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+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+* Copyright (C) 2015, International Business Machines
+* Corporation and others.  All Rights Reserved.
+*******************************************************************************
+* affixpatternparser.h
+*
+* created on: 2015jan06
+* created by: Travis Keep
+*/
+
+#ifndef __AFFIX_PATTERN_PARSER_H__
+#define __AFFIX_PATTERN_PARSER_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/unistr.h"
+#include "unicode/uobject.h"
+#include "pluralaffix.h"
+
+U_NAMESPACE_BEGIN
+
+class PluralRules;
+class FixedPrecision;
+class DecimalFormatSymbols;
+
+/**
+ * A representation of the various forms of a particular currency according
+ * to some locale and usage context.
+ * 
+ * Includes the symbol, ISO code form, and long form(s) of the currency name
+ * for each plural variation.
+ */
+class U_I18N_API CurrencyAffixInfo : public UMemory {
+public:
+    /**
+     * Symbol is \u00a4; ISO form is \u00a4\u00a4;
+     *  long form is \u00a4\u00a4\u00a4.
+     */
+    CurrencyAffixInfo();
+
+    const UnicodeString &getSymbol() const { return fSymbol; }
+    const UnicodeString &getISO() const { return fISO; }
+    const PluralAffix &getLong() const { return fLong; }
+    void setSymbol(const UnicodeString &symbol) {
+        fSymbol = symbol;
+        fIsDefault = FALSE;
+    }
+    void setISO(const UnicodeString &iso) {
+        fISO = iso;
+        fIsDefault = FALSE;
+    }
+    UBool
+    equals(const CurrencyAffixInfo &other) const {
+        return (fSymbol == other.fSymbol)
+                && (fISO == other.fISO)
+                && (fLong.equals(other.fLong))
+                && (fIsDefault == other.fIsDefault);
+    }
+
+    /**
+     * Intializes this instance.
+     *
+     * @param locale the locale for the currency forms.
+     * @param rules The plural rules for the locale. 
+     * @param currency the null terminated, 3 character ISO code of the
+     * currency. If NULL, resets this instance as if it were just created.
+     * In this case, the first 2 parameters may be NULL as well.
+     * @param status any error returned here.
+     */
+    void set(
+            const char *locale, const PluralRules *rules,
+            const UChar *currency, UErrorCode &status);
+
+    /**
+     * Returns true if this instance is the default. That is has no real
+     * currency. For instance never initialized with set()
+     * or reset with set(NULL, NULL, NULL, status).
+     */
+    UBool isDefault() const { return fIsDefault; }
+
+    /**
+     * Adjusts the precision used for a particular currency.
+     * @param currency the null terminated, 3 character ISO code of the
+     * currency.
+     * @param usage the usage of the currency
+     * @param precision min/max fraction digits and rounding increment
+     *  adjusted.
+     * @params status any error reported here.
+     */
+    static void adjustPrecision(
+            const UChar *currency, const UCurrencyUsage usage,
+            FixedPrecision &precision, UErrorCode &status);
+
+private:
+    /**
+     * The symbol form of the currency.
+     */
+    UnicodeString fSymbol;
+
+    /**
+     * The ISO form of the currency, usually three letter abbreviation.
+     */
+    UnicodeString fISO;
+
+    /**
+     * The long forms of the currency keyed by plural variation.
+     */
+    PluralAffix fLong;
+
+    UBool fIsDefault;
+
+};
+
+class AffixPatternIterator;
+
+/**
+ * A locale agnostic representation of an affix pattern.
+ */
+class U_I18N_API AffixPattern : public UMemory {
+public:
+
+    /**
+     * The token types that can appear in an affix pattern.
+     */
+    enum ETokenType {
+        kLiteral,
+        kPercent,
+        kPerMill,
+        kCurrency,
+        kNegative,
+        kPositive
+    };
+
+    /**
+     * An empty affix pattern.
+     */
+    AffixPattern()
+            : tokens(), literals(), hasCurrencyToken(FALSE),
+              hasPercentToken(FALSE), hasPermillToken(FALSE),  char32Count(0) {
+    }
+
+    /**
+     * Adds a string literal to this affix pattern.
+     */
+    void addLiteral(const UChar *, int32_t start, int32_t len);
+
+    /**
+     * Adds a token to this affix pattern. t must not be kLiteral as
+     * the addLiteral() method adds literals. 
+     * @param t the token type to add
+     */
+    void add(ETokenType t);
+
+    /**
+     * Adds a currency token with specific count to this affix pattern.
