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+// Copyright 2012 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+// notice, this list of conditions and the following disclaimer in the
+// documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+// may be used to endorse or promote products derived from this software
+// without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "utils/config/nodes.ipp"
+
+#include <memory>
+
+#include <lutok/state.ipp>
+
+#include "utils/config/exceptions.hpp"
+#include "utils/config/keys.hpp"
+#include "utils/format/macros.hpp"
+
+namespace config = utils::config;
+
+
+/// Destructor.
+config::detail::base_node::~base_node(void)
+{
+}
+
+
+/// Constructor.
+///
+/// \param dynamic_ Whether the node is dynamic or not.
+config::detail::inner_node::inner_node(const bool dynamic_) :
+ _dynamic(dynamic_)
+{
+}
+
+
+/// Destructor.
+config::detail::inner_node::~inner_node(void)
+{
+ for (children_map::const_iterator iter = _children.begin();
+ iter != _children.end(); ++iter)
+ delete (*iter).second;
+}
+
+
+/// Fills the given node with a copy of this node's data.
+///
+/// \param node The node to fill. Should be the fresh return value of a
+/// deep_copy() operation.
+void
+config::detail::inner_node::copy_into(inner_node* node) const
+{
+ node->_dynamic = _dynamic;
+ for (children_map::const_iterator iter = _children.begin();
+ iter != _children.end(); ++iter) {
+ base_node* new_node = (*iter).second->deep_copy();
+ try {
+ node->_children[(*iter).first] = new_node;
+ } catch (...) {
+ delete new_node;
+ throw;
+ }
+ }
+}
+
+
+/// Combines two children sets, preferring the keys in the first set only.
+///
+/// This operation is not symmetrical on c1 and c2. The caller is responsible
+/// for invoking this twice so that the two key sets are combined if they happen
+/// to differ.
+///
+/// \param key Key to this node.
+/// \param c1 First children set.
+/// \param c2 First children set.
+/// \param [in,out] node The node to combine into.
+///
+/// \throw bad_combination_error If the two nodes cannot be combined.
+void
+config::detail::inner_node::combine_children_into(
+ const tree_key& key,
+ const children_map& c1, const children_map& c2,
+ inner_node* node) const
+{
+ for (children_map::const_iterator iter1 = c1.begin();
+ iter1 != c1.end(); ++iter1) {
+ const std::string& name = (*iter1).first;
+
+ if (node->_children.find(name) != node->_children.end()) {
+ continue;
+ }
+
+ std::auto_ptr< base_node > new_node;
+
+ children_map::const_iterator iter2 = c2.find(name);
+ if (iter2 == c2.end()) {
+ new_node.reset((*iter1).second->deep_copy());
+ } else {
+ tree_key child_key = key;
+ child_key.push_back(name);
+ new_node.reset((*iter1).second->combine(child_key,
+ (*iter2).second));
+ }
+
+ node->_children[name] = new_node.release();
+ }
+}
+
+
+/// Combines this inner node with another inner node onto a new node.
+///
+/// The "dynamic" property is inherited by the new node if either of the two
+/// nodes are dynamic.
+///
+/// \param key Key to this node.
+/// \param other_base The node to combine with.
+/// \param [in,out] node The node to combine into.
+///
+/// \throw bad_combination_error If the two nodes cannot be combined.
+void
+config::detail::inner_node::combine_into(const tree_key& key,
+ const base_node* other_base,
+ inner_node* node) const
+{
+ try {
+ const inner_node& other = dynamic_cast< const inner_node& >(
+ *other_base);
+
+ node->_dynamic = _dynamic || other._dynamic;
+
+ combine_children_into(key, _children, other._children, node);
+ combine_children_into(key, other._children, _children, node);
+ } catch (const std::bad_cast& unused_e) {
+ throw config::bad_combination_error(
+ key, "'%s' is an inner node in the base tree but a leaf node in "
+ "the overrides treee");
+ }
+}
+
+
+/// Finds a node without creating it if not found.
+///
+/// This recursive algorithm traverses the tree searching for a particular key.
