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Duckstation/dep/rapidyaml/include/c4/substr.hpp
Stenzek 5c08fa9d00
dep: Add rapidyaml
2024-02-04 16:14:05 +10:00

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#ifndef _C4_SUBSTR_HPP_
#define _C4_SUBSTR_HPP_
/** @file substr.hpp read+write string views */
#include <string.h>
#include <ctype.h>
#include <type_traits>
#include "c4/config.hpp"
#include "c4/error.hpp"
#include "c4/substr_fwd.hpp"
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wold-style-cast"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wtype-limits" // disable warnings on size_t>=0, used heavily in assertions below. These assertions are a preparation step for providing the index type as a template parameter.
# pragma GCC diagnostic ignored "-Wuseless-cast"
# pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
namespace c4 {
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
namespace detail {
template<typename C>
static inline void _do_reverse(C *C4_RESTRICT first, C *C4_RESTRICT last)
{
while(last > first)
{
C tmp = *last;
*last-- = *first;
*first++ = tmp;
}
}
} // namespace detail
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// utility macros to deuglify SFINAE code; undefined after the class.
// https://stackoverflow.com/questions/43051882/how-to-disable-a-class-member-funrtion-for-certain-template-types
#define C4_REQUIRE_RW(ret_type) \
template <typename U=C> \
typename std::enable_if< ! std::is_const<U>::value, ret_type>::type
/** a non-owning string-view, consisting of a character pointer
* and a length.
*
* @note The pointer is explicitly restricted.
*
* @see to_substr()
* @see to_csubstr()
*/
template<class C>
struct C4CORE_EXPORT basic_substring
{
public:
/** a restricted pointer to the first character of the substring */
C * C4_RESTRICT str;
/** the length of the substring */
size_t len;
public:
/** @name Types */
/** @{ */
using CC = typename std::add_const<C>::type; //!< CC=const char
using NCC_ = typename std::remove_const<C>::type; //!< NCC_=non const char
using ro_substr = basic_substring<CC>;
using rw_substr = basic_substring<NCC_>;
using char_type = C;
using size_type = size_t;
using iterator = C*;
using const_iterator = CC*;
enum : size_t { npos = (size_t)-1, NONE = (size_t)-1 };
/// convert automatically to substring of const C
template<class U=C>
C4_ALWAYS_INLINE operator typename std::enable_if<!std::is_const<U>::value, ro_substr const&>::type () const noexcept
{
return *(ro_substr const*)this; // don't call the str+len ctor because it does a check
}
/** @} */
public:
/** @name Default construction and assignment */
/** @{ */
C4_ALWAYS_INLINE constexpr basic_substring() noexcept : str(), len() {}
C4_ALWAYS_INLINE basic_substring(basic_substring const&) noexcept = default;
C4_ALWAYS_INLINE basic_substring(basic_substring &&) noexcept = default;
C4_ALWAYS_INLINE basic_substring(std::nullptr_t) noexcept : str(nullptr), len(0) {}
C4_ALWAYS_INLINE basic_substring& operator= (basic_substring const&) noexcept = default;
C4_ALWAYS_INLINE basic_substring& operator= (basic_substring &&) noexcept = default;
C4_ALWAYS_INLINE basic_substring& operator= (std::nullptr_t) noexcept { str = nullptr; len = 0; return *this; }
C4_ALWAYS_INLINE void clear() noexcept { str = nullptr; len = 0; }
/** @} */
public:
/** @name Construction and assignment from characters with the same type */
/** @{ */
/** Construct from an array.
* @warning the input string need not be zero terminated, but the
* length is taken as if the string was zero terminated */
template<size_t N>
C4_ALWAYS_INLINE constexpr basic_substring(C (&s_)[N]) noexcept : str(s_), len(N-1) {}
/** Construct from a pointer and length.
* @warning the input string need not be zero terminated. */
C4_ALWAYS_INLINE basic_substring(C *s_, size_t len_) noexcept : str(s_), len(len_) { C4_ASSERT(str || !len_); }
/** Construct from two pointers.
* @warning the end pointer MUST BE larger than or equal to the begin pointer
* @warning the input string need not be zero terminated */
C4_ALWAYS_INLINE basic_substring(C *beg_, C *end_) noexcept : str(beg_), len(static_cast<size_t>(end_ - beg_)) { C4_ASSERT(end_ >= beg_); }
/** Construct from a C-string (zero-terminated string)
* @warning the input string MUST BE zero terminated.
* @warning will call strlen()
* @note this overload uses SFINAE to prevent it from overriding the array ctor
* @see For a more detailed explanation on why the plain overloads cannot
* coexist, see http://cplusplus.bordoon.com/specializeForCharacterArrays.html */
template<class U, typename std::enable_if<std::is_same<U, C*>::value || std::is_same<U, NCC_*>::value, int>::type=0>
C4_ALWAYS_INLINE basic_substring(U s_) noexcept : str(s_), len(s_ ? strlen(s_) : 0) {}
/** Assign from an array.
* @warning the input string need not be zero terminated, but the
* length is taken as if the string was zero terminated */
template<size_t N>
C4_ALWAYS_INLINE void assign(C (&s_)[N]) noexcept { str = (s_); len = (N-1); }
/** Assign from a pointer and length.
* @warning the input string need not be zero terminated. */
C4_ALWAYS_INLINE void assign(C *s_, size_t len_) noexcept { str = s_; len = len_; C4_ASSERT(str || !len_); }
/** Assign from two pointers.
* @warning the end pointer MUST BE larger than or equal to the begin pointer
* @warning the input string need not be zero terminated. */
C4_ALWAYS_INLINE void assign(C *beg_, C *end_) noexcept { C4_ASSERT(end_ >= beg_); str = (beg_); len = static_cast<size_t>(end_ - beg_); }
/** Assign from a C-string (zero-terminated string)
* @warning the input string must be zero terminated.
* @warning will call strlen()
* @note this overload uses SFINAE to prevent it from overriding the array ctor
* @see For a more detailed explanation on why the plain overloads cannot
* coexist, see http://cplusplus.bordoon.com/specializeForCharacterArrays.html */
template<class U, typename std::enable_if<std::is_same<U, C*>::value || std::is_same<U, NCC_*>::value, int>::type=0>
C4_ALWAYS_INLINE void assign(U s_) noexcept { str = (s_); len = (s_ ? strlen(s_) : 0); }
/** Assign from an array.
* @warning the input string need not be zero terminated. */
template<size_t N>
C4_ALWAYS_INLINE basic_substring& operator= (C (&s_)[N]) noexcept { str = (s_); len = (N-1); return *this; }
/** Assign from a C-string (zero-terminated string)
* @warning the input string MUST BE zero terminated.
