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Location: cpp/openttd-patchpack/source/src/string.cpp - annotation
r28645:c09eac136c46
31.7 KiB
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Change: Link houses production on industry chain graph by TPE_PASSENGERS or TPE_MAIL cargo.
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* 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 "error_func.h"
#include "string_func.h"
#include "string_base.h"
#include "table/control_codes.h"
#include <sstream>
#include <iomanip>
#ifdef _MSC_VER
# define strncasecmp strnicmp
#endif
#ifdef _WIN32
# include "os/windows/win32.h"
#endif
#ifdef WITH_UNISCRIBE
# include "os/windows/string_uniscribe.h"
#endif
#ifdef WITH_ICU_I18N
/* Required by StrNaturalCompare. */
# include <unicode/ustring.h>
# include "language.h"
# include "gfx_func.h"
#endif /* WITH_ICU_I18N */
#if defined(WITH_COCOA)
# include "os/macosx/string_osx.h"
#endif
#include "safeguards.h"
/**
* 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 nullptr 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)
FatalError("String too long for destination buffer");
#else /* STRGEN || SETTINGSGEN */
Debug(misc, 0, "String too long for destination buffer");
#endif /* STRGEN || SETTINGSGEN */
}
return dst;
}
/**
* Format a byte array into a continuous hex string.
* @param data Array to format
* @return Converted string.
*/
std::string FormatArrayAsHex(std::span<const byte> data)
{
std::string str;
str.reserve(data.size() * 2 + 1);
for (auto b : data) {
fmt::format_to(std::back_inserter(str), "{:02X}", b);
}
return str;
}
/**
* Copies the valid (UTF-8) characters from \c str up to \c last to the \c dst.
* Depending on the \c settings invalid characters can be replaced with a
* question mark, as well as determining what characters are deemed invalid.
*
* It is allowed for \c dst to be the same as \c src, in which case the string
* is make valid in place.
* @param dst The destination to write to.
* @param str The string to validate.
* @param last The last valid character of str.
* @param settings The settings for the string validation.
*/
template <class T>
static void StrMakeValid(T &dst, const char *str, const char *last, StringValidationSettings settings)
{
/* Assume the ABSOLUTE WORST to be in str as it comes from the outside. */
while (str <= last && *str != '\0') {
size_t len = Utf8EncodedCharLen(*str);
char32_t c;
/* If the first byte does not look like the first byte of an encoded
* character, i.e. encoded length is 0, then this byte is definitely bad
* and it should be skipped.
* When the first byte looks like the first byte of an encoded character,
* then the remaining bytes in the string are checked whether the whole
* encoded character can be there. If that is not the case, this byte is
* skipped.
* Finally we attempt to decode the encoded character, which does certain
* extra validations to see whether the correct number of bytes were used
* to encode the character. If that is not the case, the byte is probably
* invalid and it is skipped. We could emit a question mark, but then the
* logic below cannot just copy bytes, it would need to re-encode the
* decoded characters as the length in bytes may have changed.
*
* The goals here is to get as much valid Utf8 encoded characters from the
* source string to the destination string.
*
* Note: a multi-byte encoded termination ('\0') will trigger the encoded
* char length and the decoded length to differ, so it will be ignored as
* invalid character data. If it were to reach the termination, then we
* would also reach the "last" byte of the string and a normal '\0'
* termination will be placed after it.
*/
if (len == 0 || str + len > last + 1 || len != Utf8Decode(&c, str)) {
/* Maybe the next byte is still a valid character? */
str++;
continue;
}
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;
}
str += len;
if ((settings & SVS_REPLACE_TAB_CR_NL_WITH_SPACE) != 0 && (c == '\r' || c == '\n' || c == '\t')) {
/* Replace the tab, carriage return or newline with a space. */
*dst++ = ' ';
} else if ((settings & SVS_REPLACE_WITH_QUESTION_MARK) != 0) {
/* Replace the undesirable character with a question mark */
*dst++ = '?';
}
}
}
/* String termination, if needed, is left to the caller of this function. */
}
/**
* Scans the string for invalid characters and replaces then 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 StrMakeValidInPlace(char *str, const char *last, StringValidationSettings settings)
{
char *dst = str;
StrMakeValid(dst, str, last, settings);
*dst = '\0';
}
/**
* Scans the string for invalid characters and replaces then with a
* question mark '?' (if not ignored).
