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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+#ifndef __NUMBER_AFFIXUTILS_H__
+#define __NUMBER_AFFIXUTILS_H__
+
+#include <cstdint>
+#include "number_types.h"
+#include "unicode/stringpiece.h"
+#include "unicode/unistr.h"
+#include "number_stringbuilder.h"
+#include "unicode/uniset.h"
+
+U_NAMESPACE_BEGIN namespace number {
+namespace impl {
+
+enum AffixPatternState {
+    STATE_BASE = 0,
+    STATE_FIRST_QUOTE = 1,
+    STATE_INSIDE_QUOTE = 2,
+    STATE_AFTER_QUOTE = 3,
+    STATE_FIRST_CURR = 4,
+    STATE_SECOND_CURR = 5,
+    STATE_THIRD_CURR = 6,
+    STATE_FOURTH_CURR = 7,
+    STATE_FIFTH_CURR = 8,
+    STATE_OVERFLOW_CURR = 9
+};
+
+// enum AffixPatternType defined in internals.h
+
+struct AffixTag {
+    int32_t offset;
+    UChar32 codePoint;
+    AffixPatternState state;
+    AffixPatternType type;
+
+    AffixTag()
+            : offset(0), state(STATE_BASE) {}
+
+    AffixTag(int32_t offset)
+            : offset(offset) {}
+
+    AffixTag(int32_t offset, UChar32 codePoint, AffixPatternState state, AffixPatternType type)
+            : offset(offset), codePoint(codePoint), state(state), type(type) {}
+};
+
+class TokenConsumer {
+  public:
+    virtual ~TokenConsumer();
+
+    virtual void consumeToken(AffixPatternType type, UChar32 cp, UErrorCode& status) = 0;
+};
+
+// Exported as U_I18N_API because it is a base class for other exported types
+class U_I18N_API SymbolProvider {
+  public:
+    virtual ~SymbolProvider();
+
+    // TODO: Could this be more efficient if it returned by reference?
+    virtual UnicodeString getSymbol(AffixPatternType type) const = 0;
+};
+
+/**
+ * Performs manipulations on affix patterns: the prefix and suffix strings associated with a decimal
+ * format pattern. For example:
+ *
+ * <table>
+ * <tr><th>Affix Pattern</th><th>Example Unescaped (Formatted) String</th></tr>
+ * <tr><td>abc</td><td>abc</td></tr>
+ * <tr><td>ab-</td><td>ab−</td></tr>
+ * <tr><td>ab'-'</td><td>ab-</td></tr>
+ * <tr><td>ab''</td><td>ab'</td></tr>
+ * </table>
+ *
+ * To manually iterate over tokens in a literal string, use the following pattern, which is designed
+ * to be efficient.
+ *
+ * <pre>
+ * long tag = 0L;
+ * while (AffixPatternUtils.hasNext(tag, patternString)) {
+ *   tag = AffixPatternUtils.nextToken(tag, patternString);
+ *   int typeOrCp = AffixPatternUtils.getTypeOrCp(tag);
+ *   switch (typeOrCp) {
+ *     case AffixPatternUtils.TYPE_MINUS_SIGN:
+ *       // Current token is a minus sign.
+ *       break;
+ *     case AffixPatternUtils.TYPE_PLUS_SIGN:
+ *       // Current token is a plus sign.
+ *       break;
+ *     case AffixPatternUtils.TYPE_PERCENT:
+ *       // Current token is a percent sign.
+ *       break;
+ *     // ... other types ...
+ *     default:
+ *       // Current token is an arbitrary code point.
+ *       // The variable typeOrCp is the code point.
+ *       break;
+ *   }
+ * }
+ * </pre>
+ */
+class U_I18N_API AffixUtils {
+
+  public:
+
+    /**
+     * Estimates the number of code points present in an unescaped version of the affix pattern string
+     * (one that would be returned by {@link #unescape}), assuming that all interpolated symbols
+     * consume one code point and that currencies consume as many code points as their symbol width.
+     * Used for computing padding width.
+     *
+     * @param patternString The original string whose width will be estimated.
+     * @return The length of the unescaped string.
+     */
+    static int32_t estimateLength(const UnicodeString& patternString, UErrorCode& status);
+
+    /**
+     * Takes a string and escapes (quotes) characters that have special meaning in the affix pattern
+     * syntax. This function does not reverse-lookup symbols.
+     *
+     * <p>Example input: "-$x"; example output: "'-'$x"
+     *
+     * @param input The string to be escaped.
+     * @return The resulting UnicodeString.