* @warning will call strlen()
* @note this overload uses SFINAE to prevent it from overriding the array ctor
* @see For a more detailed explanation on why the plain overloads cannot
* coexist, see http://cplusplus.bordoon.com/specializeForCharacterArrays.html */
template<class U, typename std::enable_if<std::is_same<U, C*>::value || std::is_same<U, NCC_*>::value, int>::type=0>
C4_ALWAYS_INLINE basic_substring& operator= (U s_) noexcept { str = s_; len = s_ ? strlen(s_) : 0; return *this; }
/** @} */
public:
/** @name Standard accessor methods */
/** @{ */
C4_ALWAYS_INLINE C4_PURE bool has_str() const noexcept { return ! empty() && str[0] != C(0); }
C4_ALWAYS_INLINE C4_PURE bool empty() const noexcept { return (len == 0 || str == nullptr); }
C4_ALWAYS_INLINE C4_PURE bool not_empty() const noexcept { return (len != 0 && str != nullptr); }
C4_ALWAYS_INLINE C4_PURE size_t size() const noexcept { return len; }
C4_ALWAYS_INLINE C4_PURE iterator begin() noexcept { return str; }
C4_ALWAYS_INLINE C4_PURE iterator end () noexcept { return str + len; }
C4_ALWAYS_INLINE C4_PURE const_iterator begin() const noexcept { return str; }
C4_ALWAYS_INLINE C4_PURE const_iterator end () const noexcept { return str + len; }
C4_ALWAYS_INLINE C4_PURE C * data() noexcept { return str; }
C4_ALWAYS_INLINE C4_PURE C const* data() const noexcept { return str; }
C4_ALWAYS_INLINE C4_PURE C & operator[] (size_t i) noexcept { C4_ASSERT(i >= 0 && i < len); return str[i]; }
C4_ALWAYS_INLINE C4_PURE C const& operator[] (size_t i) const noexcept { C4_ASSERT(i >= 0 && i < len); return str[i]; }
C4_ALWAYS_INLINE C4_PURE C & front() noexcept { C4_ASSERT(len > 0 && str != nullptr); return *str; }
C4_ALWAYS_INLINE C4_PURE C const& front() const noexcept { C4_ASSERT(len > 0 && str != nullptr); return *str; }
C4_ALWAYS_INLINE C4_PURE C & back() noexcept { C4_ASSERT(len > 0 && str != nullptr); return *(str + len - 1); }
C4_ALWAYS_INLINE C4_PURE C const& back() const noexcept { C4_ASSERT(len > 0 && str != nullptr); return *(str + len - 1); }
/** @} */
public:
/** @name Comparison methods */
/** @{ */
C4_PURE int compare(C const c) const noexcept
{
C4_XASSERT((str != nullptr) || len == 0);
if(C4_LIKELY(str != nullptr && len > 0))
return (*str != c) ? *str - c : (static_cast<int>(len) - 1);
else
return -1;
}
C4_PURE int compare(const char *C4_RESTRICT that, size_t sz) const noexcept
{
C4_XASSERT(that || sz == 0);
C4_XASSERT(str || len == 0);
if(C4_LIKELY(str && that))
{
{
const size_t min = len < sz ? len : sz;
for(size_t i = 0; i < min; ++i)
if(str[i] != that[i])
return str[i] < that[i] ? -1 : 1;
}
if(len < sz)
return -1;
else if(len == sz)
return 0;
else
return 1;
}
else if(len == sz)
{
C4_XASSERT(len == 0 && sz == 0);
return 0;
}
return len < sz ? -1 : 1;
}
C4_ALWAYS_INLINE C4_PURE int compare(ro_substr const that) const noexcept { return this->compare(that.str, that.len); }
C4_ALWAYS_INLINE C4_PURE bool operator== (std::nullptr_t) const noexcept { return str == nullptr; }
C4_ALWAYS_INLINE C4_PURE bool operator!= (std::nullptr_t) const noexcept { return str != nullptr; }
C4_ALWAYS_INLINE C4_PURE bool operator== (C const c) const noexcept { return this->compare(c) == 0; }
C4_ALWAYS_INLINE C4_PURE bool operator!= (C const c) const noexcept { return this->compare(c) != 0; }
C4_ALWAYS_INLINE C4_PURE bool operator< (C const c) const noexcept { return this->compare(c) < 0; }
C4_ALWAYS_INLINE C4_PURE bool operator> (C const c) const noexcept { return this->compare(c) > 0; }
C4_ALWAYS_INLINE C4_PURE bool operator<= (C const c) const noexcept { return this->compare(c) <= 0; }
C4_ALWAYS_INLINE C4_PURE bool operator>= (C const c) const noexcept { return this->compare(c) >= 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator== (basic_substring<U> const that) const noexcept { return this->compare(that) == 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator!= (basic_substring<U> const that) const noexcept { return this->compare(that) != 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator< (basic_substring<U> const that) const noexcept { return this->compare(that) < 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator> (basic_substring<U> const that) const noexcept { return this->compare(that) > 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator<= (basic_substring<U> const that) const noexcept { return this->compare(that) <= 0; }
template<class U> C4_ALWAYS_INLINE C4_PURE bool operator>= (basic_substring<U> const that) const noexcept { return this->compare(that) >= 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator== (const char (&that)[N]) const noexcept { return this->compare(that, N-1) == 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator!= (const char (&that)[N]) const noexcept { return this->compare(that, N-1) != 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator< (const char (&that)[N]) const noexcept { return this->compare(that, N-1) < 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator> (const char (&that)[N]) const noexcept { return this->compare(that, N-1) > 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator<= (const char (&that)[N]) const noexcept { return this->compare(that, N-1) <= 0; }
template<size_t N> C4_ALWAYS_INLINE C4_PURE bool operator>= (const char (&that)[N]) const noexcept { return this->compare(that, N-1) >= 0; }
/** @} */
public:
/** @name Sub-selection methods */
/** @{ */
/** true if *this is a substring of that (ie, from the same buffer) */
C4_ALWAYS_INLINE C4_PURE bool is_sub(ro_substr const that) const noexcept
{
return that.is_super(*this);
}
/** true if that is a substring of *this (ie, from the same buffer) */
C4_ALWAYS_INLINE C4_PURE bool is_super(ro_substr const that) const noexcept
{
if(C4_LIKELY(len > 0))
return that.str >= str && that.str+that.len <= str+len;
else
return that.len == 0 && that.str == str && str != nullptr;
}
/** true if there is overlap of at least one element between that and *this */
C4_ALWAYS_INLINE C4_PURE bool overlaps(ro_substr const that) const noexcept
{
// thanks @timwynants
return that.str+that.len > str && that.str < str+len;
}
public:
/** return [first,len[ */
C4_ALWAYS_INLINE C4_PURE basic_substring sub(size_t first) const noexcept
{
C4_ASSERT(first >= 0 && first <= len);
return basic_substring(str + first, len - first);
}
/** return [first,first+num[. If num==npos, return [first,len[ */
C4_ALWAYS_INLINE C4_PURE basic_substring sub(size_t first, size_t num) const noexcept
{
C4_ASSERT(first >= 0 && first <= len);
C4_ASSERT((num >= 0 && num <= len) || (num == npos));
size_t rnum = num != npos ? num : len - first;
C4_ASSERT((first >= 0 && first + rnum <= len) || (num == 0));
return basic_substring(str + first, rnum);
}
/** return [first,last[. If last==npos, return [first,len[ */
C4_ALWAYS_INLINE C4_PURE basic_substring range(size_t first, size_t last=npos) const noexcept
{
C4_ASSERT(first >= 0 && first <= len);
last = last != npos ? last : len;
C4_ASSERT(first <= last);
C4_ASSERT(last >= 0 && last <= len);
return basic_substring(str + first, last - first);
}
/** return the first @p num elements: [0,num[*/
C4_ALWAYS_INLINE C4_PURE basic_substring first(size_t num) const noexcept
{
C4_ASSERT(num <= len || num == npos);
return basic_substring(str, num != npos ? num : len);
}
/** return the last @num elements: [len-num,len[*/
C4_ALWAYS_INLINE C4_PURE basic_substring last(size_t num) const noexcept
{
C4_ASSERT(num <= len || num == npos);
return num != npos ?
