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// © 2016 and later: Unicode, Inc. and others. // License & terms of use: http://www.unicode.org/copyright.html /* ******************************************************************************* * Copyright (C) 2011-2013, International Business Machines * Corporation and others. All Rights Reserved. ******************************************************************************* * file name: messagepattern.h * encoding: UTF-8 * tab size: 8 (not used) * indentation:4 * * created on: 2011mar14 * created by: Markus W. Scherer / #ifndef __MESSAGEPATTERN_H__ #define __MESSAGEPATTERN_H__ /* * \file * \brief C++ API: MessagePattern class: Parses and represents ICU MessageFormat patterns. / #include "unicode/utypes.h" #if U_SHOW_CPLUSPLUS_API #if !UCONFIG_NO_FORMATTING #include "unicode/parseerr.h" #include "unicode/unistr.h" /* * Mode for when an apostrophe starts quoted literal text for MessageFormat output. * The default is DOUBLE_OPTIONAL unless overridden via uconfig.h * (UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE). * <p> * A pair of adjacent apostrophes always results in a single apostrophe in the output, * even when the pair is between two single, text-quoting apostrophes. * <p> * The following table shows examples of desired MessageFormat.format() output * with the pattern strings that yield that output. * <p> * <table> * <tr> * <th>Desired output</th> * <th>DOUBLE_OPTIONAL</th> * <th>DOUBLE_REQUIRED</th> * </tr> * <tr> * <td>I see {many}</td> * <td>I see '{many}'</td> * <td>(same)</td> * </tr> * <tr> * <td>I said {'Wow!'}</td> * <td>I said '{''Wow!''}'</td> * <td>(same)</td> * </tr> * <tr> * <td>I don't know</td> * <td>I don't know OR<br> I don''t know</td> * <td>I don''t know</td> * </tr> * </table> * @stable ICU 4.8 * @see UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE / enum UMessagePatternApostropheMode { /* * A literal apostrophe is represented by * either a single or a double apostrophe pattern character. * Within a MessageFormat pattern, a single apostrophe only starts quoted literal text * if it immediately precedes a curly brace {}, * or a pipe symbol \| if inside a choice format, * or a pound symbol # if inside a plural format. * <p> * This is the default behavior starting with ICU 4.8. * @stable ICU 4.8 / UMSGPAT_APOS_DOUBLE_OPTIONAL, /* * A literal apostrophe must be represented by * a double apostrophe pattern character. * A single apostrophe always starts quoted literal text. * <p> * This is the behavior of ICU 4.6 and earlier, and of the JDK. * @stable ICU 4.8 / UMSGPAT_APOS_DOUBLE_REQUIRED }; /* * @stable ICU 4.8 / typedef enum UMessagePatternApostropheMode UMessagePatternApostropheMode; /* * MessagePattern::Part type constants. * @stable ICU 4.8 / enum UMessagePatternPartType { /* * Start of a message pattern (main or nested). * The length is 0 for the top-level message * and for a choice argument sub-message, otherwise 1 for the '{'. * The value indicates the nesting level, starting with 0 for the main message. * <p> * There is always a later MSG_LIMIT part. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_MSG_START, /* * End of a message pattern (main or nested). * The length is 0 for the top-level message and * the last sub-message of a choice argument, * otherwise 1 for the '}' or (in a choice argument style) the '\|'. * The value indicates the nesting level, starting with 0 for the main message. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_MSG_LIMIT, /* * Indicates a substring of the pattern string which is to be skipped when formatting. * For example, an apostrophe that begins or ends quoted text * would be indicated with such a part. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_SKIP_SYNTAX, /* * Indicates that a syntax character needs to be inserted for auto-quoting. * The length is 0. * The value is the character code of the insertion character. (U+0027=APOSTROPHE) * @stable ICU 4.8 / UMSGPAT_PART_TYPE_INSERT_CHAR, /* * Indicates a syntactic (non-escaped) # symbol in a plural variant. * When formatting, replace this part's substring with the * (value-offset) for the plural argument value. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_REPLACE_NUMBER, /* * Start of an argument. * The length is 1 for the '{'. * The value is the ordinal value of the ArgType. Use getArgType(). * <p> * This part is followed by either an ARG_NUMBER or ARG_NAME, * followed by optional argument sub-parts (see UMessagePatternArgType constants) * and finally an ARG_LIMIT part. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_START, /* * End of an argument. * The length is 1 for the '}'. * The value is the ordinal value of the ArgType. Use getArgType(). * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_LIMIT, /* * The argument number, provided by the value. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_NUMBER, /* * The argument name. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_NAME, /* * The argument type. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_TYPE, /* * The argument style text. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_STYLE, /* * A selector substring in a "complex" argument style. * The value is undefined and currently always 0. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_SELECTOR, /* * An integer value, for example the offset or an explicit selector value * in a PluralFormat style. * The part value is the integer value. * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_INT, /* * A numeric value, for example the offset or an explicit selector value * in a PluralFormat style. * The part value is an index into an internal array of numeric values; * use getNumericValue(). * @stable ICU 4.8 / UMSGPAT_PART_TYPE_ARG_DOUBLE }; /* * @stable ICU 4.8 / typedef enum UMessagePatternPartType UMessagePatternPartType; /* * Argument type constants. * Returned by Part.getArgType() for ARG_START and ARG_LIMIT parts. * * Messages nested inside an argument are each delimited by MSG_START and MSG_LIMIT, * with a nesting level one greater than the surrounding message. * @stable ICU 4.8 / enum UMessagePatternArgType { /* * The argument has no specified type. * @stable ICU 4.8 / UMSGPAT_ARG_TYPE_NONE, /* * The argument has a "simple" type which is provided by the ARG_TYPE part. * An ARG_STYLE part might follow that. * @stable ICU 4.8 / UMSGPAT_ARG_TYPE_SIMPLE, /* * The argument is a ChoiceFormat with one or more * ((ARG_INT \| ARG_DOUBLE), ARG_SELECTOR, message) tuples. * @stable ICU 4.8 / UMSGPAT_ARG_TYPE_CHOICE, /* * The argument is a cardinal-number PluralFormat with an optional ARG_INT or ARG_DOUBLE offset * (e.g., offset:1) * and one or more (ARG_SELECTOR [explicit-value] message) tuples. * If the selector has an explicit value (e.g., =2), then * that value is provided by the ARG_INT or ARG_DOUBLE part preceding the message. * Otherwise the message immediately follows the ARG_SELECTOR. * @stable ICU 4.8 / UMSGPAT_ARG_TYPE_PLURAL, /* * The argument is a SelectFormat with one or more (ARG_SELECTOR, message) pairs. * @stable ICU 4.8 / UMSGPAT_ARG_TYPE_SELECT, /* * The argument is an ordinal-number PluralFormat * with the same style parts sequence and semantics as UMSGPAT_ARG_TYPE_PLURAL. * @stable ICU 50 / UMSGPAT_ARG_TYPE_SELECTORDINAL }; /* * @stable ICU 4.8 / typedef enum UMessagePatternArgType UMessagePatternArgType; /* * \def UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE * Returns true if the argument type has a plural style part sequence and semantics, * for example UMSGPAT_ARG_TYPE_PLURAL and UMSGPAT_ARG_TYPE_SELECTORDINAL. * @stable ICU 50 / #define UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) \ ((argType)==UMSGPAT_ARG_TYPE_PLURAL \|\| (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL) enum { /* * Return value from MessagePattern.validateArgumentName() for when * the string is a valid "pattern identifier" but not a number. * @stable ICU 4.8 / UMSGPAT_ARG_NAME_NOT_NUMBER=-1, /* * Return value from MessagePattern.validateArgumentName() for when * the string is invalid. * It might not be a valid "pattern identifier", * or it have only ASCII digits but there is a leading zero or the number is too large. * @stable ICU 4.8 / UMSGPAT_ARG_NAME_NOT_VALID=-2 }; /* * Special value that is returned by getNumericValue(Part) when no * numeric value is defined for a part. * @see MessagePattern.getNumericValue() * @stable ICU 4.8 / #define UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789)) U_NAMESPACE_BEGIN class MessagePatternDoubleList; class MessagePatternPartsList; /* * Parses and represents ICU MessageFormat patterns. * Also handles patterns for ChoiceFormat, PluralFormat and SelectFormat. * Used in the implementations of those classes as well as in tools * for message validation, translation and format conversion. * <p> * The parser handles all syntax relevant for identifying message arguments. * This includes "complex" arguments whose style strings contain * nested MessageFormat pattern substrings. * For "simple" arguments (with no nested MessageFormat pattern substrings), * the argument style is not parsed any further. * <p> * The parser handles named and numbered message arguments and allows both in one message. * <p> * Once a pattern has been parsed successfully, iterate through the parsed data * with countParts(), getPart() and related methods. * <p> * The data logically represents a parse tree, but is stored and accessed * as a list of "parts" for fast and simple parsing and to minimize object allocations. * Arguments and nested messages are best handled via recursion. * For every _START "part", MessagePattern.getLimitPartIndex() efficiently returns * the index of the corresponding _LIMIT "part". * <p> * List of "parts": * <pre> * message = MSG_START (SKIP_SYNTAX \| INSERT_CHAR \| REPLACE_NUMBER \| argument)* MSG_LIMIT * argument = noneArg \| simpleArg \| complexArg * complexArg = choiceArg \| pluralArg \| selectArg * * noneArg = ARG_START.NONE (ARG_NAME \| ARG_NUMBER) ARG_LIMIT.NONE * simpleArg = ARG_START.SIMPLE (ARG_NAME \| ARG_NUMBER) ARG_TYPE [ARG_STYLE] ARG_LIMIT.SIMPLE * choiceArg = ARG_START.CHOICE (ARG_NAME \| ARG_NUMBER) choiceStyle ARG_LIMIT.CHOICE * pluralArg = ARG_START.PLURAL (ARG_NAME \| ARG_NUMBER) pluralStyle ARG_LIMIT.PLURAL * selectArg = ARG_START.SELECT (ARG_NAME \| ARG_NUMBER) selectStyle ARG_LIMIT.SELECT * * choiceStyle = ((ARG_INT \| ARG_DOUBLE) ARG_SELECTOR message)+ * pluralStyle = [ARG_INT \| ARG_DOUBLE] (ARG_SELECTOR [ARG_INT \| ARG_DOUBLE] message)+ * selectStyle = (ARG_SELECTOR message)+ * </pre> * <ul> * <li>Literal output text is not represented directly by "parts" but accessed * between parts of a message, from one part's getLimit() to the next part's getIndex(). * <li><code>ARG_START.CHOICE</code> stands for an ARG_START Part with ArgType CHOICE. * <li>In the choiceStyle, the ARG_SELECTOR has the '<', the '#' or * the less-than-or-equal-to sign (U+2264). * <li>In the pluralStyle, the first, optional numeric Part has the "offset:" value. * The optional numeric Part between each (ARG_SELECTOR, message) pair * is the value of an explicit-number selector like "=2", * otherwise the selector is a non-numeric identifier. * <li>The REPLACE_NUMBER Part can occur only in an immediate sub-message of the pluralStyle. * </ul> * <p> * This class is not intended for public subclassing. * * @stable ICU 4.8 / class U_COMMON_API MessagePattern : public UObject { public: /* * Constructs an empty MessagePattern with default UMessagePatternApostropheMode. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @stable ICU 4.8 / MessagePattern(UErrorCode &errorCode); /* * Constructs an empty MessagePattern. * @param mode Explicit UMessagePatternApostropheMode. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @stable ICU 4.8 / MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode); /* * Constructs a MessagePattern with default UMessagePatternApostropheMode and * parses the MessageFormat pattern string. * @param pattern a MessageFormat pattern string * @param parseError Struct to receive information on the position * of an error within the pattern. * Can be nullptr. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * TODO: turn @throws into UErrorCode specifics? * @throws IllegalArgumentException for syntax errors in the pattern string * @throws IndexOutOfBoundsException if certain limits are exceeded * (e.g., argument number too high, argument name too long, etc.) * @throws NumberFormatException if a number could not be parsed * @stable ICU 4.8 / MessagePattern(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); /** * Copy constructor. * @param other Object to copy. * @stable ICU 4.8 / MessagePattern(const MessagePattern &other); /* * Assignment operator. * @param other Object to copy. * @return this=other @stable ICU 4.8 / MessagePattern &operator=(const MessagePattern &other); /* * Destructor. * @stable ICU 4.8 / virtual ~MessagePattern(); /* * Parses a MessageFormat pattern string. * @param pattern a MessageFormat pattern string * @param parseError Struct to receive information on the position * of an error within the pattern. * Can be nullptr. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @return this @throws IllegalArgumentException for syntax errors in the pattern string * @throws IndexOutOfBoundsException if certain limits are exceeded * (e.g., argument number too high, argument name too long, etc.) * @throws NumberFormatException if a number could not be parsed * @stable ICU 4.8 / MessagePattern &parse(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); /** * Parses a ChoiceFormat pattern string. * @param pattern a ChoiceFormat pattern string * @param parseError Struct to receive information on the position * of an error within the pattern. * Can be nullptr. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @return this @throws IllegalArgumentException for syntax errors in the pattern string * @throws IndexOutOfBoundsException if certain limits are exceeded * (e.g., argument number too high, argument name too long, etc.) * @throws NumberFormatException if a number could not be parsed * @stable ICU 4.8 / MessagePattern &parseChoiceStyle(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); /** * Parses a PluralFormat pattern string. * @param pattern a PluralFormat pattern string * @param parseError Struct to receive information on the position * of an error within the pattern. * Can be nullptr. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @return this @throws IllegalArgumentException for syntax errors in the pattern string * @throws IndexOutOfBoundsException if certain limits are exceeded * (e.g., argument number too high, argument name too long, etc.) * @throws NumberFormatException if a number could not be parsed * @stable ICU 4.8 / MessagePattern &parsePluralStyle(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); /** * Parses a SelectFormat pattern string. * @param pattern a SelectFormat pattern string * @param parseError Struct to receive information on the position * of an error within the pattern. * Can be nullptr. * @param errorCode Standard ICU error code. Its input value must * pass the U_SUCCESS() test, or else the function returns * immediately. Check for U_FAILURE() on output or use with * function chaining. (See User Guide for details.) * @return this @throws IllegalArgumentException for syntax errors in the pattern string * @throws IndexOutOfBoundsException if certain limits are exceeded * (e.g., argument number too high, argument name too long, etc.) * @throws NumberFormatException if a number could not be parsed * @stable ICU 4.8 / MessagePattern &parseSelectStyle(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); /** * Clears this MessagePattern. * countParts() will return 0. * @stable ICU 4.8 / void clear(); /* * Clears this MessagePattern and sets the UMessagePatternApostropheMode. * countParts() will return 0. * @param mode The new UMessagePatternApostropheMode. * @stable ICU 4.8 / void clearPatternAndSetApostropheMode(UMessagePatternApostropheMode mode) { clear(); aposMode=mode; } /* * @param other another object to compare with. * @return true if this object is equivalent to the other one. * @stable ICU 4.8 / bool operator==(const MessagePattern &other) const; /* * @param other another object to compare with. * @return false if this object is equivalent to the other one. * @stable ICU 4.8 / inline bool operator!=(const MessagePattern &other) const { return !operator==(other); } /* * @return A hash code for this object. * @stable ICU 4.8 / int32_t hashCode() const; /* * @return this instance's UMessagePatternApostropheMode. * @stable ICU 4.8 / UMessagePatternApostropheMode getApostropheMode() const { return aposMode; } // Java has package-private jdkAposMode() here. // In C++, this is declared in the MessageImpl class. /* * @return the parsed pattern string (null if none was parsed). * @stable ICU 4.8 / const UnicodeString &getPatternString() const { return msg; } /* * Does the parsed pattern have named arguments like {first_name}? * @return true if the parsed pattern has at least one named argument. * @stable ICU 4.8 / UBool hasNamedArguments() const { return hasArgNames; } /* * Does the parsed pattern have numbered arguments like {2}? * @return true if the parsed pattern has at least one numbered argument. * @stable ICU 4.8 / UBool hasNumberedArguments() const { return hasArgNumbers; } /* * Validates and parses an argument name or argument number string. * An argument name must be a "pattern identifier", that is, it must contain * no Unicode Pattern_Syntax or Pattern_White_Space characters. * If it only contains ASCII digits, then it must be a small integer with no leading zero. * @param name Input string. * @return >=0 if the name is a valid number, * ARG_NAME_NOT_NUMBER (-1) if it is a "pattern identifier" but not all ASCII digits, * ARG_NAME_NOT_VALID (-2) if it is neither. * @stable ICU 4.8 / static int32_t validateArgumentName(const UnicodeString &name); /* * Returns a version of the parsed pattern string where each ASCII apostrophe * is doubled (escaped) if it is not already, and if it is not interpreted as quoting syntax. * <p> * For example, this turns "I don't '{know}' {gender,select,female{h''er}other{h'im}}." * into "I don''t '{know}' {gender,select,female{h''er}other{h''im}}." * @return the deep-auto-quoted version of the parsed pattern string. * @see MessageFormat.autoQuoteApostrophe() * @stable ICU 4.8 / UnicodeString autoQuoteApostropheDeep() const; class Part; /* * Returns the number of "parts" created by parsing the pattern string. * Returns 0 if no pattern has been parsed or clear() was called. * @return the number of pattern parts. * @stable ICU 4.8 / int32_t countParts() const { return partsLength; } /* * Gets the i-th pattern "part". * @param i The index of the Part data. (0..countParts()-1) * @return the i-th pattern "part". * @stable ICU 4.8 / const Part &getPart(int32_t i) const { return parts[i]; } /* * Returns the UMessagePatternPartType of the i-th pattern "part". * Convenience method for getPart(i).getType(). * @param i The index of the Part data. (0..countParts()-1) * @return The UMessagePatternPartType of the i-th Part. * @stable ICU 4.8 / UMessagePatternPartType getPartType(int32_t i) const { return getPart(i).type; } /* * Returns the pattern index of the specified pattern "part". * Convenience method for getPart(partIndex).getIndex(). * @param partIndex The index of the Part data. (0..countParts()-1) * @return The pattern index of this Part. * @stable ICU 4.8 / int32_t getPatternIndex(int32_t partIndex) const { return getPart(partIndex).index; } /* * Returns the substring of the pattern string indicated by the Part. * Convenience method for getPatternString().substring(part.getIndex(), part.getLimit()). * @param part a part of this MessagePattern. * @return the substring associated with part. * @stable ICU 4.8 / UnicodeString getSubstring(const Part &part) const { return msg.tempSubString(part.index, part.length); } /* * Compares the part's substring with the input string s. * @param part a part of this MessagePattern. * @param s a string. * @return true if getSubstring(part).equals(s). * @stable ICU 4.8 / UBool partSubstringMatches(const Part &part, const UnicodeString &s) const { return 0==msg.compare(part.index, part.length, s); } /* * Returns the numeric value associated with an ARG_INT or ARG_DOUBLE. * @param part a part of this MessagePattern. * @return the part's numeric value, or UMSGPAT_NO_NUMERIC_VALUE if this is not a numeric part. * @stable ICU 4.8 / double getNumericValue(const Part &part) const; /* * Returns the "offset:" value of a PluralFormat argument, or 0 if none is specified. * @param pluralStart the index of the first PluralFormat argument style part. (0..countParts()-1) * @return the "offset:" value. * @stable ICU 4.8 / double getPluralOffset(int32_t pluralStart) const; /* * Returns the index of the ARG\|MSG_LIMIT part corresponding to the ARG\|MSG_START at start. * @param start The index of some Part data (0..countParts()-1); * this Part should be of Type ARG_START or MSG_START. * @return The first i>start where getPart(i).getType()==ARG\|MSG_LIMIT at the same nesting level, * or start itself if getPartType(msgStart)!