1 files changed, 208 insertions, 0 deletions
diff --git a/src/CharacterSet.h b/src/CharacterSet.h
new file mode 100644
index 000000000..a518c27fc
--- /dev/null
+++ b/src/CharacterSet.h
@@ -0,0 +1,208 @@
+// Scintilla source code edit control
+/** @file CharacterSet.h
+ ** Encapsulates a set of characters. Used to test if a character is within a set.
+ **/
+// Copyright 2007 by Neil Hodgson <neilh@scintilla.org>
+// The License.txt file describes the conditions under which this software may be distributed.
+
+#ifndef CHARACTERSET_H
+#define CHARACTERSET_H
+
+namespace Scintilla {
+
+class CharacterSet {
+	int size;
+	bool valueAfter;
+	bool *bset;
+public:
+	enum setBase {
+		setNone=0,
+		setLower=1,
+		setUpper=2,
+		setDigits=4,
+		setAlpha=setLower|setUpper,
+		setAlphaNum=setAlpha|setDigits
+	};
+	CharacterSet(setBase base=setNone, const char *initialSet="", int size_=0x80, bool valueAfter_=false) {
+		size = size_;
+		valueAfter = valueAfter_;
+		bset = new bool[size];
+		for (int i=0; i < size; i++) {
+			bset[i] = false;
+		}
+		AddString(initialSet);
+		if (base & setLower)
+			AddString("abcdefghijklmnopqrstuvwxyz");
+		if (base & setUpper)
+			AddString("ABCDEFGHIJKLMNOPQRSTUVWXYZ");
+		if (base & setDigits)
+			AddString("0123456789");
+	}
+	CharacterSet(const CharacterSet &other) {
+		size = other.size;
+		valueAfter = other.valueAfter;
+		bset = new bool[size];
+		for (int i=0; i < size; i++) {
+			bset[i] = other.bset[i];
+		}
+	}
+	CharacterSet(CharacterSet &&other) noexcept {
+		size = other.size;
+		valueAfter = other.valueAfter;
+		bset = other.bset;
+		other.size = 0;
+		other.bset = nullptr;
+	}
+	CharacterSet &operator=(const CharacterSet &other) {
+		if (this != &other) {
+			bool *bsetNew = new bool[other.size];
+			for (int i = 0; i < other.size; i++) {
+				bsetNew[i] = other.bset[i];
+			}
+			delete[]bset;
+			size = other.size;
+			valueAfter = other.valueAfter;
+			bset = bsetNew;
+		}
+		return *this;
+	}
+	CharacterSet &operator=(CharacterSet &&other) noexcept {
+		if (this != &other) {
+			delete []bset;
+			size = other.size;
+			valueAfter = other.valueAfter;
+			bset = other.bset;
+			other.size = 0;
+			other.bset = nullptr;
+		}
+		return *this;
+	}
+	~CharacterSet() {
+		delete []bset;
+		bset = nullptr;
+		size = 0;
+	}
+	void Add(int val) {
+		assert(val >= 0);
+		assert(val < size);
+		bset[val] = true;
+	}
+	void AddString(const char *setToAdd) {
+		for (const char *cp=setToAdd; *cp; cp++) {
+			const unsigned char uch = *cp;
+			assert(uch < size);
+			bset[uch] = true;
+		}
+	}
+	bool Contains(int val) const noexcept {
+		assert(val >= 0);
+		if (val < 0) return false;
+		return (val < size) ? bset[val] : valueAfter;
+	}
+	bool Contains(char ch) const noexcept {
+		// Overload char as char may be signed
+		const unsigned char uch = ch;
+		return Contains(uch);
+	}
+};
+
+// Functions for classifying characters
+
+constexpr bool IsASpace(int ch) noexcept {
+    return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
+}
+
+constexpr bool IsASpaceOrTab(int ch) noexcept {
+	return (ch == ' ') || (ch == '\t');
+}
+
+constexpr bool IsADigit(int ch) noexcept {
+	return (ch >= '0') && (ch <= '9');
+}
+
+constexpr bool IsADigit(int ch, int base) noexcept {
+	if (base <= 10) {
+		return (ch >= '0') && (ch < '0' + base);
+	} else {
+		return ((ch >= '0') && (ch <= '9')) ||
+		       ((ch >= 'A') && (ch < 'A' + base - 10)) ||
+		       ((ch >= 'a') && (ch < 'a' + base - 10));
+	}
+}
+
+constexpr bool IsASCII(int ch) noexcept {
+	return (ch >= 0) && (ch < 0x80);
+}
+
+constexpr bool IsLowerCase(int ch) noexcept {
+	return (ch >= 'a') && (ch <= 'z');
+}
+
+constexpr bool IsUpperCase(int ch) noexcept {
+	return (ch >= 'A') && (ch <= 'Z');
+}
+
+constexpr bool IsUpperOrLowerCase(int ch) noexcept {
+	return IsUpperCase(ch) || IsLowerCase(ch);
+}
+
+constexpr bool IsAlphaNumeric(int ch) noexcept {
+	return
+		((ch >= '0') && (ch <= '9')) ||
+		((ch >= 'a') && (ch <= 'z')) ||
+		((ch >= 'A') && (ch <= 'Z'));
+}
+
+/**
+ * Check if a character is a space.
+ * This is ASCII specific but is safe with chars >= 0x80.
+ */
+constexpr bool isspacechar(int ch) noexcept {
+    return (ch == ' ') || ((ch >= 0x09) && (ch <= 0x0d));
+}
+
+constexpr bool iswordchar(int ch) noexcept {
+	return IsAlphaNumeric(ch) || ch == '.' || ch == '_';
+}
+
+constexpr bool iswordstart(int ch) noexcept {
+	return IsAlphaNumeric(ch) || ch == '_';
+}
+
+constexpr bool isoperator(int ch) noexcept {
+	if (IsAlphaNumeric(ch))
+		return false;
+	if (ch == '%' || ch == '^' || ch == '&' || ch == '*' ||
+	        ch == '(' || ch == ')' || ch == '-' || ch == '+' ||
+	        ch == '=' || ch == '|' || ch == '{' || ch == '}' ||
+	        ch == '[' || ch == ']' || ch == ':' || ch == ';' ||
+	        ch == '<' || ch == '>' || ch == ',' || ch == '/' ||
+	        ch == '?' || ch == '!' || ch == '.' || ch == '~')
+		return true;
+	return false;
+}
+
+// Simple case functions for ASCII supersets.
+
+template <typename T>
+constexpr T MakeUpperCase(T ch) noexcept {
+	if (ch < 'a' || ch > 'z')
+		return ch;
+	else
+		return ch - 'a' + 'A';
+}
+
+template <typename T>
+constexpr T MakeLowerCase(T ch) noexcept {
+	if (ch < 'A' || ch > 'Z')
+		return ch;
+	else
+		return ch - 'A' + 'a';
+}
+
+int CompareCaseInsensitive(const char *a, const char *b) noexcept;
+int CompareNCaseInsensitive(const char *a, const char *b, size_t len) noexcept;
+
+}
+
+#endif