basic_substring(str + len - num, num) :
*this;
}
/** offset from the ends: return [left,len-right[ ; ie, trim a
number of characters from the left and right. This is
equivalent to python's negative list indices. */
C4_ALWAYS_INLINE C4_PURE basic_substring offs(size_t left, size_t right) const noexcept
{
C4_ASSERT(left >= 0 && left <= len);
C4_ASSERT(right >= 0 && right <= len);
C4_ASSERT(left <= len - right + 1);
return basic_substring(str + left, len - right - left);
}
/** return [0, pos[ . Same as .first(pos), but provided for compatibility with .right_of() */
C4_ALWAYS_INLINE C4_PURE basic_substring left_of(size_t pos) const noexcept
{
C4_ASSERT(pos <= len || pos == npos);
return (pos != npos) ?
basic_substring(str, pos) :
*this;
}
/** return [0, pos+include_pos[ . Same as .first(pos+1), but provided for compatibility with .right_of() */
C4_ALWAYS_INLINE C4_PURE basic_substring left_of(size_t pos, bool include_pos) const noexcept
{
C4_ASSERT(pos <= len || pos == npos);
return (pos != npos) ?
basic_substring(str, pos+include_pos) :
*this;
}
/** return [pos+1, len[ */
C4_ALWAYS_INLINE C4_PURE basic_substring right_of(size_t pos) const noexcept
{
C4_ASSERT(pos <= len || pos == npos);
return (pos != npos) ?
basic_substring(str + (pos + 1), len - (pos + 1)) :
basic_substring(str + len, size_t(0));
}
/** return [pos+!include_pos, len[ */
C4_ALWAYS_INLINE C4_PURE basic_substring right_of(size_t pos, bool include_pos) const noexcept
{
C4_ASSERT(pos <= len || pos == npos);
return (pos != npos) ?
basic_substring(str + (pos + !include_pos), len - (pos + !include_pos)) :
basic_substring(str + len, size_t(0));
}
public:
/** given @p subs a substring of the current string, get the
* portion of the current string to the left of it */
C4_ALWAYS_INLINE C4_PURE basic_substring left_of(ro_substr const subs) const noexcept
{
C4_ASSERT(is_super(subs) || subs.empty());
auto ssb = subs.begin();
auto b = begin();
auto e = end();
if(ssb >= b && ssb <= e)
return sub(0, static_cast<size_t>(ssb - b));
else
return sub(0, 0);
}
/** given @p subs a substring of the current string, get the
* portion of the current string to the right of it */
C4_ALWAYS_INLINE C4_PURE basic_substring right_of(ro_substr const subs) const noexcept
{
C4_ASSERT(is_super(subs) || subs.empty());
auto sse = subs.end();
auto b = begin();
auto e = end();
if(sse >= b && sse <= e)
return sub(static_cast<size_t>(sse - b), static_cast<size_t>(e - sse));
else
return sub(0, 0);
}
/** @} */
public:
/** @name Removing characters (trim()) / patterns (strip()) from the tips of the string */
/** @{ */
/** trim left */
basic_substring triml(const C c) const
{
if( ! empty())
{
size_t pos = first_not_of(c);
if(pos != npos)
return sub(pos);
}
return sub(0, 0);
}
/** trim left ANY of the characters.
* @see stripl() to remove a pattern from the left */
basic_substring triml(ro_substr chars) const
{
if( ! empty())
{
size_t pos = first_not_of(chars);
if(pos != npos)
return sub(pos);
}
return sub(0, 0);
}
/** trim the character c from the right */
basic_substring trimr(const C c) const
{
if( ! empty())
{
size_t pos = last_not_of(c, npos);
if(pos != npos)
return sub(0, pos+1);
}
return sub(0, 0);
}
/** trim right ANY of the characters
* @see stripr() to remove a pattern from the right */
basic_substring trimr(ro_substr chars) const
{
if( ! empty())
{
size_t pos = last_not_of(chars, npos);
if(pos != npos)
return sub(0, pos+1);
}
return sub(0, 0);
}
/** trim the character c left and right */
basic_substring trim(const C c) const
{
return triml(c).trimr(c);
}
/** trim left and right ANY of the characters
* @see strip() to remove a pattern from the left and right */
basic_substring trim(ro_substr const chars) const
{
return triml(chars).trimr(chars);
}
/** remove a pattern from the left
* @see triml() to remove characters*/
basic_substring stripl(ro_substr pattern) const
{
if( ! begins_with(pattern))
return *this;
return sub(pattern.len < len ? pattern.len : len);
}
/** remove a pattern from the right
* @see trimr() to remove characters*/
basic_substring stripr(ro_substr pattern) const
{
if( ! ends_with(pattern))
return *this;
return left_of(len - (pattern.len < len ? pattern.len : len));
}
/** @} */
public:
/** @name Lookup methods */
/** @{ */
inline size_t find(const C c, size_t start_pos=0) const
{
return first_of(c, start_pos);
}
inline size_t find(ro_substr pattern, size_t start_pos=0) const
{
C4_ASSERT(start_pos == npos || (start_pos >= 0 && start_pos <= len));
if(len < pattern.len) return npos;
for(size_t i = start_pos, e = len - pattern.len + 1; i < e; ++i)
{
bool gotit = true;
for(size_t j = 0; j < pattern.len; ++j)
{
C4_ASSERT(i + j < len);
if(str[i + j] != pattern.str[j])
{
gotit = false;
break;
}
}
if(gotit)
{
return i;
}
}
return npos;
}
public:
/** count the number of occurrences of c */
inline size_t count(const C c, size_t pos=0) const
{
C4_ASSERT(pos >= 0 && pos <= len);
size_t num = 0;
pos = find(c, pos);
while(pos != npos)
{
++num;
pos = find(c, pos + 1);
}
return num;
}
/** count the number of occurrences of s */
inline size_t count(ro_substr c, size_t pos=0) const
{
C4_ASSERT(pos >= 0 && pos <= len);
size_t num = 0;
pos = find(c, pos);
while(pos != npos)
{
++num;
pos = find(c, pos + c.len);
}
return num;
}
/** get the substr consisting of the first occurrence of @p c after @p pos, or an empty substr if none occurs */
inline basic_substring select(const C c, size_t pos=0) const
{
pos = find(c, pos);
return pos != npos ? sub(pos, 1) : basic_substring();
}
/** get the substr consisting of the first occurrence of @p pattern after @p pos, or an empty substr if none occurs */
inline basic_substring select(ro_substr pattern, size_t pos=0) const
{
pos = find(pattern, pos);
return pos != npos ? sub(pos, pattern.len) : basic_substring();
}
public:
struct first_of_any_result
{
size_t which;
size_t pos;
inline operator bool() const { return which != NONE && pos != npos; }
};
first_of_any_result first_of_any(ro_substr s0, ro_substr s1) const
{
ro_substr s[2] = {s0, s1};
return first_of_any_iter(&s[0], &s[0] + 2);
}
first_of_any_result first_of_any(ro_substr s0, ro_substr s1, ro_substr s2) const
{
ro_substr s[3] = {s0, s1, s2};
return first_of_any_iter(&s[0], &s[0] + 3);
}
first_of_any_result first_of_any(ro_substr s0, ro_substr s1, ro_substr s2, ro_substr s3) const
{
ro_substr s[4] = {s0, s1, s2, s3};
return first_of_any_iter(&s[0], &s[0] + 4);
}
first_of_any_result first_of_any(ro_substr s0, ro_substr s1, ro_substr s2, ro_substr s3, ro_substr s4) const
{
ro_substr s[5] = {s0, s1, s2, s3, s4};