=ARG\|MSG_START. * @stable ICU 4.8 / int32_t getLimitPartIndex(int32_t start) const { int32_t limit=getPart(start).limitPartIndex; if(limit<start) { return start; } return limit; } /* * A message pattern "part", representing a pattern parsing event. * There is a part for the start and end of a message or argument, * for quoting and escaping of and with ASCII apostrophes, * and for syntax elements of "complex" arguments. * @stable ICU 4.8 / class Part : public UMemory { public: /* * Default constructor, do not use. * @internal / Part() {} /* * Returns the type of this part. * @return the part type. * @stable ICU 4.8 / UMessagePatternPartType getType() const { return type; } /* * Returns the pattern string index associated with this Part. * @return this part's pattern string index. * @stable ICU 4.8 / int32_t getIndex() const { return index; } /* * Returns the length of the pattern substring associated with this Part. * This is 0 for some parts. * @return this part's pattern substring length. * @stable ICU 4.8 / int32_t getLength() const { return length; } /* * Returns the pattern string limit (exclusive-end) index associated with this Part. * Convenience method for getIndex()+getLength(). * @return this part's pattern string limit index, same as getIndex()+getLength(). * @stable ICU 4.8 / int32_t getLimit() const { return index+length; } /* * Returns a value associated with this part. * See the documentation of each part type for details. * @return the part value. * @stable ICU 4.8 / int32_t getValue() const { return value; } /* * Returns the argument type if this part is of type ARG_START or ARG_LIMIT, * otherwise UMSGPAT_ARG_TYPE_NONE. * @return the argument type for this part. * @stable ICU 4.8 / UMessagePatternArgType getArgType() const { UMessagePatternPartType msgType=getType(); if(msgType ==UMSGPAT_PART_TYPE_ARG_START \|\| msgType ==UMSGPAT_PART_TYPE_ARG_LIMIT) { return static_cast<UMessagePatternArgType>(value); } else { return UMSGPAT_ARG_TYPE_NONE; } } /* * Indicates whether the Part type has a numeric value. * If so, then that numeric value can be retrieved via MessagePattern.getNumericValue(). * @param type The Part type to be tested. * @return true if the Part type has a numeric value. * @stable ICU 4.8 / static UBool hasNumericValue(UMessagePatternPartType type) { return type==UMSGPAT_PART_TYPE_ARG_INT \|\| type==UMSGPAT_PART_TYPE_ARG_DOUBLE; } /* * @param other another object to compare with. * @return true if this object is equivalent to the other one. * @stable ICU 4.8 / bool operator==(const Part &other) const; /* * @param other another object to compare with. * @return false if this object is equivalent to the other one. * @stable ICU 4.8 / inline bool operator!=(const Part &other) const { return !operator==(other); } /* * @return A hash code for this object. * @stable ICU 4.8 / int32_t hashCode() const { return ((type37+index)37+length)37+value; } private: friend class MessagePattern; static const int32_t MAX_LENGTH=0xffff; static const int32_t MAX_VALUE=0x7fff; static const int32_t MAX_NESTED_LEVELS=0x03ff; // Some fields are not final because they are modified during pattern parsing. // After pattern parsing, the parts are effectively immutable. UMessagePatternPartType type; int32_t index; uint16_t length; int16_t value; int32_t limitPartIndex; }; private: void preParse(const UnicodeString &pattern, UParseError parseError, UErrorCode &errorCode); void postParse(); int32_t parseMessage(int32_t index, int32_t msgStartLength, int32_t nestingLevel, UMessagePatternArgType parentType, UParseError parseError, UErrorCode &errorCode); int32_t parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel, UParseError parseError, UErrorCode &errorCode); int32_t parseSimpleStyle(int32_t index, UParseError parseError, UErrorCode &errorCode); int32_t parseChoiceStyle(int32_t index, int32_t nestingLevel, UParseError parseError, UErrorCode &errorCode); int32_t parsePluralOrSelectStyle(UMessagePatternArgType argType, int32_t index, int32_t nestingLevel, UParseError parseError, UErrorCode &errorCode); /** * Validates and parses an argument name or argument number string. * This internal method assumes that the input substring is a "pattern identifier". * @return >=0 if the name is a valid number, * ARG_NAME_NOT_NUMBER (-1) if it is a "pattern identifier" but not all ASCII digits, * ARG_NAME_NOT_VALID (-2) if it is neither. * @see #validateArgumentName(String) / static int32_t parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit); int32_t parseArgNumber(int32_t start, int32_t limit) { return parseArgNumber(msg, start, limit); } /* * Parses a number from the specified message substring. * @param start start index into the message string * @param limit limit index into the message string, must be start<limit * @param allowInfinity true if U+221E is allowed (for ChoiceFormat) * @param parseError * @param errorCode / void parseDouble(int32_t start, int32_t limit, UBool allowInfinity, UParseError parseError, UErrorCode &errorCode); // Java has package-private appendReducedApostrophes() here. // In C++, this is declared in the MessageImpl class. int32_t skipWhiteSpace(int32_t index); int32_t skipIdentifier(int32_t index); /** * Skips a sequence of characters that could occur in a double value. * Does not fully parse or validate the value. / int32_t skipDouble(int32_t index); static UBool isArgTypeChar(UChar32 c); UBool isChoice(int32_t index); UBool isPlural(int32_t index); UBool isSelect(int32_t index); UBool isOrdinal(int32_t index); /* * @return true if we are inside a MessageFormat (sub-)pattern, * as opposed to inside a top-level choice/plural/select pattern. / UBool inMessageFormatPattern(int32_t nestingLevel); /* * @return true if we are in a MessageFormat sub-pattern * of a top-level ChoiceFormat pattern. / UBool inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType); void addPart(UMessagePatternPartType type, int32_t index, int32_t length, int32_t value, UErrorCode &errorCode); void addLimitPart(int32_t start, UMessagePatternPartType type, int32_t index, int32_t length, int32_t value, UErrorCode &errorCode); void addArgDoublePart(double numericValue, int32_t start, int32_t length, UErrorCode &errorCode); void setParseError(UParseError parseError, int32_t index); UBool init(UErrorCode &errorCode); UBool copyStorage(const MessagePattern &other, UErrorCode &errorCode); UMessagePatternApostropheMode aposMode; UnicodeString msg; // ArrayList<Part> parts=new ArrayList<Part>(); MessagePatternPartsList partsList; Part parts; int32_t partsLength; // ArrayList<Double> numericValues; MessagePatternDoubleList numericValuesList; double numericValues; int32_t numericValuesLength; UBool hasArgNames; UBool hasArgNumbers; UBool needsAutoQuoting; }; U_NAMESPACE_END #endif // !UCONFIG_NO_FORMATTING #endif /* U_SHOW_CPLUSPLUS_API */ #endif // __MESSAGEPATTERN_H__ Back

