ICU 75.1 75.1

messagepattern.h
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1 // © 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /*
4 *******************************************************************************
5 * Copyright (C) 2011-2013, International Business Machines
6 * Corporation and others. All Rights Reserved.
7 *******************************************************************************
8 * file name: messagepattern.h
9 * encoding: UTF-8
10 * tab size: 8 (not used)
11 * indentation:4
12 *
13 * created on: 2011mar14
14 * created by: Markus W. Scherer
15 */
16
17 #ifndef __MESSAGEPATTERN_H__
18 #define __MESSAGEPATTERN_H__
19
25 #include "unicode/utypes.h"
26
27 #if U_SHOW_CPLUSPLUS_API
28
29 #if !UCONFIG_NO_FORMATTING
30
31 #include "unicode/parseerr.h"
32 #include "unicode/unistr.h"
33
70 enum UMessagePatternApostropheMode {
82 UMSGPAT_APOS_DOUBLE_OPTIONAL,
91 UMSGPAT_APOS_DOUBLE_REQUIRED
92 };
96 typedef enum UMessagePatternApostropheMode UMessagePatternApostropheMode;
97
102 enum UMessagePatternPartType {
112 UMSGPAT_PART_TYPE_MSG_START,
121 UMSGPAT_PART_TYPE_MSG_LIMIT,
129 UMSGPAT_PART_TYPE_SKIP_SYNTAX,
136 UMSGPAT_PART_TYPE_INSERT_CHAR,
144 UMSGPAT_PART_TYPE_REPLACE_NUMBER,
155 UMSGPAT_PART_TYPE_ARG_START,
162 UMSGPAT_PART_TYPE_ARG_LIMIT,
167 UMSGPAT_PART_TYPE_ARG_NUMBER,
173 UMSGPAT_PART_TYPE_ARG_NAME,
179 UMSGPAT_PART_TYPE_ARG_TYPE,
185 UMSGPAT_PART_TYPE_ARG_STYLE,
191 UMSGPAT_PART_TYPE_ARG_SELECTOR,
198 UMSGPAT_PART_TYPE_ARG_INT,
206 UMSGPAT_PART_TYPE_ARG_DOUBLE
207 };
211 typedef enum UMessagePatternPartType UMessagePatternPartType;
212
221 enum UMessagePatternArgType {
226 UMSGPAT_ARG_TYPE_NONE,
232 UMSGPAT_ARG_TYPE_SIMPLE,
238 UMSGPAT_ARG_TYPE_CHOICE,
248 UMSGPAT_ARG_TYPE_PLURAL,
253 UMSGPAT_ARG_TYPE_SELECT,
259 UMSGPAT_ARG_TYPE_SELECTORDINAL
260 };
264 typedef enum UMessagePatternArgType UMessagePatternArgType;
265
272 #define UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) \
273 ((argType)==UMSGPAT_ARG_TYPE_PLURAL || (argType)==UMSGPAT_ARG_TYPE_SELECTORDINAL)
274
275 enum {
281 UMSGPAT_ARG_NAME_NOT_NUMBER=-1,
282
290 UMSGPAT_ARG_NAME_NOT_VALID=-2
291 };
292
299 #define UMSGPAT_NO_NUMERIC_VALUE ((double)(-123456789))
300
301 U_NAMESPACE_BEGIN
302
303 class MessagePatternDoubleList;
304 class MessagePatternPartsList;
305
362 class U_COMMON_API MessagePattern : public UObject {
363 public:
372 MessagePattern(UErrorCode &errorCode);
373
383 MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode);
384
403 MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode);
404
410 MessagePattern(const MessagePattern &other);
411
418 MessagePattern &operator=(const MessagePattern &other);
419
424 virtual ~MessagePattern();
425
443 MessagePattern &parse(const UnicodeString &pattern,
444 UParseError *parseError, UErrorCode &errorCode);
445
463 MessagePattern &parseChoiceStyle(const UnicodeString &pattern,
464 UParseError *parseError, UErrorCode &errorCode);
465
483 MessagePattern &parsePluralStyle(const UnicodeString &pattern,
484 UParseError *parseError, UErrorCode &errorCode);
485
503 MessagePattern &parseSelectStyle(const UnicodeString &pattern,
504 UParseError *parseError, UErrorCode &errorCode);
505
511 void clear();
512
519 void clearPatternAndSetApostropheMode(UMessagePatternApostropheMode mode) {
520 clear();
521 aposMode=mode;
522 }
523
529 bool operator==(const MessagePattern &other) const;
530
536 inline bool operator!=(const MessagePattern &other) const {
537 return !operator==(other);
538 }
539
544 int32_t hashCode() const;
545
550 UMessagePatternApostropheMode getApostropheMode() const {
551 return aposMode;
552 }
553
554 // Java has package-private jdkAposMode() here.
