Cutelee  6.1.0
widthratio.cpp
1 /*
2  This file is part of the Cutelee template system.
3 
4  Copyright (c) 2009,2010 Stephen Kelly <steveire@gmail.com>
5 
6  This library is free software; you can redistribute it and/or
7  modify it under the terms of the GNU Lesser General Public
8  License as published by the Free Software Foundation; either version
9  2.1 of the Licence, or (at your option) any later version.
10 
11  This library is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  Lesser General Public License for more details.
15 
16  You should have received a copy of the GNU Lesser General Public
17  License along with this library. If not, see <http://www.gnu.org/licenses/>.
18 
19 */
20 
21 #include "widthratio.h"
22 
23 #include "../lib/exception.h"
24 #include "parser.h"
25 
26 WidthRatioNodeFactory::WidthRatioNodeFactory() {}
27 
28 Node *WidthRatioNodeFactory::getNode(const QString &tagContent, Parser *p) const
29 {
30  auto expr = smartSplit(tagContent);
31 
32  if (expr.size() != 4) {
33  throw Cutelee::Exception(
34  TagSyntaxError, QStringLiteral("widthratio takes three arguments"));
35  }
36  FilterExpression valExpr(expr.at(1), p);
37  FilterExpression maxExpr(expr.at(2), p);
38  FilterExpression maxWidth(expr.at(3), p);
39 
40  return new WidthRatioNode(valExpr, maxExpr, maxWidth, p);
41 }
42 
43 WidthRatioNode::WidthRatioNode(const FilterExpression &valExpr,
44  const FilterExpression &maxExpr,
45  const FilterExpression &maxWidth,
46  QObject *parent)
47  : Node(parent)
48 {
49  m_valExpr = valExpr;
50  m_maxExpr = maxExpr;
51  m_maxWidth = maxWidth;
52 }
53 
54 int WidthRatioNode::round(qreal number)
55 {
56  auto intPart = (int)number;
57  if (number < (intPart + 0.5))
58  return intPart;
59  return intPart + 1;
60 }
61 
63 {
64  auto thisVal = m_valExpr.resolve(c);
65  auto maxVal = m_maxExpr.resolve(c);
66  if (!thisVal.isValid() || !maxVal.isValid())
67  return;
68 
69  auto tv = thisVal.value<double>();
70  auto mv = maxVal.value<double>();
71 
72  if (mv == 0)
73  return;
74 
75  auto maxWidth = m_maxWidth.resolve(c).value<int>();
76 
77  auto result = (tv / mv) * maxWidth;
78 
79  result = round(result);
80 
81  // TODO put integral streamers in OutputStream?
82  (*stream) << QString::number(result);
83 }
Q_INVOKABLE QStringList smartSplit(const QString &str) const
Definition: node.cpp:202
The Context class holds the context to render a Template with.
Definition: context.h:119
An exception for use when implementing template tags.
Definition: exception.h:85
A FilterExpression object represents a filter expression in a template.
QVariant resolve(OutputStream *stream, Context *c) const
Base class for all nodes.
Definition: node.h:78
The OutputStream class is used to render templates to a QTextStream.
Definition: outputstream.h:81
The Parser class processes a string template into a tree of nodes.
Definition: parser.h:49
Node * getNode(const QString &tagContent, Parser *p) const override
Definition: widthratio.cpp:28
void render(OutputStream *stream, Context *c) const override
Definition: widthratio.cpp:62