Edit File : messagepattern.h | Size : 33.79 KB

// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
*******************************************************************************
*   Copyright (C) 2011-2013, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  messagepattern.h
*   encoding:   UTF-8
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2011mar14
*   created by: Markus W. Scherer
*/

#ifndef __MESSAGEPATTERN_H__
#define __MESSAGEPATTERN_H__

/**
 * \file
 * \brief C++ API: MessagePattern class: Parses and represents ICU MessageFormat patterns.
 */

#include "unicode/utypes.h"

#if U_SHOW_CPLUSPLUS_API

#if !UCONFIG_NO_FORMATTING

#include "unicode/parseerr.h"
#include "unicode/unistr.h"

/**
 * Mode for when an apostrophe starts quoted literal text for MessageFormat output.
 * The default is DOUBLE_OPTIONAL unless overridden via uconfig.h
 * (UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE).
 * 
 * A pair of adjacent apostrophes always results in a single apostrophe in the output,
 * even when the pair is between two single, text-quoting apostrophes.
 * 
 * The following table shows examples of desired MessageFormat.format() output
 * with the pattern strings that yield that output.
 * 
 * <table>
 * <tr>
 * <th>Desired output</th>
 * <th>DOUBLE_OPTIONAL</th>
 * <th>DOUBLE_REQUIRED</th>
 * </tr>
 * <tr>
 * <td>I see {many}</td>
 * <td>I see '{many}'</td>
 * <td>(same)</td>
 * </tr>
 * <tr>
 * <td>I said {'Wow!'}</td>
 * <td>I said '{''Wow!''}'</td>
 * <td>(same)</td>
 * </tr>
 * <tr>
 * <td>I don't know</td>
 * <td>I don't know OR I don''t know</td>
 * <td>I don''t know</td>
 * </tr>
 * </table>
 * @stable ICU 4.8
 * @see UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE
 */
enum UMessagePatternApostropheMode {
 /**
 * A literal apostrophe is represented by
 * either a single or a double apostrophe pattern character.
 * Within a MessageFormat pattern, a single apostrophe only starts quoted literal text
 * if it immediately precedes a curly brace {},
 * or a pipe symbol | if inside a choice format,
 * or a pound symbol # if inside a plural format.
 * 
 * This is the default behavior starting with ICU 4.8.
 * @stable ICU 4.8
 */
 UMSGPAT_APOS_DOUBLE_OPTIONAL,
 /**
 * A literal apostrophe must be represented by
 * a double apostrophe pattern character.
 * A single apostrophe always starts quoted literal text.
 * 
 * This is the behavior of ICU 4.6 and earlier, and of the JDK.
 * @stable ICU 4.8
 */
 UMSGPAT_APOS_DOUBLE_REQUIRED
};
/**
 * @stable ICU 4.8
 */
typedef enum UMessagePatternApostropheMode UMessagePatternApostropheMode;

/**
 * MessagePattern::Part type constants.
 * @stable ICU 4.8
 */
enum UMessagePatternPartType {
 /**
 * Start of a message pattern (main or nested).
 * The length is 0 for the top-level message
 * and for a choice argument sub-message, otherwise 1 for the '{'.
 * The value indicates the nesting level, starting with 0 for the main message.
 * 
 * There is always a later MSG_LIMIT part.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_MSG_START,
 /**
 * End of a message pattern (main or nested).
 * The length is 0 for the top-level message and
 * the last sub-message of a choice argument,
 * otherwise 1 for the '}' or (in a choice argument style) the '|'.
 * The value indicates the nesting level, starting with 0 for the main message.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_MSG_LIMIT,
 /**
 * Indicates a substring of the pattern string which is to be skipped when formatting.
 * For example, an apostrophe that begins or ends quoted text
 * would be indicated with such a part.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_SKIP_SYNTAX,
 /**
 * Indicates that a syntax character needs to be inserted for auto-quoting.
 * The length is 0.
 * The value is the character code of the insertion character. (U+0027=APOSTROPHE)
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_INSERT_CHAR,
 /**
 * Indicates a syntactic (non-escaped) # symbol in a plural variant.
 * When formatting, replace this part's substring with the
 * (value-offset) for the plural argument value.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_REPLACE_NUMBER,
 /**
 * Start of an argument.
 * The length is 1 for the '{'.
 * The value is the ordinal value of the ArgType. Use getArgType().
 * 
 * This part is followed by either an ARG_NUMBER or ARG_NAME,
 * followed by optional argument sub-parts (see UMessagePatternArgType constants)
 * and finally an ARG_LIMIT part.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_START,
 /**
 * End of an argument.
 * The length is 1 for the '}'.
 * The value is the ordinal value of the ArgType. Use getArgType().
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_LIMIT,
 /**
 * The argument number, provided by the value.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_NUMBER,
 /**
 * The argument name.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_NAME,
 /**
 * The argument type.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_TYPE,
 /**
 * The argument style text.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_STYLE,
 /**
 * A selector substring in a "complex" argument style.
 * The value is undefined and currently always 0.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_SELECTOR,
 /**
 * An integer value, for example the offset or an explicit selector value
 * in a PluralFormat style.
 * The part value is the integer value.
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_INT,
 /**
 * A numeric value, for example the offset or an explicit selector value
 * in a PluralFormat style.
 * The part value is an index into an internal array of numeric values;
 * use getNumericValue().
 * @stable ICU 4.8
 */
 UMSGPAT_PART_TYPE_ARG_DOUBLE
};
/**
 * @stable ICU 4.8
 */
typedef enum UMessagePatternPartType UMessagePatternPartType;

/**
 * Argument type constants.
 * Returned by Part.getArgType() for ARG_START and ARG_LIMIT parts.
 *
 * Messages nested inside an argument are each delimited by MSG_START and MSG_LIMIT,
 * with a nesting level one greater than the surrounding message.
 * @stable ICU 4.8
 */
enum UMessagePatternArgType {
    /**
     * The argument has no specified type.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_TYPE_NONE,
    /**
     * The argument has a "simple" type which is provided by the ARG_TYPE part.
     * An ARG_STYLE part might follow that.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_TYPE_SIMPLE,
    /**
     * The argument is a ChoiceFormat with one or more
     * ((ARG_INT | ARG_DOUBLE), ARG_SELECTOR, message) tuples.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_TYPE_CHOICE,
    /**
     * The argument is a cardinal-number PluralFormat with an optional ARG_INT or ARG_DOUBLE offset
     * (e.g., offset:1)
     * and one or more (ARG_SELECTOR [explicit-value] message) tuples.
     * If the selector has an explicit value (e.g., =2), then
     * that value is provided by the ARG_INT or ARG_DOUBLE part preceding the message.
     * Otherwise the message immediately follows the ARG_SELECTOR.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_TYPE_PLURAL,
    /**
     * The argument is a SelectFormat with one or more (ARG_SELECTOR, message) pairs.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_TYPE_SELECT,
    /**
     * The argument is an ordinal-number PluralFormat
     * with the same style parts sequence and semantics as UMSGPAT_ARG_TYPE_PLURAL.
     * @stable ICU 50
     */
    UMSGPAT_ARG_TYPE_SELECTORDINAL
};
/**
 * @stable ICU 4.8
 */
typedef enum UMessagePatternArgType UMessagePatternArgType;

/**
 * \def UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE
 * Returns true if the argument type has a plural style part sequence and semantics,
 * for example UMSGPAT_ARG_TYPE_PLURAL and UMSGPAT_ARG_TYPE_SELECTORDINAL.
 * @stable ICU 50
 */
#define UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) \
    ((argType)==UMSGPAT_ARG_TYPE_PLURAL || (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL)

enum {
    /**
     * Return value from MessagePattern.validateArgumentName() for when
     * the string is a valid "pattern identifier" but not a number.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_NAME_NOT_NUMBER=-1,

/**
     * Return value from MessagePattern.validateArgumentName() for when
     * the string is invalid.
     * It might not be a valid "pattern identifier",
     * or it have only ASCII digits but there is a leading zero or the number is too large.
     * @stable ICU 4.8
     */
    UMSGPAT_ARG_NAME_NOT_VALID=-2
};

/**
 * Special value that is returned by getNumericValue(Part) when no
 * numeric value is defined for a part.
 * @see MessagePattern.getNumericValue()
 * @stable ICU 4.8
 */
#define UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789))

U_NAMESPACE_BEGIN

class MessagePatternDoubleList;
class MessagePatternPartsList;

