Add m-esr52 at 52.6.0

1 files changed, 1233 insertions, 0 deletions

diff --git a/intl/icu/source/common/messagepattern.cpp b/intl/icu/source/common/messagepattern.cpp
new file mode 100644
index 000000000..31d5bb7b9
--- /dev/null
+++ b/intl/icu/source/common/messagepattern.cpp
@@ -0,0 +1,1233 @@
+// Copyright (C) 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+*******************************************************************************
+*   Copyright (C) 2011-2012, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*******************************************************************************
+*   file name:  messagepattern.cpp
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2011mar14
+*   created by: Markus W. Scherer
+*/
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+
+#include "unicode/messagepattern.h"
+#include "unicode/unistr.h"
+#include "unicode/utf16.h"
+#include "cmemory.h"
+#include "cstring.h"
+#include "messageimpl.h"
+#include "patternprops.h"
+#include "putilimp.h"
+#include "uassert.h"
+
+U_NAMESPACE_BEGIN
+
+// Unicode character/code point constants ---------------------------------- ***
+
+static const UChar u_pound=0x23;
+static const UChar u_apos=0x27;
+static const UChar u_plus=0x2B;
+static const UChar u_comma=0x2C;
+static const UChar u_minus=0x2D;
+static const UChar u_dot=0x2E;
+static const UChar u_colon=0x3A;
+static const UChar u_lessThan=0x3C;
+static const UChar u_equal=0x3D;
+static const UChar u_A=0x41;
+static const UChar u_C=0x43;
+static const UChar u_D=0x44;
+static const UChar u_E=0x45;
+static const UChar u_H=0x48;
+static const UChar u_I=0x49;
+static const UChar u_L=0x4C;
+static const UChar u_N=0x4E;
+static const UChar u_O=0x4F;
+static const UChar u_P=0x50;
+static const UChar u_R=0x52;
+static const UChar u_S=0x53;
+static const UChar u_T=0x54;
+static const UChar u_U=0x55;
+static const UChar u_Z=0x5A;
+static const UChar u_a=0x61;
+static const UChar u_c=0x63;
+static const UChar u_d=0x64;
+static const UChar u_e=0x65;
+static const UChar u_f=0x66;
+static const UChar u_h=0x68;
+static const UChar u_i=0x69;
+static const UChar u_l=0x6C;
+static const UChar u_n=0x6E;
+static const UChar u_o=0x6F;
+static const UChar u_p=0x70;
+static const UChar u_r=0x72;
+static const UChar u_s=0x73;
+static const UChar u_t=0x74;
+static const UChar u_u=0x75;
+static const UChar u_z=0x7A;
+static const UChar u_leftCurlyBrace=0x7B;
+static const UChar u_pipe=0x7C;
+static const UChar u_rightCurlyBrace=0x7D;
+static const UChar u_lessOrEqual=0x2264;  // U+2264 is <=
+
+static const UChar kOffsetColon[]={  // "offset:"
+    u_o, u_f, u_f, u_s, u_e, u_t, u_colon
+};
+
+static const UChar kOther[]={  // "other"
+    u_o, u_t, u_h, u_e, u_r
+};
+
+// MessagePatternList ------------------------------------------------------ ***
+
+template<typename T, int32_t stackCapacity>
+class MessagePatternList : public UMemory {
+public:
+    MessagePatternList() {}
+    void copyFrom(const MessagePatternList<T, stackCapacity> &other,
+                  int32_t length,
+                  UErrorCode &errorCode);
+    UBool ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode);
+    UBool equals(const MessagePatternList<T, stackCapacity> &other, int32_t length) const {
+        for(int32_t i=0; i<length; ++i) {
+            if(a[i]!=other.a[i]) { return FALSE; }
+        }
+        return TRUE;
+    }
+
+    MaybeStackArray<T, stackCapacity> a;
+};
+
+template<typename T, int32_t stackCapacity>
+void
+MessagePatternList<T, stackCapacity>::copyFrom(
+        const MessagePatternList<T, stackCapacity> &other,
+        int32_t length,
+        UErrorCode &errorCode) {
+    if(U_SUCCESS(errorCode) && length>0) {
+        if(length>a.getCapacity() && NULL==a.resize(length)) {
+            errorCode=U_MEMORY_ALLOCATION_ERROR;
+            return;
+        }
+        uprv_memcpy(a.getAlias(), other.a.getAlias(), (size_t)length*sizeof(T));
+    }
+}
+
+template<typename T, int32_t stackCapacity>
+UBool
+MessagePatternList<T, stackCapacity>::ensureCapacityForOneMore(int32_t oldLength, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return FALSE;
+    }
+    if(a.getCapacity()>oldLength || a.resize(2*oldLength, oldLength)!=NULL) {
+        return TRUE;
+    }
+    errorCode=U_MEMORY_ALLOCATION_ERROR;
+    return FALSE;
+}
+
+// MessagePatternList specializations -------------------------------------- ***
+
+class MessagePatternDoubleList : public MessagePatternList<double, 8> {
+};
+
+class MessagePatternPartsList : public MessagePatternList<MessagePattern::Part, 32> {
+};
+
+// MessagePattern constructors etc. ---------------------------------------- ***
+
+MessagePattern::MessagePattern(UErrorCode &errorCode)
+        : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
+          partsList(NULL), parts(NULL), partsLength(0),
+          numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
+          hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
+    init(errorCode);
+}
+
+MessagePattern::MessagePattern(UMessagePatternApostropheMode mode, UErrorCode &errorCode)
+        : aposMode(mode),
+          partsList(NULL), parts(NULL), partsLength(0),
+          numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
