Wt examples  3.3.6
Public Member Functions | Private Member Functions | Private Attributes | List of all members
SourceView Class Reference

View class for source code. More...

#include <SourceView.h>

Inheritance diagram for SourceView:
Inheritance graph
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Public Member Functions

 SourceView (int fileNameRole, int contentRole, int filePathRole)
 Constructor. More...
 
virtual ~SourceView ()
 Destructor. More...
 
bool setIndex (const Wt::WModelIndex &index)
 Sets the model index. More...
 
virtual Wt::WWidget * renderView ()
 Returns the widget that renders the view. More...
 

Private Member Functions

std::string imageExtension (const std::string &fileName)
 

Private Attributes

Wt::WModelIndex index_
 The index that is currently displayed. More...
 
int fileNameRole_
 The role that is currently displayed. More...
 
int contentRole_
 
int filePathRole_
 
Wt::WMemoryResource * imageResource_
 

Detailed Description

View class for source code.

A view class is used so that no server-side memory is used while displaying a potentially large file.

Definition at line 26 of file SourceView.h.

Constructor & Destructor Documentation

§ SourceView()

SourceView::SourceView ( int  fileNameRole,
int  contentRole,
int  filePathRole 
)

Constructor.

The fileNameRole will be used to retrieve data from a file to be displayed. If no data is set for this role, then contentRole should hold the data as a string.

Definition at line 20 of file SourceView.C.

21  : fileNameRole_(fileNameRole),
22  contentRole_(contentRole),
23  filePathRole_(filePathRole),
25 {}
int contentRole_
Definition: SourceView.h:61
int fileNameRole_
The role that is currently displayed.
Definition: SourceView.h:60
int filePathRole_
Definition: SourceView.h:62
Wt::WMemoryResource * imageResource_
Definition: SourceView.h:64

§ ~SourceView()

SourceView::~SourceView ( )
virtual

Destructor.

Definition at line 27 of file SourceView.C.

28 { }

Member Function Documentation

§ imageExtension()

std::string SourceView::imageExtension ( const std::string &  fileName)
private

Definition at line 204 of file SourceView.C.

205 {
206  static const char *imageExtensions[] = {
207  ".png", ".gif", ".jpg", "jpeg", ".ico", 0
208  };
209 
210  fs::path p(fileName);
211  std::string extension = fs::extension(p);
212 
213  for (const char **s = imageExtensions; *s != 0; ++s)
214  if (*s == extension)
215  return extension.substr(1);
216 
217  return std::string();
218 }

§ renderView()

WWidget * SourceView::renderView ( )
virtual

Returns the widget that renders the view.

Returns he view contents: renders the file to a WText widget. WViewWidget deletes this widget after every rendering step.

Definition at line 95 of file SourceView.C.