* Only use this function when you are sure the string ends with a '\0';
* otherwise use StrMakeValidInPlace(str, last, settings) variant.
* @param str The string (of which you are sure ends with '\0') to validate.
*/
void StrMakeValidInPlace(char *str, StringValidationSettings settings)
{
/* We know it is '\0' terminated. */
StrMakeValidInPlace(str, str + strlen(str), settings);
}
/**
* Copies the valid (UTF-8) characters from \c str to the returned string.
* Depending on the \c settings invalid characters can be replaced with a
* question mark, as well as determining what characters are deemed invalid.
* @param str The string to validate.
* @param settings The settings for the string validation.
*/
std::string StrMakeValid(std::string_view str, StringValidationSettings settings)
{
if (str.empty()) return {};
auto buf = str.data();
auto last = buf + str.size() - 1;
std::ostringstream dst;
std::ostreambuf_iterator<char> dst_iter(dst);
StrMakeValid(dst_iter, buf, last, settings);
return dst.str();
}
/**
* 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;
char32_t c;
len = Utf8Decode(&c, str);
if (!IsPrintable(c) || (c >= SCC_SPRITE_START && c <= SCC_SPRITE_END)) {
return false;
}
str += len;
}
return *str == '\0';
}
/**
* Trim the spaces from the begin of given string in place, i.e. the string buffer
* that is passed will be modified whenever spaces exist in the given string.
* When there are spaces at the begin, the whole string is moved forward.
* @param str The string to perform the in place left trimming on.
*/
static void StrLeftTrimInPlace(std::string &str)
{
size_t pos = str.find_first_not_of(' ');
str.erase(0, pos);
}
/**
* Trim the spaces from the end of given string in place, i.e. the string buffer
* that is passed will be modified whenever spaces exist in the given string.
* When there are spaces at the end, the '\0' will be moved forward.
* @param str The string to perform the in place left trimming on.
*/
static void StrRightTrimInPlace(std::string &str)
{
size_t pos = str.find_last_not_of(' ');
if (pos != std::string::npos) str.erase(pos + 1);
}
/**
* Trim the spaces from given string in place, i.e. the string buffer that
* is passed will be modified whenever spaces exist in the given string.
* When there are spaces at the begin, the whole string is moved forward
* and when there are spaces at the back the '\0' termination is moved.
* @param str The string to perform the in place trimming on.
*/
void StrTrimInPlace(std::string &str)
{
StrLeftTrimInPlace(str);
StrRightTrimInPlace(str);
}
/**
* Check whether the given string starts with the given prefix, ignoring case.
* @param str The string to look at.
* @param prefix The prefix to look for.
* @return True iff the begin of the string is the same as the prefix, ignoring case.
*/
bool StrStartsWithIgnoreCase(std::string_view str, const std::string_view prefix)
{
if (str.size() < prefix.size()) return false;
return StrEqualsIgnoreCase(str.substr(0, prefix.size()), prefix);
}
/** Case insensitive implementation of the standard character type traits. */
struct CaseInsensitiveCharTraits : public std::char_traits<char> {
static bool eq(char c1, char c2) { return toupper(c1) == toupper(c2); }
static bool ne(char c1, char c2) { return toupper(c1) != toupper(c2); }
static bool lt(char c1, char c2) { return toupper(c1) < toupper(c2); }
static int compare(const char *s1, const char *s2, size_t n)
{
while (n-- != 0) {
if (toupper(*s1) < toupper(*s2)) return -1;
if (toupper(*s1) > toupper(*s2)) return 1;
++s1; ++s2;
}
return 0;
}
static const char *find(const char *s, size_t n, char a)
{
for (; n > 0; --n, ++s) {
if (toupper(*s) == toupper(a)) return s;
}
return nullptr;
}
};
/** Case insensitive string view. */
typedef std::basic_string_view<char, CaseInsensitiveCharTraits> CaseInsensitiveStringView;
/**
* Check whether the given string ends with the given suffix, ignoring case.
