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Location: cpp/openttd-patchpack/source/src/string.cpp - annotation
r23517:1a32c3c14728
25.6 KiB
text/x-c
Codechange: Replace SmallVector::Clear() with std::vector::clear()
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r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20614:4513b7ad6147 r20614:4513b7ad6147 r20615:a9017d659ca9 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20615:a9017d659ca9 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r23076:0f2a2b9683fd r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r20614:4513b7ad6147 r23076:0f2a2b9683fd r20614:4513b7ad6147 r20614:4513b7ad6147 | /* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file string.cpp Handling of C-type strings (char*). */
#include "stdafx.h"
#include "debug.h"
#include "core/alloc_func.hpp"
#include "core/math_func.hpp"
#include "string_func.h"
#include "string_base.h"
#include "table/control_codes.h"
#include <stdarg.h>
#include <ctype.h> /* required for tolower() */
#ifdef _MSC_VER
#include <errno.h> // required by vsnprintf implementation for MSVC
#endif
#ifdef _WIN32
#include "os/windows/win32.h"
#endif
#ifdef WITH_UNISCRIBE
#include "os/windows/string_uniscribe.h"
#endif
#if defined(WITH_COCOA)
#include "os/macosx/string_osx.h"
#endif
#ifdef WITH_ICU_I18N
/* Required by strnatcmp. */
#include <unicode/ustring.h>
#include "language.h"
#include "gfx_func.h"
#endif /* WITH_ICU_I18N */
/* The function vsnprintf is used internally to perform the required formatting
* tasks. As such this one must be allowed, and makes sure it's terminated. */
#include "safeguards.h"
#undef vsnprintf
/**
* Safer implementation of vsnprintf; same as vsnprintf except:
* - last instead of size, i.e. replace sizeof with lastof.
* - return gives the amount of characters added, not what it would add.
* @param str buffer to write to up to last
* @param last last character we may write to
* @param format the formatting (see snprintf)
* @param ap the list of arguments for the format
* @return the number of added characters
*/
int CDECL vseprintf(char *str, const char *last, const char *format, va_list ap)
{
ptrdiff_t diff = last - str;
if (diff < 0) return 0;
return min((int)diff, vsnprintf(str, diff + 1, format, ap));
}
/**
* Appends characters from one string to another.
*
* Appends the source string to the destination string with respect of the
* terminating null-character and and the last pointer to the last element
* in the destination buffer. If the last pointer is set to NULL no
* boundary check is performed.
*
* @note usage: strecat(dst, src, lastof(dst));
* @note lastof() applies only to fixed size arrays
*
* @param dst The buffer containing the target string
* @param src The buffer containing the string to append
* @param last The pointer to the last element of the destination buffer
* @return The pointer to the terminating null-character in the destination buffer
*/
char *strecat(char *dst, const char *src, const char *last)
{
assert(dst <= last);
while (*dst != '\0') {
if (dst == last) return dst;
dst++;
}
return strecpy(dst, src, last);
}
/**
* Copies characters from one buffer to another.
*
* Copies the source string to the destination buffer with respect of the
* terminating null-character and the last pointer to the last element in
* the destination buffer. If the last pointer is set to NULL no boundary
* check is performed.
*
* @note usage: strecpy(dst, src, lastof(dst));
* @note lastof() applies only to fixed size arrays
*
* @param dst The destination buffer
* @param src The buffer containing the string to copy
* @param last The pointer to the last element of the destination buffer
* @return The pointer to the terminating null-character in the destination buffer
*/
char *strecpy(char *dst, const char *src, const char *last)
{
assert(dst <= last);
while (dst != last && *src != '\0') {
*dst++ = *src++;
}
*dst = '\0';
if (dst == last && *src != '\0') {
#if defined(STRGEN) || defined(SETTINGSGEN)
error("String too long for destination buffer");
#else /* STRGEN || SETTINGSGEN */
DEBUG(misc, 0, "String too long for destination buffer");
#endif /* STRGEN || SETTINGSGEN */
}
return dst;
}
/**
* Create a duplicate of the given string.
