scuffed-code/icu4c/source/i18n/numparse_affixes.cpp

474 lines
17 KiB
C++

// © 2018 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
#include "unicode/utypes.h"
#if !UCONFIG_NO_FORMATTING
// Allow implicit conversion from char16_t* to UnicodeString for this file:
// Helpful in toString methods and elsewhere.
#define UNISTR_FROM_STRING_EXPLICIT
#include "numparse_types.h"
#include "numparse_affixes.h"
#include "numparse_utils.h"
#include "number_utils.h"
#include "string_segment.h"
using namespace icu;
using namespace icu::numparse;
using namespace icu::numparse::impl;
using namespace icu::number;
using namespace icu::number::impl;
namespace {
/**
* Helper method to return whether the given AffixPatternMatcher equals the given pattern string.
* Either both arguments must be null or the pattern string inside the AffixPatternMatcher must equal
* the given pattern string.
*/
static bool matched(const AffixPatternMatcher* affix, const UnicodeString& patternString) {
return (affix == nullptr && patternString.isBogus()) ||
(affix != nullptr && affix->getPattern() == patternString);
}
/**
* Helper method to return the length of the given AffixPatternMatcher. Returns 0 for null.
*/
static int32_t length(const AffixPatternMatcher* matcher) {
return matcher == nullptr ? 0 : matcher->getPattern().length();
}
/**
* Helper method to return whether (1) both lhs and rhs are null/invalid, or (2) if they are both
* valid, whether they are equal according to operator==. Similar to Java Objects.equals()
*/
static bool equals(const AffixPatternMatcher* lhs, const AffixPatternMatcher* rhs) {
if (lhs == nullptr && rhs == nullptr) {
return true;
}
if (lhs == nullptr || rhs == nullptr) {
return false;
}
return *lhs == *rhs;
}
}
AffixPatternMatcherBuilder::AffixPatternMatcherBuilder(const UnicodeString& pattern,
AffixTokenMatcherWarehouse& warehouse,
IgnorablesMatcher* ignorables)
: fMatchersLen(0),
fLastTypeOrCp(0),
fPattern(pattern),
fWarehouse(warehouse),
fIgnorables(ignorables) {}
void AffixPatternMatcherBuilder::consumeToken(AffixPatternType type, UChar32 cp, UErrorCode& status) {
// This is called by AffixUtils.iterateWithConsumer() for each token.
// Add an ignorables matcher between tokens except between two literals, and don't put two
// ignorables matchers in a row.
if (fIgnorables != nullptr && fMatchersLen > 0 &&
(fLastTypeOrCp < 0 || !fIgnorables->getSet()->contains(fLastTypeOrCp))) {
addMatcher(*fIgnorables);
}
if (type != TYPE_CODEPOINT) {
// Case 1: the token is a symbol.
switch (type) {
case TYPE_MINUS_SIGN:
addMatcher(fWarehouse.minusSign());
break;
case TYPE_PLUS_SIGN:
addMatcher(fWarehouse.plusSign());
break;
case TYPE_PERCENT:
addMatcher(fWarehouse.percent());
break;
case TYPE_PERMILLE:
addMatcher(fWarehouse.permille());
break;
case TYPE_CURRENCY_SINGLE:
case TYPE_CURRENCY_DOUBLE:
case TYPE_CURRENCY_TRIPLE:
case TYPE_CURRENCY_QUAD:
case TYPE_CURRENCY_QUINT:
// All currency symbols use the same matcher
addMatcher(fWarehouse.currency(status));
break;
default:
UPRV_UNREACHABLE;
}
} else if (fIgnorables != nullptr && fIgnorables->getSet()->contains(cp)) {
// Case 2: the token is an ignorable literal.
// No action necessary: the ignorables matcher has already been added.
} else {
// Case 3: the token is a non-ignorable literal.