return first_of_any_iter(&s[0], &s[0] + 5);
}
template<class It>
first_of_any_result first_of_any_iter(It first_span, It last_span) const
{
for(size_t i = 0; i < len; ++i)
{
size_t curr = 0;
for(It it = first_span; it != last_span; ++curr, ++it)
{
auto const& chars = *it;
if((i + chars.len) > len) continue;
bool gotit = true;
for(size_t j = 0; j < chars.len; ++j)
{
C4_ASSERT(i + j < len);
if(str[i + j] != chars[j])
{
gotit = false;
break;
}
}
if(gotit)
{
return {curr, i};
}
}
}
return {NONE, npos};
}
public:
/** true if the first character of the string is @p c */
bool begins_with(const C c) const
{
return len > 0 ? str[0] == c : false;
}
/** true if the first @p num characters of the string are @p c */
bool begins_with(const C c, size_t num) const
{
if(len < num)
{
return false;
}
for(size_t i = 0; i < num; ++i)
{
if(str[i] != c)
{
return false;
}
}
return true;
}
/** true if the string begins with the given @p pattern */
bool begins_with(ro_substr pattern) const
{
if(len < pattern.len)
{
return false;
}
for(size_t i = 0; i < pattern.len; ++i)
{
if(str[i] != pattern[i])
{
return false;
}
}
return true;
}
/** true if the first character of the string is any of the given @p chars */
bool begins_with_any(ro_substr chars) const
{
if(len == 0)
{
return false;
}
for(size_t i = 0; i < chars.len; ++i)
{
if(str[0] == chars.str[i])
{
return true;
}
}
return false;
}
/** true if the last character of the string is @p c */
bool ends_with(const C c) const
{
return len > 0 ? str[len-1] == c : false;
}
/** true if the last @p num characters of the string are @p c */
bool ends_with(const C c, size_t num) const
{
if(len < num)
{
return false;
}
for(size_t i = len - num; i < len; ++i)
{
if(str[i] != c)
{
return false;
}
}
return true;
}
/** true if the string ends with the given @p pattern */
bool ends_with(ro_substr pattern) const
{
if(len < pattern.len)
{
return false;
}
for(size_t i = 0, s = len-pattern.len; i < pattern.len; ++i)
{
if(str[s+i] != pattern[i])
{
return false;
}
}
return true;
}
/** true if the last character of the string is any of the given @p chars */
bool ends_with_any(ro_substr chars) const
{
if(len == 0)
{
return false;
}
for(size_t i = 0; i < chars.len; ++i)
{
if(str[len - 1] == chars[i])
{
return true;
}
}
return false;
}
public:
/** @return the first position where c is found in the string, or npos if none is found */
size_t first_of(const C c, size_t start=0) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
for(size_t i = start; i < len; ++i)
{
if(str[i] == c)
return i;
}
return npos;
}
/** @return the last position where c is found in the string, or npos if none is found */
size_t last_of(const C c, size_t start=npos) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
if(start == npos)
start = len;
for(size_t i = start-1; i != size_t(-1); --i)
{
if(str[i] == c)
return i;
}
return npos;
}
/** @return the first position where ANY of the chars is found in the string, or npos if none is found */
size_t first_of(ro_substr chars, size_t start=0) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
for(size_t i = start; i < len; ++i)
{
for(size_t j = 0; j < chars.len; ++j)
{
if(str[i] == chars[j])
return i;
}
}
return npos;
}
/** @return the last position where ANY of the chars is found in the string, or npos if none is found */
size_t last_of(ro_substr chars, size_t start=npos) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
if(start == npos)
start = len;
for(size_t i = start-1; i != size_t(-1); --i)
{
for(size_t j = 0; j < chars.len; ++j)
{
if(str[i] == chars[j])
return i;
}
}
return npos;
}
public:
size_t first_not_of(const C c, size_t start=0) const
{
C4_ASSERT((start >= 0 && start <= len) || (start == len && len == 0));
for(size_t i = start; i < len; ++i)
{
if(str[i] != c)
return i;
}
return npos;
}
size_t last_not_of(const C c, size_t start=npos) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
if(start == npos)
start = len;
for(size_t i = start-1; i != size_t(-1); --i)
{
if(str[i] != c)
return i;
}
return npos;
}
size_t first_not_of(ro_substr chars, size_t start=0) const
{
C4_ASSERT((start >= 0 && start <= len) || (start == len && len == 0));
for(size_t i = start; i < len; ++i)
{
bool gotit = true;
for(size_t j = 0; j < chars.len; ++j)
{
if(str[i] == chars.str[j])
{
gotit = false;
break;
}
}
if(gotit)
{
return i;
}
}
return npos;
}
size_t last_not_of(ro_substr chars, size_t start=npos) const
{
C4_ASSERT(start == npos || (start >= 0 && start <= len));
if(start == npos)
start = len;
for(size_t i = start-1; i != size_t(-1); --i)
{
bool gotit = true;
for(size_t j = 0; j < chars.len; ++j)
{
if(str[i] == chars.str[j])
{
gotit = false;
break;
}
}
if(gotit)
{
return i;
}
}
return npos;
}
/** @} */
public:
/** @name Range lookup methods */
/** @{ */
/** get the range delimited by an open-close pair of characters.
* @note There must be no nested pairs.
* @note No checks for escapes are performed. */
basic_substring pair_range(CC open, CC close) const
{
size_t b = find(open);
if(b == npos)
return basic_substring();
size_t e = find(close, b+1);
if(e == npos)
return basic_substring();
basic_substring ret = range(b, e+1);
C4_ASSERT(ret.sub(1).find(open) == npos);
return ret;
}
/** get the range delimited by a single open-close character (eg, quotes).
* @note The open-close character can be escaped. */
basic_substring pair_range_esc(CC open_close, CC escape=CC('\\'))
{
size_t b = find(open_close);
if(b == npos) return basic_substring();
for(size_t i = b+1; i < len; ++i)
{
CC c = str[i];
if(c == open_close)
{
if(str[i-1] != escape)
{
return range(b, i+1);
}
}
}
return basic_substring();
}
/** get the range delimited by an open-close pair of characters,
* with possibly nested occurrences. No checks for escapes are
* performed. */
basic_substring pair_range_nested(CC open, CC close) const
{
size_t b = find(open);
if(b == npos) return basic_substring();
size_t e, curr = b+1, count = 0;
const char both[] = {open, close, '\0'};
while((e = first_of(both, curr)) != npos)
{
if(str[e] == open)
{
++count;
curr = e+1;
}
else if(str[e] == close)
{
if(count == 0) return range(b, e+1);
--count;
curr = e+1;
}
}
return basic_substring();
}
basic_substring unquoted() const
{
constexpr const C dq('"'), sq('\'');
if(len >= 2 && (str[len - 2] != C('\\')) &&
((begins_with(sq) && ends_with(sq))
||
(begins_with(dq) && ends_with(dq))))
{
return range(1, len -1);
}
return *this;
}
/** @} */
public:
/** @name Number-matching query methods */
/** @{ */
/** @return true if the substring contents are a floating-point or integer number.
