498 lines
13 KiB
C++
498 lines
13 KiB
C++
/*
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*******************************************************************************
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* Copyright (C) 1996-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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*******************************************************************************
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*/
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#include "unicode/umsg.h"
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#include "mutex.h"
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#include "unicode/uloc.h"
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#include "unicode/ustring.h"
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#include "unicode/fmtable.h"
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#include "cpputils.h"
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#include "unicode/msgfmt.h"
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#include "unicode/unistr.h"
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#include "unicode/numfmt.h"
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// MessageFormat Type List Number, Date, Time or Choice
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const UnicodeString fgTypeList[] = {
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UnicodeString(), UnicodeString(), UNICODE_STRING("number", 6), UnicodeString(), UNICODE_STRING("date", 4), UnicodeString(), UNICODE_STRING("time", 4), UnicodeString(), UNICODE_STRING("choice", 6)
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};
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// NumberFormat modifier list, default, currency, percent or integer
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const UnicodeString fgModifierList[] = {
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UnicodeString(), UnicodeString(), UNICODE_STRING("currency", 8), UnicodeString(), UNICODE_STRING("percent", 7), UnicodeString(), UNICODE_STRING("integer", 7), UnicodeString(), UnicodeString()
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};
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// DateFormat modifier list, default, short, medium, long or full
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const UnicodeString fgDateModifierList[] = {
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UnicodeString(), UnicodeString(), UNICODE_STRING("short", 5), UnicodeString(), UNICODE_STRING("medium", 6), UnicodeString(), UNICODE_STRING("long", 4), UnicodeString(), UNICODE_STRING("full", 4)
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};
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// Number of items in the lists
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const int32_t fgListLength = 9;
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// Determine if a keyword belongs to a list of keywords
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int32_t
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findKeyword(const UnicodeString& s,
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const UnicodeString *list,
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int32_t& kwLen)
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{
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UnicodeString buffer = s;
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// Trims the space characters and turns all characters
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// in s to lower case.
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buffer.trim().toLower();
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for(int32_t i = 0; i < fgListLength; ++i) {
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// Determine if there is a ','
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// If so, the string contains a modifier, and we only want to
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// parse the type
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int32_t commaPos = buffer.indexOf((UChar)0x002C);
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commaPos = (commaPos == -1 ? buffer.length() : commaPos);
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buffer.truncate(commaPos);
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if(buffer == list[i]) {
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kwLen = list[i].length();
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return i;
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}
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}
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kwLen = 0;
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return - 1;
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}
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// Match the type of argument in a message format pattern
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// The type consists of a type indicator and an optional modifier
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// Possible types : number, date, time, choice
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// Possible modifiers : currency, percent, integer, full, long, short
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// We only worry about parsing the types and the "integer" modifier
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Formattable::Type
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matchType(const UChar *pat,
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int32_t openBrace,
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int32_t closeBrace)
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{
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int32_t len = (closeBrace - openBrace) - 1;
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Formattable::Type result = Formattable::kString;
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// Strings like "{0}" are strings
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if(len == 1) {
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result = Formattable::kString;
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return result;
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}
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// Assume the input is well-formed
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else {
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UnicodeString type((UChar*)pat + openBrace + 1 + 2, len - 2, len - 2);
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int32_t matchLen, kw;
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kw = findKeyword(type, fgTypeList, matchLen);
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// there is a modifier if type contains a ','
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UBool hasModifier = (type.indexOf((UChar)0x002C) != -1);
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switch(kw) {
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// number
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case 1: case 2:
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result = Formattable::kDouble;
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if(hasModifier) {
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UnicodeString modifier((UChar*)pat + openBrace + 1 + 1 + 2 + matchLen,
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len - 2 - matchLen - 1,
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len - 2 - matchLen - 1);
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switch(findKeyword(modifier, fgModifierList, matchLen)) {
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// integer
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case 5: case 6:
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result = Formattable::kLong;
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break;
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}
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}
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break;
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// date
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case 3: case 4:
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// time
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case 5: case 6:
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result = Formattable::kDate;
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break;
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// choice
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case 7: case 8:
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result = Formattable::kDouble;
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break;
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}
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}
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return result;
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}
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// ==========
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// This code section is entirely bogus. I just need an eeasy way to
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// convert from string to an int, and I can't use the standard library
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static NumberFormat *fgNumberFormat = 0;
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NumberFormat*
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umsg_getNumberFormat(UErrorCode& status)
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{
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NumberFormat *theFormat = 0;
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if(fgNumberFormat != 0) {
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Mutex lock;
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if(fgNumberFormat != 0) {
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theFormat = fgNumberFormat;
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fgNumberFormat = 0; // We have exclusive right to this formatter.
