mirror of
https://github.com/ciphervance/supercell-wx.git
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373 lines
8.8 KiB
C++
373 lines
8.8 KiB
C++
#include <scwx/awips/text_product_message.hpp>
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#include <scwx/awips/wmo_header.hpp>
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#include <scwx/common/characters.hpp>
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#include <scwx/util/streams.hpp>
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#include <istream>
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#include <regex>
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#include <string>
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#include <boost/log/trivial.hpp>
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namespace scwx
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{
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namespace awips
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{
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static const std::string logPrefix_ = "[scwx::awips::text_product_message] ";
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// Issuance date/time takes one of the following forms:
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// * <hhmm>_xM_<tz>_day_mon_<dd>_year
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// * <hhmm>_UTC_day_mon_<dd>_year
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// Segment Header only:
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// * <hhmm>_xM_<tz1>_day_mon_<dd>_year_/<hhmm>_xM_<tz2>_day_mon_<dd>_year/
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// Look for hhmm (xM|UTC) to key the date/time string
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static const std::regex reDateTimeString {"^[0-9]{3,4} ([AP]M|UTC)"};
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struct Vtec
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{
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std::string pVtec_;
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std::string hVtec_;
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Vtec() : pVtec_ {}, hVtec_ {} {}
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Vtec(const Vtec&) = delete;
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Vtec& operator=(const Vtec&) = delete;
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Vtec(Vtec&&) noexcept = default;
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Vtec& operator=(Vtec&&) noexcept = default;
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};
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struct SegmentHeader
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{
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std::string ugcString_;
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std::vector<Vtec> vtecString_;
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std::vector<std::string> ugcNames_;
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std::string issuanceDateTime_;
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SegmentHeader() :
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ugcString_ {}, vtecString_ {}, ugcNames_ {}, issuanceDateTime_ {}
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{
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}
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SegmentHeader(const SegmentHeader&) = delete;
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SegmentHeader& operator=(const SegmentHeader&) = delete;
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SegmentHeader(SegmentHeader&&) noexcept = default;
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SegmentHeader& operator=(SegmentHeader&&) noexcept = default;
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};
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struct Segment
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{
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std::optional<SegmentHeader> header_;
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std::vector<std::string> productContent_;
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Segment() : header_ {}, productContent_ {} {}
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Segment(const Segment&) = delete;
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Segment& operator=(const Segment&) = delete;
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Segment(Segment&&) noexcept = default;
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Segment& operator=(Segment&&) noexcept = default;
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};
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static std::vector<std::string> ParseProductContent(std::istream& is);
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void SkipBlankLines(std::istream& is);
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bool TryParseEndOfProduct(std::istream& is);
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static std::vector<std::string> TryParseMndHeader(std::istream& is);
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static std::optional<SegmentHeader> TryParseSegmentHeader(std::istream& is);
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static std::optional<Vtec> TryParseVtecString(std::istream& is);
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class TextProductMessageImpl
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{
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public:
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explicit TextProductMessageImpl() : wmoHeader_ {} {}
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~TextProductMessageImpl() = default;
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std::shared_ptr<WmoHeader> wmoHeader_;
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std::vector<std::string> mndHeader_;
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std::vector<std::shared_ptr<Segment>> segments_;
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};
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TextProductMessage::TextProductMessage() :
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p(std::make_unique<TextProductMessageImpl>())
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{
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}
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TextProductMessage::~TextProductMessage() = default;
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TextProductMessage::TextProductMessage(TextProductMessage&&) noexcept = default;
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TextProductMessage&
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TextProductMessage::operator=(TextProductMessage&&) noexcept = default;
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size_t TextProductMessage::data_size() const
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{
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return 0;
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}
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bool TextProductMessage::Parse(std::istream& is)
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{
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bool dataValid = true;
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p->wmoHeader_ = std::make_shared<WmoHeader>();
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dataValid = p->wmoHeader_->Parse(is);
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for (size_t i = 0; dataValid && !is.eof(); i++)
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{
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if (i != 0 && TryParseEndOfProduct(is))
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{
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break;
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}
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std::shared_ptr<Segment> segment = std::make_shared<Segment>();
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if (i == 0)
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{
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if (is.peek() != '\r')
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{
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segment->header_ = TryParseSegmentHeader(is);
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}
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SkipBlankLines(is);
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p->mndHeader_ = TryParseMndHeader(is);
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SkipBlankLines(is);
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}
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if (!segment->header_.has_value())
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{
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segment->header_ = TryParseSegmentHeader(is);
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SkipBlankLines(is);
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}
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segment->productContent_ = ParseProductContent(is);
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SkipBlankLines(is);
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if (segment->header_.has_value() || !segment->productContent_.empty())
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{
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p->segments_.push_back(std::move(segment));
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}
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}
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return dataValid;
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}
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std::vector<std::string> ParseProductContent(std::istream& is)
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{
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std::vector<std::string> productContent;
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std::string line;
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while (!is.eof() && is.peek() != common::Characters::ETX)
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{
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util::getline(is, line);
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productContent.push_back(line);
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if (line.starts_with("$$"))
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{
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// End of Product or Product Segment Code
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break;
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}
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}
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while (!productContent.empty() && productContent.back().empty())
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{
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productContent.pop_back();
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}
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return productContent;
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}
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void SkipBlankLines(std::istream& is)
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{
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std::string line;
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while (is.peek() == '\r')
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{
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util::getline(is, line);