555 // In C++, this is declared in the MessageImpl class.
556
561 const UnicodeString &getPatternString() const {
562 return msg;
563 }
564
570 UBool hasNamedArguments() const {
571 return hasArgNames;
572 }
573
579 UBool hasNumberedArguments() const {
580 return hasArgNumbers;
581 }
582
594 static int32_t validateArgumentName(const UnicodeString &name);
595
606 UnicodeString autoQuoteApostropheDeep() const;
607
608 class Part;
609
616 int32_t countParts() const {
617 return partsLength;
618 }
619
626 const Part &getPart(int32_t i) const {
627 return parts[i];
628 }
629
637 UMessagePatternPartType getPartType(int32_t i) const {
638 return getPart(i).type;
639 }
640
648 int32_t getPatternIndex(int32_t partIndex) const {
649 return getPart(partIndex).index;
650 }
651
659 UnicodeString getSubstring(const Part &part) const {
660 return msg.tempSubString(part.index, part.length);
661 }
662
670 UBool partSubstringMatches(const Part &part, const UnicodeString &s) const {
671 return 0==msg.compare(part.index, part.length, s);
672 }
673
680 double getNumericValue(const Part &part) const;
681
688 double getPluralOffset(int32_t pluralStart) const;
689
698 int32_t getLimitPartIndex(int32_t start) const {
699 int32_t limit=getPart(start).limitPartIndex;
700 if(limit<start) {
701 return start;
702 }
703 return limit;
704 }
705
713 class Part : public UMemory {
714 public:
719 Part() {}
720
726 UMessagePatternPartType getType() const {
727 return type;
728 }
729
735 int32_t getIndex() const {
736 return index;
737 }
738
745 int32_t getLength() const {
746 return length;
747 }
748
755 int32_t getLimit() const {
756 return index+length;
757 }
758
765 int32_t getValue() const {
766 return value;
767 }
768
775 UMessagePatternArgType getArgType() const {
776 UMessagePatternPartType msgType=getType();
777 if(msgType ==UMSGPAT_PART_TYPE_ARG_START || msgType ==UMSGPAT_PART_TYPE_ARG_LIMIT) {
778 return (UMessagePatternArgType)value;
779 } else {
780 return UMSGPAT_ARG_TYPE_NONE;
781 }
782 }
783
791 static UBool hasNumericValue(UMessagePatternPartType type) {
792 return type==UMSGPAT_PART_TYPE_ARG_INT || type==UMSGPAT_PART_TYPE_ARG_DOUBLE;
793 }
794
800 bool operator==(const Part &other) const;
801
807 inline bool operator!=(const Part &other) const {
808 return !operator==(other);
809 }
810
815 int32_t hashCode() const {
816 return ((type*37+index)*37+length)*37+value;
817 }
818
819 private:
820 friend class MessagePattern;
821
822 static const int32_t MAX_LENGTH=0xffff;
823 static const int32_t MAX_VALUE=0x7fff;
824
825 // Some fields are not final because they are modified during pattern parsing.
826 // After pattern parsing, the parts are effectively immutable.