* @note any leading or trailing whitespace will return false. */
bool is_number() const
{
if(empty() || (first_non_empty_span().empty()))
return false;
if(first_uint_span() == *this)
return true;
if(first_int_span() == *this)
return true;
if(first_real_span() == *this)
return true;
return false;
}
/** @return true if the substring contents are a real number.
* @note any leading or trailing whitespace will return false. */
bool is_real() const
{
if(empty() || (first_non_empty_span().empty()))
return false;
if(first_real_span() == *this)
return true;
return false;
}
/** @return true if the substring contents are an integer number.
* @note any leading or trailing whitespace will return false. */
bool is_integer() const
{
if(empty() || (first_non_empty_span().empty()))
return false;
if(first_uint_span() == *this)
return true;
if(first_int_span() == *this)
return true;
return false;
}
/** @return true if the substring contents are an unsigned integer number.
* @note any leading or trailing whitespace will return false. */
bool is_unsigned_integer() const
{
if(empty() || (first_non_empty_span().empty()))
return false;
if(first_uint_span() == *this)
return true;
return false;
}
/** get the first span consisting exclusively of non-empty characters */
basic_substring first_non_empty_span() const
{
constexpr const ro_substr empty_chars(" \n\r\t");
size_t pos = first_not_of(empty_chars);
if(pos == npos)
return first(0);
auto ret = sub(pos);
pos = ret.first_of(empty_chars);
return ret.first(pos);
}
/** get the first span which can be interpreted as an unsigned integer */
basic_substring first_uint_span() const
{
basic_substring ne = first_non_empty_span();
if(ne.empty())
return ne;
if(ne.str[0] == '-')
return first(0);
size_t skip_start = size_t(ne.str[0] == '+');
return ne._first_integral_span(skip_start);
}
/** get the first span which can be interpreted as a signed integer */
basic_substring first_int_span() const
{
basic_substring ne = first_non_empty_span();
if(ne.empty())
return ne;
size_t skip_start = size_t(ne.str[0] == '+' || ne.str[0] == '-');
return ne._first_integral_span(skip_start);
}
basic_substring _first_integral_span(size_t skip_start) const
{
C4_ASSERT(!empty());
if(skip_start == len)
return first(0);
C4_ASSERT(skip_start < len);
if(len >= skip_start + 3)
{
if(str[skip_start] != '0')
{
for(size_t i = skip_start; i < len; ++i)
{
char c = str[i];
if(c < '0' || c > '9')
return i > skip_start && _is_delim_char(c) ? first(i) : first(0);
}
}
else
{
char next = str[skip_start + 1];
if(next == 'x' || next == 'X')
{
skip_start += 2;
for(size_t i = skip_start; i < len; ++i)
{
const char c = str[i];
if( ! _is_hex_char(c))
return i > skip_start && _is_delim_char(c) ? first(i) : first(0);
}
return *this;
}
else if(next == 'b' || next == 'B')
{
skip_start += 2;
for(size_t i = skip_start; i < len; ++i)
{
const char c = str[i];
if(c != '0' && c != '1')
return i > skip_start && _is_delim_char(c) ? first(i) : first(0);
}
return *this;
}
else if(next == 'o' || next == 'O')
{
skip_start += 2;
for(size_t i = skip_start; i < len; ++i)
{
const char c = str[i];
if(c < '0' || c > '7')
return i > skip_start && _is_delim_char(c) ? first(i) : first(0);
}
return *this;
}
}
}
// must be a decimal, or it is not a an number
for(size_t i = skip_start; i < len; ++i)
{
const char c = str[i];
if(c < '0' || c > '9')
return i > skip_start && _is_delim_char(c) ? first(i) : first(0);
}
return *this;
}
/** get the first span which can be interpreted as a real (floating-point) number */
basic_substring first_real_span() const
{
basic_substring ne = first_non_empty_span();
if(ne.empty())
return ne;
size_t skip_start = (ne.str[0] == '+' || ne.str[0] == '-');
C4_ASSERT(skip_start == 0 || skip_start == 1);
// if we have at least three digits after the leading sign, it
// can be decimal, or hex, or bin or oct. Ex:
// non-decimal: 0x0, 0b0, 0o0
// decimal: 1.0, 10., 1e1, 100, inf, nan, infinity
if(ne.len >= skip_start+3)
{
// if it does not have leading 0, it must be decimal, or it is not a real
if(ne.str[skip_start] != '0')
{
if(ne.str[skip_start] == 'i') // is it infinity or inf?
{
basic_substring word = ne._word_follows(skip_start + 1, "nfinity");
if(word.len)
return word;
return ne._word_follows(skip_start + 1, "nf");
}
else if(ne.str[skip_start] == 'n') // is it nan?
{
return ne._word_follows(skip_start + 1, "an");
}
else // must be a decimal, or it is not a real
{
return ne._first_real_span_dec(skip_start);
}
}
else // starts with 0. is it 0x, 0b or 0o?
{
const char next = ne.str[skip_start + 1];
// hexadecimal
if(next == 'x' || next == 'X')
return ne._first_real_span_hex(skip_start + 2);
// binary
else if(next == 'b' || next == 'B')
return ne._first_real_span_bin(skip_start + 2);
// octal
else if(next == 'o' || next == 'O')
return ne._first_real_span_oct(skip_start + 2);
// none of the above. may still be a decimal.
else
return ne._first_real_span_dec(skip_start); // do not skip the 0.
}
}
// less than 3 chars after the leading sign. It is either a
// decimal or it is not a real. (cannot be any of 0x0, etc).
return ne._first_real_span_dec(skip_start);
}
/** true if the character is a delimiter character *at the end* */
static constexpr C4_ALWAYS_INLINE C4_CONST bool _is_delim_char(char c) noexcept
{
return c == ' ' || c == '\n'
|| c == ']' || c == ')' || c == '}'
|| c == ',' || c == ';' || c == '\r' || c == '\t' || c == '\0';
}
/** true if the character is in [0-9a-fA-F] */
static constexpr C4_ALWAYS_INLINE C4_CONST bool _is_hex_char(char c) noexcept
{
return (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f') || (c >= 'A' && c <= 'F');
}
C4_NO_INLINE C4_PURE basic_substring _word_follows(size_t pos, csubstr word) const noexcept
{
size_t posend = pos + word.len;
if(len >= posend && sub(pos, word.len) == word)
if(len == posend || _is_delim_char(str[posend]))
return first(posend);
return first(0);
}
// this function is declared inside the class to avoid a VS error with __declspec(dllimport)
C4_NO_INLINE C4_PURE basic_substring _first_real_span_dec(size_t pos) const noexcept
{
bool intchars = false;
bool fracchars = false;
bool powchars;
// integral part
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
{
intchars = true;
}
else if(c == '.')
{
++pos;
goto fractional_part_dec;
}
else if(c == 'e' || c == 'E')
{
++pos;
goto power_part_dec;
}
else if(_is_delim_char(c))
{
return intchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
// no . or p were found; this is either an integral number
// or not a number at all
return intchars ?