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}
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}
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bool TryParseEndOfProduct(std::istream& is)
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{
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std::string line;
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std::streampos isBegin = is.tellg();
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bool endOfStream = false;
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if (is.peek() == common::Characters::ETX)
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{
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is.get();
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endOfStream = true;
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}
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else if (is.peek() == EOF)
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{
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endOfStream = true;
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}
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if (!endOfStream)
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{
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// Optional Forecast Identifier
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util::getline(is, line);
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SkipBlankLines(is);
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if (is.peek() == common::Characters::ETX)
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{
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is.get();
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endOfStream = true;
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}
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else if (is.peek() == EOF)
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{
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endOfStream = true;
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}
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}
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if (!endOfStream)
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{
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// End of Product was not found, so reset the istream to the original
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// state
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is.seekg(isBegin, std::ios_base::beg);
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}
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return endOfStream;
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}
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std::vector<std::string> TryParseMndHeader(std::istream& is)
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{
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std::vector<std::string> mndHeader;
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std::string line;
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std::streampos isBegin = is.tellg();
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while (!is.eof() && is.peek() != '\r')
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{
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util::getline(is, line);
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mndHeader.push_back(line);
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}
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if (!mndHeader.empty() &&
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!std::regex_search(mndHeader.back(), reDateTimeString))
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{
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// MND Header should end with an Issuance Date/Time Line
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mndHeader.clear();
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}
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if (mndHeader.empty())
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{
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// MND header was not found, so reset the istream to the original state
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is.seekg(isBegin, std::ios_base::beg);
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}
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return mndHeader;
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}
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std::optional<SegmentHeader> TryParseSegmentHeader(std::istream& is)
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{
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// UGC takes the form SSFNNN-NNN>NNN-SSFNNN-DDHHMM- (NWSI 10-1702)
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// Look for SSF(NNN)?[->] to key the UGC string
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static const std::regex reUgcString {"^[A-Z]{2}[CZ]([0-9]{3})?[->]"};
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std::optional<SegmentHeader> header = std::nullopt;
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std::string line;
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std::streampos isBegin = is.tellg();
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util::getline(is, line);
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if (std::regex_search(line, reUgcString))
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{
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header = SegmentHeader();
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header->ugcString_.swap(line);
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}
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if (header.has_value())
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{
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std::optional<Vtec> vtec;
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while ((vtec = TryParseVtecString(is)) != std::nullopt)
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{
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header->vtecString_.push_back(std::move(*vtec));
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}
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while (!is.eof() && is.peek() != '\r')
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{
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util::getline(is, line);
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if (!std::regex_search(line, reDateTimeString))
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{
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header->ugcNames_.push_back(line);
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}
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else
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{
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header->issuanceDateTime_.swap(line);
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break;
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}
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}
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}
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if (!header.has_value())
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{
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// We did not find a valid segment header, so we reset the istream to the
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// original state
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is.seekg(isBegin, std::ios_base::beg);
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}
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return header;
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}
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std::optional<Vtec> TryParseVtecString(std::istream& is)
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{
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// P-VTEC takes the form /k.aaa.cccc.pp.s.####.yymmddThhnnZB-yymmddThhnnZE/
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// (NWSI 10-1703)
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// Look for /k. to key the P-VTEC string
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static const std::regex rePVtecString {"^/[OTEX]\\."};
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// H-VTEC takes the form
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// /nwsli.s.ic.yymmddThhnnZB.yymmddThhnnZC.yymmddThhnnZE.fr/ (NWSI 10-1703)
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// Look for /nwsli. to key the H-VTEC string
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static const std::regex reHVtecString {"^/[A-Z0-9]{5}\\."};
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std::optional<Vtec> vtec = std::nullopt;
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std::string line;
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std::streampos isBegin = is.tellg();
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util::getline(is, line);
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if (std::regex_search(line, rePVtecString))
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{
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vtec = Vtec();
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vtec->pVtec_.swap(line);
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isBegin = is.tellg();
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util::getline(is, line);
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if (std::regex_search(line, reHVtecString))
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{
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vtec->hVtec_.swap(line);
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}
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else
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{
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// H-VTEC was not found, so reset the istream to the beginning of the
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// line
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is.seekg(isBegin, std::ios_base::beg);
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}
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}
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else
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{
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// P-VTEC was not found, so reset the istream to the original state
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is.seekg(isBegin, std::ios_base::beg);
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}
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return vtec;
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}
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std::shared_ptr<TextProductMessage> TextProductMessage::Create(std::istream& is)
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{
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std::shared_ptr<TextProductMessage> message =
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std::make_shared<TextProductMessage>();
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if (!message->Parse(is))
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{
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message.reset();
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}
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return message;
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}
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} // namespace awips
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} // namespace scwx
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