Revision 01158b1ce1b225f46caad4bc9d321e4e6a14d8fa authored by Thomas Fischer on 07 December 2020, 10:50:49 UTC, committed by Thomas Fischer on 07 December 2020, 10:50:49 UTC
1 parent e087193
ConfigTree.cpp
/**
* \file
* \copyright
* Copyright (c) 2012-2020, OpenGeoSys Community (http://www.opengeosys.org)
* Distributed under a Modified BSD License.
* See accompanying file LICENSE.txt or
* http://www.opengeosys.org/project/license
*
*/
#include "ConfigTree.h"
#include <forward_list>
#include <utility>
#include "Logging.h"
#include "Error.h"
// Explicitly instantiate the boost::property_tree::ptree which is a typedef to
// the following basic_ptree.
template class boost::property_tree::basic_ptree<std::string, std::string,
std::less<>>;
//! Collects swallowed error messages raised by the check during destruction of
//! ConfigTree instances.
static std::forward_list<std::string> configtree_destructor_error_messages;
namespace BaseLib
{
const char ConfigTree::pathseparator = '/';
const std::string ConfigTree::key_chars_start = "abcdefghijklmnopqrstuvwxyz";
const std::string ConfigTree::key_chars = key_chars_start + "_0123456789";
ConfigTree::ConfigTree(PTree const& tree,
std::string filename,
Callback error_cb,
Callback warning_cb)
: _tree(&tree),
_filename(std::move(filename)),
_onerror(std::move(error_cb)),
_onwarning(std::move(warning_cb))
{
if (!_onerror) {
OGS_FATAL("ConfigTree: No valid error handler provided.");
}
if (!_onwarning) {
OGS_FATAL("ConfigTree: No valid warning handler provided.");
}
}
ConfigTree::
ConfigTree(PTree const& tree, ConfigTree const& parent,
std::string const& root)
: _tree(&tree), _path(joinPaths(parent._path, root)),
_filename(parent._filename),
_onerror(parent._onerror), _onwarning(parent._onwarning)
{
checkKeyname(root);
}
ConfigTree::
ConfigTree(ConfigTree && other)
: _tree (other._tree)
, _path (std::move(other._path))
, _filename (std::move(other._filename))
, _visited_params(std::move(other._visited_params))
, _have_read_data (other._have_read_data)
, _onerror (std::move(other._onerror))
, _onwarning (std::move(other._onwarning))
{
other._tree = nullptr;
}
ConfigTree::~ConfigTree()
{
if (std::uncaught_exceptions() > 0)
{
/* If the stack unwinds the check below shall be suppressed in order to
* not accumulate false-positive configuration errors.
*/
return;
}
try {
checkAndInvalidate();
} catch (std::exception& e) {
ERR("{:s}", e.what());
configtree_destructor_error_messages.push_front(e.what());
}
}
ConfigTree&
ConfigTree::
operator=(ConfigTree&& other)
{
checkAndInvalidate();
_tree = other._tree;
other._tree = nullptr;
_path = std::move(other._path);
_filename = std::move(other._filename);
_visited_params = std::move(other._visited_params);
_have_read_data = other._have_read_data;
_onerror = std::move(other._onerror);
_onwarning = std::move(other._onwarning);
return *this;
}
ConfigTree
ConfigTree::
getConfigParameter(std::string const& root) const
{
auto ct = getConfigSubtree(root);
if (ct.hasChildren())
{
error("Requested parameter <" + root + "> actually is a subtree.");
}
return ct;
}
boost::optional<ConfigTree>
ConfigTree::
getConfigParameterOptional(std::string const& root) const
{
auto ct = getConfigSubtreeOptional(root);
if (ct && ct->hasChildren())
{
error("Requested parameter <" + root + "> actually is a subtree.");
}
return ct;
}
Range<ConfigTree::ParameterIterator>
ConfigTree::
getConfigParameterList(const std::string ¶m) const
{
checkUnique(param);
markVisited(param, Attr::TAG, true);
auto p = _tree->equal_range(param);
return Range<ParameterIterator>(
ParameterIterator(p.first, param, *this),
ParameterIterator(p.second, param, *this));
}
ConfigTree
ConfigTree::
getConfigSubtree(std::string const& root) const
{
if (auto t = getConfigSubtreeOptional(root)) {
return std::move(*t);
}
error("Key <" + root + "> has not been found.");
}
boost::optional<ConfigTree>
ConfigTree::
getConfigSubtreeOptional(std::string const& root) const
{
checkUnique(root);
