geam 0.1.1

Experimental Rust-embedded execution runtime for typed Gleam programs
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use super::{write_call, write_function_call, write_projection};
use crate::plan::execution::explain::{Explain, ExplainContext};
use crate::plan::execution::function::UtfCodepointFunctionId;
use crate::plan::execution::graph::{
    CustomLocal, ParamLocal, TupleLocalId, UtfCodepointFunctionLocalId, UtfCodepointListLocalId,
};

pub(crate) enum UtfCodepointInstruction {
    Call {
        function: UtfCodepointFunctionId,
        args: Box<[ParamLocal]>,
        site: crate::plan::HostCallSite,
    },
    FunctionCall {
        function: UtfCodepointFunctionLocalId,
        args: Box<[ParamLocal]>,
        site: crate::plan::HostCallSite,
    },
    TupleIndex {
        tuple: TupleLocalId,
        index: usize,
    },
    CustomField {
        source: CustomLocal,
        index: usize,
    },
    ListIndex {
        list: UtfCodepointListLocalId,
        index: usize,
    },
}

impl Explain for UtfCodepointInstruction {
    fn write_explanation(&self, context: &mut ExplainContext<'_, '_>) {
        let output = context.output();
        match self {
            UtfCodepointInstruction::Call { function, args, .. } => {
                write_call(output, "utf_codepoint.call", function, args);
            }
            UtfCodepointInstruction::FunctionCall { function, args, .. } => {
                write_function_call(output, "utf_codepoint.function_call", function, args);
            }
            UtfCodepointInstruction::TupleIndex { tuple, index } => {
                write_projection(output, "utf_codepoint.tuple_index", tuple, *index);
            }
            UtfCodepointInstruction::CustomField { source, index } => {
                write_projection(output, "utf_codepoint.custom_field", source, *index);
            }
            UtfCodepointInstruction::ListIndex { list, index } => {
                write_projection(output, "utf_codepoint.list_index", list, *index);
            }
        }
    }
}

#[cfg(test)]
mod explain_tests {
    use crate::plan::execution::explain;
    use crate::plan::execution::function::TupleFunctionId;
    use crate::plan::execution::graph::ProfiledInstructionKind;

    #[test]
    fn writes_utf_codepoint_calls_and_projections() {
        let source = r#"
pub type Holder {
  Holder(value: UtfCodepoint)
}

fn point() -> UtfCodepoint {
  let assert <<value:utf8_codepoint>> = <<65>>
  value
}

fn point_value(value: UtfCodepoint) { value }
fn point_values(values: List(UtfCodepoint)) { values }

pub fn main() {
  let scalar = point()
  let function = point_value
  let values = point_values([scalar])
  let selected = case values {
    [value, ..] -> value
    _ -> scalar
  }
  let tuple = #(scalar)
  let holder = Holder(scalar)
  #(
    point_value(scalar),
    function(scalar),
    tuple.0,
    holder.value,
    selected,
  )
}
"#;
        let expected = concat!(
            "utf_codepoint.call utf_codepoint#0 args=[] | ",
            "utf_codepoint.list_index %list.utf_codepoint#0 index=0 | ",
            "utf_codepoint.call utf_codepoint#1 args=[%utf_codepoint#1] | ",
            "utf_codepoint.function_call %function.utf_codepoint#0 ",
            "args=[%utf_codepoint#1] | ",
            "utf_codepoint.tuple_index %tuple#0 index=0 | ",
            "utf_codepoint.custom_field %custom#0 index=0",
        );

        assert_explanation(source, expected);
    }

    fn write_separator(output: &mut String, first: &mut bool) {
        if *first {
            *first = false;
        } else {
            output.push_str(" | ");
        }
    }

    fn assert_explanation(source: &str, expected: &str) {
        explain::assert_rendered(source, expected, |plan, output| {
            let graph = plan.tuple_function(TupleFunctionId(0)).body().block_graph();
            let mut first = true;
            for instruction in graph.blocks().iter().flat_map(|block| block.instructions()) {
                if let ProfiledInstructionKind::UtfCodepoint(instruction) = instruction.kind() {
                    write_separator(output, &mut first);
                    let mut context = explain::ExplainContext::new(plan, output);
                    context.write(instruction);
                }
            }
        });
    }
}