*this :
first(0);
fractional_part_dec:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == '.');
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
{
fracchars = true;
}
else if(c == 'e' || c == 'E')
{
++pos;
goto power_part_dec;
}
else if(_is_delim_char(c))
{
return intchars || fracchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
return intchars || fracchars ?
*this :
first(0);
power_part_dec:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == 'e' || str[pos - 1] == 'E');
// either a + or a - is expected here, followed by more chars.
// also, using (pos+1) in this check will cause an early
// return when no more chars follow the sign.
if(len <= (pos+1) || ((!intchars) && (!fracchars)))
return first(0);
++pos; // this was the sign.
// ... so the (pos+1) ensures that we enter the loop and
// hence that there exist chars in the power part
powchars = false;
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
powchars = true;
else if(powchars && _is_delim_char(c))
return first(pos);
else
return first(0);
}
return *this;
}
// this function is declared inside the class to avoid a VS error with __declspec(dllimport)
C4_NO_INLINE C4_PURE basic_substring _first_real_span_hex(size_t pos) const noexcept
{
bool intchars = false;
bool fracchars = false;
bool powchars;
// integral part
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(_is_hex_char(c))
{
intchars = true;
}
else if(c == '.')
{
++pos;
goto fractional_part_hex;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_hex;
}
else if(_is_delim_char(c))
{
return intchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
// no . or p were found; this is either an integral number
// or not a number at all
return intchars ?
*this :
first(0);
fractional_part_hex:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == '.');
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(_is_hex_char(c))
{
fracchars = true;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_hex;
}
else if(_is_delim_char(c))
{
return intchars || fracchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
return intchars || fracchars ?
*this :
first(0);
power_part_hex:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == 'p' || str[pos - 1] == 'P');
// either a + or a - is expected here, followed by more chars.
// also, using (pos+1) in this check will cause an early
// return when no more chars follow the sign.
if(len <= (pos+1) || (str[pos] != '+' && str[pos] != '-') || ((!intchars) && (!fracchars)))
return first(0);
++pos; // this was the sign.
// ... so the (pos+1) ensures that we enter the loop and
// hence that there exist chars in the power part
powchars = false;
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
powchars = true;
else if(powchars && _is_delim_char(c))
return first(pos);
else
return first(0);
}
return *this;
}
// this function is declared inside the class to avoid a VS error with __declspec(dllimport)
C4_NO_INLINE C4_PURE basic_substring _first_real_span_bin(size_t pos) const noexcept
{
bool intchars = false;
bool fracchars = false;
bool powchars;
// integral part
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c == '0' || c == '1')
{
intchars = true;
}
else if(c == '.')
{
++pos;
goto fractional_part_bin;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_bin;
}
else if(_is_delim_char(c))
{
return intchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
// no . or p were found; this is either an integral number
// or not a number at all
return intchars ?
*this :
first(0);
fractional_part_bin:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == '.');
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c == '0' || c == '1')
{
fracchars = true;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_bin;
}
else if(_is_delim_char(c))
{
return intchars || fracchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
return intchars || fracchars ?
*this :
first(0);
power_part_bin:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == 'p' || str[pos - 1] == 'P');
// either a + or a - is expected here, followed by more chars.
// also, using (pos+1) in this check will cause an early
// return when no more chars follow the sign.
if(len <= (pos+1) || (str[pos] != '+' && str[pos] != '-') || ((!intchars) && (!fracchars)))
return first(0);
++pos; // this was the sign.
// ... so the (pos+1) ensures that we enter the loop and
// hence that there exist chars in the power part
powchars = false;
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
powchars = true;
else if(powchars && _is_delim_char(c))
return first(pos);
else
return first(0);
}
return *this;
}
// this function is declared inside the class to avoid a VS error with __declspec(dllimport)
C4_NO_INLINE C4_PURE basic_substring _first_real_span_oct(size_t pos) const noexcept
{
bool intchars = false;
bool fracchars = false;
bool powchars;
// integral part
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '7')
{
intchars = true;
}
else if(c == '.')
{
++pos;
goto fractional_part_oct;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_oct;
}
else if(_is_delim_char(c))
{
return intchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
// no . or p were found; this is either an integral number
// or not a number at all
return intchars ?
*this :
first(0);
fractional_part_oct:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == '.');
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '7')
{
fracchars = true;
}
else if(c == 'p' || c == 'P')
{
++pos;
goto power_part_oct;
}
else if(_is_delim_char(c))
{
return intchars || fracchars ? first(pos) : first(0);
}
else
{
return first(0);
}
}
return intchars || fracchars ?
*this :
first(0);
power_part_oct:
C4_ASSERT(pos > 0);
C4_ASSERT(str[pos - 1] == 'p' || str[pos - 1] == 'P');
// either a + or a - is expected here, followed by more chars.
// also, using (pos+1) in this check will cause an early
// return when no more chars follow the sign.
if(len <= (pos+1) || (str[pos] != '+' && str[pos] != '-') || ((!intchars) && (!fracchars)))
return first(0);
++pos; // this was the sign.
// ... so the (pos+1) ensures that we enter the loop and
// hence that there exist chars in the power part
powchars = false;
for( ; pos < len; ++pos)
{
const char c = str[pos];
if(c >= '0' && c <= '9')
powchars = true;
else if(powchars && _is_delim_char(c))
return first(pos);
else
return first(0);
}
return *this;
}
/** @} */
public:
/** @name Splitting methods */
/** @{ */
/** returns true if the string has not been exhausted yet, meaning
* it's ok to call next_split() again. When no instance of sep
* exists in the string, returns the full string. When the input
* is an empty string, the output string is the empty string. */
bool next_split(C sep, size_t *C4_RESTRICT start_pos, basic_substring *C4_RESTRICT out) const
{
if(C4_LIKELY(*start_pos < len))
{
for(size_t i = *start_pos; i < len; i++)
{
if(str[i] == sep)
{
out->assign(str + *start_pos, i - *start_pos);
*start_pos = i+1;
return true;
}
}
out->assign(str + *start_pos, len - *start_pos);
*start_pos = len + 1;
return true;
}
else
{
bool valid = len > 0 && (*start_pos == len);
if(valid && str && str[len-1] == sep)
{
out->assign(str + len, size_t(0)); // the cast is needed to prevent overload ambiguity
}
else
{
out->assign(str + len + 1, size_t(0)); // the cast is needed to prevent overload ambiguity
}
*start_pos = len + 1;
return valid;
}
}
private:
struct split_proxy_impl
{
struct split_iterator_impl
{
split_proxy_impl const* m_proxy;
basic_substring m_str;
size_t m_pos;
NCC_ m_sep;
split_iterator_impl(split_proxy_impl const* proxy, size_t pos, C sep)
: m_proxy(proxy), m_pos(pos), m_sep(sep)
{
_tick();
}
void _tick()
{
m_proxy->m_str.next_split(m_sep, &m_pos, &m_str);
}
split_iterator_impl& operator++ () { _tick(); return *this; }
split_iterator_impl operator++ (int) { split_iterator_impl it = *this; _tick(); return it; }
basic_substring& operator* () { return m_str; }
basic_substring* operator-> () { return &m_str; }
bool operator!= (split_iterator_impl const& that) const
{
return !(this->operator==(that));
}
bool operator== (split_iterator_impl const& that) const
{
C4_XASSERT((m_sep == that.m_sep) && "cannot compare split iterators with different separators");
if(m_str.size() != that.m_str.size())
return false;
if(m_str.data() != that.m_str.data())
return false;
return m_pos == that.m_pos;
}
};
basic_substring m_str;
size_t m_start_pos;
C m_sep;
split_proxy_impl(basic_substring str_, size_t start_pos, C sep)
: m_str(str_), m_start_pos(start_pos), m_sep(sep)
{
}
split_iterator_impl begin() const
{
auto it = split_iterator_impl(this, m_start_pos, m_sep);
return it;
}
split_iterator_impl end() const
{
size_t pos = m_str.size() + 1;
auto it = split_iterator_impl(this, pos, m_sep);
return it;
}
};
public:
using split_proxy = split_proxy_impl;
/** a view into the splits */
split_proxy split(C sep, size_t start_pos=0) const
{
C4_XASSERT((start_pos >= 0 && start_pos < len) || empty());
auto ss = sub(0, len);
auto it = split_proxy(ss, start_pos, sep);
return it;
}
public:
/** pop right: return the first split from the right. Use
* gpop_left() to get the reciprocal part.
