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- Lean.Elab.Term.Quotation.resolveSectionVariable.loop sectionVars extractionResult x✝ x = []
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Transform sequence of pushes and appends into acceptable code
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- x.build = match x with | Sum.inl elems => Lean.quote `term elems | Sum.inr arr => arr
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- b.append arr appendName = Sum.inr (Lean.Syntax.mkCApp appendName #[b.build, { raw := arr }])
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match #
In a single match step, we match the first discriminant against the "head" of the first pattern of the first
alternative. This datatype describes what kind of check this involves, which helps other patterns decide if
they are covered by the same check and don't have to be checked again (see also MatchResult
).
- unconditional: Lean.Elab.Term.Quotation.HeadCheck
match step that always succeeds: _, x, `($x), ...
- shape: List Lean.SyntaxNodeKind → Option Nat → Lean.Elab.Term.Quotation.HeadCheck
match step based on kind and, optionally, arity of discriminant If
arity
is given, that number of new discriminants is introduced.covered
patterns should then introduce the same number of new patterns. We actually check the arity at run time only in the case ofnull
nodes since it should otherwise by implied by the node kind. without arity: `($x:k) with arity: any quotation without an antiquotation head pattern - slice: Nat → Nat → Lean.Elab.Term.Quotation.HeadCheck
Match step that succeeds on
null
nodes of arity at leastnumPrefix + numSuffix
, introducing discriminants for the firstnumPrefix
children, onenull
node for those in between, and for thenumSuffix
last children. example:([$x, $xs,*, $y]) is
slice 2 2` - other: Lean.Syntax → Lean.Elab.Term.Quotation.HeadCheck
other, complicated match step that will probably only cover identical patterns example: antiquotation splices `($[...]*)
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Describe whether a pattern is covered by a head check (induced by the pattern itself or a different pattern).
- covered: (Lean.Elab.Term.Quotation.Alt → Lean.Elab.TermElabM Lean.Elab.Term.Quotation.Alt) →
Bool → Lean.Elab.Term.Quotation.MatchResult
Pattern agrees with head check, remove and transform remaining alternative. If
exhaustive
isfalse
, also include unchanged alternative in the "no" branch. - uncovered: Lean.Elab.Term.Quotation.MatchResult
Pattern disagrees with head check, include in "no" branch only
- undecided: Lean.Elab.Term.Quotation.MatchResult
Pattern is not quite sure yet; include unchanged in both branches
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All necessary information on a pattern head.
check induced by the pattern
compute compatibility of pattern with given head check
- doMatch : (List Lean.Term → Lean.Elab.TermElabM Lean.Term) → Lean.Elab.TermElabM Lean.Term → Lean.Elab.TermElabM Lean.Term
actually run the specified head check, with the discriminant bound to
__discr
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