Added String.Split

BeefySysLib/util/String.h

@@ -2,6 +2,7 @@
 
 #include "BFPlatform.h"
 #include "Array.h"
+#include "SizedArray.h"
 
 NS_BF_BEGIN;
 
@@ -10,6 +11,8 @@ class StringT;
 
 typedef StringT<16> String;
 
+struct StringSplitEnumerator;
+
 class StringView
 {
 public:
@@ -99,6 +102,11 @@ public:
 		return strB[mLength] != 0;
 	}
 
+	bool IsEmpty() const
+	{
+		return mLength == 0;
+	}
+
 	intptr IndexOf(const StringView& subStr, bool ignoreCase = false) const;
 	intptr IndexOf(const StringView& subStr, int32 startIdx) const;
 	intptr IndexOf(const StringView& subStr, int64 startIdx) const;
@@ -107,6 +115,22 @@ public:
 	intptr LastIndexOf(char c, intptr startCheck) const;
 	String ToString() const;
 	void ToString(StringImpl& str) const;
+	void RemoveFromStart(intptr length)
+	{
+		BF_ASSERT((uintptr)length <= (uintptr)mLength);
+		mPtr += length;
+		mLength -= (int)length;
+	}
+
+	void RemoveToEnd(int startIdx)
+	{
+		RemoveFromEnd(mLength - startIdx);
+	}
+
+	void RemoveFromEnd(int length)
+	{
+		mLength -= length;
+	}
 
 	bool Contains(char c) const
 	{
@@ -117,6 +141,180 @@ public:
 	{
 		return IndexOf(str) != -1;
 	}	
+
+	StringSplitEnumerator Split(char c);	
+};
+
+struct StringSplitEnumerator
+{
+public:
+	typedef std::random_access_iterator_tag iterator_category;
+	typedef char value_type;
+	typedef intptr difference_type;
+
+	typedef char* pointer;
+	typedef char& reference;
+
+public:
+	char mSplitChar0;
+	SizedArray<char, 8> mSplitChars;
+	const char* mPtr;
+	int32 mStrLen;
+	int32 mCurCount;
+	int32 mMaxCount;
+	int32 mPos;
+	int32 mMatchPos;
+	bool mRemoveEntryEntries;
+
+	StringSplitEnumerator(const char* ptr, int strLength, const char* splitCharsPtr, int splitCharCount, int count, bool removeEmptyEntries)
+	{
+		mPtr = ptr;
+		mStrLen = strLength;
+		// 		if (splitChars.Count > 0)
+		// 			mSplitChar0 = splitChars[0];
+		// 		else
+		// 			mSplitChar0 = '\0';
+		mSplitChar0 = splitCharsPtr[0];
+		if (splitCharCount > 1)
+		{
+			mSplitChars.Insert(0, splitCharsPtr + 1, splitCharCount - 1);
+		}
+
+		mCurCount = 0;
+		mMaxCount = (int32)count;
+		mPos = 0;
+		mMatchPos = -1;
+
+		MoveNext();
+		//mSplitOptions = splitOptions;
+	}
+
+	StringSplitEnumerator(const char* ptr, int strLength, char splitChar, int count, bool removeEmptyEntries)
+	{
+		mPtr = ptr;
+		mStrLen = strLength;
+		mSplitChar0 = splitChar;
+		mCurCount = 0;
+		mMaxCount = (int32)count;
+		mPos = 0;
+		mMatchPos = -1;
+		//mSplitOptions = splitOptions;
+		MoveNext();
+	}
+
+
+	bool MoveNext()
+	{
+		if (mCurCount >= mMaxCount)
+			return false;
+
+		mPos = mMatchPos + 1;
+
+		mCurCount++;
+		if (mCurCount == mMaxCount)
+		{
+			mMatchPos = mStrLen;
+			if (mPos > mMatchPos)
+				return false;
+			if ((mMatchPos == mPos) && (mRemoveEntryEntries))
+				return false;
+			return true;
+		}
+
+		int endDiff = mStrLen - mMatchPos;
+		if (endDiff == 0)
+			return false;
+		while (true)
+		{
+			mMatchPos++;
+			endDiff--;
+			bool foundMatch = false;
+			if (endDiff == 0)
+			{
+				foundMatch = true;
+			}
+			else
+			{
+				char c = mPtr[mMatchPos];
+				if (c == mSplitChar0)
+				{
+					foundMatch = true;
+				}
+				else if (mSplitChars.mSize > 0)
+				{
+					for (int i = 1; i < mSplitChars.mSize; i++)
+						if (c == mSplitChars[i])
+							foundMatch = true;
+				}
+			}
+
+			if (foundMatch)
+			{
+				if ((mMatchPos > mPos + 1) || (!mRemoveEntryEntries))
+					return true;
+				mPos = mMatchPos + 1;
+				if (mPos >= mStrLen)
+					return false;
+			}
+		}
+	}
+
+	StringSplitEnumerator& operator++()
+	{
+		MoveNext();
+		return *this;
+	}
+
+	StringSplitEnumerator operator++(int)
+	{
+		auto prevVal = *this;
+		MoveNext();
+		return prevVal;
+	}
+
+	bool operator!=(const StringSplitEnumerator& itr) const
+	{
+		return
+			(itr.mPtr != mPtr) ||
+			(itr.mPos != mPos) ||
+			(itr.mMatchPos != mMatchPos);
+	}
+
+	bool operator==(const StringSplitEnumerator& itr) const
+	{
+		return
+			(itr.mPtr == mPtr) &&
+			(itr.mPos == mPos) &&
+			(itr.mMatchPos == mMatchPos);
+	}
+
+	StringView operator*()
+	{
+		return StringView(mPtr + mPos, mMatchPos - mPos);
+	}
+
+	StringView operator->()
+	{
+		return StringView(mPtr + mPos, mMatchPos - mPos);
+	}
+
+	bool operator<(const StringSplitEnumerator& val2)
+	{
+		return mPtr < val2.mPtr;
+	}
+
+	StringSplitEnumerator begin()
+	{
+		return *this;
+	}
+
+	StringSplitEnumerator end()
+	{
+		StringSplitEnumerator endVal = *this;
+		endVal.mPos = endVal.mStrLen + 1;
+		endVal.mMatchPos = endVal.mStrLen;		
+		return endVal;
+	}
 };
 
 class StringImpl
@@ -675,7 +873,8 @@ public:
 
 	void Remove(intptr startIdx, intptr length);	
 	void Remove(intptr char8Idx);	
-	void RemoveToEnd(intptr startIdx);	
+	void RemoveToEnd(intptr startIdx);		
+	void RemoveFromEnd(intptr length);	
 	void Insert(intptr idx, const StringImpl& addString);
 	void Insert(intptr idx, const char* str, intptr len);
 	void Insert(intptr idx, char c);
@@ -766,6 +965,11 @@ public:
 	intptr LastIndexOf(char c) const;	
 	intptr LastIndexOf(char c, intptr startCheck) const;
 	
+	StringSplitEnumerator Split(char c)
+	{
+		return StringSplitEnumerator(GetPtr(), mLength, c, 0x7FFFFFFF, false);
+	}
+
 	bool Contains(char c) const
 	{
 		return IndexOf(c) != -1;