mu/lib/tokenize.cc

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lib: implement new query parser mu's query parser is the piece of software that turns your queries into something the Xapian database can understand. So, if you query "maildir:/inbox and subject:bla" this must be translated into a Xapian::Query object which will retrieve the sought after messages. Since mu's beginning, almost a decade ago, this parser was based on Xapian's default Xapian::QueryParser. It works okay, but wasn't really designed for the mu use-case, and had a bit of trouble with anything that's not A..Z (think: spaces, special characters, unicode etc.). Over the years, mu added quite a bit of pre-processing trickery to deal with that. Still, there were corner cases and bugs that were practically unfixable. The solution to all of this is to have a custom query processor that replaces Xapian's, and write it from the ground up to deal with the special characters etc. I wrote one, as part of my "future, post-1.0 mu" reseach project, and I have now backported it to the mu 0.9.19. From a technical perspective, this is a major cleanup, and allows us to get rid of much of the fragile preprocessing both for indexing and querying. From and end-user perspective this (hopefully) means that many of the little parsing issues are gone, and it opens the way for some new features. From an end-user perspective: - better support for special characters. - regexp search! yes, you can now search for regular expressions, e.g. subject:/h.ll?o/ will find subjects with hallo, hello, halo, philosophy, ... As you can imagine, this can be a _heavy_ operation on the database, and might take quite a bit longer than a normal query; but it can be quite useful.
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/*
** Copyright (C) 2017-2020 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
lib: implement new query parser mu's query parser is the piece of software that turns your queries into something the Xapian database can understand. So, if you query "maildir:/inbox and subject:bla" this must be translated into a Xapian::Query object which will retrieve the sought after messages. Since mu's beginning, almost a decade ago, this parser was based on Xapian's default Xapian::QueryParser. It works okay, but wasn't really designed for the mu use-case, and had a bit of trouble with anything that's not A..Z (think: spaces, special characters, unicode etc.). Over the years, mu added quite a bit of pre-processing trickery to deal with that. Still, there were corner cases and bugs that were practically unfixable. The solution to all of this is to have a custom query processor that replaces Xapian's, and write it from the ground up to deal with the special characters etc. I wrote one, as part of my "future, post-1.0 mu" reseach project, and I have now backported it to the mu 0.9.19. From a technical perspective, this is a major cleanup, and allows us to get rid of much of the fragile preprocessing both for indexing and querying. From and end-user perspective this (hopefully) means that many of the little parsing issues are gone, and it opens the way for some new features. From an end-user perspective: - better support for special characters. - regexp search! yes, you can now search for regular expressions, e.g. subject:/h.ll?o/ will find subjects with hallo, hello, halo, philosophy, ... As you can imagine, this can be a _heavy_ operation on the database, and might take quite a bit longer than a normal query; but it can be quite useful.
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**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public License
** as published by the Free Software Foundation; either version 2.1
** of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free
** Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
** 02110-1301, USA.
*/
#include <string>
#include <iostream>
#include "mu-tokenizer.hh"
lib: implement new query parser mu's query parser is the piece of software that turns your queries into something the Xapian database can understand. So, if you query "maildir:/inbox and subject:bla" this must be translated into a Xapian::Query object which will retrieve the sought after messages. Since mu's beginning, almost a decade ago, this parser was based on Xapian's default Xapian::QueryParser. It works okay, but wasn't really designed for the mu use-case, and had a bit of trouble with anything that's not A..Z (think: spaces, special characters, unicode etc.). Over the years, mu added quite a bit of pre-processing trickery to deal with that. Still, there were corner cases and bugs that were practically unfixable. The solution to all of this is to have a custom query processor that replaces Xapian's, and write it from the ground up to deal with the special characters etc. I wrote one, as part of my "future, post-1.0 mu" reseach project, and I have now backported it to the mu 0.9.19. From a technical perspective, this is a major cleanup, and allows us to get rid of much of the fragile preprocessing both for indexing and querying. From and end-user perspective this (hopefully) means that many of the little parsing issues are gone, and it opens the way for some new features. From an end-user perspective: - better support for special characters. - regexp search! yes, you can now search for regular expressions, e.g. subject:/h.ll?o/ will find subjects with hallo, hello, halo, philosophy, ... As you can imagine, this can be a _heavy_ operation on the database, and might take quite a bit longer than a normal query; but it can be quite useful.
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int
main(int argc, char* argv[])
lib: implement new query parser mu's query parser is the piece of software that turns your queries into something the Xapian database can understand. So, if you query "maildir:/inbox and subject:bla" this must be translated into a Xapian::Query object which will retrieve the sought after messages. Since mu's beginning, almost a decade ago, this parser was based on Xapian's default Xapian::QueryParser. It works okay, but wasn't really designed for the mu use-case, and had a bit of trouble with anything that's not A..Z (think: spaces, special characters, unicode etc.). Over the years, mu added quite a bit of pre-processing trickery to deal with that. Still, there were corner cases and bugs that were practically unfixable. The solution to all of this is to have a custom query processor that replaces Xapian's, and write it from the ground up to deal with the special characters etc. I wrote one, as part of my "future, post-1.0 mu" reseach project, and I have now backported it to the mu 0.9.19. From a technical perspective, this is a major cleanup, and allows us to get rid of much of the fragile preprocessing both for indexing and querying. From and end-user perspective this (hopefully) means that many of the little parsing issues are gone, and it opens the way for some new features. From an end-user perspective: - better support for special characters. - regexp search! yes, you can now search for regular expressions, e.g. subject:/h.ll?o/ will find subjects with hallo, hello, halo, philosophy, ... As you can imagine, this can be a _heavy_ operation on the database, and might take quite a bit longer than a normal query; but it can be quite useful.
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{
std::string s;
for (auto i = 1; i < argc; ++i)
s += " " + std::string(argv[i]);
const auto tvec = Mu::tokenize(s);
lib: implement new query parser mu's query parser is the piece of software that turns your queries into something the Xapian database can understand. So, if you query "maildir:/inbox and subject:bla" this must be translated into a Xapian::Query object which will retrieve the sought after messages. Since mu's beginning, almost a decade ago, this parser was based on Xapian's default Xapian::QueryParser. It works okay, but wasn't really designed for the mu use-case, and had a bit of trouble with anything that's not A..Z (think: spaces, special characters, unicode etc.). Over the years, mu added quite a bit of pre-processing trickery to deal with that. Still, there were corner cases and bugs that were practically unfixable. The solution to all of this is to have a custom query processor that replaces Xapian's, and write it from the ground up to deal with the special characters etc. I wrote one, as part of my "future, post-1.0 mu" reseach project, and I have now backported it to the mu 0.9.19. From a technical perspective, this is a major cleanup, and allows us to get rid of much of the fragile preprocessing both for indexing and querying. From and end-user perspective this (hopefully) means that many of the little parsing issues are gone, and it opens the way for some new features. From an end-user perspective: - better support for special characters. - regexp search! yes, you can now search for regular expressions, e.g. subject:/h.ll?o/ will find subjects with hallo, hello, halo, philosophy, ... As you can imagine, this can be a _heavy_ operation on the database, and might take quite a bit longer than a normal query; but it can be quite useful.
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for (const auto& t : tvec)
std::cout << t << std::endl;
return 0;
}