827 UMessagePatternPartType type;
828 int32_t index;
829 uint16_t length;
830 int16_t value;
831 int32_t limitPartIndex;
832 };
833
834 private:
835 void preParse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode);
836
837 void postParse();
838
839 int32_t parseMessage(int32_t index, int32_t msgStartLength,
840 int32_t nestingLevel, UMessagePatternArgType parentType,
841 UParseError *parseError, UErrorCode &errorCode);
842
843 int32_t parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel,
844 UParseError *parseError, UErrorCode &errorCode);
845
846 int32_t parseSimpleStyle(int32_t index, UParseError *parseError, UErrorCode &errorCode);
847
848 int32_t parseChoiceStyle(int32_t index, int32_t nestingLevel,
849 UParseError *parseError, UErrorCode &errorCode);
850
851 int32_t parsePluralOrSelectStyle(UMessagePatternArgType argType, int32_t index, int32_t nestingLevel,
852 UParseError *parseError, UErrorCode &errorCode);
853
862 static int32_t parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit);
863
864 int32_t parseArgNumber(int32_t start, int32_t limit) {
865 return parseArgNumber(msg, start, limit);
866 }
867
876 void parseDouble(int32_t start, int32_t limit, UBool allowInfinity,
877 UParseError *parseError, UErrorCode &errorCode);
878
879 // Java has package-private appendReducedApostrophes() here.
880 // In C++, this is declared in the MessageImpl class.
881
882 int32_t skipWhiteSpace(int32_t index);
883
884 int32_t skipIdentifier(int32_t index);
885
890 int32_t skipDouble(int32_t index);
891
892 static UBool isArgTypeChar(UChar32 c);
893
894 UBool isChoice(int32_t index);
895
896 UBool isPlural(int32_t index);
897
898 UBool isSelect(int32_t index);
899
900 UBool isOrdinal(int32_t index);
901
906 UBool inMessageFormatPattern(int32_t nestingLevel);
907
912 UBool inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType);
913
914 void addPart(UMessagePatternPartType type, int32_t index, int32_t length,
915 int32_t value, UErrorCode &errorCode);
916
917 void addLimitPart(int32_t start,
918 UMessagePatternPartType type, int32_t index, int32_t length,
919 int32_t value, UErrorCode &errorCode);
920
921 void addArgDoublePart(double numericValue, int32_t start, int32_t length, UErrorCode &errorCode);
922
923 void setParseError(UParseError *parseError, int32_t index);
924
925 UBool init(UErrorCode &errorCode);
926 UBool copyStorage(const MessagePattern &other, UErrorCode &errorCode);
927
928 UMessagePatternApostropheMode aposMode;
929 UnicodeString msg;
930 // ArrayList<Part> parts=new ArrayList<Part>();
931 MessagePatternPartsList *partsList;
932 Part *parts;
933 int32_t partsLength;
934 // ArrayList<Double> numericValues;
935 MessagePatternDoubleList *numericValuesList;
936 double *numericValues;
937 int32_t numericValuesLength;
938 UBool hasArgNames;
939 UBool hasArgNumbers;
940 UBool needsAutoQuoting;
941 };
942
943 U_NAMESPACE_END
944
945 #endif // !UCONFIG_NO_FORMATTING
946
947 #endif /* U_SHOW_CPLUSPLUS_API */
948
949 #endif // __MESSAGEPATTERN_H__
icu::MessagePattern::Part
A message pattern "part", representing a pattern parsing event.
Definition: messagepattern.h:713
icu::MessagePattern::Part::operator==
bool operator==(const Part &other) const
icu::MessagePattern::Part::getArgType
UMessagePatternArgType getArgType() const
Returns the argument type if this part is of type ARG_START or ARG_LIMIT, otherwise UMSGPAT_ARG_TYPE_...
Definition: messagepattern.h:775
icu::MessagePattern::Part::hashCode
int32_t hashCode() const
Definition: messagepattern.h:815
icu::MessagePattern::Part::getIndex
int32_t getIndex() const
Returns the pattern string index associated with this Part.
Definition: messagepattern.h:735
icu::MessagePattern::Part::getValue
int32_t getValue() const
Returns a value associated with this part.
Definition: messagepattern.h:765
icu::MessagePattern::Part::operator!=
bool operator!=(const Part &other) const
Definition: messagepattern.h:807
icu::MessagePattern::Part::getType
UMessagePatternPartType getType() const
Returns the type of this part.