*/
basic_substring pop_right(C sep=C('/'), bool skip_empty=false) const
{
if(C4_LIKELY(len > 1))
{
auto pos = last_of(sep);
if(pos != npos)
{
if(pos + 1 < len) // does not end with sep
{
return sub(pos + 1); // return from sep to end
}
else // the string ends with sep
{
if( ! skip_empty)
{
return sub(pos + 1, 0);
}
auto ppos = last_not_of(sep); // skip repeated seps
if(ppos == npos) // the string is all made of seps
{
return sub(0, 0);
}
// find the previous sep
auto pos0 = last_of(sep, ppos);
if(pos0 == npos) // only the last sep exists
{
return sub(0); // return the full string (because skip_empty is true)
}
++pos0;
return sub(pos0);
}
}
else // no sep was found, return the full string
{
return *this;
}
}
else if(len == 1)
{
if(begins_with(sep))
{
return sub(0, 0);
}
return *this;
}
else // an empty string
{
return basic_substring();
}
}
/** return the first split from the left. Use gpop_right() to get
* the reciprocal part. */
basic_substring pop_left(C sep = C('/'), bool skip_empty=false) const
{
if(C4_LIKELY(len > 1))
{
auto pos = first_of(sep);
if(pos != npos)
{
if(pos > 0) // does not start with sep
{
return sub(0, pos); // return everything up to it
}
else // the string starts with sep
{
if( ! skip_empty)
{
return sub(0, 0);
}
auto ppos = first_not_of(sep); // skip repeated seps
if(ppos == npos) // the string is all made of seps
{
return sub(0, 0);
}
// find the next sep
auto pos0 = first_of(sep, ppos);
if(pos0 == npos) // only the first sep exists
{
return sub(0); // return the full string (because skip_empty is true)
}
C4_XASSERT(pos0 > 0);
// return everything up to the second sep
return sub(0, pos0);
}
}
else // no sep was found, return the full string
{
return sub(0);
}
}
else if(len == 1)
{
if(begins_with(sep))
{
return sub(0, 0);
}
return sub(0);
}
else // an empty string
{
return basic_substring();
}
}
public:
/** greedy pop left. eg, csubstr("a/b/c").gpop_left('/')="c" */
basic_substring gpop_left(C sep = C('/'), bool skip_empty=false) const
{
auto ss = pop_right(sep, skip_empty);
ss = left_of(ss);
if(ss.find(sep) != npos)
{
if(ss.ends_with(sep))
{
if(skip_empty)
{
ss = ss.trimr(sep);
}
else
{
ss = ss.sub(0, ss.len-1); // safe to subtract because ends_with(sep) is true
}
}
}
return ss;
}
/** greedy pop right. eg, csubstr("a/b/c").gpop_right('/')="a" */
basic_substring gpop_right(C sep = C('/'), bool skip_empty=false) const
{
auto ss = pop_left(sep, skip_empty);
ss = right_of(ss);
if(ss.find(sep) != npos)
{
if(ss.begins_with(sep))
{
if(skip_empty)
{
ss = ss.triml(sep);
}
else
{
ss = ss.sub(1);
}
}
}
return ss;
}
/** @} */
public:
/** @name Path-like manipulation methods */
/** @{ */
basic_substring basename(C sep=C('/')) const
{
auto ss = pop_right(sep, /*skip_empty*/true);
ss = ss.trimr(sep);
return ss;
}
basic_substring dirname(C sep=C('/')) const
{
auto ss = basename(sep);
ss = ss.empty() ? *this : left_of(ss);
return ss;
}
C4_ALWAYS_INLINE basic_substring name_wo_extshort() const
{
return gpop_left('.');
}
C4_ALWAYS_INLINE basic_substring name_wo_extlong() const
{
return pop_left('.');
}
C4_ALWAYS_INLINE basic_substring extshort() const
{
return pop_right('.');
}
C4_ALWAYS_INLINE basic_substring extlong() const
{
return gpop_right('.');
}
/** @} */
public:
/** @name Content-modification methods (only for non-const C) */
/** @{ */
/** convert the string to upper-case
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) toupper()
{
for(size_t i = 0; i < len; ++i)
{
str[i] = static_cast<C>(::toupper(str[i]));
}
}
/** convert the string to lower-case
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) tolower()
{
for(size_t i = 0; i < len; ++i)
{
str[i] = static_cast<C>(::tolower(str[i]));
}
}
public:
/** fill the entire contents with the given @p val
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) fill(C val)
{
for(size_t i = 0; i < len; ++i)
{
str[i] = val;
}
}
public:
/** set the current substring to a copy of the given csubstr
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) copy_from(ro_substr that, size_t ifirst=0, size_t num=npos)
{
C4_ASSERT(ifirst >= 0 && ifirst <= len);
num = num != npos ? num : len - ifirst;
num = num < that.len ? num : that.len;
C4_ASSERT(ifirst + num >= 0 && ifirst + num <= len);
// calling memcpy with null strings is undefined behavior
// and will wreak havoc in calling code's branches.
// see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
if(num)
memcpy(str + sizeof(C) * ifirst, that.str, sizeof(C) * num);
}
public:
/** reverse in place
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) reverse()
{
if(len == 0) return;
detail::_do_reverse(str, str + len - 1);
}
/** revert a subpart in place
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) reverse_sub(size_t ifirst, size_t num)
{
C4_ASSERT(ifirst >= 0 && ifirst <= len);
C4_ASSERT(ifirst + num >= 0 && ifirst + num <= len);
if(num == 0) return;
detail::_do_reverse(str + ifirst, str + ifirst + num - 1);
}
/** revert a range in place
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(void) reverse_range(size_t ifirst, size_t ilast)
{
C4_ASSERT(ifirst >= 0 && ifirst <= len);
C4_ASSERT(ilast >= 0 && ilast <= len);
if(ifirst == ilast) return;
detail::_do_reverse(str + ifirst, str + ilast - 1);
}
public:
/** erase part of the string. eg, with char s[] = "0123456789",
* substr(s).erase(3, 2) = "01256789", and s is now "01245678989"
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(basic_substring) erase(size_t pos, size_t num)
{
C4_ASSERT(pos >= 0 && pos+num <= len);
size_t num_to_move = len - pos - num;
memmove(str + pos, str + pos + num, sizeof(C) * num_to_move);
return basic_substring{str, len - num};
}
/** @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(basic_substring) erase_range(size_t first, size_t last)
{
C4_ASSERT(first <= last);
return erase(first, static_cast<size_t>(last-first));
}
/** erase a part of the string.
