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diff --git a/src/CharacterCategoryMap.h b/src/CharacterCategoryMap.h
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+++ b/src/CharacterCategoryMap.h
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+// Scintilla source code edit control
+/** @file CharacterCategoryMap.h
+ ** Returns the Unicode general category of a character.
+ ** Similar code to Lexilla's lexilla/lexlib/CharacterCategory.h but renamed
+ ** to avoid problems with builds that statically include both Scintilla and Lexilla.
+ **/
+// Copyright 2013 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef CHARACTERCATEGORYMAP_H
+#define CHARACTERCATEGORYMAP_H
+
+namespace Scintilla {
+
+enum CharacterCategory {
+	ccLu, ccLl, ccLt, ccLm, ccLo,
+	ccMn, ccMc, ccMe,
+	ccNd, ccNl, ccNo,
+	ccPc, ccPd, ccPs, ccPe, ccPi, ccPf, ccPo,
+	ccSm, ccSc, ccSk, ccSo,
+	ccZs, ccZl, ccZp,
+	ccCc, ccCf, ccCs, ccCo, ccCn
+};
+
+CharacterCategory CategoriseCharacter(int character);
+
+// Common definitions of allowable characters in identifiers from UAX #31.
+bool IsIdStart(int character);
+bool IsIdContinue(int character);
+bool IsXidStart(int character);
+bool IsXidContinue(int character);
+
+class CharacterCategoryMap {
+private:
+	std::vector<unsigned char> dense;
+public:
+	CharacterCategoryMap();
+	CharacterCategory CategoryFor(int character) const {
+		if (static_cast<size_t>(character) < dense.size()) {
+			return static_cast<CharacterCategory>(dense[character]);
+		} else {
+			// binary search through ranges
+			return CategoriseCharacter(character);
+		}
+	}
+	int Size() const noexcept;
+	void Optimize(int countCharacters);
+};
+
+}
+
+#endif