QGIS API Documentation  3.25.0-Master (10b47c2603)
qgshstoreutils.cpp
Go to the documentation of this file.
1 /***************************************************************************
2  qgshstoreutils.h
3  ---------------------
4  begin : Sept 2018
5  copyright : (C) 2018 by Mathieu Pellerin
6  email : nirvn dot asia at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #include "qgshstoreutils.h"
17 
18 #include <QRegularExpression>
19 
20 QVariantMap QgsHstoreUtils::parse( const QString &string )
21 {
22  QVariantMap map;
23  QList<QString> bits;
24  static const QList<QString > sSeps{ "=>", "," };
25 
26  int i = 0;
27  while ( i < string.length() )
28  {
29  while ( i < string.length() && string.at( i ).isSpace() )
30  ++i;
31  const QString current = string.mid( i );
32  const QString sep = sSeps.at( bits.length() );
33  if ( current.startsWith( '"' ) )
34  {
35  const QRegularExpression re( QStringLiteral( "^\"((?:\\\\.|[^\"\\\\])*)\".*" ) );
36  const QRegularExpressionMatch match = re.match( current );
37  bits << QString();
38  if ( match.hasMatch() )
39  {
40  bits[bits.length() - 1] = match.captured( 1 ).replace( QLatin1String( "\\\"" ), QLatin1String( "\"" ) ).replace( QLatin1String( "\\\\" ), QLatin1String( "\\" ) );
41  i += match.captured( 1 ).length() + 2;
42  while ( i < string.length() && string.at( i ).isSpace() )
43  ++i;
44 
45  if ( QStringView{string}.mid( i ).startsWith( sep ) )
46  {
47  i += sep.length();
48  }
49  else if ( i < string.length() )
50  {
51  // hstore string format broken, end construction
52  i += current.length();
53  }
54  }
55  else
56  {
57  // hstore string format broken, end construction
58  i += current.length();
59  bits[bits.length() - 1] = current.trimmed();
60  }
61  }
62  else
63  {
64  const int sepPos = current.indexOf( sep );
65  if ( sepPos < 0 )
66  {
67  i += current.length();
68  bits << current.trimmed();
69  }
70  else
71  {
72  i += sepPos + sep.length();
73  bits << current.left( sepPos ).trimmed();
74  }
75  }
76 
77  if ( bits.length() == 2 )
78  {
79  if ( !bits.at( 0 ).isEmpty() && !bits.at( 1 ).isEmpty() )
80  map[ bits.at( 0 ) ] = bits.at( 1 );
81  bits.clear();
82  }
83  }
84 
85  return map;
86 }
87 
88 QString QgsHstoreUtils::build( const QVariantMap &map )
89 {
90  QStringList list;
91  for ( QVariantMap::const_iterator it = map.constBegin(); it != map.constEnd(); ++it )
92  {
93  QString key = it.key();
94  QString value = it.value().toString();
95  list << QString( "\"%1\"=>\"%2\"" ).arg( key.replace( "\\", "\\\\" ).replace( "\"", "\\\"" ),
96  value.replace( "\\", "\\\\" ).replace( "\"", "\\\"" ) );
97  }
98  return list.join( ',' );
99 }
CORE_EXPORT QString build(const QVariantMap &map)
Build a hstore-formatted string from a QVariantMap.
CORE_EXPORT QVariantMap parse(const QString &string)
Returns a QVariantMap object containing the key and values from a hstore-formatted string.