294 lines
9.3 KiB
C++
294 lines
9.3 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
|
|
// License & terms of use: http://www.unicode.org/copyright.html
|
|
/*
|
|
**********************************************************************
|
|
* Copyright (c) 2001-2011, International Business Machines
|
|
* Corporation and others. All Rights Reserved.
|
|
**********************************************************************
|
|
* Date Name Description
|
|
* 11/19/2001 aliu Creation.
|
|
**********************************************************************
|
|
*/
|
|
|
|
#include "unicode/utypes.h"
|
|
|
|
#if !UCONFIG_NO_TRANSLITERATION
|
|
|
|
#include "unicode/uchar.h"
|
|
#include "unicode/utf16.h"
|
|
#include "unesctrn.h"
|
|
#include "util.h"
|
|
|
|
#include "cmemory.h"
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
/**
|
|
* Special character marking the end of the spec[] array.
|
|
*/
|
|
static const UChar END = 0xFFFF;
|
|
|
|
// Unicode: "U+10FFFF" hex, min=4, max=6
|
|
static const UChar SPEC_Unicode[] = {
|
|
2, 0, 16, 4, 6, 85/*U*/, 43/*+*/,
|
|
END
|
|
};
|
|
|
|
// Java: "\\uFFFF" hex, min=4, max=4
|
|
static const UChar SPEC_Java[] = {
|
|
2, 0, 16, 4, 4, 92/*\*/, 117/*u*/,
|
|
END
|
|
};
|
|
|
|
// C: "\\uFFFF" hex, min=4, max=4; \\U0010FFFF hex, min=8, max=8
|
|
static const UChar SPEC_C[] = {
|
|
2, 0, 16, 4, 4, 92/*\*/, 117/*u*/,
|
|
2, 0, 16, 8, 8, 92/*\*/, 85/*U*/,
|
|
END
|
|
};
|
|
|
|
// XML: "" hex, min=1, max=6
|
|
static const UChar SPEC_XML[] = {
|
|
3, 1, 16, 1, 6, 38/*&*/, 35/*#*/, 120/*x*/, 59/*;*/,
|
|
END
|
|
};
|
|
|
|
// XML10: "" dec, min=1, max=7 (not really "Hex-Any")
|
|
static const UChar SPEC_XML10[] = {
|
|
2, 1, 10, 1, 7, 38/*&*/, 35/*#*/, 59/*;*/,
|
|
END
|
|
};
|
|
|
|
// Perl: "\\x{263A}" hex, min=1, max=6
|
|
static const UChar SPEC_Perl[] = {
|
|
3, 1, 16, 1, 6, 92/*\*/, 120/*x*/, 123/*{*/, 125/*}*/,
|
|
END
|
|
};
|
|
|
|
// All: Java, C, Perl, XML, XML10, Unicode
|
|
static const UChar SPEC_Any[] = {
|
|
2, 0, 16, 4, 6, 85/*U*/, 43/*+*/, // Unicode
|
|
2, 0, 16, 4, 4, 92/*\*/, 117/*u*/, // Java
|
|
2, 0, 16, 8, 8, 92/*\*/, 85/*U*/, // C (surrogates)
|
|
3, 1, 16, 1, 6, 38/*&*/, 35/*#*/, 120/*x*/, 59/*;*/, // XML
|
|
2, 1, 10, 1, 7, 38/*&*/, 35/*#*/, 59/*;*/, // XML10
|
|
3, 1, 16, 1, 6, 92/*\*/, 120/*x*/, 123/*{*/, 125/*}*/, // Perl
|
|
END
|
|
};
|
|
|
|
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(UnescapeTransliterator)
|
|
|
|
static UChar* copySpec(const UChar* spec) {
|
|
int32_t len = 0;
|
|
while (spec[len] != END) {
|
|
++len;
|
|
}
|
|
++len;
|
|
UChar *result = (UChar *)uprv_malloc(len*sizeof(UChar));
|
|
// Check for memory allocation error.
|
|
if (result != NULL) {
|
|
uprv_memcpy(result, spec, (size_t)len*sizeof(result[0]));
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Factory methods. Ignore the context.
|
|
*/
|
|
static Transliterator* _createUnicode(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_Unicode);
|
|
}
|
|
static Transliterator* _createJava(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_Java);
|
|
}
|
|
static Transliterator* _createC(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_C);
|
|
}
|
|
static Transliterator* _createXML(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_XML);
|
|
}
|
|
static Transliterator* _createXML10(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_XML10);
|
|
}
|
|
static Transliterator* _createPerl(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_Perl);
|
|
}
|
|
static Transliterator* _createAny(const UnicodeString& ID, Transliterator::Token /*context*/) {
|
|
return new UnescapeTransliterator(ID, SPEC_Any);
|
|
}
|
|
|
|
/**
|
|
* Registers standard variants with the system. Called by
|
|
* Transliterator during initialization.
