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Harden skip in Scanner #21607

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Sep 20, 2024
Merged

Harden skip in Scanner #21607

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10 changes: 7 additions & 3 deletions compiler/src/dotty/tools/dotc/parsing/Scanners.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -306,11 +306,15 @@ object Scanners {
println(s"\nSTART SKIP AT ${sourcePos().line + 1}, $this in $currentRegion")
var noProgress = 0
// Defensive measure to ensure we always get out of the following while loop
// even if source file is weirly formatted (i.e. we never reach EOF
// even if source file is weirly formatted (i.e. we never reach EOF)
var prevOffset = offset
while !atStop && noProgress < 3 do
val prevOffset = offset
nextToken()
if offset == prevOffset then noProgress += 1 else noProgress = 0
if offset <= prevOffset then
noProgress += 1
else
prevOffset = offset
noProgress = 0
if debugTokenStream then
println(s"\nSTOP SKIP AT ${sourcePos().line + 1}, $this in $currentRegion")
if token == OUTDENT then dropUntil(_.isInstanceOf[Indented])
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