1 files changed, 42 insertions, 0 deletions
diff --git a/src/mmo/human_time_diff.cpp b/src/mmo/human_time_diff.cpp
index 49a7664..aaa7928 100644
--- a/src/mmo/human_time_diff.cpp
+++ b/src/mmo/human_time_diff.cpp
@@ -18,9 +18,51 @@
 //    You should have received a copy of the GNU General Public License
 //    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+#include "../io/extract.hpp"
+
 #include "../poison.hpp"
 
 
 namespace tmwa
 {
+bool impl_extract(XString str, HumanTimeDiff *iv)
+{
+    // str is a sequence of [-+]?[0-9]+([ay]|m|[jd]|h|mn|s)
+    // there are NO spaces here
+    // parse by counting the number starts
+    auto is_num = [](char c)
+    { return c == '-' || c == '+' || ('0' <= c && c <= '9'); };
+    if (!str || !is_num(str.front()))
+        return false;
+    *iv = HumanTimeDiff{};
+    while (str)
+    {
+        auto it = std::find_if_not(str.begin(), str.end(), is_num);
+        auto it2 = std::find_if(it, str.end(), is_num);
+        XString number = str.xislice_h(it);
+        XString suffix = str.xislice(it, it2);
+        str = str.xislice_t(it2);
+
+        short *ptr = nullptr;
+        if (suffix == "y"_s || suffix == "a"_s)
+            ptr = &iv->year;
+        else if (suffix == "m"_s)
+            ptr = &iv->month;
+        else if (suffix == "j"_s || suffix == "d"_s)
+            ptr = &iv->day;
+        else if (suffix == "h"_s)
+            ptr = &iv->hour;
+        else if (suffix == "mn"_s)
+            ptr = &iv->minute;
+        else if (suffix == "s"_s)
+            ptr = &iv->second;
+        else
+            return false;
+        if (number.startswith('+') && !number.startswith("+-"_s))
+            number = number.xslice_t(1);
+        if (*ptr || !extract(number, ptr))
+            return false;
+    }
+    return true;
+}
 } // namespace tmwa