96 {
97  if (!index_.isValid()) {
98  // no content
99  WText *result = new WText();
100  result->setInline(false);
101  return result;
102  }
103 
104  /*
105  * read the contents, from string or file name
106  */
107  boost::any contentsData = index_.data(contentRole_);
108  std::string content;
109  if (!contentsData.empty())
110  content = boost::any_cast<const std::string&>(contentsData);
111  boost::any fileNameData = index_.data(fileNameRole_);
112  std::string fileName =
113  boost::any_cast<const std::string&>(fileNameData);
114  boost::any filePathData = index_.data(filePathRole_);
115  std::string filePath;
116  if (!filePathData.empty())
117  filePath = boost::any_cast<const std::string&>(filePathData);
118 
119  /*
120  * determine source language, for source highlight
121  */
122  std::string lang = getLanguageFromFileExtension(fileName);
123  if (content != "" && content.substr(0, 100).find("-*- C++ -*-")
124  != std::string::npos)
125  lang = "cpp";
126 
127  std::string outputFileName;
128 
129  if (lang != "") {
130  std::string inputFileName;
131 
132  if (!filePathData.empty())
133  inputFileName = filePath;
134  else {
135  inputFileName = tempFileName();
136  std::ofstream out(inputFileName.c_str(),
137  std::ios::out | std::ios::binary);
138  out.write(content.c_str(), (std::streamsize)content.length());
139  out.close();
140  }
141 
142  outputFileName = tempFileName();
143 
144  std::string sourceHighlightCommand = "source-highlight ";
145  sourceHighlightCommand += "--src-lang=" + lang + " ";
146  sourceHighlightCommand += "--out-format=xhtml ";
147  sourceHighlightCommand += "--input=" + inputFileName + " ";
148  sourceHighlightCommand += "--output=" + outputFileName + " ";
149 
150  std::cerr << sourceHighlightCommand << std::endl;
151  bool sourceHighlightOk = system(sourceHighlightCommand.c_str()) == 0;
152 
153  if (sourceHighlightOk)
154  content = readFileToString(outputFileName);
155  else {
156  content = readFileToString(inputFileName);
157  lang = "";
158  }
159  unlink(outputFileName.c_str());
160 
161  if (filePathData.empty())
162  unlink(inputFileName.c_str());
163  }
164 
165  if (content == "")
166  // do not load binary files, we would need to perform proper UTF-8
167  // transcoding to display them
168  if (!boost::iends_with(fileName, ".jar")
169  && !boost::iends_with(fileName, ".war")
170  && !boost::iends_with(fileName, ".class"))
171  content = readFileToString(fileName);
172 
173  delete imageResource_;
174  imageResource_ = 0;
175 
176  WWidget *result = 0;
177 
178  if (!imageExtension(fileName).empty()) {
179  WImage *image = new WImage();
180  imageResource_ = new WMemoryResource(this);
181  imageResource_->setMimeType("mime/" + imageExtension(fileName));
182  imageResource_->setData((const unsigned char*)content.data(),
183  (int)content.length());
184  image->setImageLink(imageResource_);
185  result = image;
186  } else if (lang != "") {
187  WText *text = new WText();
188  text->setTextFormat(XHTMLUnsafeText);
189  text->setText(WString::fromUTF8(content));
190  result = text;
191  } else {
192  WText *text = new WText();
193  text->setTextFormat(PlainText);
194  text->setText(WString::fromUTF8(content));
195  result = text;
196  }
197 
198  result->setInline(false);
199  WApplication::instance()
200  ->doJavaScript(result->jsRef() + ".parentNode.scrollTop = 0;");
201  return result;
202 }
int contentRole_
Definition: SourceView.h:61
int fileNameRole_
The role that is currently displayed.
Definition: SourceView.h:60
int filePathRole_
Definition: SourceView.h:62
std::string readFileToString(const std::string &fileName)
Definition: SourceView.C:83
std::string imageExtension(const std::string &fileName)
Definition: SourceView.C:204
Wt::WMemoryResource * imageResource_
Definition: SourceView.h:64
std::string getLanguageFromFileExtension(const std::string &fileName)
Definition: SourceView.C:63
Wt::WModelIndex index_
The index that is currently displayed.
Definition: SourceView.h:57
std::string tempFileName()
Definition: SourceView.C:48

§ setIndex()

bool SourceView::setIndex ( const Wt::WModelIndex &  index)

Sets the model index.

Returns true whether the view will be rerendered. The view will only be rerendered if the index contains new data.

Definition at line 30 of file SourceView.C.

31 {
32  if (index != index_ && index.isValid()) {
33  std::string fp = index.data(filePathRole_).empty() ? std::string()
34  : boost::any_cast<std::string>(index.data(filePathRole_));
35 
36  if (!index.data(contentRole_).empty()
37  || (!fp.empty() && !fs::is_directory(fp))) {
38  index_ = index;
39  update();
40 
41  return true;
42  }
43  }
44 
45  return false;
46 }
int contentRole_
Definition: SourceView.h:61
int filePathRole_
Definition: SourceView.h:62
Wt::WModelIndex index_
The index that is currently displayed.
Definition: SourceView.h:57

Member Data Documentation

§ contentRole_

int SourceView::contentRole_
private

Definition at line 61 of file SourceView.h.

§ fileNameRole_

int SourceView::fileNameRole_
private

The role that is currently displayed.

Definition at line 60 of file SourceView.h.

§ filePathRole_

int SourceView::filePathRole_
private

Definition at line 62 of file SourceView.h.

§ imageResource_

Wt::WMemoryResource* SourceView::imageResource_
private

Definition at line 64 of file SourceView.h.

§ index_

Wt::WModelIndex SourceView::index_
private

The index that is currently displayed.

Definition at line 57 of file SourceView.h.


The documentation for this class was generated from the following files:

Generated on Thu Jan 12 2017 for the C++ Web Toolkit (Wt) by doxygen 1.8.12