+/// The returned node is constant, so this can only be used for querying
+/// purposes. For this reason, this algorithm does not create intermediate
+/// nodes if they don't exist (as would be necessary to set a new node).
+///
+/// \param key The key to be queried.
+/// \param key_pos The current level within the key to be examined.
+///
+/// \return A reference to the located node, if successful.
+///
+/// \throw unknown_key_error If the provided key is unknown.
+const config::detail::base_node*
+config::detail::inner_node::lookup_ro(const tree_key& key,
+ const tree_key::size_type key_pos) const
+{
+ PRE(key_pos < key.size());
+
+ const children_map::const_iterator child_iter = _children.find(
+ key[key_pos]);
+ if (child_iter == _children.end())
+ throw unknown_key_error(key);
+
+ if (key_pos == key.size() - 1) {
+ return (*child_iter).second;
+ } else {
+ PRE(key_pos < key.size() - 1);
+ try {
+ const inner_node& child = dynamic_cast< const inner_node& >(
+ *(*child_iter).second);
+ return child.lookup_ro(key, key_pos + 1);
+ } catch (const std::bad_cast& e) {
+ throw unknown_key_error(
+ key, "Cannot address incomplete configuration property '%s'");
+ }
+ }
+}
+
+
+/// Finds a node and creates it if not found.
+///
+/// This recursive algorithm traverses the tree searching for a particular key,
+/// creating any intermediate nodes if they do not already exist (for the case
+/// of dynamic inner nodes). The returned node is non-constant, so this can be
+/// used by the algorithms that set key values.
+///
+/// \param key The key to be queried.
+/// \param key_pos The current level within the key to be examined.
+/// \param new_node A function that returns a new leaf node of the desired
+/// type. This is only called if the leaf cannot be found, but it has
+/// already been defined.
+///
+/// \return A reference to the located node, if successful.
+///
+/// \throw invalid_key_value If the resulting node of the search would be an
+/// inner node.
+/// \throw unknown_key_error If the provided key is unknown.
+config::leaf_node*
+config::detail::inner_node::lookup_rw(const tree_key& key,
+ const tree_key::size_type key_pos,
+ new_node_hook new_node)
+{
+ PRE(key_pos < key.size());
+
+ children_map::const_iterator child_iter = _children.find(key[key_pos]);
+ if (child_iter == _children.end()) {
+ if (_dynamic) {
+ base_node* const child = (key_pos == key.size() - 1) ?
+ static_cast< base_node* >(new_node()) :
+ static_cast< base_node* >(new dynamic_inner_node());
+ _children.insert(children_map::value_type(key[key_pos], child));
+ child_iter = _children.find(key[key_pos]);
+ } else {
+ throw unknown_key_error(key);
+ }
+ }
+
+ if (key_pos == key.size() - 1) {
+ try {
+ leaf_node& child = dynamic_cast< leaf_node& >(
+ *(*child_iter).second);
+ return &child;
+ } catch (const std::bad_cast& unused_error) {
+ throw invalid_key_value(key, "Type mismatch");
+ }
+ } else {
+ PRE(key_pos < key.size() - 1);
+ try {
+ inner_node& child = dynamic_cast< inner_node& >(
+ *(*child_iter).second);
+ return child.lookup_rw(key, key_pos + 1, new_node);
+ } catch (const std::bad_cast& e) {
+ throw unknown_key_error(
+ key, "Cannot address incomplete configuration property '%s'");
+ }
+ }
+}
+
+
+/// Converts the subtree to a collection of key/value string pairs.
+///
+/// \param [out] properties The accumulator for the generated properties. The
+/// contents of the map are only extended.
+/// \param key The path to the current node.
+void
+config::detail::inner_node::all_properties(properties_map& properties,
+ const tree_key& key) const
+{
+ for (children_map::const_iterator iter = _children.begin();
+ iter != _children.end(); ++iter) {
+ tree_key child_key = key;
+ child_key.push_back((*iter).first);
+ try {
+ leaf_node& child = dynamic_cast< leaf_node& >(*(*iter).second);
+ if (child.is_set())
+ properties[flatten_key(child_key)] = child.to_string();
+ } catch (const std::bad_cast& unused_error) {
+ inner_node& child = dynamic_cast< inner_node& >(*(*iter).second);
+ child.all_properties(properties, child_key);
+ }
+ }
+}
+
+
+/// Constructor.
