add "strip" family to String.

1 files changed, 38 insertions, 0 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