Initial commit; basic Apache log parsing

1 files changed, 96 insertions, 0 deletions

diff --git a/src/logTypes.cpp b/src/logTypes.cpp
new file mode 100644
index 0000000..42f0979
--- /dev/null
+++ b/src/logTypes.cpp
@@ -0,0 +1,96 @@
+#include "logTypes.hpp"
+
+namespace scn {
+	scan_expected<typename ContextType::iterator>
+	scanner<WebStat::QuotedString>::scan(WebStat::QuotedString & value, ContextType & ctx)
+	{
+		if (auto empty = scn::scan<>(ctx.range(), R"("")")) {
+			return empty->begin();
+		}
+
+		auto result = scn::scan<std::string>(ctx.range(), R"("{:[^"]}")");
+		if (!result) {
+			return unexpected(result.error());
+		}
+		value = result->value();
+		return result->begin();
+	}
+
+	scan_expected<typename ContextType::iterator>
+	scanner<WebStat::QueryString>::scan(WebStat::QueryString & value, ContextType & ctx)
+	{
+		if (auto null = scn::scan<>(ctx.range(), R"("")")) {
+			return null->begin();
+		}
+
+		if (auto empty = scn::scan<>(ctx.range(), R"("?")")) {
+			value.emplace();
+			return empty->begin();
+		}
+
+		auto result = scn::scan<std::string>(ctx.range(), R"("?{:[^"]}")");
+		if (!result) {
+			return unexpected(result.error());
+		}
+		value = result->value();
+		return result->begin();
+	}
+
+	scan_expected<typename ContextType::iterator>
+	scanner<WebStat::CLFString>::scan(WebStat::CLFString & value, ContextType & ctx)
+	{
+		if (auto empty = scn::scan<>(ctx.range(), R"("")")) {
+			value.emplace();
+			return empty->begin();
+		}
+
+		if (auto null = scn::scan<>(ctx.range(), R"("-")")) {
+			return null->begin();
+		}
+
+		auto result = scn::scan<std::string>(ctx.range(), R"("{:[^"]}")");
+		if (!result) {
+			return unexpected(result.error());
+		}
+		value = result->value();
+		decode(*value);
+		return result->begin();
+	}
+
+	void
+	scanner<WebStat::CLFString>::decode(std::string & value)
+	{
+		static constexpr auto BS_MAP = []() {
+			std::array<char, 128> map {};
+			map['f'] = '\f';
+			map['n'] = '\n';
+			map['r'] = '\r';
+			map['t'] = '\t';
+			map['v'] = '\v';
+			map['"'] = '"';
+			map['\\'] = '\\';
+			return map;
+		}();
+
+		if (auto src = std::ranges::find(value, '\\'); src != value.end()) {
+			auto dest = src;
+			while (src != value.cend()) {
+				if (*src == '\\') {
+					const std::string_view escaped {++src, value.end()};
+					if (auto chr = BS_MAP[static_cast<unsigned char>(*src)]) {
+						*dest++ = chr;
+						src++;
+					}
+					else if (auto hex = scn::scan<unsigned char>(escaped, R"(x{:.2x})")) {
+						*dest++ = static_cast<char>(hex->value());
+						src += 3;
+					}
+				}
+				else {
+					*dest++ = *src++;
+				}
+			}
+			value.erase(dest, value.end());
+		}
+	}
+}