From 8995b83bcbfbb68245f779b64e5517627c6cc6ea Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@digia.com>
Date: Wed, 17 Oct 2012 16:21:14 +0200
Subject: Imported WebKit commit cf4f8fc6f19b0629f51860cb2d4b25e139d07e00
 (http://svn.webkit.org/repository/webkit/trunk@131592)

New snapshot that includes the build fixes for Mac OS X 10.6 and earlier as well
as the previously cherry-picked changes
---
 Source/WebCore/html/HTMLTextAreaElement.cpp | 32 +++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

(limited to 'Source/WebCore/html/HTMLTextAreaElement.cpp')

diff --git a/Source/WebCore/html/HTMLTextAreaElement.cpp b/Source/WebCore/html/HTMLTextAreaElement.cpp
index a42aa7831..db98ccc9f 100644
--- a/Source/WebCore/html/HTMLTextAreaElement.cpp
+++ b/Source/WebCore/html/HTMLTextAreaElement.cpp
@@ -56,10 +56,15 @@ static const int defaultCols = 20;
 
 // On submission, LF characters are converted into CRLF.
 // This function returns number of characters considering this.
-static unsigned computeLengthForSubmission(const String& text)
+static inline unsigned computeLengthForSubmission(const String& text, unsigned numberOfLineBreaks)
+{
+    return numGraphemeClusters(text) + numberOfLineBreaks;
+}
+
+static unsigned numberOfLineBreaks(const String& text)
 {
-    unsigned count =  numGraphemeClusters(text);
     unsigned length = text.length();
+    unsigned count = 0;
     for (unsigned i = 0; i < length; i++) {
         if (text[i] == '\n')
             count++;
@@ -67,6 +72,16 @@ static unsigned computeLengthForSubmission(const String& text)
     return count;
 }
 
+static inline unsigned computeLengthForSubmission(const String& text)
+{
+    return numGraphemeClusters(text) + numberOfLineBreaks(text);
+}
+
+static inline unsigned upperBoundForLengthForSubmission(const String& text, unsigned numberOfLineBreaks)
+{
+    return text.length() + numberOfLineBreaks;
+}
+
 HTMLTextAreaElement::HTMLTextAreaElement(const QualifiedName& tagName, Document* document, HTMLFormElement* form)
     : HTMLTextFormControlElement(tagName, document, form)
     , m_rows(defaultRows)
@@ -280,7 +295,13 @@ void HTMLTextAreaElement::handleBeforeTextInsertedEvent(BeforeTextInsertedEvent*
         return;
     unsigned unsignedMaxLength = static_cast<unsigned>(signedMaxLength);
 
-    unsigned currentLength = computeLengthForSubmission(innerTextValue());
+    const String& currentValue = innerTextValue();
+    unsigned numberOfLineBreaksInCurrentValue = numberOfLineBreaks(currentValue);
+    if (upperBoundForLengthForSubmission(currentValue, numberOfLineBreaksInCurrentValue)
+        + upperBoundForLengthForSubmission(event->text(), numberOfLineBreaks(event->text())) < unsignedMaxLength)
+        return;
+
+    unsigned currentLength = computeLengthForSubmission(currentValue, numberOfLineBreaksInCurrentValue);
     // selectionLength represents the selection length of this text field to be
     // removed by this insertion.
     // If the text field has no focus, we don't need to take account of the
@@ -466,7 +487,10 @@ bool HTMLTextAreaElement::tooLong(const String& value, NeedsToCheckDirtyFlag che
     int max = maxLength();
     if (max < 0)
         return false;
-    return computeLengthForSubmission(value) > static_cast<unsigned>(max);
+    unsigned unsignedMax = static_cast<unsigned>(max);
+    unsigned numberOfLineBreaksInValue = numberOfLineBreaks(value);
+    return upperBoundForLengthForSubmission(value, numberOfLineBreaksInValue) > unsignedMax
+        && computeLengthForSubmission(value, numberOfLineBreaksInValue) > unsignedMax;
 }
 
 bool HTMLTextAreaElement::isValidValue(const String& candidate) const
-- 
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