* @param s The string to duplicate.
* @param last The last character that is safe to duplicate. If NULL, the whole string is duplicated.
* @note The maximum length of the resulting string might therefore be last - s + 1.
* @return The duplicate of the string.
*/
char *stredup(const char *s, const char *last)
{
size_t len = last == NULL ? strlen(s) : ttd_strnlen(s, last - s + 1);
char *tmp = CallocT<char>(len + 1);
memcpy(tmp, s, len);
return tmp;
}
/**
* Format, "printf", into a newly allocated string.
* @param str The formatting string.
* @return The formatted string. You must free this!
*/
char *CDECL str_fmt(const char *str, ...)
{
char buf[4096];
va_list va;
va_start(va, str);
int len = vseprintf(buf, lastof(buf), str, va);
va_end(va);
char *p = MallocT<char>(len + 1);
memcpy(p, buf, len + 1);
return p;
}
/**
* Scan the string for old values of SCC_ENCODED and fix it to
* it's new, static value.
* @param str the string to scan
* @param last the last valid character of str
*/
void str_fix_scc_encoded(char *str, const char *last)
{
while (str <= last && *str != '\0') {
size_t len = Utf8EncodedCharLen(*str);
if ((len == 0 && str + 4 > last) || str + len > last) break;
WChar c;
Utf8Decode(&c, str);
if (c == '\0') break;
if (c == 0xE028 || c == 0xE02A) {
c = SCC_ENCODED;
}
str += Utf8Encode(str, c);
}
*str = '\0';
}
/**
* Scans the string for valid characters and if it finds invalid ones,
* replaces them with a question mark '?' (if not ignored)
* @param str the string to validate
* @param last the last valid character of str
* @param settings the settings for the string validation.
*/
void str_validate(char *str, const char *last, StringValidationSettings settings)
{
/* Assume the ABSOLUTE WORST to be in str as it comes from the outside. */
char *dst = str;
while (str <= last && *str != '\0') {
size_t len = Utf8EncodedCharLen(*str);
/* If the character is unknown, i.e. encoded length is 0
* we assume worst case for the length check.
* The length check is needed to prevent Utf8Decode to read
* over the terminating '\0' if that happens to be placed
* within the encoding of an UTF8 character. */
if ((len == 0 && str + 4 > last) || str + len > last) break;
WChar c;
len = Utf8Decode(&c, str);
/* It's possible to encode the string termination character
* into a multiple bytes. This prevents those termination
* characters to be skipped */
if (c == '\0') break;
if ((IsPrintable(c) && (c < SCC_SPRITE_START || c > SCC_SPRITE_END)) || ((settings & SVS_ALLOW_CONTROL_CODE) != 0 && c == SCC_ENCODED)) {
/* Copy the character back. Even if dst is current the same as str
* (i.e. no characters have been changed) this is quicker than
* moving the pointers ahead by len */
do {
*dst++ = *str++;
} while (--len != 0);
} else if ((settings & SVS_ALLOW_NEWLINE) != 0 && c == '\n') {
*dst++ = *str++;
} else {
if ((settings & SVS_ALLOW_NEWLINE) != 0 && c == '\r' && str[1] == '\n') {
str += len;
continue;
}
/* Replace the undesirable character with a question mark */
str += len;
if ((settings & SVS_REPLACE_WITH_QUESTION_MARK) != 0) *dst++ = '?';
}
}
*dst = '\0';
}
/**
* Scans the string for valid characters and if it finds invalid ones,
* replaces them with a question mark '?'.
* @param str the string to validate
*/
void ValidateString(const char *str)
{
/* We know it is '\0' terminated. */
str_validate(const_cast<char *>(str), str + strlen(str) + 1);
}
/**
* Checks whether the given string is valid, i.e. contains only
* valid (printable) characters and is properly terminated.