* @note @p sub must be a substring of this string
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(basic_substring) erase(ro_substr sub)
{
C4_ASSERT(is_super(sub));
C4_ASSERT(sub.str >= str);
return erase(static_cast<size_t>(sub.str - str), sub.len);
}
public:
/** replace every occurrence of character @p value with the character @p repl
* @return the number of characters that were replaced
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(size_t) replace(C value, C repl, size_t pos=0)
{
C4_ASSERT((pos >= 0 && pos <= len) || pos == npos);
size_t did_it = 0;
while((pos = find(value, pos)) != npos)
{
str[pos++] = repl;
++did_it;
}
return did_it;
}
/** replace every occurrence of each character in @p value with
* the character @p repl.
* @return the number of characters that were replaced
* @note this method requires that the string memory is writeable and is SFINAEd out for const C */
C4_REQUIRE_RW(size_t) replace(ro_substr chars, C repl, size_t pos=0)
{
C4_ASSERT((pos >= 0 && pos <= len) || pos == npos);
size_t did_it = 0;
while((pos = first_of(chars, pos)) != npos)
{
str[pos++] = repl;
++did_it;
}
return did_it;
}
/** replace @p pattern with @p repl, and write the result into
* @dst. pattern and repl don't need equal sizes.
*
* @return the required size for dst. No overflow occurs if
* dst.len is smaller than the required size; this can be used to
* determine the required size for an existing container. */
size_t replace_all(rw_substr dst, ro_substr pattern, ro_substr repl, size_t pos=0) const
{
C4_ASSERT( ! pattern.empty()); //!< @todo relax this precondition
C4_ASSERT( ! this ->overlaps(dst)); //!< @todo relax this precondition
C4_ASSERT( ! pattern.overlaps(dst));
C4_ASSERT( ! repl .overlaps(dst));
C4_ASSERT((pos >= 0 && pos <= len) || pos == npos);
C4_SUPPRESS_WARNING_GCC_PUSH
C4_SUPPRESS_WARNING_GCC("-Warray-bounds") // gcc11 has a false positive here
#if (!defined(__clang__)) && (defined(__GNUC__) && (__GNUC__ >= 7))
C4_SUPPRESS_WARNING_GCC("-Wstringop-overflow") // gcc11 has a false positive here
#endif
#define _c4append(first, last) \
{ \
C4_ASSERT((last) >= (first)); \
size_t num = static_cast<size_t>((last) - (first)); \
if(num > 0 && sz + num <= dst.len) \
{ \
memcpy(dst.str + sz, first, num * sizeof(C)); \
} \
sz += num; \
}
size_t sz = 0;
size_t b = pos;
_c4append(str, str + pos);
do {
size_t e = find(pattern, b);
if(e == npos)
{
_c4append(str + b, str + len);
break;
}
_c4append(str + b, str + e);
_c4append(repl.begin(), repl.end());
b = e + pattern.size();
} while(b < len && b != npos);
return sz;
#undef _c4append
C4_SUPPRESS_WARNING_GCC_POP
}
/** @} */
}; // template class basic_substring
#undef C4_REQUIRE_RW
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** @name Adapter functions. to_substr() and to_csubstr() is used in
* generic code like format(), and allow adding construction of
* substrings from new types like containers. */
/** @{ */
/** neutral version for use in generic code */
C4_ALWAYS_INLINE substr to_substr(substr s) noexcept { return s; }
/** neutral version for use in generic code */
C4_ALWAYS_INLINE csubstr to_csubstr(substr s) noexcept { return s; }
/** neutral version for use in generic code */
C4_ALWAYS_INLINE csubstr to_csubstr(csubstr s) noexcept { return s; }
template<size_t N>
C4_ALWAYS_INLINE substr
to_substr(char (&s)[N]) noexcept { substr ss(s, N-1); return ss; }
template<size_t N>
C4_ALWAYS_INLINE csubstr
to_csubstr(const char (&s)[N]) noexcept { csubstr ss(s, N-1); return ss; }
/** @note this overload uses SFINAE to prevent it from overriding the array overload
* @see For a more detailed explanation on why the plain overloads cannot
* coexist, see http://cplusplus.bordoon.com/specializeForCharacterArrays.html */
template<class U>
C4_ALWAYS_INLINE typename std::enable_if<std::is_same<U, char*>::value, substr>::type
to_substr(U s) noexcept { substr ss(s); return ss; }
/** @note this overload uses SFINAE to prevent it from overriding the array overload
* @see For a more detailed explanation on why the plain overloads cannot
* coexist, see http://cplusplus.bordoon.com/specializeForCharacterArrays.html */
template<class U>
C4_ALWAYS_INLINE typename std::enable_if<std::is_same<U, const char*>::value || std::is_same<U, char*>::value, csubstr>::type
to_csubstr(U s) noexcept { csubstr ss(s); return ss; }
/** @} */
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
template<typename C, size_t N> inline bool operator== (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) == 0; }
template<typename C, size_t N> inline bool operator!= (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) != 0; }
template<typename C, size_t N> inline bool operator< (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) > 0; }
template<typename C, size_t N> inline bool operator> (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) < 0; }
template<typename C, size_t N> inline bool operator<= (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) >= 0; }
template<typename C, size_t N> inline bool operator>= (const char (&s)[N], basic_substring<C> const that) noexcept { return that.compare(s, N-1) <= 0; }
template<typename C> inline bool operator== (const char c, basic_substring<C> const that) noexcept { return that.compare(c) == 0; }
template<typename C> inline bool operator!= (const char c, basic_substring<C> const that) noexcept { return that.compare(c) != 0; }
template<typename C> inline bool operator< (const char c, basic_substring<C> const that) noexcept { return that.compare(c) > 0; }
template<typename C> inline bool operator> (const char c, basic_substring<C> const that) noexcept { return that.compare(c) < 0; }
template<typename C> inline bool operator<= (const char c, basic_substring<C> const that) noexcept { return that.compare(c) >= 0; }
template<typename C> inline bool operator>= (const char c, basic_substring<C> const that) noexcept { return that.compare(c) <= 0; }
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
/** @define C4_SUBSTR_NO_OSTREAM_LSHIFT doctest does not deal well with
* template operator<<
* @see https://github.com/onqtam/doctest/pull/431 */
#ifndef C4_SUBSTR_NO_OSTREAM_LSHIFT
#ifdef __clang__
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wsign-conversion"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
/** output the string to a stream */
template<class OStream, class C>
inline OStream& operator<< (OStream& os, basic_substring<C> s)
{
os.write(s.str, s.len);
return os;
}
// this causes ambiguity
///** this is used by google test */
//template<class OStream, class C>
//inline void PrintTo(basic_substring<C> s, OStream* os)
//{
// os->write(s.str, s.len);
//}
#ifdef __clang__
# pragma clang diagnostic pop
#elif defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
#endif // !C4_SUBSTR_NO_OSTREAM_LSHIFT
} // namespace c4
#ifdef __clang__
# pragma clang diagnostic pop
#elif defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
#endif /* _C4_SUBSTR_HPP_ */
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