mirror of https://github.com/OpenTTD/OpenTTD.git
268 lines
8.0 KiB
C++
268 lines
8.0 KiB
C++
/*
|
|
* 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_func.h Functions related to low-level strings.
|
|
*/
|
|
|
|
#ifndef STRING_FUNC_H
|
|
#define STRING_FUNC_H
|
|
|
|
#include <iosfwd>
|
|
|
|
#include "core/bitmath_func.hpp"
|
|
#include "string_type.h"
|
|
|
|
char *strecpy(char *dst, const char *src, const char *last) NOACCESS(3);
|
|
|
|
std::string FormatArrayAsHex(std::span<const uint8_t> data);
|
|
|
|
void StrMakeValidInPlace(char *str, const char *last, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK) NOACCESS(2);
|
|
[[nodiscard]] std::string StrMakeValid(std::string_view str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
|
|
void StrMakeValidInPlace(char *str, StringValidationSettings settings = SVS_REPLACE_WITH_QUESTION_MARK);
|
|
|
|
bool strtolower(std::string &str, std::string::size_type offs = 0);
|
|
|
|
[[nodiscard]] bool StrValid(const char *str, const char *last) NOACCESS(2);
|
|
void StrTrimInPlace(std::string &str);
|
|
std::string_view StrTrimView(std::string_view str);
|
|
|
|
[[nodiscard]] bool StrStartsWithIgnoreCase(std::string_view str, const std::string_view prefix);
|
|
[[nodiscard]] bool StrEndsWithIgnoreCase(std::string_view str, const std::string_view suffix);
|
|
|
|
[[nodiscard]] int StrCompareIgnoreCase(const std::string_view str1, const std::string_view str2);
|
|
[[nodiscard]] bool StrEqualsIgnoreCase(const std::string_view str1, const std::string_view str2);
|
|
[[nodiscard]] int StrNaturalCompare(std::string_view s1, std::string_view s2, bool ignore_garbage_at_front = false);
|
|
[[nodiscard]] bool StrNaturalContains(const std::string_view str, const std::string_view value);
|
|
[[nodiscard]] bool StrNaturalContainsIgnoreCase(const std::string_view str, const std::string_view value);
|
|
|
|
bool ConvertHexToBytes(std::string_view hex, std::span<uint8_t> bytes);
|
|
|
|
/** Case insensitive comparator for strings, for example for use in std::map. */
|
|
struct CaseInsensitiveComparator {
|
|
bool operator()(const std::string_view s1, const std::string_view s2) const { return StrCompareIgnoreCase(s1, s2) < 0; }
|
|
};
|
|
|
|
/**
|
|
* Check if a string buffer is empty.
|
|
*
|
|
* @param s The pointer to the first element of the buffer
|
|
* @return true if the buffer starts with the terminating null-character or
|
|
* if the given pointer points to nullptr else return false
|
|
*/
|
|
inline bool StrEmpty(const char *s)
|
|
{
|
|
return s == nullptr || s[0] == '\0';
|
|
}
|
|
|
|
/**
|
|
* Get the length of a string, within a limited buffer.
|
|
*
|
|
* @param str The pointer to the first element of the buffer
|
|
* @param maxlen The maximum size of the buffer
|
|
* @return The length of the string
|
|
*/
|
|
inline size_t ttd_strnlen(const char *str, size_t maxlen)
|
|
{
|
|
const char *t;
|
|
for (t = str; static_cast<size_t>(t - str) < maxlen && *t != '\0'; t++) {}
|
|
return t - str;
|
|
}
|
|
|
|
bool IsValidChar(char32_t key, CharSetFilter afilter);
|
|
|
|
size_t Utf8Decode(char32_t *c, const char *s);
|
|
size_t Utf8Encode(char *buf, char32_t c);
|
|
size_t Utf8Encode(std::ostreambuf_iterator<char> &buf, char32_t c);
|
|
size_t Utf8Encode(std::back_insert_iterator<std::string> &buf, char32_t c);
|
|
size_t Utf8TrimString(char *s, size_t maxlen);
|
|
|
|
|
|
inline char32_t Utf8Consume(const char **s)
|
|
{
|
|
char32_t c;
|
|
*s += Utf8Decode(&c, *s);
|
|
return c;
|
|
}
|
|
|
|
template <class Titr>
|
|
inline char32_t Utf8Consume(Titr &s)
|
|
{
|
|
char32_t c;
|
|
s += Utf8Decode(&c, &*s);
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* Return the length of a UTF-8 encoded character.
|
|
* @param c Unicode character.
|
|
* @return Length of UTF-8 encoding for character.
|
|
*/
|
|
inline int8_t Utf8CharLen(char32_t c)
|
|
{
|
|
if (c < 0x80) return 1;
|
|
if (c < 0x800) return 2;
|
|
if (c < 0x10000) return 3;
|
|
if (c < 0x110000) return 4;
|
|
|
|
/* Invalid valid, we encode as a '?' */
|
|
return 1;
|
|
}
|
|
|
|
|
|
/**
|
|
* Return the length of an UTF-8 encoded value based on a single char. This
|
|
* char should be the first byte of the UTF-8 encoding. If not, or encoding
|
|
* is invalid, return value is 0
|
|
* @param c char to query length of
|
|
* @return requested size
|
|
*/
|
|
inline int8_t Utf8EncodedCharLen(char c)
|
|
{
|
|
if (GB(c, 3, 5) == 0x1E) return 4;
|
|
if (GB(c, 4, 4) == 0x0E) return 3;
|
|
if (GB(c, 5, 3) == 0x06) return 2;
|
|
if (GB(c, 7, 1) == 0x00) return 1;
|
|
|
|
/* Invalid UTF8 start encoding */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Check if the given character is part of a UTF8 sequence */
|
|
inline bool IsUtf8Part(char c)
|
|
{
|
|
return GB(c, 6, 2) == 2;
|
|
}
|
|
|
|
/**
|
|
* Retrieve the previous UNICODE character in an UTF-8 encoded string.