* @param str The string to validate.
* @param last The last character of the string, i.e. the string
* must be terminated here or earlier.
*/
bool StrValid(const char *str, const char *last)
{
/* Assume the ABSOLUTE WORST to be in str as it comes from the outside. */
while (str <= last && *str != '\0') {
size_t len = Utf8EncodedCharLen(*str);
/* Encoded length is 0 if the character isn't known.
* The length check is needed to prevent Utf8Decode to read
* over the terminating '\0' if that happens to be placed
* within the encoding of an UTF8 character. */
if (len == 0 || str + len > last) return false;
WChar c;
len = Utf8Decode(&c, str);
if (!IsPrintable(c) || (c >= SCC_SPRITE_START && c <= SCC_SPRITE_END)) {
return false;
}
str += len;
}
return *str == '\0';
}
/** Scans the string for colour codes and strips them */
void str_strip_colours(char *str)
{
char *dst = str;
WChar c;
size_t len;
for (len = Utf8Decode(&c, str); c != '\0'; len = Utf8Decode(&c, str)) {
if (c < SCC_BLUE || c > SCC_BLACK) {
/* Copy the character back. Even if dst is current the same as str
* (i.e. no characters have been changed) this is quicker than
* moving the pointers ahead by len */
do {
*dst++ = *str++;
} while (--len != 0);
} else {
/* Just skip (strip) the colour codes */
str += len;
}
}
*dst = '\0';
}
/**
* Get the length of an UTF-8 encoded string in number of characters
* and thus not the number of bytes that the encoded string contains.
* @param s The string to get the length for.
* @return The length of the string in characters.
*/
size_t Utf8StringLength(const char *s)
{
size_t len = 0;
const char *t = s;
while (Utf8Consume(&t) != 0) len++;
return len;
}
/**
* Convert a given ASCII string to lowercase.
* NOTE: only support ASCII characters, no UTF8 fancy. As currently
* the function is only used to lowercase data-filenames if they are
* not found, this is sufficient. If more, or general functionality is
* needed, look to r7271 where it was removed because it was broken when
* using certain locales: eg in Turkish the uppercase 'I' was converted to
* '?', so just revert to the old functionality
* @param str string to convert
* @return String has changed.
*/
bool strtolower(char *str)
{
bool changed = false;
for (; *str != '\0'; str++) {
char new_str = tolower(*str);
changed |= new_str != *str;
*str = new_str;
}
return changed;
}
/**
* Only allow certain keys. You can define the filter to be used. This makes
* sure no invalid keys can get into an editbox, like BELL.
* @param key character to be checked
* @param afilter the filter to use
* @return true or false depending if the character is printable/valid or not
*/
bool IsValidChar(WChar key, CharSetFilter afilter)
{
switch (afilter) {
case CS_ALPHANUMERAL: return IsPrintable(key);
case CS_NUMERAL: return (key >= '0' && key <= '9');
case CS_NUMERAL_SPACE: return (key >= '0' && key <= '9') || key == ' ';
case CS_ALPHA: return IsPrintable(key) && !(key >= '0' && key <= '9');
case CS_HEXADECIMAL: return (key >= '0' && key <= '9') || (key >= 'a' && key <= 'f') || (key >= 'A' && key <= 'F');
default: NOT_REACHED();
}
}
#ifdef _WIN32
#if defined(_MSC_VER) && _MSC_VER < 1900
/**
* Almost POSIX compliant implementation of \c vsnprintf for VC compiler.
* The difference is in the value returned on output truncation. This
* implementation returns size whereas a POSIX implementation returns
* size or more (the number of bytes that would be written to str
* had size been sufficiently large excluding the terminating null byte).
