Backreferences in source-highlight 2.7
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Backreferences in source-highlight 2.7
by gnombat
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I'm having trouble with backreferences in source-highlight 2.7. If I
create a language definition file named foo.lang: keyword = `a(.)\1` And then I create a test file example.foo: aaa abb acc a** a@@ And then I run source-highlight: source-highlight --lang-def=foo.lang example.foo Then "aaa", "abb" and "acc" are highlighted, but "a**" and "a@@" are not. Shouldn't the dot match any character? _______________________________________________ Help-source-highlight mailing list Help-source-highlight@... http://lists.gnu.org/mailman/listinfo/help-source-highlight |
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Re: Backreferences in source-highlight 2.7
by Lorenzo Bettini
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gnombat wrote:
> I'm having trouble with backreferences in source-highlight 2.7. If I > create a language definition file named foo.lang: > > keyword = `a(.)\1` > > And then I create a test file example.foo: > > aaa abb acc a** a@@ > > And then I run source-highlight: > > source-highlight --lang-def=foo.lang example.foo > > Then "aaa", "abb" and "acc" are highlighted, but "a**" and "a@@" are > not. Shouldn't the dot match any character? yes you're right, so this must be a bug... I'll try to work on it tomorrow thanks for the feedback! cheers Lorenzo -- Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze ICQ# lbetto, 16080134 (GNU/Linux User # 158233) HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com BLOGS: http://tronprog.blogspot.com http://longlivemusic.blogspot.com http://www.gnu.org/software/src-highlite http://www.gnu.org/software/gengetopt http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net _______________________________________________ Help-source-highlight mailing list Help-source-highlight@... http://lists.gnu.org/mailman/listinfo/help-source-highlight |
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Re: Backreferences in source-highlight 2.7
by gnombat
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Lorenzo Bettini wrote:
> gnombat wrote: >> I'm having trouble with backreferences in source-highlight 2.7. If I >> create a language definition file named foo.lang: >> >> keyword = `a(.)\1` >> >> And then I create a test file example.foo: >> >> aaa abb acc a** a@@ >> >> And then I run source-highlight: >> >> source-highlight --lang-def=foo.lang example.foo >> >> Then "aaa", "abb" and "acc" are highlighted, but "a**" and "a@@" are >> not. Shouldn't the dot match any character? > > yes you're right, so this must be a bug... > > I'll try to work on it tomorrow > > thanks for the feedback! > cheers > Lorenzo > I think I figured out what is going on: is_to_isolate from regexpstatebuilder.cpp is treating the regular expression as an alphanumerical string because `a(.)\1` starts and ends with a letter or number. /** * An expression is isolated basically if it is an alphanumerical * string * TODO check whether this is actually correct in principle * @param s * @return */ bool is_to_isolate(const string &s) { if (s.size()) { if ((isalnum(s[0]) || s[0] == '_') && (isalnum(s[s.size()-1]) || s[s.size()-1] == '_')) return true; } return false; } Then the whole regular expression gets surrounded with word boundary characters. This causes the match to fail with "a**" and "a@@". _______________________________________________ Help-source-highlight mailing list Help-source-highlight@... http://lists.gnu.org/mailman/listinfo/help-source-highlight |
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Re: Re: Backreferences in source-highlight 2.7
by Lorenzo Bettini
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gnombat wrote:
> Lorenzo Bettini wrote: >> gnombat wrote: >>> I'm having trouble with backreferences in source-highlight 2.7. If I >>> create a language definition file named foo.lang: >>> >>> keyword = `a(.)\1` >>> >>> And then I create a test file example.foo: >>> >>> aaa abb acc a** a@@ >>> >>> And then I run source-highlight: >>> >>> source-highlight --lang-def=foo.lang example.foo >>> >>> Then "aaa", "abb" and "acc" are highlighted, but "a**" and "a@@" are >>> not. Shouldn't the dot match any character? >> >> yes you're right, so this must be a bug... >> >> I'll try to work on it tomorrow >> >> thanks for the feedback! >> cheers >> Lorenzo >> > > I think I figured out what is going on: is_to_isolate from > regexpstatebuilder.cpp is treating the regular expression as an > alphanumerical string because `a(.)\1` starts and ends with a letter or > number. > > /** > * An expression is isolated basically if it is an alphanumerical > * string > * TODO check whether this is actually correct in principle > * @param s > * @return > */ > bool is_to_isolate(const string &s) { > if (s.size()) { > if ((isalnum(s[0]) || s[0] == '_') && (isalnum(s[s.size()-1]) || > s[s.size()-1] == '_')) > return true; > } > > return false; > } > > Then the whole regular expression gets surrounded with word boundary > characters. This causes the match to fail with "a**" and "a@@". Yes you're right! I'll have to fix the code calling is_to_isolate (in the case of a ` ` is_to_isolate probably should not be called at all) hope to have a fix soon thanks again Lorenzo -- Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze ICQ# lbetto, 16080134 (GNU/Linux User # 158233) HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com BLOGS: http://tronprog.blogspot.com http://longlivemusic.blogspot.com http://www.gnu.org/software/src-highlite http://www.gnu.org/software/gengetopt http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net _______________________________________________ Help-source-highlight mailing list Help-source-highlight@... http://lists.gnu.org/mailman/listinfo/help-source-highlight |
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Re: Backreferences in source-highlight 2.7
by Lorenzo Bettini
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gnombat wrote:
> I'm having trouble with backreferences in source-highlight 2.7. If I > create a language definition file named foo.lang: > > keyword = `a(.)\1` > > And then I create a test file example.foo: > > aaa abb acc a** a@@ > > And then I run source-highlight: > > source-highlight --lang-def=foo.lang example.foo > > Then "aaa", "abb" and "acc" are highlighted, but "a**" and "a@@" are > not. Shouldn't the dot match any character? > Hi there the temporary version you find here http://rap.dsi.unifi.it/~bettini/source-highlight-2.7.tar.gz should fix this problem hoep to hear from you soon Lorenzo -- Lorenzo Bettini, PhD in Computer Science, DSI, Univ. di Firenze ICQ# lbetto, 16080134 (GNU/Linux User # 158233) HOME: http://www.lorenzobettini.it MUSIC: http://www.purplesucker.com BLOGS: http://tronprog.blogspot.com http://longlivemusic.blogspot.com http://www.gnu.org/software/src-highlite http://www.gnu.org/software/gengetopt http://www.gnu.org/software/gengen http://doublecpp.sourceforge.net _______________________________________________ Help-source-highlight mailing list Help-source-highlight@... http://lists.gnu.org/mailman/listinfo/help-source-highlight |
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