name : messagepattern.h // © 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 &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. * <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 (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; // 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__