Aegisub/aegisub/libaegisub/common/option_visit.cpp

169 lines
4.9 KiB
C++

// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// $Id$
/// @file option_visit.cpp
/// @brief Cajun JSON visitor to load config values.
/// @see option_visit.h
/// @ingroup libaegisub
#include "../config.h"
#include "option_visit.h"
#ifndef LAGI_PRE
#include <cassert>
#include <cmath>
#endif
#include <libaegisub/colour.h>
#include <libaegisub/log.h>
#include <libaegisub/option_value.h>
#include <libaegisub/scoped_ptr.h>
namespace agi {
ConfigVisitor::ConfigVisitor(OptionValueMap &val, const std::string &member_name, bool ignore_errors, bool replace)
: values(val)
, name(member_name)
, ignore_errors(ignore_errors)
, replace(replace)
{
}
template<class ErrorType>
void ConfigVisitor::Error(const char *message) {
if (ignore_errors)
LOG_E("option/load/config_visitor") << "Error loading option from user configuration: " << message;
else
throw ErrorType(message);
}
void ConfigVisitor::Visit(const json::Object& object) {
json::Object::const_iterator index(object.begin()), index_end(object.end());
if (!name.empty())
name += "/";
for (; index != index_end; ++index) {
ConfigVisitor config_visitor(values, name + index->first, ignore_errors, replace);
index->second.Accept(config_visitor);
}
}
template<class OptionValueType, class ValueType>
OptionValue *ConfigVisitor::ReadArray(json::Array const& src, std::string const& array_type, void (OptionValueType::*)(const std::vector<ValueType>&)) {
std::vector<ValueType> arr;
arr.reserve(src.size());
for (json::Array::const_iterator it = src.begin(); it != src.end(); ++it) {
json::Object const& obj = *it;
if (obj.size() != 1) {
Error<OptionJsonValueArray>("Invalid array member");
return 0;
}
if (obj.begin()->first != array_type) {
Error<OptionJsonValueArray>("Attempt to insert value into array of wrong type");
return 0;
}
arr.push_back(obj.begin()->second);
}
return new OptionValueType(name, arr);
}
void ConfigVisitor::Visit(const json::Array& array) {
if (array.empty()) {
Error<OptionJsonValueArray>("Cannot infer the type of an empty array");
return;
}
json::Object const& front = array.front();
if (front.size() != 1) {
Error<OptionJsonValueArray>("Invalid array member");
return;
}
const std::string& array_type = front.begin()->first;
if (array_type == "string")
AddOptionValue(ReadArray(array, array_type, &OptionValueListString::SetListString));
else if (array_type == "int")
AddOptionValue(ReadArray(array, array_type, &OptionValueListInt::SetListInt));
else if (array_type == "double")
AddOptionValue(ReadArray(array, array_type, &OptionValueListDouble::SetListDouble));
else if (array_type == "bool")
AddOptionValue(ReadArray(array, array_type, &OptionValueListBool::SetListBool));
else if (array_type == "colour")
AddOptionValue(ReadArray(array, array_type, &OptionValueListColour::SetListColour));
else
Error<OptionJsonValueArray>("Array type not handled");
}
void ConfigVisitor::Visit(const json::Integer& number) {
AddOptionValue(new OptionValueInt(name, number));
}
void ConfigVisitor::Visit(const json::Double& number) {
AddOptionValue(new OptionValueDouble(name, number));
}
void ConfigVisitor::Visit(const json::String& string) {
if (string.find("rgb(") == 0) {
AddOptionValue(new OptionValueColour(name, string));
} else {
AddOptionValue(new OptionValueString(name, string));
}
}
void ConfigVisitor::Visit(const json::Boolean& boolean) {
AddOptionValue(new OptionValueBool(name, boolean));
}
void ConfigVisitor::Visit(const json::Null& null) {
Error<OptionJsonValueNull>("Attempt to read null value");
}
void ConfigVisitor::AddOptionValue(OptionValue* opt) {
if (!opt) {
assert(ignore_errors);
return;
}
if (!values.count(name))
values[name] = opt;
else if (replace) {
delete values[name];
values[name] = opt;
}
else {
try {
// Ensure than opt is deleted at the end of this function even if the Set
// method throws
agi::scoped_ptr<OptionValue> auto_opt(opt);
values[name]->Set(opt);
}
catch (agi::OptionValueError const& e) {
if (ignore_errors)
LOG_E("option/load/config_visitor") << "Error loading option from user configuration: " << e.GetChainedMessage();
else
throw;
}
}
}
} // namespace agi