* @param str The string to look at.
* @param suffix The suffix to look for.
* @return True iff the end of the string is the same as the suffix, ignoring case.
*/
bool StrEndsWithIgnoreCase(std::string_view str, const std::string_view suffix)
{
if (str.size() < suffix.size()) return false;
return StrEqualsIgnoreCase(str.substr(str.size() - suffix.size()), suffix);
}
/**
* Compares two string( view)s, while ignoring the case of the characters.
* @param str1 The first string.
* @param str2 The second string.
* @return Less than zero if str1 < str2, zero if str1 == str2, greater than
* zero if str1 > str2. All ignoring the case of the characters.
*/
int StrCompareIgnoreCase(const std::string_view str1, const std::string_view str2)
{
CaseInsensitiveStringView ci_str1{ str1.data(), str1.size() };
CaseInsensitiveStringView ci_str2{ str2.data(), str2.size() };
return ci_str1.compare(ci_str2);
}
/**
* Compares two string( view)s for equality, while ignoring the case of the characters.
* @param str1 The first string.
* @param str2 The second string.
* @return True iff both strings are equal, barring the case of the characters.
*/
bool StrEqualsIgnoreCase(const std::string_view str1, const std::string_view str2)
{
if (str1.size() != str2.size()) return false;
return StrCompareIgnoreCase(str1, str2) == 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;
}
/**
* 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 std::string &str)
{
return Utf8StringLength(str.c_str());
}
bool strtolower(std::string &str, std::string::size_type offs)
{
bool changed = false;
for (auto ch = str.begin() + offs; ch != str.end(); ++ch) {
auto new_ch = static_cast<char>(tolower(static_cast<unsigned char>(*ch)));
changed |= new_ch != *ch;
*ch = new_ch;
}
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(char32_t 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_NUMERAL_SIGNED: 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();
}
}
/* 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(char32_t *c, const char *s)
{
assert(c != nullptr);
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;
}
}
*c = '?';
return 1;
}
/**
* Encode a unicode character and place it in the buffer.
* @tparam T Type of the buffer.
* @param buf Buffer to place character.
* @param c Unicode character to encode.
* @return Number of characters in the encoded sequence.
*/
template <class T>
inline size_t Utf8Encode(T buf, char32_t 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;
}
*buf = '?';
return 1;
}
size_t Utf8Encode(char *buf, char32_t c)
{
return Utf8Encode<char *>(buf, c);
}
size_t Utf8Encode(std::ostreambuf_iterator<char> &buf, char32_t c)
{
return Utf8Encode<std::ostreambuf_iterator<char> &>(buf, c);
}
size_t Utf8Encode(std::back_insert_iterator<std::string> &buf, char32_t c)
{
return Utf8Encode<std::back_insert_iterator<std::string> &>(buf, c);
}
/**
* 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 nullptr;
}
#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 std::string_view SkipGarbage(std::string_view str)
{
while (!str.empty() && (str[0] < '0' || IsInsideMM(str[0], ';', '@' + 1) || IsInsideMM(str[0], '[', '`' + 1) || IsInsideMM(str[0], '{', '~' + 1))) str.remove_prefix(1);
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 StrNaturalCompare(std::string_view s1, std::string_view s2, bool ignore_garbage_at_front)
{
if (ignore_garbage_at_front) {
s1 = SkipGarbage(s1);
s2 = SkipGarbage(s2);
}
#ifdef WITH_ICU_I18N
if (_current_collator) {
UErrorCode status = U_ZERO_ERROR;
int result = _current_collator->compareUTF8(icu::StringPiece(s1.data(), s1.size()), icu::StringPiece(s2.data(), s2.size()), 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 StrCompareIgnoreCase(s1, s2);
}
#ifdef WITH_ICU_I18N
#include <unicode/stsearch.h>
/**
* Search if a string is contained in another string using the current locale.
