Possibly merge consecutive script fragments to reduce execution overhead

third_party/WebKit/Source/platform/text/SegmentedString.h

Index: third_party/WebKit/Source/platform/text/SegmentedString.h
diff --git a/third_party/WebKit/Source/platform/text/SegmentedString.h b/third_party/WebKit/Source/platform/text/SegmentedString.h
index 49f00fab74dedfefba7429f5165e6ea9da23c8b1..c803031fcc4eb89171fc247b07954f5e108a1f14 100644
--- a/third_party/WebKit/Source/platform/text/SegmentedString.h
+++ b/third_party/WebKit/Source/platform/text/SegmentedString.h
@@ -127,11 +127,28 @@ class PLATFORM_EXPORT SegmentedSubstring {
     return *++m_data.string16Ptr;
   }
 
+  UChar getCharByIndex8(unsigned index) {
+    ASSERT(m_data.string8Ptr);
+    m_data.string8Ptr += index;
+    return *m_data.string8Ptr;
+  }
+
+  UChar getCharByIndex16(unsigned index) {
+    ASSERT(m_data.string16Ptr);
+    m_data.string16Ptr += index;
+    return *m_data.string16Ptr;
+  }
+
   String currentSubString(unsigned length) {
     int offset = m_string.length() - m_length;
     return m_string.substring(offset, length);
   }
 
+  String currentSubString(unsigned pos, unsigned length) {
+    int offset = m_string.length() - m_length + pos;
+    return m_string.substring(offset, length);
+  }
+
   ALWAYS_INLINE UChar getCurrentChar() {
     ASSERT(m_length);
     if (is8Bit())
@@ -146,6 +163,13 @@ class PLATFORM_EXPORT SegmentedSubstring {
     return incrementAndGetCurrentChar16();
   }
 
+  ALWAYS_INLINE UChar getCharByIndex(unsigned index) {
+    ASSERT(m_length - index);
+    if (is8Bit())
+      return getCharByIndex8(index);
+    return getCharByIndex16(index);
+  }
+
   ALWAYS_INLINE bool haveOneCharacterLeft() const { return m_length == 1; }
 
   ALWAYS_INLINE void decrementLength() { --m_length; }
@@ -303,6 +327,25 @@ class PLATFORM_EXPORT SegmentedString {
   String toString() const;
 
   UChar currentChar() const { return m_currentChar; }
+  SegmentedSubstring getCurrentString() const { return m_currentString; }
+
+  String getCurrentSubstring(unsigned length) {
+    return m_currentString.currentSubString(length);
+  }
+
+  String getCurrentSubstring(unsigned pos, unsigned length) {
+    return m_currentString.currentSubString(pos, length);
+  }
+
+  bool isEqualToScriptStartTagTemplate(const String& str) {
+    String stringTemplate("<script");
+    return equalPossiblyIgnoringCase(stringTemplate, str, true);
+  }
+
+  bool isEqualToScriptEndTagTemplate(const String& str) {
+    String stringTemplate("</script>");
+    return equalPossiblyIgnoringCase(stringTemplate, str, true);
+  }
 
   // The method is moderately slow, comparing to currentLine method.
   OrdinalNumber currentColumn() const;