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}
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}
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if(theFormat == 0) {
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theFormat = NumberFormat::createInstance(Locale::US, status);
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if(U_FAILURE(status))
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return 0;
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theFormat->setParseIntegerOnly(TRUE);
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}
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return theFormat;
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}
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void
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umsg_releaseNumberFormat(NumberFormat *adopt)
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{
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if(fgNumberFormat == 0) {
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Mutex lock;
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if(fgNumberFormat == 0) {
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fgNumberFormat = adopt;
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adopt = 0;
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}
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}
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delete adopt;
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}
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int32_t
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umsg_stoi(const UnicodeString& string,
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UErrorCode& status)
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{
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NumberFormat *myFormat = umsg_getNumberFormat(status);
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if(U_FAILURE(status))
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return -1; // OK?
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Formattable result;
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// Uses the global number formatter to parse the string.
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// Note: We assume here that parse() is thread-safe.
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myFormat->parse(string, result, status);
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umsg_releaseNumberFormat(myFormat);
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int32_t value = 0;
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if(U_SUCCESS(status) && result.getType() == Formattable::kLong)
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value = result.getLong();
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return value;
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}
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UnicodeString&
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umsg_itos(int32_t i,
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UnicodeString& string)
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{
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UErrorCode status = U_ZERO_ERROR;
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NumberFormat *myFormat = umsg_getNumberFormat(status);
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if(U_FAILURE(status))
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return (string = "<ERROR>");
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myFormat->format(i, string);
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umsg_releaseNumberFormat(myFormat);
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return string;
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}
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// ==========
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#define MAX_ARGS 10
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// Eventually, message format should be rewritten natively in C.
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// For now, this is a hack that should work:
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// 1. Parse the pattern, determining the argument types
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// 2. Create a Formattable array with the varargs
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// 3. Call through to the existing C++ code
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//
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// Right now this imposes the same limit as MessageFormat in C++
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// Namely, only MAX_ARGS arguments are supported
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U_CAPI int32_t
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u_formatMessage( const char *locale,
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const UChar *pattern,
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int32_t patternLength,
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UChar *result,
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int32_t resultLength,
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UErrorCode *status,
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...)
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{
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va_list ap;
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int32_t actLen;
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if(U_FAILURE(*status)) return -1;
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// start vararg processing
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va_start(ap, status);
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actLen = u_vformatMessage(locale,pattern,patternLength,result,resultLength,ap,status);
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// end vararg processing
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va_end(ap);
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return actLen;
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}
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U_CAPI int32_t
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u_vformatMessage( const char *locale,
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const UChar *pattern,
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int32_t patternLength,
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UChar *result,
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int32_t resultLength,
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va_list ap,
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UErrorCode *status)
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{
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if(U_FAILURE(*status)) return -1;
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int32_t patLen = (patternLength == -1 ? u_strlen(pattern) : patternLength);
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// ========================================
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// Begin pseudo-parser
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// This is a simplified version of the C++ pattern parser
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// All it does is look for an unquoted '{' and read the type
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int32_t part = 0;
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UBool inQuote = FALSE;
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int32_t braceStack = 0;
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const UChar *pat = pattern;
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const UChar *patLimit = pattern + patLen;
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int32_t bracePos = 0;
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int32_t count = 0;
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Formattable args [ MAX_ARGS ];
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Formattable::Type argTypes [ MAX_ARGS ];
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// set the types to a bogus value initially (no such type as kArray from C)
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for(int32_t j = 0; j < MAX_ARGS; ++j)
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argTypes[j] = Formattable::kArray;
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// pseudo-parse the pattern
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while(pat < patLimit) {
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if(part == 0) {
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if(*pat == 0x0027 /*'\''*/) {
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// handle double quotes
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if( (pat + 1) < patLimit && *(pat + 1) == 0x0027 /*'\''*/)
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pat++;
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else
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inQuote = ! inQuote;
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}
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else if(*pat == 0x007B /*'{'*/ && ! inQuote) {
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part = 1;
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bracePos = (pat - pattern);
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}
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}
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else if(inQuote) { // just copy quotes in parts
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if(*pat == 0x0027 /*'\''*/)
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inQuote = FALSE;
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}
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else {
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switch (*pat) {
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case 0x002C /*','*/:
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if(part < 3)
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part += 1;
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break;
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case 0x007B /*'{'*/:
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++braceStack;
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break;
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case 0x007D /*'}'*/:
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if(braceStack == 0) {
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part = 0;
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// found a close brace, determine the argument type enclosed
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// and the numeric ID of the argument
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Formattable::Type type =
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matchType(pattern, bracePos, (pat - pattern));