if (auto* ptr = fWarehouse.nextCodePointMatcher(cp, status)) {
addMatcher(*ptr);
} else {
// OOM; unwind the stack
return;
}
}
fLastTypeOrCp = type != TYPE_CODEPOINT ? type : cp;
}
void AffixPatternMatcherBuilder::addMatcher(NumberParseMatcher& matcher) {
if (fMatchersLen >= fMatchers.getCapacity()) {
fMatchers.resize(fMatchersLen * 2, fMatchersLen);
}
fMatchers[fMatchersLen++] = &matcher;
}
AffixPatternMatcher AffixPatternMatcherBuilder::build() {
return AffixPatternMatcher(fMatchers, fMatchersLen, fPattern);
}
AffixTokenMatcherWarehouse::AffixTokenMatcherWarehouse(const AffixTokenMatcherSetupData* setupData)
: fSetupData(setupData) {}
NumberParseMatcher& AffixTokenMatcherWarehouse::minusSign() {
return fMinusSign = {fSetupData->dfs, true};
}
NumberParseMatcher& AffixTokenMatcherWarehouse::plusSign() {
return fPlusSign = {fSetupData->dfs, true};
}
NumberParseMatcher& AffixTokenMatcherWarehouse::percent() {
return fPercent = {fSetupData->dfs};
}
NumberParseMatcher& AffixTokenMatcherWarehouse::permille() {
return fPermille = {fSetupData->dfs};
}
NumberParseMatcher& AffixTokenMatcherWarehouse::currency(UErrorCode& status) {
return fCurrency = {fSetupData->currencySymbols, fSetupData->dfs, fSetupData->parseFlags, status};
}
IgnorablesMatcher& AffixTokenMatcherWarehouse::ignorables() {
return fSetupData->ignorables;
}
NumberParseMatcher* AffixTokenMatcherWarehouse::nextCodePointMatcher(UChar32 cp, UErrorCode& status) {
if (U_FAILURE(status)) {
return nullptr;
}
auto* result = fCodePoints.create(cp);
if (result == nullptr) {
status = U_MEMORY_ALLOCATION_ERROR;
}
return result;
}
CodePointMatcher::CodePointMatcher(UChar32 cp)
: fCp(cp) {}
bool CodePointMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode&) const {
if (segment.startsWith(fCp)) {
segment.adjustOffsetByCodePoint();
result.setCharsConsumed(segment);
}
return false;
}
bool CodePointMatcher::smokeTest(const StringSegment& segment) const {
return segment.startsWith(fCp);
}
UnicodeString CodePointMatcher::toString() const {
return u"<CodePoint>";
}
AffixPatternMatcher AffixPatternMatcher::fromAffixPattern(const UnicodeString& affixPattern,
AffixTokenMatcherWarehouse& tokenWarehouse,
parse_flags_t parseFlags, bool* success,
UErrorCode& status) {
if (affixPattern.isEmpty()) {
*success = false;
return {};
}
*success = true;
IgnorablesMatcher* ignorables;
if (0 != (parseFlags & PARSE_FLAG_EXACT_AFFIX)) {
ignorables = nullptr;
} else {
ignorables = &tokenWarehouse.ignorables();
}
AffixPatternMatcherBuilder builder(affixPattern, tokenWarehouse, ignorables);
AffixUtils::iterateWithConsumer(affixPattern, builder, status);
return builder.build();
}
AffixPatternMatcher::AffixPatternMatcher(MatcherArray& matchers, int32_t matchersLen,
const UnicodeString& pattern)
: ArraySeriesMatcher(matchers, matchersLen), fPattern(pattern) {}
UnicodeString AffixPatternMatcher::getPattern() const {
return fPattern.toAliasedUnicodeString();
}
bool AffixPatternMatcher::operator==(const AffixPatternMatcher& other) const {
return fPattern == other.fPattern;
}
AffixMatcherWarehouse::AffixMatcherWarehouse(AffixTokenMatcherWarehouse* tokenWarehouse)
: fTokenWarehouse(tokenWarehouse) {
}
bool AffixMatcherWarehouse::isInteresting(const AffixPatternProvider& patternInfo,
const IgnorablesMatcher& ignorables, parse_flags_t parseFlags,
UErrorCode& status) {
UnicodeString posPrefixString = patternInfo.getString(AffixPatternProvider::AFFIX_POS_PREFIX);
UnicodeString posSuffixString = patternInfo.getString(AffixPatternProvider::AFFIX_POS_SUFFIX);
UnicodeString negPrefixString;
UnicodeString negSuffixString;
if (patternInfo.hasNegativeSubpattern()) {
negPrefixString = patternInfo.getString(AffixPatternProvider::AFFIX_NEG_PREFIX);
negSuffixString = patternInfo.getString(AffixPatternProvider::AFFIX_NEG_SUFFIX);
}
if (0 == (parseFlags & PARSE_FLAG_USE_FULL_AFFIXES) &&
AffixUtils::containsOnlySymbolsAndIgnorables(posPrefixString, *ignorables.getSet(), status) &&
AffixUtils::containsOnlySymbolsAndIgnorables(posSuffixString, *ignorables.getSet(), status) &&
AffixUtils::containsOnlySymbolsAndIgnorables(negPrefixString, *ignorables.getSet(), status) &&
AffixUtils::containsOnlySymbolsAndIgnorables(negSuffixString, *ignorables.getSet(), status)
// HACK: Plus and minus sign are a special case: we accept them trailing only if they are
// trailing in the pattern string.
