Merge pull request mruby#967 from iij/pr-string-strip

add "strip" family methods of String to mruby-string-ext

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

mrbgems/mruby-string-ext/test/string.rb

@@ -16,3 +16,57 @@
 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