+          hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
+    init(errorCode);
+}
+
+MessagePattern::MessagePattern(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode)
+        : aposMode(UCONFIG_MSGPAT_DEFAULT_APOSTROPHE_MODE),
+          partsList(NULL), parts(NULL), partsLength(0),
+          numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
+          hasArgNames(FALSE), hasArgNumbers(FALSE), needsAutoQuoting(FALSE) {
+    if(init(errorCode)) {
+        parse(pattern, parseError, errorCode);
+    }
+}
+
+UBool
+MessagePattern::init(UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return FALSE;
+    }
+    partsList=new MessagePatternPartsList();
+    if(partsList==NULL) {
+        errorCode=U_MEMORY_ALLOCATION_ERROR;
+        return FALSE;
+    }
+    parts=partsList->a.getAlias();
+    return TRUE;
+}
+
+MessagePattern::MessagePattern(const MessagePattern &other)
+        : UObject(other), aposMode(other.aposMode), msg(other.msg),
+          partsList(NULL), parts(NULL), partsLength(0),
+          numericValuesList(NULL), numericValues(NULL), numericValuesLength(0),
+          hasArgNames(other.hasArgNames), hasArgNumbers(other.hasArgNumbers),
+          needsAutoQuoting(other.needsAutoQuoting) {
+    UErrorCode errorCode=U_ZERO_ERROR;
+    if(!copyStorage(other, errorCode)) {
+        clear();
+    }
+}
+
+MessagePattern &
+MessagePattern::operator=(const MessagePattern &other) {
+    if(this==&other) {
+        return *this;
+    }
+    aposMode=other.aposMode;
+    msg=other.msg;
+    hasArgNames=other.hasArgNames;
+    hasArgNumbers=other.hasArgNumbers;
+    needsAutoQuoting=other.needsAutoQuoting;
+    UErrorCode errorCode=U_ZERO_ERROR;
+    if(!copyStorage(other, errorCode)) {
+        clear();
+    }
+    return *this;
+}
+
+UBool
+MessagePattern::copyStorage(const MessagePattern &other, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return FALSE;
+    }
+    parts=NULL;
+    partsLength=0;
+    numericValues=NULL;
+    numericValuesLength=0;
+    if(partsList==NULL) {
+        partsList=new MessagePatternPartsList();
+        if(partsList==NULL) {
+            errorCode=U_MEMORY_ALLOCATION_ERROR;
+            return FALSE;
+        }
+        parts=partsList->a.getAlias();
+    }
+    if(other.partsLength>0) {
+        partsList->copyFrom(*other.partsList, other.partsLength, errorCode);
+        if(U_FAILURE(errorCode)) {
+            return FALSE;
+        }
+        parts=partsList->a.getAlias();
+        partsLength=other.partsLength;
+    }
+    if(other.numericValuesLength>0) {
+        if(numericValuesList==NULL) {
+            numericValuesList=new MessagePatternDoubleList();
+            if(numericValuesList==NULL) {
+                errorCode=U_MEMORY_ALLOCATION_ERROR;
+                return FALSE;
+            }
+            numericValues=numericValuesList->a.getAlias();
+        }
+        numericValuesList->copyFrom(
+            *other.numericValuesList, other.numericValuesLength, errorCode);
+        if(U_FAILURE(errorCode)) {
+            return FALSE;
+        }
+        numericValues=numericValuesList->a.getAlias();
+        numericValuesLength=other.numericValuesLength;
+    }
+    return TRUE;
+}
+
+MessagePattern::~MessagePattern() {
+    delete partsList;
+    delete numericValuesList;
+}
+
+// MessagePattern API ------------------------------------------------------ ***
+
+MessagePattern &
+MessagePattern::parse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
+    preParse(pattern, parseError, errorCode);
+    parseMessage(0, 0, 0, UMSGPAT_ARG_TYPE_NONE, parseError, errorCode);
+    postParse();
+    return *this;
+}
+
+MessagePattern &
+MessagePattern::parseChoiceStyle(const UnicodeString &pattern,
+                                 UParseError *parseError, UErrorCode &errorCode) {
+    preParse(pattern, parseError, errorCode);
+    parseChoiceStyle(0, 0, parseError, errorCode);
+    postParse();
+    return *this;
+}
+
+MessagePattern &
+MessagePattern::parsePluralStyle(const UnicodeString &pattern,
+                                 UParseError *parseError, UErrorCode &errorCode) {
+    preParse(pattern, parseError, errorCode);
+    parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_PLURAL, 0, 0, parseError, errorCode);
+    postParse();
+    return *this;
+}
+
+MessagePattern &
+MessagePattern::parseSelectStyle(const UnicodeString &pattern,
+                                 UParseError *parseError, UErrorCode &errorCode) {
+    preParse(pattern, parseError, errorCode);
+    parsePluralOrSelectStyle(UMSGPAT_ARG_TYPE_SELECT, 0, 0, parseError, errorCode);
+    postParse();
+    return *this;
+}
+
+void
+MessagePattern::clear() {
+    // Mostly the same as preParse().
+    msg.remove();
+    hasArgNames=hasArgNumbers=FALSE;
+    needsAutoQuoting=FALSE;
+    partsLength=0;
+    numericValuesLength=0;
+}
+
+UBool
+MessagePattern::operator==(const MessagePattern &other) const {
+    if(this==&other) {
+        return TRUE;
+    }
+    return
+        aposMode==other.aposMode &&
+        msg==other.msg &&
+        // parts.equals(o.parts)
+        partsLength==other.partsLength &&
+        (partsLength==0 || partsList->equals(*other.partsList, partsLength));
+    // No need to compare numericValues if msg and parts are the same.