Definition: messagepattern.h:726
icu::MessagePattern::Part::getLength
int32_t getLength() const
Returns the length of the pattern substring associated with this Part.
Definition: messagepattern.h:745
icu::MessagePattern::Part::getLimit
int32_t getLimit() const
Returns the pattern string limit (exclusive-end) index associated with this Part.
Definition: messagepattern.h:755
icu::MessagePattern::Part::hasNumericValue
static UBool hasNumericValue(UMessagePatternPartType type)
Indicates whether the Part type has a numeric value.
Definition: messagepattern.h:791
icu::MessagePattern::Part::Part
Part()
Default constructor, do not use.
Definition: messagepattern.h:719
icu::MessagePattern
Parses and represents ICU MessageFormat patterns.
Definition: messagepattern.h:362
icu::MessagePattern::clear
void clear()
Clears this MessagePattern.
icu::MessagePattern::operator!=
bool operator!=(const MessagePattern &other) const
Definition: messagepattern.h:536
icu::MessagePattern::parseSelectStyle
MessagePattern & parseSelectStyle(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
Parses a SelectFormat pattern string.
icu::MessagePattern::getLimitPartIndex
int32_t getLimitPartIndex(int32_t start) const
Returns the index of the ARG|MSG_LIMIT part corresponding to the ARG|MSG_START at start.
Definition: messagepattern.h:698
icu::MessagePattern::operator=
MessagePattern & operator=(const MessagePattern &other)
Assignment operator.
icu::MessagePattern::getSubstring
UnicodeString getSubstring(const Part &part) const
Returns the substring of the pattern string indicated by the Part.
Definition: messagepattern.h:659
icu::MessagePattern::getNumericValue
double getNumericValue(const Part &part) const
Returns the numeric value associated with an ARG_INT or ARG_DOUBLE.
icu::MessagePattern::countParts
int32_t countParts() const
Returns the number of "parts" created by parsing the pattern string.
Definition: messagepattern.h:616
icu::MessagePattern::parseChoiceStyle
MessagePattern & parseChoiceStyle(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
Parses a ChoiceFormat pattern string.
icu::MessagePattern::autoQuoteApostropheDeep
UnicodeString autoQuoteApostropheDeep() const
Returns a version of the parsed pattern string where each ASCII apostrophe is doubled (escaped) if it...
icu::MessagePattern::getPartType
UMessagePatternPartType getPartType(int32_t i) const
Returns the UMessagePatternPartType of the i-th pattern "part".
Definition: messagepattern.h:637
icu::MessagePattern::clearPatternAndSetApostropheMode
void clearPatternAndSetApostropheMode(UMessagePatternApostropheMode mode)
Clears this MessagePattern and sets the UMessagePatternApostropheMode.
Definition: messagepattern.h:519
icu::MessagePattern::parse
MessagePattern & parse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
Parses a MessageFormat pattern string.
icu::MessagePattern::hasNamedArguments
UBool hasNamedArguments() const
Does the parsed pattern have named arguments like {first_name}?
Definition: messagepattern.h:570
icu::MessagePattern::MessagePattern
MessagePattern(UErrorCode &errorCode)
Constructs an empty MessagePattern with default UMessagePatternApostropheMode.
icu::MessagePattern::MessagePattern
MessagePattern(const MessagePattern &other)
Copy constructor.
icu::MessagePattern::validateArgumentName
static int32_t validateArgumentName(const UnicodeString &name)
Validates and parses an argument name or argument number string.
icu::MessagePattern::MessagePattern
MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
Constructs a MessagePattern with default UMessagePatternApostropheMode and parses the MessageFormat p...
icu::MessagePattern::hashCode
int32_t hashCode() const
icu::MessagePattern::getPluralOffset
double getPluralOffset(int32_t pluralStart) const
Returns the "offset:" value of a PluralFormat argument, or 0 if none is specified.
icu::MessagePattern::getPatternIndex
int32_t getPatternIndex(int32_t partIndex) const
Returns the pattern index of the specified pattern "part".