*/
int CDECL vsnprintf(char *str, size_t size, const char *format, va_list ap)
{
if (size == 0) return 0;
errno = 0;
int ret = _vsnprintf(str, size, format, ap);
if (ret < 0) {
if (errno != ERANGE) {
/* There's a formatting error, better get that looked
* at properly instead of ignoring it. */
NOT_REACHED();
}
} else if ((size_t)ret < size) {
/* The buffer is big enough for the number of
* characters stored (excluding null), i.e.
* the string has been null-terminated. */
return ret;
}
/* The buffer is too small for _vsnprintf to write the
* null-terminator at its end and return size. */
str[size - 1] = '\0';
return (int)size;
}
#endif /* _MSC_VER */
#endif /* _WIN32 */
/**
* Safer implementation of snprintf; same as snprintf except:
* - last instead of size, i.e. replace sizeof with lastof.
* - return gives the amount of characters added, not what it would add.
* @param str buffer to write to up to last
* @param last last character we may write to
* @param format the formatting (see snprintf)
* @return the number of added characters
*/
int CDECL seprintf(char *str, const char *last, const char *format, ...)
{
va_list ap;
va_start(ap, format);
int ret = vseprintf(str, last, format, ap);
va_end(ap);
return ret;
}
/**
* Convert the md5sum to a hexadecimal string representation
* @param buf buffer to put the md5sum into
* @param last last character of buffer (usually lastof(buf))
* @param md5sum the md5sum itself
* @return a pointer to the next character after the md5sum
*/
char *md5sumToString(char *buf, const char *last, const uint8 md5sum[16])
{
char *p = buf;
for (uint i = 0; i < 16; i++) {
p += seprintf(p, last, "%02X", md5sum[i]);
}
return p;
}
/* UTF-8 handling routines */
/**
* Decode and consume the next UTF-8 encoded character.
* @param c Buffer to place decoded character.
* @param s Character stream to retrieve character from.
* @return Number of characters in the sequence.
*/
size_t Utf8Decode(WChar *c, const char *s)
{
assert(c != NULL);
if (!HasBit(s[0], 7)) {
/* Single byte character: 0xxxxxxx */
*c = s[0];
return 1;
} else if (GB(s[0], 5, 3) == 6) {
if (IsUtf8Part(s[1])) {
/* Double byte character: 110xxxxx 10xxxxxx */
*c = GB(s[0], 0, 5) << 6 | GB(s[1], 0, 6);
if (*c >= 0x80) return 2;
}
} else if (GB(s[0], 4, 4) == 14) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2])) {
/* Triple byte character: 1110xxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 4) << 12 | GB(s[1], 0, 6) << 6 | GB(s[2], 0, 6);
if (*c >= 0x800) return 3;
}
} else if (GB(s[0], 3, 5) == 30) {
if (IsUtf8Part(s[1]) && IsUtf8Part(s[2]) && IsUtf8Part(s[3])) {
/* 4 byte character: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
*c = GB(s[0], 0, 3) << 18 | GB(s[1], 0, 6) << 12 | GB(s[2], 0, 6) << 6 | GB(s[3], 0, 6);
if (*c >= 0x10000 && *c <= 0x10FFFF) return 4;
}
}
/* DEBUG(misc, 1, "[utf8] invalid UTF-8 sequence"); */
*c = '?';
return 1;
}
/**
* Encode a unicode character and place it in the buffer.
* @param buf Buffer to place character.
* @param c Unicode character to encode.
* @return Number of characters in the encoded sequence.
*/
size_t Utf8Encode(char *buf, WChar c)
{
if (c < 0x80) {
*buf = c;
return 1;
} else if (c < 0x800) {
*buf++ = 0xC0 + GB(c, 6, 5);
*buf = 0x80 + GB(c, 0, 6);
return 2;
} else if (c < 0x10000) {
*buf++ = 0xE0 + GB(c, 12, 4);
*buf++ = 0x80 + GB(c, 6, 6);
*buf = 0x80 + GB(c, 0, 6);
return 3;
} else if (c < 0x110000) {
*buf++ = 0xF0 + GB(c, 18, 3);
*buf++ = 0x80 + GB(c, 12, 6);
*buf++ = 0x80 + GB(c, 6, 6);
*buf = 0x80 + GB(c, 0, 6);
return 4;
}
/* DEBUG(misc, 1, "[utf8] can't UTF-8 encode value 0x%X", c); */
*buf = '?';
return 1;
}
/**
* Properly terminate an UTF8 string to some maximum length
* @param s string to check if it needs additional trimming
* @param maxlen the maximum length the buffer can have.
