("Invalid syntax".to_string());
errors.push("Missing required field".to_string());

assert!(!errors.no_errors());
let error_messages = errors.error_data();
assert!(errors.no_errors());

Custom Implementation

#[derive(Default)]
struct ValidationErrors {
    errors: Vec<String>,
    other_data: String,
}

impl ValidationErrors {
    fn add_error(&mut self, msg: &str) {
        self.errors.push(msg.to_string());
    }
}

impl CompileErrorProvider for ValidationErrors {
    fn no_errors(&self) -> bool {
        self.errors.no_errors()
    }

    fn error_data(&mut self) -> Vec<String> {
        self.errors.error_data()
    }
}

let mut validator = ValidationErrors::default();
validator.add_error("Field 'name' is required");
validator.add_error("Field 'age' must be a positive number");

assert!(!validator.no_errors());
let messages = validator.error_data();
assert_eq!(messages.len(), 2);
assert!(validator.no_errors());

Required Methods

fn no_errors(&self) -> bool

Returns true if there are no errors, false otherwise.

This method is used to check whether error wrapping is needed.

fn error_data(&mut self) -> Vec<String>

Removes and returns all error data from the collection.

After calling this method, the error collection should be empty. The returned vector contains all accumulated error messages.

Note

Vec<String> implements this trait, so you can use it directly for simple error collection.

Returns

A vector of error messages that were accumulated

Implementations on Foreign Types

impl CompileErrorProvider for Vec<String>

fn no_errors(&self) -> bool

fn error_data(&mut self) -> Vec<String>

Implementors