59 lines
1.9 KiB
Rust
59 lines
1.9 KiB
Rust
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use value::{FloatType, IntType};
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use Error;
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use Function;
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use Value;
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pub fn builtin_function(identifier: &str) -> Option<Function> {
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match identifier {
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"min" => Some(Function::new(
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None,
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Box::new(|arguments| {
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let mut min_int = IntType::max_value();
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let mut min_float = 1.0f64 / 0.0f64;
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debug_assert!(min_float.is_infinite());
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for argument in arguments {
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if let Value::Float(float) = argument {
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min_float = min_float.min(*float);
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} else if let Value::Int(int) = argument {
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min_int = min_int.min(*int);
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} else {
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return Err(Error::expected_number(argument.clone()));
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}
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}
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if (min_int as FloatType) < min_float {
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Ok(Value::Int(min_int))
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} else {
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Ok(Value::Float(min_float))
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}
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}),
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)),
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"max" => Some(Function::new(
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None,
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Box::new(|arguments| {
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let mut max_int = IntType::min_value();
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let mut max_float = -1.0f64 / 0.0f64;
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debug_assert!(max_float.is_infinite());
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for argument in arguments {
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if let Value::Float(float) = argument {
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max_float = max_float.max(*float);
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} else if let Value::Int(int) = argument {
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max_int = max_int.max(*int);
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} else {
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return Err(Error::expected_number(argument.clone()));
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}
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}
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if (max_int as FloatType) > max_float {
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Ok(Value::Int(max_int))
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} else {
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Ok(Value::Float(max_float))
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}
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}),
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)),
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_ => None,
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}
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}
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