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final db models wip

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timurgordon
2025-06-03 21:51:21 +03:00
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commit c3f6b91aa0
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edition = "2021"
[dependencies]
rhai = "1.21.0"
chrono = "0.4"

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# Rhai Adapter Macros (`adapter_macros`)
This crate provides utility macros to facilitate the integration of Rust code with the Rhai scripting engine, particularly for adapting function and method signatures.
## Purpose
Rhai often uses `i64` as its default integer type. When exposing Rust functions or methods that use other integer types (e.g., `u32`, `usize`), direct registration can lead to type mismatches or require manual conversion boilerplate in each registered function.
These macros help bridge this gap by wrapping your Rust functions/methods, automatically handling the conversion from Rhai's `i64` to the Rust-native integer type and providing more informative error messages if the conversion fails (e.g., due to overflow).
## Macros
### 1. `adapt_rhai_i64_input_fn!(rust_fn:path, rust_int_ty:ty)`
Adapts a standalone Rust function that takes a single argument of `rust_int_ty` and returns `Result<_, Box<rhai::EvalAltResult>>`.
- `rust_fn`: The path to your Rust function (e.g., `my_module::my_function`).
- `rust_int_ty`: The integer type your Rust function expects (e.g., `u32`).
**Example Usage in Rust (when registering with Rhai Engine):**
```rust
// In your Rust code where you set up the Rhai engine:
// Assuming your_function(val: u32) -> Result<Something, Error> exists
// and adapter_macros is a dependency.
engine.register_fn("my_rhai_func", adapter_macros::adapt_rhai_i64_input_fn!(my_module::your_function, u32));
// In Rhai script:
// my_rhai_func(10); // 10 (i64) will be converted to u32 for your_function
```
### 2. `adapt_rhai_i64_input_method!(struct_ty:ty, rust_method_name:ident, rust_int_ty:ty)`
Adapts a Rust instance method that takes `self` by value, a single integer argument of `rust_int_ty`, and returns `Self`. This is useful for builder-like patterns or methods that modify and return the instance.
- `struct_ty`: The type of the struct on which the method is defined (e.g., `MyStruct`).
- `rust_method_name`: The identifier of the Rust method (e.g., `with_value`).
- `rust_int_ty`: The integer type your Rust method's argument expects (e.g., `u16`).
**Example Usage in Rust (when registering with Rhai Engine):**
```rust
// In your Rust code:
// Assuming MyStruct has a method: fn with_value(self, val: u16) -> Self
// and adapter_macros is a dependency.
engine.register_fn("with_value", adapter_macros::adapt_rhai_i64_input_method!(MyStruct, with_value, u16));
// In Rhai script:
// let my_obj = MyStruct::new();
// my_obj.with_value(5); // 5 (i64) will be converted to u16 for MyStruct::with_value
```
## Error Handling
If the `i64` value from Rhai cannot be converted to `rust_int_ty` (e.g., an `i64` value of -1 is passed when `u32` is expected, or a value too large for `u16`), the macros will generate a `rhai::EvalAltResult::ErrorArithmetic` with a descriptive message and the script position.
## How It Works
The macros generate a closure that:
1. Takes a `rhai::NativeCallContext` and an `i64` from the Rhai engine.
2. Attempts to convert the `i64` to the specified `rust_int_ty` using `try_into()`.
3. If conversion fails, it returns an `ErrorArithmetic` detailing the function/method name and the type conversion that failed.
4. If conversion succeeds, it calls the original Rust function/method with the converted value.
## Adding to Your Project
Add this to your `Cargo.toml`:
```toml
[dependencies]
adapter_macros = { path = "../adapter_macros" } # Or version = "0.1.0" if published
rhai = "x.y.z" # Your rhai version
```
Ensure the path to `adapter_macros` is correct if used locally.

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/// Macro to adapt a Rust function taking a specific integer type (e.g., u32)
/// to a Rhai function that expects an i64 argument.
