Set up rime-frost basic configuration

lua/cold_word_drop/string.lua

@@ -0,0 +1,41 @@
+-- wrap utf8.sub(str,head_index, tail_index)
+-- wrap string.split(str,sp,sp1)
+--      string.utf8_len = utf8.len
+--      string.utf8_offset= utf8.offset
+--      string.utf8_sub= utf8.sub
+function string.split(str, sp, sp1)
+    sp = type(sp) == "string" and sp or " "
+    if #sp == 0 then
+        sp = "([%z\1-\127\194-\244][\128-\191]*)"
+    elseif #sp == 1 then
+        sp = "[^" .. (sp == "%" and "%%" or sp) .. "]*"
+    else
+        sp1 = sp1 or "^"
+        str = str:gsub(sp, sp1)
+        sp = "[^" .. sp1 .. "]*"
+    end
+
+    local tab = {}
+    for v in str:gmatch(sp) do
+        table.insert(tab, v)
+    end
+    return tab
+end
+
+function utf8.gsub(str, si, ei)
+    local function index(ustr, i)
+        return i >= 0 and (ustr:utf8_offset(i) or ustr:len() + 1)
+            or (ustr:utf8_offset(i) or 1)
+    end
+
+    local u_si = index(str, si)
+    ei = ei or str:utf8_len()
+    ei = ei >= 0 and ei + 1 or ei
+    local u_ei = index(str, ei) - 1
+    return str:sub(u_si, u_ei)
+end
+
+string.utf8_len = utf8.len
+string.utf8_offset = utf8.offset
+string.utf8_sub = utf8.gsub
+return true