+     * @param count the token count. Used to distinguish between
+     *  one, two, or three currency symbols. Note that adding a currency
+     *  token with count=2 (Use ISO code) is different than adding two
+     *  currency tokens each with count=1 (two currency symbols).
+     */
+    void addCurrency(uint8_t count);
+
+    /**
+     * Makes this instance be an empty affix pattern.
+     */
+    void remove();
+
+    /**
+     * Provides an iterator over the tokens in this instance.
+     * @param result this is initialized to point just before the
+     *   first token of this instance. Caller must call nextToken()
+     *   on the iterator once it is set up to have it actually point
+     *   to the first token. This first call to nextToken() will return
+     *   FALSE if the AffixPattern being iterated over is empty.
+     * @return result
+     */
+    AffixPatternIterator &iterator(AffixPatternIterator &result) const;
+
+    /**
+     * Returns TRUE if this instance has currency tokens in it.
+     */
+    UBool usesCurrency() const {
+        return hasCurrencyToken;
+    }
+
+    UBool usesPercent() const {
+        return hasPercentToken;
+    }
+
+    UBool usesPermill() const {
+        return hasPermillToken;
+    }
+
+    /**
+     * Returns the number of code points a string of this instance
+     * would have if none of the special tokens were escaped.
+     * Used to compute the padding size.
+     */
+    int32_t countChar32() const {
+        return char32Count;
+    }
+
+    /**
+     * Appends other to this instance mutating this instance in place.
+     * @param other The pattern appended to the end of this one.
+     * @return a reference to this instance for chaining.
+     */
+    AffixPattern &append(const AffixPattern &other);
+
+    /**
+     * Converts this AffixPattern back into a user string.
+     * It is the inverse of parseUserAffixString.
+     */
+    UnicodeString &toUserString(UnicodeString &appendTo) const;
+
+    /**
+     * Converts this AffixPattern back into a string.
+     * It is the inverse of parseAffixString.
+     */
+    UnicodeString &toString(UnicodeString &appendTo) const;
+
+    /**
+     * Parses an affix pattern string appending it to an AffixPattern.
+     * Parses affix pattern strings produced from using
+     * DecimalFormatPatternParser to parse a format pattern. Affix patterns
+     * include the positive prefix and suffix and the negative prefix
+     * and suffix. This method expects affix patterns strings to be in the
+     * same format that DecimalFormatPatternParser produces. Namely special
+     * characters in the affix that correspond to a field type must be
+     * prefixed with an apostrophe ('). These special character sequences
+     * inluce minus (-), percent (%), permile (U+2030), plus (+),
+     * short currency (U+00a4), medium currency (u+00a4 * 2),
+     * long currency (u+a4 * 3), and apostrophe (')
+     * (apostrophe does not correspond to a field type but has to be escaped
+     * because it itself is the escape character).
+     * Since the expansion of these special character
+     * sequences is locale dependent, these sequences are not expanded in
+     * an AffixPattern instance.
+     * If these special characters are not prefixed with an apostrophe in
+     * the affix pattern string, then they are treated verbatim just as
+     * any other character. If an apostrophe prefixes a non special
+     * character in the affix pattern, the apostrophe is simply ignored.
+     *
+     * @param affixStr the string from DecimalFormatPatternParser
+     * @param appendTo parsed result appended here.
+     * @param status any error parsing returned here.
+     */
+    static AffixPattern &parseAffixString(
+            const UnicodeString &affixStr,
+            AffixPattern &appendTo,
+            UErrorCode &status);
+
+    /**
+     * Parses an affix pattern string appending it to an AffixPattern.
+     * Parses affix pattern strings as the user would supply them.
+     * In this function, quoting makes special characters like normal
+     * characters whereas in parseAffixString, quoting makes special
+     * characters special.
+     *
+     * @param affixStr the string from the user
+     * @param appendTo parsed result appended here.
+     * @param status any error parsing returned here.
