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sanitize more possible input schemata of frac #246

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Dec 12, 2021
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sanitize more possible input schemata of frac #246

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c2cdaa5
sanitizing more possible input schemata of frac
julianuu Nov 6, 2021
f7ee1d5
make frac sanitization work for comments plus newlines too
julianuu Nov 6, 2021
1c9dc55
fix uninitialized value warning
julianuu Nov 8, 2021
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18 changes: 9 additions & 9 deletions latexdiff
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Original file line number Diff line number Diff line change
Expand Up @@ -2570,15 +2570,15 @@ sub take_comments_and_newline_from_frac() {
# some special magic for common usage of frac, which does not conform to the latexdiff requirements but can be made to fit
# note that this is a rare exception to the general rule that the new tex can be reconstructed from the diff file

# \frac12 -> \frac{1}{2}
s/\\frac(\d)(\w)/\\frac\{$1\}\{$2\}/g;

# \frac1{2b} -> \frac{1}{2b}
s/\\frac(\d)/\\frac\{$1\}/g;

# delete space and comment characters between \frac arguments
# s/\\frac(?:\s*?%[^\n]*?)*?(\{$pat_n\})\s*(\{$pat_n\})/\\frac$1$2/g;
s/\\frac(?:\s|%[^\n]*?)*(\{$pat_n\})(?:\s|%[^\n]*?)*(\{$pat_n\})/\\frac$1$2/g;
# regex that matches space and comment characters
my $space = qr/\s|%[^\n]*?/;
# \frac {abc} -> \frac{abc}
# \frac1 -> \frac{1}
# \frac a -> \frac{a}
# \frac \lambda -> \frac{\lambda}
s/\\frac(?|${space}+\{($pat_n)\}|${space}*(\d)|${space}+(\w)|${space}*(\\[a-zA-Z]+))/\\frac\{$1\}/g;
# same as above for the second argument of frac
s/\\frac(\{$pat_n\})(?|${space}*\{($pat_n)\}|${space}*(\d)|${space}+(\w)|${space}*(\\[a-zA-Z]+))/\\frac$1\{$2\}/g;
}

# preprocess($string, ..)
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