+}
+
+int32_t
+MessagePattern::hashCode() const {
+    int32_t hash=(aposMode*37+msg.hashCode())*37+partsLength;
+    for(int32_t i=0; i<partsLength; ++i) {
+        hash=hash*37+parts[i].hashCode();
+    }
+    return hash;
+}
+
+int32_t
+MessagePattern::validateArgumentName(const UnicodeString &name) {
+    if(!PatternProps::isIdentifier(name.getBuffer(), name.length())) {
+        return UMSGPAT_ARG_NAME_NOT_VALID;
+    }
+    return parseArgNumber(name, 0, name.length());
+}
+
+UnicodeString
+MessagePattern::autoQuoteApostropheDeep() const {
+    if(!needsAutoQuoting) {
+        return msg;
+    }
+    UnicodeString modified(msg);
+    // Iterate backward so that the insertion indexes do not change.
+    int32_t count=countParts();
+    for(int32_t i=count; i>0;) {
+        const Part &part=getPart(--i);
+        if(part.getType()==UMSGPAT_PART_TYPE_INSERT_CHAR) {
+           modified.insert(part.index, (UChar)part.value);
+        }
+    }
+    return modified;
+}
+
+double
+MessagePattern::getNumericValue(const Part &part) const {
+    UMessagePatternPartType type=part.type;
+    if(type==UMSGPAT_PART_TYPE_ARG_INT) {
+        return part.value;
+    } else if(type==UMSGPAT_PART_TYPE_ARG_DOUBLE) {
+        return numericValues[part.value];
+    } else {
+        return UMSGPAT_NO_NUMERIC_VALUE;
+    }
+}
+
+/**
+  * 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.
+  * @draft ICU 4.8
+  */
+double
+MessagePattern::getPluralOffset(int32_t pluralStart) const {
+    const Part &part=getPart(pluralStart);
+    if(Part::hasNumericValue(part.type)) {
+        return getNumericValue(part);
+    } else {
+        return 0;
+    }
+}
+
+// MessagePattern::Part ---------------------------------------------------- ***
+
+UBool
+MessagePattern::Part::operator==(const Part &other) const {
+    if(this==&other) {
+        return TRUE;
+    }
+    return
+        type==other.type &&
+        index==other.index &&
+        length==other.length &&
+        value==other.value &&
+        limitPartIndex==other.limitPartIndex;
+}
+
+// MessagePattern parser --------------------------------------------------- ***
+
+void
+MessagePattern::preParse(const UnicodeString &pattern, UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return;
+    }
+    if(parseError!=NULL) {
+        parseError->line=0;
+        parseError->offset=0;
+        parseError->preContext[0]=0;
+        parseError->postContext[0]=0;
+    }
+    msg=pattern;
+    hasArgNames=hasArgNumbers=FALSE;
+    needsAutoQuoting=FALSE;
+    partsLength=0;
+    numericValuesLength=0;
+}
+
+void
+MessagePattern::postParse() {
+    if(partsList!=NULL) {
+        parts=partsList->a.getAlias();
+    }
+    if(numericValuesList!=NULL) {
+        numericValues=numericValuesList->a.getAlias();
+    }
+}
+
+int32_t
+MessagePattern::parseMessage(int32_t index, int32_t msgStartLength,
+                             int32_t nestingLevel, UMessagePatternArgType parentType,
+                             UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    if(nestingLevel>Part::MAX_VALUE) {
+        errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+        return 0;
+    }
+    int32_t msgStart=partsLength;
+    addPart(UMSGPAT_PART_TYPE_MSG_START, index, msgStartLength, nestingLevel, errorCode);
+    index+=msgStartLength;
+    for(;;) {  // while(index<msg.length()) with U_FAILURE(errorCode) check
+        if(U_FAILURE(errorCode)) {
+            return 0;
+        }
+        if(index>=msg.length()) {
+            break;
+        }
+        UChar c=msg.charAt(index++);
+        if(c==u_apos) {
+            if(index==msg.length()) {
+                // The apostrophe is the last character in the pattern. 
+                // Add a Part for auto-quoting.
+                addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
+                        u_apos, errorCode);  // value=char to be inserted
+                needsAutoQuoting=TRUE;
+            } else {
+                c=msg.charAt(index);
+                if(c==u_apos) {
+                    // double apostrophe, skip the second one
+                    addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
+                } else if(
+                    aposMode==UMSGPAT_APOS_DOUBLE_REQUIRED ||
+                    c==u_leftCurlyBrace || c==u_rightCurlyBrace ||
+                    (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe) ||
+                    (UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound)
+                ) {
+                    // skip the quote-starting apostrophe
+                    addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index-1, 1, 0, errorCode);
+                    // find the end of the quoted literal text
+                    for(;;) {
+                        index=msg.indexOf(u_apos, index+1);
+                        if(index>=0) {
+                            if(/*(index+1)<msg.length() &&*/ msg.charAt(index+1)==u_apos) {
+                                // double apostrophe inside quoted literal text
+                                // still encodes a single apostrophe, skip the second one
+                                addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, ++index, 1, 0, errorCode);
+                            } else {
+                                // skip the quote-ending apostrophe
+                                addPart(UMSGPAT_PART_TYPE_SKIP_SYNTAX, index++, 1, 0, errorCode);
+                                break;
+                            }
+                        } else {
+                            // The quoted text reaches to the end of the of the message.
+                            index=msg.length();
+                            // Add a Part for auto-quoting.
+                            addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
+                                    u_apos, errorCode);  // value=char to be inserted
+                            needsAutoQuoting=TRUE;
+                            break;
+                        }
+                    }
+                } else {
+                    // Interpret the apostrophe as literal text.
+                    // Add a Part for auto-quoting.
+                    addPart(UMSGPAT_PART_TYPE_INSERT_CHAR, index, 0,
+                            u_apos, errorCode);  // value=char to be inserted
+                    needsAutoQuoting=TRUE;
+                }
+            }
+        } else if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(parentType) && c==u_pound) {
+            // The unquoted # in a plural message fragment will be replaced
+            // with the (number-offset).