if (auto subtree = _tree->get_child_optional(root)) {
markVisited(root, Attr::TAG, false);
return ConfigTree(*subtree, *this, root);
}
markVisited(root, Attr::TAG, true);
return boost::none;
}
Range<ConfigTree::SubtreeIterator>
ConfigTree::
getConfigSubtreeList(std::string const& root) const
{
checkUnique(root);
markVisited(root, Attr::TAG, true);
auto p = _tree->equal_range(root);
return Range<SubtreeIterator>(
SubtreeIterator(p.first, root, *this),
SubtreeIterator(p.second, root, *this));
}
void ConfigTree::ignoreConfigParameter(const std::string ¶m) const
{
checkUnique(param);
// if not found, peek only
bool peek_only = _tree->find(param) == _tree->not_found();
markVisited(param, Attr::TAG, peek_only);
}
void ConfigTree::ignoreConfigAttribute(const std::string &attr) const
{
checkUniqueAttr(attr);
// Exercise: Guess what not! (hint: if not found, peek only)
// Btw. (not a hint) _tree->find() does not seem to work here.
bool peek_only = !_tree->get_child_optional("<xmlattr>." + attr);
markVisited(attr, Attr::ATTR, peek_only);
}
void ConfigTree::ignoreConfigParameterAll(const std::string ¶m) const
{
checkUnique(param);
auto& ct = markVisited(param, Attr::TAG, true);
auto p = _tree->equal_range(param);
for (auto it = p.first; it != p.second; ++it) {
++ct.count;
}
}
void ConfigTree::error(const std::string& message) const
{
_onerror(_filename, _path, message);
OGS_FATAL(
"ConfigTree: The error handler does not break out of the normal "
"control flow.");
}
void ConfigTree::warning(const std::string& message) const
{
_onwarning(_filename, _path, message);
}
void ConfigTree::onerror(const std::string& filename, const std::string& path,
const std::string& message)
{
OGS_FATAL("ConfigTree: In file `{:s}' at path <{:s}>: {:s}", filename, path,
message);
}
void ConfigTree::onwarning(const std::string& filename, const std::string& path,
const std::string& message)
{
WARN("ConfigTree: In file `{:s}' at path <{:s}>: {:s}", filename, path,
message);
}
void ConfigTree::assertNoSwallowedErrors()
{
if (configtree_destructor_error_messages.empty())
{
return;
}
ERR("ConfigTree: There have been errors when parsing the configuration "
"file(s):");
for (auto const& msg : configtree_destructor_error_messages) {
ERR("{:s}", msg);
}
OGS_FATAL("There have been errors when parsing the configuration file(s).");
}
std::string ConfigTree::shortString(const std::string &s)
{
const std::size_t maxlen = 100;
if (s.size() < maxlen)
{
return s;
}
return s.substr(0, maxlen-3) + "...";
}
void ConfigTree::checkKeyname(std::string const& key) const
{
if (key.empty()) {
error("Search for empty key.");
} else if (key_chars_start.find(key.front()) == std::string::npos) {
error("Key <" + key + "> starts with an illegal character.");
} else if (key.find_first_not_of(key_chars, 1) != std::string::npos) {
error("Key <" + key + "> contains illegal characters.");
} else if (key.find("__") != std::string::npos) {
// This is illegal because we use parameter names to generate doxygen
// page names. Thereby "__" acts as a separator character. Choosing
// other separators is not possible because of observed limitations
// for valid doxygen page names.
error("Key <" + key + "> contains double underscore.");
}
}
std::string ConfigTree::
joinPaths( const std::string &p1, const std::string &p2) const
{
if (p2.empty()) {
error("Second path to be joined is empty.");
}
if (p1.empty())
{
return p2;
}
return p1 + pathseparator + p2;
}
void ConfigTree::checkUnique(const std::string &key) const
{
checkKeyname(key);
if (_visited_params.find({Attr::TAG, key}) != _visited_params.end()) {
error("Key <" + key + "> has already been processed.");
}
}
void ConfigTree::checkUniqueAttr(const std::string &attr) const
{
// Workaround for handling attributes with xml namespaces and uppercase letters.
if (attr.find(':') != std::string::npos)
{
auto pos = decltype(std::string::npos){0};
// Replace colon and uppercase letters with an allowed character 'a'.