Definition: messagepattern.h:648
icu::MessagePattern::MessagePattern
MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode)
Constructs an empty MessagePattern.
icu::MessagePattern::operator==
bool operator==(const MessagePattern &other) const
icu::MessagePattern::hasNumberedArguments
UBool hasNumberedArguments() const
Does the parsed pattern have numbered arguments like {2}?
Definition: messagepattern.h:579
icu::MessagePattern::parsePluralStyle
MessagePattern & parsePluralStyle(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
Parses a PluralFormat pattern string.
icu::MessagePattern::getPart
const Part & getPart(int32_t i) const
Gets the i-th pattern "part".
Definition: messagepattern.h:626
icu::MessagePattern::getApostropheMode
UMessagePatternApostropheMode getApostropheMode() const
Definition: messagepattern.h:550
icu::MessagePattern::~MessagePattern
virtual ~MessagePattern()
Destructor.
icu::MessagePattern::partSubstringMatches
UBool partSubstringMatches(const Part &part, const UnicodeString &s) const
Compares the part's substring with the input string s.
Definition: messagepattern.h:670
icu::MessagePattern::getPatternString
const UnicodeString & getPatternString() const
Definition: messagepattern.h:561
icu::UMemory
UMemory is the common ICU base class.
Definition: uobject.h:115
icu::UObject
UObject is the common ICU "boilerplate" class.
Definition: uobject.h:223
icu::UnicodeString
UnicodeString is a string class that stores Unicode characters directly and provides similar function...
Definition: unistr.h:296
icu::UnicodeString::tempSubString
UnicodeString tempSubString(int32_t start=0, int32_t length=INT32_MAX) const
Create a temporary substring for the specified range.
UMessagePatternPartType
UMessagePatternPartType
MessagePattern::Part type constants.
Definition: messagepattern.h:102
UMSGPAT_PART_TYPE_INSERT_CHAR
@ UMSGPAT_PART_TYPE_INSERT_CHAR
Indicates that a syntax character needs to be inserted for auto-quoting.
Definition: messagepattern.h:136
UMSGPAT_PART_TYPE_ARG_TYPE
@ UMSGPAT_PART_TYPE_ARG_TYPE
The argument type.
Definition: messagepattern.h:179
UMSGPAT_PART_TYPE_MSG_START
@ UMSGPAT_PART_TYPE_MSG_START
Start of a message pattern (main or nested).
Definition: messagepattern.h:112
UMSGPAT_PART_TYPE_ARG_SELECTOR
@ UMSGPAT_PART_TYPE_ARG_SELECTOR
A selector substring in a "complex" argument style.
Definition: messagepattern.h:191
UMSGPAT_PART_TYPE_ARG_LIMIT
@ UMSGPAT_PART_TYPE_ARG_LIMIT
End of an argument.
Definition: messagepattern.h:162
UMSGPAT_PART_TYPE_ARG_NUMBER
@ UMSGPAT_PART_TYPE_ARG_NUMBER
The argument number, provided by the value.
Definition: messagepattern.h:167
UMSGPAT_PART_TYPE_MSG_LIMIT
@ UMSGPAT_PART_TYPE_MSG_LIMIT
End of a message pattern (main or nested).
Definition: messagepattern.h:121
UMSGPAT_PART_TYPE_ARG_DOUBLE
@ UMSGPAT_PART_TYPE_ARG_DOUBLE
A numeric value, for example the offset or an explicit selector value in a PluralFormat style.
Definition: messagepattern.h:206
UMSGPAT_PART_TYPE_ARG_NAME
@ UMSGPAT_PART_TYPE_ARG_NAME
The argument name.
Definition: messagepattern.h:173
UMSGPAT_PART_TYPE_ARG_START
@ UMSGPAT_PART_TYPE_ARG_START
Start of an argument.
Definition: messagepattern.h:155
UMSGPAT_PART_TYPE_REPLACE_NUMBER
@ UMSGPAT_PART_TYPE_REPLACE_NUMBER
Indicates a syntactic (non-escaped) # symbol in a plural variant.
Definition: messagepattern.h:144
UMSGPAT_PART_TYPE_ARG_STYLE
@ UMSGPAT_PART_TYPE_ARG_STYLE
The argument style text.
