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37 * Implements gmx::HelpManager.
39 * \author Teemu Murtola <teemu.murtola@gmail.com>
40 * \ingroup module_onlinehelp
44 #include "helpmanager.h"
49 #include "gromacs/onlinehelp/helptopicinterface.h"
50 #include "gromacs/utility/exceptions.h"
51 #include "gromacs/utility/stringutil.h"
56 /********************************************************************
61 * Private implementation class for HelpManager.
63 * \ingroup module_onlinehelp
65 class HelpManager::Impl
68 //! Container type for keeping the stack of active topics.
69 typedef std::vector<const HelpTopicInterface *> TopicStack;
71 //! Initializes a new manager with the given context.
72 explicit Impl(const HelpWriterContext &context)
73 : rootContext_(context)
77 //! Whether the active topic is the root topic.
78 bool isAtRootTopic() const { return topicStack_.size() == 1; }
79 //! Returns the active topic.
80 const HelpTopicInterface ¤tTopic() const
82 return *topicStack_.back();
84 //! Formats the active topic as a string, including its parent topics.
85 std::string currentTopicAsString() const;
87 //! Context with which the manager was initialized.
88 const HelpWriterContext &rootContext_;
90 * Stack of active topics.
92 * The first item is always the root topic, and each item is a subtopic
93 * of the preceding item. The last item is the currently active topic.
95 TopicStack topicStack_;
98 std::string HelpManager::Impl::currentTopicAsString() const
101 TopicStack::const_iterator topic;
102 for (topic = topicStack_.begin() + 1; topic != topicStack_.end(); ++topic)
108 result.append((*topic)->name());
113 /********************************************************************
117 HelpManager::HelpManager(const HelpTopicInterface &rootTopic,
118 const HelpWriterContext &context)
119 : impl_(new Impl(context))
121 impl_->topicStack_.push_back(&rootTopic);
124 HelpManager::~HelpManager()
128 void HelpManager::enterTopic(const char *name)
130 const HelpTopicInterface &topic = impl_->currentTopic();
131 if (!topic.hasSubTopics())
133 GMX_THROW(InvalidInputError(
134 formatString("Help topic '%s' has no subtopics",
135 impl_->currentTopicAsString().c_str())));
137 const HelpTopicInterface *newTopic = topic.findSubTopic(name);
138 if (newTopic == NULL)
140 if (impl_->isAtRootTopic())
142 GMX_THROW(InvalidInputError(
143 formatString("No help available for '%s'", name)));
147 GMX_THROW(InvalidInputError(
148 formatString("Help topic '%s' has no subtopic '%s'",
149 impl_->currentTopicAsString().c_str(), name)));
152 impl_->topicStack_.push_back(newTopic);
155 void HelpManager::enterTopic(const std::string &name)
157 enterTopic(name.c_str());
160 void HelpManager::writeCurrentTopic() const
162 const HelpTopicInterface &topic = impl_->currentTopic();
163 topic.writeHelp(impl_->rootContext_);