/thirdparty/qxt/qxtweb-standalone/qxtweb/qxthtmltemplate.cpp
C++ | 156 lines | 60 code | 23 blank | 73 comment | 18 complexity | f7c01ab03881b7b1db56ccf733eba84e MD5 | raw file
1/**************************************************************************** 2 ** 3 ** Copyright (C) Qxt Foundation. Some rights reserved. 4 ** 5 ** This file is part of the QxtWeb module of the Qxt library. 6 ** 7 ** This library is free software; you can redistribute it and/or modify it 8 ** under the terms of the Common Public License, version 1.0, as published 9 ** by IBM, and/or under the terms of the GNU Lesser General Public License, 10 ** version 2.1, as published by the Free Software Foundation. 11 ** 12 ** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY 13 ** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY 14 ** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR 15 ** FITNESS FOR A PARTICULAR PURPOSE. 16 ** 17 ** You should have received a copy of the CPL and the LGPL along with this 18 ** file. See the LICENSE file and the cpl1.0.txt/lgpl-2.1.txt files 19 ** included with the source distribution for more information. 20 ** If you did not receive a copy of the licenses, contact the Qxt Foundation. 21 ** 22 ** <http://libqxt.org> <foundation@libqxt.org> 23 ** 24 ****************************************************************************/ 25 26/*! 27 \class QxtHtmlTemplate 28 \inmodule QxtWeb 29 \brief The QxtHtmlTemplate class provides a basic HTML template engine 30 31 open a file containing html code and php style variables. 32 use the square bracket operators to assign content for a variable 33 34 \code 35 QxtHtmlTemplate index; 36 if(!index.open) 37 return 404; 38 index["content"]="hello world"; 39 echo()<<index.render(); 40 \endcode 41 the realatet html code would look like: 42 \code 43 <html> 44 <head> 45 <title>Test Page</title> 46 </head> 47 <?=content?> 48 </html> 49 \endcode 50 51 funny storry: whe are using this class to make our documentation (eat your own dogfood, you know ;). 52 but when we where parsing exactly this file you read right now the first time, QxtHtmlTemplate got stuck in an infinite loop. guess why. becouse of that example above :D 53 So be warned: when you assign content to a variable that contains the variable name itself, render() will never return. 54 55 56*/ 57 58/*! 59 \fn QxtHtmlTemplate::open(const QString& filename) 60 Opens \a filename. Returns \c true on success and \c false on failure. 61 Note that it will also return false for an empty html file. 62 */ 63 64/*! 65 \fn QString QxtHtmlTemplate::render() const 66 Uses the variables you set and renders the opened file. 67 returns an empty string on failure. 68 Does NOT take care of not assigned variables, they will remain in the returned string 69 */ 70 71#include "qxthtmltemplate.h" 72#include <QFile> 73#include <QStringList> 74 75/*! 76 Constructs a new QxtHtmlTemplate. 77 */ 78QxtHtmlTemplate::QxtHtmlTemplate() : QMap<QString, QString>() 79{} 80 81/*! 82 Loads data \a d. 83 */ 84void QxtHtmlTemplate::load(const QString& d) 85{ 86 data = d; 87} 88 89bool QxtHtmlTemplate::open(const QString& filename) 90{ 91 QFile f(filename); 92 f.open(QIODevice::ReadOnly); 93 data = QString::fromLocal8Bit(f.readAll()); 94 f.close(); 95 if (data.isEmpty()) 96 { 97 qWarning("QxtHtmlTemplate::open(\"%s\") empty or nonexistent", qPrintable(filename)); 98 return false; 99 } 100 return true; 101} 102 103QString QxtHtmlTemplate::render() const 104{ 105 ///try to preserve indention by parsing char by char and saving the last non-space character 106 107 108 QString output = data; 109 int lastnewline = 0; 110 111 112 for (int i = 0;i < output.count();i++) 113 { 114 if (output.at(i) == '\n') 115 { 116 lastnewline = i; 117 } 118 119 if (output.at(i) == '<' && output.at(i + 1) == '?' && output.at(i + 2) == '=') 120 { 121 int j = i + 3; 122 QString var; 123 124 for (int jj = j;jj < output.count();jj++) 125 { 126 if (output.at(jj) == '?' && output.at(jj + 1) == '>') 127 { 128 j = jj; 129 break; 130 } 131 var += output.at(jj); 132 } 133 134 135 if (j == i) 136 { 137 qWarning("QxtHtmlTemplate::render() unterminated <?= "); 138 continue; 139 } 140 141 142 if (!contains(var)) 143 { 144 qWarning("QxtHtmlTemplate::render() unused variable \"%s\"", qPrintable(var)); 145 continue; 146 } 147 output.replace(i, j - i + 2, QString(value(var)).replace('\n', '\n' + QString(i - lastnewline - 1, QChar(' ')))); 148 149 } 150 151 152 } 153 154 return output; 155} 156