/**
 * Parses and represents ICU MessageFormat patterns.
 * Also handles patterns for ChoiceFormat, PluralFormat and SelectFormat.
 * Used in the implementations of those classes as well as in tools
 * for message validation, translation and format conversion.
 * 
 * The parser handles all syntax relevant for identifying message arguments.
 * This includes "complex" arguments whose style strings contain
 * nested MessageFormat pattern substrings.
 * For "simple" arguments (with no nested MessageFormat pattern substrings),
 * the argument style is not parsed any further.
 * 
 * The parser handles named and numbered message arguments and allows both in one message.
 * 
 * Once a pattern has been parsed successfully, iterate through the parsed data
 * with countParts(), getPart() and related methods.
 * 
 * The data logically represents a parse tree, but is stored and accessed
 * as a list of "parts" for fast and simple parsing and to minimize object allocations.
 * Arguments and nested messages are best handled via recursion.
 * For every _START "part", MessagePattern.getLimitPartIndex() efficiently returns
 * the index of the corresponding _LIMIT "part".
 * 
 * List of "parts":
 * <pre>
 * message = MSG_START (SKIP_SYNTAX | INSERT_CHAR | REPLACE_NUMBER | argument)* MSG_LIMIT
 * argument = noneArg | simpleArg | complexArg
 * complexArg = choiceArg | pluralArg | selectArg
 *
 * noneArg = ARG_START.NONE (ARG_NAME | ARG_NUMBER) ARG_LIMIT.NONE
 * simpleArg = ARG_START.SIMPLE (ARG_NAME | ARG_NUMBER) ARG_TYPE [ARG_STYLE] ARG_LIMIT.SIMPLE
 * choiceArg = ARG_START.CHOICE (ARG_NAME | ARG_NUMBER) choiceStyle ARG_LIMIT.CHOICE
 * pluralArg = ARG_START.PLURAL (ARG_NAME | ARG_NUMBER) pluralStyle ARG_LIMIT.PLURAL
 * selectArg = ARG_START.SELECT (ARG_NAME | ARG_NUMBER) selectStyle ARG_LIMIT.SELECT
 *
 * choiceStyle = ((ARG_INT | ARG_DOUBLE) ARG_SELECTOR message)+
 * pluralStyle = [ARG_INT | ARG_DOUBLE] (ARG_SELECTOR [ARG_INT | ARG_DOUBLE] message)+
 * selectStyle = (ARG_SELECTOR message)+
 * </pre>
 * <ul>
 * <li>Literal output text is not represented directly by "parts" but accessed
 * between parts of a message, from one part's getLimit() to the next part's getIndex().
 * <li><code>ARG_START.CHOICE</code> stands for an ARG_START Part with ArgType CHOICE.
 * <li>In the choiceStyle, the ARG_SELECTOR has the '<', the '#' or
 * the less-than-or-equal-to sign (U+2264).
 * <li>In the pluralStyle, the first, optional numeric Part has the "offset:" value.
 * The optional numeric Part between each (ARG_SELECTOR, message) pair
 * is the value of an explicit-number selector like "=2",
 * otherwise the selector is a non-numeric identifier.
 * <li>The REPLACE_NUMBER Part can occur only in an immediate sub-message of the pluralStyle.
 * </ul>
 * 
 * This class is not intended for public subclassing.
 *
 * @stable ICU 4.8
 */
class U_COMMON_API MessagePattern : public UObject {
public:
 /**
 * Constructs an empty MessagePattern with default UMessagePatternApostropheMode.
 * @param errorCode Standard ICU error code. Its input value must
 * pass the U_SUCCESS() test, or else the function returns
 * immediately. Check for U_FAILURE() on output or use with
 * function chaining. (See User Guide for details.)
 * @stable ICU 4.8
 */
 MessagePattern(UErrorCode &errorCode);

/**
     * Constructs an empty MessagePattern.
     * @param mode Explicit UMessagePatternApostropheMode.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @stable ICU 4.8
     */
    MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode);

/**
     * Constructs a MessagePattern with default UMessagePatternApostropheMode and
     * parses the MessageFormat pattern string.
     * @param pattern a MessageFormat pattern string
     * @param parseError Struct to receive information on the position
     *                   of an error within the pattern.
     *                   Can be nullptr.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * TODO: turn @throws into UErrorCode specifics?
     * @throws IllegalArgumentException for syntax errors in the pattern string
     * @throws IndexOutOfBoundsException if certain limits are exceeded
     *         (e.g., argument number too high, argument name too long, etc.)
     * @throws NumberFormatException if a number could not be parsed
     * @stable ICU 4.8
     */
    MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode);

/**
     * Copy constructor.
     * @param other Object to copy.
     * @stable ICU 4.8
     */
    MessagePattern(const MessagePattern &other);

/**
     * Assignment operator.
     * @param other Object to copy.
     * @return *this=other
     * @stable ICU 4.8
     */
    MessagePattern &operator=(const MessagePattern &other);

/**
     * Destructor.
     * @stable ICU 4.8
     */
    virtual ~MessagePattern();

/**
     * Parses a MessageFormat pattern string.
     * @param pattern a MessageFormat pattern string
     * @param parseError Struct to receive information on the position
     *                   of an error within the pattern.
     *                   Can be nullptr.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @throws IllegalArgumentException for syntax errors in the pattern string
     * @throws IndexOutOfBoundsException if certain limits are exceeded
     *         (e.g., argument number too high, argument name too long, etc.)
     * @throws NumberFormatException if a number could not be parsed
     * @stable ICU 4.8
     */
    MessagePattern &parse(const UnicodeString &pattern,
                          UParseError *parseError, UErrorCode &errorCode);

/**
     * Parses a ChoiceFormat pattern string.
     * @param pattern a ChoiceFormat pattern string
     * @param parseError Struct to receive information on the position
     *                   of an error within the pattern.
     *                   Can be nullptr.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @throws IllegalArgumentException for syntax errors in the pattern string
     * @throws IndexOutOfBoundsException if certain limits are exceeded
     *         (e.g., argument number too high, argument name too long, etc.)
     * @throws NumberFormatException if a number could not be parsed
     * @stable ICU 4.8
     */
    MessagePattern &parseChoiceStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

/**
     * Parses a PluralFormat pattern string.
     * @param pattern a PluralFormat pattern string
     * @param parseError Struct to receive information on the position
     *                   of an error within the pattern.
     *                   Can be nullptr.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @throws IllegalArgumentException for syntax errors in the pattern string
     * @throws IndexOutOfBoundsException if certain limits are exceeded
     *         (e.g., argument number too high, argument name too long, etc.)
     * @throws NumberFormatException if a number could not be parsed
     * @stable ICU 4.8
     */
    MessagePattern &parsePluralStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

/**
     * Parses a SelectFormat pattern string.
     * @param pattern a SelectFormat pattern string
     * @param parseError Struct to receive information on the position
     *                   of an error within the pattern.
     *                   Can be nullptr.
     * @param errorCode Standard ICU error code. Its input value must
     *                  pass the U_SUCCESS() test, or else the function returns
     *                  immediately. Check for U_FAILURE() on output or use with
     *                  function chaining. (See User Guide for details.)
     * @return *this
     * @throws IllegalArgumentException for syntax errors in the pattern string
     * @throws IndexOutOfBoundsException if certain limits are exceeded
     *         (e.g., argument number too high, argument name too long, etc.)
     * @throws NumberFormatException if a number could not be parsed
     * @stable ICU 4.8
     */
    MessagePattern &parseSelectStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