// That means, attributes containing a colon are also allowed to contain
// uppercase letters.
auto attr2 = attr;
do {
pos = attr2.find_first_of(":ABCDEFGHIJKLMNOPQRSTUVWXYZ", pos);
if (pos != std::string::npos)
{
attr2[pos] = 'a';
}
} while (pos != std::string::npos);
checkKeyname(attr2);
}
else
{
checkKeyname(attr);
}
if (_visited_params.find({Attr::ATTR, attr}) != _visited_params.end()) {
error("Attribute '" + attr + "' has already been processed.");
}
}
ConfigTree::CountType&
ConfigTree::
markVisited(std::string const& key, Attr const is_attr, bool const peek_only) const
{
return markVisited<ConfigTree>(key, is_attr, peek_only);
}
void
ConfigTree::
markVisitedDecrement(Attr const is_attr, std::string const& key) const
{
auto const type = std::type_index(typeid(nullptr));
auto p = _visited_params.emplace(std::make_pair(is_attr, key),
CountType{-1, type});
if (!p.second) { // no insertion happened
auto& v = p.first->second;
--v.count;
}
}
bool
ConfigTree::hasChildren() const
{
auto const& tree = *_tree;
if (tree.begin() == tree.end())
{
return false; // no children
}
if (tree.front().first == "<xmlattr>" && (++tree.begin()) == tree.end())
{
return false; // only attributes
}
return true;
}
void
ConfigTree::checkAndInvalidate()
{
if (!_tree)
{
return;
}
// Note: due to a limitation in boost::property_tree it is not possible
// to discriminate between <tag></tag> and <tag/> in the input file.
// In both cases data() will be empty.
if ((!_have_read_data) && !_tree->data().empty()) {
warning("The immediate data `" + shortString(_tree->data())
+"' of this tag has not been read.");
}
// iterate over children
for (auto const& p : *_tree) {
if (p.first != "<xmlattr>")
{ // attributes are handled below
markVisitedDecrement(Attr::TAG, p.first);
}
}
// iterate over attributes
if (auto attrs = _tree->get_child_optional("<xmlattr>")) {
for (auto const& p : *attrs) {
markVisitedDecrement(Attr::ATTR, p.first);
}
}
for (auto const& p : _visited_params)
{
auto const& tag = p.first.second;
auto const& count = p.second.count;
switch (p.first.first) {
case Attr::ATTR:
if (count > 0) {
warning("XML attribute '" + tag + "' has been read " +
std::to_string(count) +
" time(s) more than it was present in the "
"configuration tree.");
} else if (count < 0) {
warning("XML attribute '" + tag + "' has been read " +
std::to_string(-count) +
" time(s) less than it was present in the "
"configuration tree.");
}
break;
case Attr::TAG:
if (count > 0) {
warning("Key <" + tag + "> has been read " + std::to_string(count)
+ " time(s) more than it was present in the configuration tree.");
} else if (count < 0) {
warning("Key <" + tag + "> has been read " + std::to_string(-count)
+ " time(s) less than it was present in the configuration tree.");
}
}
}
// The following invalidates this instance, s.t. it can not be read from it anymore,
// but it also prevents double-checking.
_tree = nullptr;
}
void checkAndInvalidate(ConfigTree &conf)
{
conf.checkAndInvalidate();
}
void checkAndInvalidate(ConfigTree* const conf)
{
if (conf)
{
conf->checkAndInvalidate();
}
}
void checkAndInvalidate(std::unique_ptr<ConfigTree> const& conf)
{
if (conf)
{
conf->checkAndInvalidate();
}
}
} // namespace BaseLib
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