...

cxx/CMakeLists.txt

@@ -13,4 +13,5 @@ set(COMM_PROTO_LIB_SRC comm_proto.h comm_proto.cpp)
 set(COMM_PROTO_LIB comm_proto)
 add_library(${COMM_PROTO_LIB} STATIC ${COMM_PROTO_LIB_SRC}
     control_proto.h
-    control_proto.cpp)
+    control_proto.cpp
+    utils.h)

cxx/utils.h

@@ -0,0 +1,137 @@
+#pragma once
+
+#include <ranges>
+#include <regex>
+
+namespace mcc::utils
+{
+
+static const std::regex decimalNumberRx{" *[-+]?([0-9]*[.])?[0-9]+([eE][-+]?[0-9]+)? *"};
+static const std::regex sexagesimalReprRx{" *[-+]?[0-9]{1,2}:[0-9]{1,2}:([0-9]{0,2}[.])?[0-9]+ *"};
+
+enum class TrimType { TRIM_LEFT, TRIM_RIGHT, TRIM_BOTH };
+
+template <std::ranges::contiguous_range R>
+static std::string_view trimSpaces(R&& r, TrimType type = TrimType::TRIM_BOTH)
+    requires std::same_as<char, std::remove_cvref_t<std::ranges::range_value_t<R>>>
+{
+    auto is_space = [](const auto& ch) { return ch == ' '; };
+
+    auto end = std::forward<R>(r).end();
+
+    auto f1 = std::forward<R>(r).begin();
+
+    if (type != TrimType::TRIM_RIGHT) {
+        // look for the first non-space symbol
+        f1 = std::ranges::find_if_not(std::forward<R>(r), is_space);
+        if (f1 == end) {  // all are spaces!
+            return std::string_view();
+        }
+    }
+
+    auto f2 = end;
+
+    if (type != TrimType::TRIM_LEFT) {
+        auto f3 = f1;
+
+        do {
+            f2 = std::ranges::find_if(++f3, end, is_space);
+            if (f2 == end)
+                break;
+            f3 = std::ranges::find_if_not(f2 + 1, end, is_space);
+        } while (f3 != end);
+    }
+
+    return std::string_view(f1, f2);
+}
+
+
+template <typename T, std::ranges::contiguous_range R>
+std::optional<T> numFromStr(R&& r)
+    requires((std::integral<T> || std::floating_point<T>) &&
+             std::same_as<char, std::remove_cvref_t<std::ranges::range_value_t<R>>>)
+{
+    T val;
+    const char* end_ptr = &*r.end();
+
+    if constexpr (std::integral<T>) {
+        auto cvt_res = std::from_chars(&*r.begin(), &*r.end(), val);
+        if (cvt_res.ec != std::errc()) {
+            return std::nullopt;
+        } else if (cvt_res.ptr != end_ptr) {
+            return std::nullopt;
+        }
+    } else {
+#ifdef _LIBCPP_VERSION  // clang's libc++ does not have floating-point overloads for std::from_chars
+        std::string s{str.begin(), str.end()};
+        size_t pos;
+
+        try {
+            if constexpr (std::same_as<T, float>) {
+                val = std::stof(s, &pos);
+            } else if constexpr (std::same_as<T, double>) {
+                val = std::stod(s, &pos);
+            } else {
+                val = std::stold(s, &pos);
+            }
+        } catch (...) {
+            return std::nullopt;
+        }
+
+        if (pos != s.size()) {
+            return std::nullopt;
+        }
+#else
+        auto cvt_res = std::from_chars(&*r.begin(), &*r.end(), val);
+
+        if (cvt_res.ec != std::errc()) {
+            return std::nullopt;
+        } else if (cvt_res.ptr != end_ptr) {
+            return std::nullopt;
+        }
+#endif
+    }
+
+    return val;
+}
+
+template <std::ranges::contiguous_range R>
+static std::optional<double> parsAngleString(R&& r, bool hms = false)
+    requires std::same_as<char, std::remove_cvref_t<std::ranges::range_value_t<R>>>
+{
+    auto str = trimSpaces(std::forward<R>(r));
+
+    bool ok = std::regex_match(str.begin(), str.end(), decimalNumberRx);
+
+    if (ok) {
+        return numFromStr<double>(str);
+    }
+
+    ok = std::regex_match(str.begin(), str.end(), sexagesimalReprRx);
+
+    if (ok) {
+        auto str = trimSpaces(std::forward<R>(r));
+        auto parts = std::views::split(str, ":");
+
+        double val;
+
+        double p1 = numFromStr<double>(parts[0]);
+        val = std::abs(p1);
+        val += numFromStr<double>(parts[1]) / 60.0;
+        val += numFromStr<double>(parts[2]) / 3600.0;
+        if (p1 < 0) {
+            val = -val;
+        }
+
+        if (hms) {
+            val *= 15.0;
+        }
+
+        return val;
+    }
+
+
+    return std::nullopt;
+}
+
+}  // namespace mcc::utils