/**
     * Clears this MessagePattern.
     * countParts() will return 0.
     * @stable ICU 4.8
     */
    void clear();

/**
     * Clears this MessagePattern and sets the UMessagePatternApostropheMode.
     * countParts() will return 0.
     * @param mode The new UMessagePatternApostropheMode.
     * @stable ICU 4.8
     */
    void clearPatternAndSetApostropheMode(UMessagePatternApostropheMode mode) {
        clear();
        aposMode=mode;
    }

/**
     * @param other another object to compare with.
     * @return true if this object is equivalent to the other one.
     * @stable ICU 4.8
     */
    bool operator==(const MessagePattern &other) const;

/**
     * @param other another object to compare with.
     * @return false if this object is equivalent to the other one.
     * @stable ICU 4.8
     */
    inline bool operator!=(const MessagePattern &other) const {
        return !operator==(other);
    }

/**
     * @return A hash code for this object.
     * @stable ICU 4.8
     */
    int32_t hashCode() const;

/**
     * @return this instance's UMessagePatternApostropheMode.
     * @stable ICU 4.8
     */
    UMessagePatternApostropheMode getApostropheMode() const {
        return aposMode;
    }

// Java has package-private jdkAposMode() here.
    // In C++, this is declared in the MessageImpl class.

/**
     * @return the parsed pattern string (null if none was parsed).
     * @stable ICU 4.8
     */
    const UnicodeString &getPatternString() const {
        return msg;
    }

/**
     * Does the parsed pattern have named arguments like {first_name}?
     * @return true if the parsed pattern has at least one named argument.
     * @stable ICU 4.8
     */
    UBool hasNamedArguments() const {
        return hasArgNames;
    }

/**
     * Does the parsed pattern have numbered arguments like {2}?
     * @return true if the parsed pattern has at least one numbered argument.
     * @stable ICU 4.8
     */
    UBool hasNumberedArguments() const {
        return hasArgNumbers;
    }

/**
     * Validates and parses an argument name or argument number string.
     * An argument name must be a "pattern identifier", that is, it must contain
     * no Unicode Pattern_Syntax or Pattern_White_Space characters.
     * If it only contains ASCII digits, then it must be a small integer with no leading zero.
     * @param name Input string.
     * @return &gt;=0 if the name is a valid number,
     *         ARG_NAME_NOT_NUMBER (-1) if it is a "pattern identifier" but not all ASCII digits,
     *         ARG_NAME_NOT_VALID (-2) if it is neither.
     * @stable ICU 4.8
     */
    static int32_t validateArgumentName(const UnicodeString &name);

/**
 * Returns a version of the parsed pattern string where each ASCII apostrophe
 * is doubled (escaped) if it is not already, and if it is not interpreted as quoting syntax.
 * 
 * For example, this turns "I don't '{know}' {gender,select,female{h''er}other{h'im}}."
 * into "I don''t '{know}' {gender,select,female{h''er}other{h''im}}."
 * @return the deep-auto-quoted version of the parsed pattern string.
 * @see MessageFormat.autoQuoteApostrophe()
 * @stable ICU 4.8
 */
 UnicodeString autoQuoteApostropheDeep() const;

class Part;

/**
     * Returns the number of "parts" created by parsing the pattern string.
     * Returns 0 if no pattern has been parsed or clear() was called.
     * @return the number of pattern parts.
     * @stable ICU 4.8
     */
    int32_t countParts() const {
        return partsLength;
    }

/**
     * Gets the i-th pattern "part".
     * @param i The index of the Part data. (0..countParts()-1)
     * @return the i-th pattern "part".
     * @stable ICU 4.8
     */
    const Part &getPart(int32_t i) const {
        return parts[i];
    }

/**
     * Returns the UMessagePatternPartType of the i-th pattern "part".
     * Convenience method for getPart(i).getType().
     * @param i The index of the Part data. (0..countParts()-1)
     * @return The UMessagePatternPartType of the i-th Part.
     * @stable ICU 4.8
     */
    UMessagePatternPartType getPartType(int32_t i) const {
        return getPart(i).type;
    }

/**
     * Returns the pattern index of the specified pattern "part".
     * Convenience method for getPart(partIndex).getIndex().
     * @param partIndex The index of the Part data. (0..countParts()-1)
     * @return The pattern index of this Part.
     * @stable ICU 4.8
     */
    int32_t getPatternIndex(int32_t partIndex) const {
        return getPart(partIndex).index;
    }

/**
     * Returns the substring of the pattern string indicated by the Part.
     * Convenience method for getPatternString().substring(part.getIndex(), part.getLimit()).
     * @param part a part of this MessagePattern.
     * @return the substring associated with part.
     * @stable ICU 4.8
     */
    UnicodeString getSubstring(const Part &part) const {
        return msg.tempSubString(part.index, part.length);
    }

/**
     * Compares the part's substring with the input string s.
     * @param part a part of this MessagePattern.
     * @param s a string.
     * @return true if getSubstring(part).equals(s).
     * @stable ICU 4.8
     */
    UBool partSubstringMatches(const Part &part, const UnicodeString &s) const {
        return 0==msg.compare(part.index, part.length, s);
    }

/**
     * Returns the numeric value associated with an ARG_INT or ARG_DOUBLE.
     * @param part a part of this MessagePattern.
     * @return the part's numeric value, or UMSGPAT_NO_NUMERIC_VALUE if this is not a numeric part.
     * @stable ICU 4.8
     */
    double getNumericValue(const Part &part) const;

/**
     * Returns the "offset:" value of a PluralFormat argument, or 0 if none is specified.
     * @param pluralStart the index of the first PluralFormat argument style part. (0..countParts()-1)
     * @return the "offset:" value.
     * @stable ICU 4.8
     */
    double getPluralOffset(int32_t pluralStart) const;

/**
 * Returns the index of the ARG|MSG_LIMIT part corresponding to the ARG|MSG_START at start.
 * @param start The index of some Part data (0..countParts()-1);
 * this Part should be of Type ARG_START or MSG_START.
 * @return The first i>start where getPart(i).getType()==ARG|MSG_LIMIT at the same nesting level,
 * or start itself if getPartType(msgStart)!=ARG|MSG_START.
 * @stable ICU 4.8
 */
 int32_t getLimitPartIndex(int32_t start) const {
 int32_t limit=getPart(start).limitPartIndex;
 if(limit<start) {
 return start;
 }
 return limit;
 }

/**
     * A message pattern "part", representing a pattern parsing event.
     * There is a part for the start and end of a message or argument,
     * for quoting and escaping of and with ASCII apostrophes,
     * and for syntax elements of "complex" arguments.
     * @stable ICU 4.8
     */
    class Part : public UMemory {
    public:
        /**
         * Default constructor, do not use.
         * @internal
         */
        Part() {}

