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92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/* This file is (c) 2008-2012 Konstantin Isakov <ikm@goldendict.org>
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#ifndef __FOLDING_HH_INCLUDED__
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#define __FOLDING_HH_INCLUDED__
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#include "wstring.hh"
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#include <QString>
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/// Folding provides means to translate several possible ways to write a
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/// symbol into one. This facilitates searching. Here we currently perform
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/// full case folding (everything gets translated to lowercase, ligatures
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/// and complex letters are decomposed), diacritics folding (all diacritic
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/// marks get removed) and whitespace/punctuation marks removal. These
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/// transforms are done according to the Unicode standard and/or drafts. The
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/// exact algorithms, lists and types of folding performed might get changed
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/// in the future -- in this case, the Version field will be bumped up.
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namespace Folding {
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using gd::wstring;
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using gd::wchar;
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/// The algorithm's version.
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enum
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{
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Version = 5
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};
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/// Applies the folding algorithm to each character in the given string,
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/// making another one as a result.
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wstring apply( wstring const &, bool preserveWildcards = false );
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/// Applies only simple case folding algorithm. Since many dictionaries have
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/// different case style, we interpret words differing only by case as synonyms.
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wstring applySimpleCaseOnly( wstring const & );
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/// Applies only full case folding algorithm. This includes simple case, but also
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/// decomposing ligatures and complex letters.
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wstring applyFullCaseOnly( wstring const & );
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/// Applies only diacritics folding algorithm.
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wstring applyDiacriticsOnly( wstring const & );
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/// Applies only punctuation folding algorithm.
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wstring applyPunctOnly( wstring const & );
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/// Applies only whitespace folding algorithm.
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wstring applyWhitespaceOnly( wstring const & );
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/// Applies only whitespace&punctuation folding algorithm.
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wstring applyWhitespaceAndPunctOnly( wstring const & );
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/// Returns true if the given character is any form of whitespace, false
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/// otherwise. Whitespace corresponds to Zl/Zp/Zs Unicode classes, and also
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/// includes \n, \r and \t.
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bool isWhitespace( wchar ch );
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/// Returns true if the given character is any form of punctuation, false
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/// otherwise. Punctuation corresponds to Pc/Pd/Pe/Pf/Pi/Po/Ps classes.
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bool isPunct( wchar ch );
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/// Removes any whitespace or punctuation from the beginning and the end of
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/// the word.
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wstring trimWhitespaceOrPunct( wstring const & );
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/// Removes any whitespace from the beginning and the end of
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/// the word.
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wstring trimWhitespace( wstring const & );
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/// Turns any sequences of consecutive whitespace into a single basic space.
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void normalizeWhitespace( wstring & );
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/// Same as apply( wstring ), but without any heap operations, therefore
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/// preferable when there're many strings to process. Returns -1 if the
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/// operation succeded, or otherwise the minimum value of outSize required
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/// to succeed.
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/// Currently commented out, consider implementing it in case indices'
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/// generation would be too slow.
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//ssize_t apply( wchar const * in, wchar * out, size_t outSize );
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/// Unescape all wildcard symbols (for exast search)
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QString unescapeWildcardSymbols( QString const & );
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/// Escape all wildcard symbols (for place word to input line)
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QString escapeWildcardSymbols( QString const & );
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}
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#endif
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