/*=========================================================================

  Program:   CMake - Cross-Platform Makefile Generator
  Module:    $RCSfile$
  Language:  C++
  Date:      $Date$
  Version:   $Revision$

  Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#include "cmDocumentationFormatterHTML.h"
#include "cmDocumentationSection.h"

//----------------------------------------------------------------------------
static bool cmDocumentationIsHyperlinkChar(char c)
{
  // This is not a complete list but works for CMake documentation.
  return ((c >= 'A' && c <= 'Z') ||
          (c >= 'a' && c <= 'z') ||
          (c >= '0' && c <= '9') ||
          c == '-' || c == '.' || c == '/' || c == '~' || c == '@' ||
          c == ':' || c == '_' || c == '&' || c == '?' || c == '=');
}

//----------------------------------------------------------------------------
static void cmDocumentationPrintHTMLChar(std::ostream& os, char c)
{
  // Use an escape sequence if necessary.
  switch (c)
    {
    case '<': 
      os << "&lt;";
      break;
    case '>':
      os << "&gt;";
      break;
    case '&':
      os << "&amp;";
      break;
    case '\n':
      os << "<br>";
      break;
    default:
      os << c;
  }
}

//----------------------------------------------------------------------------
bool cmDocumentationHTMLIsIdChar(char c)
{
  // From the HTML specification:
  //   ID and NAME tokens must begin with a letter ([A-Za-z]) and may
  //   be followed by any number of letters, digits ([0-9]), hyphens
  //   ("-"), underscores ("_"), colons (":"), and periods (".").
  return ((c >= 'A' && c <= 'Z') ||
          (c >= 'a' && c <= 'z') ||
          (c >= '0' && c <= '9') ||
          c == '-' || c == '_' || c == ':' || c == '.');
}

//----------------------------------------------------------------------------
void cmDocumentationPrintHTMLId(std::ostream& os, const char* begin)
{
  for(const char* c = begin; *c; ++c)
    {
    if(cmDocumentationHTMLIsIdChar(*c))
      {
      os << *c;
      }
    }
}

//----------------------------------------------------------------------------
const char* cmDocumentationPrintHTMLLink(std::ostream& os, const char* begin)
{
  // Look for the end of the link.
  const char* end = begin;
  while(cmDocumentationIsHyperlinkChar(*end))
    {
    ++end;
    }

  // Print the hyperlink itself.
  os << "<a href=\"";
  for(const char* c = begin; c != end; ++c)
    {
    cmDocumentationPrintHTMLChar(os, *c);
    }
  os << "\">";

  // The name of the hyperlink is the text itself.
  for(const char* c = begin; c != end; ++c)
    {
    cmDocumentationPrintHTMLChar(os, *c);
    }
  os << "</a>";

  // Return the position at which to continue scanning the input
  // string.
  return end;
}


cmDocumentationFormatterHTML::cmDocumentationFormatterHTML()
:cmDocumentationFormatter()
{
}

void cmDocumentationFormatterHTML
::PrintSection(std::ostream& os,
               const cmDocumentationSection &section,
               const char* name)
{
  std::string prefix = this->ComputeSectionLinkPrefix(name);

  const std::vector<cmDocumentationEntry> &entries = 
    section.GetEntries();

  // skip the index if the help for only a single item (--help-command,
  // --help-policy, --help-property, --help-module) is printed
  bool isSingleItemHelp = ((name!=0) && (strcmp(name, "SingleItem")==0));

  if (!isSingleItemHelp)
    {
    if (name)
      {
      os << "<h2><a name=\"section_" << name << "\"/>" << name << "</h2>\n";
      }

    os << "<ul>\n";
    for(std::vector<cmDocumentationEntry>::const_iterator op 
         = entries.begin(); op != entries.end(); ++ op )
      {
      if(op->Name.size())
         {
         os << "    <li><a href=\"#" << prefix << ":";
         cmDocumentationPrintHTMLId(os, op->Name.c_str());
         os << "\"><b><code>";
         this->PrintHTMLEscapes(os, op->Name.c_str());
         os << "</code></b></a></li>";
         }
      }
    os << "</ul>\n" ;
    }

  for(std::vector<cmDocumentationEntry>::const_iterator op = entries.begin(); 
      op != entries.end();)
    {
    if(op->Name.size())
      {
      os << "<ul>\n";
      for(;op != entries.end() && op->Name.size(); ++op)
        {
        os << "  <li>\n";
        if(op->Name.size())
          {
          os << "    <a name=\"" << prefix << ":";
          cmDocumentationPrintHTMLId(os, op->Name.c_str());
          os << "\"><b><code>";
          this->PrintHTMLEscapes(os, op->Name.c_str());
          os << "</code></b></a>: ";
          }
        this->PrintHTMLEscapes(os, op->Brief.c_str());
        if(op->Full.size())
          {
          os << "<br>\n    ";
          this->PrintFormatted(os, op->Full.c_str());
          }
        os << "\n";
        os << "  </li>\n";
        }
      os << "</ul>\n";
      }
    else
      {
      this->PrintFormatted(os, op->Brief.c_str());
      os << "\n";
      ++op;
      }
    }
}

void cmDocumentationFormatterHTML::PrintPreformatted(std::ostream& os, 
                                                     const char* text)
{
  os << "<pre>";
  this->PrintHTMLEscapes(os, text);
  os << "</pre>\n    ";
}

void cmDocumentationFormatterHTML::PrintParagraph(std::ostream& os, 
                                                  const char* text)
{
  os << "<p>";
  this->PrintHTMLEscapes(os, text);
}

//----------------------------------------------------------------------------
void cmDocumentationFormatterHTML::PrintHeader(const char* /*name*/, 
                                               std::ostream& os)
{
  os << "<html><body>\n";
}

//----------------------------------------------------------------------------
void cmDocumentationFormatterHTML::PrintFooter(std::ostream& os)
{
  os << "</body></html>\n";
}

//----------------------------------------------------------------------------
void cmDocumentationFormatterHTML::PrintHTMLEscapes(std::ostream& os, 
                                                    const char* text)
{
  // Hyperlink prefixes.
  static const char* hyperlinks[] = {"http://", "ftp://", "mailto:", 0};

  // Print each character.
  for(const char* p = text; *p;)
    {
    // Handle hyperlinks specially to make them active.
    bool found_hyperlink = false;
    for(const char** h = hyperlinks; !found_hyperlink && *h; ++h)
      {
      if(strncmp(p, *h, strlen(*h)) == 0)
        {
        p = cmDocumentationPrintHTMLLink(os, p);
        found_hyperlink = true;
        }
      }

    // Print other characters normally.
    if(!found_hyperlink)
      {
      cmDocumentationPrintHTMLChar(os, *p++);
      }
    }
}

void cmDocumentationFormatterHTML
::PrintIndex(std::ostream& os,
             std::vector<const cmDocumentationSection *>& sections)
{
  // skip the index if only the help for a single item is printed
  if ((sections.size() == 1) 
       && (sections[0]->GetName(this->GetForm()) != 0 )
       && (std::string(sections[0]->GetName(this->GetForm())) == "SingleItem"))
    {
    return;
    }

  os << "<h2><a name=\"section_Index\"/>Master Index</h2>\n";
  os << "<ul>\n";
  for(unsigned int i=0; i < sections.size(); ++i)
    {
    std::string name = sections[i]->
      GetName((this->GetForm()));
    os << "  <li><a href=\"#section_" 
       << name << "\"<b>" << name << "</b></a></li>\n";
    }
  os << "</ul>\n";
}