* @return the new length in bytes of the string (eg. strlen(new_string))
* @note maxlen is the string length _INCLUDING_ the terminating '\0'
*/
size_t Utf8TrimString(char *s, size_t maxlen)
{
size_t length = 0;
for (const char *ptr = strchr(s, '\0'); *s != '\0';) {
size_t len = Utf8EncodedCharLen(*s);
/* Silently ignore invalid UTF8 sequences, our only concern trimming */
if (len == 0) len = 1;
/* Take care when a hard cutoff was made for the string and
* the last UTF8 sequence is invalid */
if (length + len >= maxlen || (s + len > ptr)) break;
s += len;
length += len;
}
*s = '\0';
return length;
}
#ifdef DEFINE_STRCASESTR
char *strcasestr(const char *haystack, const char *needle)
{
size_t hay_len = strlen(haystack);
size_t needle_len = strlen(needle);
while (hay_len >= needle_len) {
if (strncasecmp(haystack, needle, needle_len) == 0) return const_cast<char *>(haystack);
haystack++;
hay_len--;
}
return NULL;
}
#endif /* DEFINE_STRCASESTR */
/**
* Skip some of the 'garbage' in the string that we don't want to use
* to sort on. This way the alphabetical sorting will work better as
* we would be actually using those characters instead of some other
* characters such as spaces and tildes at the begin of the name.
* @param str The string to skip the initial garbage of.
* @return The string with the garbage skipped.
*/
static const char *SkipGarbage(const char *str)
{
while (*str != '\0' && (*str < '0' || IsInsideMM(*str, ';', '@' + 1) || IsInsideMM(*str, '[', '`' + 1) || IsInsideMM(*str, '{', '~' + 1))) str++;
return str;
}
/**
* Compares two strings using case insensitive natural sort.
*
* @param s1 First string to compare.
* @param s2 Second string to compare.
* @param ignore_garbage_at_front Skip punctuation characters in the front
* @return Less than zero if s1 < s2, zero if s1 == s2, greater than zero if s1 > s2.
*/
int strnatcmp(const char *s1, const char *s2, bool ignore_garbage_at_front)
{
if (ignore_garbage_at_front) {
s1 = SkipGarbage(s1);
s2 = SkipGarbage(s2);
}
#ifdef WITH_ICU_I18N
if (_current_collator != NULL) {
UErrorCode status = U_ZERO_ERROR;
int result = _current_collator->compareUTF8(s1, s2, status);
if (U_SUCCESS(status)) return result;
}
#endif /* WITH_ICU_I18N */
#if defined(_WIN32) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = OTTDStringCompare(s1, s2);
if (res != 0) return res - 2; // Convert to normal C return values.
#endif
#if defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = MacOSStringCompare(s1, s2);
if (res != 0) return res - 2; // Convert to normal C return values.
#endif
/* Do a normal comparison if ICU is missing or if we cannot create a collator. */
return strcasecmp(s1, s2);
}
#ifdef WITH_UNISCRIBE
/* static */ StringIterator *StringIterator::Create()
{
return new UniscribeStringIterator();
}
#elif defined(WITH_ICU_I18N)
#include <unicode/utext.h>
#include <unicode/brkiter.h>
/** String iterator using ICU as a backend. */
class IcuStringIterator : public StringIterator
{
icu::BreakIterator *char_itr; ///< ICU iterator for characters.
icu::BreakIterator *word_itr; ///< ICU iterator for words.