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// the numeric ID is important, because if the pattern has a
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// section like "{0} {0} {0}" we only want to get one argument
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// from the variable argument list, despite the fact that
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// it is in the pattern three times
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int32_t argNum = umsg_stoi(pattern + bracePos + 1, *status);
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if(argNum >= MAX_ARGS) {
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*status = U_INTERNAL_PROGRAM_ERROR;
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return -1;
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}
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// register the type of this argument in our list
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argTypes[argNum] = type;
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// adjust argument count
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count = ( (argNum + 1) > count ? (argNum + 1) : count);
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}
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else
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--braceStack;
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break;
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case 0x0027 /*'\''*/:
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inQuote = TRUE;
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break;
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}
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}
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// increment position in pattern
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pat++;
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}
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// detect any unmatched braces in the pattern
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if(braceStack == 0 && part != 0) {
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*status = U_INVALID_FORMAT_ERROR;
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return -1;
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}
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// iterate through the vararg list, and get the arguments out
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for(int32_t i = 0; i < count; ++i) {
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UChar *stringVal;
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switch(argTypes[i]) {
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case Formattable::kDate:
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args[i].setDate(va_arg(ap, UDate));
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break;
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case Formattable::kDouble:
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args[i].setDouble(va_arg(ap, double));
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break;
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case Formattable::kLong:
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args[i].setLong(va_arg(ap, int32_t));
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break;
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case Formattable::kString:
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// For some reason, a temporary is needed
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stringVal = va_arg(ap, UChar*);
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args[i].setString(stringVal);
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break;
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case Formattable::kArray:
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// throw away this argument
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// this is highly platform-dependent, and probably won't work
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// so, if you try to skip arguments in the list (and not use them)
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// you'll probably crash
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va_arg(ap, int);
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break;
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}
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}
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// End pseudo-parser
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// ========================================
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// just call through to the C++ implementation
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UnicodeString patString((UChar*)pattern, patLen, patLen);
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MessageFormat fmt(patString, Locale(locale), *status);
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UnicodeString res(result, 0, resultLength);
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FieldPosition fp;
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fmt.format(args, count, res, fp, *status);
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return uprv_fillOutputString(res, result, resultLength, status);
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}
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// For parse, do the reverse of format:
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// 1. Call through to the C++ APIs
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// 2. Just assume the user passed in enough arguments.
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// 3. Iterate through each formattable returned, and assign to the arguments
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U_CAPI void
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u_parseMessage( const char *locale,
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const UChar *pattern,
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int32_t patternLength,
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const UChar *source,
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int32_t sourceLength,
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UErrorCode *status,
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...)
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{
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va_list ap;
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if(U_FAILURE(*status)) return;
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// start vararg processing
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va_start(ap, status);
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u_vparseMessage(locale,pattern,patternLength,source,sourceLength,ap,status);
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// end vararg processing
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va_end(ap);
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}
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U_CAPI void
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u_vparseMessage( const char *locale,
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const UChar *pattern,
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int32_t patternLength,
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const UChar *source,
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int32_t sourceLength,
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va_list ap,
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UErrorCode *status)
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{
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if(U_FAILURE(*status)) return;
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int32_t patLen = (patternLength == -1 ? u_strlen(pattern) : patternLength);
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int32_t srcLen = (sourceLength == -1 ? u_strlen(source) : sourceLength);
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UnicodeString patString((UChar*)pattern, patLen, patLen);
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MessageFormat fmt(patString, Locale(locale), *status);
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UnicodeString srcString((UChar*)source, srcLen, srcLen);
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int32_t count = 0;
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Formattable *args = fmt.parse(srcString, count, *status);
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UDate *aDate;
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double *aDouble;
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UChar *aString;
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UnicodeString temp;
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// assign formattables to varargs
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for(int32_t i = 0; i < count; i++) {
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switch(args[i].getType()) {
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case Formattable::kDate:
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aDate = va_arg(ap, UDate*);
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*aDate = args[i].getDate();
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break;
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case Formattable::kDouble:
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aDouble = va_arg(ap, double*);
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*aDouble = args[i].getDouble();
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break;
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case Formattable::kLong:
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// always assume doubles for parsing
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aDouble = va_arg(ap, double*);
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*aDouble = (double) args[i].getLong();
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break;
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case Formattable::kString:
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aString = va_arg(ap, UChar*);
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args[i].getString(temp);
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u_strcpy(aString, temp.getUChars());
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break;
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// better not happen!
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case Formattable::kArray:
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// DIE
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break;
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}
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}
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// clean up
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delete [] args;
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}
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