+            addPart(UMSGPAT_PART_TYPE_REPLACE_NUMBER, index-1, 1, 0, errorCode);
+        } else if(c==u_leftCurlyBrace) {
+            index=parseArg(index-1, 1, nestingLevel, parseError, errorCode);
+        } else if((nestingLevel>0 && c==u_rightCurlyBrace) ||
+                  (parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_pipe)) {
+            // Finish the message before the terminator.
+            // In a choice style, report the "}" substring only for the following ARG_LIMIT,
+            // not for this MSG_LIMIT.
+            int32_t limitLength=(parentType==UMSGPAT_ARG_TYPE_CHOICE && c==u_rightCurlyBrace) ? 0 : 1;
+            addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index-1, limitLength,
+                         nestingLevel, errorCode);
+            if(parentType==UMSGPAT_ARG_TYPE_CHOICE) {
+                // Let the choice style parser see the '}' or '|'.
+                return index-1;
+            } else {
+                // continue parsing after the '}'
+                return index;
+            }
+        }  // else: c is part of literal text
+    }
+    if(nestingLevel>0 && !inTopLevelChoiceMessage(nestingLevel, parentType)) {
+        setParseError(parseError, 0);  // Unmatched '{' braces in message.
+        errorCode=U_UNMATCHED_BRACES;
+        return 0;
+    }
+    addLimitPart(msgStart, UMSGPAT_PART_TYPE_MSG_LIMIT, index, 0, nestingLevel, errorCode);
+    return index;
+}
+
+int32_t
+MessagePattern::parseArg(int32_t index, int32_t argStartLength, int32_t nestingLevel,
+                         UParseError *parseError, UErrorCode &errorCode) {
+    int32_t argStart=partsLength;
+    UMessagePatternArgType argType=UMSGPAT_ARG_TYPE_NONE;
+    addPart(UMSGPAT_PART_TYPE_ARG_START, index, argStartLength, argType, errorCode);
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    int32_t nameIndex=index=skipWhiteSpace(index+argStartLength);
+    if(index==msg.length()) {
+        setParseError(parseError, 0);  // Unmatched '{' braces in message.
+        errorCode=U_UNMATCHED_BRACES;
+        return 0;
+    }
+    // parse argument name or number
+    index=skipIdentifier(index);
+    int32_t number=parseArgNumber(nameIndex, index);
+    if(number>=0) {
+        int32_t length=index-nameIndex;
+        if(length>Part::MAX_LENGTH || number>Part::MAX_VALUE) {
+            setParseError(parseError, nameIndex);  // Argument number too large.
+            errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return 0;
+        }
+        hasArgNumbers=TRUE;
+        addPart(UMSGPAT_PART_TYPE_ARG_NUMBER, nameIndex, length, number, errorCode);
+    } else if(number==UMSGPAT_ARG_NAME_NOT_NUMBER) {
+        int32_t length=index-nameIndex;
+        if(length>Part::MAX_LENGTH) {
+            setParseError(parseError, nameIndex);  // Argument name too long.
+            errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return 0;
+        }
+        hasArgNames=TRUE;
+        addPart(UMSGPAT_PART_TYPE_ARG_NAME, nameIndex, length, 0, errorCode);
+    } else {  // number<-1 (ARG_NAME_NOT_VALID)
+        setParseError(parseError, nameIndex);  // Bad argument syntax.
+        errorCode=U_PATTERN_SYNTAX_ERROR;
+        return 0;
+    }
+    index=skipWhiteSpace(index);
+    if(index==msg.length()) {
+        setParseError(parseError, 0);  // Unmatched '{' braces in message.
+        errorCode=U_UNMATCHED_BRACES;
+        return 0;
+    }
+    UChar c=msg.charAt(index);
+    if(c==u_rightCurlyBrace) {
+        // all done
+    } else if(c!=u_comma) {
+        setParseError(parseError, nameIndex);  // Bad argument syntax.
+        errorCode=U_PATTERN_SYNTAX_ERROR;
+        return 0;
+    } else /* ',' */ {
+        // parse argument type: case-sensitive a-zA-Z
+        int32_t typeIndex=index=skipWhiteSpace(index+1);
+        while(index<msg.length() && isArgTypeChar(msg.charAt(index))) {
+            ++index;
+        }
+        int32_t length=index-typeIndex;
+        index=skipWhiteSpace(index);
+        if(index==msg.length()) {
+            setParseError(parseError, 0);  // Unmatched '{' braces in message.
+            errorCode=U_UNMATCHED_BRACES;
+            return 0;
+        }
+        if(length==0 || ((c=msg.charAt(index))!=u_comma && c!=u_rightCurlyBrace)) {
+            setParseError(parseError, nameIndex);  // Bad argument syntax.
+            errorCode=U_PATTERN_SYNTAX_ERROR;
+            return 0;
+        }
+        if(length>Part::MAX_LENGTH) {
+            setParseError(parseError, nameIndex);  // Argument type name too long.
+            errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return 0;
+        }
+        argType=UMSGPAT_ARG_TYPE_SIMPLE;
+        if(length==6) {
+            // case-insensitive comparisons for complex-type names
+            if(isChoice(typeIndex)) {
+                argType=UMSGPAT_ARG_TYPE_CHOICE;
+            } else if(isPlural(typeIndex)) {
+                argType=UMSGPAT_ARG_TYPE_PLURAL;
+            } else if(isSelect(typeIndex)) {
+                argType=UMSGPAT_ARG_TYPE_SELECT;
+            }
+        } else if(length==13) {
+            if(isSelect(typeIndex) && isOrdinal(typeIndex+6)) {
+                argType=UMSGPAT_ARG_TYPE_SELECTORDINAL;
+            }
+        }
+        // change the ARG_START type from NONE to argType
+        partsList->a[argStart].value=(int16_t)argType;
+        if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
+            addPart(UMSGPAT_PART_TYPE_ARG_TYPE, typeIndex, length, 0, errorCode);
+        }
+        // look for an argument style (pattern)
+        if(c==u_rightCurlyBrace) {
+            if(argType!=UMSGPAT_ARG_TYPE_SIMPLE) {
+                setParseError(parseError, nameIndex);  // No style field for complex argument.