|
|
*/
|
|
void UnescapeTransliterator::registerIDs() {
|
|
Token t = integerToken(0);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Unicode"), _createUnicode, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Java"), _createJava, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/C"), _createC, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/XML"), _createXML, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/XML10"), _createXML10, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any/Perl"), _createPerl, t);
|
|
|
|
Transliterator::_registerFactory(UNICODE_STRING_SIMPLE("Hex-Any"), _createAny, t);
|
|
}
|
|
|
|
/**
|
|
* Constructor. Takes the encoded spec array.
|
|
*/
|
|
UnescapeTransliterator::UnescapeTransliterator(const UnicodeString& newID,
|
|
const UChar *newSpec) :
|
|
Transliterator(newID, NULL)
|
|
{
|
|
this->spec = copySpec(newSpec);
|
|
}
|
|
|
|
/**
|
|
* Copy constructor.
|
|
*/
|
|
UnescapeTransliterator::UnescapeTransliterator(const UnescapeTransliterator& o) :
|
|
Transliterator(o) {
|
|
this->spec = copySpec(o.spec);
|
|
}
|
|
|
|
UnescapeTransliterator::~UnescapeTransliterator() {
|
|
uprv_free(spec);
|
|
}
|
|
|
|
/**
|
|
* Transliterator API.
|
|
*/
|
|
UnescapeTransliterator* UnescapeTransliterator::clone() const {
|
|
return new UnescapeTransliterator(*this);
|
|
}
|
|
|
|
/**
|
|
* Implements {@link Transliterator#handleTransliterate}.
|
|
*/
|
|
void UnescapeTransliterator::handleTransliterate(Replaceable& text, UTransPosition& pos,
|
|
UBool isIncremental) const {
|
|
int32_t start = pos.start;
|
|
int32_t limit = pos.limit;
|
|
int32_t i, ipat;
|
|
|
|
while (start < limit) {
|
|
// Loop over the forms in spec[]. Exit this loop when we
|
|
// match one of the specs. Exit the outer loop if a
|
|
// partial match is detected and isIncremental is true.
|
|
for (ipat=0; spec[ipat] != END;) {
|
|
|
|
// Read the header
|
|
int32_t prefixLen = spec[ipat++];
|
|
int32_t suffixLen = spec[ipat++];
|
|
int8_t radix = (int8_t) spec[ipat++];
|
|
int32_t minDigits = spec[ipat++];
|
|
int32_t maxDigits = spec[ipat++];
|
|
|
|
// s is a copy of start that is advanced over the
|
|
// characters as we parse them.
|
|
int32_t s = start;
|
|
UBool match = true;
|
|
|
|
for (i=0; i<prefixLen; ++i) {
|
|
if (s >= limit) {
|
|
if (i > 0) {
|
|
// We've already matched a character. This is
|
|
// a partial match, so we return if in
|
|
// incremental mode. In non-incremental mode,
|
|
// go to the next spec.
|
|
if (isIncremental) {
|
|
goto exit;
|
|
}
|
|
match = false;
|
|
break;
|
|
}
|
|
}
|
|
UChar c = text.charAt(s++);
|
|
if (c != spec[ipat + i]) {
|
|
match = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (match) {
|
|
UChar32 u = 0;
|
|
int32_t digitCount = 0;
|
|
for (;;) {
|
|
if (s >= limit) {
|
|
// Check for partial match in incremental mode.
|
|
if (s > start && isIncremental) {
|
|
goto exit;
|
|
}
|
|
break;
|
|
}
|
|
UChar32 ch = text.char32At(s);
|
|
int32_t digit = u_digit(ch, radix);
|
|
if (digit < 0) {
|
|
break;
|
|
}
|
|
s += U16_LENGTH(ch);
|
|
u = (u * radix) + digit;
|
|
if (++digitCount == maxDigits) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
match = (digitCount >= minDigits);
|
|
|
|
if (match) {
|
|
for (i=0; i<suffixLen; ++i) {
|
|
if (s >= limit) {
|
|
// Check for partial match in incremental mode.
|
|
if (s > start && isIncremental) {
|
|
goto exit;
|
|
}
|
|
match = false;
|
|
break;
|
|
}
|
|
UChar c = text.charAt(s++);
|
|
if (c != spec[ipat + prefixLen + i]) {
|
|
match = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (match) {
|
|
// At this point, we have a match
|
|
UnicodeString str(u);
|
|
text.handleReplaceBetween(start, s, str);
|
|
limit -= s - start - str.length();
|
|
// The following break statement leaves the
|
|
// loop that is traversing the forms in
|
|
// spec[]. We then parse the next input
|
|
// character.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
ipat += prefixLen + suffixLen;
|
|
}
|
|
|
|
if (start < limit) {
|
|
start += U16_LENGTH(text.char32At(start));
|
|
}
|
|
}
|
|
|
|
exit:
|
|
pos.contextLimit += limit - pos.limit;
|
|
pos.limit = limit;
|
|
pos.start = start;
|
|
}
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_TRANSLITERATION */
|
|
|
|
//eof
|