3 files changed, 97 insertions, 1 deletions
diff --git a/mrbgems/mruby-string-ext/mrblib/string.rb b/mrbgems/mruby-string-ext/mrblib/string.rb
new file mode 100644
index 000000000..142a63882
--- /dev/null
+++ b/mrbgems/mruby-string-ext/mrblib/string.rb
@@ -0,0 +1,38 @@
+class String
+  def lstrip
+    a = 0
+    z = self.size - 1
+    a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
+    (z >= 0) ? self[a..z] : ""
+  end
+
+  def rstrip
+    a = 0
+    z = self.size - 1
+    z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
+    (z >= 0) ? self[a..z] : ""
+  end
+
+  def strip
+    a = 0
+    z = self.size - 1
+    a += 1 while " \f\n\r\t\v".include?(self[a]) and a <= z
+    z -= 1 while " \f\n\r\t\v\0".include?(self[z]) and a <= z
+    (z >= 0) ? self[a..z] : ""
+  end
+
+  def lstrip!
+    s = self.lstrip
+    (s == self) ? nil : self.replace(s)
+  end
+
+  def rstrip!
+    s = self.rstrip
+    (s == self) ? nil : self.replace(s)
+  end
+
+  def strip!
+    s = self.strip
+    (s == self) ? nil : self.replace(s)
+  end
+end
diff --git a/mrbgems/mruby-string-ext/src/string.c b/mrbgems/mruby-string-ext/src/string.c
index 175426638..b10b021a2 100644
--- a/mrbgems/mruby-string-ext/src/string.c
+++ b/mrbgems/mruby-string-ext/src/string.c
@@ -21,7 +21,8 @@ mrb_mruby_string_ext_gem_init(mrb_state* mrb)
 {
   struct RClass * s = mrb->string_class;
 
-  mrb_define_method(mrb, s, "getbyte", mrb_str_getbyte, ARGS_REQ(1));
+  mrb_define_method(mrb, s, "dump",            mrb_str_dump,            ARGS_NONE());
+  mrb_define_method(mrb, s, "getbyte",         mrb_str_getbyte,         ARGS_REQ(1));
 }
 
 void
diff --git a/mrbgems/mruby-string-ext/test/string.rb b/mrbgems/mruby-string-ext/test/string.rb
index 9a7579131..eaff81890 100644
--- a/mrbgems/mruby-string-ext/test/string.rb
+++ b/mrbgems/mruby-string-ext/test/string.rb
@@ -13,3 +13,60 @@ assert('String#getbyte') do
   assert_equal bytes2[0], str2.getbyte(0)
 end
 
+assert('String#dump') do
+  "foo".dump == "\"foo\""
+end
+
+assert('String#strip') do
+  s = "  abc  " 
+  s.strip
+  "".strip == "" and " \t\r\n\f\v".strip == "" and
+  "\0a\0".strip == "\0a" and
+  "abc".strip     == "abc" and
+  "  abc".strip   == "abc" and
+  "abc  ".strip   == "abc" and
+  "  abc  ".strip == "abc" and
+  s == "  abc  "
+end
+
+assert('String#lstrip') do
+  s = "  abc  " 
+  s.lstrip
+  "".lstrip == "" and " \t\r\n\f\v".lstrip == "" and
+  "\0a\0".lstrip == "\0a\0" and
+  "abc".lstrip     == "abc"   and
+  "  abc".lstrip   == "abc"   and
+  "abc  ".lstrip   == "abc  " and
+  "  abc  ".lstrip == "abc  " and
+  s == "  abc  "
+end
+
+assert('String#rstrip') do
+  s = "  abc  " 
+  s.rstrip
+  "".rstrip == "" and " \t\r\n\f\v".rstrip == "" and
+  "\0a\0".rstrip == "\0a" and
+  "abc".rstrip     == "abc"   and
+  "  abc".rstrip   == "  abc" and
+  "abc  ".rstrip   == "abc"   and
+  "  abc  ".rstrip == "  abc" and
+  s == "  abc  "
+end
+
+assert('String#strip!') do
+  s = "  abc  "
+  t = "abc"
+  s.strip! == "abc" and s == "abc" and t.strip! == nil
+end
+
+assert('String#lstrip!') do
+  s = "  abc  "
+  t = "abc  "
+  s.lstrip! == "abc  " and s == "abc  " and t.lstrip! == nil
+end
+
+assert('String#rstrip!') do
+  s = "  abc  "
+  t = "  abc"
+  s.rstrip! == "  abc" and s == "  abc" and t.rstrip! == nil
+end