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+        } else /* ',' */ {
+            ++index;
+            if(argType==UMSGPAT_ARG_TYPE_SIMPLE) {
+                index=parseSimpleStyle(index, parseError, errorCode);
+            } else if(argType==UMSGPAT_ARG_TYPE_CHOICE) {
+                index=parseChoiceStyle(index, nestingLevel, parseError, errorCode);
+            } else {
+                index=parsePluralOrSelectStyle(argType, index, nestingLevel, parseError, errorCode);
+            }
+        }
+    }
+    // Argument parsing stopped on the '}'.
+    addLimitPart(argStart, UMSGPAT_PART_TYPE_ARG_LIMIT, index, 1, argType, errorCode);
+    return index+1;
+}
+
+int32_t
+MessagePattern::parseSimpleStyle(int32_t index, UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    int32_t start=index;
+    int32_t nestedBraces=0;
+    while(index<msg.length()) {
+        UChar c=msg.charAt(index++);
+        if(c==u_apos) {
+            // Treat apostrophe as quoting but include it in the style part.
+            // Find the end of the quoted literal text.
+            index=msg.indexOf(u_apos, index);
+            if(index<0) {
+                // Quoted literal argument style text reaches to the end of the message.
+                setParseError(parseError, start);
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+            // skip the quote-ending apostrophe
+            ++index;
+        } else if(c==u_leftCurlyBrace) {
+            ++nestedBraces;
+        } else if(c==u_rightCurlyBrace) {
+            if(nestedBraces>0) {
+                --nestedBraces;
+            } else {
+                int32_t length=--index-start;
+                if(length>Part::MAX_LENGTH) {
+                    setParseError(parseError, start);  // Argument style text too long.
+                    errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+                    return 0;
+                }
+                addPart(UMSGPAT_PART_TYPE_ARG_STYLE, start, length, 0, errorCode);
+                return index;
+            }
+        }  // c is part of literal text
+    }
+    setParseError(parseError, 0);  // Unmatched '{' braces in message.
+    errorCode=U_UNMATCHED_BRACES;
+    return 0;
+}
+
+int32_t
+MessagePattern::parseChoiceStyle(int32_t index, int32_t nestingLevel,
+                                 UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    int32_t start=index;
+    index=skipWhiteSpace(index);
+    if(index==msg.length() || msg.charAt(index)==u_rightCurlyBrace) {
+        setParseError(parseError, 0);  // Missing choice argument pattern.
+        errorCode=U_PATTERN_SYNTAX_ERROR;
+        return 0;
+    }
+    for(;;) {
+        // The choice argument style contains |-separated (number, separator, message) triples.
+        // Parse the number.
+        int32_t numberIndex=index;
+        index=skipDouble(index);
+        int32_t length=index-numberIndex;
+        if(length==0) {
+            setParseError(parseError, start);  // Bad choice pattern syntax.
+            errorCode=U_PATTERN_SYNTAX_ERROR;
+            return 0;
+        }
+        if(length>Part::MAX_LENGTH) {
+            setParseError(parseError, numberIndex);  // Choice number too long.
+            errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return 0;
+        }
+        parseDouble(numberIndex, index, TRUE, parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
+        if(U_FAILURE(errorCode)) {
+            return 0;
+        }
+        // Parse the separator.
+        index=skipWhiteSpace(index);
+        if(index==msg.length()) {
+            setParseError(parseError, start);  // Bad choice pattern syntax.
+            errorCode=U_PATTERN_SYNTAX_ERROR;
+            return 0;
+        }
+        UChar c=msg.charAt(index);
+        if(!(c==u_pound || c==u_lessThan || c==u_lessOrEqual)) {  // U+2264 is <=
+            setParseError(parseError, start);  // Expected choice separator (#<\u2264) instead of c.
+            errorCode=U_PATTERN_SYNTAX_ERROR;
+            return 0;
+        }
+        addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, index, 1, 0, errorCode);
+        // Parse the message fragment.
+        index=parseMessage(++index, 0, nestingLevel+1, UMSGPAT_ARG_TYPE_CHOICE, parseError, errorCode);
+        if(U_FAILURE(errorCode)) {
+            return 0;
+        }
+        // parseMessage(..., CHOICE) returns the index of the terminator, or msg.length().
+        if(index==msg.length()) {
+            return index;
+        }
+        if(msg.charAt(index)==u_rightCurlyBrace) {
+            if(!inMessageFormatPattern(nestingLevel)) {
+                setParseError(parseError, start);  // Bad choice pattern syntax.
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+            return index;
+        }  // else the terminator is '|'
+        index=skipWhiteSpace(index+1);
+    }
+}
+
+int32_t
+MessagePattern::parsePluralOrSelectStyle(UMessagePatternArgType argType,
+                                         int32_t index, int32_t nestingLevel,
+                                         UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return 0;
+    }
+    int32_t start=index;
+    UBool isEmpty=TRUE;
+    UBool hasOther=FALSE;
+    for(;;) {
+        // First, collect the selector looking for a small set of terminators.
+        // It would be a little faster to consider the syntax of each possible
+        // token right here, but that makes the code too complicated.