&& !AffixUtils::containsType(posSuffixString, TYPE_PLUS_SIGN, status) &&
!AffixUtils::containsType(posSuffixString, TYPE_MINUS_SIGN, status) &&
!AffixUtils::containsType(negSuffixString, TYPE_PLUS_SIGN, status) &&
!AffixUtils::containsType(negSuffixString, TYPE_MINUS_SIGN, status)) {
// The affixes contain only symbols and ignorables.
// No need to generate affix matchers.
return false;
}
return true;
}
void AffixMatcherWarehouse::createAffixMatchers(const AffixPatternProvider& patternInfo,
MutableMatcherCollection& output,
const IgnorablesMatcher& ignorables,
parse_flags_t parseFlags, UErrorCode& status) {
if (!isInteresting(patternInfo, ignorables, parseFlags, status)) {
return;
}
// The affixes have interesting characters, or we are in strict mode.
// Use initial capacity of 6, the highest possible number of AffixMatchers.
UnicodeString sb;
bool includeUnpaired = 0 != (parseFlags & PARSE_FLAG_INCLUDE_UNPAIRED_AFFIXES);
int32_t numAffixMatchers = 0;
int32_t numAffixPatternMatchers = 0;
AffixPatternMatcher* posPrefix = nullptr;
AffixPatternMatcher* posSuffix = nullptr;
// Pre-process the affix strings to resolve LDML rules like sign display.
for (int8_t typeInt = 0; typeInt < PATTERN_SIGN_TYPE_COUNT; typeInt++) {
auto type = static_cast<PatternSignType>(typeInt);
// Skip affixes in some cases
if (type == PATTERN_SIGN_TYPE_POS
&& 0 != (parseFlags & PARSE_FLAG_PLUS_SIGN_ALLOWED)) {
continue;
}
if (type == PATTERN_SIGN_TYPE_POS_SIGN
&& 0 == (parseFlags & PARSE_FLAG_PLUS_SIGN_ALLOWED)) {
continue;
}
// Generate Prefix
bool hasPrefix = false;
PatternStringUtils::patternInfoToStringBuilder(
patternInfo, true, type, StandardPlural::OTHER, false, sb);
fAffixPatternMatchers[numAffixPatternMatchers] = AffixPatternMatcher::fromAffixPattern(
sb, *fTokenWarehouse, parseFlags, &hasPrefix, status);
AffixPatternMatcher* prefix = hasPrefix ? &fAffixPatternMatchers[numAffixPatternMatchers++]
: nullptr;
// Generate Suffix
bool hasSuffix = false;
PatternStringUtils::patternInfoToStringBuilder(
patternInfo, false, type, StandardPlural::OTHER, false, sb);
fAffixPatternMatchers[numAffixPatternMatchers] = AffixPatternMatcher::fromAffixPattern(
sb, *fTokenWarehouse, parseFlags, &hasSuffix, status);
AffixPatternMatcher* suffix = hasSuffix ? &fAffixPatternMatchers[numAffixPatternMatchers++]
: nullptr;
if (type == PATTERN_SIGN_TYPE_POS) {
posPrefix = prefix;
posSuffix = suffix;
} else if (equals(prefix, posPrefix) && equals(suffix, posSuffix)) {
// Skip adding these matchers (we already have equivalents)
continue;
}
// Flags for setting in the ParsedNumber; the token matchers may add more.
int flags = (type == PATTERN_SIGN_TYPE_NEG) ? FLAG_NEGATIVE : 0;
// Note: it is indeed possible for posPrefix and posSuffix to both be null.
// We still need to add that matcher for strict mode to work.
fAffixMatchers[numAffixMatchers++] = {prefix, suffix, flags};
if (includeUnpaired && prefix != nullptr && suffix != nullptr) {
// The following if statements are designed to prevent adding two identical matchers.
if (type == PATTERN_SIGN_TYPE_POS || !equals(prefix, posPrefix)) {
fAffixMatchers[numAffixMatchers++] = {prefix, nullptr, flags};
}
if (type == PATTERN_SIGN_TYPE_POS || !equals(suffix, posSuffix)) {
fAffixMatchers[numAffixMatchers++] = {nullptr, suffix, flags};
}
}
}
// Put the AffixMatchers in order, and then add them to the output.
