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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 NULL.
* @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 NULL.
* @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 NULL.
* @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 NULL.
* @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 NULL.
* @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 (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 >=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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