+        index=skipWhiteSpace(index);
+        UBool eos=index==msg.length();
+        if(eos || msg.charAt(index)==u_rightCurlyBrace) {
+            if(eos==inMessageFormatPattern(nestingLevel)) {
+                setParseError(parseError, start);  // Bad plural/select pattern syntax.
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+            if(!hasOther) {
+                setParseError(parseError, 0);  // Missing 'other' keyword in plural/select pattern.
+                errorCode=U_DEFAULT_KEYWORD_MISSING;
+                return 0;
+            }
+            return index;
+        }
+        int32_t selectorIndex=index;
+        if(UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && msg.charAt(selectorIndex)==u_equal) {
+            // explicit-value plural selector: =double
+            index=skipDouble(index+1);
+            int32_t length=index-selectorIndex;
+            if(length==1) {
+                setParseError(parseError, start);  // Bad plural/select pattern syntax.
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+            if(length>Part::MAX_LENGTH) {
+                setParseError(parseError, selectorIndex);  // Argument selector too long.
+                errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+                return 0;
+            }
+            addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
+            parseDouble(selectorIndex+1, index, FALSE,
+                        parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
+        } else {
+            index=skipIdentifier(index);
+            int32_t length=index-selectorIndex;
+            if(length==0) {
+                setParseError(parseError, start);  // Bad plural/select pattern syntax.
+                errorCode=U_PATTERN_SYNTAX_ERROR;
+                return 0;
+            }
+            // Note: The ':' in "offset:" is just beyond the skipIdentifier() range.
+            if( UMSGPAT_ARG_TYPE_HAS_PLURAL_STYLE(argType) && length==6 && index<msg.length() &&
+                0==msg.compare(selectorIndex, 7, kOffsetColon, 0, 7)
+            ) {
+                // plural offset, not a selector
+                if(!isEmpty) {
+                    // Plural argument 'offset:' (if present) must precede key-message pairs.
+                    setParseError(parseError, start);
+                    errorCode=U_PATTERN_SYNTAX_ERROR;
+                    return 0;
+                }
+                // allow whitespace between offset: and its value
+                int32_t valueIndex=skipWhiteSpace(index+1);  // The ':' is at index.
+                index=skipDouble(valueIndex);
+                if(index==valueIndex) {
+                    setParseError(parseError, start);  // Missing value for plural 'offset:'.
+                    errorCode=U_PATTERN_SYNTAX_ERROR;
+                    return 0;
+                }
+                if((index-valueIndex)>Part::MAX_LENGTH) {
+                    setParseError(parseError, valueIndex);  // Plural offset value too long.
+                    errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+                    return 0;
+                }
+                parseDouble(valueIndex, index, FALSE,
+                            parseError, errorCode);  // adds ARG_INT or ARG_DOUBLE
+                if(U_FAILURE(errorCode)) {
+                    return 0;
+                }
+                isEmpty=FALSE;
+                continue;  // no message fragment after the offset
+            } else {
+                // normal selector word
+                if(length>Part::MAX_LENGTH) {
+                    setParseError(parseError, selectorIndex);  // Argument selector too long.
+                    errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+                    return 0;
+                }
+                addPart(UMSGPAT_PART_TYPE_ARG_SELECTOR, selectorIndex, length, 0, errorCode);
+                if(0==msg.compare(selectorIndex, length, kOther, 0, 5)) {
+                    hasOther=TRUE;
+                }
+            }
+        }
+        if(U_FAILURE(errorCode)) {
+            return 0;
+        }
+
+        // parse the message fragment following the selector
+        index=skipWhiteSpace(index);
+        if(index==msg.length() || msg.charAt(index)!=u_leftCurlyBrace) {
+            setParseError(parseError, selectorIndex);  // No message fragment after plural/select selector.
+            errorCode=U_PATTERN_SYNTAX_ERROR;
+            return 0;
+        }
+        index=parseMessage(index, 1, nestingLevel+1, argType, parseError, errorCode);
+        if(U_FAILURE(errorCode)) {
+            return 0;
+        }
+        isEmpty=FALSE;
+    }
+}
+
+int32_t
+MessagePattern::parseArgNumber(const UnicodeString &s, int32_t start, int32_t limit) {
+    // If the identifier contains only ASCII digits, then it is an argument _number_
+    // and must not have leading zeros (except "0" itself).
+    // Otherwise it is an argument _name_.
+    if(start>=limit) {
+        return UMSGPAT_ARG_NAME_NOT_VALID;
+    }
+    int32_t number;
+    // Defer numeric errors until we know there are only digits.
+    UBool badNumber;
+    UChar c=s.charAt(start++);
+    if(c==0x30) {
+        if(start==limit) {
+            return 0;
+        } else {
+            number=0;
+            badNumber=TRUE;  // leading zero
+        }
+    } else if(0x31<=c && c<=0x39) {
+        number=c-0x30;
+        badNumber=FALSE;
+    } else {
+        return UMSGPAT_ARG_NAME_NOT_NUMBER;
+    }
+    while(start<limit) {
+        c=s.charAt(start++);
+        if(0x30<=c && c<=0x39) {
+            if(number>=INT32_MAX/10) {
+                badNumber=TRUE;  // overflow
+            }
+            number=number*10+(c-0x30);
+        } else {
+            return UMSGPAT_ARG_NAME_NOT_NUMBER;
+        }
+    }
+    // There are only ASCII digits.
