scuffed-code/icu4c/source/i18n/name2uni.cpp

195 lines
6.2 KiB
C++

/*
**********************************************************************
* Copyright (C) 2001, International Business Machines
* Corporation and others. All Rights Reserved.
**********************************************************************
* Date Name Description
* 06/07/01 aliu Creation.
**********************************************************************
*/
#include "unicode/unifilt.h"
#include "unicode/uchar.h"
#include "name2uni.h"
// As of Unicode 3.0.0, the longest name is 83 characters long.
#define LONGEST_NAME 83
U_NAMESPACE_BEGIN
const char NameUnicodeTransliterator::fgClassID=0;
const char NameUnicodeTransliterator::_ID[] = "Name-Any";
/**
* Constructs a transliterator.
*/
NameUnicodeTransliterator::NameUnicodeTransliterator(
UChar32 openDelim, UChar32 closeDelim,
UnicodeFilter* adoptedFilter) :
Transliterator(_ID, adoptedFilter),
openDelimiter(openDelim),
closeDelimiter(closeDelim) {
}
/**
* Constructs a transliterator with the default delimiters '{' and
* '}'.
*/
NameUnicodeTransliterator::NameUnicodeTransliterator(UnicodeFilter* adoptedFilter) :
Transliterator(_ID, adoptedFilter),
openDelimiter((UChar) 0x007B /*{*/),
closeDelimiter((UChar) 0x007D /*}*/) {
}
/**
* Destructor.
*/
NameUnicodeTransliterator::~NameUnicodeTransliterator() {}
/**
* Copy constructor.
*/
NameUnicodeTransliterator::NameUnicodeTransliterator(const NameUnicodeTransliterator& o) :
Transliterator(o),
openDelimiter(o.openDelimiter),
closeDelimiter(o.closeDelimiter) {}
/**
* Assignment operator.
*/
NameUnicodeTransliterator& NameUnicodeTransliterator::operator=(
const NameUnicodeTransliterator& o) {
Transliterator::operator=(o);
openDelimiter = o.openDelimiter;
closeDelimiter = o.closeDelimiter;
return *this;
}
/**
* Transliterator API.
*/
Transliterator* NameUnicodeTransliterator::clone(void) const {
return new NameUnicodeTransliterator(*this);
}
/**
* Implements {@link Transliterator#handleTransliterate}.
*/
void NameUnicodeTransliterator::handleTransliterate(Replaceable& text, UTransPosition& offsets,
UBool isIncremental) const {
// Accomodate the longest possible name plus padding
UChar buf[LONGEST_NAME + 8];
char cbuf[LONGEST_NAME + 8]; // Default converter
// The only characters used in names are (as of Unicode 3.0.0):
// -0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
// (first character is a space).
int32_t cursor = offsets.start;
int32_t limit = offsets.limit;
// Modes:
// 0 - looking for open delimiter
// 1 - after open delimiter
int32_t mode = 0;
int32_t ibuf = 0;
int32_t openPos = offsets.start; // position of openDelimiter
UnicodeString str;
UChar32 c;
for (; cursor < limit; cursor+=UTF_CHAR_LENGTH(c)) {
c = text.char32At(cursor);
switch (mode) {
case 0: // looking for open delimiter
if (c == openDelimiter) {
openPos = cursor;
mode = 1;
ibuf = 0;
}
break;
case 1: // after open delimiter
// Look for [-a-zA-Z0-9<>]. If \s+ is found, convert it
// to a single space. If closeDelimiter is found, exit
// the loop. If any other character is found, exit the
// loop. If the limit is found, exit the loop.
if (u_isWhitespace(c)) {
// Ignore leading whitespace
if (ibuf != 0 && buf[ibuf-1] != (UChar)0x0020) {
buf[ibuf++] = (UChar)0x0020 /* */;
// If we go a bit past the longest possible name then abort
if (ibuf == (LONGEST_NAME + 4)) {
mode = 0;
}
}
continue;
}
if (c == closeDelimiter) {
// Delete trailing space, if any
if (ibuf > 0 && buf[ibuf-1] == (UChar)0x0020) {
--ibuf;
}
buf[ibuf] = 0; // Add terminating zero
UErrorCode status = U_ZERO_ERROR;
UChar32 ch;
u_UCharsToChars(buf, cbuf, ibuf+1);
ch = u_charFromName(U_EXTENDED_CHAR_NAME, cbuf, &status);
if (U_SUCCESS(status)) {
// Lookup succeeded
str.truncate(0);
str.append(ch);
text.handleReplaceBetween(openPos, cursor+1, str);
// Adjust indices for the change in the length of
// the string. Do not assume that str.length() ==
// 1, in case of surrogates.
int32_t delta = cursor + 1 - openPos - str.length();
cursor -= delta;
limit -= delta;
// assert(cursor == openPos + str.length());
}
// If the lookup failed, we leave things as-is and
// still switch to mode 0 and continue.
mode = 0;
continue;
}
// Check if c =~ [-A-Za-z0-9<> ]
if (c == (UChar)0x002D ||
(c >= (UChar)0x0041 && c <= (UChar)0x005A) ||
(c >= (UChar)0x0061 && c <= (UChar)0x007A) ||
(c >= (UChar)0x0030 && c <= (UChar)0x0039) ||
c == (UChar)0x003C || c == (UChar)0x003E) {
buf[ibuf++] = (char) c;
// If we go a bit past the longest possible name then abort
if (ibuf == (LONGEST_NAME + 4)) {
mode = 0;
}
}
// Invalid character
else {
--cursor; // Backup and reprocess this character
mode = 0;
}
break;
}
}
offsets.contextLimit += limit - offsets.limit;
offsets.limit = limit;
// In incremental mode, only advance the cursor up to the last
// open delimiter, if we are in mode 1.
offsets.start = (mode == 1 && isIncremental) ? openPos : cursor;
}
U_NAMESPACE_END