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-rw-r--r--src/Text/Pandoc/Readers/Markdown.hs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/Text/Pandoc/Readers/Markdown.hs b/src/Text/Pandoc/Readers/Markdown.hs
index b655ea1a9..9fe5c9f06 100644
--- a/src/Text/Pandoc/Readers/Markdown.hs
+++ b/src/Text/Pandoc/Readers/Markdown.hs
@@ -320,6 +320,9 @@ atxClosing = try $ skipMany (char '#') >> blanklines
setextHeader :: GenParser Char ParserState Block
setextHeader = try $ do
+ -- This lookahead prevents us from wasting time parsing Inlines
+ -- unless necessary -- it gives a significant performance boost.
+ lookAhead $ anyLine >> many1 (oneOf setextHChars) >> blankline
text <- many1Till inline newline
underlineChar <- oneOf setextHChars
many (char underlineChar)