+    if(badNumber) {
+        return UMSGPAT_ARG_NAME_NOT_VALID;
+    } else {
+        return number;
+    }
+}
+
+void
+MessagePattern::parseDouble(int32_t start, int32_t limit, UBool allowInfinity,
+                            UParseError *parseError, UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return;
+    }
+    U_ASSERT(start<limit);
+    // fake loop for easy exit and single throw statement
+    for(;;) { /*loop doesn't iterate*/
+        // fast path for small integers and infinity
+        int32_t value=0;
+        int32_t isNegative=0;  // not boolean so that we can easily add it to value
+        int32_t index=start;
+        UChar c=msg.charAt(index++);
+        if(c==u_minus) {
+            isNegative=1;
+            if(index==limit) {
+                break;  // no number
+            }
+            c=msg.charAt(index++);
+        } else if(c==u_plus) {
+            if(index==limit) {
+                break;  // no number
+            }
+            c=msg.charAt(index++);
+        }
+        if(c==0x221e) {  // infinity
+            if(allowInfinity && index==limit) {
+                double infinity=uprv_getInfinity();
+                addArgDoublePart(
+                    isNegative!=0 ? -infinity : infinity,
+                    start, limit-start, errorCode);
+                return;
+            } else {
+                break;
+            }
+        }
+        // try to parse the number as a small integer but fall back to a double
+        while('0'<=c && c<='9') {
+            value=value*10+(c-'0');
+            if(value>(Part::MAX_VALUE+isNegative)) {
+                break;  // not a small-enough integer
+            }
+            if(index==limit) {
+                addPart(UMSGPAT_PART_TYPE_ARG_INT, start, limit-start,
+                        isNegative!=0 ? -value : value, errorCode);
+                return;
+            }
+            c=msg.charAt(index++);
+        }
+        // Let Double.parseDouble() throw a NumberFormatException.
+        char numberChars[128];
+        int32_t capacity=(int32_t)sizeof(numberChars);
+        int32_t length=limit-start;
+        if(length>=capacity) {
+            break;  // number too long
+        }
+        msg.extract(start, length, numberChars, capacity, US_INV);
+        if((int32_t)uprv_strlen(numberChars)<length) {
+            break;  // contains non-invariant character that was turned into NUL
+        }
+        char *end;
+        double numericValue=uprv_strtod(numberChars, &end);
+        if(end!=(numberChars+length)) {
+            break;  // parsing error
+        }
+        addArgDoublePart(numericValue, start, length, errorCode);
+        return;
+    }
+    setParseError(parseError, start /*, limit*/);  // Bad syntax for numeric value.
+    errorCode=U_PATTERN_SYNTAX_ERROR;
+    return;
+}
+
+int32_t
+MessagePattern::skipWhiteSpace(int32_t index) {
+    const UChar *s=msg.getBuffer();
+    int32_t msgLength=msg.length();
+    const UChar *t=PatternProps::skipWhiteSpace(s+index, msgLength-index);
+    return (int32_t)(t-s);
+}
+
+int32_t
+MessagePattern::skipIdentifier(int32_t index) {
+    const UChar *s=msg.getBuffer();
+    int32_t msgLength=msg.length();
+    const UChar *t=PatternProps::skipIdentifier(s+index, msgLength-index);
+    return (int32_t)(t-s);
+}
+
+int32_t
+MessagePattern::skipDouble(int32_t index) {
+    int32_t msgLength=msg.length();
+    while(index<msgLength) {
+        UChar c=msg.charAt(index);
+        // U+221E: Allow the infinity symbol, for ChoiceFormat patterns.
+        if((c<0x30 && c!=u_plus && c!=u_minus && c!=u_dot) || (c>0x39 && c!=u_e && c!=u_E && c!=0x221e)) {
+            break;
+        }
+        ++index;
+    }
+    return index;
+}
+
+UBool
+MessagePattern::isArgTypeChar(UChar32 c) {
+    return (u_a<=c && c<=u_z) || (u_A<=c && c<=u_Z);
+}
+
+UBool
+MessagePattern::isChoice(int32_t index) {
+    UChar c;
+    return
+        ((c=msg.charAt(index++))==u_c || c==u_C) &&
+        ((c=msg.charAt(index++))==u_h || c==u_H) &&
+        ((c=msg.charAt(index++))==u_o || c==u_O) &&
+        ((c=msg.charAt(index++))==u_i || c==u_I) &&
+        ((c=msg.charAt(index++))==u_c || c==u_C) &&
+        ((c=msg.charAt(index))==u_e || c==u_E);
+}
+
+UBool
+MessagePattern::isPlural(int32_t index) {
+    UChar c;
+    return
+        ((c=msg.charAt(index++))==u_p || c==u_P) &&
+        ((c=msg.charAt(index++))==u_l || c==u_L) &&
+        ((c=msg.charAt(index++))==u_u || c==u_U) &&
+        ((c=msg.charAt(index++))==u_r || c==u_R) &&
+        ((c=msg.charAt(index++))==u_a || c==u_A) &&
+        ((c=msg.charAt(index))==u_l || c==u_L);
+}
+
+UBool
+MessagePattern::isSelect(int32_t index) {
+    UChar c;
+    return
+        ((c=msg.charAt(index++))==u_s || c==u_S) &&
+        ((c=msg.charAt(index++))==u_e || c==u_E) &&
+        ((c=msg.charAt(index++))==u_l || c==u_L) &&
+        ((c=msg.charAt(index++))==u_e || c==u_E) &&
+        ((c=msg.charAt(index++))==u_c || c==u_C) &&
+        ((c=msg.charAt(index))==u_t || c==u_T);
+}
+
+UBool
+MessagePattern::isOrdinal(int32_t index) {
+    UChar c;
+    return
+        ((c=msg.charAt(index++))==u_o || c==u_O) &&
+        ((c=msg.charAt(index++))==u_r || c==u_R) &&
+        ((c=msg.charAt(index++))==u_d || c==u_D) &&
+        ((c=msg.charAt(index++))==u_i || c==u_I) &&
