Supported `←`.

README.md

@@ -386,7 +386,7 @@ assert(g.parse(" Hello BNF! "));
 Unicode support
 ---------------
 
-Since cpp-peglib only accepts 8 bits characters, it probably accepts UTF-8 text. But `.` matches only a byte, not a Unicode character. Also, it dosn't support `\u????`. 
+Since cpp-peglib only accepts 8 bits characters, it probably accepts UTF-8 text. But `.` matches only a byte, not a Unicode character. Also, it dosn't support `\u????`.
 
 Sample codes
 ------------
@@ -408,7 +408,6 @@ TODO
 ----
 
   * Unicode support (`.` matches a Unicode char. `\u????`, `\p{L}`)
-  * Allow `←` and `ε`
 
 License
 -------

peglib.h

@@ -1810,7 +1810,7 @@ private:
                                seq(lit("\\x"), cls("0-9a-fA-F"), opt(cls("0-9a-fA-F"))),
                                seq(npd(chr('\\')), dot()));
 
-        g["LEFTARROW"]  <= seq(lit("<-"), g["Spacing"]);
+        g["LEFTARROW"]  <= seq(cho(lit("<-"), lit("←")), g["Spacing"]);
         ~g["SLASH"]     <= seq(chr('/'), g["Spacing"]);
         g["AND"]        <= seq(chr('&'), g["Spacing"]);
         g["NOT"]        <= seq(chr('!'), g["Spacing"]);

test/test.cc

@@ -8,7 +8,7 @@
 TEST_CASE("Simple syntax test", "[general]")
 {
     peg::parser parser(
-        " ROOT <- _ "
+        " ROOT ← _ "
         " _ <- ' ' "
     );