/**
         * Returns the type of this part.
         * @return the part type.
         * @stable ICU 4.8
         */
        UMessagePatternPartType getType() const {
            return type;
        }

/**
         * Returns the pattern string index associated with this Part.
         * @return this part's pattern string index.
         * @stable ICU 4.8
         */
        int32_t getIndex() const {
            return index;
        }

/**
         * Returns the length of the pattern substring associated with this Part.
         * This is 0 for some parts.
         * @return this part's pattern substring length.
         * @stable ICU 4.8
         */
        int32_t getLength() const {
            return length;
        }

/**
         * Returns the pattern string limit (exclusive-end) index associated with this Part.
         * Convenience method for getIndex()+getLength().
         * @return this part's pattern string limit index, same as getIndex()+getLength().
         * @stable ICU 4.8
         */
        int32_t getLimit() const {
            return index+length;
        }

/**
         * Returns a value associated with this part.
         * See the documentation of each part type for details.
         * @return the part value.
         * @stable ICU 4.8
         */
        int32_t getValue() const {
            return value;
        }

/**
 * Returns the argument type if this part is of type ARG_START or ARG_LIMIT,
 * otherwise UMSGPAT_ARG_TYPE_NONE.
 * @return the argument type for this part.
 * @stable ICU 4.8
 */
 UMessagePatternArgType getArgType() const {
 UMessagePatternPartType msgType=getType();
 if(msgType ==UMSGPAT_PART_TYPE_ARG_START || msgType ==UMSGPAT_PART_TYPE_ARG_LIMIT) {
 return static_cast<UMessagePatternArgType>(value);
 } else {
 return UMSGPAT_ARG_TYPE_NONE;
 }
 }

/**
         * Indicates whether the Part type has a numeric value.
         * If so, then that numeric value can be retrieved via MessagePattern.getNumericValue().
         * @param type The Part type to be tested.
         * @return true if the Part type has a numeric value.
         * @stable ICU 4.8
         */
        static UBool hasNumericValue(UMessagePatternPartType type) {
            return type==UMSGPAT_PART_TYPE_ARG_INT || type==UMSGPAT_PART_TYPE_ARG_DOUBLE;
        }

/**
         * @param other another object to compare with.
         * @return true if this object is equivalent to the other one.
         * @stable ICU 4.8
         */
        bool operator==(const Part &other) const;

/**
         * @param other another object to compare with.
         * @return false if this object is equivalent to the other one.
         * @stable ICU 4.8
         */
        inline bool operator!=(const Part &other) const {
            return !operator==(other);
        }

/**
         * @return A hash code for this object.
         * @stable ICU 4.8
         */
        int32_t hashCode() const {
            return ((type*37+index)*37+length)*37+value;
        }

private:
        friend class MessagePattern;

static const int32_t MAX_LENGTH=0xffff;
        static const int32_t MAX_VALUE=0x7fff;
        static const int32_t MAX_NESTED_LEVELS=0x03ff;

// Some fields are not final because they are modified during pattern parsing.
        // After pattern parsing, the parts are effectively immutable.
        UMessagePatternPartType type;
        int32_t index;
        uint16_t length;
        int16_t value;
        int32_t limitPartIndex;
    };

private:
    void preParse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode);

void postParse();

int32_t parseMessage(int32_t index, int32_t msgStartLength,
                         int32_t nestingLevel, UMessagePatternArgType parentType,
                         UParseError *parseError, UErrorCode &errorCode);

int32_t parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel,
                     UParseError *parseError, UErrorCode &errorCode);

int32_t parseSimpleStyle(int32_t index, UParseError *parseError, UErrorCode &errorCode);

int32_t parseChoiceStyle(int32_t index, int32_t nestingLevel,
                             UParseError *parseError, UErrorCode &errorCode);

int32_t parsePluralOrSelectStyle(UMessagePatternArgType argType, int32_t index, int32_t nestingLevel,
                                     UParseError *parseError, UErrorCode &errorCode);

/**
     * Validates and parses an argument name or argument number string.
     * This internal method assumes that the input substring is a "pattern identifier".
     * @return &gt;=0 if the name is a valid number,
     *         ARG_NAME_NOT_NUMBER (-1) if it is a "pattern identifier" but not all ASCII digits,
     *         ARG_NAME_NOT_VALID (-2) if it is neither.
     * @see #validateArgumentName(String)
     */
    static int32_t parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit);

int32_t parseArgNumber(int32_t start, int32_t limit) {
        return parseArgNumber(msg, start, limit);
    }

/**
 * Parses a number from the specified message substring.
 * @param start start index into the message string
 * @param limit limit index into the message string, must be start<limit
 * @param allowInfinity true if U+221E is allowed (for ChoiceFormat)
 * @param parseError
 * @param errorCode
 */
 void parseDouble(int32_t start, int32_t limit, UBool allowInfinity,
 UParseError *parseError, UErrorCode &errorCode);

// Java has package-private appendReducedApostrophes() here.
    // In C++, this is declared in the MessageImpl class.

int32_t skipWhiteSpace(int32_t index);

int32_t skipIdentifier(int32_t index);

/**
     * Skips a sequence of characters that could occur in a double value.
     * Does not fully parse or validate the value.
     */
    int32_t skipDouble(int32_t index);

static UBool isArgTypeChar(UChar32 c);

UBool isChoice(int32_t index);

UBool isPlural(int32_t index);

UBool isSelect(int32_t index);

UBool isOrdinal(int32_t index);

/**
     * @return true if we are inside a MessageFormat (sub-)pattern,
     *         as opposed to inside a top-level choice/plural/select pattern.
     */
    UBool inMessageFormatPattern(int32_t nestingLevel);

/**
     * @return true if we are in a MessageFormat sub-pattern
     *         of a top-level ChoiceFormat pattern.
     */
    UBool inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType);

void addPart(UMessagePatternPartType type, int32_t index, int32_t length,
                 int32_t value, UErrorCode &errorCode);

void addLimitPart(int32_t start,
                      UMessagePatternPartType type, int32_t index, int32_t length,
                      int32_t value, UErrorCode &errorCode);

void addArgDoublePart(double numericValue, int32_t start, int32_t length, UErrorCode &errorCode);

void setParseError(UParseError *parseError, int32_t index);

UBool init(UErrorCode &errorCode);
    UBool copyStorage(const MessagePattern &other, UErrorCode &errorCode);

UMessagePatternApostropheMode aposMode;
 UnicodeString msg;
 // ArrayList<Part> parts=new ArrayList<Part>();
 MessagePatternPartsList *partsList;
 Part *parts;
 int32_t partsLength;
 // ArrayList<Double> numericValues;
 MessagePatternDoubleList *numericValuesList;
 double *numericValues;
 int32_t numericValuesLength;
 UBool hasArgNames;
 UBool hasArgNumbers;
 UBool needsAutoQuoting;
};

U_NAMESPACE_END

#endif  // !UCONFIG_NO_FORMATTING

#endif /* U_SHOW_CPLUSPLUS_API */

#endif  // __MESSAGEPATTERN_H__

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