+        ((c=msg.charAt(index++))==u_n || c==u_N) &&
+        ((c=msg.charAt(index++))==u_a || c==u_A) &&
+        ((c=msg.charAt(index))==u_l || c==u_L);
+}
+
+UBool
+MessagePattern::inMessageFormatPattern(int32_t nestingLevel) {
+    return nestingLevel>0 || partsList->a[0].type==UMSGPAT_PART_TYPE_MSG_START;
+}
+
+UBool
+MessagePattern::inTopLevelChoiceMessage(int32_t nestingLevel, UMessagePatternArgType parentType) {
+    return
+        nestingLevel==1 &&
+        parentType==UMSGPAT_ARG_TYPE_CHOICE &&
+        partsList->a[0].type!=UMSGPAT_PART_TYPE_MSG_START;
+}
+
+void
+MessagePattern::addPart(UMessagePatternPartType type, int32_t index, int32_t length,
+                        int32_t value, UErrorCode &errorCode) {
+    if(partsList->ensureCapacityForOneMore(partsLength, errorCode)) {
+        Part &part=partsList->a[partsLength++];
+        part.type=type;
+        part.index=index;
+        part.length=(uint16_t)length;
+        part.value=(int16_t)value;
+        part.limitPartIndex=0;
+    }
+}
+
+void
+MessagePattern::addLimitPart(int32_t start,
+                             UMessagePatternPartType type, int32_t index, int32_t length,
+                             int32_t value, UErrorCode &errorCode) {
+    partsList->a[start].limitPartIndex=partsLength;
+    addPart(type, index, length, value, errorCode);
+}
+
+void
+MessagePattern::addArgDoublePart(double numericValue, int32_t start, int32_t length,
+                                 UErrorCode &errorCode) {
+    if(U_FAILURE(errorCode)) {
+        return;
+    }
+    int32_t numericIndex=numericValuesLength;
+    if(numericValuesList==NULL) {
+        numericValuesList=new MessagePatternDoubleList();
+        if(numericValuesList==NULL) {
+            errorCode=U_MEMORY_ALLOCATION_ERROR;
+            return;
+        }
+    } else if(!numericValuesList->ensureCapacityForOneMore(numericValuesLength, errorCode)) {
+        return;
+    } else {
+        if(numericIndex>Part::MAX_VALUE) {
+            errorCode=U_INDEX_OUTOFBOUNDS_ERROR;
+            return;
+        }
+    }
+    numericValuesList->a[numericValuesLength++]=numericValue;
+    addPart(UMSGPAT_PART_TYPE_ARG_DOUBLE, start, length, numericIndex, errorCode);
+}
+
+void
+MessagePattern::setParseError(UParseError *parseError, int32_t index) {
+    if(parseError==NULL) {
+        return;
+    }
+    parseError->offset=index;
+
+    // Set preContext to some of msg before index.
+    // Avoid splitting a surrogate pair.
+    int32_t length=index;
+    if(length>=U_PARSE_CONTEXT_LEN) {
+        length=U_PARSE_CONTEXT_LEN-1;
+        if(length>0 && U16_IS_TRAIL(msg[index-length])) {
+            --length;
+        }
+    }
+    msg.extract(index-length, length, parseError->preContext);
+    parseError->preContext[length]=0;
+
+    // Set postContext to some of msg starting at index.
+    length=msg.length()-index;
+    if(length>=U_PARSE_CONTEXT_LEN) {
+        length=U_PARSE_CONTEXT_LEN-1;
+        if(length>0 && U16_IS_LEAD(msg[index+length-1])) {
+            --length;
+        }
+    }
+    msg.extract(index, length, parseError->postContext);
+    parseError->postContext[length]=0;
+}
+
+// MessageImpl ------------------------------------------------------------- ***
+
+void
+MessageImpl::appendReducedApostrophes(const UnicodeString &s, int32_t start, int32_t limit,
+                                      UnicodeString &sb) {
+    int32_t doubleApos=-1;
+    for(;;) {
+        int32_t i=s.indexOf(u_apos, start);
+        if(i<0 || i>=limit) {
+            sb.append(s, start, limit-start);
+            break;
+        }
+        if(i==doubleApos) {
+            // Double apostrophe at start-1 and start==i, append one.
+            sb.append(u_apos);
+            ++start;
+            doubleApos=-1;
+        } else {
+            // Append text between apostrophes and skip this one.
+            sb.append(s, start, i-start);
+            doubleApos=start=i+1;
+        }
+    }
+}
+
+// Ported from second half of ICU4J SelectFormat.format(String).
+UnicodeString &
+MessageImpl::appendSubMessageWithoutSkipSyntax(const MessagePattern &msgPattern,
+                                               int32_t msgStart,
+                                               UnicodeString &result) {
+    const UnicodeString &msgString=msgPattern.getPatternString();
+    int32_t prevIndex=msgPattern.getPart(msgStart).getLimit();
+    for(int32_t i=msgStart;;) {
+        const MessagePattern::Part &part=msgPattern.getPart(++i);
+        UMessagePatternPartType type=part.getType();
+        int32_t index=part.getIndex();
+        if(type==UMSGPAT_PART_TYPE_MSG_LIMIT) {
+            return result.append(msgString, prevIndex, index-prevIndex);
+        } else if(type==UMSGPAT_PART_TYPE_SKIP_SYNTAX) {
+            result.append(msgString, prevIndex, index-prevIndex);
+            prevIndex=part.getLimit();
+        } else if(type==UMSGPAT_PART_TYPE_ARG_START) {
+            result.append(msgString, prevIndex, index-prevIndex);
+            prevIndex=index;
+            i=msgPattern.getLimitPartIndex(i);
+            index=msgPattern.getPart(i).getLimit();
+            appendReducedApostrophes(msgString, prevIndex, index, result);
+            prevIndex=index;
+        }
+    }
+}
+
+U_NAMESPACE_END
+
+#endif  // !UCONFIG_NO_FORMATTING