SmallVector<UChar, 32> utf16_str; ///< UTF-16 copy of the string.
SmallVector<size_t, 32> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
public:
IcuStringIterator() : char_itr(NULL), word_itr(NULL)
{
UErrorCode status = U_ZERO_ERROR;
this->char_itr = icu::BreakIterator::createCharacterInstance(icu::Locale(_current_language != NULL ? _current_language->isocode : "en"), status);
this->word_itr = icu::BreakIterator::createWordInstance(icu::Locale(_current_language != NULL ? _current_language->isocode : "en"), status);
*this->utf16_str.Append() = '\0';
*this->utf16_to_utf8.Append() = 0;
}
virtual ~IcuStringIterator()
{
delete this->char_itr;
delete this->word_itr;
}
virtual void SetString(const char *s)
{
const char *string_base = s;
/* Unfortunately current ICU versions only provide rudimentary support
* for word break iterators (especially for CJK languages) in combination
* with UTF-8 input. As a work around we have to convert the input to
* UTF-16 and create a mapping back to UTF-8 character indices. */
this->utf16_str.clear();
this->utf16_to_utf8.clear();
while (*s != '\0') {
size_t idx = s - string_base;
WChar c = Utf8Consume(&s);
if (c < 0x10000) {
*this->utf16_str.Append() = (UChar)c;
} else {
/* Make a surrogate pair. */
*this->utf16_str.Append() = (UChar)(0xD800 + ((c - 0x10000) >> 10));
*this->utf16_str.Append() = (UChar)(0xDC00 + ((c - 0x10000) & 0x3FF));
*this->utf16_to_utf8.Append() = idx;
}
*this->utf16_to_utf8.Append() = idx;
}
*this->utf16_str.Append() = '\0';
*this->utf16_to_utf8.Append() = s - string_base;
UText text = UTEXT_INITIALIZER;
UErrorCode status = U_ZERO_ERROR;
utext_openUChars(&text, this->utf16_str.Begin(), this->utf16_str.Length() - 1, &status);
this->char_itr->setText(&text, status);
this->word_itr->setText(&text, status);
this->char_itr->first();
this->word_itr->first();
}
virtual size_t SetCurPosition(size_t pos)
{
/* Convert incoming position to an UTF-16 string index. */
uint utf16_pos = 0;
for (uint i = 0; i < this->utf16_to_utf8.Length(); i++) {
if (this->utf16_to_utf8[i] == pos) {
utf16_pos = i;
break;
}
}
/* isBoundary has the documented side-effect of setting the current
* position to the first valid boundary equal to or greater than
* the passed value. */
this->char_itr->isBoundary(utf16_pos);
return this->utf16_to_utf8[this->char_itr->current()];
}
virtual size_t Next(IterType what)
{
int32_t pos;
switch (what) {
case ITER_CHARACTER:
pos = this->char_itr->next();
break;
case ITER_WORD:
pos = this->word_itr->following(this->char_itr->current());
/* The ICU word iterator considers both the start and the end of a word a valid
* break point, but we only want word starts. Move to the next location in
* case the new position points to whitespace. */
while (pos != icu::BreakIterator::DONE &&
IsWhitespace(Utf16DecodeChar((const uint16 *)&this->utf16_str[pos]))) {
int32_t new_pos = this->word_itr->next();
/* Don't set it to DONE if it was valid before. Otherwise we'll return END
* even though the iterator wasn't at the end of the string before. */
if (new_pos == icu::BreakIterator::DONE) break;
pos = new_pos;
}
this->char_itr->isBoundary(pos);
break;
default:
NOT_REACHED();
}
return pos == icu::BreakIterator::DONE ? END : this->utf16_to_utf8[pos];
}
virtual size_t Prev(IterType what)
{
int32_t pos;
switch (what) {
case ITER_CHARACTER:
pos = this->char_itr->previous();
break;
case ITER_WORD:
pos = this->word_itr->preceding(this->char_itr->current());
/* The ICU word iterator considers both the start and the end of a word a valid
* break point, but we only want word starts. Move to the previous location in
* case the new position points to whitespace. */
while (pos != icu::BreakIterator::DONE &&
IsWhitespace(Utf16DecodeChar((const uint16 *)&this->utf16_str[pos]))) {
int32_t new_pos = this->word_itr->previous();
/* Don't set it to DONE if it was valid before. Otherwise we'll return END
* even though the iterator wasn't at the start of the string before. */
if (new_pos == icu::BreakIterator::DONE) break;
pos = new_pos;
}
this->char_itr->isBoundary(pos);
break;
default:
NOT_REACHED();
}
return pos == icu::BreakIterator::DONE ? END : this->utf16_to_utf8[pos];
}
};
/* static */ StringIterator *StringIterator::Create()
{
return new IcuStringIterator();
}
#else
/** Fallback simple string iterator. */
class DefaultStringIterator : public StringIterator
{
const char *string; ///< Current string.
