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| author | John MacFarlane <jgm@berkeley.edu> | 2018-01-13 12:10:52 -0800 |
|---|---|---|
| committer | John MacFarlane <jgm@berkeley.edu> | 2018-01-13 12:11:36 -0800 |
| commit | 44222e0373f47c986833a609271d495d55ff48de (patch) | |
| tree | 64c77bc0d7c98e69030c3ae8dda2dadf5881c847 /src/Text/Pandoc | |
| parent | 944ed5e0987e5069bfe70504e948f45a84f57324 (diff) | |
| download | pandoc-44222e0373f47c986833a609271d495d55ff48de.tar.gz | |
LaTeX reader: allow macro definitions inside macros.
Previously we went into an infinite loop with
```
\newcommand{\noop}[1]{#1}
\noop{\newcommand{\foo}[1]{#1}}
\foo{hi}
```
See #4253.
Diffstat (limited to 'src/Text/Pandoc')
| -rw-r--r-- | src/Text/Pandoc/Readers/LaTeX.hs | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/src/Text/Pandoc/Readers/LaTeX.hs b/src/Text/Pandoc/Readers/LaTeX.hs index 62d240688..d9b188606 100644 --- a/src/Text/Pandoc/Readers/LaTeX.hs +++ b/src/Text/Pandoc/Readers/LaTeX.hs @@ -442,19 +442,22 @@ doMacros n = do Just o -> (:) <$> option o bracketedToks <*> count (numargs - 1) getarg - let addTok (Tok _ (Arg i) _) acc | i > 0 - , i <= numargs = - foldr addTok acc (args !! (i - 1)) + -- first boolean param is true if we're tokenizing + -- an argument (in which case we don't want to + -- expand #1 etc.) + let addTok False (Tok _ (Arg i) _) acc | i > 0 + , i <= numargs = + foldr (addTok True) acc (args !! (i - 1)) -- add space if needed after control sequence -- see #4007 - addTok (Tok _ (CtrlSeq x) txt) + addTok _ (Tok _ (CtrlSeq x) txt) acc@(Tok _ Word _ : _) | not (T.null txt) && (isLetter (T.last txt)) = Tok spos (CtrlSeq x) (txt <> " ") : acc - addTok t acc = setpos spos t : acc + addTok _ t acc = setpos spos t : acc ts' <- getInput - setInput $ foldr addTok ts' newtoks + setInput $ foldr (addTok False) ts' newtoks case expansionPoint of ExpandWhenUsed -> if n > 20 -- detect macro expansion loops |