wdl-engine 0.13.2

Execution engine for Workflow Description Language (WDL) documents.
Documentation 
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//! Implements the `max` function from the WDL standard library.

use wdl_analysis::types::PrimitiveType;
use wdl_ast::Diagnostic;

use super::CallContext;
use super::Callback;
use super::Function;
use super::Signature;
use crate::Value;

/// Returns the larger of two integer values.
///
/// https://github.com/openwdl/wdl/blob/wdl-1.2/SPEC.md#max
fn int_max(context: CallContext<'_>) -> Result<Value, Diagnostic> {
    debug_assert_eq!(context.arguments.len(), 2);
    debug_assert!(context.return_type_eq(PrimitiveType::Integer));

    let first = context
        .coerce_argument(0, PrimitiveType::Integer)
        .unwrap_integer();
    let second = context
        .coerce_argument(1, PrimitiveType::Integer)
        .unwrap_integer();
    Ok(first.max(second).into())
}

/// Returns the larger of two float values.
///
/// https://github.com/openwdl/wdl/blob/wdl-1.2/SPEC.md#max
fn float_max(context: CallContext<'_>) -> Result<Value, Diagnostic> {
    debug_assert_eq!(context.arguments.len(), 2);
    debug_assert!(context.return_type_eq(PrimitiveType::Float));

    let first = context
        .coerce_argument(0, PrimitiveType::Float)
        .unwrap_float();
    let second = context
        .coerce_argument(1, PrimitiveType::Float)
        .unwrap_float();
    Ok(first.max(second).into())
}

/// Gets the function describing `max`.
pub const fn descriptor() -> Function {
    Function::new(
        const {
            &[
                Signature::new("(a: Int, b: Int) -> Int", Callback::Sync(int_max)),
                Signature::new("(a: Int, b: Float) -> Float", Callback::Sync(float_max)),
                Signature::new("(a: Float, b: Int) -> Float", Callback::Sync(float_max)),
                Signature::new("(a: Float, b: Float) -> Float", Callback::Sync(float_max)),
            ]
        },
    )
}

#[cfg(test)]
mod test {
    use pretty_assertions::assert_eq;
    use wdl_ast::version::V1;

    use crate::v1::test::TestEnv;
    use crate::v1::test::eval_v1_expr;

    #[tokio::test]
    async fn max() {
        let env = TestEnv::default();
        let value = eval_v1_expr(&env, V1::One, "max(7, 42)").await.unwrap();
        assert_eq!(value.unwrap_integer(), 42);

        let value = eval_v1_expr(&env, V1::One, "max(42, 7)").await.unwrap();
        assert_eq!(value.unwrap_integer(), 42);

        let value = eval_v1_expr(&env, V1::One, "max(-42, 7)").await.unwrap();
        assert_eq!(value.unwrap_integer(), 7);

        let value = eval_v1_expr(&env, V1::One, "max(0, -42)").await.unwrap();
        assert_eq!(value.unwrap_integer(), 0);

        let value = eval_v1_expr(&env, V1::One, "max(0, 42)").await.unwrap();
        assert_eq!(value.unwrap_integer(), 42);

        let value = eval_v1_expr(&env, V1::One, "max(7.0, 42)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(42.0, 7)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(-42.0, 7)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 7.0);

        let value = eval_v1_expr(&env, V1::One, "max(0.0, -42)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 0.0);

        let value = eval_v1_expr(&env, V1::One, "max(0.0, 42)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(7, 42.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(42, 7.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(-42, 7.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 7.0);

        let value = eval_v1_expr(&env, V1::One, "max(0, -42.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 0.0);

        let value = eval_v1_expr(&env, V1::One, "max(0, 42.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(7.0, 42.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(42.0, 7.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(&env, V1::One, "max(-42.0, 7.0)")
            .await
            .unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 7.0);

        let value = eval_v1_expr(&env, V1::One, "max(0.0, -42.0)")
            .await
            .unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 0.0);

        let value = eval_v1_expr(&env, V1::One, "max(0.0, 42.0)").await.unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 42.0);

        let value = eval_v1_expr(
            &env,
            V1::One,
            "max(12345, max(-100, max(54321, 1234.5678)))",
        )
        .await
        .unwrap();
        approx::assert_relative_eq!(value.unwrap_float(), 54321.0);
    }
}