Implement minlength for <input> and <textarea>.

Source/core/html/HTMLTextAreaElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 171 matching lines @@
             wrap = NoWrap;
         else
             wrap = SoftWrap;
         if (wrap != m_wrap) {
             m_wrap = wrap;
             if (renderer())
                 renderer()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
         }
     } else if (name == accesskeyAttr) {
         // ignore for the moment
-    } else if (name == maxlengthAttr)
+    } else if (name == maxlengthAttr) {
         setNeedsValidityCheck();
-    else
+    } else if (name == minlengthAttr) {
+        setNeedsValidityCheck();
+    } else
         HTMLTextFormControlElement::parseAttribute(name, value);
 }
 
 RenderObject* HTMLTextAreaElement::createRenderer(RenderStyle*)
 {
     return new RenderTextControlMultiLine(this);
 }
 
 bool HTMLTextAreaElement::appendFormData(FormDataList& encoding, bool)
 {
@@ skipping 239 matching lines @@
         setNonDirtyValue(value);
 }
 
 int HTMLTextAreaElement::maxLength() const
 {
     bool ok;
     int value = getAttribute(maxlengthAttr).toInt(&ok);
     return ok && value >= 0 ? value : -1;
 }
 
+int HTMLTextAreaElement::minLength() const
+{
+    bool ok;
+    int value = getAttribute(minlengthAttr).string().toInt(&ok);

[tkent, 2014/10/15 00:50:25]

should use parseHTMLInteger() like HTMLInputElement::parseMinLengthAttribute().

The maxlength() above is not good too.

[Bartek Nowierski, 2014/10/16 04:55:14]

Good point! I'll change it for both minLength and maxLength.

+    return ok && value >= 0 ? value : -1;
+}
+
 void HTMLTextAreaElement::setMaxLength(int newValue, ExceptionState& exceptionState)
 {
+    int min = minLength();
     if (newValue < 0)
         exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(newValue) + ") is not positive or 0.");
+    else if (min >= 0 && newValue < min)
+        exceptionState.throwDOMException(IndexSizeError, ExceptionMessages::indexExceedsMinimumBound("maxLength", newValue, min));
     else
         setIntegralAttribute(maxlengthAttr, newValue);
 }
 
+void HTMLTextAreaElement::setMinLength(int newValue, ExceptionState& exceptionState)
+{
+    int max = maxLength();
+    if (newValue < 0)
+        exceptionState.throwDOMException(IndexSizeError, "The value provided (" + String::number(newValue) + ") is not positive or 0.");
+    else if (max >= 0 && newValue > max)
+        exceptionState.throwDOMException(IndexSizeError, ExceptionMessages::indexExceedsMaximumBound("minLength", newValue, max));
+    else
+        setIntegralAttribute(minlengthAttr, newValue);
+}
+
 String HTMLTextAreaElement::suggestedValue() const
 {
     return m_suggestedValue;
 }
 
 void HTMLTextAreaElement::setSuggestedValue(const String& value)
 {
     m_suggestedValue = value;
 
     if (!value.isNull())
@@ skipping 11 matching lines @@
 
     if (customError())
         return customValidationMessage();
 
     if (valueMissing())
         return locale().queryString(blink::WebLocalizedString::ValidationValueMissing);
 
     if (tooLong())
         return locale().validationMessageTooLongText(computeLengthForSubmission(value()), maxLength());
 
+    if (tooShort())
+        return locale().validationMessageTooShortText(computeLengthForSubmission(value()), minLength());
+
     return String();
 }
 
 bool HTMLTextAreaElement::valueMissing() const
 {
     // We should not call value() for performance.
     return willValidate() && valueMissing(0);
 }
 
 bool HTMLTextAreaElement::valueMissing(const String* value) const
 {
     return isRequiredFormControl() && !isDisabledOrReadOnly() && (value ? *value : this->value()).isEmpty();
 }
 
 bool HTMLTextAreaElement::tooLong() const
 {
     // We should not call value() for performance.
     return willValidate() && tooLong(0, CheckDirtyFlag);
 }
 
+bool HTMLTextAreaElement::tooShort() const
+{
+    // We should not call value() for performance.
+    return willValidate() && tooShort(0, CheckDirtyFlag);
+}
+
 bool HTMLTextAreaElement::tooLong(const String* value, NeedsToCheckDirtyFlag check) const
 {
     // Return false for the default value or value set by script even if it is
     // longer than maxLength.
     if (check == CheckDirtyFlag && !lastChangeWasUserEdit())
         return false;
 
     int max = maxLength();
     if (max < 0)
         return false;
     return computeLengthForSubmission(value ? *value : this->value()) > static_cast<unsigned>(max);
 }
 
+bool HTMLTextAreaElement::tooShort(const String* value, NeedsToCheckDirtyFlag check) const
+{
+    // Return false for the default value or value set by script even if it is
+    // shorter than minLength.
+    if (check == CheckDirtyFlag && !lastChangeWasUserEdit())
+        return false;
+
+    int min = minLength();
+    if (min <= 0)
+        return false;
+    // An empty string is excluded from minlength check.
+    unsigned len = computeLengthForSubmission(value ? *value : this->value());
+    return len > 0 && len < static_cast<unsigned>(min);
+}
+
 bool HTMLTextAreaElement::isValidValue(const String& candidate) const
 {
-    return !valueMissing(&candidate) && !tooLong(&candidate, IgnoreDirtyFlag);
+    return !valueMissing(&candidate) && !tooLong(&candidate, IgnoreDirtyFlag) && !tooShort(&candidate, IgnoreDirtyFlag);
 }
 
 void HTMLTextAreaElement::accessKeyAction(bool)
 {
     focus();
 }
 
 void HTMLTextAreaElement::setCols(int cols)
 {
     setIntegralAttribute(colsAttr, cols);
@@ skipping 37 matching lines @@
 {
     return true;
 }
 
 bool HTMLTextAreaElement::supportsAutofocus() const
 {
     return true;
 }
 
 }