#[macro_export]
macro_rules! adapt_rhai_i64_input_fn {
($rust_fn:path, $rust_int_ty:ty) => {
move |context: ::rhai::NativeCallContext, rhai_val: i64| -> Result<_, Box<::rhai::EvalAltResult>> {
let rust_val: $rust_int_ty = rhai_val.try_into().map_err(|_e| {
Box::new(::rhai::EvalAltResult::ErrorArithmetic(
format!("Conversion error for arg in '{}' from i64 to {}", stringify!($rust_fn), stringify!($rust_int_ty)),
context.position(),
))
})?;
Ok($rust_fn(rust_val))
}
};
}
/// Macro to adapt a Rust instance method (taking self by value, one int arg, returns Self)
/// to a Rhai function that expects an i64 for that integer argument.
#[macro_export]
macro_rules! adapt_rhai_i64_input_method {
($struct_ty:ty, $rust_method_name:ident, $rust_int_ty:ty) => {
move |context: ::rhai::NativeCallContext, instance: $struct_ty, rhai_val: i64| -> Result<$struct_ty, Box<::rhai::EvalAltResult>> {
let rust_val: $rust_int_ty = rhai_val.try_into().map_err(|_e| {
Box::new(::rhai::EvalAltResult::ErrorArithmetic(
format!("Conversion error for arg in '{}::{}' from i64 to {}", stringify!($struct_ty), stringify!($rust_method_name), stringify!($rust_int_ty)),
context.position(),
))
})?;
Ok(instance.$rust_method_name(rust_val))
}
};
}
// --- Rhai Timestamp Helper Functions ---
pub mod rhai_timestamp_helpers {
use rhai::{INT, EvalAltResult, Position};
use chrono::{DateTime, Utc, TimeZone};
pub fn datetime_to_rhai_timestamp(dt: &DateTime<Utc>) -> INT {
dt.timestamp()
}
pub fn option_datetime_to_rhai_timestamp(dt_opt: &Option<DateTime<Utc>>) -> Option<INT> {
dt_opt.as_ref().map(datetime_to_rhai_timestamp)
}
pub fn rhai_timestamp_to_datetime(ts: INT) -> Result<DateTime<Utc>, Box<EvalAltResult>> {
Utc.timestamp_opt(ts, 0).single()
.ok_or_else(|| Box::new(EvalAltResult::ErrorArithmetic(format!("Invalid Unix timestamp: {}", ts), Position::NONE)))
}
pub fn option_rhai_timestamp_to_datetime(ts_opt: Option<INT>) -> Result<Option<DateTime<Utc>>, Box<EvalAltResult>> {
match ts_opt {
Some(ts) => rhai_timestamp_to_datetime(ts).map(Some),
None => Ok(None),
}
}
}
// --- Macro for Enum Accessors (String Conversion) ---
#[macro_export]
macro_rules! register_rhai_enum_accessors {
($engine:expr, $struct_type:ty, $field_name:ident, $rhai_name:expr, $to_string_fn:path, $from_string_fn:path) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> rhai::ImmutableString { $to_string_fn(&obj.$field_name) },
move |obj: &mut $struct_type, val: rhai::ImmutableString| -> Result<(), Box<rhai::EvalAltResult>> {
obj.$field_name = $from_string_fn(val.as_str())?;
Ok(())
}
);
};
}
// --- Macro for DateTime Accessors (Unix Timestamp INT) ---
#[macro_export]
macro_rules! register_rhai_datetime_accessors {
($engine:expr, $struct_type:ty, $field_path:ident, $rhai_name:expr, _required) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> rhai::INT {
let field_value = &obj.$field_path;
$crate::rhai_timestamp_helpers::datetime_to_rhai_timestamp(field_value)
},
move |obj: &mut $struct_type, val: rhai::INT| -> Result<(), Box<rhai::EvalAltResult>> {
obj.$field_path = $crate::rhai_timestamp_helpers::rhai_timestamp_to_datetime(val)?;
Ok(())
}
);
};
($engine:expr, $struct_type:ty, base_data.$field_name:ident, $rhai_name:expr, _required) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> rhai::INT {
let field_value = &obj.base_data.$field_name;
