[Geany-devel] New messages/output parsing proposition
dimitar.zhekov at xxxxx
Thu Aug 25 17:34:59 UTC 2011
0. Not having the Lex imagination, and not wanting to integrate a Real
Parser into Geany and push it onto the users, I ended up with a pretty
simple universal parsing proposition - mostly a combination of what
we already have.
1. A message is parsed using:
regex: Extended syntax regular expression with subexpressions.
line_idx: 1-based index of the line number subexpression. If zero,
Geany will read the first two (or three, if there is a third) matches,
and check whether the first or second match is purely digits. If so,
it'll try to use the matches as <line> [column] <filename>, or as
<filename> <line> [column].
If line_idx is non-zero, the matching text must start with a number,
and the following additional 1-based subexpression indexes may be
file_idx - File name index. If 0 (not recommended), the current editor
file name will be used. If non-zero, the matching text must be
column_idx - Column # index, 0 = none. Ignored if the matching text
does not start with a number.
warn_idx (error_regex only) - Warning index, 0 = none. If the matching
text is not empty, the parsed message will be considered a warning
rather that an error.
2. Some examples:
the standard grep-line syntax
"libtool *--mode=link| from ([:]+):([0-9]+)[,:]([0-9]+[,:])?$" \
"|^([:]+):([0-9]+):([0-9]+:)? (warning: )?"
file_idx=1, line_idx=2, col_idx=3, warn_idx=4 :)
gcc/g++ syntax, ignoring libtool --mode=link (see msgwindow.c)
3. Recommendations for writing regular expressions:
The default file_idx is 0, so if you specity line_idx > 0, be sure to
set file_idx > 0 too (unless the message does not contain a filename).
For more precise parsing, try to match the start or end of line, or
some unambigous text.
Exclude the delimiter following an subexpression: "[^:]+:" instead of
".+:" (note that Geany assumes colon-less document names).
4. Rationalle for an explicitly specified line/column # to start with
a number instead being purely digits:
You can always specify a purely-digit subexpression.
For some messages, it may be easier to define the line and column
including some trailing text in the subexpression.
5. Initial implementation:
The buildin parsing will match the current behaviour, with some
The list model should either be removed and left to filename-line-
[column] parsing, or used to store the parsing results. Personally I
prefer the former. Combining the parts into a string and parsing them
back seems a bit awkward, but such things happen in programming.
6. Possible extensions:
More than one user-defined regex and set of indexes: error_regex_1,
When building, attempt all default expressions, and check if the
filename matches the well-known extensions for this expression. For
the 1st line in a build output, the current-file-type-expression is
tried first. For the next lines, the last successful (best-matching)
expression is tried first.
copy_idx - Index of the text to be copied on right-click Copy, 0 if
none. If the matching text is empty, the entire line will be copied.
Allow the plugins to define their own expressions for the messages
tab (which will make the list model obsolete).
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