*
* @param str String to search in.
* @param value String to search for.
* @param case_insensitive Search case-insensitive.
* @return 1 if value was found, 0 if it was not found, or -1 if not supported by the OS.
*/
static int ICUStringContains(const std::string_view str, const std::string_view value, bool case_insensitive)
{
if (_current_collator) {
std::unique_ptr<icu::RuleBasedCollator> coll(dynamic_cast<icu::RuleBasedCollator *>(_current_collator->clone()));
if (coll) {
UErrorCode status = U_ZERO_ERROR;
coll->setStrength(case_insensitive ? icu::Collator::SECONDARY : icu::Collator::TERTIARY);
coll->setAttribute(UCOL_NUMERIC_COLLATION, UCOL_OFF, status);
auto u_str = icu::UnicodeString::fromUTF8(icu::StringPiece(str.data(), str.size()));
auto u_value = icu::UnicodeString::fromUTF8(icu::StringPiece(value.data(), value.size()));
icu::StringSearch u_searcher(u_value, u_str, coll.get(), nullptr, status);
if (U_SUCCESS(status)) {
auto pos = u_searcher.first(status);
if (U_SUCCESS(status)) return pos != USEARCH_DONE ? 1 : 0;
}
}
}
return -1;
}
#endif /* WITH_ICU_I18N */
/**
* Checks if a string is contained in another string with a locale-aware comparison that is case sensitive.
*
* @param str The string to search in.
* @param value The string to search for.
* @return True if a match was found.
*/
[[nodiscard]] bool StrNaturalContains(const std::string_view str, const std::string_view value)
{
#ifdef WITH_ICU_I18N
int res_u = ICUStringContains(str, value, false);
if (res_u >= 0) return res_u > 0;
#endif /* WITH_ICU_I18N */
#if defined(_WIN32) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = Win32StringContains(str, value, false);
if (res >= 0) return res > 0;
#endif
#if defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = MacOSStringContains(str, value, false);
if (res >= 0) return res > 0;
#endif
return str.find(value) != std::string_view::npos;
}
/**
* Checks if a string is contained in another string with a locale-aware comparison that is case insensitive.
*
* @param str The string to search in.
* @param value The string to search for.
* @return True if a match was found.
*/
[[nodiscard]] bool StrNaturalContainsIgnoreCase(const std::string_view str, const std::string_view value)
{
#ifdef WITH_ICU_I18N
int res_u = ICUStringContains(str, value, true);
if (res_u >= 0) return res_u > 0;
#endif /* WITH_ICU_I18N */
#if defined(_WIN32) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = Win32StringContains(str, value, true);
if (res >= 0) return res > 0;
#endif
#if defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN)
int res = MacOSStringContains(str, value, true);
if (res >= 0) return res > 0;
#endif
CaseInsensitiveStringView ci_str{ str.data(), str.size() };
CaseInsensitiveStringView ci_value{ value.data(), value.size() };
return ci_str.find(ci_value) != CaseInsensitiveStringView::npos;
}
/**
* Convert a single hex-nibble to a byte.
*
* @param c The hex-nibble to convert.
* @return The byte the hex-nibble represents, or -1 if it is not a valid hex-nibble.
*/
static int ConvertHexNibbleToByte(char c)
{
if (c >= '0' && c <= '9') return c - '0';
if (c >= 'A' && c <= 'F') return c + 10 - 'A';
if (c >= 'a' && c <= 'f') return c + 10 - 'a';
return -1;
}
/**
* Convert a hex-string to a byte-array, while validating it was actually hex.
*
* @param hex The hex-string to convert.
* @param bytes The byte-array to write the result to.
*
* @note The length of the hex-string has to be exactly twice that of the length
* of the byte-array, otherwise conversion will fail.
*
* @return True iff the hex-string was valid and the conversion succeeded.