+config::detail::static_inner_node::static_inner_node(void) :
+ inner_node(false)
+{
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::detail::static_inner_node::deep_copy(void) const
+{
+ std::auto_ptr< inner_node > new_node(new static_inner_node());
+ copy_into(new_node.get());
+ return new_node.release();
+}
+
+
+/// Combines this node with another one.
+///
+/// \param key Key to this node.
+/// \param other The node to combine with.
+///
+/// \return A new node representing the combination.
+///
+/// \throw bad_combination_error If the two nodes cannot be combined.
+config::detail::base_node*
+config::detail::static_inner_node::combine(const tree_key& key,
+ const base_node* other) const
+{
+ std::auto_ptr< inner_node > new_node(new static_inner_node());
+ combine_into(key, other, new_node.get());
+ return new_node.release();
+}
+
+
+/// Registers a key as valid and having a specific type.
+///
+/// This method does not raise errors on invalid/unknown keys or other
+/// tree-related issues. The reasons is that define() is a method that does not
+/// depend on user input: it is intended to pre-populate the tree with a
+/// specific structure, and that happens once at coding time.
+///
+/// \param key The key to be registered.
+/// \param key_pos The current level within the key to be examined.
+/// \param new_node A function that returns a new leaf node of the desired
+/// type.
+void
+config::detail::static_inner_node::define(const tree_key& key,
+ const tree_key::size_type key_pos,
+ new_node_hook new_node)
+{
+ PRE(key_pos < key.size());
+
+ if (key_pos == key.size() - 1) {
+ PRE_MSG(_children.find(key[key_pos]) == _children.end(),
+ "Key already defined");
+ _children.insert(children_map::value_type(key[key_pos], new_node()));
+ } else {
+ PRE(key_pos < key.size() - 1);
+ const children_map::const_iterator child_iter = _children.find(
+ key[key_pos]);
+
+ if (child_iter == _children.end()) {
+ static_inner_node* const child_ptr = new static_inner_node();
+ _children.insert(children_map::value_type(key[key_pos], child_ptr));
+ child_ptr->define(key, key_pos + 1, new_node);
+ } else {
+ try {
+ static_inner_node& child = dynamic_cast< static_inner_node& >(
+ *(*child_iter).second);
+ child.define(key, key_pos + 1, new_node);
+ } catch (const std::bad_cast& e) {
+ UNREACHABLE;
+ }
+ }
+ }
+}
+
+
+/// Constructor.
+config::detail::dynamic_inner_node::dynamic_inner_node(void) :
+ inner_node(true)
+{
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::detail::dynamic_inner_node::deep_copy(void) const
+{
+ std::auto_ptr< inner_node > new_node(new dynamic_inner_node());
+ copy_into(new_node.get());
+ return new_node.release();
+}
+
+
+/// Combines this node with another one.
+///
+/// \param key Key to this node.
+/// \param other The node to combine with.
+///
+/// \return A new node representing the combination.
+///
+/// \throw bad_combination_error If the two nodes cannot be combined.
+config::detail::base_node*
+config::detail::dynamic_inner_node::combine(const tree_key& key,
+ const base_node* other) const
+{
+ std::auto_ptr< inner_node > new_node(new dynamic_inner_node());
+ combine_into(key, other, new_node.get());
+ return new_node.release();
+}
+
+
+/// Destructor.
+config::leaf_node::~leaf_node(void)
+{
+}
+
+
+/// Combines this node with another one.
+///
+/// \param key Key to this node.
+/// \param other_base The node to combine with.
+///
+/// \return A new node representing the combination.
+///
+/// \throw bad_combination_error If the two nodes cannot be combined.