Definition: messagepattern.h:185
UMSGPAT_PART_TYPE_ARG_INT
@ UMSGPAT_PART_TYPE_ARG_INT
An integer value, for example the offset or an explicit selector value in a PluralFormat style.
Definition: messagepattern.h:198
UMSGPAT_PART_TYPE_SKIP_SYNTAX
@ UMSGPAT_PART_TYPE_SKIP_SYNTAX
Indicates a substring of the pattern string which is to be skipped when formatting.
Definition: messagepattern.h:129
UMessagePatternArgType
UMessagePatternArgType
Argument type constants.
Definition: messagepattern.h:221
UMSGPAT_ARG_TYPE_SELECT
@ UMSGPAT_ARG_TYPE_SELECT
The argument is a SelectFormat with one or more (ARG_SELECTOR, message) pairs.
Definition: messagepattern.h:253
UMSGPAT_ARG_TYPE_NONE
@ UMSGPAT_ARG_TYPE_NONE
The argument has no specified type.
Definition: messagepattern.h:226
UMSGPAT_ARG_TYPE_PLURAL
@ UMSGPAT_ARG_TYPE_PLURAL
The argument is a cardinal-number PluralFormat with an optional ARG_INT or ARG_DOUBLE offset (e....
Definition: messagepattern.h:248
UMSGPAT_ARG_TYPE_SIMPLE
@ UMSGPAT_ARG_TYPE_SIMPLE
The argument has a "simple" type which is provided by the ARG_TYPE part.
Definition: messagepattern.h:232
UMSGPAT_ARG_TYPE_SELECTORDINAL
@ UMSGPAT_ARG_TYPE_SELECTORDINAL
The argument is an ordinal-number PluralFormat with the same style parts sequence and semantics as UM...
Definition: messagepattern.h:259
UMSGPAT_ARG_TYPE_CHOICE
@ UMSGPAT_ARG_TYPE_CHOICE
The argument is a ChoiceFormat with one or more ((ARG_INT | ARG_DOUBLE), ARG_SELECTOR,...
Definition: messagepattern.h:238
UMSGPAT_ARG_NAME_NOT_VALID
@ UMSGPAT_ARG_NAME_NOT_VALID
Return value from MessagePattern.validateArgumentName() for when the string is invalid.
Definition: messagepattern.h:290
UMSGPAT_ARG_NAME_NOT_NUMBER
@ UMSGPAT_ARG_NAME_NOT_NUMBER
Return value from MessagePattern.validateArgumentName() for when the string is a valid "pattern ident...
Definition: messagepattern.h:281
UMessagePatternApostropheMode
UMessagePatternApostropheMode
Mode for when an apostrophe starts quoted literal text for MessageFormat output.
Definition: messagepattern.h:70
UMSGPAT_APOS_DOUBLE_OPTIONAL
@ UMSGPAT_APOS_DOUBLE_OPTIONAL
A literal apostrophe is represented by either a single or a double apostrophe pattern character.
Definition: messagepattern.h:82
UMSGPAT_APOS_DOUBLE_REQUIRED
@ UMSGPAT_APOS_DOUBLE_REQUIRED
A literal apostrophe must be represented by a double apostrophe pattern character.
Definition: messagepattern.h:91
icu::operator==
U_EXPORT UBool operator==(const StringPiece &x, const StringPiece &y)
Global operator == for StringPiece.
parseerr.h
C API: Parse Error Information.
UParseError
A UParseError struct is used to returned detailed information about parsing errors.
Definition: parseerr.h:58
UChar32
int32_t UChar32
Define UChar32 as a type for single Unicode code points.
Definition: umachine.h:427
UBool
int8_t UBool
The ICU boolean type, a signed-byte integer.
Definition: umachine.h:247
unistr.h
C++ API: Unicode String.
utypes.h
Basic definitions for ICU, for both C and C++ APIs.
UErrorCode
UErrorCode
Standard ICU4C error code type, a substitute for exceptions.
Definition: utypes.h:415
U_COMMON_API
#define U_COMMON_API
Set to export library symbols from inside the common library, and to import them from outside.
Definition: utypes.h:300