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use super::*;
pub(super) struct ProofTreeFormatter<'a, 'b> {
f: &'a mut (dyn Write + 'b),
}
/// A formatter which adds 4 spaces of indentation to its input before
/// passing it on to its nested formatter.
///
/// We can use this for arbitrary levels of indentation by nesting it.
struct Indentor<'a, 'b> {
f: &'a mut (dyn Write + 'b),
on_newline: bool,
}
impl Write for Indentor<'_, '_> {
fn write_str(&mut self, s: &str) -> std::fmt::Result {
for line in s.split_inclusive('\n') {
if self.on_newline {
self.f.write_str(" ")?;
}
self.on_newline = line.ends_with('\n');
self.f.write_str(line)?;
}
Ok(())
}
}
impl<'a, 'b> ProofTreeFormatter<'a, 'b> {
pub(super) fn new(f: &'a mut (dyn Write + 'b)) -> Self {
ProofTreeFormatter { f }
}
fn nested<F, R>(&mut self, func: F) -> R
where
F: FnOnce(&mut ProofTreeFormatter<'_, '_>) -> R,
{
func(&mut ProofTreeFormatter { f: &mut Indentor { f: self.f, on_newline: true } })
}
pub(super) fn format_goal_evaluation(&mut self, eval: &GoalEvaluation<'_>) -> std::fmt::Result {
let goal_text = match eval.kind {
GoalEvaluationKind::Root { orig_values: _ } => "ROOT GOAL",
GoalEvaluationKind::Nested { is_normalizes_to_hack } => match is_normalizes_to_hack {
IsNormalizesToHack::No => "GOAL",
IsNormalizesToHack::Yes => "NORMALIZES-TO HACK GOAL",
},
};
writeln!(self.f, "{}: {:?}", goal_text, eval.uncanonicalized_goal)?;
self.nested(|this| this.format_canonical_goal_evaluation(&eval.evaluation))?;
if eval.returned_goals.len() > 0 {
writeln!(self.f, "NESTED GOALS ADDED TO CALLER: [")?;
self.nested(|this| {
for goal in eval.returned_goals.iter() {
writeln!(this.f, "ADDED GOAL: {goal:?},")?;
}
Ok(())
})?;
writeln!(self.f, "]")
} else {
Ok(())
}
}
pub(super) fn format_canonical_goal_evaluation(
&mut self,
eval: &CanonicalGoalEvaluation<'_>,
) -> std::fmt::Result {
writeln!(self.f, "GOAL: {:?}", eval.goal)?;
match &eval.kind {
CanonicalGoalEvaluationKind::Overflow => {
writeln!(self.f, "OVERFLOW: {:?}", eval.result)
}
CanonicalGoalEvaluationKind::CycleInStack => {
writeln!(self.f, "CYCLE IN STACK: {:?}", eval.result)
}
CanonicalGoalEvaluationKind::Evaluation { revisions } => {
for (n, step) in revisions.iter().enumerate() {
writeln!(self.f, "REVISION {n}")?;
self.nested(|this| this.format_evaluation_step(step))?;
}
writeln!(self.f, "RESULT: {:?}", eval.result)
}
}
}
pub(super) fn format_evaluation_step(
&mut self,
evaluation_step: &GoalEvaluationStep<'_>,
) -> std::fmt::Result {
writeln!(self.f, "INSTANTIATED: {:?}", evaluation_step.instantiated_goal)?;
self.format_probe(&evaluation_step.evaluation)
}
pub(super) fn format_probe(&mut self, probe: &Probe<'_>) -> std::fmt::Result {
match &probe.kind {
ProbeKind::Root { result } => {
writeln!(self.f, "ROOT RESULT: {result:?}")
}
ProbeKind::NormalizedSelfTyAssembly => {
writeln!(self.f, "NORMALIZING SELF TY FOR ASSEMBLY:")
}
ProbeKind::UnsizeAssembly => {
writeln!(self.f, "ASSEMBLING CANDIDATES FOR UNSIZING:")
}
ProbeKind::UpcastProjectionCompatibility => {
writeln!(self.f, "PROBING FOR PROJECTION COMPATIBILITY FOR UPCASTING:")
}
ProbeKind::MiscCandidate { name, result } => {
writeln!(self.f, "CANDIDATE {name}: {result:?}")
}
ProbeKind::TraitCandidate { source, result } => {
writeln!(self.f, "CANDIDATE {source:?}: {result:?}")
}
}?;
self.nested(|this| {
for step in &probe.steps {
match step {
ProbeStep::AddGoal(goal) => writeln!(this.f, "ADDED GOAL: {goal:?}")?,
ProbeStep::EvaluateGoals(eval) => this.format_added_goals_evaluation(eval)?,
ProbeStep::NestedProbe(probe) => this.format_probe(probe)?,
}
}
Ok(())
})
}
pub(super) fn format_added_goals_evaluation(
&mut self,
added_goals_evaluation: &AddedGoalsEvaluation<'_>,
) -> std::fmt::Result {
writeln!(self.f, "TRY_EVALUATE_ADDED_GOALS: {:?}", added_goals_evaluation.result)?;
for (n, iterations) in added_goals_evaluation.evaluations.iter().enumerate() {
writeln!(self.f, "ITERATION {n}")?;
self.nested(|this| {
for goal_evaluation in iterations {
this.format_goal_evaluation(goal_evaluation)?;
}
Ok(())
})?;
}
Ok(())
}
}
|