$crate::rhai_timestamp_helpers::datetime_to_rhai_timestamp(field_value)
},
move |obj: &mut $struct_type, val: rhai::INT| -> Result<(), Box<rhai::EvalAltResult>> {
obj.base_data.$field_name = $crate::rhai_timestamp_helpers::rhai_timestamp_to_datetime(val)?;
Ok(())
}
);
};
($engine:expr, $struct_type:ty, $field_path:ident, $rhai_name:expr) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> Option<rhai::INT> {
let field_value = &obj.$field_path;
$crate::rhai_timestamp_helpers::option_datetime_to_rhai_timestamp(field_value)
},
move |obj: &mut $struct_type, val_opt: Option<rhai::INT>| -> Result<(), Box<rhai::EvalAltResult>> {
obj.$field_path = $crate::rhai_timestamp_helpers::option_rhai_timestamp_to_datetime(val_opt)?;
Ok(())
}
);
};
($engine:expr, $struct_type:ty, base_data.$field_name:ident, $rhai_name:expr) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> Option<rhai::INT> {
let field_value = &obj.base_data.$field_name;
$crate::rhai_timestamp_helpers::option_datetime_to_rhai_timestamp(field_value)
},
move |obj: &mut $struct_type, val_opt: Option<rhai::INT>| -> Result<(), Box<rhai::EvalAltResult>> {
obj.base_data.$field_name = $crate::rhai_timestamp_helpers::option_rhai_timestamp_to_datetime(val_opt)?;
Ok(())
}
);
};
}
// --- Macro for Vec<String> Accessors ---
#[macro_export]
macro_rules! register_rhai_vec_string_accessors {
($engine:expr, $struct_type:ty, $field_name:ident, $rhai_name:expr) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| -> rhai::Array {
obj.$field_name.iter().map(|s| rhai::Dynamic::from(rhai::ImmutableString::from(s.as_str()))).collect()
},
move |obj: &mut $struct_type, val: rhai::Array| {
obj.$field_name = val.into_iter().map(|d| d.into_string().unwrap_or_default()).collect();
}
);
};
}
// --- Macro for Generic Field Accessors (Example: ImmutableString) ---
#[macro_export]
macro_rules! register_rhai_field_accessors {
($engine:expr, $struct_type:ty, $field_name:ident, $rhai_name:expr) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| obj.$field_name.clone(), // Assuming cloneable and directly Rhai compatible
move |obj: &mut $struct_type, val: rhai::Dynamic| { // Or specific type like ImmutableString
// This part would need more specific handling based on expected type
// For example, if it's always ImmutableString:
// if let Ok(s) = val.into_immutable_string() { obj.$field_name = s.into_owned(); }
// For now, let's assume it's a type that can be directly assigned from Dynamic if Dynamic holds the right type
// This is a simplification; real use might need obj.$field_name = val.try_cast().unwrap_or_default();
// However, register_get_set usually infers setter type from getter type.
// If getter is T, setter is fn(&mut S, T)
// So if getter is |obj| obj.field.clone() -> String, setter should be |obj, val: String|
// Let's assume string for now if using ImmutableString for Rhai
if let Ok(s_val) = val.into_immutable_string() {
obj.$field_name = s_val.into(); // Assumes field_name is String
} else {
// Handle error or default
eprintln!("Failed to cast for field {}", $rhai_name);
}
}
);
};
($engine:expr, $struct_type:ty, $field_name:ident, $rhai_name:expr, $rhai_type:ty) => {
$engine.register_get_set(
$rhai_name,
move |obj: &mut $struct_type| obj.$field_name.clone(),
move |obj: &mut $struct_type, val: $rhai_type| {
obj.$field_name = val;
}
);
};
}