+     */
+    static UnicodeString escape(const UnicodeString& input);
+
+    static Field getFieldForType(AffixPatternType type);
+
+    /**
+     * Executes the unescape state machine. Replaces the unquoted characters "-", "+", "%", "‰", and
+     * "¤" with the corresponding symbols provided by the {@link SymbolProvider}, and inserts the
+     * result into the NumberStringBuilder at the requested location.
+     *
+     * <p>Example input: "'-'¤x"; example output: "-$x"
+     *
+     * @param affixPattern The original string to be unescaped.
+     * @param output The NumberStringBuilder to mutate with the result.
+     * @param position The index into the NumberStringBuilder to insert the string.
+     * @param provider An object to generate locale symbols.
+     */
+    static int32_t unescape(const UnicodeString& affixPattern, NumberStringBuilder& output,
+                            int32_t position, const SymbolProvider& provider, UErrorCode& status);
+
+    /**
+   * Sames as {@link #unescape}, but only calculates the code point count.  More efficient than {@link #unescape}
+   * if you only need the length but not the string itself.
+     *
+     * @param affixPattern The original string to be unescaped.
+     * @param provider An object to generate locale symbols.
+     * @return The same return value as if you called {@link #unescape}.
+     */
+    static int32_t unescapedCodePointCount(const UnicodeString& affixPattern,
+                                           const SymbolProvider& provider, UErrorCode& status);
+
+    /**
+     * Checks whether the given affix pattern contains at least one token of the given type, which is
+     * one of the constants "TYPE_" in {@link AffixPatternUtils}.
+     *
+     * @param affixPattern The affix pattern to check.
+     * @param type The token type.
+     * @return true if the affix pattern contains the given token type; false otherwise.
+     */
+    static bool containsType(const UnicodeString& affixPattern, AffixPatternType type, UErrorCode& status);
+
+    /**
+     * Checks whether the specified affix pattern has any unquoted currency symbols ("¤").
+     *
+     * @param affixPattern The string to check for currency symbols.
+     * @return true if the literal has at least one unquoted currency symbol; false otherwise.
+     */
+    static bool hasCurrencySymbols(const UnicodeString& affixPattern, UErrorCode& status);
+
+    /**
+     * Replaces all occurrences of tokens with the given type with the given replacement char.
+     *
+     * @param affixPattern The source affix pattern (does not get modified).
+     * @param type The token type.
+     * @param replacementChar The char to substitute in place of chars of the given token type.
+     * @return A string containing the new affix pattern.
+     */
+    static UnicodeString replaceType(const UnicodeString& affixPattern, AffixPatternType type,
+                                     char16_t replacementChar, UErrorCode& status);
+
+    /**
+     * Returns whether the given affix pattern contains only symbols and ignorables as defined by the
+     * given ignorables set.
+     */
+    static bool containsOnlySymbolsAndIgnorables(const UnicodeString& affixPattern,
+                                                 const UnicodeSet& ignorables, UErrorCode& status);
+
+    /**
+     * Iterates over the affix pattern, calling the TokenConsumer for each token.
+     */
+    static void iterateWithConsumer(const UnicodeString& affixPattern, TokenConsumer& consumer,
+                                    UErrorCode& status);
+
+    /**
+     * Returns the next token from the affix pattern.
+     *
+     * @param tag A bitmask used for keeping track of state from token to token. The initial value
+     *     should be 0L.
+     * @param patternString The affix pattern.
+     * @return The bitmask tag to pass to the next call of this method to retrieve the following token
+     *     (never negative), or -1 if there were no more tokens in the affix pattern.
+     * @see #hasNext
+     */
+    static AffixTag nextToken(AffixTag tag, const UnicodeString& patternString, UErrorCode& status);
+
+    /**
+     * Returns whether the affix pattern string has any more tokens to be retrieved from a call to
+     * {@link #nextToken}.
+     *
+     * @param tag The bitmask tag of the previous token, as returned by {@link #nextToken}.
+     * @param string The affix pattern.
+     * @return true if there are more tokens to consume; false otherwise.
+     */
+    static bool hasNext(const AffixTag& tag, const UnicodeString& string);
+
+  private:
+    /**
+     * Encodes the given values into a tag struct.
+     * The order of the arguments is consistent with Java, but the order of the stored
+     * fields is not necessarily the same.
+     */
+    static inline AffixTag makeTag(int32_t offset, AffixPatternType type, AffixPatternState state,
+                                   UChar32 cp) {
+        return {offset, cp, state, type};
+    }
+};
+
+} // namespace impl
+} // namespace number
+U_NAMESPACE_END
+
+
+#endif //__NUMBER_AFFIXUTILS_H__
+
+#endif /* #if !UCONFIG_NO_FORMATTING */