// Since there are at most 9 elements, do a simple-to-implement bubble sort.
bool madeChanges;
do {
madeChanges = false;
for (int32_t i = 1; i < numAffixMatchers; i++) {
if (fAffixMatchers[i - 1].compareTo(fAffixMatchers[i]) > 0) {
madeChanges = true;
AffixMatcher temp = std::move(fAffixMatchers[i - 1]);
fAffixMatchers[i - 1] = std::move(fAffixMatchers[i]);
fAffixMatchers[i] = std::move(temp);
}
}
} while (madeChanges);
for (int32_t i = 0; i < numAffixMatchers; i++) {
// Enable the following line to debug affixes
//std::cout << "Adding affix matcher: " << CStr(fAffixMatchers[i].toString())() << std::endl;
output.addMatcher(fAffixMatchers[i]);
}
}
AffixMatcher::AffixMatcher(AffixPatternMatcher* prefix, AffixPatternMatcher* suffix, result_flags_t flags)
: fPrefix(prefix), fSuffix(suffix), fFlags(flags) {}
bool AffixMatcher::match(StringSegment& segment, ParsedNumber& result, UErrorCode& status) const {
if (!result.seenNumber()) {
// Prefix
// Do not match if:
// 1. We have already seen a prefix (result.prefix != null)
// 2. The prefix in this AffixMatcher is empty (prefix == null)
if (!result.prefix.isBogus() || fPrefix == nullptr) {
return false;
}
// Attempt to match the prefix.
int initialOffset = segment.getOffset();
bool maybeMore = fPrefix->match(segment, result, status);
if (initialOffset != segment.getOffset()) {
result.prefix = fPrefix->getPattern();
}
return maybeMore;
} else {
// Suffix
// Do not match if:
// 1. We have already seen a suffix (result.suffix != null)
// 2. The suffix in this AffixMatcher is empty (suffix == null)
// 3. The matched prefix does not equal this AffixMatcher's prefix
if (!result.suffix.isBogus() || fSuffix == nullptr || !matched(fPrefix, result.prefix)) {
return false;
}
// Attempt to match the suffix.
int initialOffset = segment.getOffset();
bool maybeMore = fSuffix->match(segment, result, status);
if (initialOffset != segment.getOffset()) {
result.suffix = fSuffix->getPattern();
}
return maybeMore;
}
}
bool AffixMatcher::smokeTest(const StringSegment& segment) const {
return (fPrefix != nullptr && fPrefix->smokeTest(segment)) ||
(fSuffix != nullptr && fSuffix->smokeTest(segment));
}
void AffixMatcher::postProcess(ParsedNumber& result) const {
// Check to see if our affix is the one that was matched. If so, set the flags in the result.
if (matched(fPrefix, result.prefix) && matched(fSuffix, result.suffix)) {
// Fill in the result prefix and suffix with non-null values (empty string).
// Used by strict mode to determine whether an entire affix pair was matched.
if (result.prefix.isBogus()) {
result.prefix = UnicodeString();
}
if (result.suffix.isBogus()) {
result.suffix = UnicodeString();
}
result.flags |= fFlags;
if (fPrefix != nullptr) {
fPrefix->postProcess(result);
}
if (fSuffix != nullptr) {
fSuffix->postProcess(result);
}
}
}
int8_t AffixMatcher::compareTo(const AffixMatcher& rhs) const {
const AffixMatcher& lhs = *this;
if (length(lhs.fPrefix) != length(rhs.fPrefix)) {
return length(lhs.fPrefix) > length(rhs.fPrefix) ? -1 : 1;
} else if (length(lhs.fSuffix) != length(rhs.fSuffix)) {
return length(lhs.fSuffix) > length(rhs.fSuffix) ? -1 : 1;
} else {
return 0;
}
}
UnicodeString AffixMatcher::toString() const {
bool isNegative = 0 != (fFlags & FLAG_NEGATIVE);
return UnicodeString(u"<Affix") + (isNegative ? u":negative " : u" ") +
(fPrefix ? fPrefix->getPattern() : u"null") + u"#" +
(fSuffix ? fSuffix->getPattern() : u"null") + u">";
}
#endif /* #if !UCONFIG_NO_FORMATTING */