*/
bool ConvertHexToBytes(std::string_view hex, std::span<uint8_t> bytes)
{
if (bytes.size() != hex.size() / 2) {
return false;
}
/* Hex-string lengths are always divisible by 2. */
if (hex.size() % 2 != 0) {
return false;
}
for (size_t i = 0; i < hex.size() / 2; i++) {
auto hi = ConvertHexNibbleToByte(hex[i * 2]);
auto lo = ConvertHexNibbleToByte(hex[i * 2 + 1]);
if (hi < 0 || lo < 0) {
return false;
}
bytes[i] = (hi << 4) | lo;
}
return true;
}
#ifdef WITH_UNISCRIBE
/* static */ std::unique_ptr<StringIterator> StringIterator::Create()
{
return std::make_unique<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.
std::vector<UChar> utf16_str; ///< UTF-16 copy of the string.
std::vector<size_t> utf16_to_utf8; ///< Mapping from UTF-16 code point position to index in the UTF-8 source string.
public:
IcuStringIterator() : char_itr(nullptr), word_itr(nullptr)
{
UErrorCode status = U_ZERO_ERROR;
this->char_itr = icu::BreakIterator::createCharacterInstance(icu::Locale(_current_language != nullptr ? _current_language->isocode : "en"), status);
this->word_itr = icu::BreakIterator::createWordInstance(icu::Locale(_current_language != nullptr ? _current_language->isocode : "en"), status);
this->utf16_str.push_back('\0');
this->utf16_to_utf8.push_back(0);
}
~IcuStringIterator() override
{
delete this->char_itr;
delete this->word_itr;
}
void SetString(const char *s) override
{
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;
char32_t c = Utf8Consume(&s);
if (c < 0x10000) {
this->utf16_str.push_back((UChar)c);
} else {
/* Make a surrogate pair. */
this->utf16_str.push_back((UChar)(0xD800 + ((c - 0x10000) >> 10)));
this->utf16_str.push_back((UChar)(0xDC00 + ((c - 0x10000) & 0x3FF)));
this->utf16_to_utf8.push_back(idx);
}
this->utf16_to_utf8.push_back(idx);
}
this->utf16_str.push_back('\0');
this->utf16_to_utf8.push_back(s - string_base);
UText text = UTEXT_INITIALIZER;
UErrorCode status = U_ZERO_ERROR;
utext_openUChars(&text, this->utf16_str.data(), this->utf16_str.size() - 1, &status);
this->char_itr->setText(&text, status);
this->word_itr->setText(&text, status);
this->char_itr->first();
this->word_itr->first();
}
size_t SetCurPosition(size_t pos) override
{
/* Convert incoming position to an UTF-16 string index. */
uint utf16_pos = 0;
for (uint i = 0; i < this->utf16_to_utf8.size(); 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()];
}
size_t Next(IterType what) override
{
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_t *)&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];
}
size_t Prev(IterType what) override
{
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_t *)&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 */ std::unique_ptr<StringIterator> StringIterator::Create()
{
return std::make_unique<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(nullptr), len(0), cur_pos(0)
{
}
void SetString(const char *s) override
{
this->string = s;
this->len = strlen(s);
this->cur_pos = 0;
}
size_t SetCurPosition(size_t pos) override
{
assert(this->string != nullptr && 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;
}
size_t Next(IterType what) override
{
assert(this->string != nullptr);
/* Already at the end? */
if (this->cur_pos >= this->len) return END;
switch (what) {
case ITER_CHARACTER: {
char32_t c;
this->cur_pos += Utf8Decode(&c, this->string + this->cur_pos);
return this->cur_pos;
}
case ITER_WORD: {
char32_t 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;
}
size_t Prev(IterType what) override
{
assert(this->string != nullptr);
/* 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;
char32_t 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 */ std::unique_ptr<StringIterator> StringIterator::Create()
{
std::unique_ptr<StringIterator> i = OSXStringIterator::Create();
if (i != nullptr) return i;
return std::make_unique<DefaultStringIterator>();
}
#else
/* static */ std::unique_ptr<StringIterator> StringIterator::Create()
{
return std::make_unique<DefaultStringIterator>();
}
#endif /* defined(WITH_COCOA) && !defined(STRGEN) && !defined(SETTINGSGEN) */
#endif
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