src/gromacs/onlinehelp/helpmanager.cpp

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  35 /*! \internal \file
  36  * \brief
  37  * Implements gmx::HelpManager.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \ingroup module_onlinehelp
  41  */
  42 #include "gmxpre.h"
  43
  44 #include "helpmanager.h"
  45
  46 #include <string>
  47 #include <vector>
  48
  49 #include "gromacs/onlinehelp/helpwritercontext.h"
  50 #include "gromacs/onlinehelp/ihelptopic.h"
  51 #include "gromacs/utility/exceptions.h"
  52 #include "gromacs/utility/stringutil.h"
  53
  54 namespace gmx
  55 {
  56
  57 /********************************************************************
  58  * HelpManager::Impl
  59  */
  60
  61 /*! \internal \brief
  62  * Private implementation class for HelpManager.
  63  *
  64  * \ingroup module_onlinehelp
  65  */
  66 class HelpManager::Impl
  67 {
  68 public:
  69     //! Container type for keeping the stack of active topics.
  70     typedef std::vector<const IHelpTopic*> TopicStack;
  71
  72     //! Initializes a new manager with the given context.
  73     explicit Impl(const HelpWriterContext& context) : rootContext_(context) {}
  74
  75     //! Whether the active topic is the root topic.
  76     bool isAtRootTopic() const { return topicStack_.size() == 1; }
  77     //! Returns the active topic.
  78     const IHelpTopic& currentTopic() const { return *topicStack_.back(); }
  79     //! Formats the active topic as a string, including its parent topics.
  80     std::string currentTopicAsString() const;
  81
  82     //! Context with which the manager was initialized.
  83     const HelpWriterContext& rootContext_;
  84     /*! \brief
  85      * Stack of active topics.
  86      *
  87      * The first item is always the root topic, and each item is a subtopic
  88      * of the preceding item.  The last item is the currently active topic.
  89      */
  90     TopicStack topicStack_;
  91 };
  92
  93 std::string HelpManager::Impl::currentTopicAsString() const
  94 {
  95     std::string                result;
  96     TopicStack::const_iterator topic;
  97     for (topic = topicStack_.begin() + 1; topic != topicStack_.end(); ++topic)
  98     {
  99         if (!result.empty())
 100         {
 101             result.append(" ");
 102         }
 103         result.append((*topic)->name());
 104     }
 105     return result;
 106 }
 107
 108 /********************************************************************
 109  * HelpManager
 110  */
 111
 112 HelpManager::HelpManager(const IHelpTopic& rootTopic, const HelpWriterContext& context) :
 113     impl_(new Impl(context))
 114 {
 115     impl_->topicStack_.push_back(&rootTopic);
 116 }
 117
 118 HelpManager::~HelpManager() {}
 119
 120 void HelpManager::enterTopic(const char* name)
 121 {
 122     const IHelpTopic& topic = impl_->currentTopic();
 123     if (!topic.hasSubTopics())
 124     {
 125         GMX_THROW(InvalidInputError(formatString("Help topic '%s' has no subtopics",
 126                                                  impl_->currentTopicAsString().c_str())));
 127     }
 128     const IHelpTopic* newTopic = topic.findSubTopic(name);
 129     if (newTopic == nullptr)
 130     {
 131         if (impl_->isAtRootTopic())
 132         {
 133             GMX_THROW(InvalidInputError(formatString("No help available for '%s'", name)));
 134         }
 135         else
 136         {
 137             GMX_THROW(InvalidInputError(formatString("Help topic '%s' has no subtopic '%s'",
 138                                                      impl_->currentTopicAsString().c_str(), name)));
 139         }
 140     }
 141     impl_->topicStack_.push_back(newTopic);
 142 }
 143
 144 void HelpManager::enterTopic(const std::string& name)
 145 {
 146     enterTopic(name.c_str());
 147 }
 148
 149 void HelpManager::writeCurrentTopic() const
 150 {
 151     const IHelpTopic& topic = impl_->currentTopic();
 152     const char*       title = topic.title();
 153     HelpWriterContext context(impl_->rootContext_);
 154     context.enterSubSection(title != nullptr ? title : "");
 155     topic.writeHelp(context);
 156 }
 157
 158 } // namespace gmx