+     */
+    static AffixPattern &parseUserAffixString(
+            const UnicodeString &affixStr,
+            AffixPattern &appendTo,
+            UErrorCode &status);
+
+    UBool equals(const AffixPattern &other) const {
+        return (tokens == other.tokens)
+                && (literals == other.literals)
+                && (hasCurrencyToken == other.hasCurrencyToken)
+                && (hasPercentToken == other.hasPercentToken)
+                && (hasPermillToken == other.hasPermillToken)
+                && (char32Count == other.char32Count);
+    }
+
+private:
+    /*
+     * Tokens stored here. Each UChar generally stands for one token. A
+     * Each token is of form 'etttttttllllllll' llllllll is the length of
+     * the token and ranges from 0-255. ttttttt is the token type and ranges
+     * from 0-127. If e is set it means this is an extendo token (to be
+     * described later). To accomodate token lengths above 255, each normal
+     * token (e=0) can be followed by 0 or more extendo tokens (e=1) with
+     * the same type. Right now only kLiteral Tokens have extendo tokens.
+     * Each extendo token provides the next 8 higher bits for the length.
+     * If a kLiteral token is followed by 2 extendo tokens then, then the
+     * llllllll of the next extendo token contains bits 8-15 of the length
+     * and the last extendo token contains bits 16-23 of the length.
+     */
+    UnicodeString tokens;
+
+    /*
+     * The characters of the kLiteral tokens are concatenated together here.
+     * The first characters go with the first kLiteral token, the next
+     * characters go with the next kLiteral token etc.
+     */
+    UnicodeString literals;
+    UBool hasCurrencyToken;
+    UBool hasPercentToken;
+    UBool hasPermillToken;
+    int32_t char32Count;
+    void add(ETokenType t, uint8_t count);
+
+};
+
+/**
+ * An iterator over the tokens in an AffixPattern instance.
+ */
+class U_I18N_API AffixPatternIterator : public UMemory {
+public:
+
+    /**
+     * Using an iterator without first calling iterator on an AffixPattern
+     * instance to initialize the iterator results in
+     * undefined behavior.
+     */
+    AffixPatternIterator() : nextLiteralIndex(0), lastLiteralLength(0), nextTokenIndex(0), tokens(NULL), literals(NULL) { }
+    /**
+     * Advances this iterator to the next token. Returns FALSE when there
+     * are no more tokens. Calling the other methods after nextToken()
+     * returns FALSE results in undefined behavior.
+     */ 
+    UBool nextToken();
+
+    /**
+     * Returns the type of token.
+     */
+    AffixPattern::ETokenType getTokenType() const;
+
+    /**
+     * For literal tokens, returns the literal string. Calling this for
+     * other token types results in undefined behavior.
+     * @param result replaced with a read-only alias to the literal string.
+     * @return result
+     */
+    UnicodeString &getLiteral(UnicodeString &result) const;
+
+    /**
+     * Returns the token length. Usually 1, but for currency tokens may
+     * be 2 for ISO code and 3 for long form.
+     */
+    int32_t getTokenLength() const;
+private:
+    int32_t nextLiteralIndex;
+    int32_t lastLiteralLength;
+    int32_t nextTokenIndex;
+    const UnicodeString *tokens;
+    const UnicodeString *literals;
+    friend class AffixPattern;
+    AffixPatternIterator(const AffixPatternIterator &);
+    AffixPatternIterator &operator=(const AffixPatternIterator &);
+};
+
+/**
+ * A locale aware class that converts locale independent AffixPattern
+ * instances into locale dependent PluralAffix instances.
+ */
+class U_I18N_API AffixPatternParser : public UMemory {
+public:
+AffixPatternParser();
+AffixPatternParser(const DecimalFormatSymbols &symbols);
+void setDecimalFormatSymbols(const DecimalFormatSymbols &symbols);
+
+/**
+ * Parses affixPattern appending the result to appendTo.
+ * @param affixPattern The affix pattern.
+ * @param currencyAffixInfo contains the currency forms.
+ * @param appendTo The result of parsing affixPattern is appended here.
+ * @param status any error returned here.
+ * @return appendTo.
+ */
+PluralAffix &parse(
+        const AffixPattern &affixPattern,
+        const CurrencyAffixInfo &currencyAffixInfo,
+        PluralAffix &appendTo,
+        UErrorCode &status) const;
+
+UBool equals(const AffixPatternParser &other) const {
+    return (fPercent == other.fPercent)
+            && (fPermill == other.fPermill)
+            && (fNegative == other.fNegative)
+            && (fPositive == other.fPositive);
+}
+
+private:
+UnicodeString fPercent;
+UnicodeString fPermill;
+UnicodeString fNegative;
+UnicodeString fPositive;
+};
+
+
+U_NAMESPACE_END
+#endif /* #if !UCONFIG_NO_FORMATTING */
+#endif  // __AFFIX_PATTERN_PARSER_H__