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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "ParameterizedStringParser.h"
#include <utility>
#include "DlAbortEx.h"
#include "util.h"
#include "PStringSegment.h"
#include "PStringSelect.h"
#include "PStringNumLoop.h"
#include "NumberDecorator.h"
#include "FixedWidthNumberDecorator.h"
#include "AlphaNumberDecorator.h"
namespace aria2 {
SharedHandle<PStringDatum>
ParameterizedStringParser::parse(const std::string& src)
{
int offset = 0;
return diggPString(src, offset);
}
SharedHandle<PStringDatum>
ParameterizedStringParser::diggPString(const std::string& src, int& offset)
{
if(src.size() == (size_t)offset) {
return SharedHandle<PStringDatum>();
}
switch(src[offset]) {
case '[':
return createLoop(src, offset);
case '{':
return createSelect(src, offset);
default:
return createSegment(src, offset);
}
}
SharedHandle<PStringDatum>
ParameterizedStringParser::createSegment(const std::string& src, int& offset)
{
std::string::size_type nextDelimiterIndex = src.find_first_of("[{", offset);
if(nextDelimiterIndex == std::string::npos) {
nextDelimiterIndex = src.size();
}
std::string value = src.substr(offset, nextDelimiterIndex-offset);
offset = nextDelimiterIndex;
SharedHandle<PStringDatum> next = diggPString(src, offset);
return SharedHandle<PStringDatum>(new PStringSegment(value, next));
}
SharedHandle<PStringDatum>
ParameterizedStringParser::createSelect(const std::string& src, int& offset)
{
++offset;
std::string::size_type rightParenIndex = src.find("}", offset);
if(rightParenIndex == std::string::npos) {
throw DL_ABORT_EX("Missing '}' in the parameterized string.");
}
std::vector<std::string> values;
util::split(src.substr(offset, rightParenIndex-offset),
std::back_inserter(values), ",", true);
if(values.empty()) {
throw DL_ABORT_EX("Empty {} is not allowed.");
}
offset = rightParenIndex+1;
SharedHandle<PStringDatum> next = diggPString(src, offset);
return SharedHandle<PStringDatum>(new PStringSelect(values, next));
}
SharedHandle<PStringDatum>
ParameterizedStringParser::createLoop(const std::string& src, int& offset)
{
++offset;
std::string::size_type rightParenIndex = src.find("]", offset);
if(rightParenIndex == std::string::npos) {
throw DL_ABORT_EX("Missing ']' in the parameterized string.");
}
std::string loopStr = src.substr(offset, rightParenIndex-offset);
offset = rightParenIndex+1;
unsigned int step = 1;
std::string::size_type colonIndex = loopStr.find(":");
if(colonIndex != std::string::npos) {
std::string stepStr = loopStr.substr(colonIndex+1);
if(util::isNumber(stepStr)) {
step = util::parseUInt(stepStr);
} else {
throw DL_ABORT_EX("A step count must be a positive number.");
}
loopStr.erase(colonIndex);
}
std::pair<std::string, std::string> range = util::split(loopStr, "-");
if(range.first.empty() || range.second.empty()) {
throw DL_ABORT_EX("Loop range missing.");
}
SharedHandle<NumberDecorator> nd;
unsigned int start;
unsigned int end;
if(util::isNumber(range.first) && util::isNumber(range.second)) {
nd.reset(new FixedWidthNumberDecorator(range.first.size()));
start = util::parseUInt(range.first);
end = util::parseUInt(range.second);
} else if(util::isLowercase(range.first) && util::isLowercase(range.second)) {
nd.reset(new AlphaNumberDecorator(range.first.size()));
start = util::alphaToNum(range.first);
end = util::alphaToNum(range.second);
} else if(util::isUppercase(range.first) && util::isUppercase(range.second)) {
nd.reset(new AlphaNumberDecorator(range.first.size(), true));
start = util::alphaToNum(range.first);
end = util::alphaToNum(range.second);
} else {
throw DL_ABORT_EX("Invalid loop range.");
}
SharedHandle<PStringDatum> next(diggPString(src, offset));
return SharedHandle<PStringDatum>(new PStringNumLoop(start, end, step, nd, next));
}
} // namespace aria2
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