|
|
* @param s char pointer pointing to (the first char of) the next character
|
|
* @return a pointer in 's' to the previous UNICODE character's first byte
|
|
* @note The function should not be used to determine the length of the previous
|
|
* encoded char because it might be an invalid/corrupt start-sequence
|
|
*/
|
|
inline char *Utf8PrevChar(char *s)
|
|
{
|
|
char *ret = s;
|
|
while (IsUtf8Part(*--ret)) {}
|
|
return ret;
|
|
}
|
|
|
|
inline const char *Utf8PrevChar(const char *s)
|
|
{
|
|
const char *ret = s;
|
|
while (IsUtf8Part(*--ret)) {}
|
|
return ret;
|
|
}
|
|
|
|
size_t Utf8StringLength(const char *s);
|
|
size_t Utf8StringLength(const std::string &str);
|
|
|
|
/**
|
|
* Is the given character a lead surrogate code point?
|
|
* @param c The character to test.
|
|
* @return True if the character is a lead surrogate code point.
|
|
*/
|
|
inline bool Utf16IsLeadSurrogate(uint c)
|
|
{
|
|
return c >= 0xD800 && c <= 0xDBFF;
|
|
}
|
|
|
|
/**
|
|
* Is the given character a lead surrogate code point?
|
|
* @param c The character to test.
|
|
* @return True if the character is a lead surrogate code point.
|
|
*/
|
|
inline bool Utf16IsTrailSurrogate(uint c)
|
|
{
|
|
return c >= 0xDC00 && c <= 0xDFFF;
|
|
}
|
|
|
|
/**
|
|
* Convert an UTF-16 surrogate pair to the corresponding Unicode character.
|
|
* @param lead Lead surrogate code point.
|
|
* @param trail Trail surrogate code point.
|
|
* @return Decoded Unicode character.
|
|
*/
|
|
inline char32_t Utf16DecodeSurrogate(uint lead, uint trail)
|
|
{
|
|
return 0x10000 + (((lead - 0xD800) << 10) | (trail - 0xDC00));
|
|
}
|
|
|
|
/**
|
|
* Decode an UTF-16 character.
|
|
* @param c Pointer to one or two UTF-16 code points.
|
|
* @return Decoded Unicode character.
|
|
*/
|
|
inline char32_t Utf16DecodeChar(const uint16_t *c)
|
|
{
|
|
if (Utf16IsLeadSurrogate(c[0])) {
|
|
return Utf16DecodeSurrogate(c[0], c[1]);
|
|
} else {
|
|
return *c;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Is the given character a text direction character.
|
|
* @param c The character to test.
|
|
* @return true iff the character is used to influence
|
|
* the text direction.
|
|
*/
|
|
inline bool IsTextDirectionChar(char32_t c)
|
|
{
|
|
switch (c) {
|
|
case CHAR_TD_LRM:
|
|
case CHAR_TD_RLM:
|
|
case CHAR_TD_LRE:
|
|
case CHAR_TD_RLE:
|
|
case CHAR_TD_LRO:
|
|
case CHAR_TD_RLO:
|
|
case CHAR_TD_PDF:
|
|
return true;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
inline bool IsPrintable(char32_t c)
|
|
{
|
|
if (c < 0x20) return false;
|
|
if (c < 0xE000) return true;
|
|
if (c < 0xE200) return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Check whether UNICODE character is whitespace or not, i.e. whether
|
|
* this is a potential line-break character.
|
|
* @param c UNICODE character to check
|
|
* @return a boolean value whether 'c' is a whitespace character or not
|
|
* @see http://www.fileformat.info/info/unicode/category/Zs/list.htm
|
|
*/
|
|
inline bool IsWhitespace(char32_t c)
|
|
{
|
|
return c == 0x0020 /* SPACE */ || c == 0x3000; /* IDEOGRAPHIC SPACE */
|
|
}
|
|
|
|
/* Needed for NetBSD version (so feature) testing */
|
|
#if defined(__NetBSD__) || defined(__FreeBSD__)
|
|
#include <sys/param.h>
|
|
#endif
|
|
|
|
/* strcasestr is available for _GNU_SOURCE, BSD and some Apple */
|
|
#if defined(_GNU_SOURCE) || (defined(__BSD_VISIBLE) && __BSD_VISIBLE) || (defined(__APPLE__) && (!defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE))) || defined(_NETBSD_SOURCE)
|
|
# undef DEFINE_STRCASESTR
|
|
#else
|
|
# define DEFINE_STRCASESTR
|
|
char *strcasestr(const char *haystack, const char *needle);
|
|
#endif /* strcasestr is available */
|
|
|
|
#endif /* STRING_FUNC_H */
|