size_t len; ///< String length.
size_t cur_pos; ///< Current iteration position.
public:
DefaultStringIterator() : string(NULL), len(0), cur_pos(0)
{
}
virtual void SetString(const char *s)
{
this->string = s;
this->len = strlen(s);
this->cur_pos = 0;
}
virtual size_t SetCurPosition(size_t pos)
{
assert(this->string != NULL && pos <= this->len);
/* Sanitize in case we get a position inside an UTF-8 sequence. */
while (pos > 0 && IsUtf8Part(this->string[pos])) pos--;
return this->cur_pos = pos;
}
virtual size_t Next(IterType what)
{
assert(this->string != NULL);
/* Already at the end? */
if (this->cur_pos >= this->len) return END;
switch (what) {
case ITER_CHARACTER: {
WChar c;
this->cur_pos += Utf8Decode(&c, this->string + this->cur_pos);
return this->cur_pos;
}
case ITER_WORD: {
WChar c;
/* Consume current word. */
size_t offs = Utf8Decode(&c, this->string + this->cur_pos);
while (this->cur_pos < this->len && !IsWhitespace(c)) {
this->cur_pos += offs;
offs = Utf8Decode(&c, this->string + this->cur_pos);
}
/* Consume whitespace to the next word. */
while (this->cur_pos < this->len && IsWhitespace(c)) {
this->cur_pos += offs;
offs = Utf8Decode(&c, this->string + this->cur_pos);
}
return this->cur_pos;
}
default:
NOT_REACHED();
}
return END;
}
virtual size_t Prev(IterType what)
{
assert(this->string != NULL);
/* Already at the beginning? */
if (this->cur_pos == 0) return END;
switch (what) {
case ITER_CHARACTER:
return this->cur_pos = Utf8PrevChar(this->string + this->cur_pos) - this->string;
case ITER_WORD: {
const char *s = this->string + this->cur_pos;
WChar c;
/* Consume preceding whitespace. */
do {
s = Utf8PrevChar(s);
Utf8Decode(&c, s);
} while (s > this->string && IsWhitespace(c));
/* Consume preceding word. */
while (s > this->string && !IsWhitespace(c)) {
s = Utf8PrevChar(s);
Utf8Decode(&c, s);
}
/* Move caret back to the beginning of the word. */
if (IsWhitespace(c)) Utf8Consume(&s);
return this->cur_pos = s - this->string;
}
default:
NOT_REACHED();
}
return END;
}
};
#if defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN)
/* static */ StringIterator *StringIterator::Create()
{
StringIterator *i = OSXStringIterator::Create();
if (i != NULL) return i;
return new DefaultStringIterator();
}
#else
/* static */ StringIterator *StringIterator::Create()
{
return new DefaultStringIterator();
}
#endif /* defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN) */
#endif
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