+config::detail::base_node*
+config::leaf_node::combine(const detail::tree_key& key,
+ const base_node* other_base) const
+{
+ try {
+ const leaf_node& other = dynamic_cast< const leaf_node& >(*other_base);
+
+ if (other.is_set()) {
+ return other.deep_copy();
+ } else {
+ return deep_copy();
+ }
+ } catch (const std::bad_cast& unused_e) {
+ throw config::bad_combination_error(
+ key, "'%s' is a leaf node in the base tree but an inner node in "
+ "the overrides treee");
+ }
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::bool_node::deep_copy(void) const
+{
+ std::auto_ptr< bool_node > new_node(new bool_node());
+ new_node->_value = _value;
+ return new_node.release();
+}
+
+
+/// Pushes the node's value onto the Lua stack.
+///
+/// \param state The Lua state onto which to push the value.
+void
+config::bool_node::push_lua(lutok::state& state) const
+{
+ state.push_boolean(value());
+}
+
+
+/// Sets the value of the node from an entry in the Lua stack.
+///
+/// \param state The Lua state from which to get the value.
+/// \param value_index The stack index in which the value resides.
+///
+/// \throw value_error If the value in state(value_index) cannot be
+/// processed by this node.
+void
+config::bool_node::set_lua(lutok::state& state, const int value_index)
+{
+ if (state.is_boolean(value_index))
+ set(state.to_boolean(value_index));
+ else
+ throw value_error("Not a boolean");
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::int_node::deep_copy(void) const
+{
+ std::auto_ptr< int_node > new_node(new int_node());
+ new_node->_value = _value;
+ return new_node.release();
+}
+
+
+/// Pushes the node's value onto the Lua stack.
+///
+/// \param state The Lua state onto which to push the value.
+void
+config::int_node::push_lua(lutok::state& state) const
+{
+ state.push_integer(value());
+}
+
+
+/// Sets the value of the node from an entry in the Lua stack.
+///
+/// \param state The Lua state from which to get the value.
+/// \param value_index The stack index in which the value resides.
+///
+/// \throw value_error If the value in state(value_index) cannot be
+/// processed by this node.
+void
+config::int_node::set_lua(lutok::state& state, const int value_index)
+{
+ if (state.is_number(value_index))
+ set(state.to_integer(value_index));
+ else
+ throw value_error("Not an integer");
+}
+
+
+/// Checks a given value for validity.
+///
+/// \param new_value The value to validate.
+///
+/// \throw value_error If the value is not valid.
+void
+config::positive_int_node::validate(const value_type& new_value) const
+{
+ if (new_value <= 0)
+ throw value_error("Must be a positive integer");
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::string_node::deep_copy(void) const
+{
+ std::auto_ptr< string_node > new_node(new string_node());
+ new_node->_value = _value;
+ return new_node.release();
+}
+
+
+/// Pushes the node's value onto the Lua stack.
+///
+/// \param state The Lua state onto which to push the value.
+void
+config::string_node::push_lua(lutok::state& state) const
+{
+ state.push_string(value());
+}
+
+
+/// Sets the value of the node from an entry in the Lua stack.
+///
+/// \param state The Lua state from which to get the value.
+/// \param value_index The stack index in which the value resides.
+///
+/// \throw value_error If the value in state(value_index) cannot be
+/// processed by this node.
+void
+config::string_node::set_lua(lutok::state& state, const int value_index)
+{
+ if (state.is_string(value_index))
+ set(state.to_string(value_index));
+ else
+ throw value_error("Not a string");
+}
+
+
+/// Copies the node.
+///
+/// \return A dynamically-allocated node.
+config::detail::base_node*
+config::strings_set_node::deep_copy(void) const
+{
+ std::auto_ptr< strings_set_node > new_node(new strings_set_node());
+ new_node->_value = _value;
+ return new_node.release();
+}
+
+
+/// Converts a single word to the native type.
+///
+/// \param raw_value The value to parse.
+///
+/// \return The parsed value.
+std::string
+config::strings_set_node::parse_one(const std::string& raw_value) const
+{
+ return raw_value;
+}
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