featherdb_query/expr/functions/
mod.rs

1//! Built-in function evaluation
2
3mod datetime;
4mod math;
5mod string;
6
7use featherdb_core::{Error, Result, Value};
8
9/// Evaluate a built-in function by name
10pub fn eval_function(name: &str, args: &[Value]) -> Result<Value> {
11    // Try string functions first
12    if let Some(result) = string::eval_string_function(name, args) {
13        return result;
14    }
15
16    // Try datetime functions
17    if let Some(result) = datetime::eval_datetime_function(name, args) {
18        return result;
19    }
20
21    // Try math/utility functions
22    if let Some(result) = math::eval_math_function(name, args) {
23        return result;
24    }
25
26    // Function not found
27    Err(Error::Unsupported {
28        feature: format!("Function: {}", name),
29    })
30}
31
32#[cfg(test)]
33mod tests {
34    use super::*;
35
36    #[test]
37    fn test_eval_function_string() {
38        assert_eq!(
39            eval_function("UPPER", &[Value::Text("hello".into())]).unwrap(),
40            Value::Text("HELLO".into())
41        );
42    }
43
44    #[test]
45    fn test_eval_function_datetime() {
46        assert_eq!(
47            eval_function("YEAR", &[Value::Text("2024-01-15".into())]).unwrap(),
48            Value::Integer(2024)
49        );
50    }
51
52    #[test]
53    fn test_eval_function_math() {
54        assert_eq!(
55            eval_function("ABS", &[Value::Integer(-5)]).unwrap(),
56            Value::Integer(5)
57        );
58    }
59
60    #[test]
61    fn test_eval_function_unknown() {
62        assert!(eval_function("UNKNOWN_FUNC", &[]).is_err());
63    }
64}
featherdb_query/expr/functions/mod.rs

featherdb_query/expr/functions/
mod.rs
