Implement String#contains

fixes #8659

doc/20-library-reference.md

@@ -399,6 +399,20 @@ Example:
 
     "Hello World".find("World") /* Returns 6 */
 
+### <a id="string-contains"></a> String#contains
+
+Signature:
+
+    function contains(str);
+
+Returns `true` if the string `str` was found in the string. If the string
+was not found `false` is returned. Use [find](20-library-reference.md#string-find)
+for getting the index instead.
+
+Example:
+
+    "Hello World".contains("World") /* Returns true */
+
 ### <a id="string-len"></a> String#len
 
 Signature

lib/base/string-script.cpp

@@ -110,6 +110,13 @@ static Value StringFind(const std::vector<Value>& args)
 		return result;
 }
 
+static bool StringContains(const Value& value)
+{
+	ScriptFrame *vframe = ScriptFrame::GetCurrentFrame();
+	String self = vframe->Self;
+	return self.Contains(value);
+}
+
 static Value StringReplace(const String& search, const String& replacement)
 {
 	ScriptFrame *vframe = ScriptFrame::GetCurrentFrame();
@@ -133,6 +140,7 @@ Object::Ptr String::GetPrototype(void)
 		prototype->Set("lower", new Function(WrapFunction(StringLower)));
 		prototype->Set("split", new Function(WrapFunction(StringSplit)));
 		prototype->Set("find", new Function(WrapFunction(StringFind)));
+		prototype->Set("contains", new Function(WrapFunction(StringContains)));
 		prototype->Set("replace", new Function(WrapFunction(StringReplace)));
 	}