messagepattern.h

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/*
*******************************************************************************
*   Copyright (C) 2011-2012, International Business Machines
*   Corporation and others.  All Rights Reserved.
*******************************************************************************
*   file name:  messagepattern.h
*   encoding:   US-ASCII
*   tab size:   8 (not used)
*   indentation:4
*
*   created on: 2011mar14
*   created by: Markus W. Scherer
*/
 
#ifndef __MESSAGEPATTERN_H__
#define __MESSAGEPATTERN_H__

 
#include "unicode/utypes.h"
 
#if !UCONFIG_NO_FORMATTING
 
#include "unicode/parseerr.h"
#include "unicode/unistr.h"

enum UMessagePatternApostropheMode {
    UMSGPAT_APOS_DOUBLE_OPTIONAL,
    UMSGPAT_APOS_DOUBLE_REQUIRED
};

typedef enum UMessagePatternApostropheMode UMessagePatternApostropheMode;

enum UMessagePatternPartType {
    UMSGPAT_PART_TYPE_MSG_START,
    UMSGPAT_PART_TYPE_MSG_LIMIT,
    UMSGPAT_PART_TYPE_SKIP_SYNTAX,
    UMSGPAT_PART_TYPE_INSERT_CHAR,
    UMSGPAT_PART_TYPE_REPLACE_NUMBER,
    UMSGPAT_PART_TYPE_ARG_START,
    UMSGPAT_PART_TYPE_ARG_LIMIT,
    UMSGPAT_PART_TYPE_ARG_NUMBER,
    UMSGPAT_PART_TYPE_ARG_NAME,
    UMSGPAT_PART_TYPE_ARG_TYPE,
    UMSGPAT_PART_TYPE_ARG_STYLE,
    UMSGPAT_PART_TYPE_ARG_SELECTOR,
    UMSGPAT_PART_TYPE_ARG_INT,
    UMSGPAT_PART_TYPE_ARG_DOUBLE
};

typedef enum UMessagePatternPartType UMessagePatternPartType;

enum UMessagePatternArgType {
    UMSGPAT_ARG_TYPE_NONE,
    UMSGPAT_ARG_TYPE_SIMPLE,
    UMSGPAT_ARG_TYPE_CHOICE,
    UMSGPAT_ARG_TYPE_PLURAL,
    UMSGPAT_ARG_TYPE_SELECT,
    UMSGPAT_ARG_TYPE_SELECTORDINAL
};

typedef enum UMessagePatternArgType UMessagePatternArgType;

#define UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) \
    ((argType)==UMSGPAT_ARG_TYPE_PLURAL || (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL)
 
enum {
    UMSGPAT_ARG_NAME_NOT_NUMBER=-1,

    UMSGPAT_ARG_NAME_NOT_VALID=-2
};

#define UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789))
 
U_NAMESPACE_BEGIN
 
class MessagePatternDoubleList;
class MessagePatternPartsList;

class U_COMMON_API MessagePattern : public UObject {
public:
    MessagePattern(UErrorCode &errorCode);

    MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode);

    MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode);

    MessagePattern(const MessagePattern &other);

    MessagePattern &operator=(const MessagePattern &other);

    virtual ~MessagePattern();

    MessagePattern &parse(const UnicodeString &pattern,
                          UParseError *parseError, UErrorCode &errorCode);

    MessagePattern &parseChoiceStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

    MessagePattern &parsePluralStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

    MessagePattern &parseSelectStyle(const UnicodeString &pattern,
                                     UParseError *parseError, UErrorCode &errorCode);

    void clear();

    void clearPatternAndSetApostropheMode(UMessagePatternApostropheMode mode) {
        clear();
        aposMode=mode;
    }

    UBool operator==(const MessagePattern &other) const;

    inline UBool operator!=(const MessagePattern &other) const {
        return !operator==(other);
    }

    int32_t hashCode() const;

    UMessagePatternApostropheMode getApostropheMode() const {
        return aposMode;
    }
 
    // Java has package-private jdkAposMode() here.
    // In C++, this is declared in the MessageImpl class.

    const UnicodeString &getPatternString() const {
        return msg;
    }

    UBool hasNamedArguments() const {
        return hasArgNames;
    }

    UBool hasNumberedArguments() const {
        return hasArgNumbers;
    }

    static int32_t validateArgumentName(const UnicodeString &name);

    UnicodeString autoQuoteApostropheDeep() const;
 
    class Part;

    int32_t countParts() const {
        return partsLength;
    }

    const Part &getPart(int32_t i) const {
        return parts[i];
    }

    UMessagePatternPartType getPartType(int32_t i) const {
        return getPart(i).type;
    }

    int32_t getPatternIndex(int32_t partIndex) const {
        return getPart(partIndex).index;
    }

    UnicodeString getSubstring(const Part &part) const {
        return msg.tempSubString(part.index, part.length);
    }

    UBool partSubstringMatches(const Part &part, const UnicodeString &s) const {
        return 0==msg.compare(part.index, part.length, s);
    }

    double getNumericValue(const Part &part) const;

    double getPluralOffset(int32_t pluralStart) const;

    int32_t getLimitPartIndex(int32_t start) const {
        int32_t limit=getPart(start).limitPartIndex;
        if(limit<start) {
            return start;
        }
        return limit;
    }

    class Part : public UMemory {
    public:
        Part() {}

        UMessagePatternPartType getType() const {
            return type;
        }

        int32_t getIndex() const {
            return index;
        }

        int32_t getLength() const {
            return length;
        }

        int32_t getLimit() const {
            return index+length;
        }

        int32_t getValue() const {
            return value;
        }

        UMessagePatternArgType getArgType() const {
            UMessagePatternPartType type=getType();
            if(type==UMSGPAT_PART_TYPE_ARG_START || type==UMSGPAT_PART_TYPE_ARG_LIMIT) {
                return (UMessagePatternArgType)value;
            } else {
                return UMSGPAT_ARG_TYPE_NONE;
            }
        }

        static UBool hasNumericValue(UMessagePatternPartType type) {
            return type==UMSGPAT_PART_TYPE_ARG_INT || type==UMSGPAT_PART_TYPE_ARG_DOUBLE;
        }

        UBool operator==(const Part &other) const;

        inline UBool operator!=(const Part &other) const {
            return !operator==(other);
        }

        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);

    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);
    }

    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);

    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);

    UBool inMessageFormatPattern(int32_t nestingLevel);

    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);
 
    // No ICU "poor man's RTTI" for this class nor its subclasses.
    virtual UClassID getDynamicClassID() const;
 
    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  // __MESSAGEPATTERN_H__